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-rw-r--r--docs/i2c_driver.md1
-rw-r--r--drivers/avr/i2c_master.c4
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 */