VAR-SOM-SD600 gpio: Difference between revisions
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<a href="[http://mondi.web.cs.unibo.it/gpio_control.html http://mondi.web.cs.unibo.it/gpio_control.html]">[http://mondi.web.cs.unibo.it/gpio_control.html http://mondi.web.cs.unibo.it/gpio_control.html]</a> | <a href="[http://mondi.web.cs.unibo.it/gpio_control.html http://mondi.web.cs.unibo.it/gpio_control.html]">[http://mondi.web.cs.unibo.it/gpio_control.html http://mondi.web.cs.unibo.it/gpio_control.html]</a> | ||
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= PinMux configuration = | = 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. or example struct apq8064_gsbi2_UART2_configs configures GPIO pins 22,23,24 and 25 to serial port. | 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. or example struct apq8064_gsbi2_UART2_configs configures GPIO pins 22,23,24 and 25 to serial port. | ||
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= Generic serial bus interface (GSBI)= | |||
The APQ8064 implements twelve Generic Serial Bus Interface (GSBI) ports. GSBI ports :an be configured for: | |||
*UART_DM | |||
*I2C | |||
* UART_DM | *SPI | ||
* I2C | *General-purpose I/O (GPIO) bits | ||
* SPI | |||
* General-purpose I/O (GPIO) bits | |||
Please refer to datasheet section: "Table 4_2 Detailed serial interface pinout" for elaborated list. | Please refer to datasheet section: "Table 4_2 Detailed serial interface pinout" for elaborated list. | ||
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Revision as of 14:20, 4 May 2014
GPIOs features
- 90 GPIO pins (GPIO_0 to GPIO_89)
- Configurable pull-up/down
- Configurable output drive current
- Interruptable GPIOs
GPIO manipulation
The usage / API is well described in kernel/Documentation/gpio.txt.
Additional useful links: <a href="http://elinux.org/GPIO">http://elinux.org/GPIO</a>
<a href="https://developer.ridgerun.com/wiki/index.php/Gpio-int-test.c">https://developer.ridgerun.com/wiki/index.php/Gpio-int-test.c</a>
<a href="https://developer.ridgerun.com/wiki/index.php/How_to_use_GPIO_signals">https://developer.ridgerun.com/wiki/index.php/How_to_use_GPIO_signals</a>
<a href="http://mondi.web.cs.unibo.it/gpio_control.html">http://mondi.web.cs.unibo.it/gpio_control.html</a>
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. or example struct apq8064_gsbi2_UART2_configs configures GPIO pins 22,23,24 and 25 to serial port.
Generic serial bus interface (GSBI)
The APQ8064 implements twelve Generic Serial Bus Interface (GSBI) ports. GSBI ports :an be configured for:
- UART_DM
- I2C
- SPI
- General-purpose I/O (GPIO) bits
Please refer to datasheet section: "Table 4_2 Detailed serial interface pinout" for elaborated list.