reorg

projects/rgb_random_hsl/Makefile

@@ -0,0 +1,169 @@
+
+MCU	= atmega328p
+
+F_CPU = 16000000
+
+LFUSE = 0xFF
+HFUSE = 0xDE
+EFUSE = 0x05
+
+MAIN = main.c
+
+## If you've split your program into multiple files,
+## include the additional .c source (in same directory) here
+## (and include the .h files in your foo.c)
+LOCAL_SOURCE =
+
+## Here you can link to one more directory (and multiple .c files)
+# EXTRA_SOURCE_DIR = ../AVR-Programming-Library/
+EXTRA_SOURCE_DIR = lib/
+EXTRA_SOURCE_FILES = colors.c adc.c hsl.h
+
+EXTRA_FLAGS = -DHSL_LINEAR=1
+
+
+
+##########------------------------------------------------------##########
+##########                 Programmer Defaults                  ##########
+##########          Set up once, then forget about it           ##########
+##########        (Can override.  See bottom of file.)          ##########
+##########------------------------------------------------------##########
+#19200
+PROGRAMMER_TYPE = arduino
+PROGRAMMER_ARGS = -b 57600 -P /dev/ttyUSB0
+
+
+##########------------------------------------------------------##########
+##########                   Makefile Magic!                    ##########
+##########         Summary:                                     ##########
+##########             We want a .hex file                      ##########
+##########        Compile source files into .elf                ##########
+##########        Convert .elf file into .hex                   ##########
+##########        You shouldn't need to edit below.             ##########
+##########------------------------------------------------------##########
+
+## Defined programs / locations
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+AVRSIZE = avr-size
+AVRDUDE = avrdude
+
+## Compilation options, type man avr-gcc if you're curious.
+CFLAGS = -std=gnu99 -mmcu=$(MCU) -DF_CPU=$(F_CPU)UL -I. -I$(EXTRA_SOURCE_DIR)
+CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -Wall -Wno-main -Wno-strict-prototypes -Wno-comment
+CFLAGS += -g2 -Wextra -pedantic -Wfatal-errors
+CFLAGS += -ffunction-sections -fdata-sections -Wl,--gc-sections -Wl,--relax
+CFLAGS += $(EXTRA_FLAGS)
+
+CFLAGS_BUILD = $(CFLAGS) -Os
+
+# CFLAGS += -lm
+## CFLAGS += -Wl,-u,vfprintf -lprintf_flt -lm  ## for floating-point printf
+## CFLAGS += -Wl,-u,vfprintf -lprintf_min      ## for smaller printf
+
+## Lump target and extra source files together
+TARGET = $(strip $(basename $(MAIN)))
+SRC1 = $(TARGET).c
+SRC = $(SRC1)
+EXTRA_SOURCE = $(addprefix $(EXTRA_SOURCE_DIR), $(EXTRA_SOURCE_FILES))
+SRC += $(EXTRA_SOURCE)
+SRC += $(LOCAL_SOURCE)
+
+## List of all header files
+HEADERS = $(SRC:.c=.h)
+
+## For every .c file, compile an .o object file
+OBJ = $(SRC:.c=.o)
+
+## Generic Makefile targets.  (Only .hex file is necessary)
+all: $(TARGET).hex size
+pre: $(TARGET).pre
+
+%.hex: %.elf
+	$(OBJCOPY) -R .eeprom -O ihex $< $@
+
+%.elf: $(SRC)
+	$(CC) $(CFLAGS_BUILD) $(SRC) --output $@
+
+%.pre: $(SRC1)
+	$(CC) $(CFLAGS) -E $(SRC1) --output $@
+
+%.eeprom: %.elf
+	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
+
+debug:
+	@echo
+	@echo "Source files:"   $(SRC)
+	@echo "MCU, F_CPU, BAUD:"  $(MCU), $(F_CPU), $(BAUD)
+	@echo
+
+# Optionally create listing file from .elf
+# This creates approximate assembly-language equivalent of your code.
+# Useful for debugging time-sensitive bits,
+# or making sure the compiler does what you want.
+disassemble: $(TARGET).lst
+
+dis: disassemble
+lst: disassemble
+
+eeprom: $(TARGET).eeprom
+
+%.lst: %.elf
+	$(OBJDUMP) -S $< > $@
+
+# Optionally show how big the resulting program is
+size:  $(TARGET).elf
+	$(AVRSIZE) -C --mcu=$(MCU) $(TARGET).elf
+
+clean:
+	rm -f $(TARGET).elf $(TARGET).hex $(TARGET).obj \
+	$(TARGET).o $(TARGET).d $(TARGET).eep $(TARGET).lst \
+	$(TARGET).lss $(TARGET).sym $(TARGET).map $(TARGET)~ \
+	$(TARGET).eeprom
+
+squeaky_clean:
+	rm -f *.elf *.hex *.obj *.o *.d *.eep *.lst *.lss *.sym *.map *~
+
+
+##########------------------------------------------------------##########
+##########              Programmer-specific details             ##########
+##########           Flashing code to AVR using avrdude         ##########
+##########------------------------------------------------------##########
+
+flash: $(TARGET).hex
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U flash:w:$<
+
+flash_eeprom: $(TARGET).eeprom
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U eeprom:w:$<
+
+terminal:
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nt
+
+
+flash_arduino: PROGRAMMER_TYPE = arduino
+flash_arduino: PROGRAMMER_ARGS =
+flash_arduino: flash
+
+flash_dragon_isp: PROGRAMMER_TYPE = dragon_isp
+flash_dragon_isp: PROGRAMMER_ARGS =
+flash_dragon_isp: flash
+
+
+##########------------------------------------------------------##########
+##########       Fuse settings and suitable defaults            ##########
+##########------------------------------------------------------##########
+
+## Generic
+FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
+
+fuses:
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) \
+	           $(PROGRAMMER_ARGS) $(FUSE_STRING)
+show_fuses:
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nv
+
+## Called with no extra definitions, sets to defaults
+set_default_fuses:  FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
+set_default_fuses:  fuses

projects/rgb_random_hsl/README.md

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+Randomly turns on and the fades out pixels
+
+Uses HSL for picking the color.

