6 years ago.

Can NUCLEO-L432KC board use asynchronous serial communication?

Hello all, I am trying to use asynchronous serial.

1. Currently, I am using serial.putc() or serial.printf() functions to send data. However it is not possible to process other tasks until completion of the data-transmitting currently. As I know, when using asynchronous serial, the write function returns immediately after sending tx_buffer. And the MCU process process other tasks while UART hardware transmits the buffered data independently. Is it right?

2. I found in the below site that there exists a library for async serial.

https://os.mbed.com/teams/SiliconLabs/wiki/Using-the-mbed-asynchronous-APIs

However, when I use the demo program (https://os.mbed.com/teams/SiliconLabs/code/Serial-LowPower-Demo/file/tip/main.cpp/), I failed to compile it since DEVICE_SERIAL_ASYNCH is not defined.

#if DEVICE_SERIAL_ASYNCH
Serial test_connection(USBTX, USBRX);
#else
#error "Platform not compatible with Low Power APIs for Serial"
#endif

Ok, I think that checks whether my platform supports asynchronous serial or not, and it says NUCLEO-L432KC board is not supported. However, STM32L432KC, MCU in the board supports asynchronous serial as shown in the datasheet.

Can anyone tell me how to use asynchronous serial?

Thank you in advance.