move to modular servicer design

ch32v-insert-coin/src/insert_coin/services/led.rs

@@ -0,0 +1,42 @@
+use ch32_hal::timer::Channel;
+
+use crate::insert_coin::services::{ServiceData, Service};
+
+pub struct LedService {
+    service_data: core::cell::RefCell<ServiceData>,
+    pub channel: Channel,
+    pub amplitude: u8,
+}
+
+impl LedService {
+    pub fn new(channel: Channel, service_data: ServiceData) -> Self {
+        Self {
+            service_data: core::cell::RefCell::new(service_data),
+            channel,
+            amplitude: 0,
+        }
+    }
+
+    pub fn set_amplitude(&mut self, amplitude: u8) {
+        self.amplitude = amplitude;
+    }
+}
+
+
+impl Service for LedService {
+    fn tick(&self) {
+        let mut tc = self.service_data.borrow_mut();
+        tc.ticks_remaining = tc.ticks_remaining.saturating_sub(1);
+    }
+
+    fn need_service(&self) -> bool {
+        self.service_data.borrow().ticks_remaining == 0
+    }
+
+    fn service(&self) {
+        let mut tc = self.service_data.borrow_mut();
+        tc.ticks_remaining = tc.ticks_per_service;
+    }
+}
+
+