+++ /dev/null
-/**\r
- ******************************************************************************\r
- * @file stm32l1xx_usart.c\r
- * @author MCD Application Team\r
- * @version V1.0.0\r
- * @date 31-December-2010\r
- * @brief This file provides firmware functions to manage the following \r
- * functionalities of the Universal synchronous asynchronous receiver\r
- * transmitter (USART): \r
- * - Initialization and Configuration\r
- * - Data transfers\r
- * - Multi-Processor Communication\r
- * - LIN mode\r
- * - Half-duplex mode\r
- * - Smartcard mode\r
- * - IrDA mode\r
- * - DMA transfers management\r
- * - Interrupts and flags management \r
- * \r
- * @verbatim\r
- * \r
- * ===================================================================\r
- * How to use this driver\r
- * ===================================================================\r
- * 1. Enable peripheral clock using RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE)\r
- * function for USART1 or using RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE)\r
- * function for USART2 and USART3.\r
- *\r
- * 2. According to the USART mode, enable the GPIO clocks using \r
- * RCC_AHBPeriphClockCmd() function. (The I/O can be TX, RX, CTS, \r
- * or and SCLK). \r
- *\r
- * 3. Peripheral\92s alternate function: \r
- * - Connect the pin to the desired peripherals' Alternate \r
- * Function (AF) using GPIO_PinAFConfig() function\r
- * - Configure the desired pin in alternate function by:\r
- * GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF\r
- * - Select the type, pull-up/pull-down and output speed via \r
- * GPIO_PuPd, GPIO_OType and GPIO_Speed members\r
- * - Call GPIO_Init() function\r
- * \r
- * 4. Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware \r
- * flow control and Mode(Receiver/Transmitter) using the SPI_Init()\r
- * function.\r
- *\r
- * 5. For synchronous mode, enable the clock and program the polarity,\r
- * phase and last bit using the USART_ClockInit() function.\r
- *\r
- * 5. Enable the NVIC and the corresponding interrupt using the function \r
- * USART_ITConfig() if you need to use interrupt mode. \r
- *\r
- * 6. When using the DMA mode \r
- * - Configure the DMA using DMA_Init() function\r
- * - Active the needed channel Request using USART_DMACmd() function\r
- * \r
- * 7. Enable the USART using the USART_Cmd() function.\r
- * \r
- * 8. Enable the DMA using the DMA_Cmd() function, when using DMA mode. \r
- *\r
- * Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections\r
- * for more details\r
- * \r
- * @endverbatim\r
- * \r
- ******************************************************************************\r
- * @attention\r
- *\r
- * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS\r
- * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE\r
- * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY\r
- * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING\r
- * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE\r
- * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.\r
- *\r
- * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>\r
- ****************************************************************************** \r
- */ \r
-\r
-/* Includes ------------------------------------------------------------------*/\r
-#include "stm32l1xx_usart.h"\r
-#include "stm32l1xx_rcc.h"\r
-\r
-/** @addtogroup STM32L1xx_StdPeriph_Driver\r
- * @{\r
- */\r
-\r
-/** @defgroup USART \r
- * @brief USART driver modules\r
- * @{\r
- */\r
-\r
-/* Private typedef -----------------------------------------------------------*/\r
-/* Private define ------------------------------------------------------------*/\r
-\r
-/*!< USART CR1 register clear Mask ((~(uint16_t)0xE9F3)) */\r
-#define CR1_CLEAR_MASK ((uint16_t)(USART_CR1_M | USART_CR1_PCE | \\r
- USART_CR1_PS | USART_CR1_TE | \\r
- USART_CR1_RE))\r
-\r
-/*!< USART CR2 register clock bits clear Mask ((~(uint16_t)0xF0FF)) */\r
-#define CR2_CLOCK_CLEAR_MASK ((uint16_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \\r
- USART_CR2_CPHA | USART_CR2_LBCL))\r
-\r
-/*!< USART CR3 register clear Mask ((~(uint16_t)0xFCFF)) */\r
-#define CR3_CLEAR_MASK ((uint16_t)(USART_CR3_RTSE | USART_CR3_CTSE))\r
-\r
-/*!< USART Interrupts mask */\r
-#define IT_MASK ((uint16_t)0x001F)\r
-\r
-/* Private macro -------------------------------------------------------------*/\r
-/* Private variables ---------------------------------------------------------*/\r
-/* Private function prototypes -----------------------------------------------*/\r
-/* Private functions ---------------------------------------------------------*/\r
-\r
-/** @defgroup USART_Private_Functions\r
- * @{\r
- */\r
-\r
-/** @defgroup USART_Group1 Initialization and Configuration functions\r
- * @brief Initialization and Configuration functions \r
- *\r
-@verbatim \r
- ===============================================================================\r
- Initialization and Configuration functions\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to initialize the USART \r
- in asynchronous and in synchronous modes.\r
- - For the asynchronous mode only these parameters can be configured: \r
- - Baud Rate\r
- - Word Length \r
- - Stop Bit\r
- - Parity: If the parity is enabled, then the MSB bit of the data written\r
- in the data register is transmitted but is changed by the parity bit.\r
- Depending on the frame length defined by the M bit (8-bits or 9-bits),\r
- the possible USART frame formats are as listed in the following table:\r
- +-------------------------------------------------------------+ \r
- | M bit | PCE bit | USART frame |\r
- |---------------------|---------------------------------------| \r
- | 0 | 0 | | SB | 8 bit data | STB | |\r
- |---------|-----------|---------------------------------------| \r
- | 0 | 1 | | SB | 7 bit data | PB | STB | |\r
- |---------|-----------|---------------------------------------| \r
