From b2ebb161d494864cdbee05ee8b74a775845e238e Mon Sep 17 00:00:00 2001 From: Damien George Date: Sun, 19 Jan 2014 17:40:35 +0000 Subject: stm: Upgrade ST peripheral library from 1.1.0 to 1.3.0. --- stm/lib/stm32f4xx_i2c.c | 1462 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1462 insertions(+) create mode 100644 stm/lib/stm32f4xx_i2c.c (limited to 'stm/lib/stm32f4xx_i2c.c') diff --git a/stm/lib/stm32f4xx_i2c.c b/stm/lib/stm32f4xx_i2c.c new file mode 100644 index 0000000000..4580c0dd77 --- /dev/null +++ b/stm/lib/stm32f4xx_i2c.c @@ -0,0 +1,1462 @@ +/** + ****************************************************************************** + * @file stm32f4xx_i2c.c + * @author MCD Application Team + * @version V1.3.0 + * @date 08-November-2013 + * @brief This file provides firmware functions to manage the following + * functionalities of the Inter-integrated circuit (I2C) + * + Initialization and Configuration + * + Data transfers + * + PEC management + * + DMA transfers management + * + Interrupts, events and flags management + * + @verbatim + =============================================================================== + ##### How to use this driver ##### + =============================================================================== + [..] + (#) Enable peripheral clock using RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2Cx, ENABLE) + function for I2C1, I2C2 or I2C3. + + (#) Enable SDA, SCL and SMBA (when used) GPIO clocks using + RCC_AHBPeriphClockCmd() function. + + (#) Peripherals alternate function: + (++) Connect the pin to the desired peripherals' Alternate + Function (AF) using GPIO_PinAFConfig() function + (++) Configure the desired pin in alternate function by: + GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF + (++) Select the type, pull-up/pull-down and output speed via + GPIO_PuPd, GPIO_OType and GPIO_Speed members + (++) Call GPIO_Init() function + Recommended configuration is Push-Pull, Pull-up, Open-Drain. + Add an external pull up if necessary (typically 4.7 KOhm). + + (#) Program the Mode, duty cycle , Own address, Ack, Speed and Acknowledged + Address using the I2C_Init() function. + + (#) Optionally you can enable/configure the following parameters without + re-initialization (i.e there is no need to call again I2C_Init() function): + (++) Enable the acknowledge feature using I2C_AcknowledgeConfig() function + (++) Enable the dual addressing mode using I2C_DualAddressCmd() function + (++) Enable the general call using the I2C_GeneralCallCmd() function + (++) Enable the clock stretching using I2C_StretchClockCmd() function + (++) Enable the fast mode duty cycle using the I2C_FastModeDutyCycleConfig() + function. + (++) Configure the NACK position for Master Receiver mode in case of + 2 bytes reception using the function I2C_NACKPositionConfig(). + (++) Enable the PEC Calculation using I2C_CalculatePEC() function + (++) For SMBus Mode: + (+++) Enable the Address Resolution Protocol (ARP) using I2C_ARPCmd() function + (+++) Configure the SMBusAlert pin using I2C_SMBusAlertConfig() function + + (#) Enable the NVIC and the corresponding interrupt using the function + I2C_ITConfig() if you need to use interrupt mode. + + (#) When using the DMA mode + (++) Configure the DMA using DMA_Init() function + (++) Active the needed channel Request using I2C_DMACmd() or + I2C_DMALastTransferCmd() function. + -@@- When using DMA mode, I2C interrupts may be used at the same time to + control the communication flow (Start/Stop/Ack... events and errors). + + (#) Enable the I2C using the I2C_Cmd() function. + + (#) Enable the DMA using the DMA_Cmd() function when using DMA mode in the + transfers. + + @endverbatim + ****************************************************************************** + * @attention + * + *

© COPYRIGHT 2013 STMicroelectronics

+ * + * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); + * You may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.st.com/software_license_agreement_liberty_v2 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + ****************************************************************************** + */ + +/* Includes ------------------------------------------------------------------*/ +#include "stm32f4xx_i2c.h" +#include "stm32f4xx_rcc.h" + +/** @addtogroup STM32F4xx_StdPeriph_Driver + * @{ + */ + +/** @defgroup I2C + * @brief I2C driver modules + * @{ + */ + +/* Private typedef -----------------------------------------------------------*/ +/* Private define ------------------------------------------------------------*/ + +#define CR1_CLEAR_MASK ((uint16_t)0xFBF5) /*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 &= (uint16_t)~((uint16_t)I2C_CR2_FREQ); + /* 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 &= (uint16_t)~((uint16_t)I2C_CR1_PE); + /* 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 */ + /* To use the I2C at 400 KHz (in fast mode), the PCLK1 frequency (I2C peripheral + input clock) must be a multiple of 10 MHz */ + 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 & I2C_CCR_CCR) == 0) + { + /* Set minimum allowed value */ + result |= (uint16_t)0x0001; + } + /* Set speed value and set F/S bit for fast mode */ + tmpreg |= (uint16_t)(result | I2C_CCR_FS); + /* 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 |= I2C_CR1_PE; + +/*---------------------------- 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, 2 or 3 