[问答]

stm32单片机串口如何使用printf及u3_printf？

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问答对人有帮助，内容完整，我也想知道答案 0 STM32 单片机串口如何使用printf及u3_printf？ 0
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答案对人有帮助，有参考价值 0 无论是在51单片机还是在stm32，默认printf串口都是串口一。使用printf的时候头文件为"stdio.h"，但是一些外部设备与单片机连接的时候使用的是串口（通常物联网用到的ESP8266，SIM9600等都是通过串口发送AT指令进行模式的配置的），但是printf函数却只有一个。在单片机中printf函数默认为串口一。所以试想能不能其他串口也组成类似于printf的函数。 printf() 引入头文件 #include 关键部分代码 #ifdef __GNUC__ /* With GCC, small printf (option LD Linker->Libraries->Small printf set to 'Yes') calls __io_putchar() / #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #else #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE f) #endif /* __GNUC__ / / USER CODE BEGIN 1 / PUTCHAR_PROTOTYPE { / Place your implementation of fputc here / / e.g. write a character to the USART2 and Loop until the end of transmission / HAL_UART_Transmit(&huart1, (uint8_t )&ch, 1, 0xFFFF); return ch; } u3_printf() 引入头文件 #include 其文件内容部分为 #ifdef __clang__ typedef __builtin_va_list va_list; #define va_start(ap, param) __builtin_va_start(ap, param) #define va_end(ap) __builtin_va_end(ap) #define va_arg(ap, type) __builtin_va_arg(ap, type) #if __STDC_VERSION__ >= 199900L \|\| __cplusplus >= 201103L \|\| !defined(__STRICT_ANSI__) #define va_copy(dest, src) __builtin_va_copy(dest, src) #endif #else #ifdef __TARGET_ARCH_AARCH64 typedef struct __va_list { void __stack; void __gr_top; void __vr_top; int __gr_offs; int __vr_offs; } va_list; #else typedef struct __va_list { void __ap; } va_list; #endif va_start,va_end,va_arg()是定义其地址，及偏移地址。核心部分代码 1.HAL库函数版本 void u3_printf(char* fmt,...) { u8 buffer[200]; u16 i; va_list ap; va_start(ap,fmt); //ap指向fmt的地址 i = vsprintf(buffer,fmt,ap); //vsprintf返回数组的长度 va_end(ap); HAL_UART_Transmit(&huart3,(u8 )buffer,i,0X00FF); } 2.标准库函数版本 void u3_printf(char fmt,...) { u16 i,j; va_list ap; va_start(ap,fmt); vsprintf((char)USART3_TX_BUF,fmt,ap); va_end(ap); i=strlen((const char)USART3_TX_BUF); //得到数据长度 for(j=0;j { while(USART_GetFlagStatus(USART3,USART_FLAG_TC)==RESET); USART_SendData(USART3,USART3_TX_BUF[j]); } } 以HAL库为例，配置串口文件（直接可以拷贝引用） / **************************************************************************** * File Name : USART.c * Description : This file provides code for the configuration * of the USART instances. **************************************************************************** This notice applies to any and all portions of this file * that are not between comment pairs USER CODE BEGIN and * USER CODE END. Other portions of this file, whether * inserted by the user or by software development tools * are owned by their respective copyright owners. * * COPYRIGHT(c) 2018 STMicroelectronics * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************** / / Includes ------------------------------------------------------------------/ #include "usart.h" #include "gpio.h" #include "time7.h" / USER CODE BEGIN 0 / #include "stdarg.h" #include "string.h" #include "stdio.h" / USER CODE END 0 / #ifdef __GNUC__ / With GCC, small printf (option LD Linker->Libraries->Small printf set to 'Yes') calls __io_putchar() / #define PUTCHAR_PROTOTYPE int __io_putchar(int ch) #else #define PUTCHAR_PROTOTYPE int fputc(int ch, FILE f) #endif /* __GNUC__ / UART_HandleTypeDef huart1; UART_HandleTypeDef huart3; / USART1 init function / void MX_USART1_UART_Init(void) { huart1.Instance = USART1; huart1.Init.BaudRate = 115200; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart1) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } } / USART3 init function / void MX_USART3_UART_Init(void) { huart3.Instance = USART3; huart3.Init.BaudRate = 115200; huart3.Init.WordLength = UART_WORDLENGTH_8B; huart3.Init.StopBits = UART_STOPBITS_1; huart3.Init.Parity = UART_PARITY_NONE; huart3.Init.Mode = UART_MODE_TX_RX; huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart3.