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546 lines
19 KiB
C
546 lines
19 KiB
C
/**
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******************************************************************************
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* @file I2C/I2C_TwoBoards_AdvComIT/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use STM32F4xx I2C HAL API to transmit
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* and receive data buffer with a communication process based on
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* IT transfer.
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* The communication is done using 2 Boards.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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/** @addtogroup STM32F4xx_HAL_Examples
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* @{
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*/
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/** @addtogroup I2C_TwoBoards_AdvComIT
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Uncomment this line to use the board as master, if not it is used as slave */
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#define MASTER_BOARD
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#define I2C_ADDRESS 0x3E /* Real 7 bits slave address value in Datasheet is: b0011111
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mean in uint8_t equivalent at 0x1F and this value can be
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seen in the OAR1 register in bits ADD[1:7] */
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#define MASTER_REQ_READ 0x12
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#define MASTER_REQ_WRITE 0x34
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/* Private variables ---------------------------------------------------------*/
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/* I2C handler declaration */
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I2C_HandleTypeDef I2CxHandle;
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/* Buffer used for transmission */
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uint8_t aTxBuffer[] = " ****I2C_TwoBoards advanced communication based on IT**** ****I2C_TwoBoards advanced communication based on IT**** ****I2C_TwoBoards advanced communication based on IT**** ";
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/* Buffer used for reception */
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uint8_t aRxBuffer[RXBUFFERSIZE];
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uint16_t hTxNumData = 0, hRxNumData = 0;
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uint8_t bTransferRequest = 0;
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/* Private function prototypes -----------------------------------------------*/
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static void SystemClock_Config(void);
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static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);
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static void Flush_Buffer(uint8_t* pBuffer, uint16_t BufferLength);
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static void Error_Handler(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program
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* @param None
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* @retval None
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*/
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int main(void)
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{
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/* STM32F4xx HAL library initialization:
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- Configure the Flash prefetch, instruction and Data caches
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- Configure the Systick to generate an interrupt each 1 msec
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- Set NVIC Group Priority to 4
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- Global MSP (MCU Support Package) initialization
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*/
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HAL_Init();
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/* Configure LED4 and LED5 */
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BSP_LED_Init(LED4);
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BSP_LED_Init(LED5);
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/* Configure the system clock to 100 MHz */
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SystemClock_Config();
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/*##-1- Configure the I2C peripheral #######################################*/
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I2CxHandle.Instance = I2Cx;
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I2CxHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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I2CxHandle.Init.ClockSpeed = 400000;
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I2CxHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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I2CxHandle.Init.DutyCycle = I2C_DUTYCYCLE_16_9;
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I2CxHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
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I2CxHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
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I2CxHandle.Init.OwnAddress1 = I2C_ADDRESS;
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I2CxHandle.Init.OwnAddress2 = 0;
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if(HAL_I2C_Init(&I2CxHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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#ifdef MASTER_BOARD
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/* Configure User Button */
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BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO);
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/* Wait for User Button press before starting the Communication */
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while (BSP_PB_GetState(BUTTON_KEY) != 1)
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{
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}
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/* Wait for User Button release before starting the Communication */
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while (BSP_PB_GetState(BUTTON_KEY) != 0)
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{
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}
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while(1)
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{
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/* Initialize number of data variables */
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hTxNumData = TXBUFFERSIZE;
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hRxNumData = RXBUFFERSIZE;
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/* Update bTransferRequest to send buffer write request for Slave */
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bTransferRequest = MASTER_REQ_WRITE;
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/*##-2- Master sends write request for slave #############################*/
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do
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{
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if(HAL_I2C_Master_Transmit_IT(&I2CxHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&bTransferRequest, 1)!= HAL_OK)
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{
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/* Error_Handler() function is called in case of error. */
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Error_Handler();
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}
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* When Acknowledge failure occurs (Slave don't acknowledge its address)
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Master restarts communication */
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}
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while(HAL_I2C_GetError(&I2CxHandle) == HAL_I2C_ERROR_AF);
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/*##-3- Master sends number of data to be written ########################*/
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do
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{
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if(HAL_I2C_Master_Transmit_IT(&I2CxHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&hTxNumData, 2)!= HAL_OK)
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{
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/* Error_Handler() function is called in case of error. */
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Error_Handler();
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}
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* When Acknowledge failure occurs (Slave don't acknowledge its address)
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Master restarts communication */
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}
