心拍・酸素飽和度モニタモジュール MAXREFDES117から取得した心拍の値をシリアルコンソールに表示するプログラムです。
Fork of microbit-component-display by
main.cpp
- Committer:
- JKsoft_main
- Date:
- 2018-04-16
- Revision:
- 1:83ace7df2c63
- Parent:
- 0:0c37474c8541
File content as of revision 1:83ace7df2c63:
#include "MicroBit.h" #include "MAX30102.h" #include "algorithm.h" MAX30102 sensor(I2C_SDA0, I2C_SCL0); MicroBitDisplay display; DigitalIn INT(P0_16); Serial pc(USBTX, USBRX); #define MAX_BRIGHTNESS 255 uint32_t aun_ir_buffer[500]; //IR LED sensor data int32_t n_ir_buffer_length; //data length uint32_t aun_red_buffer[500]; //Red LED sensor data int32_t n_sp02; //SPO2 value int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid int32_t n_heart_rate; //heart rate value int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid uint8_t uch_dummy; int main() { uint32_t un_min, un_max, un_prev_data; //variables to calculate the on-board LED brightness that reflects the heartbeats int i; int32_t n_brightness; float f_temp; sensor.reset(); sensor.init(); n_brightness=0; un_min=0x3FFFF; un_max=0; pc.printf("Start\r\n"); 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++) i=0; while(1) { while(INT.read()==1); //wait until the interrupt pin asserts sensor.read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); //read from MAX30102 FIFO 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 pc.printf("red="); pc.printf("%i", aun_red_buffer[i]); pc.printf(", ir="); pc.printf("%i\n\r", aun_ir_buffer[i]); } 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); //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second 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(INT.read()==1); sensor.read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); 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 pc.printf("red="); pc.printf("%i", aun_red_buffer[i]); pc.printf(", ir="); pc.printf("%i", aun_ir_buffer[i]); pc.printf(", HR=%i, ", n_heart_rate); pc.printf("HRvalid=%i, ", ch_hr_valid); pc.printf("SpO2=%i, ", n_sp02); pc.printf("SPO2Valid=%i\n\r", 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); } //while(1) // display.scroll(":)"); }