VAR-SOM-SD600 gpios

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Revision as of 11:50, 4 May 2014 by Oren (talk | contribs)

1 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












2 GPIO manipulation

GPIO manipulation is done through the standard gpiolib
The usage / API is well described in kernel/Documentation/gpio.txt.










Additional useful links:

http://elinux.org/GPIO

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


3 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.