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For an 8 MiB flash this could look like: Here, we have full control of all the pin settings. For instance, on the NGW the three subdirectories a, b and sys are in that directory. This should rather be done in the board code than in the original code, which would result in an incompatibility with already existing boards. The device datasheet lists available TWI modules. Some messages should appear when we print out the kernel messages with dmesg. The cs value selects a chip select line.

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The device id in combination with the name must be unique. The non-blocking method can be used in conjunction with the poll interface. This file system exists only in RAM and is empty until client modules are loaded.

After that the hardware can be initialized with the address. In that case remove this ar32 either in the Buildroot configuration or directly in the board setup code. In such cases a custom initialization is needed.

To enable the gpio-keys driver, activate the following selections in the gpo configuration Device Drivers Input device support: Also the path should point to the correct board. These parameters should be set in the board setup code if needed.

This is similar to the kernel boot command line. Use 0 for the first line, 1 for the second … The last parameter is a data structure that is defined as zvr32 No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products.


A glitch filter providing rejection of pulses lower than one-half of clock cycle. Mdev creates the device files dynamically and is normally installed by default.

View detail for AVR32744: 32-bit AVR AP7 Linux Custom Board Support

The last step is to add a flash device as a platform device to the system. The pin number al7 be calculated by using the macros in the file at32ap For an 8 MiB flash this could look like: There is no need to change the board setup code in this example, unless the switches are reserved for other purposes there.

The gpio-keys application included with this application note grabs events from an event device and prints it to stdout. An event is described by the following structure: No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products.

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The zp7 size of an attribute file is the size of a page bytes on the AVR32, but should always be read out by using a library function as getpagesize or similar. Possible values are defined as macros. If you want to control the pins as outputs and as inputs on PIOB, you can do it like this: The following command does the trick: 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: If we have several instances, each must have a different id.


To be able to control a LED with this class, the board setup code must be modified, if not already done on Atmel boards e. Check the datasheet for available modules.

Each of them represents a LED on the board.

View detail for AVR bit AVR AP7 Linux Custom Board Support |

The flags parameter is used to select specific pins of the SSC module that should be used. Also if modules have dependencies within each other the initialization zp7 is important. 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.

By reading of and writing to those files, a user-space application can configure GPIOs.

The U-Boot environment partition must be at least the size specified in the boot loader usually 64 KiB. The number of ljnux gpio device may be different if other gpio devices have been created before.

Following steps are needed to add a new board configuration.