I'm trying to get some C code to do some frequency measurements on the PRU
GPIOs, and then to write the results to the PRU shared RAM so it can be
retrieved and acted upon by the linux loader C code.
So the PRU C code executes, and I have some values ready to store. My
initial method of attack to achieve this was to write some inline assembly
to store the results to the shared memory. But I'm having trouble with this
- the clpru compiler will not permit me to use the MOV command inline (is
this just me or is it a thing?).
void shm_test()
{
__asm__ __volatile__
(
" MOV r3, 0x00002222 \n" // r3 will store the freq
" MOV r0, 0x00000008 \n" // going to write the result to this
address
" SBBO r3, r0, 0, 4 \n" // store the count at this address
);
}
The above will not compile (MOV and SBBO seem to be forbidden by the
compiler).
When I've been looking for examples of using C code on the PRU the methods
used to write to the shared memory seem rather complex (and many use inline
assembly that is pretty opaque to me) - e.g Fabien Le Mentec's pruss_c
example from his pru_sdk repo:
http://www.embeddedrelated.com/showarticle/603.php
Can someone point me to a decent example of getting C on the PRU to write
to shared RAM (e.g. 0x00010000).
Cheers,
Jon Ross
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