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author | Trygve Laugstøl <trygvis@inamo.no> | 2017-01-25 22:24:18 +0100 |
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committer | Trygve Laugstøl <trygvis@inamo.no> | 2017-01-25 22:29:25 +0100 |
commit | 40e04e3772726829d66c12e69f24b03920d79c67 (patch) | |
tree | 636811bad956798c9d5d22de9e7ba8c799b8d791 /tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_i2c.c | |
parent | 2fff65aed2477a503c72629d27e2a330d30c02d1 (diff) | |
download | stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.tar.gz stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.tar.bz2 stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.tar.xz stm32f103-playground-40e04e3772726829d66c12e69f24b03920d79c67.zip |
o Moving tinyprintf and stm libraries under thirdparty.
Diffstat (limited to 'tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_i2c.c')
-rw-r--r-- | tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_i2c.c | 1331 |
1 files changed, 0 insertions, 1331 deletions
diff --git a/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_i2c.c b/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_i2c.c deleted file mode 100644 index 4ea321c..0000000 --- a/tmp/STM32F10x_StdPeriph_Lib_V3.5.0/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_i2c.c +++ /dev/null @@ -1,1331 +0,0 @@ -/** - ****************************************************************************** - * @file stm32f10x_i2c.c - * @author MCD Application Team - * @version V3.5.0 - * @date 11-March-2011 - * @brief This file provides all the I2C firmware functions. - ****************************************************************************** - * @attention - * - * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS - * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE - * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY - * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING - * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE - * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. - * - * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2> - ****************************************************************************** - */ - -/* Includes ------------------------------------------------------------------*/ -#include "stm32f10x_i2c.h" -#include "stm32f10x_rcc.h" - - -/** @addtogroup STM32F10x_StdPeriph_Driver - * @{ - */ - -/** @defgroup I2C - * @brief I2C driver modules - * @{ - */ - -/** @defgroup I2C_Private_TypesDefinitions - * @{ - */ - -/** - * @} - */ - -/** @defgroup I2C_Private_Defines - * @{ - */ - -/* I2C SPE mask */ -#define CR1_PE_Set ((uint16_t)0x0001) -#define CR1_PE_Reset ((uint16_t)0xFFFE) - -/* I2C START mask */ -#define CR1_START_Set ((uint16_t)0x0100) -#define CR1_START_Reset ((uint16_t)0xFEFF) - -/* I2C STOP mask */ -#define CR1_STOP_Set ((uint16_t)0x0200) -#define CR1_STOP_Reset ((uint16_t)0xFDFF) - -/* I2C ACK mask */ -#define CR1_ACK_Set ((uint16_t)0x0400) -#define CR1_ACK_Reset ((uint16_t)0xFBFF) - -/* I2C ENGC mask */ -#define CR1_ENGC_Set ((uint16_t)0x0040) -#define CR1_ENGC_Reset ((uint16_t)0xFFBF) - -/* I2C SWRST mask */ -#define CR1_SWRST_Set ((uint16_t)0x8000) -#define CR1_SWRST_Reset ((uint16_t)0x7FFF) - -/* I2C PEC mask */ -#define CR1_PEC_Set ((uint16_t)0x1000) -#define CR1_PEC_Reset ((uint16_t)0xEFFF) - -/* I2C ENPEC mask */ -#define CR1_ENPEC_Set ((uint16_t)0x0020) -#define CR1_ENPEC_Reset ((uint16_t)0xFFDF) - -/* I2C ENARP mask */ -#define CR1_ENARP_Set ((uint16_t)0x0010) -#define CR1_ENARP_Reset ((uint16_t)0xFFEF) - -/* I2C NOSTRETCH mask */ -#define CR1_NOSTRETCH_Set ((uint16_t)0x0080) -#define CR1_NOSTRETCH_Reset ((uint16_t)0xFF7F) - -/* I2C registers Masks */ -#define CR1_CLEAR_Mask ((uint16_t)0xFBF5) - -/* I2C DMAEN mask */ -#define CR2_DMAEN_Set ((uint16_t)0x0800) -#define CR2_DMAEN_Reset ((uint16_t)0xF7FF) - -/* I2C LAST mask */ -#define CR2_LAST_Set ((uint16_t)0x1000) -#define CR2_LAST_Reset ((uint16_t)0xEFFF) - -/* I2C FREQ mask */ -#define CR2_FREQ_Reset ((uint16_t)0xFFC0) - -/* I2C ADD0 mask */ -#define OAR1_ADD0_Set ((uint16_t)0x0001) -#define OAR1_ADD0_Reset ((uint16_t)0xFFFE) - -/* I2C ENDUAL mask */ -#define OAR2_ENDUAL_Set ((uint16_t)0x0001) -#define OAR2_ENDUAL_Reset ((uint16_t)0xFFFE) - -/* I2C ADD2 mask */ -#define OAR2_ADD2_Reset ((uint16_t)0xFF01) - -/* I2C F/S mask */ -#define CCR_FS_Set ((uint16_t)0x8000) - -/* I2C CCR mask */ -#define CCR_CCR_Set ((uint16_t)0x0FFF) - -/* I2C FLAG mask */ -#define FLAG_Mask ((uint32_t)0x00FFFFFF) - -/* I2C Interrupt Enable mask */ -#define ITEN_Mask ((uint32_t)0x07000000) - -/** - * @} - */ - -/** @defgroup I2C_Private_Macros - * @{ - */ - -/** - * @} - */ - -/** @defgroup I2C_Private_Variables - * @{ - */ - -/** - * @} - */ - -/** @defgroup I2C_Private_FunctionPrototypes - * @{ - */ - -/** - * @} - */ - -/** @defgroup I2C_Private_Functions - * @{ - */ - -/** - * @brief Deinitializes the I2Cx peripheral registers to their default reset values. