Modify UART Echo Back

Hi,

Can you please confirm which processor you are using? It would also be helpful if you can share which example code you are referring to?

Regards,
Anand Selvaraj.

I am using the UART Echo Back code for the ADSP-21489 Ez-kit.

Dan

Hi,

Thanks for your reply. Were you able to get the code working as it is? Can you let me know what you have modified in the code?

Regards,
Anand Selvaraj.

Hi,

Yes, the original UART Echo Back code works. I need the user to enter choices on the

Tera Term. for example

Message to user  

   Press 1 to calculate area of circle

   Press 2 to calculate area of square

   Enter your choice

The code needs to read the user response and continue executing.

My question is can this be done with ISR or do I use the polling method. Explain which option is better with brief example.

Dan

Hi,

Apologies for the delayed response.

The major difference between the core mode and DMA mode is that in core mode the core does the data transfers. For DMA mode, the DMA controller takes care of this.

The UART echo back example code uses core mode operation because each data word received from PC should be sent back immediately. Using the DMA mode may not be a good idea for this case. If you want to use DMA mode then you may need to send one set of data from the PC end. On the DSP end receive all of them in DMA mode and send them back.

Moreover, I would suggest you to verify if the baud rate at the DSP and PC matches correctly. Are you making sure that the UART settings (no of data, parity, stop bits, baud rate) are exactly the same on both DSP and PC ? Also, what do you see when you probe the UART_TX signal ? Do you see everything okay there?

Regards,
Anand Selvaraj.