- | 1 | 0 | | SB | 9 bit data | STB | |\r
- |---------|-----------|---------------------------------------| \r
- | 1 | 1 | | SB | 8 bit data | PB | STB | |\r
- +-------------------------------------------------------------+ \r
- - Hardware flow control\r
- - Receiver/transmitter modes\r
-\r
- The USART_Init() function follows the USART asynchronous configuration procedure\r
- (details for the procedure are available in reference manual (RM0038)).\r
-\r
- - For the synchronous mode in addition to the asynchronous mode parameters these \r
- parameters should be also configured:\r
- - USART Clock Enabled\r
- - USART polarity\r
- - USART phase\r
- - USART LastBit\r
- \r
- These parameters can be configured using the USART_ClockInit() function.\r
-\r
-@endverbatim\r
- * @{\r
- */\r
- \r
-/**\r
- * @brief Deinitializes the USARTx peripheral registers to their default reset values.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values: USART1, USART2 or USART3.\r
- * @retval None\r
- */\r
-void USART_DeInit(USART_TypeDef* USARTx)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
-\r
- if (USARTx == USART1)\r
- {\r
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);\r
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);\r
- }\r
- else if (USARTx == USART2)\r
- {\r
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);\r
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);\r
- }\r
- else \r
- {\r
- if (USARTx == USART3)\r
- {\r
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);\r
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE); \r
- }\r
- } \r
-}\r
-\r
-/**\r
- * @brief Initializes the USARTx peripheral according to the specified\r
- * parameters in the USART_InitStruct .\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_InitStruct: pointer to a USART_InitTypeDef structure\r
- * that contains the configuration information for the specified USART peripheral.\r
- * @retval None\r
- */\r
-void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)\r
-{\r
- uint32_t tmpreg = 0x00, apbclock = 0x00;\r
- uint32_t integerdivider = 0x00;\r
- uint32_t fractionaldivider = 0x00;\r
- RCC_ClocksTypeDef RCC_ClocksStatus;\r
-\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate)); \r
- assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));\r
- assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));\r
- assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));\r
- assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));\r
- assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));\r
- \r
-/*---------------------------- USART CR2 Configuration -----------------------*/\r
- tmpreg = USARTx->CR2;\r
- /* Clear STOP[13:12] bits */\r
- tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);\r
-\r
- /* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/\r
- /* Set STOP[13:12] bits according to USART_StopBits value */\r
- tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;\r
- \r
- /* Write to USART CR2 */\r
- USARTx->CR2 = (uint16_t)tmpreg;\r
-\r
-/*---------------------------- USART CR1 Configuration -----------------------*/\r
- tmpreg = USARTx->CR1;\r
- /* Clear M, PCE, PS, TE and RE bits */\r
- tmpreg &= (uint32_t)~((uint32_t)CR1_CLEAR_MASK);\r
-\r
- /* Configure the USART Word Length, Parity and mode ----------------------- */\r
- /* Set the M bits according to USART_WordLength value */\r
- /* Set PCE and PS bits according to USART_Parity value */\r
- /* Set TE and RE bits according to USART_Mode value */\r
- tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |\r
- USART_InitStruct->USART_Mode;\r
-\r
- /* Write to USART CR1 */\r
- USARTx->CR1 = (uint16_t)tmpreg;\r
-\r
-/*---------------------------- USART CR3 Configuration -----------------------*/ \r
- tmpreg = USARTx->CR3;\r
- /* Clear CTSE and RTSE bits */\r
- tmpreg &= (uint32_t)~((uint32_t)CR3_CLEAR_MASK);\r
-\r
- /* Configure the USART HFC -------------------------------------------------*/\r
- /* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */\r
- tmpreg |= USART_InitStruct->USART_HardwareFlowControl;\r
-\r
- /* Write to USART CR3 */\r
- USARTx->CR3 = (uint16_t)tmpreg;\r
-\r
-/*---------------------------- USART BRR Configuration -----------------------*/\r
- /* Configure the USART Baud Rate -------------------------------------------*/\r
- RCC_GetClocksFreq(&RCC_ClocksStatus);\r
- if (USARTx == USART1) \r
- {\r
- apbclock = RCC_ClocksStatus.PCLK2_Frequency;\r
- }\r
- else\r
- {\r
- apbclock = RCC_ClocksStatus.PCLK1_Frequency;\r
- }\r
-\r
- /* Determine the integer part */\r
- if ((USARTx->CR1 & USART_CR1_OVER8) != 0)\r
- {\r
- /* Integer part computing in case Oversampling mode is 8 Samples */\r
- integerdivider = ((25 * apbclock) / (2 * (USART_InitStruct->USART_BaudRate))); \r
- }\r
- else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */\r
- {\r
- /* Integer part computing in case Oversampling mode is 16 Samples */\r
- integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate))); \r
- }\r
- tmpreg = (integerdivider / 100) << 4;\r
-\r
- /* Determine the fractional part */\r
- fractionaldivider = integerdivider - (100 * (tmpreg >> 4));\r
-\r
- /* Implement the fractional part in the register */\r
- if ((USARTx->CR1 & USART_CR1_OVER8) != 0)\r
- {\r
- tmpreg |= ((((fractionaldivider * 8) + 50) / 100)) & ((uint8_t)0x07);\r
- }\r
- else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */\r
- {\r
- tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);\r
- }\r
- \r
- /* Write to USART BRR */\r
- USARTx->BRR = (uint16_t)tmpreg;\r
-}\r
-\r
-/**\r
- * @brief Fills each USART_InitStruct member with its default value.\r
- * @param USART_InitStruct: pointer to a USART_InitTypeDef structure\r
- * which will be initialized.\r
- * @retval None\r
- */\r
-void USART_StructInit(USART_InitTypeDef* USART_InitStruct)\r
-{\r
- /* USART_InitStruct members default value */\r
- USART_InitStruct->USART_BaudRate = 9600;\r
