--- /dev/null
+/**\r
+ ******************************************************************************\r
+ * @file stm32l1xx_i2c.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 Inter-integrated circuit (I2C)\r
+ * - Initialization and Configuration\r
+ * - Data transfers\r
+ * - PEC management\r
+ * - DMA transfers management\r
+ * - Interrupts, events and flags management \r
+ * \r
+ * @verbatim\r
+ * \r
+ * ===================================================================\r
+ * How to use this driver\r
+ * ===================================================================\r
+ * 1. Enable peripheral clock using RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2Cx, ENABLE)\r
+ * function for I2C1 or I2C2.\r
+ *\r
+ * 2. Enable SDA, SCL and SMBA (when used) GPIO clocks using \r
+ * RCC_AHBPeriphClockCmd() function. \r
+ *\r
+ * 3. Peripherals 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 Mode, duty cycle , Own address, Ack, Speed and Acknowledged\r
+ * Address using the I2C_Init() function.\r
+ *\r
+ * 5. Optionally you can enable/configure the following parameters without\r
+ * re-initialization (i.e there is no need to call again I2C_Init() function):\r
+ * - Enable the acknowledge feature using I2C_AcknowledgeConfig() function\r
+ * - Enable the dual addressing mode using I2C_DualAddressCmd() function\r
+ * - Enable the general call using the I2C_GeneralCallCmd() function\r
+ * - Enable the clock stretching using I2C_StretchClockCmd() function\r
+ * - Enable the fast mode duty cycle using the I2C_FastModeDutyCycleConfig()\r
+ * function\r
+ * - Enable the PEC Calculation using I2C_CalculatePEC() function\r
+ * - For SMBus Mode: \r
+ * - Enable the Address Resolution Protocol (ARP) using I2C_ARPCmd() function\r
+ * - Configure the SMBusAlert pin using I2C_SMBusAlertConfig() function\r
+ *\r
+ * 6. Enable the NVIC and the corresponding interrupt using the function \r
+ * I2C_ITConfig() if you need to use interrupt mode. \r
+ *\r
+ * 7. When using the DMA mode \r
+ * - Configure the DMA using DMA_Init() function\r
+ * - Active the needed channel Request using I2C_DMACmd() or\r
+ I2C_DMALastTransferCmd() function\r
+ * \r
+ * 8. Enable the I2C using the I2C_Cmd() function.\r
+ * \r
+ * 9. Enable the DMA using the DMA_Cmd() function when using DMA mode in the \r
+ * transfers. \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_i2c.h"\r
+#include "stm32l1xx_rcc.h"\r
+\r
+\r
+/** @addtogroup STM32L1xx_StdPeriph_Driver\r
+ * @{\r
+ */\r
+\r
+/** @defgroup I2C \r
+ * @brief I2C driver modules\r
+ * @{\r
+ */ \r
+\r
+/* Private typedef -----------------------------------------------------------*/\r
+/* Private define ------------------------------------------------------------*/\r
+\r
+#define CR1_CLEAR_MASK ((uint16_t)0xFBF5) /*<! I2C registers Masks */\r
+#define FLAG_MASK ((uint32_t)0x00FFFFFF) /*<! I2C FLAG mask */\r
+#define ITEN_MASK ((uint32_t)0x07000000) /*<! I2C Interrupt Enable mask */\r
+\r
+/* Private macro -------------------------------------------------------------*/\r
+/* Private variables ---------------------------------------------------------*/\r
+/* Private function prototypes -----------------------------------------------*/\r
+/* Private functions ---------------------------------------------------------*/\r
+\r
+/** @defgroup I2C_Private_Functions\r
+ * @{\r
+ */\r
+\r
+/** @defgroup I2C_Group1 Initialization and Configuration functions\r
+ * @brief Initialization and Configuration functions \r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ Initialization and Configuration functions\r
+ =============================================================================== \r
+\r
+@endverbatim\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Deinitializes the I2Cx peripheral registers to their default reset values.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @retval None\r
+ */\r
+void I2C_DeInit(I2C_TypeDef* I2Cx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+\r
+ if (I2Cx == I2C1)\r
+ {\r
+ /* Enable I2C1 reset state */\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);\r
+ /* Release I2C1 from reset state */\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);\r
+ }\r
+ else\r
+ {\r
+ /* Enable I2C2 reset state */\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);\r
+ /* Release I2C2 from reset state */\r
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Initializes the I2Cx peripheral according to the specified \r
+ * parameters in the I2C_InitStruct.\r
+ * @note To use the I2C at 400 KHz (in fast mode), the PCLK1 frequency \r
+ * (I2C peripheral input clock) must be a multiple of 10 MHz. \r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_InitStruct: pointer to a I2C_InitTypeDef structure that\r
+ * contains the configuration information for the specified I2C peripheral.\r
+ * @retval None\r
+ */\r
+void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)\r
+{\r
+ uint16_t tmpreg = 0, freqrange = 0;\r
+ uint16_t result = 0x04;\r
+ uint32_t pclk1 = 8000000;\r
