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   源码介绍

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max30102心率血氧传感器详细代码

：

int main(void)
{ 
//variables to calculate the on-board LED brightness that reflects the heartbeats
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;

NVIC_Configuration();
delay_init();     //延时函数初始化   
uart_init(9600); //串口初始化为115200
LED_Init();

//OLED
OLED_Init();
OLED_ShowString(0,0,"  initializing  ",16);
OLED_Refresh_Gram();//更新显示到OLED  

max30102_init();

printf("\r\n MAX30102  init  \r\n");

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)
{
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 && 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);

//显示刷新
LED0=0;
if(dis_hr == 0 && dis_spo2 == 0)
{
sprintf((char *)str,"HR:--- SpO2:--- ");
}
else{
sprintf((char *)str,"HR:%3d SpO2:%3d ",dis_hr,dis_spo2);
}
OLED_ShowString(0,0,str,16);
OLED_Fill(0,23,127,63,0);
//红光在上，红外在下
dis_DrawCurve(aun_red_buffer,20);
dis_DrawCurve(aun_ir_buffer,0);
OLED_Refresh_Gram();//更新显示到OLED  
}
}