- USART_InitStruct->USART_WordLength = USART_WordLength_8b;\r
- USART_InitStruct->USART_StopBits = USART_StopBits_1;\r
- USART_InitStruct->USART_Parity = USART_Parity_No ;\r
- USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;\r
- USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None; \r
-}\r
-\r
-/**\r
- * @brief Initializes the USARTx peripheral Clock according to the \r
- * specified parameters in the USART_ClockInitStruct .\r
- * @param USARTx: where x can be 1, 2, 3 to select the USART peripheral.\r
- * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef\r
- * structure that contains the configuration information for the specified \r
- * USART peripheral. \r
- * @retval None\r
- */\r
-void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)\r
-{\r
- uint32_t tmpreg = 0x00;\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));\r
- assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));\r
- assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));\r
- assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));\r
- \r
-/*---------------------------- USART CR2 Configuration -----------------------*/\r
- tmpreg = USARTx->CR2;\r
- /* Clear CLKEN, CPOL, CPHA and LBCL bits */\r
- tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);\r
- /* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/\r
- /* Set CLKEN bit according to USART_Clock value */\r
- /* Set CPOL bit according to USART_CPOL value */\r
- /* Set CPHA bit according to USART_CPHA value */\r
- /* Set LBCL bit according to USART_LastBit value */\r
- tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL | \r
- USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;\r
- /* Write to USART CR2 */\r
- USARTx->CR2 = (uint16_t)tmpreg;\r
-}\r
-\r
-/**\r
- * @brief Fills each USART_ClockInitStruct member with its default value.\r
- * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef\r
- * structure which will be initialized.\r
- * @retval None\r
- */\r
-void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)\r
-{\r
- /* USART_ClockInitStruct members default value */\r
- USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;\r
- USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;\r
- USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;\r
- USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;\r
-}\r
-\r
-/**\r
- * @brief Enables or disables the specified USART peripheral.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param NewState: new state of the USARTx peripheral.\r
- * This parameter can be: ENABLE or DISABLE.\r
- * @retval None\r
- */\r
-void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- \r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the selected USART by setting the UE bit in the CR1 register */\r
- USARTx->CR1 |= USART_CR1_UE;\r
- }\r
- else\r
- {\r
- /* Disable the selected USART by clearing the UE bit in the CR1 register */\r
- USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_UE);\r
- }\r
-}\r
-\r
-/**\r
- * @brief Sets the system clock prescaler.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_Prescaler: specifies the prescaler clock. \r
- * @retval None\r
- */\r
-void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler)\r
-{ \r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- \r
- /* Clear the USART prescaler */\r
- USARTx->GTPR &= USART_GTPR_GT;\r
- /* Set the USART prescaler */\r
- USARTx->GTPR |= USART_Prescaler;\r
-}\r
-\r
-/**\r
- * @brief Enables or disables the USART's 8x oversampling mode.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2, USART3.\r
- * @param NewState: new state of the USART 8x oversampling mode.\r
- * This parameter can be: ENABLE or DISABLE.\r
- *\r
- * @note\r
- * This function has to be called before calling USART_Init()\r
- * function in order to have correct baudrate Divider value.\r
- * @retval : None\r
- */\r
-void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- \r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */\r
- USARTx->CR1 |= USART_CR1_OVER8;\r
- }\r
- else\r
- {\r
- /* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */\r
- USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_OVER8);\r
- }\r
-} \r
-\r
-/**\r
- * @brief Enables or disables the USART's one bit sampling method.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2, USART3.\r
- * @param NewState: new state of the USART one bit sampling method.\r
- * This parameter can be: ENABLE or DISABLE.\r
- * @retval : None\r
- */\r
-void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- \r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the one bit method by setting the ONEBITE bit in the CR3 register */\r
- USARTx->CR3 |= USART_CR3_ONEBIT;\r
- }\r
- else\r
- {\r
- /* Disable the one bit method by clearing the ONEBITE bit in the CR3 register */\r
- USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_ONEBIT);\r
- }\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup USART_Group2 Data transfers functions\r
- * @brief Data transfers functions \r
- *\r
-@verbatim \r
- ===============================================================================\r
- Data transfers functions\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to manage the USART data \r
- transfers.\r
- \r
- During an USART reception, data shifts in least significant bit first through \r
- the RX pin. In this mode, the USART_DR register consists of a buffer (RDR) \r
- between the internal bus and the received shift register.\r
-\r
- When a transmission is taking place, a write instruction to the USART_DR register \r
- stores the data in the TDR register and which is copied in the shift register \r
- at the end of the current transmission.\r
-\r
- The read access of the USART_DR register can be done using the USART_ReceiveData()\r
- function and returns the RDR buffered value. Whereas a write access to the USART_DR \r
