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Support for GPIO16/D0 #222

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Support for GPIO16/D0 #222

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38 changes: 32 additions & 6 deletions esp8266.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,14 @@ void espShow(
uint8_t pin, uint8_t *pixels, uint32_t numBytes, boolean is800KHz) {
#endif

#ifdef ESP8266
// compensation for if (pin == ...)
// high 400-410ns low 800-810ns period 1300ns 769kHz
#define COMP_CYCLES 3
#else
#define COMP_CYCLES 0
#endif

#define CYCLES_800_T0H (F_CPU / 2500000) // 0.4us
#define CYCLES_800_T1H (F_CPU / 1250000) // 0.8us
#define CYCLES_800 (F_CPU / 800000) // 1.25us per bit
Expand All @@ -44,29 +52,47 @@ void espShow(
#ifdef NEO_KHZ400
if(is800KHz) {
#endif
time0 = CYCLES_800_T0H;
time1 = CYCLES_800_T1H;
time0 = CYCLES_800_T0H - COMP_CYCLES;
time1 = CYCLES_800_T1H - COMP_CYCLES;
period = CYCLES_800;
#ifdef NEO_KHZ400
} else { // 400 KHz bitstream
time0 = CYCLES_400_T0H;
time1 = CYCLES_400_T1H;
time0 = CYCLES_400_T0H - COMP_CYCLES;
time1 = CYCLES_400_T1H - COMP_CYCLES;
period = CYCLES_400;
}
#endif

#ifdef ESP8266
uint32_t gpio_clear = 0;
uint32_t gpio_set = 0;
if (pin == 16) {
// reading and writing RTC_GPIO_OUT is too slow inside the loop
gpio_clear = (READ_PERI_REG(RTC_GPIO_OUT) & (uint32)0xfffffffe);
gpio_set = gpio_clear | 1;
}
#endif

for(t = time0;; t = time0) {
if(pix & mask) t = time1; // Bit high duration
while(((c = _getCycleCount()) - startTime) < period); // Wait for bit start
#ifdef ESP8266
GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinMask); // Set high
if (pin == 16) {
WRITE_PERI_REG(RTC_GPIO_OUT, gpio_set);
} else {
GPIO_REG_WRITE(GPIO_OUT_W1TS_ADDRESS, pinMask); // Set high
}
#else
gpio_set_level(pin, HIGH);
#endif
startTime = c; // Save start time
while(((c = _getCycleCount()) - startTime) < t); // Wait high duration
#ifdef ESP8266
GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinMask); // Set low
if (pin == 16) {
WRITE_PERI_REG(RTC_GPIO_OUT, gpio_clear);
} else {
GPIO_REG_WRITE(GPIO_OUT_W1TC_ADDRESS, pinMask); // Set low
}
#else
gpio_set_level(pin, LOW);
#endif
Expand Down