嵌入式学习日志————实验：串口发送串口发送+接收
1.配置流程
①开启时钟，把需要用到的USART和GPIO的时钟打开
②GPIO初始化，把TX配置成复用输出，RX配置成输入模式
③配置USART，直接使用一个结构体来配置
④如果只需要发送功能，就直接开启USART，初始化结束了，如果需要接受的功能，那就还需要配置中断：在开启USART之前，加上ITConfig和NVIC的代码
2.库函数
配置同步时钟输出（时钟是否要输出、时钟极性、相位等参数）
`void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct);` `void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct);`
中断输出控制
void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);
开启USART到DMA的触发通道
void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);
发送数据（写DR寄存器）
void USART_SendData(USART_TypeDef* USARTx, uint16_t Data);
接收数据（读DR寄存器）
uint16_t USART_ReceiveData(USART_TypeDef* USARTx);
3.实验一——串口发送~代码
(1）main.c
#include "stm32f10x.h" // Device header
#include "delay.h"
#include "OLED.h"
#include "Serial.h"int main( void)
{OLED_Init();Serial_Init();//Serial_SendByte(0x41);uint8_t MyArray[] = {0x42,0x43,0x44,0x45};Serial_SendArray(MyArray,4);Serial_SendString("\r\nNum1 = ");Serial_SendNumber(123,3);printf("\r\nNum2 = %d",666);char string[100];sprintf(string,"\r\nNum3 = %d",789);Serial_SendString(string);Serial_Printf("\r\nNum4 = %d",456);Serial_Printf("\r\n");while(1){}
}
(2)Serial.h
#ifndef __SERIAL_H
#define __SERIAL_H#include <stdio.h>void Serial_Init(void);
void Serial_SendByte(uint8_t Byte);
void Serial_SendArray(uint8_t *Array,uint16_t Length);
void Serial_SendString(char *String);
void Serial_SendNumber(uint32_t Number,uint8_t Length);void Serial_Printf(char *format,...);#endif
(3)Serial.c
#include "stm32f10x.h"
#include <stdio.h>
#include <stdarg.h>void Serial_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);USART_InitTypeDef USART_InitStructure;USART_InitStructure.USART_BaudRate = 9600; //波特率USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控USART_InitStructure.USART_Mode = USART_Mode_Tx; //发送模式USART_InitStructure.USART_Parity = USART_Parity_No; //校验位USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位USART_InitStructure.USART_WordLength = USART_WordLength_8b;USART_Init(USART1,&USART_InitStructure);USART_Cmd(USART1,ENABLE);
}void Serial_SendByte(uint8_t Byte)
{USART_SendData(USART1,Byte);while (USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET);
}void Serial_SendArray(uint8_t *Array,uint16_t Length)
{uint16_t i;for (i = 0;i < Length;i++){Serial_SendByte(Array[i]);}
}void Serial_SendString(char *String)
{uint16_t i;for (i = 0;String[1] != 0;i++){Serial_SendByte(String[i]);}
}uint32_t Serial_Pow(uint32_t x,uint32_t y)
{uint32_t result = 1;while(y--){result *= x;}return result;
}void Serial_SendNumber(uint32_t Number,uint8_t Length)
{uint8_t i;for(i = 0;i < Length;i++){Serial_SendByte(Number/Serial_Pow(10,Length-i-1)%10+'0');}
}int fputc(int ch,FILE *f) //重定向printf输出到串口{Serial_SendByte(ch);return ch;}void Serial_Printf(char *format,...)
{char string[100];va_list arg;va_start(arg,format);vsprintf(string,format,arg);va_end(arg); //释放参数表Serial_SendString(string);}
4.实验二——串口发送+接收~代码
(1）main.c
#include "stm32f10x.h" // Device header
#include "delay.h"
#include "OLED.h"
#include "Serial.h"uint8_t RxData;int main( void)
{OLED_Init();Serial_Init();while(1){if(Serial_GetRxFlag()==1){RxData = Serial_GetRxData();OLED_ShowHexNum(1,1,RxData,2);}}
}
(2)Serial.h
#ifndef __SERIAL_H
#define __SERIAL_H#include <stdio.h>void Serial_Init(void);
void Serial_SendByte(uint8_t Byte);
void Serial_SendArray(uint8_t *Array,uint16_t Length);
void Serial_SendString(char *String);
void Serial_SendNumber(uint32_t Number,uint8_t Length);void Serial_Printf(char *format,...);uint8_t Serial_GetRxData(void);uint8_t Serial_GetRxFlag(void);void USART1_IRQHandler(void);#endif
(3)Serial.c
#include "stm32f10x.h"
#include <stdio.h>
#include <stdarg.h>uint8_t Serial_RxData;
uint8_t Serial_RxFlag;void Serial_Init(void)
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA,&GPIO_InitStructure);USART_InitTypeDef USART_InitStructure;USART_InitStructure.USART_BaudRate = 9600; //波特率USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; //发送模式USART_InitStructure.USART_Parity = USART_Parity_No; //校验位USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位USART_InitStructure.USART_WordLength = USART_WordLength_8b;USART_Init(USART1,&USART_InitStructure);USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);NVIC_InitTypeDef NVIC_InitStructure;NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_Init(&NVIC_InitStructure);USART_Cmd(USART1,ENABLE);
}void Serial_SendByte(uint8_t Byte)
{USART_SendData(USART1,Byte);while (USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET);
}void Serial_SendArray(uint8_t *Array,uint16_t Length)
{uint16_t i;for (i = 0;i < Length;i++){Serial_SendByte(Array[i]);}
}void Serial_SendString(char *String)
{uint16_t i;for (i = 0;String[1] != 0;i++){Serial_SendByte(String[i]);}
}uint32_t Serial_Pow(uint32_t x,uint32_t y)
{uint32_t result = 1;while(y--){result *= x;}return result;
}void Serial_SendNumber(uint32_t Number,uint8_t Length)
{uint8_t i;for(i = 0;i < Length;i++){Serial_SendByte(Number/Serial_Pow(10,Length-i-1)%10+'0');}
}int fputc(int ch,FILE *f) //重定向printf输出到串口{Serial_SendByte(ch);return ch;}void Serial_Printf(char *format,...)
{char string[100];va_list arg;va_start(arg,format);vsprintf(string,format,arg);va_end(arg); //释放参数表Serial_SendString(string);}uint8_t Serial_GetRxFlag(void)
{if(Serial_RxFlag==1){Serial_RxFlag = 0;return 1;}else{return 0;}
}uint8_t Serial_GetRxData(void)
{return Serial_RxData;
}void USART1_IRQHandler(void)
{if(USART_GetITStatus(USART1,USART_IT_RXNE) ==SET){Serial_RxData = USART_ReceiveData(USART1);Serial_RxFlag = 1;USART_ClearITPendingBit(USART1,USART_IT_RXNE);}
}
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