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @retval None - */ -void I2C_DeInit(I2C_TypeDef* I2Cx) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - - if (I2Cx == I2C1) - { - /* Enable I2C1 reset state */ - RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE); - /* Release I2C1 from reset state */ - RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE); - } - else - { - /* Enable I2C2 reset state */ - RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE); - /* Release I2C2 from reset state */ - RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE); - } -} - -/** - * @brief Initializes the I2Cx peripheral according to the specified - * parameters in the I2C_InitStruct. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_InitStruct: pointer to a I2C_InitTypeDef structure that - * contains the configuration information for the specified I2C peripheral. - * @retval None - */ -void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct) -{ - uint16_t tmpreg = 0, freqrange = 0; - uint16_t result = 0x04; - uint32_t pclk1 = 8000000; - RCC_ClocksTypeDef rcc_clocks; - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed)); - assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode)); - assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle)); - assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1)); - assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack)); - assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress)); - -/*---------------------------- I2Cx CR2 Configuration ------------------------*/ - /* Get the I2Cx CR2 value */ - tmpreg = I2Cx->CR2; - /* Clear frequency FREQ[5:0] bits */ - tmpreg &= CR2_FREQ_Reset; - /* Get pclk1 frequency value */ - RCC_GetClocksFreq(&rcc_clocks); - pclk1 = rcc_clocks.PCLK1_Frequency; - /* Set frequency bits depending on pclk1 value */ - freqrange = (uint16_t)(pclk1 / 1000000); - tmpreg |= freqrange; - /* Write to I2Cx CR2 */ - I2Cx->CR2 = tmpreg; - -/*---------------------------- I2Cx CCR Configuration ------------------------*/ - /* Disable the selected I2C peripheral to configure TRISE */ - I2Cx->CR1 &= CR1_PE_Reset; - /* Reset tmpreg value */ - /* Clear F/S, DUTY and CCR[11:0] bits */ - tmpreg = 0; - - /* Configure speed in standard mode */ - if (I2C_InitStruct->I2C_ClockSpeed <= 100000) - { - /* Standard mode speed calculate */ - result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1)); - /* Test if CCR value is under 0x4*/ - if (result < 0x04) - { - /* Set minimum allowed value */ - result = 0x04; - } - /* Set speed value for standard mode */ - tmpreg |= result; - /* Set Maximum Rise Time for standard mode */ - I2Cx->TRISE = freqrange + 1; - } - /* Configure speed in fast mode */ - else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/ - { - if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2) - { - /* Fast mode speed calculate: Tlow/Thigh = 2 */ - result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3)); - } - else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/ - { - /* Fast mode speed calculate: Tlow/Thigh = 16/9 */ - result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25)); - /* Set DUTY bit */ - result |= I2C_DutyCycle_16_9; - } - - /* Test if CCR value is under 0x1*/ - if ((result & CCR_CCR_Set) == 0) - { - /* Set minimum allowed value */ - result |= (uint16_t)0x0001; - } - /* Set speed value and set F/S bit for fast mode */ - tmpreg |= (uint16_t)(result | CCR_FS_Set); - /* Set Maximum Rise Time for fast mode */ - I2Cx->TRISE = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1); - } - - /* Write to I2Cx CCR */ - I2Cx->CCR = tmpreg; - /* Enable the selected I2C peripheral */ - I2Cx->CR1 |= CR1_PE_Set; - -/*---------------------------- I2Cx CR1 Configuration ------------------------*/ - /* Get the I2Cx CR1 value */ - tmpreg = I2Cx->CR1; - /* Clear ACK, SMBTYPE and SMBUS bits */ - tmpreg &= CR1_CLEAR_Mask; - /* Configure I2Cx: mode and acknowledgement */ - /* Set SMBTYPE and SMBUS bits according to I2C_Mode value */ - /* Set ACK bit according to I2C_Ack value */ - tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack); - /* Write to I2Cx CR1 */ - I2Cx->CR1 = tmpreg; - -/*---------------------------- I2Cx OAR1 Configuration -----------------------*/ - /* Set I2Cx Own Address1 and acknowledged address */ - I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1); -} - -/** - * @brief Fills each I2C_InitStruct member with its default value. - * @param I2C_InitStruct: pointer to an I2C_InitTypeDef structure which will be initialized. - * @retval None - */ -void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct) -{ -/*---------------- Reset I2C init structure parameters values ----------------*/ - /* initialize the I2C_ClockSpeed member */ - I2C_InitStruct->I2C_ClockSpeed = 5000; - /* Initialize the I2C_Mode member */ - I2C_InitStruct->I2C_Mode = I2C_Mode_I2C; - /* Initialize the I2C_DutyCycle member */ - I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2; - /* Initialize the I2C_OwnAddress1 member */ - I2C_InitStruct->I2C_OwnAddress1 = 0; - /* Initialize the I2C_Ack member */ - I2C_InitStruct->I2C_Ack = I2C_Ack_Disable; - /* Initialize the I2C_AcknowledgedAddress member */ - I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; -} - -/** - * @brief Enables or disables the specified I2C peripheral. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2Cx peripheral. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable the selected I2C peripheral */ - I2Cx->CR1 |= CR1_PE_Set; - } - else - { - /* Disable the selected I2C peripheral */ - I2Cx->CR1 &= CR1_PE_Reset; - } -} - -/** - * @brief Enables or disables the specified I2C DMA requests. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C DMA transfer. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable the selected I2C DMA requests */ - I2Cx->CR2 |= CR2_DMAEN_Set; - } - else - { - /* Disable the selected I2C DMA requests */ - I2Cx->CR2 &= CR2_DMAEN_Reset; - } -} - -/** - * @brief Specifies if the next DMA transfer will be the last one. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C DMA last transfer. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Next DMA transfer is the last transfer */ - I2Cx->CR2 |= CR2_LAST_Set; - } - else - { - /* Next DMA transfer is not the last transfer */ - I2Cx->CR2 &= CR2_LAST_Reset; - } -} - -/** - * @brief Generates I2Cx communication START condition. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C START condition generation. - * This parameter can be: ENABLE or DISABLE. - * @retval None. - */ -void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Generate a START condition */ - I2Cx->CR1 |= CR1_START_Set; - } - else - { - /* Disable the START condition generation */ - I2Cx->CR1 &= CR1_START_Reset; - } -} - -/** - * @brief Generates I2Cx communication STOP condition. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C STOP condition generation. - * This parameter can be: ENABLE or DISABLE. - * @retval None. - */ -void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Generate a STOP condition */ - I2Cx->CR1 |= CR1_STOP_Set; - } - else - { - /* Disable the STOP condition generation */ - I2Cx->CR1 &= CR1_STOP_Reset; - } -} - -/** - * @brief Enables or disables the specified I2C acknowledge feature. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C Acknowledgement. - * This parameter can be: ENABLE or DISABLE. - * @retval None. - */ -void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable the acknowledgement */ - I2Cx->CR1 |= CR1_ACK_Set; - } - else - { - /* Disable the acknowledgement */ - I2Cx->CR1 &= CR1_ACK_Reset; - } -} - -/** - * @brief Configures the specified I2C own address2. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param Address: specifies the 7bit I2C own address2. - * @retval None. - */ -void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address) -{ - uint16_t tmpreg = 0; - - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - - /* Get the old register value */ - tmpreg = I2Cx->OAR2; - - /* Reset I2Cx Own address2 bit [7:1] */ - tmpreg &= OAR2_ADD2_Reset; - - /* Set I2Cx Own address2 */ - tmpreg |= (uint16_t)((uint16_t)Address & (uint16_t)0x00FE); - - /* Store the new register value */ - I2Cx->OAR2 = tmpreg; -} - -/** - * @brief Enables or disables the specified I2C dual addressing mode. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C dual addressing mode. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable dual addressing mode */ - I2Cx->OAR2 |= OAR2_ENDUAL_Set; - } - else - { - /* Disable dual addressing mode */ - I2Cx->OAR2 &= OAR2_ENDUAL_Reset; - } -} - -/** - * @brief Enables or disables the specified I2C general call feature. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C General call. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable generall call */ - I2Cx->CR1 |= CR1_ENGC_Set; - } - else - { - /* Disable generall call */ - I2Cx->CR1 &= CR1_ENGC_Reset; - } -} - -/** - * @brief Enables or disables the specified I2C interrupts. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_IT: specifies the I2C interrupts sources to be enabled or disabled. - * This parameter can be any combination of the following values: - * @arg I2C_IT_BUF: Buffer interrupt mask - * @arg I2C_IT_EVT: Event interrupt mask - * @arg I2C_IT_ERR: Error interrupt mask - * @param NewState: new state of the specified I2C interrupts. