STM32 drives hc05 Bluetooth serial port communication module

Preface

Don't stumble on time , Tao cannot be empty .

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Today, I would like to share what I learned recently HC05 Bluetooth module , By using Mobile phone Bluetooth control STM32 Single chip microcomputer Conduct Lighting 、 To transmit data 、 Display waveform And so on .

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One 、 Introduce

HC05 Module is a high-performance master-slave Bluetooth serial port module , To put it bluntly , It's just a Bluetooth to serial device , You only need to know how to program the serial port , That's all right. , Realize the so-called transparent transmission .

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preparation

• STM32H750VBT6
• IDE：Keil5
• STM32CubeMX
• VOFA+ Serial debugging

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Two 、 Mobile phone Bluetooth control STM32 Single chip microcomputer

• Mobile phone via Bluetooth , towards STM32 SCM sends messages ,STM32 After receiving the message, return it to the mobile phone intact , It can also be modified to , Mobile phones send specific messages , then ,STM32 The single chip microcomputer makes the corresponding action . such as ： Lighten up LED、 Start the motor 、 Display waveform wait .

Connection instructions ：

Packet format ：

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3、 ... and 、STM32 Control procedures

/* USER CODE BEGIN Includes */

#include "stdio.h"
#include "math.h"
#include "stdarg.h"

#define CONSOLEBUF_SIZE 256

/* USER CODE END Includes */

/* USER CODE BEGIN PTD */

static char Uart_buf[CONSOLEBUF_SIZE];

void PrintfDebugUart(const char *fmt, ...)
{
    
	va_list args;
	va_start(args, fmt);
	int length = vsnprintf(Uart_buf, sizeof(Uart_buf) - 1, fmt, args);
	va_end(args);
	
	HAL_UART_Transmit(&huart1, (uint8_t *)&Uart_buf, length, 0xffff);
}

/* USER CODE END PTD */

/* USER CODE BEGIN PD */

uint8_t RxBuffer[4];		// Variables that receive packets 
uint8_t TxBuffer[4];		// Variables that send packets 
uint8_t wave[100] = {
    0}; 

/* USER CODE END PD */

  /* USER CODE BEGIN 2 */

	PrintfDebugUart("wang_Test.\r\n");
	
	for(int i=0; i<100; i++)
	{
    
		wave[i] = (sin(2 * 3.1415926 * i / 100) + 1) * 100 / 2;		// Virtual data 
	}
	
	HAL_UART_Receive_IT(&huart1, RxBuffer, 4);		// Cycle enable , Keep accepting 
	
  /* USER CODE END 2 */

/* USER CODE BEGIN 4 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)  // Interrupt service function 
{
    
	if(huart == &huart1)
	{
    
		switch(RxBuffer[1])
		{
    
			case 1:
			{
    
				HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_RESET);
				PrintfDebugUart("LED IS OFF.\r\n");
			}break;
			case 2:
			{
    
				HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_SET);
				for(uint16_t i=0; i<100; i++)
				{
    
					TxBuffer[0] = 0xA5;
					TxBuffer[1] = wave[i];
					TxBuffer[2] = TxBuffer[1];
					TxBuffer[3] = 0x5A;
					HAL_UART_Transmit(&huart1,TxBuffer,4,0xffff);
				}
				PrintfDebugUart("LED IS OPEN.\r\n");
			}break;
			case 3:
			{
    
				PrintfDebugUart("Over.\r\n");
			}
			
			default:
			{
    
				;
			}
		}
		HAL_UART_Receive_IT(&huart1, RxBuffer, 4);		// Cycle enable , In order to continuously receive 
	}
}
/* USER CODE END 4 */

experimental result

Display waveform on mobile phone , And you can control the light on and off by pressing the key ：