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edison.md: add some SPI limitations

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
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Brendan Le Foll
2015-02-27 16:50:55 +00:00
parent a747c80f63
commit 2755c571ff
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docs/edison.md
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@@ -20,6 +20,9 @@ in libmraa:
- i2c is exposed on i2c-6, therfore you must use bus 6 and not bus 0
- PWM avaible on default swizzler postions. (3,5,6,9)
- SPI exposed is also used for the ADC. Try not to use your own CS.
- Max SPI speed is 25Mhz/4 ~6.25Mhz
- SPI PM can sometimes do weird things you can disable it with:
echo on > /sys/devices/pci0000\:00/0000\:00\:07.1/power/control
- ADC kernel module will return 12bit number but the ADC itself only has an
accuracy of 10bits. This ADC is only included on the arduino board.
- AIO pins are treated as 0-5 in mraa_aio_init() but as 14-19 for everything