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-rw-r--r--drivers/avr/ws2812.c342
1 files changed, 342 insertions, 0 deletions
diff --git a/drivers/avr/ws2812.c b/drivers/avr/ws2812.c
new file mode 100644
index 000000000..59e032bf7
--- /dev/null
+++ b/drivers/avr/ws2812.c
@@ -0,0 +1,342 @@
+/*
+* 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>
+#include "debug.h"
+
+#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)
+{
+ // 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(LED_TYPE *ledarray, uint16_t leds)
+{
+
+ #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 |= _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));
+
+
+ #ifndef RGBW_BB_TWI
+ _delay_us(80);
+ #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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