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just need to fix the macro

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This commit is contained in:
Brett Weiland 2023-11-03 18:19:15 -05:00
parent cdf430be43
commit 1f74d8e77c
1 changed files with 61 additions and 23 deletions
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84
software_pwm.c
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@ -23,9 +23,13 @@ static struct pwm_event {
bool enabled;
} events[SOFTPWM_PIN_COUNT + 1];
//if list_insert and list_remove end up being too slow, these have a lot of room for
//optimization. We could do a preprocessor IF/THEN instead of using member offset
//TODO accept pointer instead of actual value
#define LIST_INSERT(new, prev, member) (\
list_insert(&(new.member), &(prev.member), offsetof(struct pwm_event, member)))
list_insert(new->member, prev->member, offsetof(struct pwm_event, member)))
#define LIST_REMOVE(event, member) list_remove((event)->member, offsetof(struct pwm_event, member))
#define EVENT_FROM_MEMBER(member_ptr, member_offset) \
((struct pwm_event *)(char *)member_ptr - member_offset)
@ -36,30 +40,33 @@ static struct pwm_event {
static void list_insert(struct link_pair *new_links, struct link_pair *prev_links, size_t parent_offset) {
new_links->next = prev_links->next;
new_links->prev = EVENT_FROM_MEMBER(prev_links, parent_offset);
MEMBER_FROM_EVENT()->prev =
MEMBER_FROM_EVENT(prev_links->next, parent_offset)->prev =
EVENT_FROM_MEMBER(new_links, parent_offset); //GYAAAAGH
prev_links->next = EVENT_FROM_MEMBER(prev_links, parent_offset);
}
static void list_remove(struct link_pair *event_link, size_t parent_offset) {
event_link->prev
MEMBER_FROM_EVENT(event_link->next, parent_offset)->prev =
EVENT_FROM_MEMBER(event_link->prev, parent_offset);
MEMBER_FROM_EVENT(event_link->prev, parent_offset)->next =
EVENT_FROM_MEMBER(event_link->next, parent_offset);
}
void init_softpwm() {
//this one never moves
events[SOFTPWM_PIN_COUNT].time = 0;
events[SOFTPWM_PIN_COUNT].pins = 0;
events[SOFTPWM_PIN_COUNT].active.next = &events[SOFTPWM_PIN_COUNT];
events[SOFTPWM_PIN_COUNT].active.prev = &events[SOFTPWM_PIN_COUNT];
events[SOFTPWM_PIN_COUNT].enabled = true;
//TODO: move all to zero once init_softpwm tested
for(size_t event_i = 0; event_i < SOFTPWM_PIN_COUNT; event_i++) {
events[0].active.prev = events;
events[0].active.next = events;
events[0].enabled = true;
events[0].pins = 0;
events[0].time = 0;
for(size_t event_i = 1; event_i <= SOFTPWM_PIN_COUNT; event_i++) {
events[event_i].time = event_i;
events[event_i].pins = (1 << (event_i + 1)) - 1;
LIST_INSERT(events[event_i],
events[((int)event_i - 1) % (SOFTPWM_PIN_COUNT + 1)], active);
events[event_i].pins = (1 << event_i) - 1;
LIST_INSERT(&(events[event_i]),
&events[((int)event_i - 1) % (SOFTPWM_PIN_COUNT + 1)], active);
events[event_i].enabled = true;
}
SOFTPWM_DDR = 0xff;
@ -74,16 +81,47 @@ void init_softpwm() {
}
void softpwm_set(uint8_t pin, uint8_t duty) {
/**
struct pwm_event *event_unmoved = &events[pin]; //TODO describe if you want ig
struct pwm_event *this_event = &events[pin];
this_event->time = duty;
if(duty < events[pin].time) {
while(duty < event_unmoved->time) event_unmoved = event_unmoved->next;
struct pwm_event *pin_event = &events[pin + 1];
struct pwm_event *closest_event;
if(duty == pin_event->time) return;
for(closest_event = pin_event; !pin_event->enabled; pin_event = pin_event->twins.next);
if(pin_event->time < duty) {
while(duty > closest_event->time) {
closest_event->time ^= (1 << pin);
closest_event = closest_event->active.prev;
}
}
if(pin_event->time > duty) {
while(duty < closest_event->time) {
closest_event->time |= (1 << pin);
closest_event = closest_event->active.prev;
}
}
//I'm sure I could clean the following a bit
//unlinking
if(pin_event->enabled) {
if(pin_event->twins.next == pin_event) { LIST_REMOVE(pin_event, active); }
else {
//lol
pin_event->active.prev->active.next = pin_event->twins.next;
pin_event->active.next->active.prev = pin_event->twins.next;
pin_event->twins.next->active.prev = pin_event->active.prev;
pin_event->twins.next->active.next = pin_event->active.next;
}
}
else { LIST_REMOVE(pin_event, twins); }
//linking
pin_event->enabled = !(duty == pin_event->time);
if(pin_event->enabled) {
LIST_INSERT(pin_event, closest_event, active);
}
else {
LIST_INSERT(pin_event, closest_event, twins);
}
**/
pin_event->time = duty;
}
/**
@ -94,6 +132,6 @@ ISR(TIMER0_OVF_vect) {
ISR(TIMER0_COMP_vect) {
static struct pwm_event *on_event = &events[SOFTPWM_PIN_COUNT];
SOFTPWM_PORT = on_event->pins;
on_event = on_event->next;
on_event = on_event->active.next;
OCR0A = on_event->time;
}