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>
24 #define I2C_PORT PORTD
26 // Pins to be used in the bit banging
30 #define I2C_DATA_HI()\
31 I2C_DDR &= ~ (1 << I2C_DAT);\
32 I2C_PORT |= (1 << I2C_DAT);
33 #define I2C_DATA_LO()\
34 I2C_DDR |= (1 << I2C_DAT);\
35 I2C_PORT &= ~ (1 << I2C_DAT);
37 #define I2C_CLOCK_HI()\
38 I2C_DDR &= ~ (1 << I2C_CLK);\
39 I2C_PORT |= (1 << I2C_CLK);
40 #define I2C_CLOCK_LO()\
41 I2C_DDR |= (1 << I2C_CLK);\
42 I2C_PORT &= ~ (1 << I2C_CLK);
46 void I2C_WriteBit(unsigned char c)
71 // Inits bitbanging port, must be called before using the functions below
75 I2C_PORT &= ~ ((1 << I2C_DAT) | (1 << I2C_CLK));
83 // Send a START Condition
87 // set both to high at the same time
88 I2C_DDR &= ~ ((1 << I2C_DAT) | (1 << I2C_CLK));
98 // Send a STOP Condition
103 _delay_us(I2C_DELAY);
106 _delay_us(I2C_DELAY);
109 // write a byte to the I2C slave device
111 unsigned char I2C_Write(unsigned char c)
113 for (char i = 0; i < 8; i++)
115 I2C_WriteBit(c & 128);
122 _delay_us(I2C_DELAY);
123 _delay_us(I2C_DELAY);
125 // _delay_us(I2C_DELAY);
126 //return I2C_ReadBit();
133 // Setleds for standard RGB
134 void inline ws2812_setleds(LED_TYPE *ledarray, uint16_t leds)
136 // ws2812_setleds_pin(ledarray,leds, _BV(ws2812_pin));
137 ws2812_setleds_pin(ledarray,leds, _BV(RGB_DI_PIN & 0xF));
140 void inline ws2812_setleds_pin(LED_TYPE *ledarray, uint16_t leds, uint8_t pinmask)
142 // ws2812_DDRREG |= pinmask; // Enable DDR
143 // new universal format (DDR)
144 _SFR_IO8((RGB_DI_PIN >> 4) + 1) |= pinmask;
146 ws2812_sendarray_mask((uint8_t*)ledarray,leds+leds+leds,pinmask);
150 // Setleds for SK6812RGBW
151 void inline ws2812_setleds_rgbw(LED_TYPE *ledarray, uint16_t leds)
155 uint8_t sreg_prev, twcr_prev;
163 uint16_t datlen = leds<<2;
165 uint8_t * data = (uint8_t*)ledarray;
176 // ws2812_DDRREG |= _BV(ws2812_pin); // Enable DDR
177 // new universal format (DDR)
178 _SFR_IO8((RGB_DI_PIN >> 4) + 1) |= _BV(RGB_DI_PIN & 0xF);
180 ws2812_sendarray_mask((uint8_t*)ledarray,leds<<2,_BV(RGB_DI_PIN & 0xF));
188 void ws2812_sendarray(uint8_t *data,uint16_t datlen)
190 ws2812_sendarray_mask(data,datlen,_BV(RGB_DI_PIN & 0xF));
194 This routine writes an array of bytes with RGB values to the Dataout pin
195 using the fast 800kHz clockless WS2811/2812 protocol.
199 #define w_zeropulse 350
200 #define w_onepulse 900
201 #define w_totalperiod 1250
203 // Fixed cycles used by the inner loop
205 #define w_fixedhigh 4
206 #define w_fixedtotal 8
208 // Insert NOPs to match the timing, if possible
209 #define w_zerocycles (((F_CPU/1000)*w_zeropulse )/1000000)
210 #define w_onecycles (((F_CPU/1000)*w_onepulse +500000)/1000000)
211 #define w_totalcycles (((F_CPU/1000)*w_totalperiod +500000)/1000000)
213 // w1 - nops between rising edge and falling edge - low
214 #define w1 (w_zerocycles-w_fixedlow)
215 // w2 nops between fe low and fe high
216 #define w2 (w_onecycles-w_fixedhigh-w1)
217 // w3 nops to complete loop
218 #define w3 (w_totalcycles-w_fixedtotal-w1-w2)
226 // The only critical timing parameter is the minimum pulse length of the "0"
227 // Warn or throw error if this timing can not be met with current F_CPU settings.
228 #define w_lowtime ((w1_nops+w_fixedlow)*1000000)/(F_CPU/1000)
230 #error "Light_ws2812: Sorry, the clock speed is too low. Did you set F_CPU correctly?"
232 #warning "Light_ws2812: The timing is critical and may only work on WS2812B, not on WS2812(S)."
233 #warning "Please consider a higher clockspeed, if possible"
248 #define w_nop1 "nop \n\t"
249 #define w_nop2 "rjmp .+0 \n\t"
250 #define w_nop4 w_nop2 w_nop2
251 #define w_nop8 w_nop4 w_nop4
252 #define w_nop16 w_nop8 w_nop8
254 void inline ws2812_sendarray_mask(uint8_t *data,uint16_t datlen,uint8_t maskhi)
256 uint8_t curbyte,ctr,masklo;
259 // masklo =~maskhi&ws2812_PORTREG;
260 // maskhi |= ws2812_PORTREG;
261 masklo =~maskhi&_SFR_IO8((RGB_DI_PIN >> 4) + 2);
262 maskhi |= _SFR_IO8((RGB_DI_PIN >> 4) + 2);
272 " out %2,%3 \n\t" // '1' [01] '0' [01] - re
288 " sbrs %1,7 \n\t" // '1' [03] '0' [02]
289 " out %2,%4 \n\t" // '1' [--] '0' [03] - fe-low
290 " lsl %1 \n\t" // '1' [04] '0' [04]
306 " out %2,%4 \n\t" // '1' [+1] '0' [+1] - fe-high
323 " dec %0 \n\t" // '1' [+2] '0' [+2]
324 " brne loop%=\n\t" // '1' [+3] '0' [+4]
326 : "r" (curbyte), "I" (_SFR_IO_ADDR(_SFR_IO8((RGB_DI_PIN >> 4) + 2))), "r" (maskhi), "r" (masklo)