103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
#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 "FreeRTOS.h" //FreeRTOS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 defined(__CC_ARM)
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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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void _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((USART2->SR&0X40)==0);//循环发送,直到发送完毕
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USART2->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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//初始化IO 串口1
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//bound:波特率
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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_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//使能USART1时钟
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//串口1对应引脚复用映射
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GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
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GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
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//USART1端口配置
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9与GPIOA10
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度50MHz
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
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GPIO_Init(GPIOA,&GPIO_InitStructure); //初始化PA9，PA10
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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=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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}
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#endif
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