VAR-SOM-SD600 gpios: Difference between revisions
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*Configurable output drive current | *Configurable output drive current | ||
*Interruptable GPIOs | *Interruptable GPIOs | ||
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= GPIO manipulation = | = GPIO manipulation = | ||
<div><div>GPIO manipulation is done through the standard gpiolib<br/>The usage / API is well described in kernel/Documentation/gpio.txt.<br/></div><div><br/><br/></div><div>Additional useful links:</div><div> | <div><div>GPIO manipulation is done through the standard gpiolib<br/>The usage / API is well described in kernel/Documentation/gpio.txt.<br/><br/><br/><br/><br/><br/><br/></div><div><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/></div><div>Additional useful links:</div><div> | ||
[http://elinux.org/GPIO http://elinux.org/GPIO] | [http://elinux.org/GPIO http://elinux.org/GPIO] | ||
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= PinMux configuration<br/> = | = PinMux configuration<br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/> <br/><br/><br/><br/><br/> <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/> = | ||
<br/><span style="font-size: 12px;">GPIO mux configuration is done in kernel\arch\arm\mach-msm\board-8064-gpiomux.c</span> <br/> | <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><span style="font-size: 12px;">GPIO mux configuration is done in kernel\arch\arm\mach-msm\board-8064-gpiomux.c</span> <br/> <br/><br/><br/><br/><br/><br/> <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/> | ||
At apq8064_init_gpiomux(void) you can find several examples of pinmux configuration | At apq8064_init_gpiomux(void) you can find several examples of pinmux configuration | ||
for example struct apq8064_gsbi2_UART2_configs configures GPIO pins 22,23,24 and 25 to serial port. | for example struct apq8064_gsbi2_UART2_configs configures GPIO pins 22,23,24 and 25 to serial port. | ||
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Latest revision as of 10:51, 4 May 2014
GPIOs features
The APQ8064 SoC GPIOs features are as follows
- 90 GPIO pins (GPIO_0 to GPIO_89)
- Configurable pull-up/down
- Configurable output drive current
- Interruptable GPIOs
GPIO manipulation
GPIO manipulation is done through the standard gpiolib
The usage / API is well described in kernel/Documentation/gpio.txt.
The usage / API is well described in kernel/Documentation/gpio.txt.
Additional useful links:
https://developer.ridgerun.com/wiki/index.php/Gpio-int-test.c
https://developer.ridgerun.com/wiki/index.php/How_to_use_GPIO_signals
http://mondi.web.cs.unibo.it/gpio_control.html
PinMux configuration
GPIO mux configuration is done in kernel\arch\arm\mach-msm\board-8064-gpiomux.c
At apq8064_init_gpiomux(void) you can find several examples of pinmux configuration
for example struct apq8064_gsbi2_UART2_configs configures GPIO pins 22,23,24 and 25 to serial port.