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart3) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); } } void HAL_UART_MspInit(UART_HandleTypeDef uartHandle) { GPIO_InitTypeDef GPIO_InitStruct; if(uartHandle->Instance==USART1) { /* USER CODE BEGIN USART1_MspInit 0 / / USER CODE END USART1_MspInit 0 / / USART1 clock enable / __HAL_RCC_USART1_CLK_ENABLE(); /USART1 GPIO Configuration PA9 ------> USART1_TX PA10 ------> USART1_RX / GPIO_InitStruct.Pin = GPIO_PIN_9; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_10; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); /* USART1 interrupt Init / HAL_NVIC_SetPriority(USART1_IRQn, 0, 0); HAL_NVIC_EnableIRQ(USART1_IRQn); / USER CODE BEGIN USART1_MspInit 1 / / USER CODE END USART1_MspInit 1 / } else if(uartHandle->Instance==USART3) { / USER CODE BEGIN USART3_MspInit 0 / / USER CODE END USART3_MspInit 0 / / USART3 clock enable / __HAL_RCC_USART3_CLK_ENABLE(); /USART3 GPIO Configuration PB10 ------> USART3_TX PB11 ------> USART3_RX / GPIO_InitStruct.Pin = GPIO_PIN_10; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_11; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); /* USART3 interrupt Init / __HAL_UART_ENABLE_IT(&huart3,UART_IT_RXNE); HAL_NVIC_SetPriority(USART3_IRQn, 0, 0); HAL_NVIC_EnableIRQ(USART3_IRQn); TIM7_Int_Init(1000-1,9000-1); USART3_RX_STA=0; TIM7->CR1&=~(1<<0); / USER CODE BEGIN USART3_MspInit 1 / / USER CODE END USART3_MspInit 1 / } } void HAL_UART_MspDeInit(UART_HandleTypeDef uartHandle) { if(uartHandle->Instance==USART1) { /* USER CODE BEGIN USART1_MspDeInit 0 / / USER CODE END USART1_MspDeInit 0 / / Peripheral clock disable / __HAL_RCC_USART1_CLK_DISABLE(); /USART1 GPIO Configuration PA9 ------> USART1_TX PA10 ------> USART1_RX / HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9\|GPIO_PIN_10); /* USART1 interrupt Deinit / HAL_NVIC_DisableIRQ(USART1_IRQn); / USER CODE BEGIN USART1_MspDeInit 1 / / USER CODE END USART1_MspDeInit 1 / } else if(uartHandle->Instance==USART3) { / USER CODE BEGIN USART3_MspDeInit 0 / / USER CODE END USART3_MspDeInit 0 / / Peripheral clock disable / __HAL_RCC_USART3_CLK_DISABLE(); /USART3 GPIO Configuration PB10 ------> USART3_TX PB11 ------> USART3_RX / HAL_GPIO_DeInit(GPIOB, GPIO_PIN_10\|GPIO_PIN_11); /* USART3 interrupt Deinit / HAL_NVIC_DisableIRQ(USART3_IRQn); / USER CODE BEGIN USART3_MspDeInit 1 / / USER CODE END USART3_MspDeInit 1 / } } / USER CODE BEGIN 1 / PUTCHAR_PROTOTYPE { / Place your implementation of fputc here / / e.g. write a character to the USART2 and Loop until the end of transmission / HAL_UART_Transmit(&huart1, (uint8_t )&ch, 1, 0xFFFF); return ch; } void u3_printf(char* fmt,...) { u8 buffer[200]; u16 i; va_list ap; va_start(ap,fmt); i = vsprintf(buffer,fmt,ap); va_end(ap); HAL_UART_Transmit(&huart3,(u8 )buffer,i,0X00FF); } / USER CODE END 1 / /* * @} / /* * @} / /********************* (C) COPYRIGHT STMicroelectronics *END OF FILE**/

2021-12-1 14:10:21 评论举报樊周依