AM6442: Configuring AM6442 ADC0 pins as GPI.

AMARNATH G

Part Number: AM6442
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

Dear Team,

We are using AM6442 in one of our design. We want to configure ADC0_AIN0 to ADC0_AIN6 as ADC input and configure ADC0_AIN7 pin (E20) alone as GPI functionality.

but in User Manual, the register CTRLMMR_ADC0_CTRL is having bit 16 GPI_MODE_EN which is described as: "Enables ADC0 data pins to be used as general purpose inputs when set. This signal is tied to the en_dig_test input of MCU_ADC0" => but there is nowhere else mentioned "en_dig_test" nor "MCU_ADC0" in the manual. So, it is difficult to ensure that it is pin by pin allowable/configurable as GPI & ADC0 function.

But there is a dedicated section to talk about that here: 12.1.1.4.2.2 ADC GPI Integration

And the sysconfig tool from TI is allowing to configure as an ADC or a GPI each of the 8 pins individually

So, for me it confirms that we can use only 1 pin (ADC0_AIN7) as a GPI when all others are ADC inputs.

Kindly confirm if above understanding is correct.

Also request you to share the procedure "How to configure a single pin as GPI & all others configured as ADC0".

Thank you.
Regards
Amarnath G

5 months ago

0 Tushar Thakur 5 months ago

TI__Mastermind 49248 points

Hi Amarnath,

AMARNATH G said:
And the sysconfig tool from TI is allowing to configure as an ADC or a GPI each of the 8 pins individually

So, for me it confirms that we can use only 1 pin (ADC0_AIN7) as a GPI when all others are ADC inputs.

Please refer to the 3 bullet of the shared screenshot. It says that all the ADC pins can either be configured as GPI or Analog input. You cannot use combination of both at a time for the group of ADC pins.

Regards,

Tushar

0 Kallikuppa Sreenivasa 5 months ago in reply to Tushar Thakur

TI__Guru**** 190839 points

Hi Amarnath,

There is a single register bit that changes all of the pins to operates as ADC or GPI

You could configure all the 8 pins either as ADC inputs or GPI inputs.

The below FAQ could help when configuring as GPI

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1304300/faq-am6442-adc0_dig_test-0-7-when-a-digital-inputs-can-these-eight-be-considered-as-main-gpio-and-or-interrupt-inputs-at-1-8v-logic/4954279?tisearch=e2e-sitesearch&keymatch=Am6442%25252525252520ADC0#4954279

Regards,

Sreenivasa

0 AMARNATH G 5 months ago in reply to Kallikuppa Sreenivasa

Prodigy 245 points

Hi Sreenivasa,

Thanks for your prompt response.

In sys config tool as we are able to configure the ADC0 interface as GPI & ADC individually for 8ADC0 pins, but your feedback above states that we cannot configure as GPI & ADC individually for 8ADC0 pins.

Since the Sys Config Tool and your feedback is contrary which one should be followed?

Thank you.
Regards
Amarnath G

0 Tushar Thakur 5 months ago in reply to AMARNATH G

TI__Mastermind 49248 points

Hi Amarnath,

AMARNATH G said:
Since the Sys Config Tool and your feedback is contrary which one should be followed?

By configure the GPI & ADC pin individually, do you mean you are able to configure 2 pins as GPI and other pins as ADC?

Regards,

Tushar

0 Kallikuppa Sreenivasa 5 months ago in reply to Tushar Thakur

TI__Guru**** 190839 points

Hello Amarnath

Kallikuppa Sreenivasa said:
There is a single register bit that changes all of the pins to operates as ADC or GPI

You could configure all the 8 pins either as ADC inputs or GPI inputs.

The inputs provided are based on the inputs from device expert.

The recommendation is to use the 8 signals as ADC or GPI as a group.

Regards,

Sreenivas

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AM6442: Configuring AM6442 ADC0 pins as GPI.