+ RCC_ClocksTypeDef rcc_clocks;\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));\r
+ assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));\r
+ assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));\r
+ assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));\r
+ assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));\r
+ assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));\r
+\r
+/*---------------------------- I2Cx CR2 Configuration ------------------------*/\r
+ /* Get the I2Cx CR2 value */\r
+ tmpreg = I2Cx->CR2;\r
+ /* Clear frequency FREQ[5:0] bits */\r
+ tmpreg &= (uint16_t)~((uint16_t)I2C_CR2_FREQ);\r
+ /* Get pclk1 frequency value */\r
+ RCC_GetClocksFreq(&rcc_clocks);\r
+ pclk1 = rcc_clocks.PCLK1_Frequency;\r
+ /* Set frequency bits depending on pclk1 value */\r
+ freqrange = (uint16_t)(pclk1 / 1000000);\r
+ tmpreg |= freqrange;\r
+ /* Write to I2Cx CR2 */\r
+ I2Cx->CR2 = tmpreg;\r
+\r
+/*---------------------------- I2Cx CCR Configuration ------------------------*/\r
+ /* Disable the selected I2C peripheral to configure TRISE */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PE);\r
+ /* Reset tmpreg value */\r
+ /* Clear F/S, DUTY and CCR[11:0] bits */\r
+ tmpreg = 0;\r
+\r
+ /* Configure speed in standard mode */\r
+ if (I2C_InitStruct->I2C_ClockSpeed <= 100000)\r
+ {\r
+ /* Standard mode speed calculate */\r
+ result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));\r
+ /* Test if CCR value is under 0x4*/\r
+ if (result < 0x04)\r
+ {\r
+ /* Set minimum allowed value */\r
+ result = 0x04; \r
+ }\r
+ /* Set speed value for standard mode */\r
+ tmpreg |= result; \r
+ /* Set Maximum Rise Time for standard mode */\r
+ I2Cx->TRISE = freqrange + 1; \r
+ }\r
+ /* Configure speed in fast mode */\r
+ /* To use the I2C at 400 KHz (in fast mode), the PCLK1 frequency (I2C peripheral\r
+ input clock) must be a multiple of 10 MHz */\r
+ else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/\r
+ {\r
+ if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)\r
+ {\r
+ /* Fast mode speed calculate: Tlow/Thigh = 2 */\r
+ result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));\r
+ }\r
+ else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/\r
+ {\r
+ /* Fast mode speed calculate: Tlow/Thigh = 16/9 */\r
+ result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));\r
+ /* Set DUTY bit */\r
+ result |= I2C_DutyCycle_16_9;\r
+ }\r
+\r
+ /* Test if CCR value is under 0x1*/\r
+ if ((result & I2C_CCR_CCR) == 0)\r
+ {\r
+ /* Set minimum allowed value */\r
+ result |= (uint16_t)0x0001; \r
+ }\r
+ /* Set speed value and set F/S bit for fast mode */\r
+ tmpreg |= (uint16_t)(result | I2C_CCR_FS);\r
+ /* Set Maximum Rise Time for fast mode */\r
+ I2Cx->TRISE = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1); \r
+ }\r
+\r
+ /* Write to I2Cx CCR */\r
+ I2Cx->CCR = tmpreg;\r
+ /* Enable the selected I2C peripheral */\r
+ I2Cx->CR1 |= I2C_CR1_PE;\r
+\r
+/*---------------------------- I2Cx CR1 Configuration ------------------------*/\r
+ /* Get the I2Cx CR1 value */\r
+ tmpreg = I2Cx->CR1;\r
+ /* Clear ACK, SMBTYPE and SMBUS bits */\r
+ tmpreg &= CR1_CLEAR_MASK;\r
+ /* Configure I2Cx: mode and acknowledgement */\r
+ /* Set SMBTYPE and SMBUS bits according to I2C_Mode value */\r
+ /* Set ACK bit according to I2C_Ack value */\r
+ tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);\r
+ /* Write to I2Cx CR1 */\r
+ I2Cx->CR1 = tmpreg;\r
+\r
+/*---------------------------- I2Cx OAR1 Configuration -----------------------*/\r
+ /* Set I2Cx Own Address1 and acknowledged address */\r
+ I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);\r
+}\r
+\r
+/**\r
+ * @brief Fills each I2C_InitStruct member with its default value.\r
+ * @param I2C_InitStruct: pointer to an I2C_InitTypeDef structure which will be initialized.\r
+ * @retval None\r
+ */\r
+void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)\r
+{\r
+/*---------------- Reset I2C init structure parameters values ----------------*/\r
+ /* initialize the I2C_ClockSpeed member */\r
+ I2C_InitStruct->I2C_ClockSpeed = 5000;\r
+ /* Initialize the I2C_Mode member */\r
+ I2C_InitStruct->I2C_Mode = I2C_Mode_I2C;\r
+ /* Initialize the I2C_DutyCycle member */\r
+ I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2;\r
+ /* Initialize the I2C_OwnAddress1 member */\r
+ I2C_InitStruct->I2C_OwnAddress1 = 0;\r
+ /* Initialize the I2C_Ack member */\r
+ I2C_InitStruct->I2C_Ack = I2C_Ack_Disable;\r
+ /* Initialize the I2C_AcknowledgedAddress member */\r
+ I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C peripheral.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2Cx peripheral. \r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the selected I2C peripheral */\r
+ I2Cx->CR1 |= I2C_CR1_PE;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected I2C peripheral */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PE);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Generates I2Cx communication START condition.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C START condition generation.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None.\r
