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/**
******************************************************************************
* @file Examples_LL/I2C/I2C_OneBoard_Communication_IT_Init/Src/main.c
* @author MCD Application Team
* @brief This example describes how to send/receive bytes over I2C IP using
* the STM32F4xx I2C LL API.
* Peripheral initialization done using LL initialization function.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup I2C_OneBoard_Communication_IT_Init
* @{
*/
/* Private typedef -----------------------------------------------------------*/
LL_I2C_InitTypeDef i2c_initstruct;
/* Private define ------------------------------------------------------------*/
/**
* @brief I2C devices settings
*/
/* I2C SPEEDCLOCK define to max value: 400 KHz */
#define I2C_SPEEDCLOCK 400000
#define I2C_DUTYCYCLE LL_I2C_DUTYCYCLE_2
/**
* @brief Define related to SlaveTransmit process
*/
#define SLAVE_BYTE_TO_SEND (uint8_t)0xA5
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint8_t ubNbDataToTransmit = sizeof(SLAVE_BYTE_TO_SEND);
__IO uint8_t ubNbDataToReceive = sizeof(SLAVE_BYTE_TO_SEND);
__IO uint8_t ubButtonPress = 0;
/**
* @brief Variables related to MasterReceive process
*/
uint8_t aReceiveBuffer[0xF] = {0};
__IO uint8_t ubReceiveIndex = 0;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Configure_I2C_Slave(void);
void Configure_I2C_Master(void);
void Activate_I2C_Slave(void);
void Activate_I2C_Master(void);
void LED_Init(void);
void LED_On(void);
void LED_Off(void);
void LED_Blinking(uint32_t Period);
void WaitForUserButtonPress(void);
void Handle_I2C_Slave(void);
void Handle_I2C_Master(void);
void UserButton_Init(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Set LED2 Off */
LED_Off();
/* Initialize User push-button in EXTI mode */
UserButton_Init();
/* Configure I2C1 (I2C IP configuration in Slave mode and related GPIO initialization) */
Configure_I2C_Slave();
/* Configure I2C2 (I2C IP configuration in Master mode and related GPIO initialization) */
Configure_I2C_Master();
/* Enable the I2C1 peripheral (Slave) */
Activate_I2C_Slave();
/* Enable the I2C2 peripheral (Master) */
Activate_I2C_Master();
/* Wait for User push-button press to start transfer */
WaitForUserButtonPress();
/* Handle I2C1 events (Slave) */
Handle_I2C_Slave();
/* Handle I2C2 events (Master) */
Handle_I2C_Master();
/* Infinite loop */
while (1)
{
}
}
/**
* @brief This function configures I2C1 in Slave mode.
* @note This function is used to :
* -1- Enables GPIO clock and configures the I2C1 pins.
* -2- Enable the I2C1 peripheral clock.
* -3- Configure NVIC for I2C1.
* -4- Configure and Enable I2C1 functional parameters.
* -5- Disable I2C1 (to prevent misplaced start/stop condition during
* GPIO initialization phase on Master side).
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_I2C_Slave(void)
{
/* (1) Enables GPIO clock and configures the I2C1 pins **********************/
/* (SCL on PB.6, SDA on PB.7) **********************/
/* Enable the peripheral clock of GPIOB */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);
/* Configure SCL Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_6, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_0_7(GPIOB, LL_GPIO_PIN_6, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_6, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_6, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_6, LL_GPIO_PULL_UP);
/* Configure SDA Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_7, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_0_7(GPIOB, LL_GPIO_PIN_7, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_7, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_7, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_7, LL_GPIO_PULL_UP);
/* (2) Enable the I2C1 peripheral clock *************************************/
/* Enable the peripheral clock for I2C1 */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C1);
/* (3) Configure NVIC for I2C1 **********************************************/
/* Configure Event IT:
* - Set priority for I2C1_EV_IRQn
* - Enable I2C1_EV_IRQn
*/
NVIC_SetPriority(I2C1_EV_IRQn, 0);
NVIC_EnableIRQ(I2C1_EV_IRQn);
/* Configure Error IT:
* - Set priority for I2C1_ER_IRQn
* - Enable I2C1_ER_IRQn
*/
NVIC_SetPriority(I2C1_ER_IRQn, 0);
NVIC_EnableIRQ(I2C1_ER_IRQn);
/* (4) Configure I2C1 functional parameters ***********************/
/* Reset I2C1 data registers */
if (LL_I2C_DeInit(I2C1) != SUCCESS)
{
/* Initialization Error */
LED_Blinking(LED_BLINK_ERROR);
}
/* Enable Clock stretching */
/* Reset Value is Clock stretching enabled */
//LL_I2C_EnableClockStretching(I2C1);
/* Enable General Call */
/* Reset Value is General Call disabled */
//LL_I2C_EnableGeneralCall(I2C1);
/* Configure the 7bits Own Address2 */
/* Reset Values of :
* - OwnAddress2 is 0x00
* - Own Address2 is disabled
*/
//LL_I2C_SetOwnAddress2(I2C1, 0x00);
//LL_I2C_DisableOwnAddress2(I2C1);
/* Enable Peripheral in I2C mode */
/* Reset Value is I2C mode */
//LL_I2C_SetMode(I2C1, LL_I2C_MODE_I2C);
/* Set fields of initialization structure:
* - Peripheral Mode = Mode I2C
* - Clock Speed = fast Mode @400kHz
* - Duty Cycle = fast mode duty cycle tlow/thigh = 2
* - Own Address1 = SLAVE_OWN_ADDRESS
* - Type of Acknowledge = Acknowledge bytes/address received
* - Own Address 1 Size = Slave Address in 7-bit
*/
i2c_initstruct.PeripheralMode = LL_I2C_MODE_I2C;
i2c_initstruct.ClockSpeed = I2C_SPEEDCLOCK;
i2c_initstruct.DutyCycle = I2C_DUTYCYCLE;
i2c_initstruct.OwnAddress1 = SLAVE_OWN_ADDRESS;
i2c_initstruct.TypeAcknowledge = LL_I2C_ACK;
i2c_initstruct.OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
/* Initialize I2C instance according to parameters defined in initialization structure. */
if (LL_I2C_Init(I2C1, &i2c_initstruct) != SUCCESS)
{
/* Initialization Error */
LED_Blinking(LED_BLINK_ERROR);
}
/* Disable I2C1 (to prevent misplaced start/stop condition during
* GPIO initialization phase on Master side)
*/
LL_I2C_Disable(I2C1);
}
/**
* @brief This function configures I2C2 in Master mode.
* @note This function is used to :
* -1- Enables GPIO clock and configures the I2C2 pins.
* -2- Enable the I2C2 peripheral clock.
* -3- Configure NVIC for I2C2.
* -4- Configure and Enable I2C2 functional parameters.
* -5- Disable I2C2 (to prevent misplaced start/stop condition during
* GPIO initialization phase on Slave side).
* @note Peripheral configuration is minimal configuration from reset values.
* Thus, some useless LL unitary functions calls below are provided as
* commented examples - setting is default configuration from reset.
* @param None
* @retval None
*/
void Configure_I2C_Master(void)
{
/* (1) Enables GPIO clock and configures the I2C2 pins **********************/
/* (SCL on PB.10, SDA on PB.3) **********************/
/* Enable the peripheral clock of GPIOB */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOB);
/* Configure SCL Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_10, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_10, LL_GPIO_AF_4);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_10, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_10, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_10, LL_GPIO_PULL_UP);
/* Configure SDA Pin as : Alternate function, High Speed, Open drain, Pull up */
LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_3, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetAFPin_0_7(GPIOB, LL_GPIO_PIN_3, LL_GPIO_AF_9);
LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_3, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinOutputType(GPIOB, LL_GPIO_PIN_3, LL_GPIO_OUTPUT_OPENDRAIN);
LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_3, LL_GPIO_PULL_UP);
/* (2) Enable the I2C2 peripheral clock *************************************/
/* Enable the peripheral clock for I2C2 */
LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C2);
/* (3) Configure NVIC for I2C2 **********************************************/
/* Configure Event IT:
* - Set priority for I2C2_EV_IRQn
* - Enable I2C2_EV_IRQn
*/
NVIC_SetPriority(I2C2_EV_IRQn, 0);
NVIC_EnableIRQ(I2C2_EV_IRQn);
/* Configure Error IT:
* - Set priority for I2C2_ER_IRQn
* - Enable I2C2_ER_IRQn
*/
NVIC_SetPriority(I2C2_ER_IRQn, 0);
NVIC_EnableIRQ(I2C2_ER_IRQn);
/* (4) Configure I2C2 functional parameters ********************************/
/* Reset I2C2 data registers */
if (LL_I2C_DeInit(I2C2) != SUCCESS)
{
/* Initialization Error */
LED_Blinking(LED_BLINK_ERROR);
}
/* Configure the Own Address1 */
/* Reset Values of :
* - OwnAddress1 is 0x00
* - OwnAddrSize is LL_I2C_OWNADDRESS1_7BIT
*/
//LL_I2C_SetOwnAddress1(I2C2, 0x00, LL_I2C_OWNADDRESS1_7BIT);
/* Enable Clock stretching */
/* Reset Value is Clock stretching enabled */
//LL_I2C_EnableClockStretching(I2C2);
/* Enable General Call */
/* Reset Value is General Call disabled */
//LL_I2C_EnableGeneralCall(I2C2);
/* Configure the 7bits Own Address2 */
/* Reset Values of :
* - OwnAddress2 is 0x00
* - Own Address2 is disabled
*/
//LL_I2C_SetOwnAddress2(I2C2, 0x00);
//LL_I2C_DisableOwnAddress2(I2C2);
/* Enable Peripheral in I2C mode */
/* Reset Value is I2C mode */
//LL_I2C_SetMode(I2C2, LL_I2C_MODE_I2C);
/* Set fields of initialization structure:
* - Peripheral Mode = Mode I2C
* - Clock Speed = fast Mode @400kHz
* - Duty Cycle = fast mode duty cycle tlow/thigh = 2
* - Own Address1 = SLAVE_OWN_ADDRESS
* - Type of Acknowledge = Acknowledge bytes/address received
* - Own Address 1 Size = Slave Address in 7-bit
*/
i2c_initstruct.PeripheralMode = LL_I2C_MODE_I2C;
i2c_initstruct.ClockSpeed = I2C_SPEEDCLOCK;
i2c_initstruct.DutyCycle = I2C_DUTYCYCLE;
i2c_initstruct.OwnAddress1 = 0x00;
i2c_initstruct.TypeAcknowledge = LL_I2C_ACK;
i2c_initstruct.OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
/* Initialize I2C instance according to parameters defined in initialization structure. */
if (LL_I2C_Init(I2C2, &i2c_initstruct) != SUCCESS)
{
/* Initialization Error */
LED_Blinking(LED_BLINK_ERROR);
}
/* Disable I2C2 (to prevent misplaced start/stop condition during
* GPIO initialization phase on Master side)
*/
LL_I2C_Disable(I2C2);
}
/**
* @brief This function Activate I2C1 peripheral (Slave)
* @note This function is used to :
* -1- Enable I2C1.
* -2- Enable I2C1 transfer event/error interrupts.
* @param None
* @retval None
*/
void Activate_I2C_Slave(void)
{
/* (1) Enable I2C1 **********************************************************/
LL_I2C_Enable(I2C1);
/* (2) Enable I2C1 transfer event/error interrupts:
* - Enable Events interrupts
* - Enable Errors interrupts
*/
LL_I2C_EnableIT_EVT(I2C1);
LL_I2C_EnableIT_ERR(I2C1);
}
/**
* @brief This function Activate I2C2 peripheral (Master)
* @note This function is used to :
* -1- Enable I2C2.
* -2- Enable I2C2 transfer event/error interrupts.
