Hardware requirements for collecting modem traces.

Question

Hi, 
 As we are in design phase of our custom board based on nRF9160, can you please let us know what all pins needs to be exposed in our design for collecting modem traces? 
 regards 
 KK

Simon · Accepted Answer

I took a quick look at this and I think I figured out how to go about this. 
 I think the library bsd_os.c needs to be modified. 
 
 First, make sure UART2 is enabled in Kconfig and the device tree (It should be enabled by default in ncs\v1.3.0\zephyr\boards\arm
rf9160dk_nrf9160
rf9160dk_nrf9160_common.dts ) 
 Then change this line to NRFX_UARTE_INSTANCE( 2 ); 
 Then do some modifications to the function trace_uart_init() : 
 
 void trace_uart_init(void)
{
#ifdef CONFIG_BSD_LIBRARY_TRACE_ENABLED
	/* UART pins are defined in "nrf9160dk_nrf9160.dts". */
	const nrfx_uarte_config_t config = {
 /* Use UARTE1 pins routed on VCOM2. */
 //.pseltxd = DT_PROP(DT_NODELABEL(uart1), tx_pin),
 //.pselrxd = DT_PROP(DT_NODELABEL(uart1), rx_pin),
 .pseltxd = DT_PROP(DT_NODELABEL(uart2), tx_pin),
 .pselrxd = DT_PROP(DT_NODELABEL(uart2), rx_pin),
 .pselcts = NRF_UARTE_PSEL_DISCONNECTED,
 .
 .
 .
#endif
} 
 If you've not changed the UART pins in an overlay file it will output it on the TX pin defined in ncs\v1.3.0\zephyr\boards\arm
rf9160dk_nrf9160
rf9160dk_nrf9160_common.dts 
 I have not tested this myself, but I think this is the way to go about it. Report back to me if it's working or not. 
 Bes regards, 
 Simon

Hardware requirements for collecting modem traces.

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