+ */\r
+void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Generate a START condition */\r
+ I2Cx->CR1 |= I2C_CR1_START;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the START condition generation */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_START);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Generates I2Cx communication STOP condition.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C STOP condition generation.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None.\r
+ */\r
+void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Generate a STOP condition */\r
+ I2Cx->CR1 |= I2C_CR1_STOP;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the STOP condition generation */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_STOP);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C acknowledge feature.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C Acknowledgement.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None.\r
+ */\r
+void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the acknowledgement */\r
+ I2Cx->CR1 |= I2C_CR1_ACK;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the acknowledgement */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ACK);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Configures the specified I2C own address2.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param Address: specifies the 7bit I2C own address2.\r
+ * @retval None.\r
+ */\r
+void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address)\r
+{\r
+ uint16_t tmpreg = 0;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+\r
+ /* Get the old register value */\r
+ tmpreg = I2Cx->OAR2;\r
+\r
+ /* Reset I2Cx Own address2 bit [7:1] */\r
+ tmpreg &= (uint16_t)~((uint16_t)I2C_OAR2_ADD2);\r
+\r
+ /* Set I2Cx Own address2 */\r
+ tmpreg |= (uint16_t)((uint16_t)Address & (uint16_t)0x00FE);\r
+\r
+ /* Store the new register value */\r
+ I2Cx->OAR2 = tmpreg;\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C dual addressing mode.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C dual addressing mode.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable dual addressing mode */\r
+ I2Cx->OAR2 |= I2C_OAR2_ENDUAL;\r
+ }\r
+ else\r
+ {\r
+ /* Disable dual addressing mode */\r
+ I2Cx->OAR2 &= (uint16_t)~((uint16_t)I2C_OAR2_ENDUAL);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C general call feature.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C General call.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable generall call */\r
+ I2Cx->CR1 |= I2C_CR1_ENGC;\r
+ }\r
+ else\r
+ {\r
+ /* Disable generall call */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENGC);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C software reset.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C software reset.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Peripheral under reset */\r
+ I2Cx->CR1 |= I2C_CR1_SWRST;\r
+ }\r
+ else\r
+ {\r
+ /* Peripheral not under reset */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_SWRST);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Drives the SMBusAlert pin high or low for the specified I2C.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_SMBusAlert: specifies SMBAlert pin level. \r
+ * This parameter can be one of the following values:\r
+ * @arg I2C_SMBusAlert_Low: SMBAlert pin driven low\r
+ * @arg I2C_SMBusAlert_High: SMBAlert pin driven high\r
+ * @retval None\r
+ */\r
+void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert));\r
+ if (I2C_SMBusAlert == I2C_SMBusAlert_Low)\r
+ {\r
+ /* Drive the SMBusAlert pin Low */\r
+ I2Cx->CR1 |= I2C_SMBusAlert_Low;\r
+ }\r
+ else\r
+ {\r
+ /* Drive the SMBusAlert pin High */\r
+ I2Cx->CR1 &= I2C_SMBusAlert_High;\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C ARP.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2Cx ARP. \r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the selected I2C ARP */\r
+ I2Cx->CR1 |= I2C_CR1_ENARP;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected I2C ARP */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENARP);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C Clock stretching.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2Cx Clock stretching.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState == DISABLE)\r
+ {\r
+ /* Enable the selected I2C Clock stretching */\r
+ I2Cx->CR1 |= I2C_CR1_NOSTRETCH;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected I2C Clock stretching */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_NOSTRETCH);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Selects the specified I2C fast mode duty cycle.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_DutyCycle: specifies the fast mode duty cycle.\r
+ * This parameter can be one of the following values:\r
+ * @arg I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2\r
