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/**
******************************************************************************
* @file I2C/I2C_TwoBoards_AdvComIT/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use STM32F4xx I2C HAL API to transmit
* and receive a data buffer with a communication process based on
* IT transfer.
* The communication is done using 2 Boards.
******************************************************************************
* @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_HAL_Examples
* @{
*/
/** @addtogroup I2C_TwoBoards_AdvComIT
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Uncomment this line to use the board as master, if not it is used as slave */
//#define MASTER_BOARD
#define I2C_ADDRESS 0x3E
#define MASTER_REQ_READ 0x12
#define MASTER_REQ_WRITE 0x34
/* I2C SPEEDCLOCK define to max value: 400 KHz on STM32F4xx*/
#define I2C_SPEEDCLOCK 400000
#define I2C_DUTYCYCLE I2C_DUTYCYCLE_2
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* I2C handler declaration */
I2C_HandleTypeDef I2cHandle;
/* Buffer used for transmission */
uint8_t aTxBuffer[] = " ****I2C_TwoBoards communication based on IT**** ****I2C_TwoBoards communication based on IT**** ****I2C_TwoBoards communication based on IT**** ";
/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];
__IO uint16_t hTxNumData = 0;
__IO uint16_t hRxNumData = 0;
uint8_t bTransferRequest = 0;
/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);
static void Flush_Buffer(uint8_t* pBuffer, uint16_t BufferLength);
static void Error_Handler(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Configure LED1 and LED3 */
BSP_LED_Init(LED1);
BSP_LED_Init(LED3);
/*##-1- Configure the I2C peripheral ######################################*/
I2cHandle.Instance = I2Cx;
I2cHandle.Init.ClockSpeed = I2C_SPEEDCLOCK;
I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE;
I2cHandle.Init.OwnAddress1 = I2C_ADDRESS;
I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
I2cHandle.Init.OwnAddress2 = 0xFF;
I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
if(HAL_I2C_Init(&I2cHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
#ifdef MASTER_BOARD
/* Configure User push-button */
BSP_PB_Init(BUTTON_USER,BUTTON_MODE_GPIO);
/* Wait for User push-button press before starting the Communication */
while (BSP_PB_GetState(BUTTON_USER) != GPIO_PIN_SET)
{
}
/* Wait for User push-button release before starting the Communication */
while (BSP_PB_GetState(BUTTON_USER) != GPIO_PIN_RESET)
{
}
while(1)
{
/* Initialize number of data variables */
hTxNumData = TXBUFFERSIZE;
hRxNumData = RXBUFFERSIZE;
/* Update bTransferRequest to send buffer write request for Slave */
bTransferRequest = MASTER_REQ_WRITE;
/*##-2- Master sends write request for slave #############################*/
do
{
if(HAL_I2C_Master_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&bTransferRequest, 1)!= HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
}
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
/*##-3- Master sends number of data to be written ########################*/
do
{
if(HAL_I2C_Master_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&hTxNumData, 2)!= HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
}
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
/*##-4- Master sends aTxBuffer to slave ##################################*/
do
{
if(HAL_I2C_Master_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
}
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
/* Update bTransferRequest to send buffer read request for Slave */
bTransferRequest = MASTER_REQ_READ;
/*##-5- Master sends read request for slave ##############################*/
do
{
if(HAL_I2C_Master_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&bTransferRequest, 1)!= HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
}
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
/*##-6- Master sends number of data to be read ###########################*/
do
{
if(HAL_I2C_Master_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&hRxNumData, 2)!= HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
}
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
/*##-7- Master receives aRxBuffer from slave #############################*/
do
{
if(HAL_I2C_Master_Receive_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aRxBuffer, RXBUFFERSIZE)!= HAL_OK)
{
/* Error_Handler() function is called when error occurs. */
Error_Handler();
}
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
}
while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF);
