mirror of
https://github.com/NanjingForestryUniversity/valveboard.git
synced 2025-11-08 22:34:04 +00:00
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include "usart.h"
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#include "stm32f10x.h"
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#include "sys.h"
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void uart_init(u32 bound)
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{
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//GPIO端口设置
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA时钟
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//USART1_TX GPIOA.9
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
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GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化GPIOA.9
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//USART1_RX GPIOA.10初始化
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PA10
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
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GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化GPIOA.10
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//USART 初始化设置
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USART_InitStructure.USART_BaudRate = bound; //串口波特率
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USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式
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USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位
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USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制
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USART_InitStructure.USART_Mode = USART_Mode_Tx; //发模式
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USART_Init(USART1, &USART_InitStructure); //初始化串口1
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USART_Cmd(USART1, ENABLE); //使能串口1
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}
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#if defined(__CC_ARM)
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#pragma import(__use_no_semihosting)
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struct __FILE
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{
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int handle;
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} __stdout;
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void _sys_exit(int x)
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{
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x = x;
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}
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void _ttywrch(int ch)
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{
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ch = ch;
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}
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/**
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* @brief Override fputc in stdlib.
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*/
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int fputc(int ch, FILE *f)
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{
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while ((USART1->SR & 0X40) == 0)
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;
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USART1->DR = (uint8_t)ch;
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return ch;
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}
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#elif defined(__GNUC__)
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#include <errno.h>
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#include <sys/unistd.h> // STDOUT_FILENO, STDERR_FILENO
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int _write(int file, char *data, int len)
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{
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if ((file != STDOUT_FILENO) && (file != STDERR_FILENO))
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{
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errno = EBADF;
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return -1;
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}
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int i = len;
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// arbitrary timeout 1000
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while (i--)
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{
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while ((USART1->SR & 0X40) == 0)
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;
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USART1->DR = *data;
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data++;
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}
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// return # of bytes written - as best we can tell
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return len;
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}
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#endif
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