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-rw-r--r--libmaple/include/libmaple/i2c.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/libmaple/include/libmaple/i2c.h b/libmaple/include/libmaple/i2c.h
index f7821af..ff1c313 100644
--- a/libmaple/include/libmaple/i2c.h
+++ b/libmaple/include/libmaple/i2c.h
@@ -181,7 +181,9 @@ typedef struct i2c_msg {
/* Clock control register */
#define I2C_CCR_FS (1U << 15) // Fast mode selection
-#define I2C_CCR_DUTY (1U << 14) // 16/9 duty ratio
+#define I2C_CCR_DUTY (1U << 14) // Fast mode duty cycle
+#define I2C_CCR_DUTY_2_1 (0U << 14) // Fast mode duty: 2/1
+#define I2C_CCR_DUTY_16_9 (1U << 14) // Fast mode duty: 16/9
#define I2C_CCR_CCR 0xFFF // Clock control bits
/*