__LL_I2C_SPEED_FAST_TO_CCR macro

Compute Speed Fast clock range to a Clock Control Register (I2C_CCR_CCR) value.

Syntax

#define __LL_I2C_SPEED_FAST_TO_CCR(__PCLK__, __SPEED__, __DUTYCYCLE__) (uint32_t)(((__DUTYCYCLE__) == LL_I2C_DUTYCYCLE_2)? \ (((((__PCLK__) / ((__SPEED__) * 3U)) & I2C_CCR_CCR) == 0U)? 1U:((__PCLK__) / ((__SPEED__) * 3U))) : \ (((((__PCLK__) / ((__SPEED__) * 25U)) & I2C_CCR_CCR) == 0U)? 1U:((__PCLK__) / ((__SPEED__) * 25U))))

Arguments

PCLK

This parameter must be a value of peripheral clock (in Hz).

SPEED

This parameter must be a value between Min_Data=100Khz and Max_Data=400Khz (in Hz).

DUTYCYCLE

This parameter can be one of the following values: @arg LL_I2C_DUTYCYCLE_2 @arg LL_I2C_DUTYCYCLE_16_9

Return value

Value between Min_Data=0x001 and Max_Data=0xFFF

References

Location	Text
stm32f4xx_ll_i2c.h:322	#define __LL_I2C_SPEED_FAST_TO_CCR(__PCLK__, __SPEED__, __DUTYCYCLE__) (uint32_t)(((__DUTYCYCLE__) == LL_I2C_DUTYCYCLE_2)? \
stm32f4xx_ll_i2c.h:856	__LL_I2C_SPEED_FAST_TO_CCR(PeriphClock, ClockSpeed, DutyCycle) \| \