From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 21 Jan 2022 13:28:48 +0000 (+0000)
Subject: code-comments on uart in microwatt_verilator
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1ca7ce551904baaca96978f2d1557c3e162b780b;p=microwatt.git

code-comments on uart in microwatt_verilator
---

diff --git a/verilator/microwatt-verilator.cpp b/verilator/microwatt-verilator.cpp
index dea7c07..0dbbf29 100644
--- a/verilator/microwatt-verilator.cpp
+++ b/verilator/microwatt-verilator.cpp
@@ -49,9 +49,14 @@ void tick(Vmicrowatt *top, bool dump)
 	main_time++;
 }
 
+// simulated uart tx/rx, assumes a baud rate of 115200 based on CLK_FREQUENCY
 void uart_tx(unsigned char tx);
 unsigned char uart_rx(void);
 
+// true if the uart tx and rx are both idle
+// (saves having to save/restore/sync the uart state)
+bool uart_idle(void);
+
 // pretty-print dumped data in ASCII (to help identify strings)
 static void ascii_dump(unsigned char *data, int len, FILE *dump)
 {