+ * @arg I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9\r
+ * @retval None\r
+ */\r
+void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_DUTY_CYCLE(I2C_DutyCycle));\r
+ if (I2C_DutyCycle != I2C_DutyCycle_16_9)\r
+ {\r
+ /* I2C fast mode Tlow/Thigh=2 */\r
+ I2Cx->CCR &= I2C_DutyCycle_2;\r
+ }\r
+ else\r
+ {\r
+ /* I2C fast mode Tlow/Thigh=16/9 */\r
+ I2Cx->CCR |= I2C_DutyCycle_16_9;\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Transmits the address byte to select the slave device.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param Address: specifies the slave address which will be transmitted\r
+ * @param I2C_Direction: specifies whether the I2C device will be a\r
+ * Transmitter or a Receiver. This parameter can be one of the following values\r
+ * @arg I2C_Direction_Transmitter: Transmitter mode\r
+ * @arg I2C_Direction_Receiver: Receiver mode\r
+ * @retval None.\r
+ */\r
+void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_DIRECTION(I2C_Direction));\r
+ /* Test on the direction to set/reset the read/write bit */\r
+ if (I2C_Direction != I2C_Direction_Transmitter)\r
+ {\r
+ /* Set the address bit0 for read */\r
+ Address |= I2C_OAR1_ADD0;\r
+ }\r
+ else\r
+ {\r
+ /* Reset the address bit0 for write */\r
+ Address &= (uint8_t)~((uint8_t)I2C_OAR1_ADD0);\r
+ }\r
+ /* Send the address */\r
+ I2Cx->DR = Address;\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup I2C_Group2 Data transfers functions\r
+ * @brief Data transfers functions \r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ Data transfers functions\r
+ =============================================================================== \r
+\r
+@endverbatim\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Sends a data byte through the I2Cx peripheral.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param Data: Byte to be transmitted..\r
+ * @retval None\r
+ */\r
+void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ /* Write in the DR register the data to be sent */\r
+ I2Cx->DR = Data;\r
+}\r
+\r
+/**\r
+ * @brief Returns the most recent received data by the I2Cx peripheral.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @retval The value of the received data.\r
+ */\r
+uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ /* Return the data in the DR register */\r
+ return (uint8_t)I2Cx->DR;\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup I2C_Group3 PEC management functions\r
+ * @brief PEC management functions \r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ PEC management functions\r
+ =============================================================================== \r
+\r
+@endverbatim\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C PEC transfer.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C PEC transmission.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the selected I2C PEC transmission */\r
+ I2Cx->CR1 |= I2C_CR1_PEC;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected I2C PEC transmission */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PEC);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Selects the specified I2C PEC position.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_PECPosition: specifies the PEC position. \r
+ * This parameter can be one of the following values:\r
+ * @arg I2C_PECPosition_Next: indicates that the next byte is PEC\r
+ * @arg I2C_PECPosition_Current: indicates that current byte is PEC\r
+ * @retval None\r
+ */\r
+void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_PEC_POSITION(I2C_PECPosition));\r
+ if (I2C_PECPosition == I2C_PECPosition_Next)\r
+ {\r
+ /* Next byte in shift register is PEC */\r
+ I2Cx->CR1 |= I2C_PECPosition_Next;\r
+ }\r
+ else\r
+ {\r
+ /* Current byte in shift register is PEC */\r
+ I2Cx->CR1 &= I2C_PECPosition_Current;\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the PEC value calculation of the transferred bytes.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2Cx PEC value calculation.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the selected I2C PEC calculation */\r
+ I2Cx->CR1 |= I2C_CR1_ENPEC;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected I2C PEC calculation */\r
+ I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENPEC);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Returns the PEC value for the specified I2C.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @retval The PEC value.\r
+ */\r
+uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ /* Return the selected I2C PEC value */\r
+ return ((I2Cx->SR2) >> 8);\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup I2C_Group4 DMA transfers management functions\r
+ * @brief DMA transfers management functions \r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ DMA transfers management functions\r
+ =============================================================================== \r
+ This section provides functions allowing to configure the I2C DMA channels \r
+ requests.\r
+ \r
+@endverbatim\r
