How to access the address of an object implementing the __buffer__ interface

[GuillaumeLeclerc]

Hello,

I would love to have access to the address of an array/bytesarray. without having to enter viper. This would be super useful to quickly write/read something using the mem32 array and reinterpret bytes -> ints etc...

Any easy way to do that ?

So far this is the "easieast" way I managed to do it but it's not super clean:

import micropython
from machine import mem32
from array import array

data = bytearray(100)

@micropython.viper
def extract_ptr_inner(d, arr):
    p = ptr32(d)
    arr2 = ptr32(arr)
    arr2[0] = int(p)

def extract_ptr(data):
    arr = array('L', [0])
    extract_ptr_inner(data, arr)
    return arr[0]

my_ptr = extract_ptr(data)
mem32[my_ptr] = 17
print(data[0:4])

[dlech]

Did you try uctypes?

[peterhinch]

Yes - specifically uctypes.addressof.

[GuillaumeLeclerc]

Looks great thanks!!