From edc8283572d4f7648146b05d49dc446e169d4534 Mon Sep 17 00:00:00 2001
From: Mikkel Jeppesen <2756925+Duckle29@users.noreply.github.com>
Date: Sat, 31 Aug 2019 02:47:11 +0200
Subject: [PATCH] Removed prescaler define from avr i2c, as it was impossible
 to use (#6617)

---
 docs/i2c_driver.md       | 1 -
 drivers/avr/i2c_master.c | 4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/docs/i2c_driver.md b/docs/i2c_driver.md
index 317307e1bf..856ca0a9b2 100644
--- a/docs/i2c_driver.md
+++ b/docs/i2c_driver.md
@@ -34,7 +34,6 @@ The following defines can be used to configure the I2C master driver.
 |Variable          |Description                                        |Default|
 |------------------|---------------------------------------------------|-------|
 |`F_SCL`           |Clock frequency in Hz                              |400KHz |
-|`Prescaler`       |Divides master clock to aid in I2C clock selection |1      |
 
 AVRs usually have set GPIO which turn into I2C pins, therefore no further configuration is required.
 
diff --git a/drivers/avr/i2c_master.c b/drivers/avr/i2c_master.c
index 52924437e0..c084d5754f 100644
--- a/drivers/avr/i2c_master.c
+++ b/drivers/avr/i2c_master.c
@@ -27,8 +27,8 @@
 #ifndef F_SCL
 #    define F_SCL 400000UL  // SCL frequency
 #endif
-#define Prescaler 1
-#define TWBR_val ((((F_CPU / F_SCL) / Prescaler) - 16) / 2)
+
+#define TWBR_val (((F_CPU / F_SCL) - 16) / 2)
 
 void i2c_init(void) {
     TWSR = 0; /* no prescaler */