Correct ARM STM32 I2C frequency. (#7080)
It was beleaved that this setting result in a 400Khz I2C bus. This was incorrect, actual frequency measure with a logic analyzer was around 150Khz. This is derived from the excel sheet linked in the .h file. Also confirmed with the ST IDE.
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@ -73,19 +73,19 @@
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// The default timing values below configures the I2C clock to 400khz assuming a 72Mhz clock
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// For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html
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# ifndef I2C1_TIMINGR_PRESC
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# define I2C1_TIMINGR_PRESC 15U
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# define I2C1_TIMINGR_PRESC 0U
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# endif
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# ifndef I2C1_TIMINGR_SCLDEL
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# define I2C1_TIMINGR_SCLDEL 4U
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# define I2C1_TIMINGR_SCLDEL 7U
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# endif
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# ifndef I2C1_TIMINGR_SDADEL
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# define I2C1_TIMINGR_SDADEL 2U
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# define I2C1_TIMINGR_SDADEL 0U
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# endif
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# ifndef I2C1_TIMINGR_SCLH
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# define I2C1_TIMINGR_SCLH 15U
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# define I2C1_TIMINGR_SCLH 38U
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# endif
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# ifndef I2C1_TIMINGR_SCLL
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# define I2C1_TIMINGR_SCLL 21U
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# define I2C1_TIMINGR_SCLL 129U
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# endif
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#endif
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