You did not change ADC10CTL1 (part of that register, INCHx, selects
the channel), thus it retains its Power-On-Reset value of ox0000.
This means channel 0 is selected.
--- In m..., "cvrider" wrote:
>
> I am trying to create code to continuously make a single sample of a
> couple ADC channels and send it over an RF link to the access point.
> I am working off the sample that comes with the eZ430-2500RF dev
> kit. I would like to sample A0 and A1. However, my code seems to
> capture the same value for both A0 and A1 as if it is not correctly
> sampling A1. My code is here:
>
> ADC10CTL0 = ADC10SHT_3 + ADC10ON + ADC10IE; // ADC10ON, interrupt
> enabled
> ADC10AE0 |= 0x01; // P2.0 ADC option select
>
> ADC10CTL0 |= ENC + ADC10SC; // Sampling and
> conversion start
> __bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will
> force exit
> ADC10CTL0 &= ~ENC;
>
> adc[0] = ADC10MEM;
> msg[0] = adc[0]&0xFF;
> msg[1] = (adc[0]>>8)&0xFF;
>
>
> ADC10CTL0 = ADC10SHT_3 + ADC10ON + ADC10IE; // ADC10ON,
> interrupt enabled
> ADC10AE0 |= 0x04; // P2.1 ADC option
> select
>
> ADC10CTL0 |= ENC + ADC10SC; // Sampling and
> conversion start
> __bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will
> force exit
>
> ADC10CTL0 &= ~ENC;
>
> ADC10CTL0 &= ~(REFON + ADC10ON); // turn off A/D to save
> power
>
> adc[1] = ADC10MEM;
> msg[2] = adc[1]&0xFF;
> msg[3] = (adc[1]>>8)&0xFF;
>
> From what I have read, I would think I need to use ADC10CTL1 and set
> INCH to the proper channel. However, I never set this for A0 and it
> seems to sample correctly. I just cannot sample any other channels.
> What am I doing wrong? Is there a better way to do this?
>
> Thanks,
> Mark
>