projects/rgb_random_hsl/lib/README.md

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+AVR utils library
+=================
+
+This is my ever-evolving library (not only) for AVR programming.
+
+When I'm done with a project, I copy the current library to the project, so it doesn't break when I do further improvements.
+
+Each library file contains a large comment block explaining it's function.
+
+You may need to add "c" files to your makefile for some of the library files.

projects/rgb_random_hsl/lib/adc.c

@@ -0,0 +1,46 @@
+#include <avr/io.h>
+#include <stdbool.h>
+
+#include "calc.h"
+#include "adc.h"
+
+/** Initialize the ADC */
+void adc_init()
+{
+	ADCSRA |= _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0);  // 128 prescaler -> 125 kHz
+	ADMUX  |= _BV(REFS0);  // Voltage reference
+	sbi(ADCSRA, ADEN);  // Enable ADC
+}
+
+
+/** Disable AD */
+void adc_disable()
+{
+	cbi(ADCSRA, ADEN);
+}
+
+
+/** Sample analog pin with 8-bit precision */
+uint8_t adc_read_byte(uint8_t channel)
+{
+	write_low_nibble(ADMUX, channel);  // Select channel to sample
+	sbi(ADMUX, ADLAR);  // Align result to left
+	sbi(ADCSRA, ADSC);  // Start conversion
+
+	while(bit_is_high(ADCSRA, ADSC));  // Wait for it...
+
+	return ADCH;  // The upper 8 bits of ADC result
+}
+
+
+/** Sample analog pin with 10-bit precision */
+uint16_t adc_read_word(uint8_t channel)
+{
+	write_low_nibble(ADMUX, channel);  // Select channel to sample
+	cbi(ADMUX, ADLAR);  // Align result to right
+	sbi(ADCSRA, ADSC);  // Start conversion
+
+	while(get_bit(ADCSRA, ADSC));  // Wait for it...
+
+	return ADCW;  // The whole ADC word (10 bits)
+}

projects/rgb_random_hsl/lib/adc.h

@@ -0,0 +1,19 @@
+#pragma once
+
+/*
+  Utilities for build-in A/D converter
+*/
+
+#include <avr/io.h>
+
+/** Initialize the ADC */
+void adc_init();
+
+/** Disable AD (for power saving?) */
+void adc_disable();
+
+/** Sample analog pin with 8-bit precision */
+uint8_t adc_read_byte(uint8_t channel);
+
+/** Sample analog pin with 10-bit precision */
+uint16_t adc_read_word(uint8_t channel);

projects/rgb_random_hsl/lib/colors.h

@@ -0,0 +1,84 @@
+#pragma once
+
+/*
+  Some useful utilities for RGB color manipulation
+
+  The XXXc macros don't use cast, so they can be used in array initializers.
+
+  xrgb ... 3-byte true-color RGB (8 bits per component)
+  rgbXX ... XX-bit color value, with equal nr of bits per component
+
+  XX_r (_g, _b) ... extract component from the color, and convert it to 0..255
+*/
+
+
+typedef struct {
+	uint8_t r;
+	uint8_t g;
+	uint8_t b;
+} xrgb_t;
+
+typedef uint32_t rgb24_t;
+typedef uint16_t rgb16_t;
+typedef uint16_t rgb12_t;
+typedef uint8_t rgb6_t;
+
+
+#define xrgb(rr, gg, bb) ((xrgb_t)xrgbc(rr, gg, bb))
+// xrgb for constant array declarations
+#define xrgbc(rr, gg, bb) { .r = ((uint8_t)(rr)), .g = ((uint8_t)(gg)), .b = ((uint8_t)(bb)) }
+#define xrgb_r(c) ((uint8_t)(c.r))
+#define xrgb_g(c) ((uint8_t)(c.g))
+#define xrgb_b(c) ((uint8_t)(c.b))
+#define xrgb_rgb24(c) ((((rgb24_t)c.r) << 16) | (((rgb24_t)c.g) << 8) | (((rgb24_t)c.b)))
+#define xrgb_rgb15(c) (((((rgb15_t)c.r) & 0xF8) << 7) | ((((rgb15_t)c.g) & 0xF8) << 2) | ((((rgb15_t)c.b) & 0xF8) >> 3))
+#define xrgb_rgb12(c) (((((rgb12_t)c.r) & 0xF0) << 4) | ((((rgb12_t)c.g) & 0xF0)) | ((((rgb12_t)c.b) & 0xF0) >> 4))
+#define xrgb_rgb6(c)  (((((rgb6_t)c.r) & 0xC0) >> 2)  | ((((rgb6_t)c.g) & 0xC0) >> 4) | ((((rgb6_t)c.b) & 0xC0) >> 6))
+
+
+#define rgb24c(r,g,b) (((((rgb24_t)r) & 0xFF) << 16) | ((((rgb24_t)g) & 0xFF) << 8) | (((rgb24_t)b) & 0xFF))
+#define rgb24(r,g,b) ((rgb24_t) rgb24(r,g,b))
+
+#define rgb24_r(c) ((((rgb24_t) (c)) >> 16) & 0xFF)
+#define rgb24_g(c) ((((rgb24_t) (c)) >> 8) & 0xFF)
+#define rgb24_b(c) ((((rgb24_t) (c)) >> 0) & 0xFF)
+#define rgb24_xrgb(c) xrgb(rgb24_r(c), rgb24_g(c), rgb24_b(c))
+#define rgb24_xrgbc(c) xrgbc(rgb24_r(c), rgb24_g(c), rgb24_b(c))
+
+
+#define rgb15(r,g,b) ((rgb16_t) rgb15c(r,g,b))
+#define rgb15c(r,g,b) (((r & 0x1F) << 10) | ((g & 0x1F) << 5) | (b & 0x1F))
+
+#define rgb15_r(c) ((((rgb15_t) (c)) & 0x7C00) >> 7)
+#define rgb15_g(c) ((((rgb15_t) (c)) & 0x3E0) >> 2)
+#define rgb15_b(c) ((((rgb15_t) (c)) & 0x1F) << 3)
+#define rgb15_xrgb(c)  xrgb(rgb15_r(c), rgb15_g(c), rgb15_b(c))
+#define rgb15_rgb24(c) rgb24(rgb15_r(c), rgb15_g(c), rgb15_b(c))
+#define rgb15_rgb24c(c) rgb24c(rgb15_r(c), rgb15_g(c), rgb15_b(c))
+
+
+#define rgb12(r,g,b) ((rgb12_t) rgb12c(r,g,b))
+#define rgb12c(r,g,b) (((r & 0xF) << 8) | ((g & 0xF) << 4) | (b & 0xF))
+
+#define rgb12_r(c) ((((rgb12_t) (c)) & 0xF00) >> 4)
+#define rgb12_g(c) (((rgb12_t) (c)) & 0xF0)
+#define rgb12_b(c) (((r(rgb12_t) (c)gb) & 0x0F) << 4)
+#define rgb12_xrgb(c)  xrgb(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+#define rgb12_xrgbc(c)  xrgbc(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+#define rgb12_rgb24(c) rgb24(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+#define rgb12_rgb24c(c) rgb24c(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+
+
+#define rgb6(r,g,b) ((rgb6_t) rgb6c(r,g,b))
+#define rgb6c(r,g,b) (((r & 3) << 4) | ((g & 3) << 2) | (b & 3))
+
+#define rgb6_r(c) ((((rgb6_t) (c)) & 0x30) << 2)
+#define rgb6_g(c) ((((rgb6_t) (c)) & 0xC) << 4)
+#define rgb6_b(c) ((((rgb6_t) (c)) & 0x3) << 6)
+#define rgb6_xrgb(c)  xrgb(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+#define rgb6_xrgbc(c)  xrgbc(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+#define rgb6_rgb24(c) rgb24(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+#define rgb6_rgb24c(c) rgb24c(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+
+#define add_xrgb(x, y) ((xrgb_t) { (((y).r > (255 - (x).r)) ? 255 : ((x).r + (y).r)), (((y).g > (255 - (x).g)) ? 255 : ((x).g + (y).g)), (((y).b > 255 - (x).b) ? 255 : ((x).b + (y).b)) })
+