* @param None
* @retval None
*/
void Activate_I2C_Master(void)
{
/* (1) Enable I2C2 **********************************************************/
LL_I2C_Enable(I2C2);
/* (2) Enable I2C2 transfer event/error interrupts:
* - Enable Events interrupts
* - Enable Errors interrupts
*/
LL_I2C_EnableIT_EVT(I2C2);
LL_I2C_EnableIT_ERR(I2C2);
}
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED2 Clock */
LED2_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED2 */
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
/* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
//LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
/* Reset value is LL_GPIO_SPEED_FREQ_LOW */
//LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
/* Reset value is LL_GPIO_PULL_NO */
//LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
}
/**
* @brief Turn-on LED2.
* @param None
* @retval None
*/
void LED_On(void)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @brief Turn-off LED2.
* @param None
* @retval None
*/
void LED_Off(void)
{
/* Turn LED2 off */
LL_GPIO_ResetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @brief Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
* @param Period : Period of time (in ms) between each toggling of LED
* This parameter can be user defined values. Pre-defined values used in that example are :
* @arg LED_BLINK_FAST : Fast Blinking
* @arg LED_BLINK_SLOW : Slow Blinking
* @arg LED_BLINK_ERROR : Error specific Blinking
* @retval None
*/
void LED_Blinking(uint32_t Period)
{
/* Turn LED2 on */
LL_GPIO_SetOutputPin(LED2_GPIO_PORT, LED2_PIN);
/* Toggle IO in an infinite loop */
while (1)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(Period);
}
}
/**
* @brief Configures User push-button in GPIO or EXTI Line Mode.
* @param None
* @retval None
*/
void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Connect External Line to the GPIO*/
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger External line 13 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
}
/**
* @brief Wait for User push-button press to start transfer.
* @param None
* @retval None
*/
/* */
void WaitForUserButtonPress(void)
{
while (ubButtonPress == 0)
{
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
LL_mDelay(LED_BLINK_FAST);
}
/* Turn LED2 off */
LL_GPIO_ResetOutputPin(LED2_GPIO_PORT, LED2_PIN);
}
/**
* @brief This Function handle Slave events to perform a transmission process
* @note This function is composed in one step :
* -1- Prepare acknowledge for Slave address reception.
* @param None
* @retval None
*/
void Handle_I2C_Slave(void)
{
/* (1) Prepare acknowledge for Slave address reception **********************/
LL_I2C_AcknowledgeNextData(I2C1, LL_I2C_ACK);
}
/**
* @brief This Function handle Master events to perform a reception process
* @note This function is composed in different steps :
* -1- Prepare acknowledge for Master data reception.
* -2- Initiate a Start condition to the Slave device.
* @param None
* @retval None
*/
void Handle_I2C_Master(void)
{
/* (1) Prepare acknowledge for Master data reception ************************/
LL_I2C_AcknowledgeNextData(I2C2, LL_I2C_ACK);
/* (2) Initiate a Start condition to the Slave device ***********************/
/* Master Generate Start condition */
LL_I2C_GenerateStartCondition(I2C2);
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
/******************************************************************************/
/* IRQ HANDLER TREATMENT Functions */
/******************************************************************************/
/**
* @brief Function to manage User push-button
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
/* Update User push-button variable : to be checked in waiting loop in main program */
ubButtonPress = 1;
}
/**
* @brief Function called from I2C IRQ Handler when TXE flag is set
* Function is in charge of transmit a byte on I2C lines.
* @param None
* @retval None
*/
void Slave_Ready_To_Transmit_Callback(void)
{
/* Update ubNbDataToTransmit variable */
ubNbDataToTransmit--;
if(ubNbDataToTransmit == 0)
{
/* Disable Buffer Interrupts */
LL_I2C_DisableIT_BUF(I2C1);
}
/* Send the Byte requested by the Master */
LL_I2C_TransmitData8(I2C1, SLAVE_BYTE_TO_SEND);
}
/**
* @brief Function called from I2C IRQ Handler when RXNE flag is set
* Function is in charge of reading byte received on I2C lines.
* @param None
* @retval None
*/
void Master_Reception_Callback(void)
{
if(ubNbDataToReceive > 3)
{
/* Read character in Receive Data register.
