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neopixel.cpp
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neopixel.cpp
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/*-------------------------------------------------------------------------
Particle Core, Particle Photon, P1, Electron, Argon, Boron, Xenon and
RedBear Duo library to control WS2811/WS2812/WS2813 based RGB LED
devices such as Adafruit NeoPixel strips.
Supports:
- 800 KHz WS2812, WS2812B, WS2813 and 400kHz bitstream and WS2811
- 800 KHz bitstream SK6812RGBW (NeoPixel RGBW pixel strips)
(use 'SK6812RGBW' as PIXEL_TYPE)
Also supports:
- Radio Shack Tri-Color Strip with TM1803 controller 400kHz bitstream.
- TM1829 pixels
PLEASE NOTE that the NeoPixels require 5V level inputs
and the supported microcontrollers only have 3.3V level outputs. Level
shifting is necessary, but will require a fast device such as one of
the following:
[SN74HCT125N]
http://www.digikey.com/product-detail/en/SN74HCT125N/296-8386-5-ND/376860
[SN74HCT245N]
http://www.digikey.com/product-detail/en/SN74HCT245N/296-1612-5-ND/277258
Written by Phil Burgess / Paint Your Dragon for Adafruit Industries.
Modified to work with Particle devices by Technobly.
Contributions by PJRC and other members of the open source community.
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing products
from Adafruit!
--------------------------------------------------------------------*/
/* ======================= neopixel.cpp ======================= */
/*-------------------------------------------------------------------------
This file is part of the Adafruit NeoPixel library.
NeoPixel is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
NeoPixel is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with NeoPixel. If not, see
<http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------*/
#include "neopixel.h"
#if PLATFORM_ID == 0 // Core (0)
#define pinLO(_pin) (PIN_MAP[_pin].gpio_peripheral->BRR = PIN_MAP[_pin].gpio_pin)
#define pinHI(_pin) (PIN_MAP[_pin].gpio_peripheral->BSRR = PIN_MAP[_pin].gpio_pin)
#elif (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
STM32_Pin_Info* PIN_MAP2 = HAL_Pin_Map(); // Pointer required for highest access speed
#define pinLO(_pin) (PIN_MAP2[_pin].gpio_peripheral->BSRRH = PIN_MAP2[_pin].gpio_pin)
#define pinHI(_pin) (PIN_MAP2[_pin].gpio_peripheral->BSRRL = PIN_MAP2[_pin].gpio_pin)
#elif (PLATFORM_ID == 12) || (PLATFORM_ID == 13) || (PLATFORM_ID == 14) // Argon (12), Boron (13), Xenon (14)
#include "nrf.h"
#include "nrf_gpio.h"
#include "pinmap_impl.h"
NRF5x_Pin_Info* PIN_MAP2 = HAL_Pin_Map();
#define pinLO(_pin) (nrf_gpio_pin_clear(NRF_GPIO_PIN_MAP(PIN_MAP2[_pin].gpio_port, PIN_MAP2[_pin].gpio_pin)))
#define pinHI(_pin) (nrf_gpio_pin_set(NRF_GPIO_PIN_MAP(PIN_MAP2[_pin].gpio_port, PIN_MAP2[_pin].gpio_pin)))
#else
#error "*** PLATFORM_ID not supported by this library. PLATFORM should be Particle Core, Photon, Electron, Argon, Boron, Xenon and RedBear Duo ***"
#endif
// fast pin access
#define pinSet(_pin, _hilo) (_hilo ? pinHI(_pin) : pinLO(_pin))
Adafruit_NeoPixel::Adafruit_NeoPixel(uint16_t n, uint8_t p, uint8_t t) :
begun(false), type(t), brightness(0), pixels(NULL), endTime(0)
{
updateLength(n);
setPin(p);
}
Adafruit_NeoPixel::~Adafruit_NeoPixel() {
if (pixels) free(pixels);
if (begun) pinMode(pin, INPUT);
}
void Adafruit_NeoPixel::updateLength(uint16_t n) {
if (pixels) free(pixels); // Free existing data (if any)
// Allocate new data -- note: ALL PIXELS ARE CLEARED
numBytes = n * ((type == SK6812RGBW) ? 4 : 3);
if ((pixels = (uint8_t *)malloc(numBytes))) {
memset(pixels, 0, numBytes);
numLEDs = n;
} else {
numLEDs = numBytes = 0;
}
}
void Adafruit_NeoPixel::begin(void) {
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
begun = true;
}
// Set the output pin number
void Adafruit_NeoPixel::setPin(uint8_t p) {
if (begun) {
pinMode(pin, INPUT);
}
pin = p;
if (begun) {
pinMode(p, OUTPUT);
digitalWrite(p, LOW);
}
}
void Adafruit_NeoPixel::show(void) {
if(!pixels) return;
// Data latch = 24 or 50 microsecond pause in the output stream. Rather than
// put a delay at the end of the function, the ending time is noted and
// the function will simply hold off (if needed) on issuing the
// subsequent round of data until the latch time has elapsed. This
// allows the mainline code to start generating the next frame of data
// rather than stalling for the latch.
