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Add HAL_timer_start for AVR, use stepper timer to time pulses

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Scott Lahteine
2018-06-03 01:43:00 -05:00
parent e970e429b6
commit 3701869e6c
4 changed files with 41 additions and 36 deletions
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35
Marlin/src/HAL/HAL_AVR/HAL.h
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@ -124,7 +124,7 @@ extern "C" {
#define STEP_TIMER_NUM 1
#define TEMP_TIMER_NUM 0
#define PULSE_TIMER_NUM TEMP_TIMER_NUM
#define PULSE_TIMER_NUM STEP_TIMER_NUM
#define HAL_STEPPER_TIMER_RATE HAL_TIMER_RATE
#define HAL_TICKS_PER_US ((HAL_STEPPER_TIMER_RATE) / 1000000) // Cannot be of type double
@ -139,7 +139,7 @@ extern "C" {
#define TIMER_OCR_0 OCR0A
#define TIMER_COUNTER_0 TCNT0
#define PULSE_TIMER_PRESCALE 8
#define PULSE_TIMER_PRESCALE STEPPER_TIMER_PRESCALE
#define ENABLE_STEPPER_DRIVER_INTERRUPT() SBI(TIMSK1, OCIE1A)
#define DISABLE_STEPPER_DRIVER_INTERRUPT() CBI(TIMSK1, OCIE1A)
@ -149,7 +149,36 @@ extern "C" {
#define DISABLE_TEMPERATURE_INTERRUPT() CBI(TIMSK0, OCIE0B)
#define TEMPERATURE_ISR_ENABLED() TEST(TIMSK0, OCIE0B)
#define HAL_timer_start(timer_num, frequency)
FORCE_INLINE void HAL_timer_start(const uint8_t timer_num, const uint32_t frequency) {
UNUSED(frequency);
switch (timer_num) {
case STEP_TIMER_NUM:
// 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
// (F_CPU) / (STEPPER_TIMER_PRESCALE) / frequency
OCR1A = 0x4000;
TCNT1 = 0;
break;
case TEMP_TIMER_NUM:
// Use timer0 for temperature measurement
// Interleave temperature interrupt with millies interrupt
OCR0B = 128;
break;
}
}
#define _CAT(a, ...) a ## __VA_ARGS__
#define HAL_timer_set_compare(timer, compare) (_CAT(TIMER_OCR_, timer) = compare)