perf!: centeral timekeeping

This should improve performance, especially when running simulations with
multiple peripherals. For instance, the demo project now runs at ~322%,
up from ~185% in AVR8js 0.13.1.

BREAKING CHANGE: `tick()` methods were removed from individual peripherals.
You now need to call `cpu.tick()` instead.

1 files changed, 2 insertions, 11 deletions

diff --git a/src/peripherals/twi.ts b/src/peripherals/twi.ts
index 914b67f..000bd2a 100644
--- a/src/peripherals/twi.ts
+++ b/src/peripherals/twi.ts
@@ -95,8 +95,6 @@ export class NoopTWIEventHandler implements TWIEventHandler {
 export class AVRTWI {
   public eventHandler: TWIEventHandler = new NoopTWIEventHandler(this);
 
-  private nextTick: (() => void) | null = null;
-
   // Interrupts
   private TWI: AVRInterruptConfig = {
     address: this.config.twiInterrupt,
@@ -116,7 +114,7 @@ export class AVRTWI {
       const { status } = this;
       if (clearInt && value & TWCR_TWEN) {
         const twdrValue = this.cpu.data[this.config.TWDR];
-        this.nextTick = () => {
+        this.cpu.addClockEvent(() => {
           if (value & TWCR_TWSTA) {
             this.eventHandler.start(status !== STATUS_TWI_IDLE);
           } else if (value & TWCR_TWSTO) {
@@ -129,19 +127,12 @@ export class AVRTWI {
             const ack = !!(value & TWCR_TWEA);
             this.eventHandler.readByte(ack);
           }
-        };
+        }, 0);
         return true;
       }
     };
   }
 
-  tick() {
-    if (this.nextTick) {
-      this.nextTick();
-      this.nextTick = null;
-    }
-  }
-
   get prescaler() {
     switch (this.cpu.data[this.config.TWSR] & TWSR_TWPS_MASK) {
       case 0: