BeagleBone PRU remote procedure call concept

pru_rpc_concept.c

#include "pru_rpc.h"

/* This is a function that supports remote calling from the kernel or userspace. 
 */
PRU_RPC_return_code RPC_digitalWrite(PRU_RPC_args *args) {
  uint8_t pin, state;
  if (PRU_RPC_ParseArgs(args, "bb", &pin, &state) < 0) {
    return PRU_RPC_INVALID_ARGS;
  }
  if (state) {
    __R30 |= ( 1 << pin);
  }
  else {
    __R30 &= ~( 1 << pin);
  }
  return PRU_RPC_SUCCESS;
}


void rpcInit() {
  // Register the function to be called with the name digitalWrite:
  PRU_RPC_RegisterFunction("digitalWrite", RPC_digitalWrite);

  // That could also tell the kernel driver that there is a "digitalWrite"
  // procedure available, so it could then tell userspace applications what
  // remote calls the currently loaded firmware supports
}


int main() {
  rpcInit();
  while(1) {
    // Do other stuff here, the RPC driver will automatically call RPC_digitalWrite
    //if it gets the "digitalWrite" command from the kernel
  }
  return 0;
}