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114 lines
2.3 KiB
114 lines
2.3 KiB
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include <avr/cpufunc.h>
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#include <util/delay.h>
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#include <util/delay_basic.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <math.h>
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#include "utils.h"
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#include "arduino_pins.h"
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#define WS_PORT PORT_D8
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#define WS_BIT D8
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#define WS_DDR DDR_D8
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#define ws_high() sbi(WS_PORT, WS_BIT)
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#define ws_low() cbi(WS_PORT, WS_BIT)
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#define T1H 800 // Width of a 1 bit in ns
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#define T1L 450 // Width of a 1 bit in ns
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#define T0H 200 // Width of a 0 bit in ns
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#define T0L 650 // Width of a 0 bit in ns
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#define RES 50000 // Width of the low gap between bits to cause a frame to latch
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#define NS_PER_SEC (1000000000L) // Note that this has to be SIGNED since we want to be able to check for negative values of derivatives
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#define CYCLES_PER_SEC (16000000L)
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#define NS_PER_CYCLE ( NS_PER_SEC / CYCLES_PER_SEC )
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#define NS_TO_CYCLES(n) ( (n) / NS_PER_CYCLE )
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#define DELAY_CYCLES(n) ( ((n)>0) ? __builtin_avr_delay_cycles( n ) : __builtin_avr_delay_cycles( 0 ) ) // Make sure we never have a delay less than zero
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void ws_show()
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{
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ws_low();
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DELAY_CYCLES( NS_TO_CYCLES(RES) );
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}
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void ws_send_byte(uint8_t bb)
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{
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for (int8_t i = 7; i >= 0; --i) {
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if (bb & (1 << i)) {
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ws_high();
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DELAY_CYCLES( NS_TO_CYCLES( T1H ) - 2 );
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ws_low();
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DELAY_CYCLES( NS_TO_CYCLES( T1L ) - 10 );
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} else {
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ws_high();
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DELAY_CYCLES( NS_TO_CYCLES( T0H ) - 2 );
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ws_low();
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DELAY_CYCLES( NS_TO_CYCLES( T0L ) - 10 );
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}
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}
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}
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void ws_send_rgb(uint8_t r, uint8_t g, uint8_t b)
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{
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ws_send_byte(g);
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ws_send_byte(r);
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ws_send_byte(b);
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}
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void init_io(void) SECTION(".init8");
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void init_io()
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{
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set_bit(WS_DDR, WS_BIT, OUT);
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}
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void main()
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{
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while (1) {
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uint8_t r = 250;
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uint8_t g = 0;
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uint8_t b = 0;
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uint8_t step = 0;
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for (uint8_t i = 0; i < 30; i++) {
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ws_send_rgb(r, g, b);
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switch (step) {
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case 0:
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r -= 50;
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g += 50;
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if (g == 250) step++;
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break;
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case 1:
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g -= 50;
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b += 50;
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if (b == 250) step++;
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break;
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case 2:
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b -= 50;
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r += 50;
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if (r == 250) step=0;
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break;
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}
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}
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// ws_send_rgb(0x00, 0xFF, 0);
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ws_show();
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}
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}
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