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - assert_param(IS_I2C_CONFIG_IT(I2C_IT)); - - if (NewState != DISABLE) - { - /* Enable the selected I2C interrupts */ - I2Cx->CR2 |= I2C_IT; - } - else - { - /* Disable the selected I2C interrupts */ - I2Cx->CR2 &= (uint16_t)~I2C_IT; - } -} - -/** - * @brief Sends a data byte through the I2Cx peripheral. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param Data: Byte to be transmitted.. - * @retval None - */ -void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - /* Write in the DR register the data to be sent */ - I2Cx->DR = Data; -} - -/** - * @brief Returns the most recent received data by the I2Cx peripheral. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @retval The value of the received data. - */ -uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - /* Return the data in the DR register */ - return (uint8_t)I2Cx->DR; -} - -/** - * @brief Transmits the address byte to select the slave device. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param Address: specifies the slave address which will be transmitted - * @param I2C_Direction: specifies whether the I2C device will be a - * Transmitter or a Receiver. This parameter can be one of the following values - * @arg I2C_Direction_Transmitter: Transmitter mode - * @arg I2C_Direction_Receiver: Receiver mode - * @retval None. - */ -void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_DIRECTION(I2C_Direction)); - /* Test on the direction to set/reset the read/write bit */ - if (I2C_Direction != I2C_Direction_Transmitter) - { - /* Set the address bit0 for read */ - Address |= OAR1_ADD0_Set; - } - else - { - /* Reset the address bit0 for write */ - Address &= OAR1_ADD0_Reset; - } - /* Send the address */ - I2Cx->DR = Address; -} - -/** - * @brief Reads the specified I2C register and returns its value. - * @param I2C_Register: specifies the register to read. - * This parameter can be one of the following values: - * @arg I2C_Register_CR1: CR1 register. - * @arg I2C_Register_CR2: CR2 register. - * @arg I2C_Register_OAR1: OAR1 register. - * @arg I2C_Register_OAR2: OAR2 register. - * @arg I2C_Register_DR: DR register. - * @arg I2C_Register_SR1: SR1 register. - * @arg I2C_Register_SR2: SR2 register. - * @arg I2C_Register_CCR: CCR register. - * @arg I2C_Register_TRISE: TRISE register. - * @retval The value of the read register. - */ -uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register) -{ - __IO uint32_t tmp = 0; - - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_REGISTER(I2C_Register)); - - tmp = (uint32_t) I2Cx; - tmp += I2C_Register; - - /* Return the selected register value */ - return (*(__IO uint16_t *) tmp); -} - -/** - * @brief Enables or disables the specified I2C software reset. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C software reset. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Peripheral under reset */ - I2Cx->CR1 |= CR1_SWRST_Set; - } - else - { - /* Peripheral not under reset */ - I2Cx->CR1 &= CR1_SWRST_Reset; - } -} - -/** - * @brief Selects the specified I2C NACK position in master receiver mode. - * This function is useful in I2C Master Receiver mode when the number - * of data to be received is equal to 2. In this case, this function - * should be called (with parameter I2C_NACKPosition_Next) before data - * reception starts,as described in the 2-byte reception procedure - * recommended in Reference Manual in Section: Master receiver. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_NACKPosition: specifies the NACK position. - * This parameter can be one of the following values: - * @arg I2C_NACKPosition_Next: indicates that the next byte will be the last - * received byte. - * @arg I2C_NACKPosition_Current: indicates that current byte is the last - * received byte. - * - * @note This function configures the same bit (POS) as I2C_PECPositionConfig() - * but is intended to be used in I2C mode while I2C_PECPositionConfig() - * is intended to used in SMBUS mode. - * - * @retval None - */ -void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_NACK_POSITION(I2C_NACKPosition)); - - /* Check the input parameter */ - if (I2C_NACKPosition == I2C_NACKPosition_Next) - { - /* Next byte in shift register is the last received byte */ - I2Cx->CR1 |= I2C_NACKPosition_Next; - } - else - { - /* Current byte in shift register is the last received byte */ - I2Cx->CR1 &= I2C_NACKPosition_Current; - } -} - -/** - * @brief Drives the SMBusAlert pin high or low for the specified I2C. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_SMBusAlert: specifies SMBAlert pin level. - * This parameter can be one of the following values: - * @arg I2C_SMBusAlert_Low: SMBAlert pin driven low - * @arg I2C_SMBusAlert_High: SMBAlert pin driven high - * @retval None - */ -void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert)); - if (I2C_SMBusAlert == I2C_SMBusAlert_Low) - { - /* Drive the SMBusAlert pin Low */ - I2Cx->CR1 |= I2C_SMBusAlert_Low; - } - else - { - /* Drive the SMBusAlert pin High */ - I2Cx->CR1 &= I2C_SMBusAlert_High; - } -} - -/** - * @brief Enables or disables the specified I2C PEC transfer. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2C PEC transmission. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable the selected I2C PEC transmission */ - I2Cx->CR1 |= CR1_PEC_Set; - } - else - { - /* Disable the selected I2C PEC transmission */ - I2Cx->CR1 &= CR1_PEC_Reset; - } -} - -/** - * @brief Selects the specified I2C PEC position. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_PECPosition: specifies the PEC position. - * This parameter can be one of the following values: - * @arg I2C_PECPosition_Next: indicates that the next byte is PEC - * @arg I2C_PECPosition_Current: indicates that current byte is PEC - * - * @note This function configures the same bit (POS) as I2C_NACKPositionConfig() - * but is intended to be used in SMBUS mode while I2C_NACKPositionConfig() - * is intended to used in I2C mode. - * - * @retval None - */ -void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_PEC_POSITION(I2C_PECPosition)); - if (I2C_PECPosition == I2C_PECPosition_Next) - { - /* Next byte in shift register is PEC */ - I2Cx->CR1 |= I2C_PECPosition_Next; - } - else - { - /* Current byte in shift register is PEC */ - I2Cx->CR1 &= I2C_PECPosition_Current; - } -} - -/** - * @brief Enables or disables the PEC value calculation of the transferred bytes. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2Cx PEC value calculation. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable the selected I2C PEC calculation */ - I2Cx->CR1 |= CR1_ENPEC_Set; - } - else - { - /* Disable the selected I2C PEC calculation */ - I2Cx->CR1 &= CR1_ENPEC_Reset; - } -} - -/** - * @brief Returns the PEC value for the specified I2C. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @retval The PEC value. - */ -uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - /* Return the selected I2C PEC value */ - return ((I2Cx->SR2) >> 8); -} - -/** - * @brief Enables or disables the specified I2C ARP. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2Cx ARP. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState != DISABLE) - { - /* Enable the selected I2C ARP */ - I2Cx->CR1 |= CR1_ENARP_Set; - } - else - { - /* Disable the selected I2C ARP */ - I2Cx->CR1 &= CR1_ENARP_Reset; - } -} - -/** - * @brief Enables or disables the specified I2C Clock stretching. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param NewState: new state of the I2Cx Clock stretching. - * This parameter can be: ENABLE or DISABLE. - * @retval None - */ -void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_FUNCTIONAL_STATE(NewState)); - if (NewState == DISABLE) - { - /* Enable the selected I2C Clock stretching */ - I2Cx->CR1 |= CR1_NOSTRETCH_Set; - } - else - { - /* Disable the selected I2C Clock stretching */ - I2Cx->CR1 &= CR1_NOSTRETCH_Reset; - } -} - -/** - * @brief Selects the specified I2C fast mode duty cycle. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_DutyCycle: specifies the fast mode duty cycle. - * This parameter can be one of the following values: - * @arg I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2 - * @arg I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9 - * @retval None - */ -void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle) -{ - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_DUTY_CYCLE(I2C_DutyCycle)); - if (I2C_DutyCycle != I2C_DutyCycle_16_9) - { - /* I2C fast mode Tlow/Thigh=2 */ - I2Cx->CCR &= I2C_DutyCycle_2; - } - else - { - /* I2C fast mode Tlow/Thigh=16/9 */ - I2Cx->CCR |= I2C_DutyCycle_16_9; - } -} - - - -/** - * @brief - **************************************************************************************** - * - * I2C State Monitoring Functions - * - **************************************************************************************** - * This I2C driver provides three different ways for I2C state monitoring - * depending on the application requirements and constraints: - * - * - * 1) Basic state monitoring: - * Using I2C_CheckEvent() function: - * It compares the status registers (SR1 and SR2) content to a given event - * (can be the combination of one or more flags). - * It returns SUCCESS if the current status includes the given flags - * and returns ERROR if one or more flags are missing in the current status. - * - When to use: - * - This function is suitable for most applications as well as for startup - * activity since the events are fully described in the product reference manual - * (RM0008). - * - It is also suitable for users who need to define their own events. - * - Limitations: - * - If an error occurs (ie. error flags are set