DART-SD410 Debian GPIO 5.7.0

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Revision as of 14:12, 26 November 2020 by Leonid (talk | contribs) (Created page with "{{PageHeader|DART-SD410 - Using GPIO}} {{DocImage|category1=DART-SD410|category2=Debian}} __toc__ User LED4 (D15) connected to GPIO2 of the PMIC. The LED4 is not in the apq801...")
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DART-SD410 - Using GPIO

User LED4 (D15) connected to GPIO2 of the PMIC. The LED4 is not in the apq8016-var-dt410.dtsi file under gpio-leds section.
This allows user access to this LED as a GPIO device. To change the state of the LED via serial console type:

# cd /sys/class/gpio
# echo 387 > export
This line creates a new directory gpio387
The number 387 calculated as 1 + 386. 1 is the GPIO number, 386 is static offset for PMIC gpio.
So changing any other PMIC GPIO will lead to 386 + GPIO number.
# cd gpio387
# echo out > direction
# echo 1 > value
The led will turn on
# echo 0 > value
The led will turn off

To read the current state type:

# cat value
The output will be 0

You can change active state to active low.

# echo 1 > active_low
# echo 0 > value
The led is active low, writing 0 will turn on the led.
# echo 1 > value
The led is active low, writing 1 will turn off the led.

The Boot Select switch (SW3) connected to CPU GPIO81 the gpio offset for CPU is 390. to read its value use:

# cd /sys/class/gpio
# echo 471 > export
# cd gpio471
# cat value
If the switch is in OFF position the output is 0.
If the switch is in ON position the output is 1.

To see all allocated GPIOs in the system type:

# cat /sys/kernel/debug/gpio
The output will be:
gpiochip2: GPIOs 382-385, parent: platform/200f000.spmi:pm8916@0:mpps@a000, 200f000.spmi:pm8916@0:mpps@a000:
 mpp1 : out  analog  vin-2 0 high
 mpp2 : out  digital vin-0 0 low
 mpp3 : out  digital vin-0 0 high
 mpp4 : out  digital vin-0 0 low

