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edison.md: corrected ADC resolution data

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Edison kit for Arduino has TI ADS7951 ADC, which has "12-stored-in-16" bit
resolution.

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Alex Tereschenko
2015-06-07 09:56:37 +02:00
committed by Brendan Le Foll
parent 299bf5ab27
commit ae9130ee8f
1 changed files with 4 additions and 2 deletions
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6
docs/edison.md
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@@ -23,8 +23,10 @@ in libmraa:
- 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.
- ADC kernel module will return 16bit number but the ADC itself only has an
accuracy of maximum 12bits and in MRAA it's limited to 10bits by default.
Use `mraa_aio_set_bit(12)` to switch to the maximum resolution mode.
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
else. Therefore use `mraa_gpio_init(14)` to use A0 as a GPIO
- Arduino pin 7 can sometimes negatively impact the WiFi capability, if using