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 |= I2C_CR1_PE; + } + else + { + /* Disable the selected I2C peripheral */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PE); + } +} + +/** + * @brief Enables or disables the Analog filter of I2C peripheral. + * + * @note This function can be used only for STM32F42xxx/STM3243xxx and STM32F401xx devices. + * + * @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral. + * @param NewState: new state of the Analog filter. + * This parameter can be: ENABLE or DISABLE. + * @note This function should be called before initializing and enabling + the I2C Peripheral. + * @retval None + */ +void I2C_AnalogFilterCmd(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 analog filter */ + I2Cx->FLTR &= (uint16_t)~((uint16_t)I2C_FLTR_ANOFF); + } + else + { + /* Disable the analog filter */ + I2Cx->FLTR |= I2C_FLTR_ANOFF; + } +} + +/** + * @brief Configures the Digital noise filter of I2C peripheral. + * + * @note This function can be used only for STM32F42xxx/STM3243xxx and STM32F401xx devices. + * + * @param I2Cx: where x can be 1, 2 or 3 to select the I2C peripheral. + * @param I2C_DigitalFilter: Coefficient of digital noise filter. + * This parameter can be a number between 0x00 and 0x0F. + * @note This function should be called before initializing and enabling + the I2C Peripheral. + * @retval None + */ +void I2C_DigitalFilterConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DigitalFilter) +{ + uint16_t tmpreg = 0; + + /* Check the parameters */ + assert_param(IS_I2C_ALL_PERIPH(I2Cx)); + assert_param(IS_I2C_DIGITAL_FILTER(I2C_DigitalFilter)); + + /* Get the old register value */ + tmpreg = I2Cx->FLTR; + + /* Reset I2Cx DNF bit [3:0] */ + tmpreg &= (uint16_t)~((uint16_t)I2C_FLTR_DNF); + + /* Set I2Cx DNF coefficient */ + tmpreg |= (uint16_t)((uint16_t)I2C_DigitalFilter & I2C_FLTR_DNF); + + /* Store the new register value */ + I2Cx->FLTR = tmpreg; +} + +/** + * @brief Generates I2Cx communication START condition. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_START; + } + else + { + /* Disable the START condition generation */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_START); + } +} + +/** + * @brief Generates I2Cx communication STOP condition. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_STOP; + } + else + { + /* Disable the STOP condition generation */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_STOP); + } +} + +/** + * @brief Transmits the address byte to select the slave device. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_OAR1_ADD0; + } + else + { + /* Reset the address bit0 for write */ + Address &= (uint8_t)~((uint8_t)I2C_OAR1_ADD0); + } + /* Send the address */ + I2Cx->DR = Address; +} + +/** + * @brief Enables or disables the specified I2C acknowledge feature. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_ACK; + } + else + { + /* Disable the acknowledgement */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ACK); + } +} + +/** + * @brief Configures the specified I2C own address2. + * @param I2Cx: where x can be 1, 2 or 3 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 &= (uint16_t)~((uint16_t)I2C_OAR2_ADD2); + + /* 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, 2 or 3 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 |= I2C_OAR2_ENDUAL; + } + else + { + /* Disable dual addressing mode */ + I2Cx->OAR2 &= (uint16_t)~((uint16_t)I2C_OAR2_ENDUAL); + } +} + +/** + * @brief Enables or disables the specified I2C general call feature. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_ENGC; + } + else + { + /* Disable generall call */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENGC); + } +} + +/** + * @brief Enables or disables the specified I2C software reset. + * @note When software reset is enabled, the I2C IOs are released (this can + * be useful to recover from bus errors). + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_SWRST; + } + else + { + /* Peripheral not under reset */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_SWRST); + } +} + +/** + * @brief Enables or disables the specified I2C Clock stretching. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_NOSTRETCH; + } + else + { + /* Disable the selected I2C Clock stretching */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_NOSTRETCH); + } +} + +/** + * @brief Selects the specified I2C fast mode duty cycle. + * @param I2Cx: where x can be 1, 2 or 3 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 Selects the specified I2C NACK position in master receiver mode. + * @note 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, 2 or 3 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, 2 or 3 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 ARP. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_ENARP; + } + else + { + /* Disable the selected I2C ARP */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENARP); + } +} +/** + * @} + */ + +/** @defgroup I2C_Group2 Data transfers functions + * @brief Data transfers functions + * +@verbatim + =============================================================================== + ##### Data transfers functions ##### + =============================================================================== + +@endverbatim + * @{ + */ + +/** + * @brief Sends a data byte through the I2Cx peripheral. + * @param I2Cx: where x can be 1, 2 or 3 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, 2 or 3 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; +} + +/** + * @} + */ + +/** @defgroup I2C_Group3 PEC management functions + * @brief PEC management functions + * +@verbatim + =============================================================================== + ##### PEC management functions ##### + =============================================================================== + +@endverbatim + * @{ + */ + +/** + * @brief Enables or disables the specified I2C PEC transfer. