CCS/AM5728: UART timeout interval

Chason

Prodigy 60 points

Part Number: AM5728

Tool/software: Code Composer Studio

Board: Beagleboard x15

SDK Version: PROCESSOR-SDK-RTOS-AM57X 05_03_00_07

I use this version sdk to develop my program which need to use the UART_read() function.

I use this function in blocking mode successfully. But the time of the timeout is too long.

The timeout of UART_read work in millisecond, how can I change it to microsecond.

Thanks.

over 6 years ago

0 Chason over 6 years ago

Prodigy 60 points

1) If I change "Clock.tickPeriod" in .cfg file, will it effect to the uart function?

2) Are there any examples or documents can I reference?

Thanks.

0 Rahul Prabhu over 6 years ago

TI__Guru** 116170 points

UART timeout is a configurable parameter in the latest Processor SDK RTOS. By default the timeout is configured as WAIT_FOREVER, you can set this from application by configuring the UART transaction as part of the initialization.

For reference, check the function UART_test_timeout that is provided in the UART test source file

PDK_INSTALL_PATH\packages\ti\drv\uart\test\src

UART driver uses Osal_pendLock when in blocking mode so I believe it uses the clock ticks from BIOS. You can try to change the clockTick as described by Todd here but my guess is default clock ticks only provides millisecond granualrity:

https://e2e.ti.com/support/legacy_forums/embedded/tirtos/f/355/t/413946

Regards,

Rahul

0 Chason over 6 years ago in reply to Rahul Prabhu

Prodigy 60 points

it works when I change the granualrity of clock.

The Osal_pendLock really use the BIOS clock tick.

Thanks your help!

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CCS/AM5728: UART timeout interval