I2C_TwoBoards_ComIT
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Outline
Includes
#include "main.h"
Private macro
#define MASTER_BOARD
#define I2C_ADDRESS
Private variables
aTxBuffer
aRxBuffer
Private function prototypes
main()
Error_Handler()
SystemClock_Config()
HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *)
HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *)
HAL_I2C_ErrorCallback(I2C_HandleTypeDef *)
Buffercmp(uint8_t *, uint8_t *, uint16_t)
Files
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SourceVuSTM32 Libraries and SamplesI2C_TwoBoards_ComITSrc/main.c
 
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/** ****************************************************************************** * @file I2C/I2C_TwoBoards_ComIT/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_ComIT * @{ *//* ... */ Includes /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Uncomment this line to use the board as master, if not it is used as slave */ #define MASTER_BOARD #define I2C_ADDRESS 0x30F Private macro /* Private variables ---------------------------------------------------------*/ /* I2C handler declaration */ extern 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]; Private variables /* Private function prototypes -----------------------------------------------*/ static void SystemClock_Config(void); static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength); static void Error_Handler(void); Private function prototypes /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None *//* ... */ int main(void) { /* STM32F4xx HAL library initialization: - Configure the Flash prefetch, instruction and Data caches - Configure the Systick to generate an interrupt each 1 msec - Set NVIC Group Priority to 4 - Global MSP (MCU Support Package) initialization *//* ... */ HAL_Init(); /* Configure LED3 and LED4 */ BSP_LED_Init(LED3); BSP_LED_Init(LED4); /* Configure the system clock to 180 MHz */ SystemClock_Config(); /*##-1- Configure the I2C peripheral #######################################*/ I2cHandle.Instance = I2Cx; I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_10BIT; I2cHandle.Init.ClockSpeed = 400000; I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE; I2cHandle.Init.DutyCycle = I2C_DUTYCYCLE_16_9; I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE; I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE; I2cHandle.Init.OwnAddress1 = I2C_ADDRESS; I2cHandle.Init.OwnAddress2 = 0xFE; if(HAL_I2C_Init(&I2cHandle) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_I2C_Init(&I2cHandle) != HAL_OK) { ... } #ifdef MASTER_BOARD /* Configure USER Button */ BSP_PB_Init(BUTTON_KEY, BUTTON_MODE_GPIO); /* Wait for USER Button press before starting the Communication */ while (BSP_PB_GetState(BUTTON_KEY) != 1) { }while (BSP_PB_GetState(BUTTON_KEY) != 1) { ... } /* Wait for USER Button release before starting the Communication */ while (BSP_PB_GetState(BUTTON_KEY) != 0) { }while (BSP_PB_GetState(BUTTON_KEY) != 0) { ... } /* The board sends the message and expects to receive it back */ do { /*##-2- Start the transmission process #####################################*/ /* While the I2C in reception process, user can transmit data through "aTxBuffer" buffer *//* ... */ if(HAL_I2C_Master_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK) { /* Error_Handler() function is called in case of error. */ Error_Handler(); }if (HAL_I2C_Master_Transmit_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK) { ... } /*##-3- Wait for the end of the transfer ###################################*/ /* 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) { }while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY) { ... } /* When Acknowledge failure occurs (Slave don't acknowledge its address) Master restarts communication *//* ... */ ...} while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF); /* Wait for User Button press before starting the Communication */ while (BSP_PB_GetState(BUTTON_KEY) != 1) { }while (BSP_PB_GetState(BUTTON_KEY) != 1) { ... } /* Wait for User Button release before starting the Communication */ while (BSP_PB_GetState(BUTTON_KEY) != 0) { }while (BSP_PB_GetState(BUTTON_KEY) != 0) { ... } /*##-4- Put I2C peripheral in reception process ############################*/ do { if(HAL_I2C_Master_Receive_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK) { /* Error_Handler() function is called in case of error. */ Error_Handler(); }if (HAL_I2C_Master_Receive_IT(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK) { ... } /* When Acknowledge failure occurs (Slave don't acknowledge its address) Master restarts communication *//* ... */ ...