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Add Led_blinker example #17

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Add Led_blinker example #17

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2991b50
Add Led_blinker example
JorgenAagesen Feb 23, 2024
809b4ba
Add config.gtkw which has most useful signals; fix some bugs in the .…
magnmaeh Mar 13, 2024
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108 changes: 108 additions & 0 deletions examples/Led_blinker/Led_blinker.sv
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Original file line number Diff line number Diff line change
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module Led_blinker
(
i_clock,
i_reset,
i_enable,
i_switch_1,
i_switch_2,
o_led_drive
);

input i_clock;
input i_reset;
input i_enable;
input i_switch_1;
input i_switch_2;
output o_led_drive;

parameter c_CNT_100HZ = 125;
parameter c_CNT_50HZ = 250;
parameter c_CNT_10HZ = 1250;
parameter c_CNT_1HZ = 12500;

reg [31:0] r_CNT_100HZ = 0;
reg [31:0] r_CNT_50HZ = 0;
reg [31:0] r_CNT_10HZ = 0;
reg [31:0] r_CNT_1HZ = 0;

reg r_TOGGLE_100HZ = 1'b0;
reg r_TOGGLE_50HZ = 1'b0;
reg r_TOGGLE_10HZ = 1'b0;
reg r_TOGGLE_1HZ = 1'b0;

reg r_LED_SELECT = 1'b0;

always @(posedge i_clock)
begin
if (i_reset == 1)
begin
r_CNT_100HZ <= 0;
r_CNT_50HZ <= 0;
r_CNT_10HZ <= 0;
r_CNT_1HZ <= 0;

r_TOGGLE_100HZ <= 0;
r_TOGGLE_50HZ <= 0;
r_TOGGLE_10HZ <= 0;
r_TOGGLE_1HZ <= 0;
end
end

always @(posedge i_clock)
begin
if (r_CNT_100HZ == c_CNT_100HZ - 1)
begin
r_TOGGLE_100HZ <= !r_TOGGLE_100HZ;
r_CNT_100HZ <= 0;
end
else
r_CNT_100HZ <= r_CNT_100HZ + 1;
end

always @(posedge i_clock)
begin
if (r_CNT_50HZ == c_CNT_50HZ - 1)
begin
r_TOGGLE_50HZ <= !r_TOGGLE_50HZ;
r_CNT_50HZ <= 0;
end
else
r_CNT_50HZ <= r_CNT_50HZ + 1;
end

always @(posedge i_clock)
begin
if (r_CNT_10HZ == c_CNT_10HZ - 1)
begin
r_TOGGLE_10HZ <= !r_TOGGLE_10HZ;
r_CNT_10HZ <= 0;
end
else
r_CNT_10HZ <= r_CNT_10HZ + 1;
end

always @(posedge i_clock)
begin
if (r_CNT_1HZ == c_CNT_1HZ - 1)
begin
r_TOGGLE_1HZ <= !r_TOGGLE_1HZ;
r_CNT_1HZ <= 0;
end
else
r_CNT_1HZ <= r_CNT_1HZ + 1;
end

always @(*) begin
case ({i_switch_1, i_switch_2})
/* verilator lint_off COMBDLY */
2'b11 : r_LED_SELECT <= r_TOGGLE_1HZ;
2'b10 : r_LED_SELECT <= r_TOGGLE_10HZ;
2'b01 : r_LED_SELECT <= r_TOGGLE_50HZ;
2'b00 : r_LED_SELECT <= r_TOGGLE_100HZ;
/* verilator lint_on COMBDLY */
endcase
end

assign o_led_drive = r_LED_SELECT & i_enable;

