usart1.c
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#include "usart1.h"
#include "dev.h"
#include "delay.h"
#include "string.h"
#define USART1_RX_MAX 40
#define USART1_TX_MAX 40
uint8_t USART1_RX_BUF[USART1_RX_MAX] = {0}; //接收缓存区
uint8_t USART1_TX_BUF[USART1_TX_MAX] = {0}; //发送缓存区
Uart_Type u1;
void usart1_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); //使能USART1时钟
GPIO_PinAFConfig(DBG_RXD_Port,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
GPIO_PinAFConfig(DBG_TXD_Port,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
GPIO_InitStructure.GPIO_Pin = DBG_RXD_Pin | DBG_TXD_Pin; //GPIOA9与GPIOA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //复用功能
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //速度50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
GPIO_Init(DBG_RXD_Port,&GPIO_InitStructure); //初始化
USART_InitStructure.USART_BaudRate = U1_BAUDRETE; //波特率设置
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(USART1, &USART_InitStructure); //初始化串口1
USART_Cmd(USART1, ENABLE); //使能串口1
}
void usart1_send_byte(uint8_t one_byte)
{
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)!=SET);//等待发送结束
USART_SendData(USART1,one_byte); //向串口3发送数据
}
uint8_t usart1_read_byte(uint8_t* c)
{
if ( USART_GetFlagStatus(USART1, USART_FLAG_RXNE) != RESET)
{
*c = USART_ReceiveData(USART1);
return 1;
}
else
{
return 0;
}
}