I'm an absolute beginner in the field of pru. I was wondering what actually
takes place when a bin file is loaded into the instruction memory of a pru. I
looked through the prussdrv.c in am335x_pru_package file where application
loader api functions are located.
https://github.com/beagleboard/am335x_pru_package/blob/master/pru_sw/app_loader/interface/prussdrv.c
My question is in
int prussdrv_pru_write_memory (unsigned int pru_ram_id, unsigned int
wordoffset, unsigned int *memarea, unsigned int bytelength);
function scope
wordlength = (bytelength + 3) >> 2; //Adjust length as multiple of 4 bytes
for (i = 0; i < wordlength; i++) {
*(pruramarea + i + wordoffset) = *(memarea + i);
}
return wordlength;
why wordoffset is added to pruramarea which holds the the address of the
instruction memory.but according to this guide
http://processors.wiki.ti.com/index.php/PRU_Linux_Application_Loader_API_Guide
wordoffset is the offset from *memarea and I think wordoffset is to be added to
memarea instead , otherwise we are missing some parts of the instruction memory.
My other question is why pru instruction memory is said to be 8kB But according
to the trm pru global memory section the instruction memory is just 4k
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