Arm Watchdog Module (SP805) driver

Driver implementation for the SP805 watchdog module.

Implemented features

Enable/disable watchdog timer
Update timer value

Example

use arm_sp805::{SP805Registers, Watchdog, UniqueMmioPointer};
use core::ptr::NonNull;
# use zerocopy::transmute_mut;
# let mut fake_registers = [0u32; 1024];
# let WATCHDOG_ADDRESS : *mut SP805Registers = transmute_mut!(&mut fake_registers);
# fn handler() {}

// SAFETY: `WATCHDOG_ADDRESS` is the base address of a SP805 watchdog register block. It remains
// valid for the lifetime of the application and nothing else references this address range.
let watchdog_pointer = unsafe { UniqueMmioPointer::new(NonNull::new(WATCHDOG_ADDRESS).unwrap()) };

let mut watchdog = Watchdog::new(watchdog_pointer, 0x0001_0000);
watchdog.enable();

loop {
  handler();
  watchdog.update();
  # break
}

License

The project is MIT and Apache-2.0 dual licensed, see LICENSE-APACHE and LICENSE-MIT.

Maintainers

arm-sp805 is a trustedfirmware.org maintained project. All contributions are ultimately merged by the maintainers listed below.

Bálint Dobszay balint.dobszay@arm.com balint-dobszay-arm
Imre Kis imre.kis@arm.com imre-kis-arm
Sandrine Afsa sandrine.afsa@arm.com sandrine-bailleux-arm

Contributing

Please follow the directions of the Trusted Firmware Processes

Contributions are handled through review.trustedfirmware.org.

Reporting Security Issues

Please follow the directions of the Trusted Firmware Security Center

Arm is a registered trademark of Arm Limited (or its subsidiaries or affiliates).