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Add UART decoder

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This commit is contained in:
Olof Kindgren
2018-11-19 09:42:42 +01:00
parent f7b396601f
commit 6e034361d4
4 changed files with 68 additions and 15 deletions
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67
bench/serv_soc_tb.cpp
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@@ -25,21 +25,33 @@ void INThandler(int signal)
int main(int argc, char **argv, char **env)
{
vluint64_t sample_time = 0;
uint32_t insn = 0;
uint32_t ex_pc = 0;
int baud_rate = 0;
int baud_t = 0;
int uart_state = 0;
char uart_ch = 0;
Verilated::commandArgs(argc, argv);
Vserv_wrapper* top = new Vserv_wrapper;
const char *arg = Verilated::commandArgsPlusMatch("uart_baudrate=");
if (arg[0]) {
baud_rate = atoi(arg+15);
if (baud_rate) {
baud_t = 1000*1000*1000/baud_rate;
}
}
VerilatedVcdC * tfp = 0;
const char *vcd = Verilated::commandArgsPlusMatch("vcd=");
//if (vcd[0]) == '\0' || atoi(arg + 11) != 0)
Verilated::traceEverOn(true);
VerilatedVcdC* tfp = new VerilatedVcdC;
top->trace (tfp, 99);
tfp->open ("trace.vcd");
if (vcd[0]) {
Verilated::traceEverOn(true);
tfp = new VerilatedVcdC;
top->trace (tfp, 99);
tfp->open ("trace.vcd");
}
signal(SIGINT, INThandler);
@@ -47,14 +59,47 @@ int main(int argc, char **argv, char **env)
bool q = top->q;
while (!(done || Verilated::gotFinish())) {
top->eval();
tfp->dump(main_time);
/*if (q != top->q) {
q = top->q;
printf("%lu output is %s\n", main_time, q ? "ON" : "OFF");
if (tfp)
tfp->dump(main_time);
if (baud_rate) {
if (uart_state == 0) {
if (!top->q) {
sample_time = main_time + baud_t/2;
uart_state++;
}
}
else if(uart_state == 1) {
if (main_time > sample_time) {
sample_time += baud_t;
uart_ch = 0;
uart_state++;
}
}
else if (uart_state < 10) {
if (main_time > sample_time) {
sample_time += baud_t;
uart_ch |= top->q << (uart_state-2);
uart_state++;
}
}
else {
if (main_time > sample_time) {
sample_time += baud_t;
putchar(uart_ch);
uart_state=0;
}
}
}
/*else {
if (q != top->q) {
q = top->q;
printf("%lu output q is %s\n", main_time, q ? "ON" : "OFF");
}
}*/
top->wb_clk = !top->wb_clk;
main_time+=31.25;
}
tfp->close();
if (tfp)
tfp->close();
exit(0);
}