282 lines
9.1 KiB
C
282 lines
9.1 KiB
C
/**
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******************************************************************************
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* @file UART/UART_HyperTerminal_DMA/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use UART 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 with the Hyperterminal PC application.
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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 STM32F1xx_HAL_Examples
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* @{
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*/
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/** @addtogroup UART_Hyperterminal_DMA
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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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/* Private variables ---------------------------------------------------------*/
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/* UART handler declaration */
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UART_HandleTypeDef UartHandle;
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/* Buffer used for transmission */
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uint8_t aTxBuffer[] = "\n\r ****UART-Hyperterminal communication based on DMA****\n\r Enter 10 characters using keyboard :\n\r";
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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 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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/* 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 UART peripheral ######################################*/
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/* Put the USART peripheral in the Asynchronous mode (UART Mode) */
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/* UART configured as follows:
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- Word Length = 8 Bits
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- Stop Bit = One Stop bit
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- Parity = ODD parity
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- BaudRate = 9600 baud
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- Hardware flow control disabled (RTS and CTS signals) */
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UartHandle.Instance = USARTx;
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UartHandle.Init.BaudRate = 9600;
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UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
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UartHandle.Init.StopBits = UART_STOPBITS_1;
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UartHandle.Init.Parity = UART_PARITY_ODD;
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UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
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UartHandle.Init.Mode = UART_MODE_TX_RX;
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if (HAL_UART_Init(&UartHandle) != 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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/*##-2- Start the transmission process #####################################*/
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/* User start transmission data through "TxBuffer" buffer */
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if (HAL_UART_Transmit_DMA(&UartHandle, (uint8_t *)aTxBuffer, TXBUFFERSIZE) != 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- Put UART peripheral in reception process ###########################*/
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/* Any data received will be stored in "RxBuffer" buffer : the number max of
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data received is 10 */
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if (HAL_UART_Receive_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != 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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/*##-4- Wait for the end of the transfer ###################################*/
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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_UART_GetState(&UartHandle) != HAL_UART_STATE_READY)
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{
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}
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/*##-5- Send the received Buffer ###########################################*/
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if (HAL_UART_Transmit_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != 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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/*##-6- Wait for the end of the transfer ###################################*/
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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_UART_GetState(&UartHandle) != HAL_UART_STATE_READY)
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{
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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 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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/* Toggle LED4 for error */
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while(1)
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{
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BSP_LED_Toggle(LED4);
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HAL_Delay(1000);
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}
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}
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/**
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* @brief Tx Transfer completed callback
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* @param huart: UART handle.
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* @note This example shows a simple way to report end of DMA Tx 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_UART_TxCpltCallback(UART_HandleTypeDef *huart)
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{
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/* Toggle LED3 : Transfer in transmission process is correct */
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BSP_LED_On(LED3);
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}
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/**
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* @brief Rx Transfer completed callback
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* @param huart: UART handle
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* @note This example shows a simple way to report end of DMA Rx 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_UART_RxCpltCallback(UART_HandleTypeDef *huart)
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{
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/* Turn LED4 on: Transfer in reception process is correct */
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BSP_LED_On(LED4);
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}
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/**
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* @brief UART error callbacks
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* @param huart: UART 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_UART_ErrorCallback(UART_HandleTypeDef *huart)
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{
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/* Turn LED4 off: Transfer error in reception/transmission process */
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BSP_LED_Off(LED4);
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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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