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

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/**
******************************************************************************
* @file UART/UART_TwoBoards_ComDMA/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 using 2 Boards.
******************************************************************************
* @attention
*
* Copyright (c) 2016 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 STM32F1xx_HAL_Examples
* @{
*/
/** @addtogroup UART_TwoBoards_ComDMA
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define TRANSMITTER_BOARD
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* UART handler declaration */
UART_HandleTypeDef UartHandle;
__IO ITStatus UartReady = RESET;
__IO uint32_t UserButtonStatus = 0; /* set to 1 after User Button interrupt */
/* Buffer used for transmission */
uint8_t aTxBuffer[] = " ****UART_TwoBoards communication based on DMA**** ****UART_TwoBoards communication based on DMA**** ****UART_TwoBoards communication based on DMA**** ";
/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength);
/* 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);
#ifdef TRANSMITTER_BOARD
/* Configure User push-button in Interrupt mode */
BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);
/* Wait for User push-button press before starting the Communication.
In the meantime, LED2 is blinking */
while(UserButtonStatus == 0)
{
/* Toggle LED2*/
BSP_LED_Toggle(LED2);
HAL_Delay(100);
}
BSP_LED_Off(LED2);
#endif
/*##-1- Configure the UART peripheral ######################################*/
/* Put the USART peripheral in the Asynchronous mode (UART Mode) */
/* UART configured as follows:
- Word Length = 8 Bits
- Stop Bit = One Stop bit
- Parity = None
- 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_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
if(HAL_UART_DeInit(&UartHandle) != HAL_OK)
{
Error_Handler();
}
if(HAL_UART_Init(&UartHandle) != HAL_OK)
{
Error_Handler();
}
#ifdef TRANSMITTER_BOARD
/* The board sends the message and expects to receive it back */
/* DMA is programmed for reception before starting the transmission, in order to
be sure DMA Rx is ready when board 2 will start transmitting */
/*##-2- Program the Reception process #####################################*/
if(HAL_UART_Receive_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
{
Error_Handler();
}
/*##-3- Start the transmission process #####################################*/
/* While the UART in reception process, user can transmit data through
"aTxBuffer" buffer */
if(HAL_UART_Transmit_DMA(&UartHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK)
{
Error_Handler();
}
/*##-4- Wait for the end of the transfer ###################################*/
while (UartReady != SET)
{
}
/* Reset transmission flag */
UartReady = RESET;
#else
/* The board receives the message and sends it back */
/*##-2- Put UART peripheral in reception process ###########################*/
if(HAL_UART_Receive_DMA(&UartHandle, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
{
Error_Handler();
}
/*##-3- Wait for the end of the transfer ###################################*/
/* While waiting for message to come from the other board, LED2 is
blinking according to the following pattern: a double flash every half-second */
while (UartReady != SET)
{
BSP_LED_On(LED2);
HAL_Delay(100);
BSP_LED_Off(LED2);
HAL_Delay(100);
BSP_LED_On(LED2);
HAL_Delay(100);
BSP_LED_Off(LED2);
HAL_Delay(500);
}
/* Reset transmission flag */
UartReady = RESET;
BSP_LED_Off(LED2);
/*##-4- Start the transmission process #####################################*/
/* While the UART in reception process, user can transmit data through
"aTxBuffer" buffer */
if(HAL_UART_Transmit_DMA(&UartHandle, (uint8_t*)aTxBuffer, TXBUFFERSIZE)!= HAL_OK)
{
Error_Handler();
}
#endif /* TRANSMITTER_BOARD */
/*##-5- Wait for the end of the transfer ###################################*/
while (UartReady != SET)
{
}
/* Reset transmission flag */
UartReady = RESET;
/*##-6- Compare the sent and received buffers ##############################*/
if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE))
{
Error_Handler();
}
/* Turn on LED2 if test passes then enter infinite loop */
BSP_LED_On(LED2);
/* 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 Tx Transfer completed callback
* @param UartHandle: 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 *UartHandle)
{
/* Set transmission flag: transfer complete*/
UartReady = SET;
}
/**
* @brief Rx Transfer completed callback
* @param UartHandle: 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 *UartHandle)
{
/* Set transmission flag: transfer complete*/
UartReady = SET;
}
/**
* @brief UART error callbacks
* @param UartHandle: 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 *UartHandle)
{
Error_Handler();
}
/**
* @brief EXTI line detection callbacks
* @param GPIO_Pin: Specifies the pins connected EXTI line
* @retval None
*/
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
if(GPIO_Pin == USER_BUTTON_PIN)
{
UserButtonStatus = 1;
}
}
/**
* @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;
}
pBuffer1++;
pBuffer2++;
}
return 0;
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
static void Error_Handler(void)
{
/* Turn LED2 on */
BSP_LED_On(LED2);
while(1)
{
/* Error if LED2 is slowly blinking (1 sec. period) */
BSP_LED_Toggle(LED2);
HAL_Delay(1000);
}
}
#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
/**
* @}
*/
/**
* @}
*/
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