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-rw-r--r--include/libopencm3/stm32/i2c.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/libopencm3/stm32/i2c.h b/include/libopencm3/stm32/i2c.h
index 05a4d16..1b2dc0e 100644
--- a/include/libopencm3/stm32/i2c.h
+++ b/include/libopencm3/stm32/i2c.h
@@ -321,9 +321,15 @@ LGPL License Terms @ref lgpl_license
#define I2C_CCR_FS (1 << 15)
/* DUTY: Fast Mode Duty Cycle */
+/** @defgroup i2c_duty_cycle I2C peripheral clock duty cycles
+@ingroup i2c_defines
+
+@{*/
#define I2C_CCR_DUTY (1 << 14)
#define I2C_CCR_DUTY_DIV2 0
#define I2C_CCR_DUTY_16_DIV_9 1
+/**@}*/
+
/* Note: Bits [13:12] are reserved, and forced to 0 by hardware. */
/*