File content as of revision 6:8f16c432964d:

#include "mbed.h"

#define M_PI 3.14159265358979323846

#define N_SAMPLES 1024

//mbed class def
Serial pc(USBTX, USBRX); // tx, rx
SPI spi(p5, p6, p7); // mosi, miso, sclk
DigitalOut cs(p8);

PwmOut motorOn(p26);

Timer t;

//variable instaniation
unsigned short calData[6];

char buffer16[3];
short int serbuffer[2];

char tempBuffer[4];
unsigned int temp = 0;
char pressBuffer[4];
unsigned int press = 0;

unsigned int pData[N_SAMPLES];
float spData[N_SAMPLES];
unsigned int tData[N_SAMPLES];

const char cb1 = 0xA2;
const char cb2 = 0xA4;
const char cb3 = 0xA6;
const char cb4 = 0xA8;
const char cb5 = 0xAA;
const char cb6 = 0xAC;

const char * commarr[6] = {&cb1, &cb2, &cb3, &cb4, &cb5, &cb6};

const char D1conv256 = 0x40;
const char D1conv512 = 0x42;
const char D2conv4096 = 0x58;
const char D2conv512 = 0x52;
const char readADC = 0x00;

float duty = 1;

int round(float number)
{
    return (number >= 0) ? (int)(number + 0.5) : (int)(number - 0.5);
}

//calculate temperature
int calcT(unsigned int Tval, unsigned short consts[6])
{
    int dT = Tval - consts[4]*(2<<7);

    int T = 2000 + dT*consts[5]/(2<<22);
    printf("Temp: %d C\n", T);
    return T;
}

//calculate 1st order temperature compensated pressure
int calcP(unsigned int Tval, unsigned int Pval, unsigned short consts[6])
{
    int dT = Tval - consts[4]*(2<<7);

    long long int off = (long long)consts[1]*(2<<16) + ((long long)consts[3] *(long long)dT)/(2<<5);

    long long int sens = (long long)consts[0]*(2<<15) + ((long long)consts[2] *(long long)dT)/(2<<6);

    int P = (Pval *(sens/(2<<20)) - off)/(2<<14);
    //printf("Pressure %d Pa\n\r", P);
    return P;
}

int main()
{
    pc.baud(115200);
    motorOn = 0;
    motorOn.period_ms(10);

    printf("Turrentine\n");

    // 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(500000);
    spi.set_default_write_value(0x00);

    // Select the device by seting chip select low
    cs = 0;

    // Send 0x1E Command to reset the chip
    spi.write(0x1E);
    cs = 1;
    wait_ms(100);
    cs = 1;

    printf("Read cal data\n");

    //read cal data values from device into program
    for (char i=0; i<6; i++) {
        //spi read sequence
        cs= 0;
        spi.write(commarr[i], 1, buffer16, 3);
        //time for SPI to write into data buffers
        wait_ms(10);
        cs=1;
        //Put data into 16bit unsigned int in calData array
        calData[i] = buffer16[1]<<8 | buffer16[2];
    }


    printf("Pump On\n");

    //turn pump on
    motorOn.write(duty);


    //dummy samples to wait for sensor response to stabilise
    int a =0;
    while(a < 10000) {
        cs = 0;
        spi.write(&D1conv256, 1, buffer16, 1);
        wait_us(500);
        cs = 1;
        cs = 0;
        spi.write(&readADC, 1, pressBuffer, 4);
        cs = 1;
        a++;
    }

    printf("Start loop\n");

    //program loop
    while(1) {
        
        //read temerature value
        cs = 0;
        spi.write(&D2conv4096, 1, buffer16, 1);
        wait_ms(10);
        cs = 1;
        cs = 0;
        spi.write(&readADC, 1, tempBuffer, 4);
        cs = 1;

        //write values from buffers to program variables
        temp = tempBuffer[1]<<16 | tempBuffer[2]<<8 | tempBuffer[3];
        

        int a =0;
        while(a < 5000) {
            cs = 0;
            spi.write(&D1conv256, 1, buffer16, 1);
            wait_us(500);
            cs = 1;
            cs = 0;
            spi.write(&readADC, 1, pressBuffer, 4);
            cs = 1;
            a++;
        }

        printf("Start Measurement\n");
        
        t.reset();
        t.start();
        
        //loop values
        for (int x = 0; x < N_SAMPLES; x++) {
            cs = 0;
            spi.write(&D1conv256, 1, buffer16, 1);
            wait_us(500);
            cs = 1;

            cs = 0;
            if (x > 0) {
                pData[x-1] = pressBuffer[1]<<16 | pressBuffer[2]<<8 | pressBuffer[3];
                
            }
            spi.write(&readADC, 1, pressBuffer, 4);
            tData[x] = t.read_us();
            cs = 1;
        }

        pData[N_SAMPLES - 1] = pressBuffer[1]<<16 | pressBuffer[2]<<8 | pressBuffer[3];

        //stop timer
        t.stop();

        printf("Stop Measurement\n");

        //calc temperature
        calcT(temp, calData);
        long long sum = 0;


        //output data to PC
        printf("$CAL %hu %hu %hu %hu %hu %hu\n", calData[0], calData[1], calData[2], calData[3], calData[4], calData[5]);

        for(int i = 0; i < N_SAMPLES; i++) {
            printf("$%d\n", pData[i]);
        }

        printf("$COMPLETE\n");

        
    }
}