- can be done using USART_SendData() function and stores the written data into \r
- TDR buffer.\r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Transmits single data through the USARTx peripheral.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param Data: the data to transmit.\r
- * @retval None\r
- */\r
-void USART_SendData(USART_TypeDef* USARTx, uint16_t Data)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_DATA(Data)); \r
- \r
- /* Transmit Data */\r
- USARTx->DR = (Data & (uint16_t)0x01FF);\r
-}\r
-\r
-/**\r
- * @brief Returns the most recent received data by the USARTx peripheral.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @retval The received data.\r
- */\r
-uint16_t USART_ReceiveData(USART_TypeDef* USARTx)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- \r
- /* Receive Data */\r
- return (uint16_t)(USARTx->DR & (uint16_t)0x01FF);\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup USART_Group3 MultiProcessor Communication functions\r
- * @brief Multi-Processor Communication functions \r
- *\r
-@verbatim \r
- ===============================================================================\r
- Multi-Processor Communication functions\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to manage the USART \r
- multiprocessor communication.\r
- \r
- For instance one of the USARTs can be the master, its TX output is connected to \r
- the RX input of the other USART. The others are slaves, their respective TX outputs \r
- are logically ANDed together and connected to the RX input of the master.\r
-\r
- USART multiprocessor communication is possible through the following procedure:\r
- 1. Program the Baud rate, Word length = 9 bits, Stop bits, Parity, Mode transmitter \r
- or Mode receiver and hardware flow control values using the USART_Init()\r
- function.\r
- 2. Configures the USART address using the USART_SetAddress() function.\r
- 3. Configures the wake up methode (USART_WakeUp_IdleLine or USART_WakeUp_AddressMark)\r
- using USART_WakeUpConfig() function only for the slaves.\r
- 4. Enable the USART using the USART_Cmd() function.\r
- 5. Enter the USART slaves in mute mode using USART_ReceiverWakeUpCmd() function.\r
-\r
- The USART Slave exit from mute mode when receive the wake up condition.\r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Sets the address of the USART node.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_Address: Indicates the address of the USART node.\r
- * @retval None\r
- */\r
-void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_ADDRESS(USART_Address)); \r
- \r
- /* Clear the USART address */\r
- USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_ADD);\r
- /* Set the USART address node */\r
- USARTx->CR2 |= USART_Address;\r
-}\r
-\r
-/**\r
- * @brief Determines if the USART is in mute mode or not.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param NewState: new state of the USART mute mode.\r
- * This parameter can be: ENABLE or DISABLE.\r
- * @retval None\r
- */\r
-void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState)); \r
- \r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the USART mute mode by setting the RWU bit in the CR1 register */\r
- USARTx->CR1 |= USART_CR1_RWU;\r
- }\r
- else\r
- {\r
- /* Disable the USART mute mode by clearing the RWU bit in the CR1 register */\r
- USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_RWU);\r
- }\r
-}\r
-/**\r
- * @brief Selects the USART WakeUp method.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_WakeUp: specifies the USART wakeup method.\r
- * This parameter can be one of the following values:\r
- * @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection\r
- * @arg USART_WakeUp_AddressMark: WakeUp by an address mark\r
- * @retval None\r
- */\r
-void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_WAKEUP(USART_WakeUp));\r
- \r
- USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_WAKE);\r
- USARTx->CR1 |= USART_WakeUp;\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup USART_Group4 LIN mode functions\r
- * @brief LIN mode functions \r
- *\r
-@verbatim \r
- ===============================================================================\r
- LIN mode functions\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to manage the USART LIN \r
- Mode communication.\r
- \r
- In LIN mode, 8-bit data format with 1 stop bit is required in accordance with \r
- the LIN standard.\r
-\r
- Only this LIN Feature is supported by the USART IP:\r
- - LIN Master Synchronous Break send capability and LIN slave break detection\r
- capability : 13-bit break generation and 10/11 bit break detection\r
-\r
-\r
- USART LIN Master transmitter communication is possible through the following procedure:\r
- 1. Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity, \r
- Mode transmitter or Mode receiver and hardware flow control values using \r
- the USART_Init() function.\r
- 2. Enable the USART using the USART_Cmd() function.\r
- 3. Enable the LIN mode using the USART_LINCmd() function.\r
- 4. Send the break character using USART_SendBreak() function.\r
-\r
- USART LIN Master receiver communication is possible through the following procedure:\r
- 1. Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity, \r
- Mode transmitter or Mode receiver and hardware flow control values using \r
- the USART_Init() function.\r
- 2. Enable the USART using the USART_Cmd() function.\r
- 3. Configures the break detection length using the USART_LINBreakDetectLengthConfig()\r
- function.\r
- 4. Enable the LIN mode using the USART_LINCmd() function.\r
-\r
-Note:\r
-----\r
- 1. In LIN mode, the following bits must be kept cleared:\r
- - CLKEN in the USART_CR2 register,\r
- - STOP[1:0], SCEN, HDSEL and IREN in the USART_CR3 register.\r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Sets the USART LIN Break detection length.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_LINBreakDetectLength: specifies the LIN break detection length.\r