projects/rgb_random_hsl/lib/debounce.c

@@ -0,0 +1,45 @@
+#include <avr/io.h>
+#include <stdbool.h>
+
+#include "debounce.h"
+#include "calc.h"
+#include "pins.h"
+#include "debo_config.h"
+
+/** Debounce data array */
+uint8_t debo_next_slot = 0;
+
+uint8_t debo_register(PORT_P reg, uint8_t bit, bool invert)
+{
+	debo_slots[debo_next_slot] = (debo_slot_t){
+		.reg = reg,
+		.bit = bit | ((invert & 1) << 7) | (get_bit_p(reg, bit) << 6), // bit 7 = invert, bit 6 = state
+		.count = 0,
+	};
+
+	return debo_next_slot++;
+}
+
+
+/** Check debounced pins, should be called periodically. */
+void debo_tick()
+{
+	for (uint8_t i = 0; i < debo_next_slot; i++) {
+		// current pin value (right 3 bits, xored with inverse bit)
+		bool value = get_bit_p(debo_slots[i].reg, debo_slots[i].bit & 0x7);
+
+		if (value != get_bit(debo_slots[i].bit, 6)) {
+
+			// different pin state than last recorded state
+			if (debo_slots[i].count < DEBO_TICKS) {
+				debo_slots[i].count++;
+			} else {
+				// overflown -> latch value
+				set_bit(debo_slots[i].bit, 6, value); // set state bit
+				debo_slots[i].count = 0;
+			}
+		} else {
+			debo_slots[i].count = 0; // reset the counter
+		}
+	}
+}

projects/rgb_random_hsl/lib/debounce.h

@@ -0,0 +1,63 @@
+#pragma once
+
+/**
+  An implementation of button debouncer.
+
+  ----
+
+  You must provide a config file debo_config.h (next to your main.c)
+
+  Example:
+    #pragma once
+    #define DEBO_CHANNELS 2
+    #define DDEBO_TICKS 5
+
+  ----
+
+  A pin is registered like this:
+
+    #define BTN1 B,0
+    #define BTN2 B,1
+
+    debo_add(BTN0);  // The function returns number assigned to the pin (0, 1, ...)
+    debo_add_rev(BTN1);  // active low
+    debo_register(&PINB, PB2, 0);  // direct access - register, pin & invert
+
+  Then periodically call the tick function (perhaps in a timer interrupt):
+
+    debo_tick();
+
+  To check if input is active, use
+
+    debo_get_pin(0); // state of input #0 (registered first)
+    debo_get_pin(1); // state of input #1 (registered second)
+*/
+
+#include <avr/io.h>
+#include <stdbool.h>
+
+#include "calc.h"
+#include "pins.h"
+#include "debo_config.h"
+
+/* Internal deboucer entry */
+typedef struct {
+	PORT_P reg;    // pointer to IO register
+	uint8_t bit;   // bits 6 and 7 of this hold "state" & "invert" flag
+	uint8_t count; // number of ticks this was in the new state
+} debo_slot_t;
+
+debo_slot_t debo_slots[DEBO_CHANNELS];
+
+/** Add a pin for debouncing */
+#define debo_add_rev(io) debo_register(&io2pin(io_pack(io)), io2n(io_pack(io)), 1)
+#define debo_add(io)  debo_register(&io2pin(io_pack(io)), io2n(io_pack(io)), 0)
+
+/** Add a pin for debouncing (low level function) */
+uint8_t debo_register(PORT_P pin_reg_pointer, uint8_t bit, bool invert);
+
+/** Check debounced pins, should be called periodically. */
+void debo_tick();
+
+/** Get a value of debounced pin */
+#define debo_get_pin(i) (get_bit(debo_slots[i].bit, 6) ^ get_bit(debo_slots[i].bit, 7))

