硬件设计

HC-05将蓝牙协议完全封装了，我们只需要将其当作一个蓝牙转串口的模块来使用即可，配置也十分简单，只需要对串口进行配置就能使用。

蓝牙模块接线

蓝牙模块     STM32

TXD<---->RXD

RXD<---->TXD

VCC<---->3V3

GND<---->GND

软件设计

blue_hc05.c

#include "blue_hc05.h"	 

void Blue_Hc05_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	
	RCC_APB1PeriphClockCmd(BLUE_USART_RX_GPIO_CLK|BLUE_USART_TX_GPIO_CLK, ENABLE);
	RCC_APB1PeriphClockCmd(BLUE_USART_CLK, ENABLE);
	/* 连接 PXx 到 USARTx_Tx*/
	GPIO_PinAFConfig(BLUE_USART_RX_GPIO_PORT,BLUE_USART_RX_SOURCE, BLUE_USART_RX_AF);
	/*  连接 PXx 到 USARTx__Rx*/
	GPIO_PinAFConfig(BLUE_USART_TX_GPIO_PORT,BLUE_USART_TX_SOURCE, BLUE_USART_TX_AF);
	
	 /* 配置Tx引脚为复用功能  */
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Pin = BLUE_USART_TX_PIN  ;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(BLUE_USART_TX_GPIO_PORT, &GPIO_InitStructure);

	/* 配置Rx引脚为复用功能 */
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Pin = BLUE_USART_RX_PIN;
	GPIO_Init(BLUE_USART_RX_GPIO_PORT, &GPIO_InitStructure);
  
	//USART 初始化设置
	USART_InitStructure.USART_BaudRate = BLUE_USART_BAUDRATE;//一般设置为9600;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	USART_Init(BLUE_USART, &USART_InitStructure);
	
	/* Configure one bit for preemption priority */
	//NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
	/* 配置中断源 */
	NVIC_InitStructure.NVIC_IRQChannel = BLUE_USART_IRQ;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);
	
	USART_ITConfig(BLUE_USART, USART_IT_RXNE, ENABLE);//开启中断
	USART_Cmd(BLUE_USART, ENABLE);                    //使能串口 
}

// 发送一个
void BLUE_USART_Send_Data(char data)
{
  USART_SendData(BLUE_USART,data);
  while(USART_GetFlagStatus(BLUE_USART,USART_FLAG_TC)==0);  // 除非发送完成  
}

// 发送一串
void BLUE_USART_Send_String(char *String)
{
  u16 len,j;
  len=strlen(String);
  for(j=0;j<len;j++)
  {
    BLUE_USART_Send_Data(*String++);
  }
}

blue_hc05.h

#ifndef __BLUE_HC05_H
#define __BLUE_HC05_H

#include "main.h" 


#define BLUE_USART 						USART2
#define BLUE_USART_CLK 					RCC_APB1Periph_USART2
#define BLUE_USART_BAUDRATE 			9600
#define BLUE_USART_APBxClock_FUN        RCC_APB1PeriphClockCmd


#define BLUE_USART_TX_PIN               GPIO_Pin_2                 
#define BLUE_USART_TX_GPIO_PORT         GPIOA                      
#define BLUE_USART_TX_GPIO_CLK          RCC_AHB1Periph_GPIOA
#define BLUE_USART_TX_AF                GPIO_AF_USART2
#define BLUE_USART_TX_SOURCE            GPIO_PinSource2

#define BLUE_USART_RX_PIN               GPIO_Pin_3                
#define BLUE_USART_RX_GPIO_PORT         GPIOA                      
#define BLUE_USART_RX_GPIO_CLK          RCC_AHB1Periph_GPIOA
#define BLUE_USART_RX_AF                GPIO_AF_USART2
#define BLUE_USART_RX_SOURCE            GPIO_PinSource3

#define BLUE_USART_IRQHandler			USART2_IRQHandler	
#define BLUE_USART_IRQ                 	USART2_IRQn


void Blue_Hc05_Init(void);
void USART3_IRQHandler(void);  
void BLUE_USART_Send_Data(char data);
void BLUE_USART_Send_String(char *String);
#endif

stm32f4xx_it.h 

int Bluetooth_data;
void BLUE_USART_IRQHandler(void)                	    // 串口1中断服务程序
{
	char buf[20];
	if(USART_GetITStatus(BLUE_USART,USART_IT_RXNE)!=RESET)  // 接收中断标志位拉高
	{
		Bluetooth_data=USART_ReceiveData(BLUE_USART);     // 保存接收到的指令
		memset(buf, 0, sizeof(buf));
		sprintf(buf, "blue = %d", Bluetooth_data);
		Gui_DrawFont_GBK16(20,50,BLUE,GRAY0, buf);
	}
}

main.c

int main(void)
{
	Blue_Hc05_Init();
	while (1)
    {
	}
}