gpiochip1: GPIOs 386-389, parent: platform/200f000.spmi:pm8916@0:gpios@c000, 200f000.spmi:pm8916@0:gpios@c000:
 gpio1 : out  low  normal  vin-0 pull-down 10uA              push-pull  high    atest-0 dtest-0
 gpio2 : out  low  normal  vin-0 pull-down 10uA              push-pull  high    atest-0 dtest-0
 gpio3 : out  high normal  vin-0 pull-down 10uA              push-pull  high    atest-0 dtest-0
 gpio4 : out  high normal  vin-0 pull-down 10uA              push-pull  high    atest-0 dtest-0
gpiochip0: GPIOs 390-511, parent: platform/1000000.pinctrl, 1000000.pinctrl:
 gpio0   : in  high func2 16mA no pull
 gpio1   : in  low  func2 16mA no pull
 gpio2   : in  high func2 16mA no pull
 gpio3   : in  high func2 16mA no pull
 gpio4   : out low  func2 16mA no pull
 gpio5   : out low  func2 16mA no pull
 gpio6   : in  high func3 16mA no pull
 gpio7   : in  high func3 16mA no pull
 gpio8   : in  low  func1 12mA no pull
 gpio9   : in  low  func1 12mA no pull
 gpio10  : out high func0 16mA no pull
 gpio11  : in  low  func1 12mA no pull
 gpio12  : in  high func0 2mA pull down
 gpio13  : in  high func0 2mA pull down
 gpio14  : in  high func2 16mA no pull
 gpio15  : in  high func2 16mA no pull
 gpio16  : in  low  func1 12mA no pull
 gpio17  : in  low  func1 12mA no pull
 gpio18  : out high func0 16mA no pull
 gpio19  : in  low  func1 12mA no pull
 gpio20  : in  low  func0 2mA pull down
 gpio21  : out low  func0 2mA pull down
 gpio22  : in  high func2 16mA no pull
 gpio23  : in  high func2 16mA no pull
 gpio24  : in  low  func0 2mA pull down
 gpio25  : in  low  func0 2mA pull down
 gpio26  : in  low  func1 16mA no pull
 gpio27  : in  low  func1 16mA no pull
 gpio28  : out low  func0 16mA no pull
 gpio29  : in  high func1 16mA no pull
 gpio30  : in  high func1 16mA no pull
 gpio31  : in  high func0 2mA pull down
 gpio32  : out high func0 16mA no pull
 gpio33  : out low  func0 16mA no pull
 gpio34  : out low  func0 16mA no pull
 gpio35  : out low  func0 16mA no pull
 gpio36  : in  low  func0 2mA pull down
 gpio37  : in  low  func0 2mA pull down
 gpio38  : in  high func0 2mA pull up
 gpio39  : in  low  func0 2mA pull down
 gpio40  : in  low  func1 6mA pull down
 gpio41  : in  low  func1 6mA pull down
 gpio42  : in  low  func1 6mA pull down
 gpio43  : in  low  func1 6mA pull down
 gpio44  : in  low  func1 6mA pull down
 gpio45  : in  low  func0 2mA pull down
 gpio46  : in  low  func0 2mA pull down
 gpio47  : in  low  func0 2mA pull down
 gpio48  : in  low  func0 2mA pull down
 gpio49  : in  low  func0 2mA pull down
 gpio50  : in  low  func0 2mA pull down
 gpio51  : in  low  func0 2mA pull down
 gpio52  : in  low  func0 2mA pull down
 gpio53  : in  low  func0 2mA pull down
 gpio54  : in  low  func0 2mA pull down
 gpio55  : in  low  func0 2mA pull down
 gpio56  : in  low  func0 2mA pull down
 gpio57  : in  low  func0 2mA pull down
 gpio58  : in  low  func0 2mA pull down
 gpio59  : in  low  func0 2mA pull down
 gpio60  : in  low  func0 2mA pull down
 gpio61  : in  low  func0 2mA pull down
 gpio62  : in  low  func0 2mA pull down
 gpio63  : in  low  func1 8mA pull down
 gpio64  : in  low  func1 8mA pull down
 gpio65  : in  low  func1 8mA pull down
 gpio66  : in  low  func1 8mA pull down
 gpio67  : in  low  func1 8mA pull down
 gpio68  : in  low  func1 8mA pull down
 gpio69  : in  low  func0 2mA pull down
 gpio70  : in  low  func0 2mA pull down
 gpio71  : in  low  func0 2mA pull down
 gpio72  : in  low  func0 2mA pull down
 gpio73  : in  low  func0 2mA pull down
 gpio74  : in  low  func0 2mA pull down
 gpio75  : in  low  func0 2mA pull down
 gpio76  : in  low  func0 2mA pull down
 gpio77  : in  low  func0 2mA pull down
 gpio78  : in  low  func0 2mA pull down
 gpio79  : in  low  func0 2mA pull down
 gpio80  : in  low  func0 2mA pull down
 gpio81  : in  high func0 2mA pull down
 gpio82  : in  low  func0 2mA pull down
 gpio83  : in  low  func0 2mA pull down
 gpio84  : in  low  func0 2mA pull down
 gpio85  : in  low  func0 2mA pull down
 gpio86  : in  high func0 2mA pull down
 gpio87  : in  low  func0 2mA pull down
 gpio88  : in  low  func0 2mA pull down
 gpio89  : in  low  func0 2mA pull down
 gpio90  : in  low  func0 2mA pull down
 gpio91  : in  low  func0 2mA pull down
 gpio92  : in  low  func0 2mA pull down
 gpio93  : in  low  func0 2mA pull down
 gpio94  : in  low  func0 2mA pull down
 gpio95  : in  low  func0 2mA pull down
 gpio96  : out high func0 2mA no pull
 gpio97  : in  low  func0 2mA pull down
 gpio98  : in  low  func0 2mA pull down
 gpio99  : in  low  func0 2mA pull down
 gpio100 : in  low  func0 2mA pull down
 gpio101 : in  low  func0 2mA pull down
 gpio102 : in  low  func0 2mA pull down
 gpio103 : in  low  func0 2mA pull down
 gpio104 : in  low  func1 2mA no pull
 gpio105 : in  low  func0 2mA pull down
 gpio106 : in  low  func0 2mA pull down
 gpio107 : in  high func0 8mA pull up
 gpio108 : in  low  func0 2mA pull down
 gpio109 : in  low  func0 2mA pull down
 gpio110 : in  low  func0 2mA pull down
 gpio111 : in  low  func0 2mA pull down
 gpio112 : in  low  func1 8mA pull down
 gpio113 : in  low  func0 2mA pull down
 gpio114 : in  low  func0 2mA pull down
 gpio115 : in  low  func0 2mA pull down
 gpio116 : in  low  func1 8mA pull down
 gpio117 : in  low  func1 8mA pull down
 gpio118 : in  low  func1 8mA pull down
 gpio119 : in  low  func1 8mA pull down
 gpio120 : out low  func0 2mA pull down
 gpio121 : in  low  func0 8mA pull up

From this table you can see that offsets are:

  • CPU gpio is 390
  • PMIC gpio is 386
  • PMIC mpp is 382