Junichi Katsu
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 
BBC
main.cpp@1:83ace7df2c63, 2018-04-16 (annotated)
- Committer:
- JKsoft_main
- Date:
- Mon Apr 16 16:52:36 2018 +0000
- Revision:
- 1:83ace7df2c63
- Parent:
- 0:0c37474c8541
??
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| JonnyA | 0:0c37474c8541 | 1 | #include "MicroBit.h" |
| JKsoft_main | 1:83ace7df2c63 | 2 | #include "MAX30102.h" |
| JKsoft_main | 1:83ace7df2c63 | 3 | #include "algorithm.h" |
| JKsoft_main | 1:83ace7df2c63 | 4 | |
| JKsoft_main | 1:83ace7df2c63 | 5 | MAX30102 sensor(I2C_SDA0, I2C_SCL0); |
| JonnyA | 0:0c37474c8541 | 6 | |
| JonnyA | 0:0c37474c8541 | 7 | MicroBitDisplay display; |
| JonnyA | 0:0c37474c8541 | 8 | |
| JKsoft_main | 1:83ace7df2c63 | 9 | DigitalIn INT(P0_16); |
| JKsoft_main | 1:83ace7df2c63 | 10 | |
| JKsoft_main | 1:83ace7df2c63 | 11 | Serial pc(USBTX, USBRX); |
| JKsoft_main | 1:83ace7df2c63 | 12 | |
| JKsoft_main | 1:83ace7df2c63 | 13 | #define MAX_BRIGHTNESS 255 |
| JKsoft_main | 1:83ace7df2c63 | 14 | |
| JKsoft_main | 1:83ace7df2c63 | 15 | uint32_t aun_ir_buffer[500]; //IR LED sensor data |
| JKsoft_main | 1:83ace7df2c63 | 16 | int32_t n_ir_buffer_length; //data length |
| JKsoft_main | 1:83ace7df2c63 | 17 | uint32_t aun_red_buffer[500]; //Red LED sensor data |
| JKsoft_main | 1:83ace7df2c63 | 18 | int32_t n_sp02; //SPO2 value |
| JKsoft_main | 1:83ace7df2c63 | 19 | int8_t ch_spo2_valid; //indicator to show if the SP02 calculation is valid |
| JKsoft_main | 1:83ace7df2c63 | 20 | int32_t n_heart_rate; //heart rate value |
| JKsoft_main | 1:83ace7df2c63 | 21 | int8_t ch_hr_valid; //indicator to show if the heart rate calculation is valid |
| JKsoft_main | 1:83ace7df2c63 | 22 | uint8_t uch_dummy; |
| JKsoft_main | 1:83ace7df2c63 | 23 | |
| JonnyA | 0:0c37474c8541 | 24 | int main() |
| JonnyA | 0:0c37474c8541 | 25 | { |
| JKsoft_main | 1:83ace7df2c63 | 26 | uint32_t un_min, un_max, un_prev_data; //variables to calculate the on-board LED brightness that reflects the heartbeats |
| JKsoft_main | 1:83ace7df2c63 | 27 | int i; |
| JKsoft_main | 1:83ace7df2c63 | 28 | int32_t n_brightness; |
| JKsoft_main | 1:83ace7df2c63 | 29 | float f_temp; |
| JKsoft_main | 1:83ace7df2c63 | 30 | |
| JKsoft_main | 1:83ace7df2c63 | 31 | sensor.reset(); |
| JKsoft_main | 1:83ace7df2c63 | 32 | sensor.init(); |
| JKsoft_main | 1:83ace7df2c63 | 33 | |
| JKsoft_main | 1:83ace7df2c63 | 34 | n_brightness=0; |
| JKsoft_main | 1:83ace7df2c63 | 35 | un_min=0x3FFFF; |
| JKsoft_main | 1:83ace7df2c63 | 36 | un_max=0; |
| JKsoft_main | 1:83ace7df2c63 | 37 | |
| JKsoft_main | 1:83ace7df2c63 | 38 | pc.printf("Start\r\n"); |
| JKsoft_main | 1:83ace7df2c63 | 39 | |
| JKsoft_main | 1:83ace7df2c63 | 40 | n_ir_buffer_length=500; //buffer length of 100 stores 5 seconds of samples running at 100sps |