/* Check correctness of received buffer ##################################*/
if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,hRxNumData))
{
/* Processing Error */
Error_Handler();
}
/* Flush Rx buffers */
Flush_Buffer((uint8_t*)aRxBuffer,RXBUFFERSIZE);
/* Toggle LED1 */
BSP_LED_Toggle(LED1);
/* This delay permits to see LED1 toggling */
HAL_Delay(25);
}
#else
while(1)
{
/* Initialize number of data variables */
hTxNumData = 0;
hRxNumData = 0;
/*##-2- Slave receive request from master ################################*/
while(HAL_I2C_Slave_Receive_IT(&I2cHandle, (uint8_t*)&bTransferRequest, 1)!= HAL_OK)
{
}
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* If master request write operation #####################################*/
if (bTransferRequest == MASTER_REQ_WRITE)
{
/*##-3- Slave receive number of data to be read ########################*/
while(HAL_I2C_Slave_Receive_IT(&I2cHandle, (uint8_t*)&hRxNumData, 2)!= HAL_OK);
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/*##-4- Slave receives aRxBuffer from master ###########################*/
while(HAL_I2C_Slave_Receive_IT(&I2cHandle, (uint8_t*)aRxBuffer, hRxNumData)!= HAL_OK);
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/* Check correctness of received buffer ################################*/
if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,hRxNumData))
{
/* Processing Error */
Error_Handler();
}
/* Flush Rx buffers */
Flush_Buffer((uint8_t*)aRxBuffer,RXBUFFERSIZE);
/* Toggle LED1 */
BSP_LED_Toggle(LED1);
}
/* If master request write operation #####################################*/
else
{
/*##-3- Slave receive number of data to be written #####################*/
while(HAL_I2C_Slave_Receive_IT(&I2cHandle, (uint8_t*)&hTxNumData, 2)!= HAL_OK);
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
/*##-4- Slave transmit aTxBuffer to master #############################*/
while(HAL_I2C_Slave_Transmit_IT(&I2cHandle, (uint8_t*)aTxBuffer, RXBUFFERSIZE)!= HAL_OK);
/* Before starting a new communication transfer, you need to check the current
state of the peripheral; if it�s busy you need to wait for the end of current
transfer before starting a new one.
For simplicity reasons, this example is just waiting till the end of the
transfer, but application may perform other tasks while transfer operation
is ongoing. */
while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY)
{
}
}
}
#endif /* MASTER_BOARD */
}
/**
* @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 = 200
* PLL_P = 2
* PLL_Q = 7
* PLL_R = 2
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
HAL_StatusTypeDef ret = HAL_OK;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/* Enable HSE Oscillator and activate PLL with HSE as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 200;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 7;
RCC_OscInitStruct.PLL.PLLR = 2;
ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
if(ret != HAL_OK)
{
while(1) { ; }
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3);
if(ret != HAL_OK)
{
while(1) { ; }
}
}
/**
* @brief I2C error callbacks.
* @param I2cHandle: I2C handle
* @note This example shows a simple way to report transfer error, and you can
* add your own implementation.
* @retval None
*/
void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *I2cHandle)
{
/** Error_Handler() function is called when error occurs.
* 1- When Slave don't acknowledge it's address, Master restarts communication.
* 2- When Master don't acknowledge the last data transferred, Slave don't care in this example.
*/
if (HAL_I2C_GetError(I2cHandle) != HAL_I2C_ERROR_AF)
{
/* Turn Off LED1 */
BSP_LED_Off(LED1);
/* Turn On LED3 */
BSP_LED_On(LED3);
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Turn LED1 off */
BSP_LED_Off(LED1);
/* Turn LED3 on */
BSP_LED_On(LED3);
while(1)
{
}
}
/**
* @brief Compares two buffers.
* @param pBuffer1, pBuffer2: buffers to be compared.
* @param BufferLength: buffer's length
* @retval 0 : pBuffer1 identical to pBuffer2
* >0 : pBuffer1 differs from pBuffer2
*/
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
while (BufferLength--)
{
if ((*pBuffer1) != *pBuffer2)
{
return BufferLength;
}
pBuffer1++;
pBuffer2++;
}
return 0;
}
/**
* @brief Flushes the buffer
* @param pBuffer: buffers to be flushed.
* @param BufferLength: buffer's length
* @retval None
*/
static void Flush_Buffer(uint8_t* pBuffer, uint16_t BufferLength)
{
while (BufferLength--)
{
*pBuffer = 0;
pBuffer++;
}
}
#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\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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