File content as of revision 11:7a7913d47ca6:

#include "mbed.h"
#include "Si7021.h"

// I2C Definition
I2C spd800_i2c(PB_9, PB_8); //sda, scl

DigitalOut si7021_power_pin(PB_2);

Serial pc(SERIAL_TX, SERIAL_RX,115200);

void print_array(char *array, int len) {
    for (int idx = 0; idx < len; idx++) {
         pc.printf("%x", array[idx]);
    } 
    pc.printf("\r\n");
}

float read_pressure_measurement() {
    char output[9];
    
    // Read measurements
    if ( spd800_i2c.read((0x25 << 1), output, 9) != 0 ) { // read from register
        pc.printf("FAILED TO READ PRESSURE: %d\r\n", spd800_i2c.read((0x25 << 1), output, 9));
    }
    //print_array(output, 9);
    
    // Interpret
    int16_t diffPressureTicks = (output[0] << 8) | output[1];
    // int16_t temperatureTicks = (output[3] << 8) | output[4];
    uint16_t scaleFactorDiffPressure = (output[6] << 8) | output[7];
    
    float diffPressure = (float)diffPressureTicks / (float)scaleFactorDiffPressure;
    
    return diffPressure;
}

int main() {
    pc.printf("Starting Pressure/Temp/Humidity Sensor Test..\r\n");
    
    wait(3);
    
    char cont_measure_command[2] = {0x36, 0x1E};
    char single_measure_command[2] = {0x36, 0x2F}; 
    char stop_command[2] = {0x3F, 0xF9};
    char reset_command[1] = {0x06};
    
    // Reset the pressure sensor
    pc.printf("Resetting Pressure Sensor...\r\n");
    if ( spd800_i2c.write(0x00, reset_command, 1) != 0 ) {
        pc.printf("RESET FAILED!\r\n");        
    }
    
    // set up SHT31
    si7021_power_pin = 1;
    Si7021 si7021 = Si7021(PB_9, PB_8);
    
    wait(1);
    
    
    // Take a few manual measurements
    while( true ) {
        pc.printf("\r\n\n");
        pc.printf("Measuring Pressure...\r\n");
        if ( spd800_i2c.write((0x25 << 1), single_measure_command, 2) != 0 ) {
            pc.printf("FAILED TO WRITE TO PRESSURE SENSOR\r\n");
        }
        wait(1);
        pc.printf("Measuring Temp/Humidity...\r\n");
        if ( !si7021.check() ) {
            pc.printf("TEMP/HUMIDITY SENSOR NOT WORKING\r\n");
        } else {
            si7021.measure();
        }
        pc.printf("Humidity: %d\r\n", si7021.get_humidity());
        pc.printf("Temperature: %d\r\n", si7021.get_temperature());
        pc.printf("Pressure: %f\r\n", read_pressure_measurement());
        wait(1);

    }
    
    
    
    
    /*// Start Pressure Measurements
    pc.printf("Starting Measurements...\r\n");
    if ( i2c.write((0x25 << 1), cont_measure_command, 2) != 0 ) {
         pc.printf("START COMMAND FAILED!\r\n");
    }
    wait(1);
    
    while( true ) {
         pc.printf("%f\r\n", read_measurement());  
        wait(1);
    }*/
    
      
}