projects/rgb_random_hsl/lib/hsl.c

@@ -0,0 +1,76 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include "colors.h"
+#include "hsl.h"
+
+// based on: https://github.com/lewisd32/avr-hsl2rgb
+xrgb_t hsl2xrgb(const hsl_t cc)
+{
+	// 0 .. 256*3
+	const uint16_t hh = (uint16_t) cc.h * 3;
+	const uint8_t hue_mod = hh % 256;
+
+	uint8_t r_temp, g_temp, b_temp;
+	if (hh < 256) {
+		r_temp = hue_mod ^ 255;
+		g_temp = hue_mod;
+		b_temp = 0;
+	} else if (hh < 512) {
+		r_temp = 0;
+		g_temp = hue_mod ^ 255;
+		b_temp = hue_mod;
+	} else if (hh < 768) {
+		r_temp = hue_mod;
+		g_temp = 0;
+		b_temp = hue_mod ^ 255;
+	} else {
+		r_temp = 0;
+		g_temp = 0;
+		b_temp = 0;
+	}
+
+	const uint8_t inverse_sat = (cc.s ^ 255);
+
+	xrgb_t rgb;
+
+	uint8_t t8;
+	uint16_t t16;
+
+#ifdef HSL_LINEAR
+	const uint8_t bri = FADE_128[cc.l>>1];
+#else
+	const uint8_t bri = cc.l;
+#endif
+
+	t8 = r_temp;
+	t16 = t8 * cc.s + t8;
+	t16 = t16 + t8;
+	t8 = t16 >> 8;
+	t8 = t8 + inverse_sat;
+	t16 = t8 * bri;
+	t16 = t16 + t8;
+	t8 = t16 >> 8;
+	rgb.r = t8;
+
+	t8 = g_temp;
+	t16 = t8 * cc.s;
+	t16 = t16 + t8;
+	t8 = t16 >> 8;
+	t8 = t8 + inverse_sat;
+	t16 = t8 * bri;
+	t16 = t16 + t8;
+	t8 = t16 >> 8;
+	rgb.g = t8;
+
+	t8 = b_temp;
+	t16 = t8 * cc.s;
+	t16 = t16 + t8;
+	t8 = t16 >> 8;
+	t8 = t8 + inverse_sat;
+	t16 = t8 * bri;
+	t16 = t16 + t8;
+	t8 = t16 >> 8;
+	rgb.b = t8;
+
+	return rgb;
+}

projects/rgb_random_hsl/lib/hsl.h

@@ -0,0 +1,22 @@
+#pragma once
+
+/*
+  HSL support (addition to colors.h)
+*/
+
+#include "colors.h"
+
+// Define HSL_LINEAR to get more linear brightness in hsl->rgb conversion
+#ifdef HSL_LINEAR
+# include "linear_fade.h"
+#endif
+
+// HSL data structure
+typedef struct {
+	uint8_t h;
+	uint8_t s;
+	uint8_t l;
+} hsl_t;
+
+/* Convert HSL to XRGB */
+xrgb_t hsl2xrgb(const hsl_t color);

