UART printf

[gian]

Hi, I am playing with the SDK13 examples, UART (w/o softdevice). I use gnu gcc. The example runs and when I type q or Q the code goes to the printf(" \r\nExit!\r\n") as designed.

The problem is that I did not find a way to see that output on my terminal. I don't see printf("\r\nStart: \r\n") as well.

I tried with screen /dev/tty.SLAB_USBtoUART 115200 but the screen does not show anything.

What am I missing? Any suggestions?

[Hung Bui]

It seems that you only have RX on the device and no TX. Which hardware board are you using ? Have you made sure you connected all the UART pins properly ?

Can you capture a logic analyzer trace on the UART pins ? And maybe a photo of your setup

[gian]

Ok, I did some additional test and I confirm I can receive correctly but I am not able to transmit. I am using a PCA10040. I have a CP2102. On the PCA10040 I have connected RXD (p0.08) to TXD (CP2102), TDX (p0.06) to RXD(CP2102) and RTS (p0.05) to CTS(CP2102).

I have also installed another program iUARTAssistant...and I have the same results.

[gian]

I do not have a logic Analyzer

[gian]

ok there is a problem with the flow control. I have changed the structure: APP_UART_FLOW_CONTROL_ENABLED to APP_UART_FLOW_CONTROL_DISABLED, now I can see everything on screen.