uint32_t wait_time; // wait time in microseconds.
switch(type) {
case TM1803: { // TM1803 = 24us reset pulse
wait_time = 24L;
} break;
case SK6812RGBW: { // SK6812RGBW = 80us reset pulse
wait_time = 80L;
} break;
case TM1829: { // TM1829 = 500us reset pulse
wait_time = 500L;
} break;
case WS2812B: // WS2812, WS2812B & WS2813 = 300us reset pulse
case WS2812B2: {
wait_time = 300L;
} break;
case WS2811: // WS2811, WS2812B_FAST & WS2812B2_FAST = 50us reset pulse
case WS2812B_FAST:
case WS2812B2_FAST:
default: { // default = 50us reset pulse
wait_time = 50L;
} break;
}
while((micros() - endTime) < wait_time);
// endTime is a private member (rather than global var) so that multiple
// instances on different pins can be quickly issued in succession (each
// instance doesn't delay the next).
#if (PLATFORM_ID == 0) || (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Core (0), Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
__disable_irq(); // Need 100% focus on instruction timing
volatile uint32_t
c, // 24-bit/32-bit pixel color
mask; // 1-bit mask
volatile uint16_t i = numBytes; // Output loop counter
volatile uint8_t
j, // 8-bit inner loop counter
*ptr = pixels, // Pointer to next byte
g, // Current green byte value
r, // Current red byte value
b, // Current blue byte value
w; // Current white byte value
if(type == WS2812B || type == WS2812B_FAST) { // Same as WS2812 & WS2813, 800 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
g = *ptr++; // Next green byte value
r = *ptr++; // Next red byte value
b = *ptr++; // Next blue byte value
c = ((uint32_t)g << 16) | ((uint32_t)r << 8) | b; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
do {
pinSet(pin, HIGH); // HIGH
if (c & mask) { // if masked bit is high
// WS2812 spec 700ns HIGH
// Adafruit on Arduino (meas. 812ns)
// This lib on Spark Core (meas. 804ns)
// This lib on Photon (meas. 792ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
// WS2812 spec 600ns LOW
// Adafruit on Arduino (meas. 436ns)
// This lib on Spark Core (meas. 446ns)
// This lib on Photon (meas. 434ns)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
else { // else masked bit is low
// WS2812 spec 350ns HIGH
// Adafruit on Arduino (meas. 312ns)
// This lib on Spark Core (meas. 318ns)
// This lib on Photon (meas. 308ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
// WS2812 spec 800ns LOW
// Adafruit on Arduino (meas. 938ns)
// This lib on Spark Core (meas. 944ns)
// This lib on Photon (meas. 936ns)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
mask >>= 1;
} while ( ++j < 24 ); // ... pixel done
} // end while(i) ... no more pixels
}
else if(type == SK6812RGBW) { // similar to WS2812, 800 KHz bitstream but with RGB+W components
while(i) { // While bytes left... (4 bytes = 1 pixel)
mask = 0x80000000; // reset the mask
i = i-4; // decrement bytes remaining
r = *ptr++; // Next red byte value
g = *ptr++; // Next green byte value
b = *ptr++; // Next blue byte value
w = *ptr++; // Next white byte value
c = ((uint32_t)r << 24) | ((uint32_t)g << 16) | ((uint32_t)b << 8) | w; // Pack the next 4 bytes to keep timing tight
j = 0; // reset the 32-bit counter
do {
pinSet(pin, HIGH); // HIGH
if (c & mask) { // if masked bit is high
// SK6812RGBW spec 600ns HIGH
// WS2812 spec 700ns HIGH
// Adafruit on Arduino (meas. 812ns)
// This lib on Spark Core (meas. 610ns)
// This lib on Photon (meas. 608ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
// SK6812RGBW spec 600ns LOW
// WS2812 spec 600ns LOW
