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124 lines
3.7 KiB
124 lines
3.7 KiB
#include "sys.h"
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#include "usart.h"
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//////////////////////////////////////////////////////////////////////////////////
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//如果使用ucos,则包括下面的头文件即可.
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#if SYSTEM_SUPPORT_OS
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#include "includes.h" //ucos 使用
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#endif
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//////////////////////////////////////////////////////////////////
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//加入以下代码,支持printf函数,而不需要选择use MicroLIB
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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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{
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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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//串口1中断服务程序
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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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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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NVIC_InitTypeDef NVIC_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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//Usart1 NVIC 配置
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
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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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//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_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_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
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USART_Cmd(USART1, ENABLE); //使能串口1
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}
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void USART1_IRQHandler(void) //串口1中断服务程序
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{
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u8 Res;
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#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
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OSIntEnter();
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#endif
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if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
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{
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Res =USART_ReceiveData(USART1); //读取接收到的数据
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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 USART_RX_STA|=0x8000; //接收完成了
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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>(USART_REC_LEN-1))USART_RX_STA=0;//接收数据错误,重新开始接收
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}
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}
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}
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}
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#if SYSTEM_SUPPORT_OS //如果SYSTEM_SUPPORT_OS为真，则需要支持OS.
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OSIntExit();
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#endif
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}
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#endif
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