- * This parameter can be one of the following values:\r
- * @arg USART_LINBreakDetectLength_10b: 10-bit break detection\r
- * @arg USART_LINBreakDetectLength_11b: 11-bit break detection\r
- * @retval None\r
- */\r
-void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));\r
- \r
- USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LBDL);\r
- USARTx->CR2 |= USART_LINBreakDetectLength; \r
-}\r
-\r
-/**\r
- * @brief Enables or disables the USART\92s LIN mode.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param NewState: new state of the USART LIN mode.\r
- * This parameter can be: ENABLE or DISABLE.\r
- * @retval None\r
- */\r
-void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- \r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the LIN mode by setting the LINEN bit in the CR2 register */\r
- USARTx->CR2 |= USART_CR2_LINEN;\r
- }\r
- else\r
- {\r
- /* Disable the LIN mode by clearing the LINEN bit in the CR2 register */\r
- USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LINEN);\r
- }\r
-}\r
-\r
-/**\r
- * @brief Transmits break characters.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @retval None\r
- */\r
-void USART_SendBreak(USART_TypeDef* USARTx)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- \r
- /* Send break characters */\r
- USARTx->CR1 |= USART_CR1_SBK;\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup USART_Group5 Halfduplex mode function\r
- * @brief Half-duplex mode function \r
- *\r
-@verbatim \r
- ===============================================================================\r
- Half-duplex mode function\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to manage the USART \r
- Half-duplex communication.\r
- \r
- The USART can be configured to follow a single-wire half-duplex protocol where \r
- the TX and RX lines are internally connected.\r
-\r
- USART Half duplex communication is possible through the following procedure:\r
- 1. Program the Baud rate, Word length, Stop bits, Parity, Mode transmitter \r
- or Mode receiver and hardware flow control values using the USART_Init()\r
- function.\r
- 2. Configures the USART address using the USART_SetAddress() function.\r
- 3. Enable the USART using the USART_Cmd() function.\r
- 4. Enable the half duplex mode using USART_HalfDuplexCmd() function.\r
-\r
-Note:\r
-----\r
- 1. The RX pin is no longer used\r
- 2. In Half-duplex mode the following bits must be kept cleared:\r
- - LINEN and CLKEN bits in the USART_CR2 register.\r
- - SCEN and IREN bits in the USART_CR3 register.\r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Enables or disables the USART\92s Half Duplex communication.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param NewState: new state of the USART Communication.\r
- * This parameter can be: ENABLE or DISABLE.\r
- * @retval None\r
- */\r
-void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- \r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */\r
- USARTx->CR3 |= USART_CR3_HDSEL;\r
- }\r
- else\r
- {\r
- /* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */\r
- USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_HDSEL);\r
- }\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-\r
-/** @defgroup USART_Group6 Smartcard mode functions\r
- * @brief Smartcard mode functions \r
- *\r
-@verbatim \r
- ===============================================================================\r
- Smartcard mode functions\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to manage the USART \r
- Smartcard communication.\r
- \r
- The Smartcard interface is designed to support asynchronous protocol Smartcards as\r
- defined in the ISO 7816-3 standard.\r
-\r
- The USART can provide a clock to the smartcard through the SCLK output.\r
- In smartcard mode, SCLK is not associated to the communication but is simply derived \r
- from the internal peripheral input clock through a 5-bit prescaler.\r
-\r
- Smartcard communication is possible through the following procedure:\r
- 1. Configures the Smartcard Prsecaler using the USART_SetPrescaler() function.\r
- 2. Configures the Smartcard Guard Time using the USART_SetGuardTime() function.\r
- 3. Program the USART clock using the USART_ClockInit() function as following:\r
- - USART Clock enabled\r
- - USART CPOL Low\r
- - USART CPHA on first edge\r
- - USART Last Bit Clock Enabled\r
- 4. Program the Smartcard interface using the USART_Init() function as following:\r
- - Word Length = 9 Bits\r
- - 1.5 Stop Bit\r
- - Even parity\r
- - BaudRate = 12096 baud\r
- - Hardware flow control disabled (RTS and CTS signals)\r
- - Tx and Rx enabled\r
- 5. Optionally you can enable the parity error interrupt using the USART_ITConfig()\r
- function\r
- 6. Enable the USART using the USART_Cmd() function.\r
- 7. Enable the Smartcard NACK using the USART_SmartCardNACKCmd() function.\r
- 8. Enable the Smartcard interface using the USART_SmartCardCmd() function.\r
-\r
- Please refer to the ISO 7816-3 specification for more details.\r
-\r
-Note: \r
------\r
- 1. It is also possible to choose 0.5 stop bit for receiving but it is recommended \r
- to use 1.5 stop bits for both transmitting and receiving to avoid switching \r
- between the two configurations.\r
- 2. In smartcard mode, the following bits must be kept cleared:\r
- - LINEN bit in the USART_CR2 register.\r
- - HDSEL and IREN bits in the USART_CR3 register.\r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Sets the specified USART guard time.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_GuardTime: specifies the guard time. \r
- * @retval None\r
- */\r
-void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime)\r
-{ \r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- \r
- /* Clear the USART Guard time */\r
- USARTx->GTPR &= USART_GTPR_PSC;\r
- /* Set the USART guard time */\r
- USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);\r
