MAX44000PMB1 Demonstration

File content as of revision 3:61cc32322303:

/* MAX44000 Ambient Light Sensor / Proximity Sensor Demo
 * This demonstrates some of the capabilities of the MAX44000.
 * 
 * This is written to work with the ARD2PMD adapter board and 
 * the MAX44000PMB1.  It uses the standard Arduino pin names 
 * and it will compile for most arduino form-factor mbed boards.
 *
 * LED1 toggles when something is first detected by the proximity sensor.
 * LED2 indicates when the Ambient Light Sensor reads grater than alsLim.
 * LED3 will stay on whenever something is detected by the proximity sensor 
 *   and stay on for an additional 5s after it is no longer detected.
 *
 * The following boards have been tested to work:
 *   FRDM-KL25Z 
 *   FRDM-K64F
 *   Seeeduino Arch (LEDs inverted)
 *   Seeeduino Arch Pro
 *   ST Nucleo F401RE (only one LED, inverted)
 *  
 * Some boards use D13 for an LED signal, so this example uses the second 
 *   row (row B, pins 7 through 12) of the Pmod connector.  
 */

#include "mbed.h"
#include "MAX14661.h"

MAX14661 mux(D14, D15);
I2C i2c(D14, D15);
DigitalOut tog(LED1);
DigitalOut als(LED2);
DigitalOut dly(LED3);
DigitalIn pb3(D6);  // Set as input to remove load from PB3
DigitalIn pb4(D7);  // Set as input to remove load from PB4

const int alsAddr = 0x94;
const char alsLim = 0x01;

int main()
{
    char cmd[2];

    //  SDA (D14) + PB4 (D7)     SCL (D15) + PB3 (D6)
    mux.setAB((MAX14661::SW10 | MAX14661::SW08),
              (MAX14661::SW09 | MAX14661::SW07));

    cmd[0] = 0x02;  // Receive Register
    cmd[1] = 0xFF;  // 1.56ms, 128x
    i2c.write(alsAddr, cmd, 2);

    cmd[0] = 0x03;  // Transmit Register
    cmd[1] = 0x0F;  // 110mA
    i2c.write(alsAddr, cmd, 2);
    
    cmd[0] = 0x01;  // Config Register
    cmd[1] = 0x10;  // ALS/Prox Mode
    i2c.write(alsAddr, cmd, 2);

    bool lastProx = false;
    int offDelay = 0;
    tog = false;
    als = false;
    dly = false;

    while (true) {
        wait (0.02);
        cmd[0] = 0x04; // ALS Data Register
        i2c.write(alsAddr, cmd, 1);
        i2c.read(alsAddr, cmd, 1);
        als = (cmd[0] < alsLim);

        cmd[0] = 0x16; // Prox Data Register
        i2c.write(alsAddr, cmd, 1);
        i2c.read(alsAddr, cmd, 1);
        if (cmd[0]) {
            if (!lastProx) {
                tog = !tog;
            }
            lastProx = true;
            offDelay = 250;
            dly = false;
        } else {
            lastProx = false;
        }
        if (offDelay > 0) { offDelay -= 1; }
        else { dly = true; }
    }
}