It registers itself with configfs and is visible as sudirectory gpio. The following example shows how two switches on the ATSTK board can be used as inputs for the gpio-keys driver. The datasheet lists available external interrupt lines. To enable the gpio-keys driver, activate the following selections in the kernel configuration Device Drivers Input device support: This is an optional attribute of the LED class. The registering is carried out whether configfs is mounted or not, as the filesystem is always there. This should rather be done in the board code than in the original code, which would result in an incompatibility with already existing boards.
|Date Added:||7 March 2015|
|File Size:||44.89 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
The available module functions for each pin are listed in the device datasheet. The driver uses the Linux input system to deliver mouse events to user-space. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice.
This should rather be done in the board code than in the original code, which would result in an incompatibility with already existing boards. Avrr32 build the module, edit the Makefile and change the path settings to make it point to your Linux kernel sources.
The information in this document is provided in connection with Atmel products. If we have several instances, each must have a different id.
View detail for AVR32744: 32-bit AVR AP7 Linux Custom Board Support
Enables the gpio object. The needed functions and data to do this can be copied from one of the existing boards.
The first step is to set proper timings for the flash device. Because the kernel source changes over the time, a close look at the source code is mandatory to verify that the configurations described in this document are still valid. The data structure is defined as: On most systems, this is already done by the startup scripts.
The rest of the flash can be used to store the root file system or other data. An entry like the following is needed: In order to change the main clock and bus speeds the boot loader has to be recompiled with the new settings. Following steps are needed to add a new board configuration. The remaining three fields bleft, bmiddle and bright are the mouse buttons. To set output pins in user-space, use the Linux LED driver.
Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions gpko any time without notice.
Run the program with the flag —h to get all available options.
linux gpio driver_百度文库
By reading of and writing to those files, a user-space application can configure GPIOs. There is no need to change the board setup code in this example, unless the switches are reserved for other purposes there. For the above partitions the structure would be initialized like this: The boot loader sets up the main system clock and bus speeds and the kernel reads out these values. Also the path should point to the correct board.
See chapter 3 for detailed information on how to get the correct number. When we want to configure these settings in an application and not from the shell or a shell scriptthe following considerations must be taken into account: This file system exists only in RAM and is empty until client modules are loaded.
Numbers can either be written as a decimal e. The above methods, except for the blocking method and their possible implementations, are shown in the gpio-test application.
As periph value a definition from the device header file should be used. The second part of the USART initialization should be done in the other setup function that is called later in the boot process.
For instance, the X-server gets the mouse movements as events from the input system. Create a valid Linux kernel configuration for the custom board.