| JKsoft_main | 1:83ace7df2c63 | 41 | |
| JKsoft_main | 1:83ace7df2c63 | 42 | //read the first 500 samples, and determine the signal range |
| JKsoft_main | 1:83ace7df2c63 | 43 | //for(i=0;i<n_ir_buffer_length;i++) |
| JKsoft_main | 1:83ace7df2c63 | 44 | i=0; |
| JonnyA | 0:0c37474c8541 | 45 | while(1) |
| JKsoft_main | 1:83ace7df2c63 | 46 | { |
| JKsoft_main | 1:83ace7df2c63 | 47 | while(INT.read()==1); //wait until the interrupt pin asserts |
| JKsoft_main | 1:83ace7df2c63 | 48 | |
| JKsoft_main | 1:83ace7df2c63 | 49 | sensor.read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); //read from MAX30102 FIFO |
| JKsoft_main | 1:83ace7df2c63 | 50 | |
| JKsoft_main | 1:83ace7df2c63 | 51 | if(un_min>aun_red_buffer[i]) |
| JKsoft_main | 1:83ace7df2c63 | 52 | un_min=aun_red_buffer[i]; //update signal min |
| JKsoft_main | 1:83ace7df2c63 | 53 | if(un_max<aun_red_buffer[i]) |
| JKsoft_main | 1:83ace7df2c63 | 54 | un_max=aun_red_buffer[i]; //update signal max |
| JKsoft_main | 1:83ace7df2c63 | 55 | pc.printf("red="); |
| JKsoft_main | 1:83ace7df2c63 | 56 | pc.printf("%i", aun_red_buffer[i]); |
| JKsoft_main | 1:83ace7df2c63 | 57 | pc.printf(", ir="); |
| JKsoft_main | 1:83ace7df2c63 | 58 | pc.printf("%i\n\r", aun_ir_buffer[i]); |
| JKsoft_main | 1:83ace7df2c63 | 59 | } |
| JKsoft_main | 1:83ace7df2c63 | 60 | un_prev_data=aun_red_buffer[i]; |
| JKsoft_main | 1:83ace7df2c63 | 61 | |
| JKsoft_main | 1:83ace7df2c63 | 62 | |
| JKsoft_main | 1:83ace7df2c63 | 63 | //calculate heart rate and SpO2 after first 500 samples (first 5 seconds of samples) |
| JKsoft_main | 1:83ace7df2c63 | 64 | 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); |
| JKsoft_main | 1:83ace7df2c63 | 65 | |
| JKsoft_main | 1:83ace7df2c63 | 66 | //Continuously taking samples from MAX30102. Heart rate and SpO2 are calculated every 1 second |
| JKsoft_main | 1:83ace7df2c63 | 67 | while(1) |
| JKsoft_main | 1:83ace7df2c63 | 68 | { |
| JKsoft_main | 1:83ace7df2c63 | 69 | i=0; |
| JKsoft_main | 1:83ace7df2c63 | 70 | un_min=0x3FFFF; |
| JKsoft_main | 1:83ace7df2c63 | 71 | un_max=0; |
| JKsoft_main | 1:83ace7df2c63 | 72 | |
| JKsoft_main | 1:83ace7df2c63 | 73 | //dumping the first 100 sets of samples in the memory and shift the last 400 sets of samples to the top |
| JKsoft_main | 1:83ace7df2c63 | 74 | for(i=100;i<500;i++) |
| JKsoft_main | 1:83ace7df2c63 | 75 | { |
| JKsoft_main | 1:83ace7df2c63 | 76 | aun_red_buffer[i-100]=aun_red_buffer[i]; |
| JKsoft_main | 1:83ace7df2c63 | 77 | aun_ir_buffer[i-100]=aun_ir_buffer[i]; |
| JKsoft_main | 1:83ace7df2c63 | 78 | |
| JKsoft_main | 1:83ace7df2c63 | 79 | //update the signal min and max |
| JKsoft_main | 1:83ace7df2c63 | 80 | if(un_min>aun_red_buffer[i]) |
| JKsoft_main | 1:83ace7df2c63 | 81 | un_min=aun_red_buffer[i]; |
| JKsoft_main | 1:83ace7df2c63 | 82 | if(un_max<aun_red_buffer[i]) |
