Firmwares/raven/hello_raven.c

#include <stdint.h>
#include <stdio.h>
#include <unistd.h>

#include "platform.h"
#include "encoding.h"

#define IOF_ENABLE_TERMINAL (0x30000)
int factorial(int i){

	volatile int result = 1;
	for (int ii = 1; ii <= i; ii++) {
		result = result * ii;
	}
	return result;

}



int main()
{
	GPIO_REG(GPIO_IOF_EN) |= IOF_ENABLE_TERMINAL; // enable GPIO connection to the terminal

    int hartid = read_csr(0xf14); // CSR_MHARTID
    int target_mem_base = 0x90000000;
    int local_mem_base  = 0x80000000;

    if (hartid == 0) {
    	int val_a = 2;
    	int val_b = 3;
    	*(int *)target_mem_base = val_a;
    	*(int *)(target_mem_base+4) = val_b;
    	printf("HW thread ID %d: write value A=%x and value B=%x to thread 1\n", hartid, val_a, val_b);
    }


    int result = factorial (10);
	printf("HW thread ID %d: spend some time calculating factorial of 10 = %x\n", hartid, result);

	if (hartid == 1) {
		int val_a = *(int *)local_mem_base;
		int val_b = *(int *)(local_mem_base+4);
		int sum = val_a + val_b;
    	printf("HW thread ID %d: sum of A+B=%x \n", hartid, sum);
	}

	printf("End of execution");
	return 0;
}