TMS320F280049C: ADC example not working for 56RSH package

Hi Wali,

Please check the channels are externally connected to 3.3V to get reading of 4096.

Please double check if you are using internal or external Vref for ADC..If external, need to apply some voltage .

Thanks,
Susmitha

Hi Bumadi,

Thank you for your response

internal vref of 2.5v is used

input pin is connected with 1v

Regards,

Vijayaraj

Can you please try inputting 3.3V on ADC channel?

Thanks,
Susmitha

Hi, 

     When we read first time, the values as expected. refresh and read second time using debugger the value is going to 0 or 4095. somehow the values are saturating. same code we tried for 100pin evaluation board, there it is working good. 

    can you please help where to look on this is may related to compiler or api. 

Regards

Karunakaran

Hi Karunakaran,

Did you try running on different ADC module? It might be good to rule out the possibility of damage for just single module or entire ADC.

I can review the schematics, if you need help with that.

Thanks,
Susmitha

Hi Susmitha

   I tried with different ADC A, B, C and different boards. Directly giving ADC input 1V from power source.

Regards 

Karunakaran 

Hi Karunakaran,

Sorry for the delay.

Sysconfig doesn't support this package. It only supports 100 pins. So Please use ADC init for all the ADC configuration

A0 A1 A2 are on this 56RSH package, but A3 is not there. You can either delete that or replace A3 with A4 in the code.

Thanks,
Susmitha