pass bytearray from C code to mpy in timer ISR

[ajie_dirgantara]

I am trying to return a bytearray from C code as below :

Code: Select all

STATIC mp_obj_t prog_getAllData(void) {
	return mp_obj_new_bytearray(sizeof(dataDI.bytes), (mp_obj_t*)&dataDI.bytes);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(prog_getAllData_obj, prog_getAllData);

when I used it as :

Code: Select all

import prog
prog.getAllData()

it works fine,

but when I use it in timer callback, it return memory error as :

Code: Select all

>>>uncaught exception in Timer(3) interrupt handler
Traceback (most recent call last):
  File "<stdin>", line 2, in test
MemoryError: memory allocation failed, heap is locked

Is there really no other way to use list/bytearray in ISR?

[pythoncoder]

You need to pre-allocate the bytearray and have the ISR populate it. For the ISR to access the bytearray it can be global. Alternatively the bytearray can be a class variable and the ISR a bound method.

See http://docs.micropython.org/en/latest/p ... rules.html.