nuclei-sdk/application/baremetal/helloworld/main.c

// See LICENSE for license details.
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include "nuclei_sdk_soc.h"

void print_misa(void)
{
    CSR_MISA_Type misa_bits = (CSR_MISA_Type) __RV_CSR_READ(CSR_MISA);
    static char misa_chars[30];
    uint8_t index = 0;
    if (misa_bits.b.mxl == 1) {
        misa_chars[index++] = '3';
        misa_chars[index++] = '2';
    } else if (misa_bits.b.mxl == 2) {
        misa_chars[index++] = '6';
        misa_chars[index++] = '4';
    } else if (misa_bits.b.mxl == 3) {
        misa_chars[index++] = '1';
        misa_chars[index++] = '2';
        misa_chars[index++] = '8';
    }
    if (misa_bits.b.i) {
        misa_chars[index++] = 'I';
    }
    if (misa_bits.b.m) {
        misa_chars[index++] = 'M';
    }
    if (misa_bits.b.a) {
        misa_chars[index++] = 'A';
    }
    if (misa_bits.b.b) {
        misa_chars[index++] = 'B';
    }
    if (misa_bits.b.c) {
        misa_chars[index++] = 'C';
    }
    if (misa_bits.b.e) {
        misa_chars[index++] = 'E';
    }
    if (misa_bits.b.f) {
        misa_chars[index++] = 'F';
    }
    if (misa_bits.b.d) {
        misa_chars[index++] = 'D';
    }
    if (misa_bits.b.q) {
        misa_chars[index++] = 'Q';
    }
    if (misa_bits.b.h) {
        misa_chars[index++] = 'H';
    }
    if (misa_bits.b.j) {
        misa_chars[index++] = 'J';
    }
    if (misa_bits.b.l) {
        misa_chars[index++] = 'L';
    }
    if (misa_bits.b.n) {
        misa_chars[index++] = 'N';
    }
    if (misa_bits.b.s) {
        misa_chars[index++] = 'S';
    }
    if (misa_bits.b.p) {
        misa_chars[index++] = 'P';
    }
    if (misa_bits.b.t) {
        misa_chars[index++] = 'T';
    }
    if (misa_bits.b.u) {
        misa_chars[index++] = 'U';
    }
    if (misa_bits.b.v) {
        misa_chars[index++] = 'V';
    }
    if (misa_bits.b.x) {
        misa_chars[index++] = 'X';
    }

    misa_chars[index++] = '\0';

    printf("MISA: RV%s\r\n", misa_chars);
}

#ifndef CFG_SIMULATION
#define RUN_LOOPS   20
#else
#define RUN_LOOPS   5
#endif

int main(void)
{
    uint32_t rval, seed;
    unsigned long hartid;
    rv_csr_t misa;

    // get hart id of current cluster
    hartid = __get_hart_id();
    misa = __RV_CSR_READ(CSR_MISA);

    printf("Hart %lu, MISA: 0x%lx\r\n", hartid, misa);
    print_misa();

    // Generate random value with seed
    seed = (uint32_t)(__get_rv_cycle()  | __get_rv_instret() | __RV_CSR_READ(CSR_MCYCLE));
    srand(seed);
    rval = rand();
    printf("Got rand integer %d using seed %d.\r\n", seed, rval);

    for (unsigned long i = 0; i < RUN_LOOPS; i ++) {
        printf("%lu: Hello World From Nuclei RISC-V Processor!\r\n", i);
    }

    return 0;
}