Bluetooth Heart Rate Monitor using Maxim MAX32630FTHR & MAXREFDES117
Fork of mbed-os-example-ble-HeartRate by
Revision 49:5be03f287022, committed 2017-12-11
- Comitter:
- Brakkion
- Date:
- Mon Dec 11 16:22:50 2017 +0000
- Parent:
- 47:8ae30057edc0
- Commit message:
- Created using MAX32630FTHR & MAXREFDES117
Changed in this revision
MAX30102/MAX30102.cpp | Show annotated file Show diff for this revision Revisions of this file |
source/main.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r 8ae30057edc0 -r 5be03f287022 MAX30102/MAX30102.cpp --- a/MAX30102/MAX30102.cpp Tue Dec 05 20:11:10 2017 +0000 +++ b/MAX30102/MAX30102.cpp Mon Dec 11 16:22:50 2017 +0000 @@ -61,6 +61,7 @@ #ifdef TARGET_MAX32630FTHR I2C i2c(P3_4, P3_5); // SDA, SCL +//I2C i2c(I2C1_SDA, I2C1_SCL); #else I2C i2c(I2C_SDA, I2C_SCL); #endif
diff -r 8ae30057edc0 -r 5be03f287022 source/main.cpp --- a/source/main.cpp Tue Dec 05 20:11:10 2017 +0000 +++ b/source/main.cpp Mon Dec 11 16:22:50 2017 +0000 @@ -36,8 +36,13 @@ 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; +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; +uint8_t hrmCounter; -Serial pc(USBTX, USBRX); //initializes the serial port + #ifdef TARGET_MAX32630FTHR PwmOut led1(LED_RED); //initializes the pwm output that connects to the on board LED DigitalIn INT(P3_0); //pin P30 connects to the interrupt output pin of the MAX30102 @@ -46,8 +51,6 @@ const static char DEVICE_NAME[] = "HRM"; static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE}; -static uint8_t hrmCounter = 100; // init HRM to 100bps -//static uint8_t hrmCounter = n_heart_rate; static HeartRateService *hrServicePtr; static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE); @@ -57,28 +60,81 @@ BLE::Instance().gap().startAdvertising(); // restart advertising } +void checkHR(){ + + 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); + maxim_max30102_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; + } +#if defined(TARGET_KL25Z) || defined(TARGET_MAX32630FTHR) + led1.write(1-(float)n_brightness/256); +#endif + + + } + 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); +} + void updateSensorValue() { // Do blocking calls or whatever is necessary for sensor polling. // In our case, we simply update the HRM measurement. - hrmCounter++; - - // 100 <= HRM bps <=175 - if (hrmCounter == 175) { - hrmCounter = 100; - } + + checkHR(); + + hrmCounter = n_heart_rate; + hrServicePtr->updateHeartRate(hrmCounter); } void periodicCallback(void) { - led2 = !led2; /* Do blinky on LED2 while we're waiting for BLE events */ if (BLE::Instance().getGapState().connected) { eventQueue.call(updateSensorValue); } } + + void onBleInitError(BLE &ble, ble_error_t error) { (void)ble; @@ -137,22 +193,6 @@ int main() { - - //eventQueue.call_every(500, periodicCallback); - - //BLE &ble = BLE::Instance(); - //ble.onEventsToProcess(scheduleBleEventsProcessing); - //ble.init(bleInitComplete); - - //eventQueue.dispatch_forever(); - - 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; - - - maxim_max30102_reset(); //resets the MAX30102 @@ -160,8 +200,6 @@ maxim_max30102_read_reg(0,&uch_dummy); - //uch_dummy=getchar(); - maxim_max30102_init(); //initializes the MAX30102 n_brightness=0; @@ -189,71 +227,17 @@ 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) { eventQueue.call_every(500, periodicCallback); - //BLE &ble = BLE::Instance(); - //ble.onEventsToProcess(scheduleBleEventsProcessing); - //ble.init(bleInitComplete); - - 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); - maxim_max30102_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; - } -#if defined(TARGET_KL25Z) || defined(TARGET_MAX32630FTHR) - led1.write(1-(float)n_brightness/256); -#endif - - - } - 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); - BLE &ble = BLE::Instance(); ble.onEventsToProcess(scheduleBleEventsProcessing); ble.init(bleInitComplete); eventQueue.dispatch_forever(); + + } }