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docs: explain aio numbering scheme

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
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Brendan Le Foll
2014-11-21 11:58:08 +00:00
parent 8f9059767f
commit 97e00d9298
3 changed files with 6 additions and 0 deletions
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2
docs/edison.md
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@@ -22,6 +22,8 @@ in libmraa:
- SPI exposed is also used for the ADC. Try not to use your own CS. - SPI exposed is also used for the ADC. Try not to use your own CS.
- ADC kernel module will return 12bit number but the ADC itself only has an - 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. 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
else. Therefore use mraa_gpio_init(14) to use A0 as a Gpio
Intel breakout board Intel breakout board
-------------------- --------------------

2
docs/galileorevd.md
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@@ -9,3 +9,5 @@ The rev D board has the following limitations in libmraa:
- gpio register access via /dev/uio is limited to pin2 and 3 - gpio register access via /dev/uio is limited to pin2 and 3
- gpio interupts will only work on GPIO_EDGE_BOTH - gpio interupts will only work on GPIO_EDGE_BOTH
- adc kernel module will return 12bit number. MRAA defaults shift this to 10bits - adc kernel module will return 12bit number. MRAA defaults shift this to 10bits
- 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

2
docs/galileorevh.md
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@@ -15,3 +15,5 @@ The Gen 2 board has the following limitations in libmraa:
all pwm channels all pwm channels
- adc kernel module will return 12bit number but the ADC itself only has an - adc kernel module will return 12bit number but the ADC itself only has an
accuracy of 10bits. accuracy of 10bits.
- 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