// Adafruit on Arduino (meas. 436ns)
// This lib on Spark Core (meas. 598ns)
// This lib on Photon (meas. 600ns)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
else { // else masked bit is low
// SK6812RGBW spec 300ns HIGH
// WS2812 spec 350ns HIGH
// Adafruit on Arduino (meas. 312ns)
// This lib on Spark Core (meas. 305ns)
// This lib on Photon (meas. 308ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
// SK6812RGBW spec 900ns LOW
// WS2812 spec 800ns LOW
// Adafruit on Arduino (meas. 938ns)
// This lib on Spark Core (meas. 904ns)
// This lib on Photon (meas. 900ns)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
mask >>= 1;
} while ( ++j < 32 ); // ... pixel done
} // end while(i) ... no more pixels
}
else if(type == WS2812B2 || type == WS2812B2_FAST) { // WS2812B with DWT timer
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
#define CYCLES_800_T0H 25 // 312ns (meas. 300ns)
#define CYCLES_800_T0L 70 // 938ns (meas. 940ns)
#define CYCLES_800_T1H 80 // 812ns (meas. 792ns)
#define CYCLES_800_T1L 8 // 436ns (meas. 425ns)
volatile uint32_t cyc;
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
g = *ptr++; // Next green byte value
r = *ptr++; // Next red byte value
b = *ptr++; // Next blue byte value
c = ((uint32_t)g << 16) | ((uint32_t)r << 8) | b; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
do {
cyc = DWT->CYCCNT;
pinSet(pin, HIGH); // HIGH
if (c & mask) { // if masked bit is high
while(DWT->CYCCNT - cyc < CYCLES_800_T1H);
pinSet(pin, LOW);
cyc = DWT->CYCCNT;
while(DWT->CYCCNT - cyc < CYCLES_800_T1L);
}
else { // else masked bit is low
while(DWT->CYCCNT - cyc < CYCLES_800_T0H);
pinSet(pin, LOW);
cyc = DWT->CYCCNT;
while(DWT->CYCCNT - cyc < CYCLES_800_T0L);
}
mask >>= 1;
} while ( ++j < 24 ); // ... pixel done
} // end while(i) ... no more pixels
#endif
}
else if(type == WS2811) { // WS2811, 400 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
r = *ptr++; // Next red byte value
g = *ptr++; // Next green byte value
b = *ptr++; // Next blue byte value
c = ((uint32_t)r << 16) | ((uint32_t)g << 8) | b; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
do {
pinSet(pin, HIGH); // HIGH
if (c & mask) { // if masked bit is high
// WS2811 spec 1.20us HIGH
// Adafruit on Arduino (meas. 1.25us)
// This lib on Spark Core (meas. 1.25us)
// This lib on Photon (meas. 1.25us)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
// WS2811 spec 1.30us LOW
// Adafruit on Arduino (meas. 1.25us)
// This lib on Spark Core (meas. 1.24us)
// This lib on Photon (meas. 1.24us)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
else { // else masked bit is low
// WS2811 spec 500ns HIGH
// Adafruit on Arduino (meas. 500ns)
// This lib on Spark Core (meas. 500ns)
// This lib on Photon (meas. 500ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#endif
"nop" "\n\t" "nop" "\n\t"
::: "r0", "cc", "memory");
// WS2811 spec 2.000us LOW
// Adafruit on Arduino (meas. 2.000us)
// This lib on Spark Core (meas. 2.000us)
// This lib on Photon (meas. 2.000us)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
mask >>= 1;
} while ( ++j < 24 ); // ... pixel done
} // end while(i) ... no more pixels
}
else if(type == TM1803) { // TM1803 (Radio Shack Tri-Color Strip), 400 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
r = *ptr++; // Next red byte value
g = *ptr++; // Next blue byte value
b = *ptr++; // Next green byte value
c = ((uint32_t)r << 16) | ((uint32_t)g << 8) | b; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