projects/rgb_random_hsl/lib/lcd.c

@@ -0,0 +1,284 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+
+#include "calc.h"
+#include "pins.h"
+#include "nsdelay.h"
+#include "lcd.h"
+#include "lcd_config.h"
+
+// Start address of rows
+const uint8_t LCD_ROW_ADDR[] = {0x00, 0x40, 0x14, 0x54};
+
+// Internal prototypes
+void _lcd_mode_r();
+void _lcd_mode_w();
+void _lcd_clk();
+void _lcd_wait_bf();
+void _lcd_write_byte(uint8_t bb);
+uint8_t _lcd_read_byte();
+
+
+// Write utilities
+#define _lcd_write_low(bb)  _lcd_write_nibble((bb) & 0x0F)
+#define _lcd_write_high(bb) _lcd_write_nibble(((bb) & 0xF0) >> 4)
+#define _lcd_write_nibble(nib) do {                \
+	write_pin(LCD_D7, get_bit((nib), 3));     \
+	write_pin(LCD_D6, get_bit((nib), 2));     \
+	write_pin(LCD_D5, get_bit((nib), 1));     \
+	write_pin(LCD_D4, get_bit((nib), 0));     \
+} while(0)
+
+
+// 0 W, 1 R
+bool _lcd_mode;
+
+
+/** Initialize the display */
+void lcd_init()
+{
+	// configure pins as output
+	as_output(LCD_E);
+	as_output(LCD_RW);
+	as_output(LCD_RS);
+	_lcd_mode = 1;  // force data pins to output
+	_lcd_mode_w();
+
+	// Magic sequence to invoke Cthulhu (or enter 4-bit mode)
+	_delay_ms(16);
+	_lcd_write_nibble(0b0011);
+	_lcd_clk();
+	_delay_ms(5);
+	_lcd_clk();
+	_delay_ms(5);
+	_lcd_clk();
+	_delay_ms(5);
+	_lcd_write_nibble(0b0010);
+	_lcd_clk();
+	_delay_us(100);
+
+	// Configure the display
+	lcd_write_command(LCD_IFACE_4BIT_2LINE);
+	lcd_write_command(LCD_DISABLE);
+	lcd_write_command(LCD_CLEAR);
+	lcd_write_command(LCD_MODE_INC);
+
+	// mark as enabled
+	lcd_enable();
+}
+
+
+/** Send a pulse on the ENABLE line */
+void _lcd_clk()
+{
+	pin_up(LCD_E);
+	delay_ns(420);
+	pin_down(LCD_E);
+}
+
+
+/** Enter READ mode */
+void _lcd_mode_r()
+{
+	if (_lcd_mode == 1) return;  // already in R mode
+
+	pin_up(LCD_RW);
+
+	as_input_pu(LCD_D7);
+	as_input_pu(LCD_D6);
+	as_input_pu(LCD_D5);
+	as_input_pu(LCD_D4);
+
+	_lcd_mode = 1;
+}
+
+
+/** Enter WRITE mode */
+void _lcd_mode_w()
+{
+	if (_lcd_mode == 0) return;  // already in W mode
+
+	pin_down(LCD_RW);
+
+	as_output(LCD_D7);
+	as_output(LCD_D6);
+	as_output(LCD_D5);
+	as_output(LCD_D4);
+
+	_lcd_mode = 0;
+}
+
+
+/** Read a byte */
+uint8_t _lcd_read_byte()
+{
+	_lcd_mode_r();
+
+	uint8_t res = 0;
+
+	_lcd_clk();
+	res = (read_pin(LCD_D7) << 7) | (read_pin(LCD_D6) << 6) | (read_pin(LCD_D5) << 5) | (read_pin(LCD_D4) << 4);
+
+	_lcd_clk();
+	res |= (read_pin(LCD_D7) << 3) | (read_pin(LCD_D6) << 2) | (read_pin(LCD_D5) << 1) | (read_pin(LCD_D4) << 0);
+
+	return res;
+}
+
+
+/** Write an instruction byte */
+void lcd_write_command(uint8_t bb)
+{
+	_lcd_wait_bf();
+	pin_down(LCD_RS);  // select instruction register
+	_lcd_write_byte(bb);    // send instruction byte
+}
+
+
+/** Write a data byte */
+void lcd_write_data(uint8_t bb)
+{
+	_lcd_wait_bf();
+	pin_up(LCD_RS);  // select data register
+	_lcd_write_byte(bb);  // send data byte
+}
+
+
+/** Read BF & Address */
+uint8_t lcd_read_bf_addr()
+{
+	pin_down(LCD_RS);
+	return _lcd_read_byte();
+}
+
+
+/** Read CGRAM or DDRAM */
+uint8_t lcd_read_ram()
+{
+	pin_up(LCD_RS);
+	return _lcd_read_byte();
+}
+
+
+/** Write a byte using the 8-bit interface */
+void _lcd_write_byte(uint8_t bb)
+{
+	_lcd_mode_w();  // enter W mode
+
+	_lcd_write_high(bb);
+	_lcd_clk();
+
+	_lcd_write_low(bb);
+	_lcd_clk();
+}
+
+
+
+/** Wait until the device is ready */
+void _lcd_wait_bf()
+{
+	uint8_t d = 0;
+	while(d++ < 120 && lcd_read_bf_addr() & _BV(7))
+		_delay_us(1);
+}
+
+
+/** Send a string to LCD */
+void lcd_str(char* str_p)
+{
+	while (*str_p)
+		lcd_char(*str_p++);
+}
+
+
+/** Sedn a char to LCD */
+void lcd_char(const char c)
+{
+	lcd_write_data(c);
+}
+
+
+/** Set cursor position */
+void lcd_xy(const uint8_t x, const uint8_t y)
+{
+	lcd_set_addr(LCD_ROW_ADDR[y] + (x));
+}
+
+
+uint8_t _lcd_old_cursor = CURSOR_NONE;
+bool _lcd_enabled = false;
+
+/** Set LCD cursor. If not enabled, only remember it. */
+void lcd_cursor(uint8_t type)
+{
+	_lcd_old_cursor = (type & CURSOR_BOTH);
+
+	if (_lcd_enabled) lcd_write_command(LCD_CURSOR_NONE | _lcd_old_cursor);
+}
+
+
+/** Display display (preserving cursor) */
+void lcd_disable()
+{
+	lcd_write_command(LCD_DISABLE);
+	_lcd_enabled = false;
+}
+
+
+/** Enable display (restoring cursor) */
+void lcd_enable()
+{
+	_lcd_enabled = true;
+	lcd_cursor(_lcd_old_cursor);
+}
+
+
+/** Go home */
+void lcd_home()
+{
+	lcd_write_command(LCD_HOME);
+}
+
+
+/** Clear the screen */
+void lcd_clear()
+{
+	lcd_write_command(LCD_CLEAR);
+}
+
+
+/** Define a glyph */
+void lcd_define_glyph(const uint8_t index, const uint8_t* array)
+{
+	lcd_set_addr_cgram(index * 8);
+	for (uint8_t i = 0; i < 8; ++i)	{
+		lcd_write_data(array[i]);
+	}
+}
+
+
+/** Define a glyph */
+void lcd_define_glyph_pgm(const uint8_t index, const uint8_t* array)
+{
+	lcd_set_addr_cgram(index * 8);
+	for (uint8_t i = 0; i < 8; ++i)	{
+		lcd_write_data(pgm_read_byte(&array[i]));
+	}
+}
+
+
+/** Set address in CGRAM */
+void lcd_set_addr_cgram(const uint8_t acg)
+{
+	lcd_write_command(0b01000000 | ((acg) & 0b00111111));
+}
+
+
+/** Set address in DDRAM */
+void lcd_set_addr(const uint8_t add)
+{
+	lcd_write_command(0b10000000 | ((add) & 0b01111111));
+}

