Adds simple_pwm for the attiny84

Author: dalpil

mcu/attiny-hal/src/simple_pwm.rs

@@ -2,6 +2,82 @@ use avr_hal_generic::simple_pwm::Prescaler;
 
 use crate::port::*;
 
+#[cfg(feature = "attiny84")]
+avr_hal_generic::impl_simple_pwm! {
+    /// Use `TC0` for PWM (pins `PB2`, `PA7`)
+    pub struct Timer0Pwm {
+        timer: crate::pac::TC0,
+        init: |tim, prescaler| {
+            tim.tccr0a.modify(|_r, w| w.wgm0().pwm_fast());
+            tim.tccr0b.modify(|_r, w| match prescaler {
+                Prescaler::Direct => w.cs0().direct(),
+                Prescaler::Prescale8 => w.cs0().prescale_8(),
+                Prescaler::Prescale64 => w.cs0().prescale_64(),
+                Prescaler::Prescale256 => w.cs0().prescale_256(),
+                Prescaler::Prescale1024 => w.cs0().prescale_1024(),
+            });
+        },
+        pins: {
+            PB2: {
+                ocr: ocr0a,
+                into_pwm: |tim| if enable {
+                    tim.tccr0a.modify(|_r, w| w.com0a().match_clear());
+                } else {
+                    tim.tccr0a.modify(|_r, w| w.com0a().disconnected());
+                },
+            },
+
+            PA7: {
+                ocr: ocr0b,
+                into_pwm: |tim| if enable {
+                    tim.tccr0a.modify(|_r, w| w.com0b().match_clear());
+                } else {
+                    tim.tccr0a.modify(|_r, w| w.com0b().disconnected());
+                },
+            },
+        },
+    }
+}
+
+#[cfg(feature = "attiny84")]
+avr_hal_generic::impl_simple_pwm! {
+    /// Use `TC1` for PWM (pins `PA6`, 'PA5')
+    pub struct Timer1Pwm {
+        timer: crate::pac::TC1,
+        init: |tim, prescaler| {
+            tim.tccr1a.modify(|_, w| w.wgm1().bits(0b01));
+            tim.tccr1b.modify(|_, w| w.wgm1().bits(0b01));
+
+            tim.tccr1b.modify(|_r, w| match prescaler {
+                Prescaler::Direct => w.cs1().direct(),
+                Prescaler::Prescale8 => w.cs1().prescale_8(),
+                Prescaler::Prescale64 => w.cs1().prescale_64(),
+                Prescaler::Prescale256 => w.cs1().prescale_256(),
+                Prescaler::Prescale1024 => w.cs1().prescale_1024(),
+            });
+        },
+        pins: {
+            PA6: {
+                ocr: ocr1a,
+                into_pwm: |tim| if enable {
+                    tim.tccr1a.modify(|_, w| w.com1a().bits(0b10));
+                } else {
+                    tim.tccr1a.modify(|_, w| w.com1a().disconnected());
+                },
+            },
+
+            PA5: {
+                ocr: ocr1b,
+                into_pwm: |tim| if enable {
+                    tim.tccr1a.modify(|_, w| w.com1b().bits(0b10));
+                } else {
+                    tim.tccr1a.modify(|_, w| w.com1b().disconnected());
+                },
+            },
+        },
+    }
+}
+
 #[cfg(feature = "attiny85")]
 avr_hal_generic::impl_simple_pwm! {
     /// Use `TC0` for PWM (pins `PB0`, `PB1`)