Add HAL_timer_start for AVR, use stepper timer to time pulses

Marlin/src/module/stepper.cpp

@@ -1993,27 +1993,8 @@ void Stepper::init() {
     E_AXIS_INIT(4);
   #endif
 
-  #ifdef __AVR__
-    // waveform generation = 0100 = CTC
-    SET_WGM(1, CTC_OCRnA);
-
-    // output mode = 00 (disconnected)
-    SET_COMA(1, NORMAL);
-
-    // Set the timer pre-scaler
-    // Generally we use a divider of 8, resulting in a 2MHz timer
-    // frequency on a 16MHz MCU. If you are going to change this, be
-    // sure to regenerate speed_lookuptable.h with
-    // create_speed_lookuptable.py
-    SET_CS(1, PRESCALER_8);  //  CS 2 = 1/8 prescaler
-
-    // Init Stepper ISR to 122 Hz for quick starting
-    OCR1A = 0x4000;
-    TCNT1 = 0;
-  #else
-    // Init Stepper ISR to 122 Hz for quick starting
-    HAL_timer_start(STEP_TIMER_NUM, 122);
-  #endif
+  // Init Stepper ISR to 122 Hz for quick starting
+  HAL_timer_start(STEP_TIMER_NUM, 122);
 
   ENABLE_STEPPER_DRIVER_INTERRUPT();
 

Marlin/src/module/temperature.cpp

@@ -1234,14 +1234,7 @@ void Temperature::init() {
     HAL_ANALOG_SELECT(FILWIDTH_PIN);
   #endif
 
-  // todo: HAL: fix abstraction
-  #ifdef __AVR__
-    // Use timer0 for temperature measurement
-    // Interleave temperature interrupt with millies interrupt
-    OCR0B = 128;
-  #else
-    HAL_timer_start(TEMP_TIMER_NUM, TEMP_TIMER_FREQUENCY);
-  #endif
+  HAL_timer_start(TEMP_TIMER_NUM, TEMP_TIMER_FREQUENCY);
   ENABLE_TEMPERATURE_INTERRUPT();
 
   #if HAS_AUTO_FAN_0