projects/rgb_random_hsl/lib/lcd.h

@@ -0,0 +1,130 @@
+#pragma once
+
+/*
+  HD44780 LCD display driver - 4-bit mode
+
+  LCD pins are configured using a file lcd_config.h, which you
+  have to add next to your main.c file.
+
+  Content can be something like this:
+
+    #pragma once
+    #include "lib/arduino_pins.h"
+    #define LCD_RS D10
+    #define LCD_RW D11
+    #define LCD_E  D12
+    #define LCD_D4 D13
+    #define LCD_D5 D14
+    #define LCD_D6 D15
+    #define LCD_D7 D16
+
+*/
+
+#include <stdint.h>
+#include "lcd_config.h"
+
+// Commands
+
+// Clear screen (reset)
+#define LCD_CLEAR 0b00000001
+// Move cursor to (0,0), unshift...
+#define LCD_HOME  0b00000010
+
+// Set mode: Increment + NoShift
+#define LCD_MODE_INC         0b00000110
+// Set mode: Increment + Shift
+#define LCD_MODE_INC_SHIFT   0b00000111
+
+// Set mode: Decrement + NoShift
+#define LCD_MODE_DEC         0b00000100
+// Set mode: Decrement + Shift
+#define LCD_MODE_DEC_SHIFT   0b00000101
+
+// Disable display (data remains untouched)
+#define LCD_DISABLE          0b00001000
+
+// Disable cursor
+#define LCD_CURSOR_NONE      0b00001100
+// Set cursor to still underscore
+#define LCD_CURSOR_BAR       0b00001110
+// Set cursor to blinking block
+#define LCD_CURSOR_BLINK     0b00001101
+// Set cursor to both of the above at once
+#define LCD_CURSOR_BOTH      (LCD_CURSOR_BAR | LCD_CURSOR_BLINK)
+
+// Move cursor
+#define LCD_MOVE_LEFT  0b00010000
+#define LCD_MOVE_RIGHT 0b00010100
+
+// Shift display
+#define LCD_SHIFT_LEFT  0b00011000
+#define LCD_SHIFT_RIGHT 0b00011100
+
+// Set iface to 5x7 font, 1-line
+#define LCD_IFACE_4BIT_1LINE 0b00100000
+#define LCD_IFACE_8BIT_1LINE 0b00110000
+// Set iface to 5x7 font, 2-line
+#define LCD_IFACE_4BIT_2LINE 0b00101000
+#define LCD_IFACE_8BIT_2LINE 0b00111000
+
+
+/** Initialize the display */
+void lcd_init();
+
+/** Write an instruction byte */
+void lcd_write_command(uint8_t bb);
+
+/** Write a data byte */
+void lcd_write_data(uint8_t bb);
+
+/** Read BF & Address */
+uint8_t lcd_read_bf_addr();
+
+/** Read CGRAM or DDRAM */
+uint8_t lcd_read_ram();
+
+/** Send a string to LCD */
+void lcd_str(char* str_p);
+
+/** Sedn a char to LCD */
+void lcd_char(const char c);
+
+/** Show string at X, Y */
+#define lcd_str_xy(x, y, str_p) do { lcd_xy((x), (y)); lcd_str((str_p)); } while(0)
+
+/** Show char at X, Y */
+#define lcd_char_xy(x, y, c) do { lcd_xy((x), (y)); lcd_char((c)); } while(0)
+
+/** Set cursor position */
+void lcd_xy(const uint8_t x, const uint8_t y);
+
+/** Set LCD cursor. If not enabled, only remember it. */
+#define CURSOR_NONE  0b00
+#define CURSOR_BAR   0b10
+#define CURSOR_BLINK 0b01
+#define CURSOR_BOTH  0b11
+void lcd_cursor(uint8_t type);
+
+/** Display display (preserving cursor) */
+void lcd_disable();
+
+/** Enable display (restoring cursor) */
+void lcd_enable();
+
+/** Go home */
+void lcd_home();
+
+/** Clear the screen */
+void lcd_clear();
+
+/** Define a glyph */
+void lcd_define_glyph(const uint8_t index, const uint8_t* array);
+
+/** Define a glyph */
+void lcd_define_glyph_pgm(const uint8_t index, const uint8_t* array);
+
+/** Set address in CGRAM */
+void lcd_set_addr_cgram(const uint8_t acg);
+
+/** Set address in DDRAM */
+void lcd_set_addr(const uint8_t add);

projects/rgb_random_hsl/lib/linear_fade.h

@@ -0,0 +1,13 @@
+#pragma once
+#include <stdint.h>
+
+const uint8_t FADE_128[] = {
+	0,	1,	1,	1,	1,	1,	2,	2,	2,	2,	2,	3,	3,	3,	4,	4,	4,	4,
+	5,	5,	6,	6,	6,	7,	7,	8,	8,	8,	9,	10,	10,	10,	11,	12,	13,	14,
+	14,	15,	16,	17,	18,	20,	21,	22,	24,	26,	27,	28,	30,	31,	32,	34,	35,	36,
+	38,	39,	40,	41,	42,	44,	45,	46,	48,	49,	50,	52,	54,	56,	58,	59,	61,	63,
+	65,	67,	68,	69,	71,	72,	74,	76,	78,	80,	82,	85,	88,	90,	92,	95,	98,	100,
+	103, 106, 109, 112, 116, 119, 122, 125, 129, 134, 138, 142,	147, 151,
+	153, 156, 160, 163, 165, 170, 175, 180, 185, 190, 195, 200, 207, 214, 218,
+	221, 225, 228, 232, 234, 241, 248, 254, 255
+};

projects/rgb_random_hsl/main.c

@@ -0,0 +1,66 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "lib/meta.h"
+#include "lib/arduino_pins.h"
+#include "lib/calc.h"
+
+#include "lib/colors.h"
+#include "lib/hsl.h"
+#include "lib/adc.h"
+
+#define WS_T_1H  800
+#define WS_T_1L  400
+#define WS_T_0H  120
+#define WS_T_0L  900
+
+#include "lib/ws_rgb.h"
+
+#define WS1   D2
+
+void SECTION(".init8") init()
+{
+	adc_init();
+	srand(adc_read_word(0));
+
+	as_output(WS1);
+}
+
+
+void main()
+{
+	#define SIZE 16
+	hsl_t board[SIZE];
+	xrgb_t screen[SIZE];
+
+	for (uint8_t i = 0; i < SIZE; i++) {
+		board[i]  = (hsl_t)  {.h=0, .s=255, .l=0};
+		screen[i] = (xrgb_t) {.r=0, .g=0, .b=0};
+	}
+
+	while(1) {
+		for(uint8_t i = 0; i < SIZE; i++) {
+			if (board[i].l > 0) {
+				board[i].l--;
+			}
+
+			screen[i] = hsl2xrgb(board[i]);
+		}
+
+		if (rand() % 50 == 0) {
+			uint8_t i = rand() % SIZE;
+
+			if (board[i].l == 0) {
+				board[i].h = rand() % 256;
+				board[i].s = 200 + rand() % 56;
+				board[i].l = 255;
+			}
+		}
+
+		ws_send_xrgb_array(WS1, screen, SIZE);
+		_delay_ms(2);
+	}
+}

projects/rgb_random_wander/lib/arduino_pins.h

@@ -0,0 +1,42 @@
+#pragma once
+
+/**
+  Pin definitions for Arduino (Pro Mini with ATmega328P)
+*/
+
+#include "pins.h"
+
+#define D0 D,0
+#define D1 D,1
+#define D2 D,2
+#define D3 D,3
+#define D4 D,4
+#define D5 D,5
+#define D6 D,6
+#define D7 D,7
+#define D8 B,0
+#define D9 B,1
+#define D10 B,2
+
+// MOSI MISO SCK - not good for input
+#define D11 B,3
+#define D12 B,4
+#define D13 B,5
+
+#define D14 C,0
+#define D15 C,1
+#define D16 C,2
+#define D17 C,3
+#define D18 C,4
+#define D19 C,5
+#define D20 C,6
+#define D21 C,7
+
+#define A0 C,0
+#define A1 C,1
+#define A2 C,2
+#define A3 C,3
+#define A4 C,4
+#define A5 C,5
+#define A6 C,6
+#define A7 C,7

