196 lines
5.7 KiB
C
196 lines
5.7 KiB
C
|
/*
|
||
|
|
* 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
|
||
|
|
*
|
||
|
|
* This program is free software: you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation, either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program 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 General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "ws2812.h"
|
||
|
|
#include <avr/interrupt.h>
|
||
|
|
#include <avr/io.h>
|
||
|
|
#include <util/delay.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Forward declare internal functions
|
||
|
|
*
|
||
|
|
* The functions take a byte-array and send to the data output as WS2812 bitstream.
|
||
|
|
* The length is the number of bytes to send - three per LED.
|
||
|
|
*/
|
||
|
|
|
||
|
|
void ws2812_sendarray(uint8_t *array, uint16_t length);
|
||
|
|
void ws2812_sendarray_mask(uint8_t *array, uint16_t length, uint8_t pinmask);
|
||
|
|
|
||
|
|
// Setleds for standard RGB
|
||
|
|
void inline ws2812_setleds(LED_TYPE *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(LED_TYPE *ledarray, uint16_t leds, uint8_t pinmask) {
|
||
|
|
// new universal format (DDR)
|
||
|
|
_SFR_IO8((RGB_DI_PIN >> 4) + 1) |= pinmask;
|
||
|
|
|
||
|
|
ws2812_sendarray_mask((uint8_t *)ledarray, leds * sizeof(LED_TYPE), pinmask);
|
||
|
|
|
||
|
|
#ifdef RGBW
|
||
|
|
_delay_us(80);
|
||
|
|
#else
|
||
|
|
_delay_us(50);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|