} while(HAL_I2C_GetError(&I2cHandle) == HAL_I2C_ERROR_AF); /* ... */ #else /* The board receives the message and sends it back */ /*##-2- Put I2C peripheral in reception process ############################*/ if(HAL_I2C_Slave_Receive_IT(&I2cHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK) { /* Transfer error in reception process */ Error_Handler(); }if (HAL_I2C_Slave_Receive_IT(&I2cHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK) { ... } /*##-3- Wait for the end of the transfer ###################################*/ /* 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) { }while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY) { ... } /*##-4- Start the transmission process #####################################*/ /* While the I2C in reception process, user can transmit data through "aTxBuffer" buffer *//* ... */ if(HAL_I2C_Slave_Transmit_IT(&I2cHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK) { /* Transfer error in transmission process */ Error_Handler(); }if (HAL_I2C_Slave_Transmit_IT(&I2cHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK) { ... } /* ... */ #endif /* MASTER_BOARD */ /*##-5- Wait for the end of the transfer ###################################*/ /* 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) { }while (HAL_I2C_GetState(&I2cHandle) != HAL_I2C_STATE_READY) { ... } /*##-6- Compare the sent and received buffers ##############################*/ if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE)) { /* Processing Error */ Error_Handler(); }if (Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE)) { ... } /* Infinite loop */ while (1) { }while (1) { ... } }{ ... } /** * @brief This function is executed in case of error occurrence. * @param None * @retval None *//* ... */ static void Error_Handler(void) { /* Turn LED4 on */ BSP_LED_On(LED4); while(1) { }while (1) { ... } }{ ... } /** * @brief System Clock Configuration * The system Clock is configured as follow : * System Clock source = PLL (HSE) * SYSCLK(Hz) = 180000000 * HCLK(Hz) = 180000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSE Frequency(Hz) = 8000000 * PLL_M = 8 * PLL_N = 360 * PLL_P = 2 * PLL_Q = 7 * VDD(V) = 3.3 * Main regulator output voltage = Scale1 mode * Flash Latency(WS) = 5 * @param None * @retval None *//* ... */ static void SystemClock_Config(void) { RCC_ClkInitTypeDef RCC_ClkInitStruct; RCC_OscInitTypeDef RCC_OscInitStruct; /* 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_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 8; RCC_OscInitStruct.PLL.PLLN = 360; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; HAL_RCC_OscConfig(&RCC_OscInitStruct); /* Activate the Over-Drive mode */ HAL_PWREx_EnableOverDrive(); /* 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_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5); }{ ... } /** * @brief Tx Transfer completed callback. * @param I2cHandle: I2C handle * @note This example shows a simple way to report end of IT Tx transfer, and * you can add your own implementation. * @retval None *//* ... */ #ifdef MASTER_BOARD void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *I2cHandle) { /* Toggle LED3: Transfer in transmission process is correct */ BSP_LED_Toggle(LED3); }{ ... } /* ... */#else void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *I2cHandle) { /* Toggle LED3: Transfer in transmission process is correct */ BSP_LED_Toggle(LED3); }HAL_I2C_SlaveTxCpltCallback (I2C_HandleTypeDef *I2cHandle) { ... } /* ... */#endif /* MASTER_BOARD */ /** * @brief Rx Transfer completed callback. * @param I2cHandle: I2C handle * @note This example shows a simple way to report end of IT Rx transfer, and * you can add your own implementation. * @retval None *//* ... */ #ifdef MASTER_BOARD void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *I2cHandle) { /* Toggle LED3: Transfer in reception process is correct */ BSP_LED_Toggle(LED3); }{ ... } /* ... */#else void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *I2cHandle) { /* Toggle LED3: Transfer in reception process is correct */ BSP_LED_Toggle(LED3); }HAL_I2C_SlaveRxCpltCallback (I2C_HandleTypeDef *I2cHandle) { ... } /* ... */#endif /* MASTER_BOARD */ /** * @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) { /* Turn LED4 on: Transfer error in reception/transmission process */ BSP_LED_On(LED4); }{ ... } /** * @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; }if ((*pBuffer1) != *pBuffer2) { ... } pBuffer1++; pBuffer2++; }while (BufferLength--) { ... } return 0; }{ ... } #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) { }while (1) { ... } }assert_failed (uint8_t* file, uint32_t line) { ... } /* ... */#endif /** * @} *//* ... */ /** * @} *//* ... */
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