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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
*
* 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;
}
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