2 * light weight WS2812 lib V2.0b
4 * Controls WS2811/WS2812/WS2812B RGB-LEDs
5 * Author: Tim (cpldcpu@gmail.com)
7 * Jan 18th, 2014 v2.0b Initial Version
8 * Nov 29th, 2015 v2.3 Added SK6812RGBW support
10 * License: GNU GPL v2 (see License.txt)
13 #include "light_ws2812.h"
14 #include <avr/interrupt.h>
16 #include <util/delay.h>
19 // Setleds for standard RGB
20 void inline ws2812_setleds(struct cRGB *ledarray, uint16_t leds)
22 // ws2812_setleds_pin(ledarray,leds, _BV(ws2812_pin));
23 ws2812_setleds_pin(ledarray,leds, _BV(RGB_DI_PIN & 0xF));
26 void inline ws2812_setleds_pin(struct cRGB *ledarray, uint16_t leds, uint8_t pinmask)
28 // ws2812_DDRREG |= pinmask; // Enable DDR
29 // new universal format (DDR)
30 _SFR_IO8((RGB_DI_PIN >> 4) + 1) |= pinmask;
32 ws2812_sendarray_mask((uint8_t*)ledarray,leds+leds+leds,pinmask);
36 // Setleds for SK6812RGBW
37 void inline ws2812_setleds_rgbw(struct cRGBW *ledarray, uint16_t leds)
39 // ws2812_DDRREG |= _BV(ws2812_pin); // Enable DDR
40 // new universal format (DDR)
41 _SFR_IO8((RGB_DI_PIN >> 4) + 1) |= _BV(RGB_DI_PIN & 0xF);
43 ws2812_sendarray_mask((uint8_t*)ledarray,leds<<2,_BV(RGB_DI_PIN & 0xF));
47 void ws2812_sendarray(uint8_t *data,uint16_t datlen)
49 ws2812_sendarray_mask(data,datlen,_BV(RGB_DI_PIN & 0xF));
53 This routine writes an array of bytes with RGB values to the Dataout pin
54 using the fast 800kHz clockless WS2811/2812 protocol.
58 #define w_zeropulse 350
59 #define w_onepulse 900
60 #define w_totalperiod 1250
62 // Fixed cycles used by the inner loop
65 #define w_fixedtotal 8
67 // Insert NOPs to match the timing, if possible
68 #define w_zerocycles (((F_CPU/1000)*w_zeropulse )/1000000)
69 #define w_onecycles (((F_CPU/1000)*w_onepulse +500000)/1000000)
70 #define w_totalcycles (((F_CPU/1000)*w_totalperiod +500000)/1000000)
72 // w1 - nops between rising edge and falling edge - low
73 #define w1 (w_zerocycles-w_fixedlow)
74 // w2 nops between fe low and fe high
75 #define w2 (w_onecycles-w_fixedhigh-w1)
76 // w3 nops to complete loop
77 #define w3 (w_totalcycles-w_fixedtotal-w1-w2)
85 // The only critical timing parameter is the minimum pulse length of the "0"
86 // Warn or throw error if this timing can not be met with current F_CPU settings.
87 #define w_lowtime ((w1_nops+w_fixedlow)*1000000)/(F_CPU/1000)
89 #error "Light_ws2812: Sorry, the clock speed is too low. Did you set F_CPU correctly?"
91 #warning "Light_ws2812: The timing is critical and may only work on WS2812B, not on WS2812(S)."
92 #warning "Please consider a higher clockspeed, if possible"
107 #define w_nop1 "nop \n\t"
108 #define w_nop2 "rjmp .+0 \n\t"
109 #define w_nop4 w_nop2 w_nop2
110 #define w_nop8 w_nop4 w_nop4
111 #define w_nop16 w_nop8 w_nop8
113 void inline ws2812_sendarray_mask(uint8_t *data,uint16_t datlen,uint8_t maskhi)
115 uint8_t curbyte,ctr,masklo;
118 // masklo =~maskhi&ws2812_PORTREG;
119 // maskhi |= ws2812_PORTREG;
120 masklo =~maskhi&_SFR_IO8((RGB_DI_PIN >> 4) + 2);
121 maskhi |= _SFR_IO8((RGB_DI_PIN >> 4) + 2);
131 " out %2,%3 \n\t" // '1' [01] '0' [01] - re
147 " sbrs %1,7 \n\t" // '1' [03] '0' [02]
148 " out %2,%4 \n\t" // '1' [--] '0' [03] - fe-low
149 " lsl %1 \n\t" // '1' [04] '0' [04]
165 " out %2,%4 \n\t" // '1' [+1] '0' [+1] - fe-high
182 " dec %0 \n\t" // '1' [+2] '0' [+2]
183 " brne loop%=\n\t" // '1' [+3] '0' [+4]
185 : "r" (curbyte), "I" (_SFR_IO_ADDR(_SFR_IO8((RGB_DI_PIN >> 4) + 2))), "r" (maskhi), "r" (masklo)