// planner_recalculate() needs to go over the current plan twice. Once in reverse and once forward. This
// implements the reverse pass.
void planner_reverse_pass() {
uint8_t block_index = block_buffer_head;
//Make a local copy of block_buffer_tail, because the interrupt can alter it
CRITICAL_SECTION_START;
unsigned char tail = block_buffer_tail;
CRITICAL_SECTION_END
if (BLOCK_MOD(block_buffer_head - tail + BLOCK_BUFFER_SIZE) > 3) { // moves queued
block_index = BLOCK_MOD(block_buffer_head - 3);
block_t *block[3] = { NULL, NULL, NULL };
while (block_index != tail) {
block_index = prev_block_index(block_index);
block[2]= block[1];
block[1]= block[0];
block[0] = &block_buffer[block_index];
planner_reverse_pass_kernel(block[0], block[1], block[2]);
}
}
}
/**
* recalculate() needs to go over the current plan twice.
* Once in reverse and once forward. This implements the reverse pass.
*/
void Planner::reverse_pass() {
if (movesplanned() > 3) {
block_t* block[3] = { NULL, NULL, NULL };
// Make a local copy of block_buffer_tail, because the interrupt can alter it
CRITICAL_SECTION_START;
uint8_t tail = block_buffer_tail;
CRITICAL_SECTION_END
uint8_t b = BLOCK_MOD(block_buffer_head - 3);
while (b != tail) {
b = prev_block_index(b);
block[2] = block[1];
block[1] = block[0];
block[0] = &block_buffer[b];
reverse_pass_kernel(block[0], block[1], block[2]);
}
}
}
FORCE_INLINE int8_t prev_block_index(int8_t block_index) { return BLOCK_MOD(block_index - 1); }
// Get the next / previous index of the next block in the ring buffer
// NOTE: Using & here (not %) because BLOCK_BUFFER_SIZE is always a power of 2
FORCE_INLINE int8_t next_block_index(int8_t block_index) { return BLOCK_MOD(block_index + 1); }