STMCUBEMX_IIC_LL库/HAL库_扫描总线设备

前言：
在很多开发过程中，I2C总线上会挂载多个从机设备，但是又不知道设备的地址是多少，我做一个简单的小工具扫描总线，把地址打印出来就很方便

LL库实例：

void scanI2cDevice(I2C_TypeDef *I2Cx)
{
	for(unsigned char dev_addr = 0; dev_addr < 0x7F; dev_addr++)//扫描I2C总线
	{
		volatile unsigned int overtime = 0;
		LL_I2C_GenerateStartCondition(I2Cx);//起始信号
		while (!LL_I2C_IsActiveFlag_SB(I2Cx) && (overtime < 10000))//起始信号发送完毕
		{
			overtime++;
		}
		if(overtime >= 10000)
		{
			Debug_printf("scanI2cDevice:%02x Start Error!\r\n",dev_addr << 1);
		}

		overtime = 0;
		LL_I2C_TransmitData8(I2Cx, (dev_addr << 1) & 0xFE);//发送器件地址
		while (!LL_I2C_IsActiveFlag_ADDR(I2Cx) && (overtime < 10000))//等待从机回应ACK
		{
			overtime++;
		}
		if(dev_addr%50 == 0)
		{
			Debug_printf("\r\n");
		}
		if(overtime >= 10000)
		{
			Debug_printf("-- ");
		}
		else
		{
			Debug_printf("%02x ",dev_addr << 1);
		}
		
		LL_I2C_ClearFlag_ADDR(I2Cx);
		LL_mDelay(10);
	}
	Debug_printf("\r\n*************scan over***********\r\n");
}

HAL库实例：

void scanI2cDevice(I2C_HandleTypeDef* I2Cx)
{
	HAL_StatusTypeDef result;
	
	printf("\r\n*************start scan***********\r\n");
	for(int addr = 0; addr < 0x7F; addr++)
	{
		result = HAL_I2C_IsDeviceReady(I2Cx, addr << 1, 3, 5);
		if(result != HAL_OK)
		{
			if(addr%50 == 0)
			{
				printf( "--\r\n");
			}
			else
			{
				printf( "-- ");
			}
		}
		if(result == HAL_OK)
		{
			printf("%02x ", addr);
		}
	}
	printf("\r\n*************scan over***********\r\n");
}