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：
cpp
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
cpp
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
cpp
#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
cpp
#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