-}\r
-\r
-/**\r
- * @brief Enables or disables the USART\92s Smart Card mode.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param NewState: new state of the Smart Card mode.\r
- * This parameter can be: ENABLE or DISABLE. \r
- * @retval None\r
- */\r
-void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the SC mode by setting the SCEN bit in the CR3 register */\r
- USARTx->CR3 |= USART_CR3_SCEN;\r
- }\r
- else\r
- {\r
- /* Disable the SC mode by clearing the SCEN bit in the CR3 register */\r
- USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_SCEN);\r
- }\r
-}\r
-\r
-/**\r
- * @brief Enables or disables NACK transmission.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param NewState: new state of the NACK transmission.\r
- * This parameter can be: ENABLE or DISABLE. \r
- * @retval None\r
- */\r
-void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx)); \r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the NACK transmission by setting the NACK bit in the CR3 register */\r
- USARTx->CR3 |= USART_CR3_NACK;\r
- }\r
- else\r
- {\r
- /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */\r
- USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_NACK);\r
- }\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup USART_Group7 IrDA mode functions\r
- * @brief IrDA mode functions \r
- *\r
-@verbatim \r
- ===============================================================================\r
- IrDA mode functions\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to manage the USART \r
- IrDA communication.\r
- \r
- IrDA is a half duplex communication protocol. If the Transmitter is busy, any data\r
- on the IrDA receive line will be ignored by the IrDA decoder and if the Receiver \r
- is busy, data on the TX from the USART to IrDA will not be encoded by IrDA.\r
- While receiving data, transmission should be avoided as the data to be transmitted\r
- could be corrupted.\r
-\r
- IrDA communication is possible through the following procedure:\r
- 1. Program the Baud rate, Word length = 8 bits, Stop bits, Parity, Transmitter/Receiver \r
- modes and hardware flow control values using the USART_Init() function.\r
- 2. Enable the USART using the USART_Cmd() function.\r
- 3. Configures the IrDA pulse width by configuring the prescaler using \r
- the USART_SetPrescaler() function.\r
- 4. Configures the IrDA USART_IrDAMode_LowPower or USART_IrDAMode_Normal mode\r
- using the USART_IrDAConfig() function.\r
- 5. Enable the IrDA using the USART_IrDACmd() function.\r
-\r
-Note: \r
------\r
- 1. A pulse of width less than two and greater than one PSC period(s) may or may\r
- not be rejected.\r
- 2. The receiver set up time should be managed by software. The IrDA physical layer\r
- specification specifies a minimum of 10 ms delay between transmission and \r
- reception (IrDA is a half duplex protocol).\r
- 3. In IrDA mode, the following bits must be kept cleared:\r
- - LINEN, STOP and CLKEN bits in the USART_CR2 register.\r
- - SCEN and HDSEL bits in the USART_CR3 register.\r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Configures the USART\92s IrDA interface.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_IrDAMode: specifies the IrDA mode.\r
- * This parameter can be one of the following values:\r
- * @arg USART_IrDAMode_LowPower\r
- * @arg USART_IrDAMode_Normal\r
- * @retval None\r
- */\r
-void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));\r
- \r
- USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IRLP);\r
- USARTx->CR3 |= USART_IrDAMode;\r
-}\r
-\r
-/**\r
- * @brief Enables or disables the USART\92s IrDA interface.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param NewState: new state of the IrDA mode.\r
- * This parameter can be: ENABLE or DISABLE.\r
- * @retval None\r
- */\r
-void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- \r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the IrDA mode by setting the IREN bit in the CR3 register */\r
- USARTx->CR3 |= USART_CR3_IREN;\r
- }\r
- else\r
- {\r
- /* Disable the IrDA mode by clearing the IREN bit in the CR3 register */\r
- USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IREN);\r
- }\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/** @defgroup USART_Group8 DMA transfers management functions\r
- * @brief DMA transfers management functions\r
- *\r
-@verbatim \r
- ===============================================================================\r
- DMA transfers management functions\r
- =============================================================================== \r
-\r
-@endverbatim\r
- * @{\r
- */\r
- \r
-/**\r
- * @brief Enables or disables the USART\92s DMA interface.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_DMAReq: specifies the DMA request.\r
- * This parameter can be any combination of the following values:\r
- * @arg USART_DMAReq_Tx: USART DMA transmit request\r
- * @arg USART_DMAReq_Rx: USART DMA receive request\r
- * @param NewState: new state of the DMA Request sources.\r
- * This parameter can be: ENABLE or DISABLE. \r
- * @retval None\r
- */\r
-void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_DMAREQ(USART_DMAReq)); \r
- assert_param(IS_FUNCTIONAL_STATE(NewState)); \r
-\r
- if (NewState != DISABLE)\r
- {\r
- /* Enable the DMA transfer for selected requests by setting the DMAT and/or\r
- DMAR bits in the USART CR3 register */\r
- USARTx->CR3 |= USART_DMAReq;\r
- }\r
- else\r
- {\r
- /* Disable the DMA transfer for selected requests by clearing the DMAT and/or\r
- DMAR bits in the USART CR3 register */\r
- USARTx->CR3 &= (uint16_t)~USART_DMAReq;\r
- }\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
- \r
-/** @defgroup USART_Group9 Interrupts and flags management functions\r
- * @brief Interrupts and flags management functions \r
- *\r
-@verbatim \r
- ===============================================================================\r