endmodule
32 changes: 32 additions & 0 deletions examples/Led_blinker/config.gtkw
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[*]
[*] GTKWave Analyzer v3.3.104 (w)1999-2020 BSI
[*] Fri Mar 8 17:16:35 2024
[*]
[dumpfile] "/home/magnus/ntnu/orbit/biosat-electronics-FPGA/electronics-verilator/examples/Led_blinker/trace.vcd"
[dumpfile_mtime] "Fri Mar 8 17:13:28 2024"
[dumpfile_size] 49174
[savefile] "/home/magnus/ntnu/orbit/biosat-electronics-FPGA/electronics-verilator/examples/Led_blinker/config.gtkw"
[timestart] 0
[size] 1850 1016
[pos] -51 -51
*0.000000 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
[treeopen] TOP.
[sst_width] 233
[signals_width] 166
[sst_expanded] 1
[sst_vpaned_height] 289
@28
TOP.Led_blinker.i_clock
TOP.Led_blinker.i_enable
TOP.Led_blinker.i_reset
TOP.Led_blinker.i_switch_1
TOP.Led_blinker.i_switch_2
TOP.Led_blinker.o_led_drive
@22
TOP.Led_blinker.r_CNT_1HZ[31:0]
TOP.Led_blinker.r_CNT_10HZ[31:0]
TOP.Led_blinker.r_CNT_50HZ[31:0]
@23
TOP.Led_blinker.r_CNT_100HZ[31:0]
[pattern_trace] 1
[pattern_trace] 0
6 changes: 6 additions & 0 deletions examples/Led_blinker/makefile
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VERILATOR_ROOT := ../..
PROJECT_NAME := Led_blinker
SOURCES := *.sv
SIMFILES := *.cpp

include $(VERILATOR_ROOT)/verilator.mk
100 changes: 100 additions & 0 deletions examples/Led_blinker/sim.cpp
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#include "VLed_blinker.h"
#include "verilated.h"

// Needed for waveform generation
#include <verilated_vcd_c.h>

#include <cassert>
#include <vector>
#include <iostream>

void toggle_clk(VLed_blinker* top, VerilatedVcdC *trace, uint32_t *tickcount) {
top->i_clock = 0;
top->eval();
trace->dump(10 * (*tickcount)++);
top->i_clock = 1;
top->eval();
trace->dump(10 * (*tickcount)++);
}

void print_top(VLed_blinker *top) {
printf("i_enable: %i\n", top->i_enable);
printf("i_clock: %i\n", top->i_clock);
printf("i_switch_1: %i\n", top->i_switch_1);
printf("i_switch_2: %i\n", top->i_switch_2);
printf("o_led_drive: %i\n", top->o_led_drive);
}

int main(int argc, char** argv) {
VLed_blinker* top = new VLed_blinker;
Verilated::commandArgs(argc, argv);

// For waveform generation
uint32_t tickcount = 0;
Verilated::traceEverOn(true);

// Initialization of trace
VerilatedVcdC *trace = new VerilatedVcdC;
top->trace(trace, 99);
trace->open("trace.vcd");

// Set initial values
top->i_enable = 1;
top->i_reset = 0;
top->i_clock = 0;
top->i_switch_1 = 0;
top->i_switch_2 = 0;
top->eval();

int ret = 0;
uint32_t count_limits[] = {
125,
250,
1250,
12500
};
uint32_t count = 0;

for (int i = 0; i < sizeof(count_limits) / sizeof(count_limits[0]); i++) {
if (Verilated::gotFinish()) break;

top->i_switch_1 = (i & 0b01) ? 1 : 0;
top->i_switch_2 = (i & 0b10) ? 1 : 0;
top->i_reset = 0;

uint32_t count_limit = count_limits[i];
bool led_signal_expect = false;
for (int j = 0; j < 2*count_limit; j++) {
if (count == count_limit) {
led_signal_expect = true;
printf("Expect led signal high\n");
} else if (count == 2*count_limit) {
led_signal_expect = false;
printf("Expect led signal low\n");
}

if (top->o_led_drive != led_signal_expect) {
printf("top->o_led_drive: Got %i when %i expected\n", top->o_led_drive, led_signal_expect);
toggle_clk(top, trace, &tickcount);
ret = 1;
goto out;
}

toggle_clk(top, trace, &tickcount);
printf("\nit: %i\n", j);
print_top(top);
fflush(stdout);
count++;
}

printf("Toggled clock %i times. Reset\n", 2*count);
fflush(stdout);
}

out:
trace->close();
delete trace;

delete top;
return ret;
}
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