+ * @{\r
+ */\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C DMA requests.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C DMA transfer.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the selected I2C DMA requests */\r
+ I2Cx->CR2 |= I2C_CR2_DMAEN;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected I2C DMA requests */\r
+ I2Cx->CR2 &= (uint16_t)~((uint16_t)I2C_CR2_DMAEN);\r
+ }\r
+}\r
+\r
+/**\r
+ * @brief Specifies that the next DMA transfer is the last one.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param NewState: new state of the I2C DMA last transfer.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Next DMA transfer is the last transfer */\r
+ I2Cx->CR2 |= I2C_CR2_LAST;\r
+ }\r
+ else\r
+ {\r
+ /* Next DMA transfer is not the last transfer */\r
+ I2Cx->CR2 &= (uint16_t)~((uint16_t)I2C_CR2_LAST);\r
+ }\r
+}\r
+\r
+/**\r
+ * @}\r
+ */\r
+\r
+/** @defgroup I2C_Group5 Interrupts events and flags management functions\r
+ * @brief Interrupts, events and flags management functions\r
+ *\r
+@verbatim \r
+ ===============================================================================\r
+ Interrupts, events and flags management functions\r
+ =============================================================================== \r
+ This section provides functions allowing to configure the I2C Interrupts \r
+ sources and check or clear the flags or 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
+ ===============================================================================\r
+ I2C State Monitoring Functions \r
+ =============================================================================== \r
+ This I2C driver provides three different ways for I2C state monitoring\r
+ depending on the application requirements and constraints:\r
+ \r
+ \r
+ 1. Basic state monitoring (Using I2C_CheckEvent() function)\r
+ -----------------------------------------------------------\r
+ It compares the status registers (SR1 and SR2) content to a given event\r
+ (can be the combination of one or more flags).\r
+ It returns SUCCESS if the current status includes the given flags \r
+ and returns ERROR if one or more flags are missing in the current status.\r
+\r
+ - When to use\r
+ - This function is suitable for most applications as well as for startup \r
+ activity since the events are fully described in the product reference \r
+ manual (RM0038).\r
+ - It is also suitable for users who need to define their own events.\r
+\r
+ - Limitations\r
+ - If an error occurs (ie. error flags are set besides to the monitored \r
+ flags), the I2C_CheckEvent() function may return SUCCESS despite \r
+ the communication hold or corrupted real state. \r
+ In this case, it is advised to use error interrupts to monitor \r
+ the error events and handle them in the interrupt IRQ handler.\r
+ \r
+ @note \r
+ For error management, it is advised to use the following functions:\r
+ - I2C_ITConfig() to configure and enable the error interrupts (I2C_IT_ERR).\r
+ - I2Cx_ER_IRQHandler() which is called when the error interrupt occurs.\r
+ Where x is the peripheral instance (I2C1, I2C2 ...)\r
+ - I2C_GetFlagStatus() or I2C_GetITStatus() to be called into the \r
+ I2Cx_ER_IRQHandler() function in order to determine which error occurred.\r
+ - I2C_ClearFlag() or I2C_ClearITPendingBit() and/or I2C_SoftwareResetCmd() \r
+ and/or I2C_GenerateStop() in order to clear the error flag and source \r
+ and return to correct communication status.\r
+ \r
+ \r
+ 2. Advanced state monitoring (Using the function I2C_GetLastEvent())\r
+ -------------------------------------------------------------------- \r
+ Using the function I2C_GetLastEvent() which returns the image of both status \r
+ registers in a single word (uint32_t) (Status Register 2 value is shifted left \r
+ by 16 bits and concatenated to Status Register 1).\r
+\r
+ - When to use\r
+ - This function is suitable for the same applications above but it \r
+ allows to overcome the mentioned limitation of I2C_GetFlagStatus() \r
+ function.\r
+ - The returned value could be compared to events already defined in \r
+ the library (stm32l1xx_i2c.h) or to custom values defined by user.\r
+ This function is suitable when multiple flags are monitored at the \r
+ same time.\r
+ - At the opposite of I2C_CheckEvent() function, this function allows \r
+ user to choose when an event is accepted (when all events flags are \r
+ set and no other flags are set or just when the needed flags are set \r
+ like I2C_CheckEvent() function.\r
+\r
+ - Limitations\r
+ - User may need to define his own events.\r
+ - Same remark concerning the error management is applicable for this \r
+ function if user decides to check only regular communication flags \r
+ (and ignores error flags).\r
+ \r
+ \r
+ 3. Flag-based state monitoring (Using the function I2C_GetFlagStatus())\r
+ -----------------------------------------------------------------------\r
+ \r
+ Using the function I2C_GetFlagStatus() which simply returns the status of \r
