File content as of revision 1:cd2525cbbe4e:

#include "mbed.h"
#include "FXOS8700CQ.h"

#define DATA_RECORD_TIME_MS 1000

Serial pc(USBTX, USBRX); // Primary output to demonstrate library

// Pin names for FRDM-K64F
FXOS8700CQ fxos(PTE25, PTE24, FXOS8700CQ_SLAVE_ADDR1); // SDA, SCL, (addr << 1)

DigitalOut green(LED_GREEN); // waiting light
DigitalOut blue(LED_BLUE); // collection-in-progress light
DigitalOut red(LED_RED); // completed/error ligt

Timer t; // Microsecond timer, 32 bit int, maximum count of ~30 minutes
InterruptIn fxos_int1(PTC6); // unused, common with SW2 on FRDM-K64F
InterruptIn fxos_int2(PTC13); // should just be the Data-Ready interrupt
InterruptIn start_sw(PTA4); // switch SW3

// Interrupt status flags and data
bool fxos_int1_triggered = false;
bool fxos_int2_triggered = false;
uint32_t us_ellapsed = 0;
bool start_sw_triggered = false;

void trigger_fxos_int1(void)
{
    fxos_int1_triggered = true;
}

void trigger_fxos_int2(void)
{
    fxos_int2_triggered = true;
    us_ellapsed = t.read_us();
}

void trigger_start_sw(void)
{
    start_sw_triggered = true;
}

void print_reading()
{
    pc.printf("%d A X:%5d,Y:%5d,Z:%5d   M X:%5d,Y:%5d,Z:%5d\r\n",
              us_ellapsed,
              fxos.getAccelX(), fxos.getAccelY(), fxos.getAccelZ(),
              fxos.getMagnetX(), fxos.getMagnetY(), fxos.getMagnetZ());
}

int main(void)
{
    // Setup
    t.reset();
    pc.baud(115200); // Print quickly! 200Hz x line of output data!

    // Lights off (FRDM-K64F has active-low LEDs)
    green.write(1);
    red.write(1);
    blue.write(1);

    // Diagnostic printing of the FXOS WHOAMI register value
    printf("\r\n\nFXOS8700Q Who Am I= %X\r\n", fxos.get_whoami());

    // Iterrupt for active-low interrupt line from FXOS
    // Configured with only one interrupt on INT2 signaling Data-Ready
    fxos_int2.fall(&trigger_fxos_int2);
    fxos.enable();

    // Interrupt for SW3 button-down state
    start_sw.mode(PullUp); // Since the FRDM-K64F doesn't have its SW2/SW3 pull-ups populated
    start_sw.fall(&trigger_start_sw);

    green.write(0); // ready-green on

    // Example data printing
    fxos.get_data();
    print_reading();

    pc.printf("Waiting for data collection trigger on SW3\r\n");

    while(true) {
        if(start_sw_triggered) {
            break;
        }
        wait_ms(50); // just to slow the loop, fast enough for UX
    }

    green.write(1); // ready-green off
    blue.write(0); // working-blue on

   pc.printf("Started data collection. Accelerometer at max %dg.\r\n",
   fxos.get_accel_scale());

    fxos.get_data(); // clear interrupt from device
    fxos_int2_triggered = false; // un-trigger

    t.start(); // start timer and enter collection loop
    while (t.read_ms() <= DATA_RECORD_TIME_MS) {

        if(fxos_int2_triggered) {
            fxos_int2_triggered = false; // un-trigger
            fxos.get_data();
            print_reading(); // outpouring of data !!
        }

        // Continuous polling of interrupt status is not efficient, but...
        wait_us(500); // 1/10th the period of the 200Hz sample rate
    }

    blue.write(1); // working-blue off
    red.write(0); // complete-red on

    pc.printf("Done. Reset to repeat.\r\n");

    while(true) {
        pc.putc('.'); // idle dots
        wait(1.0);
    }
}