119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
#include "usart1.h"
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//#include "math.h"
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#include <stdlib.h>
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u8 USART_RX_BUF[64];
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//接收到的数据长度
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unsigned short USART_RX_STA=0; //接收状态标志
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float error;
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void USART1_IRQHandler(void) //串口1中断程序
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{
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unsigned char Res;
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if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //
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{
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Res =USART_ReceiveData(USART1); //读取接收到的字节
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if((USART_RX_STA&0x8000)==0) //接收未完成
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{
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if(USART_RX_STA&0x4000) //接收到了0x0d
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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
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{
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USART_RX_STA|=0x8000; //接收完成
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USART_RX_BUF[USART_RX_STA&0X3FFF]='\0'; //最后一个字节放'0’，方便判断
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}
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}
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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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{
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USART_RX_BUF[USART_RX_STA&0X3FFF]=Res;
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USART_RX_STA++;
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if(USART_RX_STA>(64-1))USART_RX_STA=0; //接收错误，重新开始
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}
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}
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}
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if((USART_RX_STA&0x8000)!=0)
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{
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TX_485;
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switch(USART_RX_BUF[0])
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{
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case 'y': //D
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error = atof((const char *)(USART_RX_BUF+1));
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// error = fabs(error) > 0.02 ? error : 0 ;
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break;
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}
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RX_485;
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USART_RX_STA=0;
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}
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}
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}
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int fputc(int ch,FILE *p) //函数默认的，在使用printf函数时自动调用
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{
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USART_SendData(USART1,(u8)ch);
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while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
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return ch;
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}
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//初始化IO 串口1
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//pclk1:PCLK1时钟频率(Mhz)
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//bound:波特率
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void usart1_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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NVIC_InitTypeDef NVIC_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//TX //串口输出PA9
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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); /* 初始化串口输入IO */
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GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//RX //串口输入PA10
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GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; //模拟输入
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GPIO_Init(GPIOA,&GPIO_InitStructure); /* 初始化GPIO */
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//USART1 初始化设置
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USART_InitStructure.USART_BaudRate = bound;//波特率设置
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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_Rx | USART_Mode_Tx; //收发模式
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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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USART_ClearFlag(USART1, USART_FLAG_TC);
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USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启相关中断
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//Usart1 NVIC 配置
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//串口1中断通道
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2;//抢占优先级2
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NVIC_InitStructure.NVIC_IRQChannelSubPriority =2; //子优先级1
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
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NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
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RX_485;
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}
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