Xi Han / Mbed OS HeartRate

UCLA CSM119 "How to Approach New Hardware Demo"

Dependencies:   MAX30101

main.cpp@3:2e12e0cd1f26, 2018-06-01 (annotated)

Committer:
xihan94
Date:
Fri Jun 01 23:23:08 2018 +0000
Revision:
3:2e12e0cd1f26
Parent:
1:ad1b075585bc 
Update

Who changed what in which revision?

UserRevisionLine numberNew contents of line
xihan94 0:33686dd26bf9 1 #include "mbed.h"
xihan94 0:33686dd26bf9 2 #include "mbed_events.h"
xihan94 0:33686dd26bf9 3 #include "MAX30101.h"
xihan94 0:33686dd26bf9 4
xihan94 0:33686dd26bf9 5 #define FIFO_DATA_MAX 288
xihan94 0:33686dd26bf9 6
xihan94 0:33686dd26bf9 7 DigitalOut pwr1v8(PTA29);
xihan94 1:ad1b075585bc 8 DigitalOut pwr3v3b(PTC13);
xihan94 1:ad1b075585bc 9 DigitalOut pwr15v(PTB12);
xihan94 0:33686dd26bf9 10 I2C i2c0(PTB1, PTB0);
xihan94 0:33686dd26bf9 11 InterruptIn maximInterrupt(PTB18);
xihan94 0:33686dd26bf9 12 Serial pc(USBTX, USBRX);
xihan94 0:33686dd26bf9 13
xihan94 0:33686dd26bf9 14 EventQueue evqueue(32 * EVENTS_EVENT_SIZE);
xihan94 0:33686dd26bf9 15 Thread t;
xihan94 0:33686dd26bf9 16
xihan94 0:33686dd26bf9 17 MAX30101 hr(i2c0);
xihan94 0:33686dd26bf9 18
xihan94 1:ad1b075585bc 19 int mask_ppg = 0;
xihan94 1:ad1b075585bc 20 uint32_t count = 0;
xihan94 0:33686dd26bf9 21 void interruptHandlerQueued() {
xihan94 0:33686dd26bf9 22
xihan94 0:33686dd26bf9 23 MAX30101::InterruptBitField_u interruptStatus;
xihan94 0:33686dd26bf9 24 hr.getInterruptStatus(interruptStatus);
xihan94 3:2e12e0cd1f26 25 // printf("Interrupt Status: 0x%02x\r\n", interruptStatus.all);
xihan94 0:33686dd26bf9 26
xihan94 0:33686dd26bf9 27 if (interruptStatus.bits.pwr_rdy == 0x1) {
xihan94 3:2e12e0cd1f26 28 // printf("Powered on\r\n");
xihan94 0:33686dd26bf9 29
xihan94 1:ad1b075585bc 30 // Soft reset
xihan94 1:ad1b075585bc 31 MAX30101::ModeConfiguration_u modeConf;
xihan94 1:ad1b075585bc 32 modeConf.all = 0;
xihan94 1:ad1b075585bc 33 modeConf.bits.reset = 1;
xihan94 1:ad1b075585bc 34 hr.setModeConfiguration(modeConf);
xihan94 1:ad1b075585bc 35 wait(0.01);
xihan94 1:ad1b075585bc 36
xihan94 0:33686dd26bf9 37 // Configure FIFO
xihan94 0:33686dd26bf9 38 MAX30101::FIFO_Configuration_u fifoConf;
xihan94 0:33686dd26bf9 39 hr.getFIFOConfiguration(fifoConf);
xihan94 3:2e12e0cd1f26 40 // pc.printf("FIFO Configuration: 0x%02x\r\n", fifoConf.all);
xihan94 0:33686dd26bf9 41
xihan94 0:33686dd26bf9 42 // Set LED power
xihan94 1:ad1b075585bc 43 hr.setLEDPulseAmplitude(MAX30101::LED1_PA, 0x0C);
xihan94 1:ad1b075585bc 44 hr.setLEDPulseAmplitude(MAX30101::ProxModeLED_PA, 0x19);
xihan94 3:2e12e0cd1f26 45 // pc.printf("LED set\r\n");
xihan94 0:33686dd26bf9 46
xihan94 0:33686dd26bf9 47 MAX30101::SpO2Configuration_u spo2Conf;
xihan94 0:33686dd26bf9 48 hr.getSpO2Configuration(spo2Conf);
xihan94 1:ad1b075585bc 49 spo2Conf.bits.led_pw = MAX30101::PW_1;
xihan94 1:ad1b075585bc 50 spo2Conf.bits.spo2_sr = MAX30101::SR_100_Hz;
xihan94 1:ad1b075585bc 51 hr.setSpO2Configuration(spo2Conf);
xihan94 1:ad1b075585bc 52 hr.getSpO2Configuration(spo2Conf);
xihan94 3:2e12e0cd1f26 53 // pc.printf("SpO2 Configuration: 0x%02x\r\n", spo2Conf.all);
