How to use struct.pack for uart?

OpenMV Products
1

hi,i am trying to sent binary data to stm32.
here is my code:

uart = UART(1, 115200, timeout_char=1000)                        
uart.init(115200, bits=8, parity=None, stop=1, timeout_char=1000)


def uart_sent(reason,data_):
    global uart
    needtosend = struct.pack("cc",reason.to_bytes(1,byteorder='little'),data_.to_bytes(1,byteorder='little'))
    uart.write(needtosend)
    return

but when i called “uart_sent” function like this:
uart_sent(0x00,0xff)

I got error:
Traceback (most recent call last):
File “”, line 172, in
File “”, line 41, in uart_sent
TypeError: function doesn’t take keyword arguments

but I do the same thing in jupyter notebook to test my code:

image
image1657×250 19.7 KB

this code can work perfectly.
forgive my poor english :sob:

2

Hi, you need to use the API for the OpenMV Cam. We don’t have an emulator in Jupiter notebooks… so, whatever code you run there that’s not pure Python doesn’t transfer.

3

Thank for your answer.now,i am using struct.pack(“bb”,reason,data_) instead of the previous code. * The code works as I expected. :smile: