217 lines
6.8 KiB
C
217 lines
6.8 KiB
C
/**
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******************************************************************************
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* @file UART/UART_Printf/Src/main.c
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* @author MCD Application Team
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* @brief This example shows how to retarget the C library printf function
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* to the UART.
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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_Printf
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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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/* Private function prototypes -----------------------------------------------*/
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#ifdef __GNUC__
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/* With GCC, small printf (option LD Linker->Libraries->Small printf
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set to 'Yes') calls __io_putchar() */
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#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
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#else
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#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
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#endif /* __GNUC__ */
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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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/* STM32F103xB 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 64 MHz */
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SystemClock_Config();
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/* Initialize BSP Led for LED2 */
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BSP_LED_Init(LED2);
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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 (7 data bit + 1 parity bit) : BE CAREFUL : Program 7 data bits + 1 parity bit in PC HyperTerminal
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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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/* Output a message on Hyperterminal using printf function */
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printf("\n\r UART Printf Example: retarget the C library printf function to the UART\n\r");
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printf("** Test finished successfully. ** \n\r");
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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 Retargets the C library printf function to the USART.
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* @param None
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* @retval None
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*/
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PUTCHAR_PROTOTYPE
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{
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/* Place your implementation of fputc here */
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/* e.g. write a character to the USART1 and Loop until the end of transmission */
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HAL_UART_Transmit(&UartHandle, (uint8_t *)&ch, 1, 0xFFFF);
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return ch;
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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) = 64000000
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* HCLK(Hz) = 64000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* PLLMUL = 16
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* Flash Latency(WS) = 2
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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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/* Configure PLL ------------------------------------------------------*/
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/* PLL configuration: PLLCLK = (HSI / 2) * PLLMUL = (8 / 2) * 16 = 64 MHz */
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/* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 64 / 1 = 64 MHz */
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/* Enable HSI and activate PLL with HSi_DIV2 as source */
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oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
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oscinitstruct.HSEState = RCC_HSE_OFF;
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oscinitstruct.LSEState = RCC_LSE_OFF;
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oscinitstruct.HSIState = RCC_HSI_ON;
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oscinitstruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
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oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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oscinitstruct.PLL.PLLState = RCC_PLL_ON;
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oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
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oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL16;
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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_DIV2;
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if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= 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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/* Turn LED2 on */
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BSP_LED_On(LED2);
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while (1)
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{
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}
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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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