xihan94 0:33686dd26bf9 54
xihan94 1:ad1b075585bc 55 // Proximity settings
xihan94 1:ad1b075585bc 56 hr.setProxIntThreshold(0x14);
xihan94 1:ad1b075585bc 57
xihan94 0:33686dd26bf9 58 // Enable HR mode
xihan94 0:33686dd26bf9 59 modeConf.all = 0;
xihan94 0:33686dd26bf9 60 modeConf.bits.mode = MAX30101::HeartRateMode;
xihan94 0:33686dd26bf9 61 hr.setModeConfiguration(modeConf);
xihan94 3:2e12e0cd1f26 62 // printf("Mode set\r\n");
xihan94 0:33686dd26bf9 63 }
xihan94 0:33686dd26bf9 64
xihan94 1:ad1b075585bc 65 if (interruptStatus.bits.prox_int == 0x1) {
xihan94 3:2e12e0cd1f26 66 // printf("Proximity Triggered, entered HR Mode.");
xihan94 1:ad1b075585bc 67 }
xihan94 1:ad1b075585bc 68
xihan94 0:33686dd26bf9 69 if (interruptStatus.bits.ppg_rdy == 0x1) {
xihan94 3:2e12e0cd1f26 70 // printf("PPG Ready.\r\n");
xihan94 1:ad1b075585bc 71 mask_ppg = 1;
xihan94 0:33686dd26bf9 72 }
xihan94 0:33686dd26bf9 73
xihan94 0:33686dd26bf9 74 if (interruptStatus.bits.a_full == 0x1) {
xihan94 3:2e12e0cd1f26 75 // printf("FIFO Almost Full.\r\n");
xihan94 1:ad1b075585bc 76 uint8_t data[FIFO_DATA_MAX];
xihan94 1:ad1b075585bc 77 uint16_t readBytes = 0;
xihan94 1:ad1b075585bc 78 hr.readFIFO(MAX30101::OneLedChannel, data, readBytes);
xihan94 1:ad1b075585bc 79
xihan94 1:ad1b075585bc 80 for (uint16_t i = 0; i < readBytes; i += 3) {
xihan94 1:ad1b075585bc 81 uint8_t sample[4] = {0};
xihan94 1:ad1b075585bc 82 sample[0] = data[i + 2];
xihan94 1:ad1b075585bc 83 sample[1] = data[i + 1];
xihan94 1:ad1b075585bc 84 sample[2] = data[i];
xihan94 1:ad1b075585bc 85
xihan94 1:ad1b075585bc 86 printf("%u\r\n", *(uint32_t *) sample);
xihan94 1:ad1b075585bc 87 }
xihan94 0:33686dd26bf9 88 }
xihan94 0:33686dd26bf9 89
xihan94 0:33686dd26bf9 90 interruptStatus.all = 0xFF;
xihan94 1:ad1b075585bc 91 if (mask_ppg == 1) {
xihan94 1:ad1b075585bc 92 interruptStatus.bits.ppg_rdy = 0;
xihan94 1:ad1b075585bc 93 }
xihan94 0:33686dd26bf9 94 hr.enableInterrupts(interruptStatus);
xihan94 0:33686dd26bf9 95 }
xihan94 0:33686dd26bf9 96
xihan94 0:33686dd26bf9 97 void interruptHandler() {
xihan94 0:33686dd26bf9 98 evqueue.call(interruptHandlerQueued);
xihan94 0:33686dd26bf9 99 }
xihan94 0:33686dd26bf9 100
xihan94 0:33686dd26bf9 101 // main() runs in its own thread in the OS
xihan94 0:33686dd26bf9 102 int main() {
xihan94 3:2e12e0cd1f26 103 // printf("Hello world.\r\n");
xihan94 0:33686dd26bf9 104
xihan94 0:33686dd26bf9 105 t.start(callback(&evqueue, &EventQueue::dispatch_forever));
xihan94 0:33686dd26bf9 106
xihan94 0:33686dd26bf9 107 pwr1v8 = 1;
xihan94 0:33686dd26bf9 108 pwr3v3b = 1;
xihan94 1:ad1b075585bc 109 pwr15v = 0;
xihan94 0:33686dd26bf9 110
xihan94 0:33686dd26bf9 111 maximInterrupt.fall(interruptHandler);
xihan94 0:33686dd26bf9 112 maximInterrupt.enable_irq();
xihan94 0:33686dd26bf9 113
xihan94 0:33686dd26bf9 114 MAX30101::InterruptBitField_u interruptStatus;
xihan94 0:33686dd26bf9 115 interruptStatus.all = 0xFF;
xihan94 0:33686dd26bf9 116 hr.enableInterrupts(interruptStatus);
xihan94 0:33686dd26bf9 117
xihan94 0:33686dd26bf9 118 return 0;
xihan94 0:33686dd26bf9 119 }
xihan94 0:33686dd26bf9 120