attiny-hal: add watchdog support

This has been tested on the ATtiny85, but compiles for all other parts as well
and should work.

mcu/attiny-hal/src/lib.rs

@@ -76,6 +76,11 @@ pub use port::Pins;
 #[cfg(feature = "device-selected")]
 pub mod simple_pwm;
 
+#[cfg(feature = "device-selected")]
+pub mod wdt;
+#[cfg(feature = "device-selected")]
+pub use wdt::Wdt;
+
 #[cfg(feature = "device-selected")]
 pub mod eeprom;
 #[cfg(feature = "device-selected")]

mcu/attiny-hal/src/wdt.rs

@@ -0,0 +1,44 @@
+#[allow(unused_imports)]
+pub use avr_hal_generic::wdt::{Timeout, WdtOps};
+
+pub type Wdt = avr_hal_generic::wdt::Wdt<crate::Attiny, crate::pac::WDT>;
+
+#[cfg(any(feature = "attiny85", feature = "attiny167", feature = "attiny2313"))]
+avr_hal_generic::impl_wdt! {
+    hal: crate::Attiny,
+    peripheral: crate::pac::WDT,
+    mcusr: crate::pac::cpu::MCUSR,
+    wdtcsr_name: wdtcr,
+    timeout: |to, w| match to {
+        Timeout::Ms16 => w.wdpl().cycles_2k_512k(),
+        Timeout::Ms32 => w.wdpl().cycles_4k_1024k(),
+        Timeout::Ms64 => w.wdpl().cycles_8k(),
+        Timeout::Ms125 => w.wdpl().cycles_16k(),
+        Timeout::Ms250 => w.wdpl().cycles_32k(),
+        Timeout::Ms500 => w.wdpl().cycles_64k(),
+        Timeout::Ms1000 => w.wdpl().cycles_128k(),
+        Timeout::Ms2000 => w.wdpl().cycles_256k(),
+        Timeout::Ms4000 => w.wdph().set_bit().wdpl().cycles_2k_512k(),
+        Timeout::Ms8000 => w.wdph().set_bit().wdpl().cycles_4k_1024k(),
+    },
+}
+
+#[cfg(any(feature = "attiny84", feature = "attiny88"))]
+avr_hal_generic::impl_wdt! {
+    hal: crate::Attiny,
+    peripheral: crate::pac::WDT,
+    mcusr: crate::pac::cpu::MCUSR,
+    wdtcsr_name: wdtcsr,
+    timeout: |to, w| match to {
+        Timeout::Ms16 => w.wdpl().cycles_2k_512k(),
+        Timeout::Ms32 => w.wdpl().cycles_4k_1024k(),
+        Timeout::Ms64 => w.wdpl().cycles_8k(),
+        Timeout::Ms125 => w.wdpl().cycles_16k(),
+        Timeout::Ms250 => w.wdpl().cycles_32k(),
+        Timeout::Ms500 => w.wdpl().cycles_64k(),
+        Timeout::Ms1000 => w.wdpl().cycles_128k(),
+        Timeout::Ms2000 => w.wdpl().cycles_256k(),
+        Timeout::Ms4000 => w.wdph().set_bit().wdpl().cycles_2k_512k(),
+        Timeout::Ms8000 => w.wdph().set_bit().wdpl().cycles_4k_1024k(),
+    },
+}