verilator/microwatt-verilator.cpp

   1 #include <stdlib.h>
   2 #include "Vmicrowatt.h"
   3 #include "verilated.h"
   4 #include "verilated_vcd_c.h"
   5
   6 /*
   7  * Current simulation time
   8  * This is a 64-bit integer to reduce wrap over issues and
   9  * allow modulus.  You can also use a double, if you wish.
  10  */
  11 vluint64_t main_time = 0;
  12
  13 /*
  14  * Called by $time in Verilog
  15  * converts to double, to match
  16  * what SystemC does
  17  */
  18 double sc_time_stamp(void)
  19 {
  20         return main_time;
  21 }
  22
  23 #if VM_TRACE
  24 VerilatedVcdC *tfp;
  25 #endif
  26
  27 void tick(Vmicrowatt *top)
  28 {
  29         top->ext_clk = 1;
  30         top->eval();
  31 #if VM_TRACE
  32         if (tfp)
  33                 tfp->dump((double) main_time);
  34 #endif
  35         main_time++;
  36
  37         top->ext_clk = 0;
  38         top->eval();
  39 #if VM_TRACE
  40         if (tfp)
  41                 tfp->dump((double) main_time);
  42 #endif
  43         main_time++;
  44 }
  45
  46 void uart_tx(unsigned char tx);
  47 unsigned char uart_rx(void);
  48
  49 int main(int argc, char **argv)
  50 {
  51         Verilated::commandArgs(argc, argv);
  52
  53         // init top verilog instance
  54         Vmicrowatt* top = new Vmicrowatt;
  55
  56 #if VM_TRACE
  57         // init trace dump
  58         Verilated::traceEverOn(true);
  59         tfp = new VerilatedVcdC;
  60         top->trace(tfp, 99);
  61         tfp->open("microwatt-verilator.vcd");
  62 #endif
  63
  64         // Reset
  65         top->ext_rst = 0;
  66         for (unsigned long i = 0; i < 5; i++)
  67                 tick(top);
  68         top->ext_rst = 1;
  69
  70         while(!Verilated::gotFinish()) {
  71                 tick(top);
  72
  73                 uart_tx(top->uart0_txd);
  74                 top->uart0_rxd = uart_rx();
  75         }
  76
  77 #if VM_TRACE
  78         tfp->close();
  79         delete tfp;
  80 #endif
  81
  82         delete top;
  83 }