do {
pinSet(pin, HIGH); // HIGH
if (c & mask) { // if masked bit is high
// TM1803 spec 1.36us HIGH
// Pololu on Arduino (meas. 1.31us)
// This lib on Spark Core (meas. 1.36us)
// This lib on Photon (meas. 1.36us)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
// TM1803 spec 680ns LOW
// Pololu on Arduino (meas. 1.024us)
// This lib on Spark Core (meas. 680ns)
// This lib on Photon (meas. 684ns)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
else { // else masked bit is low
// TM1803 spec 680ns HIGH
// Pololu on Arduino (meas. 374ns)
// This lib on Spark Core (meas. 680ns)
// This lib on Photon (meas. 684ns)
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
// TM1803 spec 1.36us LOW
// Pololu on Arduino (meas. 2.00us)
// This lib on Spark Core (meas. 1.36us)
// This lib on Photon (meas. 1.36us)
pinSet(pin, LOW); // LOW
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
}
mask >>= 1;
} while ( ++j < 24 ); // ... pixel done
} // end while(i) ... no more pixels
}
else { // must be only other option TM1829, 800 KHz bitstream
while(i) { // While bytes left... (3 bytes = 1 pixel)
mask = 0x800000; // reset the mask
i = i-3; // decrement bytes remaining
r = *ptr++; // Next red byte value
b = *ptr++; // Next blue byte value
g = *ptr++; // Next green byte value
c = ((uint32_t)r << 16) | ((uint32_t)b << 8) | g; // Pack the next 3 bytes to keep timing tight
j = 0; // reset the 24-bit counter
pinSet(pin, LOW); // LOW
for( ;; ) { // ... pixel done
if (c & mask) { // if masked bit is high
// TM1829 spec 800ns LOW
// This lib on Spark Core (meas. 806ns)
// This lib on Photon (meas. 792ns)
mask >>= 1; // Do this task during the long delay of this bit
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
j++;
// TM1829 spec 300ns HIGH
// This lib on Spark Core (meas. 305ns)
// This lib on Photon (meas. 300ns)
pinSet(pin, HIGH); // HIGH
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
#endif
::: "r0", "cc", "memory");
if(j==24) break;
pinSet(pin, LOW); // LOW
}
else { // else masked bit is low
// TM1829 spec 300ns LOW
// This lib on Spark Core (meas. 390ns)
// This lib on Photon (meas. 300ns)
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
asm volatile(
"mov r0, r0" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t"
::: "r0", "cc", "memory");
#endif
// TM1829 spec 800ns HIGH
// This lib on Spark Core (meas. 792ns)
// This lib on Photon (meas. 800ns)
pinSet(pin, HIGH); // HIGH
j++;
mask >>= 1; // Do this task during the long delay of this bit
asm volatile(
"mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#if (PLATFORM_ID == 6) || (PLATFORM_ID == 8) || (PLATFORM_ID == 10) || (PLATFORM_ID == 88) // Photon (6), P1 (8), Electron (10) or Redbear Duo (88)
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
"nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t"
#endif
::: "r0", "cc", "memory");
if(j==24) break;
pinSet(pin, LOW); // LOW
}
}
} // end while(i) ... no more pixels
}
__enable_irq();
#elif (PLATFORM_ID == 12) || (PLATFORM_ID == 13) || (PLATFORM_ID == 14) // Argon (12), Boron (13), Xenon (14)
// [[[Begin of the Neopixel NRF52 EasyDMA implementation
// by the Hackerspace San Salvador]]]
// This technique uses the PWM peripheral on the NRF52. The PWM uses the
// EasyDMA feature included on the chip. This technique loads the duty
// cycle configuration for each cycle when the PWM is enabled. For this
// to work we need to store a 16 bit configuration for each bit of the
// RGB(W) values in the pixel buffer.
