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Using USART-1 for HostTestApp on CC2541EM

Other Parts Discussed in Thread: CC2541

Hi,

I've been using the HostTestApp on CC2541EM with BTool, and everything is working well on the default HCI port USART-0.

Now I would like to use USART-1 instead, and therefore make the following compiler switch changes to the original code:

HAL_UART_DMA = 2 (instead of 1 by default)
HAL_LCD=FALSE
HAL_LED=FALSE 

But it was not working. I can see uart signals coming out from BTool, but there's no reply (signal) from CC2541.
Can anyone advise what else I've missed out in order to use USART-1 for HostTestApp ? Thanks in advance!

Btw, I am using BLE stack 1.2.1.

- Thomas