MicroPython Forum (Archive)

Hi guys, I'm wrote code in main.py of the Pyboard using the pyserial module. Unfortunately, when I run the program, the pyboard does not know what the serial module is. How can I import this module through REPL given that the Pyboard is a bare metal computer and thus does not have access to the terminal?

Hi,

pyserial is a library for "big" Python (CPython).

On an embedded device, you'll likely be achieving the same result using a UART directly. https://docs.micropython.org/en/latest/ ... .UART.html and https://docs.micropython.org/en/latest/ ... serial-bus

The UART IDs (e.g. the `1` in the example in the quick reference) are labeled on the pin diagram at https://store.micropython.org/product/PYBv1.1H#image4 (e.g. UART 1 is X9 / X10)

Thanks for the response. Is there any way I can do the same with a serial connection over USB using the pyserial module? I'm trying to connect the Pyboard to the Raspberry Pi.

You can use pyserial on the Raspberry Pi and use the Pyboard UART as per the doc references @jimmo gave you.

If you want to use the USB on the PyBoard for that communication, you can use the pyb.USB_VCP class for receiving and sending. You can use pyb.USB_CVP.any() to tell, if characters are buffered for reading.

I've connected a microbit to raspberry pi with direct uart to uart connection

Thank you all for the responses. I've found using the pyb.UCB_VCP method to be easiest because it still allows me to use the USB connection on both ends. However, a follow up question I have is with the write function of this class. I am attempting to do the following:

USB_VCP.write(("hello\r\n").encode())

However, the error I receive is "argument has wrong type". Does anyone know why?

You need to instantiate an object. Your code should look like:. Note that b'hello\r\n' 'hello\r\n'.encode() or ('hello\r\n').encode() all produce the same thing (namely b'hello\r\n')

dhylands wrote: ↑

Mon Jun 10, 2019 10:23 pm

You need to instantiate an object. Your code should look like:

Code: Select all

usb = pyb.USB_VCP()
usb.write(b'helllo\r\n')

. Note that b'hello\r\n' 'hello\r\n'.encode() or ('hello\r\n').encode() all produce the same thing (namely b'hello\r\n')

This worked perfectly. Thank you all so much for the help!

Hi all,

Another question I have is if there is any way to set an interrupt for every time data reaches USB_VCP. I have an infinite loop running elsewhere in the code but I want to be able to keep reading from this port in case I want to keep sending new data from the RPi. Any suggestions and examples would be great. Thanks!