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Original question:

RTOS/TMDXICE110: ADC usage

RTOS/TMDXICE110: ADC example project

Giulio de Vito
Prodigy 120 points
Part Number: TMDXICE110
Other Parts Discussed in Thread: AMIC110

Tool/software: TI-RTOS

Hi,

is there any pre-compiled project related to ADC (analog input reading) for the TI Sitara family?

I use an ICE AMIC110 board and I need to test the input DC potential on bare metal with ADC, I would like to start with an easy example if possible.

thanks,

Giulio

  • 0
    TI__Guru* 95265 points

    Hi,

    The Processor SDK RTOS for AM335x/AMIC110 doesn't support ADC driver. There are some ADC examples available under  pdk_am335x_1_0_xx\packages\ti\starterware\examples\adc\volt_measure you can study. Also, there are ADC diagnostics under pdk_am335x_1_0_xx\packages\ti\board\diag\adc for particular AM335x platforms. You can refer to the test code and port to the AMIC110.

    Regards, Eric

  • 0 in reply to lding
    Prodigy 120 points

    Hi Eric,

    thanks for the replay, I managed to build a project with the pdk_am335x_1_0_xx\packages\ti\board\diag\adc example but I read the wrong values.

    I configured the first two steps with SW_ENABLED_CONTINUOUS mode (software continuous mode) and MODE_FOUR_WIRE.

    Without changing the pins_muxing, I leaved the pins ADC0 and ADC1 floating thus I should read a value close to zero.

    The problem is that in this configuration I get the channel AN0 with 0 mV and AN1 with ~1789 mV.

    I think it can be that the pins were not configured properly and maybe read from the configuration of the AM335x.

    Do you have any suggestion?

    Regards, Giulio

  • 0 in reply to Giulio de Vito
    Prodigy 120 points

    Hi,

    we have figured out that on ice AMIC110 there are missing the bridges resistances that connect with the physical pins, thus  it  is not possible to make measurements.

    thanks