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/*
* 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);
#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(void) {
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(void) {
// 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(void) {
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(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) {
#ifdef RGBW_BB_TWI
uint8_t sreg_prev, twcr_prev;
sreg_prev = SREG;
twcr_prev = TWCR;
cli();
TWCR &= ~(1 << TWEN);
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();
SREG = sreg_prev;
TWCR = twcr_prev;
#endif
// ws2812_DDRREG |= pinmask; // Enable DDR
// new universal format (DDR)
_SFR_IO8((RGB_DI_PIN >> 4) + 1) |= pinmask;
ws2812_sendarray_mask((uint8_t *)ledarray, leds * sizeof(LED_TYPE), pinmask);
#ifndef RGBW_BB_TWI
# ifdef RGBW
_delay_us(80);
# else
_delay_us(50);
# endif
#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;
}
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