+ one single flag (ie. I2C_FLAG_RXNE ...). \r
+\r
+ - When to use\r
+ - This function could be used for specific applications or in debug \r
+ phase.\r
+ - It is suitable when only one flag checking is needed (most I2C \r
+ events are monitored through multiple flags).\r
+ - Limitations: \r
+ - When calling this function, the Status register is accessed. \r
+ Some flags are cleared when the status register is accessed. \r
+ So checking the status of one Flag, may clear other ones.\r
+ - Function may need to be called twice or more in order to monitor \r
+ one single event.\r
+ \r
+ For detailed description of Events, please refer to section I2C_Events in \r
+ stm32l1xx_i2c.h file.\r
+ \r
+@endverbatim\r
+ * @{\r
+ */\r
+ \r
+/**\r
+ * @brief Reads the specified I2C register and returns its value.\r
+ * @param I2C_Register: specifies the register to read.\r
+ * This parameter can be one of the following values:\r
+ * @arg I2C_Register_CR1: CR1 register.\r
+ * @arg I2C_Register_CR2: CR2 register.\r
+ * @arg I2C_Register_OAR1: OAR1 register.\r
+ * @arg I2C_Register_OAR2: OAR2 register.\r
+ * @arg I2C_Register_DR: DR register.\r
+ * @arg I2C_Register_SR1: SR1 register.\r
+ * @arg I2C_Register_SR2: SR2 register.\r
+ * @arg I2C_Register_CCR: CCR register.\r
+ * @arg I2C_Register_TRISE: TRISE register.\r
+ * @retval The value of the read register.\r
+ */\r
+uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register)\r
+{\r
+ __IO uint32_t tmp = 0;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_REGISTER(I2C_Register));\r
+\r
+ tmp = (uint32_t) I2Cx;\r
+ tmp += I2C_Register;\r
+\r
+ /* Return the selected register value */\r
+ return (*(__IO uint16_t *) tmp);\r
+}\r
+\r
+/**\r
+ * @brief Enables or disables the specified I2C interrupts.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_IT: specifies the I2C interrupts sources to be enabled or disabled. \r
+ * This parameter can be any combination of the following values:\r
+ * @arg I2C_IT_BUF: Buffer interrupt mask\r
+ * @arg I2C_IT_EVT: Event interrupt mask\r
+ * @arg I2C_IT_ERR: Error interrupt mask\r
+ * @param NewState: new state of the specified I2C interrupts.\r
+ * This parameter can be: ENABLE or DISABLE.\r
+ * @retval None\r
+ */\r
+void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState)\r
+{\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_FUNCTIONAL_STATE(NewState));\r
+ assert_param(IS_I2C_CONFIG_IT(I2C_IT));\r
+ \r
+ if (NewState != DISABLE)\r
+ {\r
+ /* Enable the selected I2C interrupts */\r
+ I2Cx->CR2 |= I2C_IT;\r
+ }\r
+ else\r
+ {\r
+ /* Disable the selected I2C interrupts */\r
+ I2Cx->CR2 &= (uint16_t)~I2C_IT;\r
+ }\r
+}\r
+\r
+/**\r
+ ===============================================================================\r
+ 1. Basic state monitoring \r
+ =============================================================================== \r
+ */\r
+\r
+/**\r
+ * @brief Checks whether the last I2Cx Event is equal to the one passed\r
+ * as parameter.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_EVENT: specifies the event to be checked. \r
+ * This parameter can be one of the following values:\r
+ * @arg I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED : EV1\r
+ * @arg I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED : EV1\r
+ * @arg I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED : EV1\r
+ * @arg I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED : EV1\r
+ * @arg I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED : EV1\r
+ * @arg I2C_EVENT_SLAVE_BYTE_RECEIVED : EV2\r
+ * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF) : EV2\r
+ * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL) : EV2\r
+ * @arg I2C_EVENT_SLAVE_BYTE_TRANSMITTED : EV3\r
+ * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF) : EV3\r
+ * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL) : EV3\r
+ * @arg I2C_EVENT_SLAVE_ACK_FAILURE : EV3_2\r
+ * @arg I2C_EVENT_SLAVE_STOP_DETECTED : EV4\r
+ * @arg I2C_EVENT_MASTER_MODE_SELECT : EV5\r
+ * @arg I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED : EV6 \r
+ * @arg I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED : EV6\r
+ * @arg I2C_EVENT_MASTER_BYTE_RECEIVED : EV7\r
+ * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTING : EV8\r
+ * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTED : EV8_2\r
+ * @arg I2C_EVENT_MASTER_MODE_ADDRESS10 : EV9\r
+ * \r
+ * @note: For detailed description of Events, please refer to section \r
+ * I2C_Events in stm32l1xx_i2c.h file.\r
+ * \r
+ * @retval An ErrorStatus enumeration value:\r
+ * - SUCCESS: Last event is equal to the I2C_EVENT\r
+ * - ERROR: Last event is different from the I2C_EVENT\r
+ */\r
+ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT)\r
+{\r
+ uint32_t lastevent = 0;\r
+ uint32_t flag1 = 0, flag2 = 0;\r
+ ErrorStatus status = ERROR;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_EVENT(I2C_EVENT));\r
+\r
+ /* Read the I2Cx status register */\r
+ flag1 = I2Cx->SR1;\r
+ flag2 = I2Cx->SR2;\r
