AM2632: LP-AM263 ：Serial port transmission and reception issues

shijian chen

Part Number: AM2632

Tool/software:

Hello TI engineer

We have encountered a problem and need your help to solve it.

I am currently using the am263x evaluation board and I want to implement serial port transmission and reception functions, but the official example are all received according to the specified length.

The official example include these: UART Echo、UART Echo DMA、UART Echo Callback、UART Echo Low Latency Interrupt、UART Echo Low Latency Polling、UART Echo DMA LLD、UART Echo Interrupt LLD、UART Echo Polling LLD、UART HLD LLD External loopback，they all receive according to the specified length.

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The actual length of the data I receive may be random.

In this case, I want to receive them one by one into the cache through serial port interrupts, and then notify the upper layer to process the serial data.

Could you please provide me with a example of this type。

3 months ago

0 shijian chen 3 months ago

Prodigy 40 points

hello

I found a example that looks a bit like what I asked for above.

“UART Echo Low Latency Interrupt”，does this example give the interrupt handling to the user to handle？

0 Shaunak Deshpande 3 months ago in reply to shijian chen

TI__Genius 17782 points

Hi shijian chen,

Apologies for a delayed response.

shijian chen said:
but the official example are all received according to the specified length.

The examples in the SDK are based on a specific length, which is configured in the example.syscfg as the Rx or Tx FIFO threshold level. Only when the FIFO has that number of characters, the interrupt gets triggered. Right now we do not support reads/writes of variable sizes.

The simplest workaround I can think of is setting these trigger levels to 1, incase you know when new data arrives based on some start/stop bits in your UART data, you can add application logic to know when new frame has arrived (since the size is variable).

If the trigger level is set to 1, every character will be read/write from the UART FIFO.

Regards,
Shaunak