0

I have a problem understanding the following code:

PROGMEM  prog_uint16_t x={1232,3232,43343};
rawlen = pgm_read_word_near(x);
memcpy_P(uSendBuff, pfSendBuff+1, rawlen * sizeof(uint16_t));

Why do we need this? -

rawlen * sizeof(uint16_t));

Why not this? -

memcpy_P(uSendBuff, pfSendBuff+1, sizeof(rawlen));
2

Probably because x is an array of integers (although in the code you posted you miss the '[]'), thus memcpy_p should run over rawlen integers, each integer occupies sizeof(uint16_t) bytes, hence rawlen * sizeof(uint16_t) bytes in program memory space.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.