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR1_PEC; + } + else + { + /* Disable the selected I2C PEC transmission */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_PEC); + } +} + +/** + * @brief Selects the specified I2C PEC position. + * @param I2Cx: where x can be 1, 2 or 3 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, 2 or 3 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 |= I2C_CR1_ENPEC; + } + else + { + /* Disable the selected I2C PEC calculation */ + I2Cx->CR1 &= (uint16_t)~((uint16_t)I2C_CR1_ENPEC); + } +} + +/** + * @brief Returns the PEC value for the specified I2C. + * @param I2Cx: where x can be 1, 2 or 3 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); +} + +/** + * @} + */ + +/** @defgroup I2C_Group4 DMA transfers management functions + * @brief DMA transfers management functions + * +@verbatim + =============================================================================== + ##### DMA transfers management functions ##### + =============================================================================== + This section provides functions allowing to configure the I2C DMA channels + requests. + +@endverbatim + * @{ + */ + +/** + * @brief Enables or disables the specified I2C DMA requests. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR2_DMAEN; + } + else + { + /* Disable the selected I2C DMA requests */ + I2Cx->CR2 &= (uint16_t)~((uint16_t)I2C_CR2_DMAEN); + } +} + +/** + * @brief Specifies that the next DMA transfer is the last one. + * @param I2Cx: where x can be 1, 2 or 3 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 |= I2C_CR2_LAST; + } + else + { + /* Next DMA transfer is not the last transfer */ + I2Cx->CR2 &= (uint16_t)~((uint16_t)I2C_CR2_LAST); + } +} + +/** + * @} + */ + +/** @defgroup I2C_Group5 Interrupts events and flags management functions + * @brief Interrupts, events and flags management functions + * +@verbatim + =============================================================================== + ##### Interrupts, events and flags management functions ##### + =============================================================================== + [..] + This section provides functions allowing to configure the I2C Interrupts + sources and check or clear the flags or pending bits status. + The user should identify which mode will be used in his application to manage + the communication: Polling mode, Interrupt mode or DMA mode. + + + ##### I2C State Monitoring Functions ##### + =============================================================================== + [..] + This I2C driver provides three different ways for I2C state monitoring + depending on the application requirements and constraints: + + + (#) 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 (RM0090). + (+++) 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. + + -@@- 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 the + I2Cx_ER_IRQHandler() function in order to determine which error occurred. + (+@@) 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. + + + (#) Advanced state monitoring (Using the function I2C_GetLastEvent()) + + 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 (stm32f4xx_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). + + + (#) Flag-based state monitoring (Using the function I2C_GetFlagStatus()) + + 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 + stm32f4xx_i2c.h file. + +@endverbatim + * @{ + */ + +/** + * @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 interrupts. + * @param I2Cx: where x can be 1, 2 or 3 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; + } +} + +/* + =============================================================================== + 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, 2 or 3 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 stm32f4xx_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, 2 or 3 to select the I2C peripheral. + * + * @note For detailed description of Events, please refer to section I2C_Events + * in stm32f4xx_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, 2 or 3 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)"ENDAD" + * @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, 2 or 3 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). + * @note 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. + * @note 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()). + * @note 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)). + * @note 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, 2 or 3 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, 2 or 3 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). + * @note 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. + * @note 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()). + * @note 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)). + * @note 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 STMicroelectronics *****END OF FILE****/ -- cgit v1.2.3