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tb_coremarksyn.cpp
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tb_coremarksyn.cpp
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#include "Vcpp_cpu_top.h"
#include <cstdio>
#include <fstream>
#include <verilated.h>
// Set the clock speed of your processor. 10MHz is the default.
static constexpr std::size_t clock_Hz = 10'000'000;
// UART baudrate
static constexpr std::size_t uart_Hz = 115200;
// The number of CoreMark iterations is depend on clock speed.
// Max: 30 seconds
static constexpr std::size_t max_cycle = 10'000 * clock_Hz;
std::size_t timer_ps = 0;
const std::size_t second = 1'000'000'000'000; // 1 second = 1,000,000,000,000 ps
void uart_rx(unsigned int u) {
static std::size_t s = 0;
static std::size_t b = 0;
static char c = 0;
if (s == 0 && u == 0) {
s = timer_ps;
b = 0;
c = 0;
} else if (s != 0 && s + second / uart_Hz / 2 * (2 * b + 3) < timer_ps) {
if (b < 8) {
c += u << b;
++b;
} else {
std::putchar(c);
std::fflush(stdout);
s = 0;
}
}
}
int main() {
Vcpp_cpu_top top;
top.clk = 0;
top.eval();
top.rstn = 0;
top.eval();
top.clk = 1;
top.eval();
top.clk = 0;
top.eval();
top.rstn = 1;
top.eval();
auto preinst = top.inst;
for (std::size_t cycle = 0; cycle < max_cycle; ++cycle) {
top.clk = 0;
top.eval();
top.clk = 1;
top.eval();
uart_rx(top.uart_tx);
timer_ps += second / clock_Hz;
if (top.is_stall) {
continue;
}
if (top.inst == preinst) {
break;
}
preinst = top.inst;
}
// wait 1 second for uart
for (std::size_t cycle = 0; cycle < clock_Hz; ++cycle) {
top.clk = 0;
top.eval();
top.clk = 1;
top.eval();
uart_rx(top.uart_tx);
timer_ps += second / clock_Hz;
}
}