diff --git a/WS2812.cpp b/WS2812.cpp new file mode 100644 index 00000000..1d7f87bc --- /dev/null +++ b/WS2812.cpp @@ -0,0 +1,100 @@ +/* +* light weight WS2812 lib V2.1 - Arduino support +* +* Controls WS2811/WS2812/WS2812B RGB-LEDs +* Author: Matthias Riegler +* +* Mar 07 2014: Added Arduino and C++ Library +* +* September 6, 2014: Added option to switch between most popular color orders +* (RGB, GRB, and BRG) -- Windell H. Oskay +* +* License: GNU GPL v2 (see License.txt) +*/ + +#include "WS2812.h" +#include + +WS2812::WS2812(uint16_t num_leds) { + count_led = num_leds; + + pixels = (uint8_t*)malloc(count_led*3); + offsetGreen = 0; + offsetRed = 1; + offsetBlue = 2; +} + +cRGB WS2812::get_crgb_at(uint16_t index) { + + cRGB px_value; + + if(index < count_led) { + + uint16_t tmp; + tmp = index * 3; + + px_value.r = pixels[tmp+offsetRed]; + px_value.g = pixels[tmp+offsetGreen]; + px_value.b = pixels[tmp+offsetBlue]; + } + + return px_value; +} + +uint8_t WS2812::set_crgb_at(uint16_t index, cRGB px_value) { + + if(index < count_led) { + + uint16_t tmp; + tmp = index * 3; + + pixels[tmp+offsetGreen] = px_value.g; + pixels[tmp+offsetRed] = px_value.r; + pixels[tmp+offsetBlue] = px_value.b; + + return 0; + } + return 1; +} + +void WS2812::sync() { + *ws2812_port_reg |= pinMask; // Enable DDR + ws2812_sendarray_mask(pixels,3*count_led,pinMask,(uint8_t*) ws2812_port,(uint8_t*) ws2812_port_reg ); +} + +void WS2812::setColorOrderGRB() { // Default color order + offsetGreen = 0; + offsetRed = 1; + offsetBlue = 2; +} + +void WS2812::setColorOrderRGB() { + offsetRed = 0; + offsetGreen = 1; + offsetBlue = 2; +} + +void WS2812::setColorOrderBRG() { + offsetBlue = 0; + offsetRed = 1; + offsetGreen = 2; +} + +WS2812::~WS2812() { + + +} + +#ifndef ARDUINO +void WS2812::setOutput(const volatile uint8_t* port, volatile uint8_t* reg, uint8_t pin) { + pinMask = (1< +#include +#ifndef F_CPU +#define F_CPU 16000000UL +#endif +#include +#include + +#ifdef ARDUINO +#if (ARDUINO >= 100) +#include +#else +#include +#include +#endif +#endif + +struct cRGB { uint8_t g; uint8_t r; uint8_t b; }; + +class WS2812 { +public: + WS2812(uint16_t num_led); + ~WS2812(); + + #ifndef ARDUINO + void setOutput(const volatile uint8_t* port, volatile uint8_t* reg, uint8_t pin); + #else + void setOutput(uint8_t pin); + #endif + + cRGB get_crgb_at(uint16_t index); + uint8_t set_crgb_at(uint16_t index, cRGB px_value); + void sync(); + void setColorOrderRGB(); + void setColorOrderGRB(); + void setColorOrderBRG(); + + +private: + uint16_t count_led; + uint8_t *pixels; + uint8_t offsetRed; + uint8_t offsetGreen; + uint8_t offsetBlue; + + void ws2812_sendarray_mask(uint8_t *array,uint16_t length, uint8_t pinmask,uint8_t *port, uint8_t *portreg); + + const volatile uint8_t *ws2812_port; + volatile uint8_t *ws2812_port_reg; + uint8_t pinMask; +}; + + + +#endif /* WS2812_H_ */ \ No newline at end of file diff --git a/light_ws2812.cpp b/light_ws2812.cpp new file mode 100644 index 00000000..2440d231 --- /dev/null +++ b/light_ws2812.cpp @@ -0,0 +1,156 @@ +/* +* light weight WS2812 lib V2.1 - Arduino support +* +* Controls WS2811/WS2812/WS2812B RGB-LEDs +* Author: Tim (cpldcpu@gmail.com) +* +* Jan 18th, 2014 v2.0b Initial Version +* March 7th, 2014 v2.1 Added option to retarget the port