From 2106119b9fe5450b50ddc7b0e9c1ad7ca1c1e48a Mon Sep 17 00:00:00 2001
From: ZYQ-FEIYUE <1404806582@qq.com>
Date: Sun, 11 Sep 2022 23:13:29 +0800
Subject: [PATCH] add SoftwareSerial and fix some bug

---
 cores/arduino/SoftwareSerial.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cores/arduino/SoftwareSerial.cpp b/cores/arduino/SoftwareSerial.cpp
index 02680f8..fee6c6a 100644
--- a/cores/arduino/SoftwareSerial.cpp
+++ b/cores/arduino/SoftwareSerial.cpp
@@ -130,8 +130,8 @@ void SoftwareSerial::setSpeed(uint32_t speed)
           pre *= 2;
         }
       } while (cmp_value >= UINT16_MAX);
-      Timer_SetPrescaler(TIMER_SERIAL, pre);
-      Timer_SetReload(TIMER_SERIAL, cmp_value);
+      Timer_SetPrescaler(TIMER_SERIAL, pre - 1);
+      Timer_SetReload(TIMER_SERIAL, cmp_value - 1);
       Timer_SetCounter(TIMER_SERIAL, 0);
       // Timer_Resume(TIMER_SERIAL);
     } else {