From c4f67378aed6321ede7ce4b34b095251f30b36af Mon Sep 17 00:00:00 2001
From: Allen Hill <allenofthehills@gmail.com>
Date: Sun, 20 Aug 2023 20:41:25 -0400
Subject: [PATCH] Use alternate UART TxD/RxD pins

---
 com232.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/com232.c b/com232.c
index 7336341..cadedd0 100644
--- a/com232.c
+++ b/com232.c
@@ -34,6 +34,8 @@ byte readkey;
 void RS232_Init(void) {
   RS232_RxCharBegin = RS232_RxCharEnd = 0;
 
+  PORTMUX.CTRLB = PORTMUX_USART0_ALTERNATE_gc; // Use PA1/PA2 for TxD/RxD
+
   USART0.CTRLA = USART_RXCIE_bm; // Enable receive interrupts
   USART0.CTRLB = USART_RXEN_bm | USART_TXEN_bm |
                  USART_RXMODE_NORMAL_gc; // Enable Rx/Tx and set receive mode