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Apply minor optimizations to planner.cpp

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This commit is contained in:
Scott Lahteine 2016-10-11 02:01:20 -05:00
parent 1092319b19
commit 4d89652bc2
1 changed files with 11 additions and 12 deletions
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21
Marlin/planner.cpp
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@ -145,6 +145,8 @@ void Planner::init() {
#endif
}
#define MINIMAL_STEP_RATE 120
/**
* Calculate trapezoid parameters, multiplying the entry- and exit-speeds
* by the provided factors.
@ -154,8 +156,8 @@ void Planner::calculate_trapezoid_for_block(block_t* const block, const float &e
final_rate = ceil(block->nominal_rate * exit_factor); // (steps per second)
// Limit minimal step rate (Otherwise the timer will overflow.)
NOLESS(initial_rate, 120);
NOLESS(final_rate, 120);
NOLESS(initial_rate, MINIMAL_STEP_RATE);
NOLESS(final_rate, MINIMAL_STEP_RATE);
int32_t accel = block->acceleration_steps_per_s2,
accelerate_steps = ceil(estimate_acceleration_distance(initial_rate, block->nominal_rate, accel)),
@ -172,13 +174,9 @@ void Planner::calculate_trapezoid_for_block(block_t* const block, const float &e
plateau_steps = 0;
}
#if ENABLED(ADVANCE)
volatile int32_t initial_advance = block->advance * sq(entry_factor),
final_advance = block->advance * sq(exit_factor);
#endif // ADVANCE
// block->accelerate_until = accelerate_steps;
// block->decelerate_after = accelerate_steps+plateau_steps;
CRITICAL_SECTION_START; // Fill variables used by the stepper in a critical section
if (!block->busy) { // Don't update variables if block is busy.
block->accelerate_until = accelerate_steps;
@ -186,8 +184,8 @@ void Planner::calculate_trapezoid_for_block(block_t* const block, const float &e
block->initial_rate = initial_rate;
block->final_rate = final_rate;
#if ENABLED(ADVANCE)
block->initial_advance = initial_advance;
block->final_advance = final_advance;
block->initial_advance = block->advance * sq(entry_factor);
block->final_advance = block->advance * sq(exit_factor);
#endif
}
CRITICAL_SECTION_END;
@ -230,9 +228,10 @@ void Planner::reverse_pass() {
block_t* block[3] = { NULL, NULL, NULL };
// Make a local copy of block_buffer_tail, because the interrupt can alter it
CRITICAL_SECTION_START;
// Is a critical section REALLY needed for a single byte change?
//CRITICAL_SECTION_START;
uint8_t tail = block_buffer_tail;
CRITICAL_SECTION_END
//CRITICAL_SECTION_END
uint8_t b = BLOCK_MOD(block_buffer_head - 3);
while (b != tail) {