TMDS64EVM: UART reception using DMA

Hello Swargam Anil.

Thank you for your reply.

>How do you synchronize PC timer with the CR5 timer ?

There is a tool that monitors the EVM's GPIO and sends data between the PC and the EVM.
CR5 hits GPIO in the timer handler and uses it as a trigger to send data from the PC.

Please resolve the issue as soon as possible.

Best regards,
Kiyomasa Imaizumi.

Hello Swargam Anil.

I solved this problem myself.

It seems that the size specification of the send/receive buffer in DMA was incorrect.

However, is it okay to call the UART_read and UART_write functions during an interrupt?

Best regards,

Kiyomasa Imaizumi.

Kiyomasa Imaizumi said:

However, is it okay to call the UART_read and UART_write functions during an interrupt?

Hello Kiyomasa Imaizumi,

Just you can  see how much time is taken by the read and write functions, which is mostly less than your 4K Hz interrupt otherwise it creates an issues .

My suggestion is that you just split that write and read functionalities into different functions.

Like DMA channel initializations and DMA start.

There is a queraw function which is mainly used to start the DMA. 

Initialization is done only one time and uses queraw function to start the DMA in every interrupt and the same approach is applied for both TX and Rx channels.

Regards,

Anil.

Hello Swargam Anil.

Thank you for your reply.

Please give me some sample code that uses queraw function.

Best reagrds,
Kiyomasa Imaizumi.