// Comparator values for the PWM were hand picked and are guaranteed to
// be 100% organic to preserve freshness and high accuracy. Current
// parameters are:
// * PWM Clock: 16Mhz
// * Minimum step time: 62.5ns
// * Time for zero in high (T0H): 0.31ms
// * Time for one in high (T1H): 0.75ms
// * Cycle time: 1.25us
// * Frequency: 800Khz
// For 400Khz we just double the calculated times.
// ---------- BEGIN Constants for the EasyDMA implementation -----------
// The PWM starts the duty cycle in LOW. To start with HIGH we
// need to set the 15th bit on each register.
// WS2812 (rev A) timing is 0.35 and 0.7us
//#define MAGIC_T0H 5UL | (0x8000) // 0.3125us
//#define MAGIC_T1H 12UL | (0x8000) // 0.75us
// WS2812B (rev B) timing is 0.4 and 0.8 us
#define MAGIC_T0H 6UL | (0x8000) // 0.375us
#define MAGIC_T1H 13UL | (0x8000) // 0.8125us
// WS2811 (400 khz) timing is 0.5 and 1.2
#define MAGIC_T0H_400KHz 8UL | (0x8000) // 0.5us
#define MAGIC_T1H_400KHz 19UL | (0x8000) // 1.1875us
// For 400Khz, we double value of CTOPVAL
#define CTOPVAL 20UL // 1.25us
#define CTOPVAL_400KHz 40UL // 2.5us
// ---------- END Constants for the EasyDMA implementation -------------
//
// If there is no device available an alternative cycle-counter
// implementation is tried.
// The nRF52832 runs with a fixed clock of 64Mhz. The alternative
// implementation is the same as the one used for the Teensy 3.0/1/2 but
// with the Nordic SDK HAL & registers syntax.
// The number of cycles was hand picked and is guaranteed to be 100%
// organic to preserve freshness and high accuracy.
// ---------- BEGIN Constants for cycle counter implementation ---------
#define CYCLES_800_T0H 18 // ~0.36 uS
#define CYCLES_800_T1H 41 // ~0.76 uS
#define CYCLES_800 71 // ~1.25 uS
#define CYCLES_400_T0H 26 // ~0.50 uS
#define CYCLES_400_T1H 70 // ~1.26 uS
#define CYCLES_400 156 // ~2.50 uS
// ---------- END of Constants for cycle counter implementation --------
// To support both the SoftDevice + Neopixels we use the EasyDMA
// feature from the NRF25. However this technique implies to
// generate a pattern and store it on the memory. The actual
// memory used in bytes corresponds to the following formula:
// totalMem = numBytes*8*2+(2*2)
// The two additional bytes at the end are needed to reset the
// sequence.
//
// If there is not enough memory, we will fall back to cycle counter
// using DWT
uint32_t pattern_size = numBytes*8*sizeof(uint16_t)+2*sizeof(uint16_t);
uint16_t* pixels_pattern = NULL;
NRF_PWM_Type* pwm = NULL;
// Try to find a free PWM device, which is not enabled
// and has no connected pins
NRF_PWM_Type* PWM[3] = {NRF_PWM0, NRF_PWM1, NRF_PWM2};
for(int device = 0; device<3; device++) {
if( (PWM[device]->ENABLE == 0) &&
(PWM[device]->PSEL.OUT[0] & PWM_PSEL_OUT_CONNECT_Msk) &&
(PWM[device]->PSEL.OUT[1] & PWM_PSEL_OUT_CONNECT_Msk) &&
(PWM[device]->PSEL.OUT[2] & PWM_PSEL_OUT_CONNECT_Msk) &&
(PWM[device]->PSEL.OUT[3] & PWM_PSEL_OUT_CONNECT_Msk)
) {
pwm = PWM[device];
break;
}
}
// only malloc if there is PWM device available
if ( pwm != NULL ) {
#ifdef ARDUINO_FEATHER52 // use thread-safe malloc
pixels_pattern = (uint16_t *) rtos_malloc(pattern_size);
#else
pixels_pattern = (uint16_t *) malloc(pattern_size);