besides to the monitored flags), - * the I2C_CheckEvent() function may return SUCCESS despite the communication - * hold or corrupted real state. - * In this case, it is advised to use error interrupts to monitor the error - * events and handle them in the interrupt IRQ handler. - * - * @note - * For error management, it is advised to use the following functions: - * - I2C_ITConfig() to configure and enable the error interrupts (I2C_IT_ERR). - * - I2Cx_ER_IRQHandler() which is called when the error interrupt occurs. - * Where x is the peripheral instance (I2C1, I2C2 ...) - * - I2C_GetFlagStatus() or I2C_GetITStatus() to be called into I2Cx_ER_IRQHandler() - * in order to determine which error occured. - * - I2C_ClearFlag() or I2C_ClearITPendingBit() and/or I2C_SoftwareResetCmd() - * and/or I2C_GenerateStop() in order to clear the error flag and source, - * and return to correct communication status. - * - * - * 2) Advanced state monitoring: - * Using the function I2C_GetLastEvent() which returns the image of both status - * registers in a single word (uint32_t) (Status Register 2 value is shifted left - * by 16 bits and concatenated to Status Register 1). - * - When to use: - * - This function is suitable for the same applications above but it allows to - * overcome the mentioned limitation of I2C_GetFlagStatus() function. - * The returned value could be compared to events already defined in the - * library (stm32f10x_i2c.h) or to custom values defined by user. - * - This function is suitable when multiple flags are monitored at the same time. - * - At the opposite of I2C_CheckEvent() function, this function allows user to - * choose when an event is accepted (when all events flags are set and no - * other flags are set or just when the needed flags are set like - * I2C_CheckEvent() function). - * - Limitations: - * - User may need to define his own events. - * - Same remark concerning the error management is applicable for this - * function if user decides to check only regular communication flags (and - * ignores error flags). - * - * - * 3) Flag-based state monitoring: - * Using the function I2C_GetFlagStatus() which simply returns the status of - * one single flag (ie. I2C_FLAG_RXNE ...). - * - When to use: - * - This function could be used for specific applications or in debug phase. - * - It is suitable when only one flag checking is needed (most I2C events - * are monitored through multiple flags). - * - Limitations: - * - When calling this function, the Status register is accessed. Some flags are - * cleared when the status register is accessed. So checking the status - * of one Flag, may clear other ones. - * - Function may need to be called twice or more in order to monitor one - * single event. - * - * For detailed description of Events, please refer to section I2C_Events in - * stm32f10x_i2c.h file. - * - */ - -/** - * - * 1) Basic state monitoring - ******************************************************************************* - */ - -/** - * @brief Checks whether the last I2Cx Event is equal to the one passed - * as parameter. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_EVENT: specifies the event to be checked. - * This parameter can be one of the following values: - * @arg I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED : EV1 - * @arg I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED : EV1 - * @arg I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED : EV1 - * @arg I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED : EV1 - * @arg I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED : EV1 - * @arg I2C_EVENT_SLAVE_BYTE_RECEIVED : EV2 - * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF) : EV2 - * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL) : EV2 - * @arg I2C_EVENT_SLAVE_BYTE_TRANSMITTED : EV3 - * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF) : EV3 - * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL) : EV3 - * @arg I2C_EVENT_SLAVE_ACK_FAILURE : EV3_2 - * @arg I2C_EVENT_SLAVE_STOP_DETECTED : EV4 - * @arg I2C_EVENT_MASTER_MODE_SELECT : EV5 - * @arg I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED : EV6 - * @arg I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED : EV6 - * @arg I2C_EVENT_MASTER_BYTE_RECEIVED : EV7 - * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTING : EV8 - * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTED : EV8_2 - * @arg I2C_EVENT_MASTER_MODE_ADDRESS10 : EV9 - * - * @note: For detailed description of Events, please refer to section - * I2C_Events in stm32f10x_i2c.h file. - * - * @retval An ErrorStatus enumeration value: - * - SUCCESS: Last event is equal to the I2C_EVENT - * - ERROR: Last event is different from the I2C_EVENT - */ -ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT) -{ - uint32_t