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从网上找的资料，输出数据比较稳定，hal库版本使用的是软件IIC，注释就不添加特别多了，绝对可用，HAL库版本的MAX30102血氧模块
- uint32_t un_min, un_max, un_prev_data;
- int i;
- int32_t n_brightness;
- float f_temp;
- u8 temp_num=0;
- u8 temp[6];
- u8 str[100];
- u8 dis_hr=0,dis_spo2=0;
- /* USER CODE END 1 */
- /* MCU Configuration----------------------------------------------------------*/
- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
- HAL_Init();
- /* USER CODE BEGIN Init */
- /* USER CODE END Init */
- /* Configure the system clock */
- SystemClock_Config();
- /* USER CODE BEGIN SysInit */
- /* USER CODE END SysInit */
- /* Initialize all configured peripherals */
- MX_GPIO_Init();
- MX_DMA_Init();
- MX_TIM4_Init();
- MX_USART1_UART_Init();
- /* USER CODE BEGIN 2 */
-
- delay_init();
- max30102_init();
- /* USER CODE END 2 */
- /* Infinite loop */
- /* USER CODE BEGIN WHILE */
- un_min=0x3FFFF;
- un_max=0;
-
- n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps
- //read the first 500 samples, and determine the signal range
- for(i=0;i<n_ir_buffer_length;i++)
- {
- while(MAX30102_INT==1); //wait until the interrupt pin asserts
- max30102_FIFO_ReadBytes(REG_FIFO_DATA,temp);
- aun_red_buffer[i] = (long)((long)((long)temp[0]&0x03)<<16) | (long)temp[1]<<8 | (long)temp[2]; // Combine values to get the actual number
- aun_ir_buffer[i] = (long)((long)((long)temp[3] & 0x03)<<16) |(long)temp[4]<<8 | (long)temp[5]; // Combine values to get the actual number
- if(un_min>aun_red_buffer[i])
- un_min=aun_red_buffer[i]; //update signal min
- if(un_max<aun_red_buffer[i])
- un_max=aun_red_buffer[i]; //update signal max
- }
- un_prev_data=aun_red_buffer[i];
- //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples)
- maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid);
- while (1)
- {
- /* USER CODE END WHILE */
- /* USER CODE BEGIN 3 */
- i=0;
- un_min=0x3FFFF;
- un_max=0;
-
- //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top
- for(i=100;i<500;i++)
- {
- aun_red_buffer[i-100]=aun_red_buffer[i];
- aun_ir_buffer[i-100]=aun_ir_buffer[i];
- //update the signal min and max
- if(un_min>aun_red_buffer[i])
- un_min=aun_red_buffer[i];
- if(un_max<aun_red_buffer[i])
- un_max=aun_red_buffer[i];
- }
- //take 100 sets of samples before calculating the heart rate.
- for(i=400;i<500;i++)
- {
- un_prev_data=aun_red_buffer[i-1];
- while(MAX30102_INT==1);
- max30102_FIFO_ReadBytes(REG_FIFO_DATA,temp);
- aun_red_buffer[i] = (long)((long)((long)temp[0]&0x03)<<16) | (long)temp[1]<<8 | (long)temp[2]; // Combine values to get the actual number
- aun_ir_buffer[i] = (long)((long)((long)temp[3] & 0x03)<<16) |(long)temp[4]<<8 | (long)temp[5]; // Combine values to get the actual number
- if(aun_red_buffer[i]>un_prev_data)
- {
- f_temp=aun_red_buffer[i]-un_prev_data;
- f_temp/=(un_max-un_min);
- f_temp*=MAX_BRIGHTNESS;
- n_brightness-=(int)f_temp;
- if(n_brightness<0)
- n_brightness=0;
- }
- else
- {
- f_temp=un_prev_data-aun_red_buffer[i];
- f_temp/=(un_max-un_min);
- f_temp*=MAX_BRIGHTNESS;
- n_brightness+=(int)f_temp;
- if(n_brightness>MAX_BRIGHTNESS)
- n_brightness=MAX_BRIGHTNESS;
- }
- //send samples and calculation result to terminal program through UART
- if(ch_hr_valid == 1 && n_heart_rate<120)//**/ ch_hr_valid == 1 && ch_spo2_valid ==1 && n_heart_rate<120 && n_sp02<101
- {
- dis_hr = n_heart_rate;
- dis_spo2 = n_sp02;
- }
- else
- {
- dis_hr = 0;
- dis_spo2 = 0;
- }
- printf("HR=%i, ", n_heart_rate);
- printf("HRvalid=%i, ", ch_hr_valid);
- printf("SpO2=%i, ", n_sp02);
- printf("SPO2Valid=%i\r\n", ch_spo2_valid);
- }
- maxim_heart_rate_and_oxygen_saturation(aun_ir_buffer, n_ir_buffer_length, aun_red_buffer, &n_sp02, &ch_spo2_valid, &n_heart_rate, &ch_hr_valid);
使用引脚，INT接PB9 SCL接PB7 SDA接PB9 VCC接3.3V GND接GND |
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