spi/tests/write_read.cpp

#include <stdio.h>
#include <verilated.h>
#include "Vsimtop.h"

Vsimtop *sim;
int return_value = 0;

#ifdef SPI_MASTER_SS
# define SET_SS(mod, v)
#else
# define SET_SS(mod,v) ((mod)->ss = (v))
#endif

uint32_t main_time = 0;

double sc_time_stamp() {
	return main_time;
}

static void progress() {
	sim->eval();
	main_time++;
	sim->clk = !sim->clk;
	sim->eval();
	main_time++;
	sim->clk = !sim->clk;
}

static void progress_n(int f) {
	for (int i = 0; i < f; i++)
		progress();
}

static void test_reset_pin(void) {
	sim->rst_L = 0;
	progress();
	sim->rdy = 1;
	sim->activate = 1;

	progress_n(200);
	assert(!sim->master_finished);
	sim->rst_L = 1;
}

static void test_cross_transfer(unsigned m2s, unsigned s2m) {
#ifndef SPI_MASTER_NO_WRITE
	sim->master_to_slave = m2s;
#endif
#ifndef SPI_MASTER_NO_READ
	sim->slave_to_master = s2m;
#endif

	sim->rst_L = 1;
	progress();
	SET_SS(sim, 1);
	sim->rdy = 1;
	sim->activate = 1;
	progress();

	while (!sim->master_finished)
		progress();

	progress_n(5);
	sim->activate = 0;
	SET_SS(sim, 0);
	sim->rdy = 0;
	progress_n(5);

	if (sim->err) {
		printf("slave error\n");
		return_value = 1;
	}

#ifndef SPI_MASTER_NO_WRITE
	if (sim->master_to_slave != sim->from_master) {
		printf("(m2s) %lx != %lx\n", sim->master_to_slave, sim->from_master);
		return_value = 1;
	}
#endif

#ifndef SPI_MASTER_NO_READ
	if (sim->slave_to_master != sim->from_slave) {
		printf("(m2s) %lx != %lx\n", sim->slave_to_master, sim->from_slave);
		return_value = 1;
	}
#endif
}

static void test_interrupted(unsigned m2s, unsigned s2m) {
	sim->rst_L = 1;
	progress();

	sim->rdy = 1;
	sim->activate = 1;
	progress_n(6);
	sim->rst_L = 0;
	progress_n(100);
	sim->rst_L = 1;
	test_cross_transfer(m2s, s2m);
}

int main(int argc, char **argv) {
	Verilated::commandArgs(argc, argv);
	Verilated::traceEverOn(true);

	sim = new Vsimtop;
	SET_SS(sim, 0);
	sim->clk = 0;
	sim->activate = 0;
	sim->rdy = 0;

	test_reset_pin();
	test_cross_transfer(0b101010101010101010101010, 0b010101010101010101010101);
	test_cross_transfer(0b110011001100110011001100, 0b001100110011001100110011);
	test_reset_pin();

	for (int i = 0; i < 10000; i++) {
		unsigned m2s = rand() & ((1 << WID) - 1);
		unsigned s2m = rand() & ((1 << WID) - 1);
		if (i % (((rand() + 1) % 32) + 1) == 0)
			test_interrupted(m2s, s2m);
		else
			test_cross_transfer(m2s, s2m);
		if (i % (((rand() + 1) % 64) + 1) == 0)
			test_reset_pin();

	}

	sim->final();
	delete sim;
	return return_value;
}