| JKsoft_main | 1:83ace7df2c63 | 83 | un_max=aun_red_buffer[i]; |
| JKsoft_main | 1:83ace7df2c63 | 84 | } |
| JKsoft_main | 1:83ace7df2c63 | 85 | |
| JKsoft_main | 1:83ace7df2c63 | 86 | //take 100 sets of samples before calculating the heart rate. |
| JKsoft_main | 1:83ace7df2c63 | 87 | for(i=400;i<500;i++) |
| JKsoft_main | 1:83ace7df2c63 | 88 | { |
| JKsoft_main | 1:83ace7df2c63 | 89 | un_prev_data=aun_red_buffer[i-1]; |
| JKsoft_main | 1:83ace7df2c63 | 90 | while(INT.read()==1); |
| JKsoft_main | 1:83ace7df2c63 | 91 | sensor.read_fifo((aun_red_buffer+i), (aun_ir_buffer+i)); |
| JKsoft_main | 1:83ace7df2c63 | 92 | |
| JKsoft_main | 1:83ace7df2c63 | 93 | if(aun_red_buffer[i]>un_prev_data) |
| JKsoft_main | 1:83ace7df2c63 | 94 | { |
| JKsoft_main | 1:83ace7df2c63 | 95 | f_temp=aun_red_buffer[i]-un_prev_data; |
| JKsoft_main | 1:83ace7df2c63 | 96 | f_temp/=(un_max-un_min); |
| JKsoft_main | 1:83ace7df2c63 | 97 | f_temp*=MAX_BRIGHTNESS; |
| JKsoft_main | 1:83ace7df2c63 | 98 | n_brightness-=(int)f_temp; |
| JKsoft_main | 1:83ace7df2c63 | 99 | if(n_brightness<0) |
| JKsoft_main | 1:83ace7df2c63 | 100 | n_brightness=0; |
| JKsoft_main | 1:83ace7df2c63 | 101 | } |
| JKsoft_main | 1:83ace7df2c63 | 102 | else |
| JKsoft_main | 1:83ace7df2c63 | 103 | { |
| JKsoft_main | 1:83ace7df2c63 | 104 | f_temp=un_prev_data-aun_red_buffer[i]; |
| JKsoft_main | 1:83ace7df2c63 | 105 | f_temp/=(un_max-un_min); |
| JKsoft_main | 1:83ace7df2c63 | 106 | f_temp*=MAX_BRIGHTNESS; |
| JKsoft_main | 1:83ace7df2c63 | 107 | n_brightness+=(int)f_temp; |
| JKsoft_main | 1:83ace7df2c63 | 108 | if(n_brightness>MAX_BRIGHTNESS) |
| JKsoft_main | 1:83ace7df2c63 | 109 | n_brightness=MAX_BRIGHTNESS; |
| JKsoft_main | 1:83ace7df2c63 | 110 | } |
| JKsoft_main | 1:83ace7df2c63 | 111 | |
| JKsoft_main | 1:83ace7df2c63 | 112 | //send samples and calculation result to terminal program through UART |
| JKsoft_main | 1:83ace7df2c63 | 113 | pc.printf("red="); |
| JKsoft_main | 1:83ace7df2c63 | 114 | pc.printf("%i", aun_red_buffer[i]); |
| JKsoft_main | 1:83ace7df2c63 | 115 | pc.printf(", ir="); |
| JKsoft_main | 1:83ace7df2c63 | 116 | pc.printf("%i", aun_ir_buffer[i]); |
| JKsoft_main | 1:83ace7df2c63 | 117 | pc.printf(", HR=%i, ", n_heart_rate); |
| JKsoft_main | 1:83ace7df2c63 | 118 | pc.printf("HRvalid=%i, ", ch_hr_valid); |
| JKsoft_main | 1:83ace7df2c63 | 119 | pc.printf("SpO2=%i, ", n_sp02); |
| JKsoft_main | 1:83ace7df2c63 | 120 | pc.printf("SPO2Valid=%i\n\r", ch_spo2_valid); |
| JKsoft_main | 1:83ace7df2c63 | 121 | } |
| JKsoft_main | 1:83ace7df2c63 | 122 | 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); |
| JKsoft_main | 1:83ace7df2c63 | 123 | } |
| JKsoft_main | 1:83ace7df2c63 | 124 | |
| JKsoft_main | 1:83ace7df2c63 | 125 | //while(1) |
| JKsoft_main | 1:83ace7df2c63 | 126 | // display.scroll(":)"); |
| JonnyA | 0:0c37474c8541 | 127 | } |