From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 21 Jan 2022 13:06:31 +0000 (+0000)
Subject: going to be adding verilator save/restore state
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1feba2cdf64e2958e3f3e160c68d5ac049b8d344;p=microwatt.git

going to be adding verilator save/restore state
however the simulated-uart will be in some unknown state at the time,
on restore.  as a "cheat", only save when the tx and rx state machines
are both in IDLE
---

diff --git a/verilator/uart-verilator.c b/verilator/uart-verilator.c
index 8492a11..0346f6b 100644
--- a/verilator/uart-verilator.c
+++ b/verilator/uart-verilator.c
@@ -251,3 +251,11 @@ unsigned char uart_rx(void)
 
 	return rx;
 }
+
+// cheating, here: to avoid having to save the uart state, check if it
+// is idle (both tx and rx)
+bool uart_idle(void)
+{
+	return (tx_state == IDLE && rx_state == IDLE);
+}
+