AM2632-Q1: AM2632-Q1 UART Wakeup for BQ79616

Tom Tsao

Part Number: AM2632-Q1
Other Parts Discussed in Thread: BQ79616,

Tool/software:

Hello TI team,

We are currently using AM2632-Q1 communicating with BQ79616 AFE.
Based on the sample code provided for TMS570 + BQ79616, the procedure to wake up the BQ79616 from sleep mode is:

Switch the MCU’s UART RX pin to GPIO mode.
Drive the pin Low for a short period to trigger the AFE wake-up.
Switch the pin back to UART mode for normal communication.

Does TI provide any sample code or guidance on how to implement this UART-to-GPIO switching on AM2632-Q1?

Are there recommended drivers or APIs in MCAL / SDK to handle this pin muxing dynamically?

Any suggestions or examples would be greatly appreciated.

Thank you!

1 month ago

0 Shaunak Deshpande 1 month ago

TI__Genius 12901 points

Hi Tom,

Are you using the mcu+sdk or mcal sdk?

Regards,

Shaunak

0 Tom Tsao 1 month ago in reply to Shaunak Deshpande

Expert 1430 points

Hi Shaunak,

I am using the MCU+SDK.

Thanks!

0 Shaunak Deshpande 1 month ago

TI__Genius 12901 points

Hi Tom,

On the AM263x, If you want to use the Same pin to work as Both GPIO for some time and then UART, you can do the following:

1. Locate the pin being shared between GPIO and UART. If using UART0_RX, GPIO27 is shared

2. In your application, when you want to switch to GPIO from UART, you will have to take care of pending UART interrupts and operations first

3. Then, based on the above screenshot, modify the PinMux for PIN_UART0_RXD from mode 0 to Mode 7 for GPIO. Sample code for UART Rx:

For GPIO mode, change the Pin Mode to 7

4. With the above config, call the "Pinmux_config" API, passing the pinmuxCfg struct and domainID.

5. Drive the GPIO low using the GPIO APIs: https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/latest/exports/docs/api_guide_am263x/DRIVERS_GPIO_PAGE.html

6. Use pin mode 0 again to switch back to UART mode by calling the Pinmux_config() function again.

Regards,
Shaunak

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AM2632-Q1: AM2632-Q1 UART Wakeup for BQ79616