From 9245337ecffd2b6f87609bf9699163f828a9c8c2 Mon Sep 17 00:00:00 2001
From: sago35 <sago35@gmail.com>
Date: Wed, 16 Sep 2020 20:20:47 +0900
Subject: [PATCH] atsamd2x: fix BAUD value

---
 src/machine/machine_atsamd21.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/machine/machine_atsamd21.go b/src/machine/machine_atsamd21.go
index c8656029..3db0eb6e 100644
--- a/src/machine/machine_atsamd21.go
+++ b/src/machine/machine_atsamd21.go
@@ -1188,7 +1188,10 @@ func (spi SPI) Configure(config SPIConfig) error {
 	}
 
 	// Set synch speed for SPI
-	baudRate := (CPUFrequency() / (2 * config.Frequency)) - 1
+	baudRate := CPUFrequency() / (2 * config.Frequency)
+	if baudRate > 0 {
+		baudRate--
+	}
 	spi.Bus.BAUD.Set(uint8(baudRate))
 
 	// Enable SPI port.