Personal Hearing Safety Canary

#include "mbed.h"
#include "MAX77650.h"

PwmOut redLed(LED_RED);
PwmOut grnLed(LED_GREEN);
PwmOut bluLed(LED_BLUE);


#define HAS_VIBRATION
#define DEBUG

#define CALIB_MAX 3000


#ifdef HAS_VIBRATION
PwmOut vibrationMotor(P1_5);
#endif

#ifdef DEBUG
Serial pc(USBTX, USBRX); // tx, rx
#endif

// I2C master 2
I2C i2c2(I2C2_SDA, I2C2_SCL);

// MAX77650 PMIC and Charger
MAX77650 max77650(i2c2);

// mosi/miso/sclk/ssel
SPI spi(P1_1, P1_2, P1_0);
DigitalOut cs(P1_3);

int stateOfCharge;
float longAvg = 0.0;
float medAvg = 0.0;
float shortAvg = 0.0;
long runsOk = 0;
long cycles = 0;
Timer lastVibration;

void updateLeds() {
    if (longAvg > CALIB_MAX) {
        if (lastVibration.read() > 60*5) { // 5 mins
          vibrationMotor.write(0.4f);
          wait(0.5);
          vibrationMotor.write(0.9f);
          wait(0.3);
          vibrationMotor.write(0.0f);
          lastVibration.reset();
        }
        redLed = 1;
    } else {
        redLed = 0;
    }
}

// PMic Led Data
static char ledData[] = {
    MAX77650::CNFG_LED0_A,
    0x04, 0x04, 0x44,
    0x0F, 0x0F, 0x0F,
    0x01,
};

// main() runs in its own thread in the OS
int main() {
    //pc.baud(19200);
    // Turn off Low-Dropout Linear Regulator (LDO); unused on MAX32620FTHR platform
    max77650.disableLDO();
    
    lastVibration.start();
    vibrationMotor.write(0.0f);
    
    // Set SIMO Buck-Boost Regulator 2 target voltage; provides VDDIOH
    max77650.setSBB2Voltage(3.3f);
    
    // Chip must be deselected
    cs = 1;
 
    // Setup the spi for 8 bit data, high steady state clock,
    // second edge capture, with a 1MHz clock rate
    spi.format(8,3);
    spi.frequency(2000000);
 
    // Select the device by seting chip select low
    cs = 0;
    
    max77650.writeReg(ledData, sizeof(ledData));
    
    
    while (true) {
        cs = 0;
        /* Combine bytes into the single package */
        uint16_t package = ((spi.write(0) << 8) | spi.write(0)); 
        package &= 0x0fff;
        
        shortAvg = shortAvg * 0.5 + package * 0.5;
        
        if (cycles % 5) {
            medAvg = medAvg * 0.7 + shortAvg * 0.3;
        }
        if (cycles % 10) {
            longAvg = longAvg * 0.9 + medAvg * 0.1;
            bluLed.write(medAvg / 4000);
        }
        
        if (runsOk < 1000000) {
            runsOk += 1;
            if (cycles % 10000) {
                redLed = !redLed;
            }
        } else {
            if (cycles % 10) {
                updateLeds();
            }
        }
        
        if (cycles % 100000) {
            max17055.reportSOC(&stateOfCharge);
            if (stateOfCharge < 51.0) {
                ledData[0] = 0x44;
            } else {
                ledData[0] = 0x04;
            }
            max77650.writeReg(ledData, sizeof(ledData));
        }
        
        if (cycles % 1000) {
            // actual data out from mic
#ifdef DEBUG
            pc.printf("d:%d,am:%f,al:%f\n", package, medAvg, longAvg);
#endif

            grnLed.write(medAvg / 4000);
        }
        cycles++;
      
        /* close the SPI conversation correctly */
        cs = 1;
    }
}