summaryrefslogtreecommitdiffstats
path: root/quantum/light_ws2812.c
blob: 497543339b76674f022ed7091f73aa8f7af5d9b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
/*
* light weight WS2812 lib V2.0b
*
* Controls WS2811/WS2812/WS2812B RGB-LEDs
* Author: Tim (cpldcpu@gmail.com)
*
* Jan 18th, 2014  v2.0b Initial Version
* Nov 29th, 2015  v2.3  Added SK6812RGBW support
*
* License: GNU GPL v2 (see License.txt)
*/

#include "light_ws2812.h"
#include <avr/interrupt.h>
#include <avr/io.h>
#include <util/delay.h>
#include "debug.h"

#define RGBW_BB_TWI 1

#ifdef RGBW_BB_TWI

// Port for the I2C
#define I2C_DDR DDRD
#define I2C_PIN PIND
#define I2C_PORT PORTD

// Pins to be used in the bit banging
#define I2C_CLK 0
#define I2C_DAT 1

#define I2C_DATA_HI()\
I2C_DDR &= ~ (1 << I2C_DAT);\
I2C_PORT |= (1 << I2C_DAT);
#define I2C_DATA_LO()\
I2C_DDR |= (1 << I2C_DAT);\
I2C_PORT &= ~ (1 << I2C_DAT);

#define I2C_CLOCK_HI()\
I2C_DDR &= ~ (1 << I2C_CLK);\
I2C_PORT |= (1 << I2C_CLK);
#define I2C_CLOCK_LO()\
I2C_DDR |= (1 << I2C_CLK);\
I2C_PORT &= ~ (1 << I2C_CLK);

#define I2C_DELAY 1

void I2C_WriteBit(unsigned char c)
{
    if (c > 0)
    {
        I2C_DATA_HI();
    }
    else
    {
        I2C_DATA_LO();
    }

    I2C_CLOCK_HI();
    _delay_us(I2C_DELAY);

    I2C_CLOCK_LO();
    _delay_us(I2C_DELAY);

    if (c > 0)
    {
        I2C_DATA_LO();
    }

    _delay_us(I2C_DELAY);
}

// Inits bitbanging port, must be called before using the functions below
//
void I2C_Init()
{
    I2C_PORT &= ~ ((1 << I2C_DAT) | (1 << I2C_CLK));

    I2C_CLOCK_HI();
    I2C_DATA_HI();

    _delay_us(I2C_DELAY);
}

// Send a START Condition
//
void I2C_Start()
{
    // set both to high at the same time
    I2C_DDR &= ~ ((1 << I2C_DAT) | (1 << I2C_CLK));
    _delay_us(I2C_DELAY);

    I2C_DATA_LO();
    _delay_us(I2C_DELAY);

    I2C_CLOCK_LO();
    _delay_us(I2C_DELAY);
}

// Send a STOP Condition
//
void I2C_Stop()
{
    I2C_CLOCK_HI();
    _delay_us(I2C_DELAY);

    I2C_DATA_HI();
    _delay_us(I2C_DELAY);
}

// write a byte to the I2C slave device
//
unsigned char I2C_Write(unsigned char c)
{
    for (char i = 0; i < 8; i++)
    {
        I2C_WriteBit(c & 128);

        c <<= 1;
    }

    
    I2C_WriteBit(0);
    _delay_us(I2C_DELAY);
    _delay_us(I2C_DELAY);
  
    // _delay_us(I2C_DELAY);
    //return I2C_ReadBit();
    return 0;
}


#endif

// Setleds for standard RGB
void inline ws2812_setleds(struct cRGB *ledarray, uint16_t leds)
{
   // ws2812_setleds_pin(ledarray,leds, _BV(ws2812_pin));
   ws2812_setleds_pin(ledarray,leds, _BV(RGB_DI_PIN & 0xF));
}

void inline ws2812_setleds_pin(struct cRGB *ledarray, uint16_t leds, uint8_t pinmask)
{
  // ws2812_DDRREG |= pinmask; // Enable DDR
  // new universal format (DDR)
  _SFR_IO8((RGB_DI_PIN >> 4) + 1) |= pinmask;

  ws2812_sendarray_mask((uint8_t*)ledarray,leds+leds+leds,pinmask);
  _delay_us(50);
}

// Setleds for SK6812RGBW
void inline ws2812_setleds_rgbw(struct cRGBW *ledarray, uint16_t leds)
{

  #ifdef RGBW_BB_TWI
    cli();
    TWCR = 0;
    I2C_Init();
    I2C_Start();
    I2C_Write(0x84);
    uint16_t datlen = leds<<2;
    uint8_t curbyte;
    uint8_t * data = (uint8_t*)ledarray;
    while (datlen--) {
      curbyte=*data++;
      I2C_Write(curbyte);
    }
    I2C_Stop();
    sei();
  #else
    _delay_us(80);
  #endif


  // ws2812_DDRREG |= _BV(ws2812_pin); // Enable DDR
  // new universal format (DDR)
  _SFR_IO8((RGB_DI_PIN >> 4) + 1) |= _BV(RGB_DI_PIN & 0xF);

  ws2812_sendarray_mask((uint8_t*)ledarray,leds<<2,_BV(RGB_DI_PIN & 0xF));



}

void ws2812_sendarray(uint8_t *data,uint16_t datlen)
{
  ws2812_sendarray_mask(data,datlen,_BV(RGB_DI_PIN & 0xF));
}

/*
  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    2
#define w_fixedhigh   4
#define w_fixedtotal  8

// 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 inline ws2812_sendarray_mask(uint8_t *data,uint16_t datlen,uint8_t maskhi)
{
  uint8_t curbyte,ctr,masklo;
  uint8_t sreg_prev;

  // masklo  =~maskhi&ws2812_PORTREG;
  // maskhi |=        ws2812_PORTREG;
  masklo  =~maskhi&_SFR_IO8((RGB_DI_PIN >> 4) + 2);
  maskhi |=        _SFR_IO8((RGB_DI_PIN >> 4) + 2);
  sreg_prev=SREG;
  cli();

  while (datlen--) {
    curbyte=(*data++);

    asm volatile(
    "       ldi   %0,8  \n\t"
    "loop%=:            \n\t"
    "       out   %2,%3 \n\t"    //  '1' [01] '0' [01] - 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' [03] '0' [02]
    "       out   %2,%4 \n\t"    //  '1' [--] '0' [03] - fe-low
    "       lsl   %1    \n\t"    //  '1' [04] '0' [04]
#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
    "       out   %2,%4 \n\t"    //  '1' [+1] '0' [+1] - fe-high
#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' [+2] '0' [+2]
    "       brne  loop%=\n\t"    //  '1' [+3] '0' [+4]
    :	"=&d" (ctr)
    :	"r" (curbyte), "I" (_SFR_IO_ADDR(_SFR_IO8((RGB_DI_PIN >> 4) + 2))), "r" (maskhi), "r" (masklo)
    );
  }

  SREG=sreg_prev;
}