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Configure I2C Fast Mode when I2C freq is more than 100kHz #305

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Merged
merged 1 commit into from
Sep 3, 2018
Merged

Configure I2C Fast Mode when I2C freq is more than 100kHz #305

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13 changes: 12 additions & 1 deletion cores/arduino/stm32/twi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -261,7 +261,12 @@ void i2c_custom_init(i2c_t *obj, i2c_timing_e timing, uint32_t addressingMode, u
handle->Init.Timing = timing;
#else
handle->Init.ClockSpeed = timing;
handle->Init.DutyCycle = I2C_DUTYCYCLE_2;
/* Standard mode (sm) is up to 100kHz, then it's Fast mode (fm) */
/* In fast mode duty cyble bit must be set in CCR register */
if(timing > 100000)
handle->Init.DutyCycle = I2C_DUTYCYCLE_16_9;
else
handle->Init.DutyCycle = I2C_DUTYCYCLE_2;
#endif
handle->Init.OwnAddress1 = ownAddress;
handle->Init.OwnAddress2 = 0xFF;
Expand Down Expand Up @@ -326,6 +331,12 @@ void i2c_setTiming(i2c_t *obj, uint32_t frequency)
obj->handle.Init.Timing = f;
#else
obj->handle.Init.ClockSpeed = f;
/* Standard mode (sm) is up to 100kHz, then it's Fast mode (fm) */
/* In fast mode duty cyble bit must be set in CCR register */
if(frequency > 100000)
obj->handle.Init.DutyCycle = I2C_DUTYCYCLE_16_9;
else
obj->handle.Init.DutyCycle = I2C_DUTYCYCLE_2;
#endif
/*
else if(frequency <= 600000)
Expand Down