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while(HAL_I2C_GetError(&I2CxHandle) == HAL_I2C_ERROR_AF);
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/*##-4- Master sends aTxBuffer to slave ##################################*/
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do
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{
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if(HAL_I2C_Master_Transmit_IT(&I2CxHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK)
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{
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/* Error_Handler() function is called in case of error. */
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Error_Handler();
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}
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* When Acknowledge failure occurs (Slave don't acknowledge its address)
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Master restarts communication */
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}
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while(HAL_I2C_GetError(&I2CxHandle) == HAL_I2C_ERROR_AF);
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/* Update bTransferRequest to send buffer read request for Slave */
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bTransferRequest = MASTER_REQ_READ;
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/*##-5- Master sends read request for slave ##############################*/
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do
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{
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if(HAL_I2C_Master_Transmit_IT(&I2CxHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&bTransferRequest, 1)!= HAL_OK)
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{
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/* Error_Handler() function is called in case of error. */
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Error_Handler();
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}
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* When Acknowledge failure occurs (Slave don't acknowledge its address)
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Master restarts communication */
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}
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while(HAL_I2C_GetError(&I2CxHandle) == HAL_I2C_ERROR_AF);
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/*##-6- Master sends number of data to be read ###########################*/
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do
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{
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if(HAL_I2C_Master_Transmit_IT(&I2CxHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)&hRxNumData, 2)!= HAL_OK)
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{
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/* Error_Handler() function is called in case of error. */
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Error_Handler();
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}
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* When Acknowledge failure occurs (Slave don't acknowledge its address)
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Master restarts communication */
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}
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while(HAL_I2C_GetError(&I2CxHandle) == HAL_I2C_ERROR_AF);
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/*##-7- Master receives aRxBuffer from slave #############################*/
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do
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{
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if(HAL_I2C_Master_Receive_IT(&I2CxHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aRxBuffer, RXBUFFERSIZE)!= HAL_OK)
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{
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/* Error_Handler() function is called in case of error. */
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Error_Handler();
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}
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* When Acknowledge failure occurs (Slave don't acknowledge its address)
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Master restarts communication */
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}
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while(HAL_I2C_GetError(&I2CxHandle) == HAL_I2C_ERROR_AF);
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/* Check correctness of received buffer ##################################*/
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if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,hRxNumData))
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{
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/* Processing Error */
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Error_Handler();
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}
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/* Flush Rx buffers */
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Flush_Buffer((uint8_t*)aRxBuffer,RXBUFFERSIZE);
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/* Toggle LED4 */
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BSP_LED_Toggle(LED4);
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/* This delay permit the user to see LED4 toggling */
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HAL_Delay(25);
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}
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#else
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while(1)
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{
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/* Initialize number of data variables */
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hTxNumData = 0;
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hRxNumData = 0;
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/*##-2- Slave receive request from master ################################*/
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while(HAL_I2C_Slave_Receive_IT(&I2CxHandle, (uint8_t*)&bTransferRequest, 1)!= HAL_OK)
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{
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}
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* If master request write operation #####################################*/
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if (bTransferRequest == MASTER_REQ_WRITE)
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{
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/*##-3- Slave receive number of data to be read ########################*/
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while(HAL_I2C_Slave_Receive_IT(&I2CxHandle, (uint8_t*)&hRxNumData, 2)!= HAL_OK);
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/*##-4- Slave receives aRxBuffer from master ###########################*/
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while(HAL_I2C_Slave_Receive_IT(&I2CxHandle, (uint8_t*)aRxBuffer, hRxNumData)!= HAL_OK);
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/* Check correctness of received buffer ################################*/
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if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,hRxNumData))
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{
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/* Processing Error */
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Error_Handler();
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}
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/* Flush Rx buffers */
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Flush_Buffer((uint8_t*)aRxBuffer,RXBUFFERSIZE);
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/* Toggle LED4 */
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BSP_LED_Toggle(LED4);
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}
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/* If master request write operation #####################################*/
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else
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{
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/*##-3- Slave receive number of data to be written #####################*/
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while(HAL_I2C_Slave_Receive_IT(&I2CxHandle, (uint8_t*)&hTxNumData, 2)!= HAL_OK);
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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/*##-4- Slave transmit aTxBuffer to master #############################*/
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while(HAL_I2C_Slave_Transmit_IT(&I2CxHandle, (uint8_t*)aTxBuffer, RXBUFFERSIZE)!= HAL_OK);
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/* Before starting a new communication transfer, you need to check the current
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state of the peripheral; if it<69>s busy you need to wait for the end of current
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transfer before starting a new one.