+ flag2 = flag2 << 16;\r
+\r
+ /* Get the last event value from I2C status register */\r
+ lastevent = (flag1 | flag2) & FLAG_MASK;\r
+\r
+ /* Check whether the last event contains the I2C_EVENT */\r
+ if ((lastevent & I2C_EVENT) == I2C_EVENT)\r
+ {\r
+ /* SUCCESS: last event is equal to I2C_EVENT */\r
+ status = SUCCESS;\r
+ }\r
+ else\r
+ {\r
+ /* ERROR: last event is different from I2C_EVENT */\r
+ status = ERROR;\r
+ }\r
+ /* Return status */\r
+ return status;\r
+}\r
+\r
+/**\r
+ ===============================================================================\r
+ 2. Advanced state monitoring \r
+ =============================================================================== \r
+ */\r
+\r
+/**\r
+ * @brief Returns the last I2Cx Event.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * \r
+ * @note: For detailed description of Events, please refer to section \r
+ * I2C_Events in stm32l1xx_i2c.h file.\r
+ * \r
+ * @retval The last event\r
+ */\r
+uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx)\r
+{\r
+ uint32_t lastevent = 0;\r
+ uint32_t flag1 = 0, flag2 = 0;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+\r
+ /* Read the I2Cx status register */\r
+ flag1 = I2Cx->SR1;\r
+ flag2 = I2Cx->SR2;\r
+ flag2 = flag2 << 16;\r
+\r
+ /* Get the last event value from I2C status register */\r
+ lastevent = (flag1 | flag2) & FLAG_MASK;\r
+\r
+ /* Return status */\r
+ return lastevent;\r
+}\r
+\r
+/**\r
+ ===============================================================================\r
+ 3. Flag-based state monitoring \r
+ =============================================================================== \r
+ */\r
+\r
+/**\r
+ * @brief Checks whether the specified I2C flag is set or not.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_FLAG: specifies the flag to check. \r
+ * This parameter can be one of the following values:\r
+ * @arg I2C_FLAG_DUALF: Dual flag (Slave mode)\r
+ * @arg I2C_FLAG_SMBHOST: SMBus host header (Slave mode)\r
+ * @arg I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode)\r
+ * @arg I2C_FLAG_GENCALL: General call header flag (Slave mode)\r
+ * @arg I2C_FLAG_TRA: Transmitter/Receiver flag\r
+ * @arg I2C_FLAG_BUSY: Bus busy flag\r
+ * @arg I2C_FLAG_MSL: Master/Slave flag\r
+ * @arg I2C_FLAG_SMBALERT: SMBus Alert flag\r
+ * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag\r
+ * @arg I2C_FLAG_PECERR: PEC error in reception flag\r
+ * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)\r
+ * @arg I2C_FLAG_AF: Acknowledge failure flag\r
+ * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)\r
+ * @arg I2C_FLAG_BERR: Bus error flag\r
+ * @arg I2C_FLAG_TXE: Data register empty flag (Transmitter)\r
+ * @arg I2C_FLAG_RXNE: Data register not empty (Receiver) flag\r
+ * @arg I2C_FLAG_STOPF: Stop detection flag (Slave mode)\r
+ * @arg I2C_FLAG_ADD10: 10-bit header sent flag (Master mode)\r
+ * @arg I2C_FLAG_BTF: Byte transfer finished flag\r
+ * @arg I2C_FLAG_ADDR: Address sent flag (Master mode) \93ADSL\94\r
+ * Address matched flag (Slave mode)\94ENDAD\94\r
+ * @arg I2C_FLAG_SB: Start bit flag (Master mode)\r
+ * @retval The new state of I2C_FLAG (SET or RESET).\r
+ */\r
+FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)\r
+{\r
+ FlagStatus bitstatus = RESET;\r
+ __IO uint32_t i2creg = 0, i2cxbase = 0;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_GET_FLAG(I2C_FLAG));\r
+\r
+ /* Get the I2Cx peripheral base address */\r
+ i2cxbase = (uint32_t)I2Cx;\r
+ \r
+ /* Read flag register index */\r
+ i2creg = I2C_FLAG >> 28;\r
+ \r
+ /* Get bit[23:0] of the flag */\r
+ I2C_FLAG &= FLAG_MASK;\r
+ \r
+ if(i2creg != 0)\r
+ {\r
+ /* Get the I2Cx SR1 register address */\r
+ i2cxbase += 0x14;\r
+ }\r
+ else\r
+ {\r
+ /* Flag in I2Cx SR2 Register */\r
+ I2C_FLAG = (uint32_t)(I2C_FLAG >> 16);\r
+ /* Get the I2Cx SR2 register address */\r
+ i2cxbase += 0x18;\r
+ }\r
+ \r
+ if(((*(__IO uint32_t *)i2cxbase) & I2C_FLAG) != (uint32_t)RESET)\r
+ {\r
+ /* I2C_FLAG is set */\r
+ bitstatus = SET;\r
+ }\r
+ else\r
+ {\r
+ /* I2C_FLAG is reset */\r
+ bitstatus = RESET;\r
+ }\r
+ \r
+ /* Return the I2C_FLAG status */\r
+ return bitstatus;\r
+}\r
+\r
+/**\r
+ * @brief Clears the I2Cx's pending flags.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_FLAG: specifies the flag to clear. \r
+ * This parameter can be any combination of the following values:\r
+ * @arg I2C_FLAG_SMBALERT: SMBus Alert flag\r
+ * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag\r
+ * @arg I2C_FLAG_PECERR: PEC error in reception flag\r
+ * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)\r
+ * @arg I2C_FLAG_AF: Acknowledge failure flag\r
+ * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)\r
+ * @arg I2C_FLAG_BERR: Bus error flag\r
+ * \r
+ * @note\r
+ * - STOPF (STOP detection) is cleared by software sequence: a read operation \r
+ * to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation \r
+ * to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).\r
+ * - ADD10 (10-bit header sent) is cleared by software sequence: a read \r
+ * operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the \r
+ * second byte of the address in DR register.\r
+ * - BTF (Byte Transfer Finished) is cleared by software sequence: a read \r
+ * operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a \r
+ * read/write to I2C_DR register (I2C_SendData()).\r
+ * - ADDR (Address sent) is cleared by software sequence: a read operation to \r
+ * I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to \r
+ * I2C_SR2 register ((void)(I2Cx->SR2)).\r
+ * - SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1\r
+ * register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR\r
+ * register (I2C_SendData()).\r
+ * @retval None\r
+ */\r
+void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)\r
+{\r
+ uint32_t flagpos = 0;\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG));\r
+ /* Get the I2C flag position */\r
+ flagpos = I2C_FLAG & FLAG_MASK;\r
+ /* Clear the selected I2C flag */\r
+ I2Cx->SR1 = (uint16_t)~flagpos;\r
+}\r
+\r
+/**\r
+ * @brief Checks whether the specified I2C interrupt has occurred or not.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_IT: specifies the interrupt source to check. \r
+ * This parameter can be one of the following values:\r
+ * @arg I2C_IT_SMBALERT: SMBus Alert flag\r
+ * @arg I2C_IT_TIMEOUT: Timeout or Tlow error flag\r
+ * @arg I2C_IT_PECERR: PEC error in reception flag\r
+ * @arg I2C_IT_OVR: Overrun/Underrun flag (Slave mode)\r
+ * @arg I2C_IT_AF: Acknowledge failure flag\r
+ * @arg I2C_IT_ARLO: Arbitration lost flag (Master mode)\r
+ * @arg I2C_IT_BERR: Bus error flag\r
+ * @arg I2C_IT_TXE: Data register empty flag (Transmitter)\r
+ * @arg I2C_IT_RXNE: Data register not empty (Receiver) flag\r
+ * @arg I2C_IT_STOPF: Stop detection flag (Slave mode)\r
+ * @arg I2C_IT_ADD10: 10-bit header sent flag (Master mode)\r
+ * @arg I2C_IT_BTF: Byte transfer finished flag\r
+ * @arg I2C_IT_ADDR: Address sent flag (Master mode) \93ADSL\94\r
+ * Address matched flag (Slave mode)\94ENDAD\94\r
+ * @arg I2C_IT_SB: Start bit flag (Master mode)\r
+ * @retval The new state of I2C_IT (SET or RESET).\r
+ */\r
+ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT)\r
+{\r
+ ITStatus bitstatus = RESET;\r
+ uint32_t enablestatus = 0;\r
+\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_GET_IT(I2C_IT));\r
+\r
+ /* Check if the interrupt source is enabled or not */\r
+ enablestatus = (uint32_t)(((I2C_IT & ITEN_MASK) >> 16) & (I2Cx->CR2)) ;\r
+ \r
+ /* Get bit[23:0] of the flag */\r
+ I2C_IT &= FLAG_MASK;\r
+\r
+ /* Check the status of the specified I2C flag */\r
+ if (((I2Cx->SR1 & I2C_IT) != (uint32_t)RESET) && enablestatus)\r
+ {\r
+ /* I2C_IT is set */\r
+ bitstatus = SET;\r
+ }\r
+ else\r
+ {\r
+ /* I2C_IT is reset */\r
+ bitstatus = RESET;\r
+ }\r
+ /* Return the I2C_IT status */\r
+ return bitstatus;\r
+}\r
+\r
+/**\r
+ * @brief Clears the I2Cx\92s interrupt pending bits.\r
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.\r
+ * @param I2C_IT: specifies the interrupt pending bit to clear. \r
+ * This parameter can be any combination of the following values:\r
+ * @arg I2C_IT_SMBALERT: SMBus Alert interrupt\r
+ * @arg I2C_IT_TIMEOUT: Timeout or Tlow error interrupt\r
+ * @arg I2C_IT_PECERR: PEC error in reception interrupt\r
+ * @arg I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode)\r
+ * @arg I2C_IT_AF: Acknowledge failure interrupt\r
+ * @arg I2C_IT_ARLO: Arbitration lost interrupt (Master mode)\r
+ * @arg I2C_IT_BERR: Bus error interrupt\r
+ * \r
+ * @note\r
+ * - STOPF (STOP detection) is cleared by software sequence: a read operation \r
+ * to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to \r
+ * I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).\r
+ * - ADD10 (10-bit header sent) is cleared by software sequence: a read \r
+ * operation to I2C_SR1 (I2C_GetITStatus()) followed by writing the second \r
+ * byte of the address in I2C_DR register.\r
+ * - BTF (Byte Transfer Finished) is cleared by software sequence: a read \r
+ * operation to I2C_SR1 register (I2C_GetITStatus()) followed by a \r
+ * read/write to I2C_DR register (I2C_SendData()).\r
+ * - ADDR (Address sent) is cleared by software sequence: a read operation to \r
+ * I2C_SR1 register (I2C_GetITStatus()) followed by a read operation to \r
+ * I2C_SR2 register ((void)(I2Cx->SR2)).\r
+ * - SB (Start Bit) is cleared by software sequence: a read operation to \r
+ * I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to \r
+ * I2C_DR register (I2C_SendData()).\r
+ * @retval None\r
+ */\r
+void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT)\r
+{\r
+ uint32_t flagpos = 0;\r
+ /* Check the parameters */\r
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));\r
+ assert_param(IS_I2C_CLEAR_IT(I2C_IT));\r
+ /* Get the I2C flag position */\r
+ flagpos = I2C_IT & FLAG_MASK;\r
+ /* Clear the selected I2C flag */\r
+ I2Cx->SR1 = (uint16_t)~flagpos;\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
+\r
+\r
+\r
projects / fw / stlink / blobdiff