- Interrupts and flags management functions\r
- =============================================================================== \r
-\r
- This subsection provides a set of functions allowing to configure the USART \r
- Interrupts sources, DMA channels requests and check or clear the flags or \r
- pending bits status.\r
- The user should identify which mode will be used in his application to manage \r
- the communication: Polling mode, Interrupt mode or DMA mode. \r
- \r
- Polling Mode\r
- =============\r
- In Polling Mode, the SPI communication can be managed by 10 flags:\r
- 1. USART_FLAG_TXE : to indicate the status of the transmit buffer register\r
- 2. USART_FLAG_RXNE : to indicate the status of the receive buffer register\r
- 3. USART_FLAG_TC : to indicate the status of the transmit operation\r
- 4. USART_FLAG_IDLE : to indicate the status of the Idle Line \r
- 5. USART_FLAG_CTS : to indicate the status of the nCTS input\r
- 6. USART_FLAG_LBD : to indicate the status of the LIN break detection\r
- 7. USART_FLAG_NE : to indicate if a noise error occur\r
- 8. USART_FLAG_FE : to indicate if a frame error occur\r
- 9. USART_FLAG_PE : to indicate if a parity error occur\r
- 10. USART_FLAG_ORE : to indicate if an Overrun error occur\r
-\r
- In this Mode it is advised to use the following functions:\r
- - FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);\r
- - void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);\r
-\r
- Interrupt Mode\r
- ===============\r
- In Interrupt Mode, the USART communication can be managed by 8 interrupt sources\r
- and 10 pending bits: \r
-\r
- Pending Bits:\r
- ------------- \r
- 1. USART_IT_TXE : to indicate the status of the transmit buffer register\r
- 2. USART_IT_RXNE : to indicate the status of the receive buffer register\r
- 3. USART_IT_TC : to indicate the status of the transmit operation\r
- 4. USART_IT_IDLE : to indicate the status of the Idle Line \r
- 5. USART_IT_CTS : to indicate the status of the nCTS input\r
- 6. USART_IT_LBD : to indicate the status of the LIN break detection\r
- 7. USART_IT_NE : to indicate if a noise error occur\r
- 8. USART_IT_FE : to indicate if a frame error occur\r
- 9. USART_IT_PE : to indicate if a parity error occur\r
- 10. USART_IT_ORE : to indicate if an Overrun error occur\r
-\r
- Interrupt Source:\r
- -----------------\r
- 1. USART_IT_TXE : specifies the interrupt source for the Tx buffer empty \r
- interrupt. \r
- 2. USART_IT_RXNE : specifies the interrupt source for the Rx buffer not \r
- empty interrupt.\r
- 3. USART_IT_TC : specifies the interrupt source for the Transmit complete \r
- interrupt. \r
- 4. USART_IT_IDLE : specifies the interrupt source for the Idle Line interrupt. \r
- 5. USART_IT_CTS : specifies the interrupt source for the CTS interrupt. \r
- 6. USART_IT_LBD : specifies the interrupt source for the LIN break detection\r
- interrupt. \r
- 7. USART_IT_PE : specifies the interrupt source for theparity error interrupt. \r
- 8. USART_IT_ERR : specifies the interrupt source for the errors interrupt.\r
-\r
- Note: Some parameters are coded in order to use them as interrupt source or \r
- ---- as pending bits.\r
-\r
- In this Mode it is advised to use the following functions:\r
- - void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);\r
- - ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);\r
- - void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);\r
-\r
- DMA Mode\r
- ========\r
- In DMA Mode, the USART communication can be managed by 2 DMA Channel requests:\r
- 1. USART_DMAReq_Tx: specifies the Tx buffer DMA transfer request\r
- 2. USART_DMAReq_Rx: specifies the Rx buffer DMA transfer request\r
-\r
- In this Mode it is advised to use the following function:\r
- - void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);\r
-\r
-@endverbatim\r
- * @{\r
- */\r
-\r
-/**\r
- * @brief Enables or disables the specified USART interrupts.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_IT: specifies the USART interrupt sources to be enabled or disabled.\r
- * This parameter can be one of the following values:\r
- * @arg USART_IT_CTS: CTS change interrupt\r
- * @arg USART_IT_LBD: LIN Break detection interrupt\r
- * @arg USART_IT_TXE: Tansmit Data Register empty interrupt\r
- * @arg USART_IT_TC: Transmission complete interrupt\r
- * @arg USART_IT_RXNE: Receive Data register not empty interrupt\r
- * @arg USART_IT_IDLE: Idle line detection interrupt\r
- * @arg USART_IT_PE: Parity Error interrupt\r
- * @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)\r
- * @param NewState: new state of the specified USARTx interrupts.\r
- * This parameter can be: ENABLE or DISABLE.\r
- * @retval None\r
- */\r
-void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState)\r
-{\r
- uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;\r
- uint32_t usartxbase = 0x00;\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_CONFIG_IT(USART_IT));\r
- assert_param(IS_FUNCTIONAL_STATE(NewState));\r
- \r
- usartxbase = (uint32_t)USARTx;\r
-\r
- /* Get the USART register index */\r
- usartreg = (((uint8_t)USART_IT) >> 0x05);\r
-\r
- /* Get the interrupt position */\r
- itpos = USART_IT & IT_MASK;\r
- itmask = (((uint32_t)0x01) << itpos);\r
- \r
- if (usartreg == 0x01) /* The IT is in CR1 register */\r
- {\r
- usartxbase += 0x0C;\r
- }\r
- else if (usartreg == 0x02) /* The IT is in CR2 register */\r
- {\r
- usartxbase += 0x10;\r
- }\r
- else /* The IT is in CR3 register */\r
- {\r
- usartxbase += 0x14; \r
- }\r
- if (NewState != DISABLE)\r
- {\r
- *(__IO uint32_t*)usartxbase |= itmask;\r
- }\r
- else\r
- {\r
- *(__IO uint32_t*)usartxbase &= ~itmask;\r
- }\r
-}\r
-\r
-/**\r
- * @brief Checks whether the specified USART flag is set or not.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_FLAG: specifies the flag to check.\r
- * This parameter can be one of the following values:\r
- * @arg USART_FLAG_CTS: CTS Change flag\r