#endif
}
// Use the identified device to choose the implementation
// If a PWM device is available use DMA
if( (pixels_pattern != NULL) && (pwm != NULL) ) {
uint16_t pos = 0; // bit position
for(uint16_t n=0; n<numBytes; n++) {
uint8_t pix = pixels[n];
for(uint8_t mask=0x80, i=0; mask>0; mask >>= 1, i++) {
#ifdef NEO_KHZ400
if( !is800KHz ) {
pixels_pattern[pos] = (pix & mask) ? MAGIC_T1H_400KHz : MAGIC_T0H_400KHz;
}else
#endif
{
pixels_pattern[pos] = (pix & mask) ? MAGIC_T1H : MAGIC_T0H;
}
pos++;
}
}
// Zero padding to indicate the end of que sequence
pixels_pattern[++pos] = 0 | (0x8000); // Seq end
pixels_pattern[++pos] = 0 | (0x8000); // Seq end
// Set the wave mode to count UP
pwm->MODE = (PWM_MODE_UPDOWN_Up << PWM_MODE_UPDOWN_Pos);
// Set the PWM to use the 16MHz clock
pwm->PRESCALER = (PWM_PRESCALER_PRESCALER_DIV_1 << PWM_PRESCALER_PRESCALER_Pos);
// Setting of the maximum count
// but keeping it on 16Mhz allows for more granularity just
// in case someone wants to do more fine-tuning of the timing.
#ifdef NEO_KHZ400
if( !is800KHz ) {
pwm->COUNTERTOP = (CTOPVAL_400KHz << PWM_COUNTERTOP_COUNTERTOP_Pos);
}else
#endif
{
pwm->COUNTERTOP = (CTOPVAL << PWM_COUNTERTOP_COUNTERTOP_Pos);
}
// Disable loops, we want the sequence to repeat only once
pwm->LOOP = (PWM_LOOP_CNT_Disabled << PWM_LOOP_CNT_Pos);
// On the "Common" setting the PWM uses the same pattern for the
// for supported sequences. The pattern is stored on half-word
// of 16bits
pwm->DECODER = (PWM_DECODER_LOAD_Common << PWM_DECODER_LOAD_Pos) |
(PWM_DECODER_MODE_RefreshCount << PWM_DECODER_MODE_Pos);
// Pointer to the memory storing the patter
pwm->SEQ[0].PTR = (uint32_t)(pixels_pattern) << PWM_SEQ_PTR_PTR_Pos;
// Calculation of the number of steps loaded from memory.
pwm->SEQ[0].CNT = (pattern_size/sizeof(uint16_t)) << PWM_SEQ_CNT_CNT_Pos;
// The following settings are ignored with the current config.
pwm->SEQ[0].REFRESH = 0;
pwm->SEQ[0].ENDDELAY = 0;
// The Neopixel implementation is a blocking algorithm. DMA
// allows for non-blocking operation. To "simulate" a blocking
// operation we enable the interruption for the end of sequence
// and block the execution thread until the event flag is set by
// the peripheral.
// pwm->INTEN |= (PWM_INTEN_SEQEND0_Enabled<<PWM_INTEN_SEQEND0_Pos);
// PSEL must be configured before enabling PWM
pwm->PSEL.OUT[0] = NRF_GPIO_PIN_MAP(PIN_MAP2[pin].gpio_port, PIN_MAP2[pin].gpio_pin);
// Enable the PWM
pwm->ENABLE = 1;
// After all of this and many hours of reading the documentation
// we are ready to start the sequence...
pwm->EVENTS_SEQEND[0] = 0;
pwm->TASKS_SEQSTART[0] = 1;
// But we have to wait for the flag to be set.
while(!pwm->EVENTS_SEQEND[0])
{
#ifdef ARDUINO_FEATHER52
yield();
#endif
}
// Before leave we clear the flag for the event.
pwm->EVENTS_SEQEND[0] = 0;
// We need to disable the device and disconnect
// all the outputs before leave or the device will not
// be selected on the next call.
// TODO: Check if disabling the device causes performance issues.
pwm->ENABLE = 0;
pwm->PSEL.OUT[0] = 0xFFFFFFFFUL;
#ifdef ARDUINO_FEATHER52 // use thread-safe free
rtos_free(pixels_pattern);
#else
free(pixels_pattern);
#endif