--- /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