- * @arg USART_FLAG_LBD: LIN Break detection flag\r
- * @arg USART_FLAG_TXE: Transmit data register empty flag\r
- * @arg USART_FLAG_TC: Transmission Complete flag\r
- * @arg USART_FLAG_RXNE: Receive data register not empty flag\r
- * @arg USART_FLAG_IDLE: Idle Line detection flag\r
- * @arg USART_FLAG_ORE: OverRun Error flag\r
- * @arg USART_FLAG_NE: Noise Error flag\r
- * @arg USART_FLAG_FE: Framing Error flag\r
- * @arg USART_FLAG_PE: Parity Error flag\r
- * @retval The new state of USART_FLAG (SET or RESET).\r
- */\r
-FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG)\r
-{\r
- FlagStatus bitstatus = RESET;\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_FLAG(USART_FLAG));\r
- \r
- if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET)\r
- {\r
- bitstatus = SET;\r
- }\r
- else\r
- {\r
- bitstatus = RESET;\r
- }\r
- return bitstatus;\r
-}\r
-\r
-/**\r
- * @brief Clears the USARTx's pending flags.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_FLAG: specifies the flag to clear.\r
- * This parameter can be any combination of the following values:\r
- * @arg USART_FLAG_CTS: CTS Change flag.\r
- * @arg USART_FLAG_LBD: LIN Break detection flag.\r
- * @arg USART_FLAG_TC: Transmission Complete flag.\r
- * @arg USART_FLAG_RXNE: Receive data register not empty flag.\r
- * \r
- * @note\r
- * - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun \r
- * error) and IDLE (Idle line detected) flags are cleared by software \r
- * sequence: a read operation to USART_SR register (USART_GetFlagStatus()) \r
- * followed by a read operation to USART_DR register (USART_ReceiveData()).\r
- * - RXNE flag can be also cleared by a read to the USART_DR register \r
- * (USART_ReceiveData()).\r
- * - TC flag can be also cleared by software sequence: a read operation to \r
- * USART_SR register (USART_GetFlagStatus()) followed by a write operation\r
- * to USART_DR register (USART_SendData()).\r
- * - TXE flag is cleared only by a write to the USART_DR register \r
- * (USART_SendData()).\r
- * @retval None\r
- */\r
-void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG)\r
-{\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));\r
- \r
- USARTx->SR = (uint16_t)~USART_FLAG;\r
-}\r
-\r
-/**\r
- * @brief Checks whether the specified USART interrupt has occurred or not.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_IT: specifies the USART interrupt source to check.\r
- * This parameter can be one of the following values:\r
- * @arg USART_IT_CTS: CTS change interrupt\r
- * @arg USART_IT_LBD: LIN Break detection interrupt\r
- * @arg USART_IT_TXE: Tansmit Data Register empty interrupt\r
- * @arg USART_IT_TC: Transmission complete interrupt\r
- * @arg USART_IT_RXNE: Receive Data register not empty interrupt\r
- * @arg USART_IT_IDLE: Idle line detection interrupt\r
- * @arg USART_IT_ORE: OverRun Error interrupt\r
- * @arg USART_IT_NE: Noise Error interrupt\r
- * @arg USART_IT_FE: Framing Error interrupt\r
- * @arg USART_IT_PE: Parity Error interrupt\r
- * @retval The new state of USART_IT (SET or RESET).\r
- */\r
-ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)\r
-{\r
- uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;\r
- ITStatus bitstatus = RESET;\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_GET_IT(USART_IT)); \r
- \r
- /* Get the USART register index */\r
- usartreg = (((uint8_t)USART_IT) >> 0x05);\r
- /* Get the interrupt position */\r
- itmask = USART_IT & IT_MASK;\r
- itmask = (uint32_t)0x01 << itmask;\r
- \r
- if (usartreg == 0x01) /* The IT is in CR1 register */\r
- {\r
- itmask &= USARTx->CR1;\r
- }\r
- else if (usartreg == 0x02) /* The IT is in CR2 register */\r
- {\r
- itmask &= USARTx->CR2;\r
- }\r
- else /* The IT is in CR3 register */\r
- {\r
- itmask &= USARTx->CR3;\r
- }\r
- \r
- bitpos = USART_IT >> 0x08;\r
- bitpos = (uint32_t)0x01 << bitpos;\r
- bitpos &= USARTx->SR;\r
- if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))\r
- {\r
- bitstatus = SET;\r
- }\r
- else\r
- {\r
- bitstatus = RESET;\r
- }\r
- \r
- return bitstatus; \r
-}\r
-\r
-/**\r
- * @brief Clears the USARTx\92s interrupt pending bits.\r
- * @param USARTx: Select the USART peripheral. \r
- * This parameter can be one of the following values:\r
- * USART1, USART2 or USART3.\r
- * @param USART_IT: specifies the interrupt pending bit to clear.\r
- * This parameter can be one of the following values:\r
- * @arg USART_IT_CTS: CTS change interrupt\r
- * @arg USART_IT_LBD: LIN Break detection interrupt\r
- * @arg USART_IT_TC: Transmission complete interrupt. \r
- * @arg USART_IT_RXNE: Receive Data register not empty interrupt.\r
- * \r
- * @note\r
- * - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun \r
- * error) and IDLE (Idle line detected) pending bits are cleared by \r
- * software sequence: a read operation to USART_SR register \r
- * (USART_GetITStatus()) followed by a read operation to USART_DR register \r
- * (USART_ReceiveData()).\r
- * - RXNE pending bit can be also cleared by a read to the USART_DR register \r
- * (USART_ReceiveData()).\r
- * - TC pending bit can be also cleared by software sequence: a read \r
- * operation to USART_SR register (USART_GetITStatus()) followed by a write \r
- * operation to USART_DR register (USART_SendData()).\r
- * - TXE pending bit is cleared only by a write to the USART_DR register \r
- * (USART_SendData()).\r
- * @retval None\r
- */\r
-void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)\r
-{\r
- uint16_t bitpos = 0x00, itmask = 0x00;\r
- /* Check the parameters */\r
- assert_param(IS_USART_ALL_PERIPH(USARTx));\r
- assert_param(IS_USART_CLEAR_IT(USART_IT)); \r
- \r
- bitpos = USART_IT >> 0x08;\r
- itmask = ((uint16_t)0x01 << (uint16_t)bitpos);\r
- USARTx->SR = (uint16_t)~itmask;\r
-}\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/**\r
- * @}\r
- */\r
-\r
-/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/\r
projects / fw / stlink / blobdiff