mirror of
https://github.com/STMicroelectronics/STM32CubeF0.git
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345 lines
11 KiB
C
345 lines
11 KiB
C
/**
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******************************************************************************
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* @file I2C/I2C_TwoBoards_ComPolling/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use STM32F0xx I2C HAL API to transmit
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* and receive a data buffer with a communication process based on
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* Polling 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) 2016 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 STM32F0xx_HAL_Examples
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* @{
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*/
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/** @addtogroup I2C_TwoBoards_ComPolling
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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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 0x30F
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/* I2C TIMING Register define when I2C clock source is SYSCLK */
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/* I2C TIMING is calculated in case of the I2C Clock source is the SYSCLK = 48 MHz */
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/* This example use TIMING to 0x00A51314 to reach 1 MHz speed (Rise time = 100 ns, Fall time = 100 ns) */
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#define I2C_TIMING 0x00A51314
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* I2C handler declaration */
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I2C_HandleTypeDef I2cHandle;
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/* Buffer used for transmission */
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uint8_t aTxBuffer[] = " ****I2C_TwoBoards communication based on Polling**** ****I2C_TwoBoards communication based on Polling**** ****I2C_TwoBoards communication based on Polling**** ";
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/* Buffer used for reception */
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uint8_t aRxBuffer[RXBUFFERSIZE];
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/* Private function prototypes -----------------------------------------------*/
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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 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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/* STM32F0xx HAL library initialization:
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- Configure the Flash prefetch
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- Systick timer is configured by default as source of time base, but user
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can eventually implement his proper time base source (a general purpose
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timer for example or other time source), keeping in mind that Time base
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duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
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handled in milliseconds basis.
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- Low Level Initialization
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*/
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HAL_Init();
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/* Configure the system clock to 48 MHz */
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SystemClock_Config();
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/* Configure LED2 */
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BSP_LED_Init(LED2);
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/*##-1- Configure the I2C peripheral ######################################*/
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I2cHandle.Instance = I2Cx;
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I2cHandle.Init.Timing = I2C_TIMING;
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I2cHandle.Init.OwnAddress1 = I2C_ADDRESS;
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I2cHandle.Init.AddressingMode = I2C_ADDRESSINGMODE_10BIT;
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I2cHandle.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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I2cHandle.Init.OwnAddress2 = 0xFF;
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I2cHandle.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
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I2cHandle.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
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if(HAL_I2C_Init(&I2cHandle) != 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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/* Enable the Analog I2C Filter */
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HAL_I2CEx_ConfigAnalogFilter(&I2cHandle,I2C_ANALOGFILTER_ENABLE);
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#ifdef MASTER_BOARD
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/* Configure User push-button */
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BSP_PB_Init(BUTTON_USER,BUTTON_MODE_GPIO);
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/* Wait for User push-button press before starting the Communication */
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while (BSP_PB_GetState(BUTTON_USER) != GPIO_PIN_RESET)
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{
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}
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/* Delay to avoid that possible signal rebound is taken as button release */
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HAL_Delay(50);
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/* Wait for User push-button release before starting the Communication */
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while (BSP_PB_GetState(BUTTON_USER) != GPIO_PIN_SET)
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{
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}
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/* The board sends the message and expects to receive it back */
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/*##-2- Start the transmission process #####################################*/
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/* While the I2C in reception process, user can transmit data through
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"aTxBuffer" buffer */
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/* Timeout is set to 10S */
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while(HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE, 10000)!= HAL_OK)
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{
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/* Error_Handler() function is called when Timeout error occurs.
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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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if (HAL_I2C_GetError(&I2cHandle) != HAL_I2C_ERROR_AF)
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{
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Error_Handler();
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}
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}
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/* Turn LED2 on: Transfer in Transmission process is correct */
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BSP_LED_On(LED2);
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/* Wait for User push-button press before starting the Communication */
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while (BSP_PB_GetState(BUTTON_USER) != GPIO_PIN_RESET)
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{
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}
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/* Delay to avoid that possible signal rebound is taken as button release */
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HAL_Delay(50);
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/* Wait for User push-button release before starting the Communication */
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while (BSP_PB_GetState(BUTTON_USER) != GPIO_PIN_SET)
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{
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}
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/*##-3- Put I2C peripheral in reception process ############################*/
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/* Timeout is set to 10S */
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while(HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 10000) != HAL_OK)
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{
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/* Error_Handler() function is called when Timeout error occurs.
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When Acknowledge failure occurs (Slave don't acknowledge it's address)
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Master restarts communication */
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if (HAL_I2C_GetError(&I2cHandle) != HAL_I2C_ERROR_AF)
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{
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Error_Handler();
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}
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}
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/* Turn LED2 off: Transfer in reception process is correct */
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BSP_LED_Off(LED2);
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#else
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/* The board receives the message and sends it back */
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/*##-2- Put I2C peripheral in reception process ############################*/
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/* Timeout is set to 10S */
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if(HAL_I2C_Slave_Receive(&I2cHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 10000) != HAL_OK)
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{
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/* Transfer error in reception process */
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Error_Handler();
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}
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/* Turn LED2 on: Transfer in reception process is correct */
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BSP_LED_On(LED2);
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/*##-3- Start the transmission process #####################################*/
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/* While the I2C in reception process, user can transmit data through
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"aTxBuffer" buffer */
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/* Timeout is set to 10S */
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if(HAL_I2C_Slave_Transmit(&I2cHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE, 10000)!= HAL_OK)
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{
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/* Transfer error in transmission process */
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Error_Handler();
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}
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/* Turn LED2 off: Transfer in transmission process is correct */
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BSP_LED_Off(LED2);
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#endif /* MASTER_BOARD */
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/*##-4- Compare the sent and received buffers ##############################*/
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if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE))
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{
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/* Processing Error */
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Error_Handler();
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}
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/* Infinite loop */
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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) = 48000000
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* HCLK(Hz) = 48000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 1
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* HSI Frequency(Hz) = 8000000
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* PREDIV = 2
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* PLLMUL = 12
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* Flash Latency(WS) = 1
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* @param None
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* @retval None
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*/
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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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/* No HSE Oscillator on Nucleo, Activate PLL with HSI as source */
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RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_NONE;
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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.PREDIV = RCC_PREDIV_DIV2;
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RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
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if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 clocks dividers */
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RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
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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_DIV1;
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if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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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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*/
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if (HAL_I2C_GetError(I2cHandle) != HAL_I2C_ERROR_AF)
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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 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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/* Error if LED2 is slowly blinking (1 sec. period) */
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while(1)
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{
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BSP_LED_Toggle(LED2);
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HAL_Delay(1000);
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}
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}
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/**
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* @brief Compares two buffers.
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* @param pBuffer1, pBuffer2: buffers to be compared.
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* @param BufferLength: buffer's length
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* @retval 0 : pBuffer1 identical to pBuffer2
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* >0 : pBuffer1 differs from pBuffer2
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*/
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static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
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{
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while (BufferLength--)
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{
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if ((*pBuffer1) != *pBuffer2)
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{
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return BufferLength;
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}
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pBuffer1++;
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pBuffer2++;
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}
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return 0;
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t* file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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