lastevent = 0; - uint32_t flag1 = 0, flag2 = 0; - ErrorStatus status = ERROR; - - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_EVENT(I2C_EVENT)); - - /* Read the I2Cx status register */ - flag1 = I2Cx->SR1; - flag2 = I2Cx->SR2; - flag2 = flag2 << 16; - - /* Get the last event value from I2C status register */ - lastevent = (flag1 | flag2) & FLAG_Mask; - - /* Check whether the last event contains the I2C_EVENT */ - if ((lastevent & I2C_EVENT) == I2C_EVENT) - { - /* SUCCESS: last event is equal to I2C_EVENT */ - status = SUCCESS; - } - else - { - /* ERROR: last event is different from I2C_EVENT */ - status = ERROR; - } - /* Return status */ - return status; -} - -/** - * - * 2) Advanced state monitoring - ******************************************************************************* - */ - -/** - * @brief Returns the last I2Cx Event. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * - * @note: For detailed description of Events, please refer to section - * I2C_Events in stm32f10x_i2c.h file. - * - * @retval The last event - */ -uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx) -{ - uint32_t lastevent = 0; - uint32_t flag1 = 0, flag2 = 0; - - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - - /* Read the I2Cx status register */ - flag1 = I2Cx->SR1; - flag2 = I2Cx->SR2; - flag2 = flag2 << 16; - - /* Get the last event value from I2C status register */ - lastevent = (flag1 | flag2) & FLAG_Mask; - - /* Return status */ - return lastevent; -} - -/** - * - * 3) Flag-based state monitoring - ******************************************************************************* - */ - -/** - * @brief Checks whether the specified I2C flag is set or not. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_FLAG: specifies the flag to check. - * This parameter can be one of the following values: - * @arg I2C_FLAG_DUALF: Dual flag (Slave mode) - * @arg I2C_FLAG_SMBHOST: SMBus host header (Slave mode) - * @arg I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode) - * @arg I2C_FLAG_GENCALL: General call header flag (Slave mode) - * @arg I2C_FLAG_TRA: Transmitter/Receiver flag - * @arg I2C_FLAG_BUSY: Bus busy flag - * @arg I2C_FLAG_MSL: Master/Slave flag - * @arg I2C_FLAG_SMBALERT: SMBus Alert flag - * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag - * @arg I2C_FLAG_PECERR: PEC error in reception flag - * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode) - * @arg I2C_FLAG_AF: Acknowledge failure flag - * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode) - * @arg I2C_FLAG_BERR: Bus error flag - * @arg I2C_FLAG_TXE: Data register empty flag (Transmitter) - * @arg I2C_FLAG_RXNE: Data register not empty (Receiver) flag - * @arg I2C_FLAG_STOPF: Stop detection flag (Slave mode) - * @arg I2C_FLAG_ADD10: 10-bit header sent flag (Master mode) - * @arg I2C_FLAG_BTF: Byte transfer finished flag - * @arg I2C_FLAG_ADDR: Address sent flag (Master mode) "ADSL" - * Address matched flag (Slave mode)"ENDA" - * @arg I2C_FLAG_SB: Start bit flag (Master mode) - * @retval The new state of I2C_FLAG (SET or RESET). - */ -FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG) -{ - FlagStatus bitstatus = RESET; - __IO uint32_t i2creg = 0, i2cxbase = 0; - - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_GET_FLAG(I2C_FLAG)); - - /* Get the I2Cx peripheral base address */ - i2cxbase = (uint32_t)I2Cx; - - /* Read flag register index */ - i2creg = I2C_FLAG >> 28; - - /* Get bit[23:0] of the flag */ - I2C_FLAG &= FLAG_Mask; - - if(i2creg != 0) - { - /* Get the I2Cx SR1 register address */ - i2cxbase += 0x14; - } - else - { - /* Flag in I2Cx SR2 Register */ - I2C_FLAG = (uint32_t)(I2C_FLAG >> 16); - /* Get the I2Cx SR2 register address */ - i2cxbase += 0x18; - } - - if(((*(__IO uint32_t *)i2cxbase) & I2C_FLAG) != (uint32_t)RESET) - { - /* I2C_FLAG is set */ - bitstatus = SET; - } - else - { - /* I2C_FLAG is reset */ - bitstatus = RESET; - } - - /* Return the I2C_FLAG status */ - return bitstatus; -} - - - -/** - * @brief Clears the I2Cx's pending flags. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_FLAG: specifies the flag to clear. - * This parameter can be any combination of the following values: - * @arg I2C_FLAG_SMBALERT: SMBus Alert flag - * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag - * @arg I2C_FLAG_PECERR: PEC error in reception flag - * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode) - * @arg I2C_FLAG_AF: Acknowledge failure flag - * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode) - * @arg I2C_FLAG_BERR: Bus error flag - * - * @note - * - STOPF (STOP detection) is cleared by software sequence: a read operation - * to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation - * to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral). - * - ADD10 (10-bit header sent) is cleared