137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/******************** (C) COPYRIGHT 2020 GEEKIMU *******************************
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* File Name : usart.c
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* Current Version : V2.0 & ST 3.5.0
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* Author : zhanli 719901725@qq.com & JustFeng.
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* Date of Issued : 2019.5.26 zhanli : Create
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* Comments : STM32 串口驱动
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********************************************************************************/
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#include "sys.h"
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#include "usart.h"
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#include "stm32f10x_gpio.h"
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#include "stm32f10x_usart.h"
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#include "stm32f10x_rcc.h"
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#if 1
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#pragma import(__use_no_semihosting)
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//标准库需要的支持函数
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struct __FILE {
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int handle;
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};
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FILE __stdout;
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//定义_sys_exit()以避免使用半主机模式
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_sys_exit(int x)
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{
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x = x;
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}
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//重定义fputc函数
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int fputc(int ch, FILE *f)
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{
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while((USART1->SR&0X40)==0);//循环发送,直到发送完毕
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USART1->DR = (u8) ch;
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return ch;
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}
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#endif
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#if EN_USART1_RX //如果使能了接收
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//注意,读取USARTx->SR能避免莫名其妙的错误
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u8 USART_RX_BUF[USART_REC_LEN]; //接收缓冲,最大USART_REC_LEN个字节.
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//接收状态
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//bit15， 接收完成标志
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//bit14， 接收到0x0d
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//bit13~0， 接收到的有效字节数目
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u16 USART_RX_STA = 0; //接收状态标记
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/**----------------------------------------------------------------------
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* Function : uart_init
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* Description : STM32 串口1初始化函数
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* Input : bound : 波特率
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* Author : zhanli&719901725@qq.com
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* Date : 2019/5/26 zhanli
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*---------------------------------------------------------------------**/
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void uart_init(u32 bound){
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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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// 使能USART1，GPIOA时钟
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
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// 复位串口1
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USART_DeInit(USART1);
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// USART1_TX PA.9 配置推挽输出
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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// 复用推挽输出
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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// USART1_RX PA.10 配置浮空输入
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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// USART 初始化,一般设置为9600;
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USART_InitStructure.USART_BaudRate = bound;
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// 字长为8位数据格式
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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// 一个停止位
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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// 无奇偶校验位
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USART_InitStructure.USART_Parity = USART_Parity_No;
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// 无硬件数据流控制
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
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// 初始化串口
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USART_Init(USART1, &USART_InitStructure);
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// 开启中断
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USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
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// 使能串口
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USART_Cmd(USART1, ENABLE);
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}
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/**----------------------------------------------------------------------
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* Function : USART1_IRQHandler
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* Description : 串口1中断服务程序
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* Author : zhanli&719901725@qq.com
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* Date : 2019/5/26 zhanli
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*---------------------------------------------------------------------**/
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void USART1_IRQHandler(void)
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{
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u8 Res;
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//接收中断(接收到的数据必须是0x0d 0x0a结尾)
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if(USART_GetITStatus(USART1, USART_IT_RXNE) == RESET)
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return;
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// 读取接收到的数据
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Res = USART_ReceiveData(USART1);
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// 接收完成
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if((USART_RX_STA & 0x8000) != 0)
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return;
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//接收到了0x0d
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if(USART_RX_STA & 0x4000)
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{
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if(Res!=0x0a)USART_RX_STA=0;//接收错误,重新开始
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else USART_RX_STA|=0x8000; //接收完成了
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}else //还没收到0X0D
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{
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if(Res==0x0d)USART_RX_STA|=0x4000;
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else{
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USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
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USART_RX_STA++;
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// 接收数据错误,重新开始接收
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if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;
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}
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}
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}
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#endif
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