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For simplicity reasons, this example is just waiting till the end of the
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transfer, but application may perform other tasks while transfer operation
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is ongoing. */
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while (HAL_I2C_GetState(&I2CxHandle) != HAL_I2C_STATE_READY)
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{
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}
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}
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}
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#endif /* MASTER_BOARD */
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}
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/**
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* @brief This function is executed in case of error occurrence.
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* @param None
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* @retval None
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*/
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static void Error_Handler(void)
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{
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/* Turn LED4 off */
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BSP_LED_Off(LED4);
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/* Turn LED5 on */
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BSP_LED_On(LED5);
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while(1)
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{
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}
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSI)
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* SYSCLK(Hz) = 100000000
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* HCLK(Hz) = 100000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* HSI Frequency(Hz) = 16000000
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* PLL_M = 16
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* PLL_N = 400
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* PLL_P = 4
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* PLL_Q = 7
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* VDD(V) = 3.3
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* Main regulator output voltage = Scale1 mode
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* Flash Latency(WS) = 3
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* @param None
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* @retval None
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*/
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static void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef RCC_ClkInitStruct;
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RCC_OscInitTypeDef RCC_OscInitStruct;
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/* Enable Power Control clock */
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__HAL_RCC_PWR_CLK_ENABLE();
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/* The voltage scaling allows optimizing the power consumption when the device is
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clocked below the maximum system frequency, to update the voltage scaling value
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regarding system frequency refer to product datasheet. */
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__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
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/* Enable HSI Oscillator and activate PLL with HSI as source */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
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RCC_OscInitStruct.HSIState = RCC_HSI_ON;
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RCC_OscInitStruct.HSICalibrationValue = 0x10;
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RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
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RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
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RCC_OscInitStruct.PLL.PLLM = 16;
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RCC_OscInitStruct.PLL.PLLN = 400;
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RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
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RCC_OscInitStruct.PLL.PLLQ = 7;
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if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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{
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Error_Handler();
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
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clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
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RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
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if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
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{
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Error_Handler();
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}
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}
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/**
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* @brief I2C error callbacks
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* @param I2cHandle: I2C handle
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* @note This example shows a simple way to report transfer error, and you can
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* add your own implementation.
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* @retval None
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*/
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void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *I2cHandle)
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{
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/** Error_Handler() function is called when error occurs.
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* 1- When Slave don't acknowledge it's address, Master restarts communication.
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* 2- When Master don't acknowledge the last data transferred, Slave don't care in this example.
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*/
|
||
if (HAL_I2C_GetError(I2cHandle) != HAL_I2C_ERROR_AF)
|
||
{
|
||
Error_Handler();
|
||
}
|
||
}
|
||
|
||
/**
|
||
* @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
|
||
|
||
/**
|
||
* @}
|
||
*/
|
||
|
||
/**
|
||
* @}
|
||
*/
|