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Ignore initial garbage in verilator UART decoder

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This commit is contained in:
Olof Kindgren 2019-10-21 15:26:05 +02:00
parent 574464a33b
commit 57b4fca05f
1 changed files with 8 additions and 4 deletions
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12
bench/servant_tb.cpp
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@ -47,22 +47,26 @@ void uart_init(uart_context_t *context, uint32_t baud_rate) {
void do_uart(uart_context_t *context, bool rx) {
if (context->state == 0) {
if (rx)
context->state++;
}
else if (context->state == 1) {
if (!rx) {
context->last_update = main_time + context->baud_t/2;
context->state++;
}
}
else if(context->state == 1) {
else if(context->state == 2) {
if (main_time > context->last_update) {
context->last_update += context->baud_t;
context->ch = 0;
context->state++;
}
}
else if (context->state < 10) {
else if (context->state < 11) {
if (main_time > context->last_update) {
context->last_update += context->baud_t;
context->ch |= rx << (context->state-2);
context->ch |= rx << (context->state-3);
context->state++;
}
}
@ -70,7 +74,7 @@ void do_uart(uart_context_t *context, bool rx) {
if (main_time > context->last_update) {
context->last_update += context->baud_t;
putchar(context->ch);
context->state=0;
context->state=1;
}
}
}