projects/rgb_random_wander/lib/calc.h

@@ -0,0 +1,89 @@
+#pragma once
+
+/**
+  Bit and byte manipulation utilities
+*/
+
+
+// --- Increment in range ---
+// when overflown, wraps within range. Lower bound < upper bound.
+// ..., upper bound excluded
+#define inc_wrap(var, min, max)  do { if ((var) >= (max - 1)) { (var) = (min); } else { (var)++; } } while(0)
+// ..., upper bound included
+#define inc_wrapi(var, min, max) inc_wrap((var), (min), (max) + 1)
+
+
+// --- Decrement in range ---
+// when underflown, wraps within range. Lower bound < upper bound.
+// ..., upper bound excluded
+#define dec_wrap(var, min, max)  do { if ((var) <= (min)) { (var) = (max) - 1; } else { (var)--; } } while(0)
+// ..., upper bound included
+#define dec_wrapi(var, min, max) dec_wrap((var), (min), (max) + 1)
+
+
+// --- Bit manipulation --
+
+// Set bit
+#define sbi(reg, bit) do { (reg) |=  (1 << (uint8_t)(bit)); } while(0)
+
+// Clear bit
+#define cbi(reg, bit) do { (reg) &= ~(1 << (uint8_t)(bit)); } while(0)
+
+// Get n-th bit
+#define read_bit(reg, bit) (((reg) >> (uint8_t)(bit)) & 0x1)
+#define get_bit(reg, bit)  read_bit(reg, bit)
+
+// Test n-th bit (Can't use bit_is_set, as it's redefined in sfr_def.h)
+#define bit_is_high(reg, bit) read_bit(reg, bit)
+#define bit_is_low(reg, bit)  (!read_bit(reg, bit))
+
+// Write value to n-th bit
+#define write_bit(reg, bit, value) do { (reg) = ((reg) & ~(1 << (uint8_t)(bit))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } while(0)
+#define set_bit(reg, bit, value)   write_bit(reg, bit, value)
+
+// Invert n-th bit
+#define toggle_bit(reg, bit)       do { (reg) ^= (1 << (uint8_t)(bit)); } while(0)
+
+
+// --- Bit manipulation with pointer to variable ---
+
+// Set n-th bit in pointee
+#define sbi_p(reg_p, bit) do { (*(reg_p)) |=  (1 << (uint8_t)(bit)); } while(0)
+// Clear n-th bit in pointee
+#define cbi_p(reg_p, bit) do { (*(reg_p)) &= ~(1 << (uint8_t)(bit)); } while(0)
+
+// Get n-th bit in pointee
+#define read_bit_p(reg_p, bit) ((*(reg_p) >> (uint8_t)(bit)) & 0x1)
+#define get_bit_p(reg_p, bit)  read_bit_p(reg_p, bit)
+
+// Test n-th bit in pointee (Can't use bit_is_set, as it's redefined in sfr_def.h)
+#define bit_is_high_p(reg_p, bit) read_bit_p(reg_p, bit)
+#define bit_is_low_p(reg_p, bit)  (!read_bit_p(reg_p, bit))
+
+// Write value to a bit in pointee
+#define write_bit_p(reg_p, bit, value) do { *(reg_p) = (*(reg_p) & ~(1 << ((uint8_t)(bit) & 0x1))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } while(0)
+#define set_bit_p(reg_p, bit, value)     write_bit_p(reg_p, bit, value)
+#define toggle_bit_p(reg_p, bit)       do { *(reg_p) ^= (1 << (uint8_t)(bit)); } while(0)
+
+
+// --- Nibble manipulation ---
+
+// Replace nibble in a byte
+#define write_low_nibble(reg, value)  do { (reg) = ((reg) & 0xF0) | ((uint8_t)(value) & 0xF); } while(0)
+#define write_high_nibble(reg, value) do { (reg) = ((reg) & 0x0F) | (((uint8_t)(value) & 0xF) << 4); } while(0)
+
+#define write_low_nibble_p(reg_p, value)  do { *(reg_p) = (*(reg_p) & 0xF0) | ((uint8_t)(value) & 0xF); } while(0)
+#define write_high_nibble_p(reg_p, value) do { *(reg_p) = (*(reg_p) & 0x0F) | (((uint8_t)(value) & 0xF) << 4); } while(0)
+
+
+// --- Range tests ---
+
+// Test if X is within low..high, regardless of bounds order
+#define in_range(x, low, high)  ((((low)  < (high)) && ((x) >= (low) && (x)  < (high))) || (((low) > (high)) && ((x) >= (high) && (x)  < (low))))
+// ..., include greater bound
+#define in_rangei(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (high)) && ((x) >= (high) && (x) <= (low))))
+
+// Test if X in low..high, wrap around ends if needed.
+#define in_range_wrap(x, low, high)  ((((low)  < (high)) && ((x) >= (low) && (x) < (high)))  || (((low) > (high)) && ((x) >= (low) || (x)  < (high))))
+// ..., include upper bound
+#define in_range_wrapi(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (high)) && ((x) >= (low) || (x) <= (high))))

projects/rgb_random_wander/lib/loops.h

@@ -0,0 +1,22 @@
+#pragma once
+
+/**
+  Custom loops
+*/
+
+// Repeat code n times (uint8_t counter)
+#define repeat(count) repeat_aux(count, _repeat_##__COUNTER__)
+#define repeat_aux(count, cntvar) for (uint8_t cntvar = 0; cntvar < (count); cntvar++)
+
+// Repeat code n times (uint16_t counter)
+#define repeatx(count) repeatx_aux(count, _repeatx_##__COUNTER__)
+#define repeatx_aux(count, cntvar) for (uint16_t cntvar = 0; cntvar < (count); cntvar++)
+
+// Repeat with custom counter name (uint8_t)
+#define loop(var, count) repeat_aux(count, var)
+// ..., uint16_t
+#define loopx(var, count) repeatx_aux(count, var)
+
+// Do until condition is met
+#define until(what) while(!(what))
+

projects/rgb_random_wander/lib/meta.h

@@ -0,0 +1,6 @@
+#pragma once
+
+/** Weird constructs for the compiler */
+
+// general macros
+#define SECTION(pos) __attribute__((naked, used, section(pos)))

