Adding UART code to the 'light switch server' project

Hi Paul, 
It's complaining that the UART0 interrupt handler was defined twice. 
Could you do a full search (Ctrl+Shift+F) and look for "UARTE0_UART0_IRQHandler" ?
Note that in nrf51_to_nrf52.h file we have a define     #define UART0_IRQHandler        UARTE0_UART0_IRQHandler 
So if there is a define of UART0_IRQHandler function somewhere else then we will also have a multiple definition. 

Note that in mesh SDK we also have a serial library called serial_uart.c that you may use. 

I have done a search and there are 3 instances in the project and all in the same file. I have done a search for other IRQ's and they come back with 3 hits as well.

Do you have any example code of using the serial_uart.c and functions?

You can find the usage of the serial_uart.c library in the serial example in mesh SDK. However the use of this module in the example is not for logging but for serialization of mesh stack. 

There must be a define of UARTE0_UART0_IRQHandler inside nrfx_irqs_nrf52832.h if the file was included. 

Thanks that has sorted that out.

One more question though. I am getting the serial information in the debug window, but want it to come out on the virtual serial port the same as project 'uart_pca10056'. What do I change to make this happen?

You would need to modify the log.c to add log callback for uart instead of rtt. Then modify main.c to call __LOG_INIT with the callback to uart. 

Can you please give an example of this, even if it is text and not an actual example.

Can you please give an example of this, even if it is text and not an actual example.

Hi Paul, 

It turned out that the serial library in the mesh SDK is not capable of printing out a string so there is a buffer needed (this is implemented inside the serial.c library which related to mesh serialization, which we don't plan to use here). 
So we need to use the app_uart library in nRF5 SDK instead (this is the library that the log in nRF5 SDK uses).

I attached here the example I made for SDK v4.0 . Basically you need to add app_fifo, app_uart_fifo and retarget.c 
log.c is modified to log_serial.c to print out to serial instead of RTT. 
light_switch - SerialLog.zip