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neopixel: Use names for key timing values 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2020-04-15 12:11:57 -04:00
parent c7d6d81a4d
commit a7f7cc5075
1 changed files with 19 additions and 12 deletions
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31
src/neopixel.c
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@ -36,9 +36,10 @@ nsecs_to_ticks(uint32_t ns)
}
static inline int
neopixel_check_elapsed(neopixel_time_t t1, neopixel_time_t t2, uint32_t nsecs)
neopixel_check_elapsed(neopixel_time_t t1, neopixel_time_t t2
, neopixel_time_t ticks)
{
return t2 - t1 >= nsecs_to_ticks(nsecs);
return t2 - t1 >= ticks;
}
// The AVR micro-controllers require specialized timing
@ -53,7 +54,7 @@ neopixel_get_time(void)
}
static inline void
neopixel_delay(neopixel_time_t start, uint32_t nsecs)
neopixel_delay(neopixel_time_t start, neopixel_time_t ticks)
{
}
@ -66,14 +67,20 @@ neopixel_get_time(void)
}
static inline void
neopixel_delay(neopixel_time_t start, uint32_t nsecs)
neopixel_delay(neopixel_time_t start, neopixel_time_t ticks)
{
while (!neopixel_check_elapsed(start, neopixel_get_time(), nsecs))
while (!neopixel_check_elapsed(start, neopixel_get_time(), ticks))
;
}
#endif
#define PULSE_LONG_TICKS nsecs_to_ticks(650)
#define PULSE_SHORT_TICKS nsecs_to_ticks(200)
#define BIT_MIN_TICKS nsecs_to_ticks(1250)
#define BIT_MAX_TICKS nsecs_to_ticks(4000)
#define RESET_MIN_TICKS timer_from_us(50)
/****************************************************************
* Neopixel interface
@ -99,7 +106,7 @@ send_data(struct neopixel_s *n, uint8_t *data, uint_fast8_t data_len)
{
// Make sure at least 50us has passed since last request
uint32_t last_req_time = n->last_req_time, cur = timer_read_time();
while (cur - last_req_time < timer_from_us(50)) {
while (cur - last_req_time < RESET_MIN_TICKS) {
irq_poll();
cur = timer_read_time();
}
@ -112,32 +119,32 @@ send_data(struct neopixel_s *n, uint8_t *data, uint_fast8_t data_len)
while (bits--) {
if (byte & 0x80) {
// Long pulse
neopixel_delay(last_start, 1250);
neopixel_delay(last_start, BIT_MIN_TICKS);
irq_disable();
neopixel_time_t start = neopixel_get_time();
gpio_out_toggle_noirq(pin);
irq_enable();
if (neopixel_check_elapsed(last_start, start, 4000))
if (neopixel_check_elapsed(last_start, start, BIT_MAX_TICKS))
goto fail;
last_start = start;
byte <<= 1;
neopixel_delay(start, 650);
neopixel_delay(start, PULSE_LONG_TICKS);
irq_disable();
gpio_out_toggle_noirq(pin);
irq_enable();
} else {
// Short pulse
neopixel_delay(last_start, 1250);
neopixel_delay(last_start, BIT_MIN_TICKS);
irq_disable();
neopixel_time_t start = neopixel_get_time();
gpio_out_toggle_noirq(pin);
neopixel_delay(start, 200);
neopixel_delay(start, PULSE_SHORT_TICKS);
gpio_out_toggle_noirq(pin);
irq_enable();
if (neopixel_check_elapsed(last_start, start, 4000))
if (neopixel_check_elapsed(last_start, start, BIT_MAX_TICKS))
goto fail;
last_start = start;
byte <<= 1;