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目录
本文以stm32f103c8t6系列芯片为例,使用自定义函数发送串口数据。
PA2为TX引脚,PA3为RX引脚
- void usart2_init(u32 bound)
- {
- //GPIO端口设置
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能USART2,GPIOA时钟
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
- //USART2_TX GPIOA.2
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.2
-
- //USART2_RX GPIOA.3初始化
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
- GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.3
-
- //Usart2 NVIC 配置
- NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
- NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
-
- //USART 初始化设置
-
- USART_InitStructure.USART_BaudRate = bound;//串口波特率
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
- USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
- USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
-
- USART_Init(USART2, &USART_InitStructure); //初始化串口2
- USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启串口接受中断
- USART_ITConfig(USART2,USART_IT_IDLE,ENABLE);
- USART_Cmd(USART2, ENABLE); //使能串口2
-
- }
第一个变量是发送的数据,第二个变量为发送的数据的长度
- void usart2_send(unsigned char *data,unsigned char len)
- {
- unsigned char t;
- for(t=0;t<len;t++)
- {
- while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);
- USART_SendData(USART2,data[t]);
- }
- }
例:
usart2_send((uint8_t*)"xiaoliCL\r\n",12);
使用效果:
一直发送字符串“xiaoliCL\r\n”
- void usart2_SendByte(char dat)
- {
- USART_SendData(USART2, (unsigned char) dat);
- while (!(USART2->SR & USART_FLAG_TXE));
- }
例:
usart2_SendByte('a');
使用效果:
一直发送字符 'a'
- #define USART2_MAX_RECV_LEN 600 //最大接收缓存字节数
- u8 USART2_RX_BUF[USART2_MAX_RECV_LEN];
- void u2_printf(char* fmt,...)
- {
- u16 i,j;
- va_list ap;
- va_start(ap,fmt);
- vsprintf((char*)USART2_TX_BUF,fmt,ap);
- va_end(ap);
- i=strlen((const char*)USART2_TX_BUF);//此次发送数据的长度
- for(j=0;j<i;j++)//循环发送数据
- {
- while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET); //等待上次传输完成
- USART_SendData(USART2,(uint8_t)USART2_TX_BUF[j]); //发送数据到串口2
- }
- }
使用方法和printf一样,例:
u2_printf("xiaoliCL2\r\n");
使用效果:
- #include "sys.h"
- #include "usart2.h"
- #include "delay.h"
- #include "stdarg.h"
- #include "stdio.h"
- #include "string.h"
- #include "user_peripheral.h"
-
- #if USART2_Pre
-
- u8 Uart2Buff;
- u8 USART2_TX_BUF[USART2_MAX_SEND_LEN]; //发送缓冲,最大USART2_MAX_SEND_LEN字节
-
-
- void usart2_init(u32 bound)
- {
- //GPIO端口设置
- GPIO_InitTypeDef GPIO_InitStructure;
- USART_InitTypeDef USART_InitStructure;
- NVIC_InitTypeDef NVIC_InitStructure;
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能USART2,GPIOA时钟
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
- //USART2_TX GPIOA.2
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
- GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.2
-
- //USART2_RX GPIOA.3初始化
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA3
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
- GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.3
-
- //Usart2 NVIC 配置
- NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
- NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
-
- //USART 初始化设置
-
- USART_InitStructure.USART_BaudRate = bound;//串口波特率
- USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
- USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
- USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
-
- USART_Init(USART2, &USART_InitStructure); //初始化串口2
- USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启串口接受中断
- USART_ITConfig(USART2,USART_IT_IDLE,ENABLE);
- USART_Cmd(USART2, ENABLE); //使能串口2
-
- }
-
- void usart2_send(unsigned char *data,unsigned char len)
- {
- unsigned char t;
- for(t=0;t<len;t++)
- {
- while(USART_GetFlagStatus(USART2,USART_FLAG_TC)!=SET);
- USART_SendData(USART2,data[t]);
- }
- }
-
- void usart2_SendByte(char dat)
- {
- USART_SendData(USART2, (unsigned char) dat);
- while (!(USART2->SR & USART_FLAG_TXE));
- }
-
- void USART2_IRQHandler(void) //串口2中断服务程序
- {
-
- if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
- {
- Uart2Buff=USART_ReceiveData(USART2); //读取接收
-
- }
-
- }
-
- #define USART2_MAX_RECV_LEN 600 //最大接收缓存字节数
- u8 USART2_RX_BUF[USART2_MAX_RECV_LEN];
- void u2_printf(char* fmt,...)
- {
- u16 i,j;
- va_list ap;
- va_start(ap,fmt);
- vsprintf((char*)USART2_TX_BUF,fmt,ap);
- va_end(ap);
- i=strlen((const char*)USART2_TX_BUF);//此次发送数据的长度
- for(j=0;j<i;j++)//循环发送数据
- {
- while(USART_GetFlagStatus(USART2,USART_FLAG_TC)==RESET); //等待上次传输完成
- USART_SendData(USART2,(uint8_t)USART2_TX_BUF[j]); //发送数据到串口2
- }
- }
-
-
- #endif
-
-
-
- #ifndef __USART2_H
- #define __USART2_H
- #include "sys.h"
-
-
- #define USART2_MAX_SEND_LEN 600 //最大发送缓存字节数
- void usart2_send(unsigned char *data,unsigned char len);
- void usart2_init(u32 bound); //串口2初始化
- void u2_printf(char* fmt,...);
- void usart2_SendByte(char dat);
- #endif
串口发送:
- while(1)
- {
- // usart2_send((uint8_t*)"xiaoliCL\r\n",12);
- // u2_printf("xiaoliCL2\r\n");
- // usart2_SendByte('a');
- delay_ms(1000);
- }
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