Reading and transmitting accelerometer values

Support Wixel
90

It just occurred to me that there’s no reason I need to convert the raw ADC values to millivolts for my application. I wanted to test how accurate the ADC values were using the internal 1.25 V reference, but after adding the ADC_REFERNCE_INTERNAL parameter to adcRead, the values hardly changed from “2047” while rotating the accelerometer.
here’s the code:

/*
 * This program outputs the raw ADC accelerometer values on P0_5.
 *
 */
#include <wixel.h>
#include <time.h>
#include <usb.h>
#include <usb_com.h>
#include <adc.h>
#include <stdio.h>

uint32 lastToggle = 0;

void analogInputsInit() {
 //Disable pull-ups and pull-downs for all pins on Port 0.
		P0INP = 0x3F;

}

void putchar(char c)
{
    usbComTxSendByte(c);
}


void updateprint()
{

    if (getMs() - lastToggle >= 1000)
    {
    	if (usbComTxAvailable() >= 64)
    	        {

    	            printf("adc: %d\r\n",  adcRead(5 | ADC_REFERENCE_INTERNAL));
    	        }
        lastToggle = getMs();
    }
}


void main()
{
    systemInit();
    usbInit();
    analogInputsInit();

    while(1)
    {
        boardService();
        updateprint();
        usbComService();

        usbShowStatusWithGreenLed();
        LED_RED(1);
    }
}

Is there something about the ADC_REFERENCE_INTERNAL parameter I’m missing?