tut4 with busy and request

fsm-tut4/sim/top.cc

@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "verilated.h"
+#include "verilated_vcd_c.h"
+#include "Vtop.h"
+
+void	tick(int tickcount, Vtop *tb, VerilatedVcdC* tfp) {
+   tb->eval();
+   if (tfp)
+      tfp->dump(tickcount * 10 - 2);
+   tb->i_clk = 1;
+   tb->eval();
+   if (tfp)
+      tfp->dump(tickcount * 10);
+   tb->i_clk = 0;
+   tb->eval();
+   if (tfp) {
+      tfp->dump(tickcount * 10 + 5);
+      tfp->flush();
+   }
+}
+
+int main(int argc, char **argv) {
+   // Call commandArgs first!
+   Verilated::commandArgs(argc, argv);
+
+   // Instantiate our design
+   Vtop *tb = new Vtop;
+   Verilated::traceEverOn(true);
+   VerilatedVcdC* tfp = new VerilatedVcdC;
+
+   tb->trace(tfp, 99);
+   tfp->open("build/waveform.vcd");
+
+	int	last_led, last_state = 0, state = 0;
+	printf("Initial state is: 0x%02x\n", tb->o_led);
+   unsigned tickcount = 0;
+   last_led = tb->o_led;
+
+   tb->i_request = 1;
+
+   for (int k = 0; k < 4; k++) {
+      tick(++tickcount, tb, tfp);
+   }
+
+   tick(++tickcount, tb, tfp);
+   tb->i_request = 0;
+   tick(++tickcount, tb, tfp);
+   tb->i_request = 1;
+
+   for(int k=0; k<(1 << 16); k++) {
+      tick(++tickcount, tb, tfp);
+
+      // if (last_led != tb->o_led) {
+      // printf("k = %7d, led = %d\n", k, tb->o_led);
+      // }
+
+      last_led = tb->o_led;
+   }
+}