register during runtime +* Removes inlining to allow compiling with c++ +* +* License: GNU GPL v2 (see License.txt) +*/ + +#include "WS2812.h" + +/* + This routine writes an array of bytes with RGB values to the Dataout pin + using the fast 800kHz clockless WS2811/2812 protocol. +*/ + +// Timing in ns +#define w_zeropulse 350 +#define w_onepulse 900 +#define w_totalperiod 1250 + +// Fixed cycles used by the inner loop +#define w_fixedlow 3 +#define w_fixedhigh 6 +#define w_fixedtotal 10 + +// Insert NOPs to match the timing, if possible +#define w_zerocycles (((F_CPU/1000)*w_zeropulse )/1000000) +#define w_onecycles (((F_CPU/1000)*w_onepulse +500000)/1000000) +#define w_totalcycles (((F_CPU/1000)*w_totalperiod +500000)/1000000) + +// w1 - nops between rising edge and falling edge - low +#define w1 (w_zerocycles-w_fixedlow) +// w2 nops between fe low and fe high +#define w2 (w_onecycles-w_fixedhigh-w1) +// w3 nops to complete loop +#define w3 (w_totalcycles-w_fixedtotal-w1-w2) + +#if w1>0 + #define w1_nops w1 +#else + #define w1_nops 0 +#endif + +// The only critical timing parameter is the minimum pulse length of the "0" +// Warn or throw error if this timing can not be met with current F_CPU settings. +#define w_lowtime ((w1_nops+w_fixedlow)*1000000)/(F_CPU/1000) +#if w_lowtime>550 + #error "Light_ws2812: Sorry, the clock speed is too low. Did you set F_CPU correctly?" +#elif w_lowtime>450 + #warning "Light_ws2812: The timing is critical and may only work on WS2812B, not on WS2812(S)." + #warning "Please consider a higher clockspeed, if possible" +#endif + +#if w2>0 +#define w2_nops w2 +#else +#define w2_nops 0 +#endif + +#if w3>0 +#define w3_nops w3 +#else +#define w3_nops 0 +#endif + +#define w_nop1 "nop \n\t" +#define w_nop2 "rjmp .+0 \n\t" +#define w_nop4 w_nop2 w_nop2 +#define w_nop8 w_nop4 w_nop4 +#define w_nop16 w_nop8 w_nop8 + +void WS2812::ws2812_sendarray_mask(uint8_t *data,uint16_t datlen,uint8_t maskhi,uint8_t *port, uint8_t *portreg) +{ + uint8_t curbyte,ctr,masklo; + uint8_t sreg_prev; + + masklo = ~maskhi & *port; + maskhi |= *port; + sreg_prev=SREG; + cli(); + + while (datlen--) { + curbyte=*data++; + + asm volatile( + " ldi %0,8 \n\t" + "loop%=: \n\t" + " st X,%3 \n\t" // '1' [02] '0' [02] - re +#if (w1_nops&1) +w_nop1 +#endif +#if (w1_nops&2) +w_nop2 +#endif +#if (w1_nops&4) +w_nop4 +#endif +#if (w1_nops&8) +w_nop8 +#endif +#if (w1_nops&16) +w_nop16 +#endif + " sbrs %1,7 \n\t" // '1' [04] '0' [03] + " st X,%4 \n\t" // '1' [--] '0' [05] - fe-low + " lsl %1 \n\t" // '1' [05] '0' [06] +#if (w2_nops&1) + w_nop1 +#endif +#if (w2_nops&2) + w_nop2 +#endif +#if (w2_nops&4) + w_nop4 +#endif +#if (w2_nops&8) + w_nop8 +#endif +#if (w2_nops&16) + w_nop16 +#endif + " brcc skipone%= \n\t" // '1' [+1] '0' [+2] - + " st X,%4 \n\t" // '1' [+3] '0' [--] - fe-high + "skipone%=: " // '1' [+3] '0' [+2] - + +#if (w3_nops&1) +w_nop1 +#endif +#if (w3_nops&2) +w_nop2 +#endif +#if (w3_nops&4) +w_nop4 +#endif +#if (w3_nops&8) +w_nop8 +#endif +#if (w3_nops&16) +w_nop16 +#endif + + " dec %0 \n\t" // '1' [+4] '0' [+3] + " brne loop%=\n\t" // '1' [+5] '0' [+4] + : "=&d" (ctr) +// : "r" (curbyte), "I" (_SFR_IO_ADDR(ws2812_PORTREG)), "r" (maskhi), "r" (masklo) + : "r" (curbyte), "x" (port), "r" (maskhi), "r" (masklo) + ); + } + + SREG=sreg_prev; +}