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CC1352R: Understanding host test configuration

Part Number: CC1352R

Hello,

for qualification I am trying to set up the host_test project for our custom board. 

I am using UART for communication.

I am having trouble understand the setup for the direct test mode. 

In the host_test_app.c file I call dispHandle = Display_open(Display_Type_UART,NULL); and with the debugger I can see that the UART_init is then called from the DisplayUart.c.

I think this is expected behavior. However UART_init fails and dispHandle remains NULL.

Then I saw that in npi_tl_uart.c the UART driver is also initialized with success. 

 

I am now wondering who is suppossed to init the UART? 

What is the npi driver there for? 

Thanks in advance.