send bytearray over UART

[trix]

hello,
i thought that i post this question a half hour aggo, but i can not find it back ?

no problem i asked again:

i want to send a bytearray over UART, but i'm not verry succesfull so far.
problem is, how to fill uart.write() ?
you can see in the first part of my posted code, how i fill the array.
the 2e part is how i want to send it.
how i want to do it now is "byte by byte" but I think this is not the right method
can anybody tell me how i have to do this ?
thanks in advance.

if scanner_uart.any():	# is anything comming from the scanner ?
                r15 = bytearray(230)
                scanner_uart.readinto(r15)               
                print("r15",[byte for byte in r15])
            
            #************** SEND DATA TO 2E PIC0 **********************************
                
            MAX485.value(1)			# 1 = write and 0 = read MAX485    
                
            for i in range (229):
                
                byte_to_send = r15 [i]
                scanner_uart.write(b'\byte_to_send')		#
                time.sleep_ms (1)
#                print(r7[i])
                
            MAX485.value(0)			# 1 = write and 0 = read MAX485 

[Larz60+]

note line 8, 1 is an integer 1, not 0x01 (bit 1), is this what you wanted?
what is the error you are getting?

[trix]

line 8 is a digital output, i change the name of this output to make it more clear (it was not a good name )

[deanhystad]

I do not understand your code. What is this supposed to do?

if scanner_uart.any():

I assume scanner_uart is a serial.Serial object, but serial.Serial objects don't have a method named "any".

Why do you do this?

r15 = bytearray(230)
scanner_uart.readinto(r15)   

instead of this?

r15 = scanner_uart.read(230)

And why do this:

            for i in range (229):
                 
                byte_to_send = r15 [i:i+1]  # Needs to be bytes, not int
                scanner_uart.write(byte_to_send) 
                time.sleep_ms (1)

Instead of:

scanner_uart.write(r15[:229])

Is the 1 ms wait important?

[trix]

I do not understand your code. What is this supposed to do?

if scanner_uart.any():

I assume scanner_uart is a serial.Serial object, but serial.Serial objects don't have a method named "any".

it waits till a mesage is comming on the UART

Why do you do this?

r15 = bytearray(230)
scanner_uart.readinto(r15)   

instead of this?

r15 = scanner_uart.read(230)

i think that is the same, only write shorter

And why do this:

            for i in range (229):
                 
                byte_to_send = r15 [i:i+1]  # Needs to be bytes, not int
                scanner_uart.write(byte_to_send) 
                time.sleep_ms (1)

Instead of:

scanner_uart.write(r15[:229])

Is the 1 ms wait important?

i think also it is the same but shorter, but shorter is simpler so better (but sometimes it doesn't become any easier to read).
the 1 mSec. was just for test some things, maybey i don't need this.

[deanhystad]

Are you using micropython? That is the only place I can find deinit() and any() for something related to uarts.

The micropython documentation says this about deinit()

You will not be able to call init() on the object after deinit(). A new instance needs to be created in that case.

But I don't think you need to deinit the uart. This thread discusses changing the pins attached to the uart bus.

https://github.com/orgs/micropython/discussions/11506

[trix]

indeed micro python, but I thought that was clear, am I in the wrong section?

[deanhystad]

In this thread you did not mention you are using micropython. That would be a good thing to mention next time. I found out you are using raspberry pi pico from reading this post:

https://python-forum.io/thread-43303-pos...#pid181814

And my response here, about remapping the UART to different pins, is a response to that post.

So if you want to read about remapping your UART to different pins, go look at this discussion:

https://github.com/orgs/micropython/discussions/11506

[DeaD_EyE]

@micropython

from machine import UART

uart = UART(1, rx=..., tx=..., baudrate=...)

send_buffer = bytearray(b"Hello World\r\n")
bytes_sent = uart.write(send_buffer)

print(f"{bytes_sent} bytes were sent over serial")

The return value of uart.write: https://docs.micropython.org/en/latest/l...UART.write

[trix]

sorry for the misunderstanding , and thanks for the link. I'll take a good look at that.