RXNE flag is cleared by reading data in RXDR register */
aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C2);
/* Update ubNbDataToReceive variable */
ubNbDataToReceive--;
}
else if((ubNbDataToReceive == 2) || (ubNbDataToReceive == 3))
{
/* Disable Buffer Interrupts */
LL_I2C_DisableIT_BUF(I2C2);
}
else if(ubNbDataToReceive == 1)
{
/* Disable Buffer Interrupts */
LL_I2C_DisableIT_BUF(I2C2);
/* Generate Stop condition */
LL_I2C_GenerateStopCondition(I2C2);
/* Read character in Receive Data register.
RXNE flag is cleared by reading data in RXDR register */
aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C2);
/* Update ubNbDataToReceive variable */
ubNbDataToReceive--;
/* Call function Master Complete Callback */
Master_Complete_Callback();
}
}
/**
* @brief Function called from Slave I2C IRQ Handler when STOP condition is detected
* Function is in charge of disabling interrupts.
* @param None
* @retval None
*/
void Slave_Complete_Callback(void)
{
/* (1) Disable I2C1 transfer event/error interrupts:
* - Disable Events Interrupt
* - Disable Error interrupts
*/
LL_I2C_DisableIT_EVT(I2C1);
LL_I2C_DisableIT_ERR(I2C1);
}
/**
* @brief Function called from I2C IRQ Handler when STOP flag is set
* Function is in charge of checking data received,
* LED2 is On if data are correct.
* @param None
* @retval None
*/
void Master_Complete_Callback(void)
{
if(ubNbDataToReceive == 3)
{
/* Prepare the generation of a Non ACKnowledge condition after next received bytes */
LL_I2C_AcknowledgeNextData(I2C2, LL_I2C_NACK);
/* Read character in Receive Data register.
RXNE flag is cleared by reading data in RXDR register */
aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C2);
ubNbDataToReceive--;
/* Disable Buffer Interrupts */
LL_I2C_DisableIT_BUF(I2C2);
}
else if(ubNbDataToReceive == 2)
{
/* Generate Stop condition */
LL_I2C_GenerateStopCondition(I2C2);
/* Read character from Receive Data register.
RXNE flag is cleared by reading data in RXDR register */
aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C2);
ubNbDataToReceive--;
/* Read character from shift register.
RXNE flag is cleared by reading data in RXDR register */
aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C2);
ubNbDataToReceive--;
}
else
{
if(ubNbDataToReceive > 0)
{
/* Read character from shift register.
RXNE flag is cleared by reading data in RXDR register */
aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C2);
/* Update ubNbDataToReceive variable */
ubNbDataToReceive--;
}
}
if(ubNbDataToReceive == 0)
{
/* (1) Disable I2C2 transfer event/error interrupts:
* - Disable Events Interrupt
* - Disable Error interrupts
*/
LL_I2C_DisableIT_EVT(I2C2);
LL_I2C_DisableIT_ERR(I2C2);
/* Read Received character.
RXNE flag is cleared by reading of RXDR register */
if(aReceiveBuffer[ubReceiveIndex-1] == SLAVE_BYTE_TO_SEND)
{
/* Turn LED2 On:
* - Expected byte has been received
* - Master Rx sequence completed successfully
*/
LED_On();
}
else
{
/* Call Error function */
Error_Callback();
}
}
}
/**
* @brief Function called in case of error detected in I2C IT Handler
* @param None
* @retval None
*/
void Error_Callback(void)
{
/* Disable I2C1_EV_IRQn and I2C2_EV_IRQn */
NVIC_DisableIRQ(I2C1_EV_IRQn);
NVIC_DisableIRQ(I2C2_EV_IRQn);
/* Disable I2C1_ER_IRQn and I2C2_ER_IRQn */
NVIC_DisableIRQ(I2C1_ER_IRQn);
NVIC_DisableIRQ(I2C2_ER_IRQn);
/* Unexpected event : Set LED2 to Blinking mode to indicate error occurs */
LED_Blinking(LED_BLINK_ERROR);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/