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蓝牙项目步骤

1.蓝牙模块AT模式基础配置
        1.蓝牙连接 ch340模块接线 TX、RX、VCC、GND、EN五根引脚      

        2.AT指令配置波特率、蓝牙名称、从模式、配对密码

2.蓝牙硬件连接32单片机

蓝牙模块CND接单片机GND

蓝牙模块VCC接单片机5V

蓝牙模块RXD接收端接单片机PA2

蓝牙模块TXD接收端接单片机PA3

3.初始化蓝牙连接串口的时钟，引脚和外设配置

初始化函数：

void myusart2_init(void)
{GPIO_InitTypeDef GPIOInitStruct;USART_InitTypeDef USART_InitStruct;NVIC_InitTypeDef NVIC_InitStruct;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);GPIOInitStruct.GPIO_Mode=GPIO_Mode_AF_PP;GPIOInitStruct.GPIO_Pin=GPIO_Pin_2;GPIOInitStruct.GPIO_Speed=GPIO_Speed_10MHz;GPIO_Init(GPIOA, &GPIOInitStruct);GPIOInitStruct.GPIO_Mode=GPIO_Mode_IPU;GPIOInitStruct.GPIO_Pin=GPIO_Pin_3;GPIO_Init(GPIOA, &GPIOInitStruct);USART_InitStruct.USART_BaudRate=9600;USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStruct.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;USART_InitStruct.USART_Parity=USART_Parity_No;USART_InitStruct.USART_StopBits=USART_StopBits_1;USART_InitStruct.USART_WordLength=USART_WordLength_8b;NVIC_InitStruct.NVIC_IRQChannel=USART2_IRQn;NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=0;NVIC_InitStruct.NVIC_IRQChannelSubPriority=0;NVIC_Init(&NVIC_InitStruct);USART_Init(USART2,&USART_InitStruct);USART_Cmd(USART2, ENABLE);USART_ITConfig(USART2,USART_IT_RXNE, ENABLE);
}

4.串口接收中断服务函数实现数据的接收和发送

void USART2_IRQHandler()
{char str;if(USART_GetITStatus(USART2,USART_IT_RXNE)!=RESET){str=USART_ReceiveData(USART2);printf("receive:%c  \r\n",str);if(str=='1'){GPIO_ResetBits(GPIOA,GPIO_Pin_1);printf("led open  \r\n");}if(str=='0'){GPIO_SetBits(GPIOA,GPIO_Pin_1);printf("led close  \r\n");}USART_ClearITPendingBit(USART2,USART_IT_RXNE);}}	

具体实现代码

usart.c

#include "stm32f10x.h"
#include "usart.h"
#include "stdio.h"void myusart_init(void)
{GPIO_InitTypeDef GPIOInitStruct;USART_InitTypeDef USART_InitStruct;NVIC_InitTypeDef NVIC_InitStruct;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);GPIOInitStruct.GPIO_Mode=GPIO_Mode_AF_PP;GPIOInitStruct.GPIO_Pin=GPIO_Pin_9;GPIOInitStruct.GPIO_Speed=GPIO_Speed_10MHz;GPIO_Init(GPIOA, &GPIOInitStruct);GPIOInitStruct.GPIO_Mode=GPIO_Mode_IPU;GPIOInitStruct.GPIO_Pin=GPIO_Pin_10;GPIO_Init(GPIOA, &GPIOInitStruct);USART_InitStruct.USART_BaudRate=115200;USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStruct.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;USART_InitStruct.USART_Parity=USART_Parity_No;USART_InitStruct.USART_StopBits=USART_StopBits_1;USART_InitStruct.USART_WordLength=USART_WordLength_8b;NVIC_InitStruct.NVIC_IRQChannel=USART1_IRQn;NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=0;NVIC_InitStruct.NVIC_IRQChannelSubPriority=0;NVIC_Init(&NVIC_InitStruct);USART_Init(USART1,&USART_InitStruct);USART_Cmd(USART1, ENABLE);USART_ITConfig(USART1,USART_IT_RXNE, ENABLE);
}
void myusart2_init(void)
{GPIO_InitTypeDef GPIOInitStruct;USART_InitTypeDef USART_InitStruct;NVIC_InitTypeDef NVIC_InitStruct;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);GPIOInitStruct.GPIO_Mode=GPIO_Mode_AF_PP;GPIOInitStruct.GPIO_Pin=GPIO_Pin_2;GPIOInitStruct.GPIO_Speed=GPIO_Speed_10MHz;GPIO_Init(GPIOA, &GPIOInitStruct);GPIOInitStruct.GPIO_Mode=GPIO_Mode_IPU;GPIOInitStruct.GPIO_Pin=GPIO_Pin_3;GPIO_Init(GPIOA, &GPIOInitStruct);USART_InitStruct.USART_BaudRate=9600;USART_InitStruct.USART_HardwareFlowControl=USART_HardwareFlowControl_None;USART_InitStruct.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;USART_InitStruct.USART_Parity=USART_Parity_No;USART_InitStruct.USART_StopBits=USART_StopBits_1;USART_InitStruct.USART_WordLength=USART_WordLength_8b;NVIC_InitStruct.NVIC_IRQChannel=USART2_IRQn;NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=0;NVIC_InitStruct.NVIC_IRQChannelSubPriority=0;NVIC_Init(&NVIC_InitStruct);USART_Init(USART2,&USART_InitStruct);USART_Cmd(USART2, ENABLE);USART_ITConfig(USART2,USART_IT_RXNE, ENABLE);
}
void My_Usart_Send_Byte(USART_TypeDef* USARTx,uint16_t Data)
{USART_SendData(USARTx, Data);while(USART_GetFlagStatus(USARTx,USART_FLAG_TXE)==RESET);}
void My_Usart_Send_Sting(USART_TypeDef* USARTx,char* str)
{uint16_t  i=0;do{My_Usart_Send_Byte(USARTx,*(str+i));i++;}while(*(str+i)!='\0');while(USART_GetFlagStatus(USARTx,USART_FLAG_TC)==RESET);}
int fputc(int ch,FILE *p)
{USART_SendData(USART1,(u8)ch);while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);return ch;
}void USART1_IRQHandler()
{char str;if(USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET){str=USART_ReceiveData(USART1);printf("receive:%c  \r\n",str);if(str=='0'){GPIO_ResetBits(GPIOA,GPIO_Pin_1);printf("led open  \r\n");}if(str=='1'){GPIO_SetBits(GPIOA,GPIO_Pin_1);printf("led close  \r\n");}USART_ClearITPendingBit(USART1,USART_IT_RXNE);}}	
void USART2_IRQHandler()
{char str;if(USART_GetITStatus(USART2,USART_IT_RXNE)!=RESET){str=USART_ReceiveData(USART2);printf("receive:%c  \r\n",str);if(str=='1'){GPIO_ResetBits(GPIOA,GPIO_Pin_1);printf("led open  \r\n");}if(str=='0'){GPIO_SetBits(GPIOA,GPIO_Pin_1);printf("led close  \r\n");}USART_ClearITPendingBit(USART2,USART_IT_RXNE);}}	

main.c代码

#include "stm32f10x.h"
#include "main.h"
#include "led.h"
#include "usart.h"
#include "stdio.h"int  main()
{LED_Init();myusart_init();myusart2_init();while(1){}}

手机端蓝牙输入调试

输入1时灯亮，并打印在电脑 

输入0时灯灭，并打印在电脑