315 lines
9.6 KiB
C
315 lines
9.6 KiB
C
/**
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******************************************************************************
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* @file SPI/SPI_FullDuplex_ComDMA/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use STM32F1xx SPI HAL API to transmit
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* and receive a data buffer with a communication process based on
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* DMA 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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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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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 STM32F1xx_HAL_Examples
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* @{
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*/
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/** @addtogroup SPI_FullDuplex_ComDMA
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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enum {
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TRANSFER_WAIT,
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TRANSFER_COMPLETE,
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TRANSFER_ERROR
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};
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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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/* Private variables ---------------------------------------------------------*/
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/* SPI handler declaration */
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SPI_HandleTypeDef SpiHandle;
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/* Buffer used for transmission */
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uint8_t aTxBuffer[] = "****SPI - Two Boards communication based on DMA **** SPI Message ******** SPI Message ******** SPI Message ****";
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/* Buffer used for reception */
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uint8_t aRxBuffer[BUFFERSIZE];
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/* transfer state */
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__IO uint32_t wTransferState = TRANSFER_WAIT;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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static void Error_Handler(void);
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static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);
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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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/* STM32F1xx 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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- Set NVIC Group Priority to 4
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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 24 MHz */
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SystemClock_Config();
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/* Configure LED3 and LED4 */
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BSP_LED_Init(LED3);
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BSP_LED_Init(LED4);
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/*##-1- Configure the SPI peripheral #######################################*/
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/* Set the SPI parameters */
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SpiHandle.Instance = SPIx;
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SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
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SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
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SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;
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SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
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SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
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SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
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SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
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SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
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SpiHandle.Init.CRCPolynomial = 7;
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SpiHandle.Init.NSS = SPI_NSS_SOFT;
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#ifdef MASTER_BOARD
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SpiHandle.Init.Mode = SPI_MODE_MASTER;
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#else
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SpiHandle.Init.Mode = SPI_MODE_SLAVE;
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#endif /* MASTER_BOARD */
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if(HAL_SPI_Init(&SpiHandle) != 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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/* SPI block is enabled prior calling SPI transmit/receive functions, in order to get CLK signal properly pulled down.
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Otherwise, SPI CLK signal is not clean on this board and leads to errors during transfer */
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__HAL_SPI_ENABLE(&SpiHandle);
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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_SET)
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{
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BSP_LED_Toggle(LED3);
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HAL_Delay(100);
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}
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BSP_LED_Off(LED3);
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#endif /* MASTER_BOARD */
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/*##-2- Start the Full Duplex Communication process ########################*/
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/* While the SPI in TransmitReceive process, user can transmit data through
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"aTxBuffer" buffer & receive data through "aRxBuffer" */
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if(HAL_SPI_TransmitReceive_DMA(&SpiHandle, (uint8_t*)aTxBuffer, (uint8_t *)aRxBuffer, BUFFERSIZE) != 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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/*##-3- Wait for the end of the transfer ###################################*/
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/* Before starting a new communication transfer, you must wait the callback call
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to get the transfer complete confirmation or an error detection.
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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 (wTransferState == TRANSFER_WAIT)
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{
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}
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switch(wTransferState)
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{
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case TRANSFER_COMPLETE :
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/*##-4- Compare the sent and received buffers ##############################*/
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if(Buffercmp((uint8_t*)aTxBuffer, (uint8_t*)aRxBuffer, BUFFERSIZE))
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{
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/* Processing Error */
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Error_Handler();
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}
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break;
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default :
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Error_Handler();
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break;
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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 (HSE)
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* SYSCLK(Hz) = 24000000
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* HCLK(Hz) = 24000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 1
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* APB2 Prescaler = 1
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* HSE Frequency(Hz) = 8000000
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* HSE PREDIV1 = 2
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* PLLMUL = 6
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* Flash Latency(WS) = 0
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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 clkinitstruct = {0};
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RCC_OscInitTypeDef oscinitstruct = {0};
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/* Enable HSE Oscillator and activate PLL with HSE as source */
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oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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oscinitstruct.HSEState = RCC_HSE_ON;
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oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV2;
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oscinitstruct.PLL.PLLState = RCC_PLL_ON;
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oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL6;
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if (HAL_RCC_OscConfig(&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 and PCLK2
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clocks dividers */
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clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
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clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV1;
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if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_0)!= 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 TxRx Transfer completed callback.
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* @param hspi: SPI handle
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* @note This example shows a simple way to report end of DMA TxRx transfer, and
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* you can add your own implementation.
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* @retval None
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*/
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void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef *hspi)
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{
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/* Turn LED3 on: Transfer in transmission/reception process is complete */
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BSP_LED_On(LED3);
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wTransferState = TRANSFER_COMPLETE;
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}
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/**
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* @brief SPI error callbacks.
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* @param hspi: SPI 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_SPI_ErrorCallback(SPI_HandleTypeDef *hspi)
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{
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wTransferState = TRANSFER_ERROR;
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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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BSP_LED_Off(LED3);
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/* Turn LED4 on */
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BSP_LED_On(LED4);
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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 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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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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