addition.c

/**
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <stdlib.h>
#include <stdio.h>

#include "pico/stdlib.h"
#include "hardware/pio.h"
#include "addition.pio.h"

// Pop quiz: how many additions does the processor do when calling this function
uint32_t do_addition(PIO pio, uint sm, uint32_t a, uint32_t b) {
    pio_sm_put_blocking(pio, sm, a);
    pio_sm_put_blocking(pio, sm, b);
    return pio_sm_get_blocking(pio, sm);
}

int main() {
    stdio_init_all();

    PIO pio = pio0;
    uint sm = 0;
    uint offset = pio_add_program(pio, &addition_program);
    addition_program_init(pio, sm, offset);

    printf("Doing some random additions:\n");
    for (int i = 0; i < 10; ++i) {
        uint a = rand() % 100;
        uint b = rand() % 100;
        printf("%u + %u = %u\n", a, b, do_addition(pio, sm, a, b));
    }
}