AM2634-Q1: Redefinition Error with Multiple UART DMA LLD Instances - gUartDmaChCfg

Hi Rahul,

There was some change in our release commitments so the dates got changes internally along with the priority for bug fixes. I'm still working with the SDK team to get a fix for this.

Shaunak

Hi Rahul,

Please find attached the fix for the DMA LLD UART issue. Please replace these 3 files at the mentioned original locations in the SDK

File-1: uart_v0_lld.c

uart_v0_lld.c

Path: mcu_plus_sdk_am263x_10_02_00_13\source\drivers\uart\v0\lld

File-2: uart_open_close_config_v2_lld.c.xdt

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/908/2664.uart_5F00_open_5F00_close_5F00_config_5F00_v2_5F00_lld.c.xdt

Path: mcu_plus_sdk_am263x_10_02_00_13\source\sysconfig\drivers\.meta\uart\templates

File-3: uart_config_v2_lld.c.xdt

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/908/uart_5F00_config_5F00_v2_5F00_lld.c.xdt

Path: mcu_plus_sdk_am263x_10_02_00_13\source\sysconfig\drivers\.meta\uart\templates

After this, re-check the application configuration from syscfg and test.

Regards,
Shaunak

Hi Shaunak,

I believe it is working, but I will test it thoroughly and update you if I encounter any issues.

The only change I made in your files was to update the arguments in the read and write callback functions:

void `config.readCallbackFxn`(struct UARTLLD_Object_s *args)

TO 

void `config.readCallbackFxn`(void *args) 

void `config.writeCallbackFxn`(struct UARTLLD_Object_s *args) 

TO

void `config.writeCallbackFxn`(void *args) 

Thanks,
Rahul

Hi Shaunak,

I noticed that during the transfer, some bytes are getting missed, and it’s happening quite frequently. Please check the output below:

Available commands:
help: Show available commands
echo: Echo the arguments
led: Change LED state
uart: Send data on UART
> help
Available commands:
help: Show available commands
echo: Echo the arguments
d: Change LED state                 ------> 'le' missed 
uart: Send data on UART
> help  

As you can see in the above log, in the led: command, the characters "le" are missing.

Thanks,
Rahul

In SysConfig, the Transmit buffer size is limited to 56 bytes, and I am unable to set it higher. When I use the UART_lld_writeDma API to send more than 56 characters (for example, 100), the interrupt triggers twice instead of just once—ideally, one interrupt should occur only after all 100 bytes are transferred.

This behaviour prevents me from fully utilising DMA to efficiently transfer large amounts of data in a single operation.