by software sequence: a read - * operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the - * second byte of the address in DR register. - * - BTF (Byte Transfer Finished) is cleared by software sequence: a read - * operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a - * read/write to I2C_DR register (I2C_SendData()). - * - ADDR (Address sent) is cleared by software sequence: a read operation to - * I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to - * I2C_SR2 register ((void)(I2Cx->SR2)). - * - SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1 - * register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR - * register (I2C_SendData()). - * @retval None - */ -void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG) -{ - uint32_t flagpos = 0; - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG)); - /* Get the I2C flag position */ - flagpos = I2C_FLAG & FLAG_Mask; - /* Clear the selected I2C flag */ - I2Cx->SR1 = (uint16_t)~flagpos; -} - -/** - * @brief Checks whether the specified I2C interrupt has occurred or not. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_IT: specifies the interrupt source to check. - * This parameter can be one of the following values: - * @arg I2C_IT_SMBALERT: SMBus Alert flag - * @arg I2C_IT_TIMEOUT: Timeout or Tlow error flag - * @arg I2C_IT_PECERR: PEC error in reception flag - * @arg I2C_IT_OVR: Overrun/Underrun flag (Slave mode) - * @arg I2C_IT_AF: Acknowledge failure flag - * @arg I2C_IT_ARLO: Arbitration lost flag (Master mode) - * @arg I2C_IT_BERR: Bus error flag - * @arg I2C_IT_TXE: Data register empty flag (Transmitter) - * @arg I2C_IT_RXNE: Data register not empty (Receiver) flag - * @arg I2C_IT_STOPF: Stop detection flag (Slave mode) - * @arg I2C_IT_ADD10: 10-bit header sent flag (Master mode) - * @arg I2C_IT_BTF: Byte transfer finished flag - * @arg I2C_IT_ADDR: Address sent flag (Master mode) "ADSL" - * Address matched flag (Slave mode)"ENDAD" - * @arg I2C_IT_SB: Start bit flag (Master mode) - * @retval The new state of I2C_IT (SET or RESET). - */ -ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT) -{ - ITStatus bitstatus = RESET; - uint32_t enablestatus = 0; - - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_GET_IT(I2C_IT)); - - /* Check if the interrupt source is enabled or not */ - enablestatus = (uint32_t)(((I2C_IT & ITEN_Mask) >> 16) & (I2Cx->CR2)) ; - - /* Get bit[23:0] of the flag */ - I2C_IT &= FLAG_Mask; - - /* Check the status of the specified I2C flag */ - if (((I2Cx->SR1 & I2C_IT) != (uint32_t)RESET) && enablestatus) - { - /* I2C_IT is set */ - bitstatus = SET; - } - else - { - /* I2C_IT is reset */ - bitstatus = RESET; - } - /* Return the I2C_IT status */ - return bitstatus; -} - -/** - * @brief Clears the I2Cx’s interrupt pending bits. - * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral. - * @param I2C_IT: specifies the interrupt pending bit to clear. - * This parameter can be any combination of the following values: - * @arg I2C_IT_SMBALERT: SMBus Alert interrupt - * @arg I2C_IT_TIMEOUT: Timeout or Tlow error interrupt - * @arg I2C_IT_PECERR: PEC error in reception interrupt - * @arg I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode) - * @arg I2C_IT_AF: Acknowledge failure interrupt - * @arg I2C_IT_ARLO: Arbitration lost interrupt (Master mode) - * @arg I2C_IT_BERR: Bus error interrupt - * - * @note - * - STOPF (STOP detection) is cleared by software sequence: a read operation - * to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to - * I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral). - * - ADD10 (10-bit header sent) is cleared by software sequence: a read - * operation to I2C_SR1 (I2C_GetITStatus()) followed by writing the second - * byte of the address in I2C_DR register. - * - BTF (Byte Transfer Finished) is cleared by software sequence: a read - * operation to I2C_SR1 register (I2C_GetITStatus()) followed by a - * read/write to I2C_DR register (I2C_SendData()). - * - ADDR (Address sent) is cleared by software sequence: a read operation to - * I2C_SR1 register (I2C_GetITStatus()) followed by a read operation to - * I2C_SR2 register ((void)(I2Cx->SR2)). - * - SB (Start Bit) is cleared by software sequence: a read operation to - * I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to - * I2C_DR register (I2C_SendData()). - * @retval None - */ -void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT) -{ - uint32_t flagpos = 0; - /* Check the parameters */ - assert_param(IS_I2C_ALL_PERIPH(I2Cx)); - assert_param(IS_I2C_CLEAR_IT(I2C_IT)); - /* Get the I2C flag position */ - flagpos = I2C_IT & FLAG_Mask; - /* Clear the selected I2C flag */ - I2Cx->SR1 = (uint16_t)~flagpos; -} - -/** - * @} - */ - -/** - * @} - */ - -/** - * @} - */ - -/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/ |