edison.md: add details on i2c bus number
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
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@@ -9,6 +9,7 @@ Currently the Arduino breakout board is supported by libmraa.
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The Edison used with the Arduino board has the following limitations
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in libmraa:
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- i2c is exposed on i2c-6, therfore you must use bus 6 and not bus 0
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- PWM avaible on default swizzler postions. (3,5,6,9)
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- SPI exposed is also used for the ADC. Try not to use your own CS.
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- ADC kernel module will return 12bit number but the ADC itself only has an
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