AM2634: ADC0 Channel AIN0 not working

Baljeet Bhatti

Part Number: AM2634
Other Parts Discussed in Thread: TMDSCNCD263

Hi,

I am using TMDSCNCD263 eval board and trying to read ADC0 AIN0 but it is not working. I have checked the voltage at the pin, it about 10mv but the digital reading is always above 2400, what is wring.

ADC settings are:

.base = CSL_CONTROLSS_ADC0_U_BASE,
.clkPrescale = ADC_CLK_DIV_4_0,
.resolution = ADC_RESOLUTION_12BIT,
.signalMode = ADC_MODE_SINGLE_ENDED,
.priMode = ADC_PRI_ALL_ROUND_ROBIN,
.burstTrigger = ADC_TRIGGER_SW_ONLY,
.burstSize = 1,
.socNumber = ADC_SOC_NUMBER0,
.trigger = ADC_TRIGGER_EPWM0_SOCA,
.channel = ADC_CH_ADCIN0,
.sampleWindow = 15,
.socTrigger = ADC_INT_SOC_TRIGGER_NONE,

I am able to read ADC0 AIN2, AIN4 perfectly

Thanks

Baljeet

over 3 years ago

0 Frank Livingston over 3 years ago

TI__Mastermind 29528 points

Hi Baljeet,

Are you using AM263x MCU+SDK?

Have you checked the ADC examples in the SDK? Many of these examples use ADC AIN0. For example, please see: https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/08_03_01_06/exports/docs/api_guide_am263x/EXAMPLES_DRIVERS_ADC_MULTIPLE_SOC_EPWM.html,

Please note some of these examples use an TMDSHSECDOCK for access to the ADC input pins.

Regards,
Frank

0 Baljeet Bhatti over 3 years ago in reply to Frank Livingston

Prodigy 130 points

Hi Frank,

I am using mcu_plus_sdk_am263x_08_03_01_06 and PROC110E2(001) eval board.

Realized that I was not setting the correct values on the I2C IO expander to control the mux (U160), now it is corrected, but still, the value on ADC0 AIN0 is not 0 when connected to GND, there is always an offset of around 35-40. what could be wrong?

Thanks

Baljeet

0 Frank Livingston over 3 years ago in reply to Baljeet Bhatti

TI__Mastermind 29528 points

Hi Baljeet,

Are you using the AM263x Control Card (https://www.ti.com/tool/TMDSCNCD263)? How are you accessing ADC0 AIN0 on this board? Inspecting the schematic, the only connection I see to ADC0 AIN0 is through the HSEC.

Regards,
Frank

0 Baljeet Bhatti over 3 years ago in reply to Frank Livingston

Prodigy 130 points

Hi Frank,

I am using AM263x Control Card (https://www.ti.com/tool/TMDSCNCD263) with HSEC, sorry should I should have mentioned it earlier.

Thanks

Baljeet

0 Frank Livingston over 3 years ago in reply to Baljeet Bhatti

TI__Mastermind 29528 points

Hi Baljeet,

Ok, there are several examples in the SDK that use the AM263x Control Card and HSECDOCK with ADC0 AIN0:

Can you please try one of these and see if you obtain good results for ADC AIN0?

Regards,
Frank

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AM2634: ADC0 Channel AIN0 not working