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STM32CubeF1/Projects/STM32F103RB-Nucleo/Examples/UART/UART_HyperTerminal_DMA/Src/main.c

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/**
******************************************************************************
* @file UART/UART_HyperTerminal_DMA/Src/main.c
* @author MCD Application Team
* @brief This sample code shows how to use UART HAL API to transmit
* and receive a data buffer with a communication process based on
* DMA transfer.
* The communication is done with the Hyperterminal PC application.
******************************************************************************
* @attention
*
* <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F1xx_HAL_Examples
* @{
*/
/** @addtogroup UART_Hyperterminal_DMA
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* UART handler declaration */
UART_HandleTypeDef UartHandle;
/* Buffer used for transmission */
uint8_t aTxBuffer[] = "\n\r ****UART-Hyperterminal communication based on DMA****\n\r Enter 10 characters using keyboard :\n\r";
/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* STM32F103xB HAL library initialization:
- Configure the Flash prefetch
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization
*/
HAL_Init();
/* Configure the system clock to 64 MHz */
SystemClock_Config();
/* Configure LED2 */
BSP_LED_Init(LED2);
/*##-1- Configure the UART peripheral ######################################*/
/* Put the USART peripheral in the Asynchronous mode (UART Mode) */
/* UART configured as follows:
- Word Length = 8 Bits (7 data bit + 1 parity bit) :
BE CAREFUL : Program 7 data bits + 1 parity bit in PC HyperTerminal
- Stop Bit = One Stop bit
- Parity = ODD parity
- BaudRate = 9600 baud
- Hardware flow control disabled (RTS and CTS signals) */
UartHandle.Instance = USARTx;
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_ODD;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
if (HAL_UART_Init(&UartHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*##-2- Start the transmission process #####################################*/
/* User start transmission data through "TxBuffer" buffer */
if (HAL_UART_Transmit_DMA(&UartHandle, (uint8_t *)aTxBuffer, TXBUFFERSIZE) != HAL_OK)
{
/* Transfer error in transmission process */
Error_Handler();
}
/*##-3- Put UART peripheral in reception process ###########################*/
/* Any data received will be stored in "RxBuffer" buffer : the number max of
data received is 10 */
if (HAL_UART_Receive_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
{
/* Transfer error in reception process */
Error_Handler();
}
/*##-4- 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<69>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_UART_GetState(&UartHandle) != HAL_UART_STATE_READY)
{
}
/*##-5- Send the received Buffer ###########################################*/
if (HAL_UART_Transmit_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
{
/* Transfer error in transmission process */
Error_Handler();
}
/*##-6- 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<69>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_UART_GetState(&UartHandle) != HAL_UART_STATE_READY)
{
}
/* Infinite loop */
while (1)
{
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSI)
* SYSCLK(Hz) = 64000000
* HCLK(Hz) = 64000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* PLLMUL = 16
* Flash Latency(WS) = 2
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
RCC_ClkInitTypeDef clkinitstruct = {0};
RCC_OscInitTypeDef oscinitstruct = {0};
/* Configure PLL ------------------------------------------------------*/
/* PLL configuration: PLLCLK = (HSI / 2) * PLLMUL = (8 / 2) * 16 = 64 MHz */
/* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 64 / 1 = 64 MHz */
/* Enable HSI and activate PLL with HSi_DIV2 as source */
oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
oscinitstruct.HSEState = RCC_HSE_OFF;
oscinitstruct.LSEState = RCC_LSE_OFF;
oscinitstruct.HSIState = RCC_HSI_ON;
oscinitstruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
oscinitstruct.PLL.PLLState = RCC_PLL_ON;
oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL16;
if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
{
/* Initialization Error */
while(1);
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
{
/* Initialization Error */
while(1);
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Toogle LED2 for error */
while(1)
{
BSP_LED_Toggle(LED2);
HAL_Delay(1000);
}
}
/**
* @brief Tx Transfer completed callback
* @param huart: UART handle.
* @note This example shows a simple way to report end of DMA Tx transfer, and
* you can add your own implementation.
* @retval None
*/
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
/* Toogle LED2 : Transfer in transmission process is correct */
BSP_LED_On(LED2);
}
/**
* @brief Rx Transfer completed callback
* @param huart: UART handle
* @note This example shows a simple way to report end of DMA Rx transfer, and
* you can add your own implementation.
* @retval None
*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
/* Turn LED2 on: Transfer in reception process is correct */
BSP_LED_On(LED2);
}
/**
* @brief UART error callbacks
* @param huart: UART handle
* @note This example shows a simple way to report transfer error, and you can
* add your own implementation.
* @retval None
*/
void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)
{
/* Turn LED2 off: Transfer error in reception/transmission process */
BSP_LED_Off(LED2);
}
#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
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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