projects/rgb_random_wander/lib/nsdelay.h

@@ -0,0 +1,21 @@
+#pragma once
+
+/**
+  Functions for precise delays (nanoseconds / cycles)
+*/
+
+#include <avr/io.h>
+#include <util/delay_basic.h>
+#include <stdint.h>
+
+/* Convert nanoseconds to cycle count */
+#define ns2cycles(ns)  ( (ns) / (1000000000L / (signed long) F_CPU) )
+
+/** Wait c cycles */
+#define delay_c(c)  (((c) > 0) ? __builtin_avr_delay_cycles(c) :  __builtin_avr_delay_cycles(0))
+
+/** Wait n nanoseconds, plus c cycles  */
+#define delay_ns_c(ns, c)  delay_c(ns2cycles(ns) + (c))
+
+/** Wait n nanoseconds  */
+#define delay_ns(ns)  delay_c(ns2cycles(ns))

projects/rgb_random_wander/lib/pins.h

@@ -0,0 +1,107 @@
+#pragma once
+
+/**
+  This file provides macros for pin manipulation.
+
+  You can define your application pins like so:
+
+      // Led at PORTB, pin 1
+      #define LED B,1
+
+      // Switch at PORTD, pin 7
+      #define SW1 D,7
+
+  Now you can use macros from this file to wirh with the pins, eg:
+
+      as_output(LED);
+      as_input(SW1);
+      pullup_on(SW1);
+
+      toggle_pin(LED);
+      while (pin_is_low(SW1));
+
+  - The macros io2XXX() can be used to get literal name of register associated with the pin.
+  - io2n() provides pin number.
+  - The XXX_aux() macros are internal and should not be used elsewhere.
+  - The io_pack() macro is used to pass pin (io) to other macro without expanding it.
+*/
+
+#include <avr/io.h>
+#include "calc.h"
+
+
+// Get particular register associated with the name X (eg. D -> PORTD)
+#define reg_ddr(X) DDR ## X
+#define reg_port(X) PORT ## X
+#define reg_pin(X) PIN ## X
+
+#define io2ddr_aux(reg, bit) reg_ddr(reg)
+#define io2ddr(io) io2ddr_aux(io)
+#define io2port_aux(reg, bit) reg_port(reg)
+#define io2port(io) io2port_aux(io)
+#define io2pin_aux(reg, bit) reg_pin(reg)
+#define io2pin(io) io2pin_aux(io)
+#define io2n_aux(reg, bit) bit
+#define io2n(io) io2n_aux(io)
+
+#define io_pack(port, bit) port, bit
+
+
+// pointer to port
+typedef volatile uint8_t* PORT_P;
+// number of bit in port
+typedef uint8_t BIT_N;
+
+
+// === pin manipulation ===
+#define set_pin_aux(port, bit) sbi(reg_port(port), (bit))
+#define clear_pin_aux(port, bit) cbi(reg_port(port), (bit))
+#define read_pin_aux(port, bit) get_bit(reg_pin(port), (bit))
+#define write_pin_aux(port, bit, value) set_bit(reg_port(port), (bit), (value))
+#define toggle_pin_aux(port, bit) sbi(reg_pin(port), (bit))
+
+
+#define pin_up(io) set_pin_aux(io)
+#define pin_high(io) set_pin_aux(io)
+
+#define pin_down(io) clear_pin_aux(io)
+#define pin_low(io) clear_pin_aux(io)
+
+#define get_pin(io) read_pin_aux(io)
+#define read_pin(io) read_pin_aux(io)
+
+#define pin_is_low(io) !read_pin_aux(io)
+#define pin_is_high(io) read_pin_aux(io)
+
+#define set_pin(io, value) write_pin_aux(io, (value))
+#define write_pin(io, value) write_pin_aux(io, (value))
+#define toggle_pin(io) toggle_pin_aux(io)
+
+
+
+// setting pin direction
+#define as_input_aux(port, bit) cbi(reg_ddr(port), (bit))
+#define as_output_aux(port, bit) sbi(reg_ddr(port), (bit))
+#define set_dir_aux(port, bit, dir) write_bit(reg_ddr(port), (bit), (dir))
+
+
+#define as_input(io) as_input_aux(io)
+#define as_input_pu(io) do { as_input_aux(io); pullup_enable_aux(io); } while(0)
+
+#define as_output(io) as_output_aux(io)
+#define set_dir(io, dir) set_dir_aux(io, (dir))
+
+
+// setting pullup
+#define pullup_enable_aux(port, bit) sbi(reg_port(port), (bit))
+#define pullup_disable_aux(port, bit) cbi(reg_port(port), (bit))
+#define set_pullup_aux(port, bit, on) write_bit(reg_port(port), (bit), (on))
+
+
+#define pullup_enable(io) pullup_enable_aux(io)
+#define pullup_on(io) pullup_enable_aux(io)
+
+#define pullup_disable(io) pullup_disable_aux(io)
+#define pullup_off(io) pullup_disable_aux(io)
+
+#define set_pullup(io, on) set_pullup_aux(io, on)

projects/rgb_random_wander/lib/ws_rgb.h

@@ -0,0 +1,98 @@
+#pragma once
+
+/**
+  Utils for driving a WS28xx (tested on WS2812B) RGB LED strips.
+
+  It's implemented as macros to avoid overhead when passing values, and to
+  enable driving multiple strips at once.
+
+  To avoid bloating your code, try to reduce the number of invocations -
+  compute color and then send it.
+
+  [IMPORTANT]
+
+  Some seemingly random influences can ruin the communication.
+  If you have enough memory, consider preparing the colors in array,
+  and sending this array using one of the "ws_send_XXX_array" macros.
+
+*/
+
+#include <avr/io.h>
+
+#include "pins.h"
+#include "nsdelay.h"
+#include "colors.h"
+
+/* Driver code for WS2812B */
+
+// --- timing constraints (NS) ---
+
+#ifndef WS_T_1H
+# define WS_T_1H  700
+#endif
+
+#ifndef WS_T_1L
+# define WS_T_1L  150
+#endif
+
+#ifndef WS_T_0H
+# define WS_T_0H  150
+#endif
+
+#ifndef WS_T_0L
+# define WS_T_0L  700
+#endif
+
+#ifndef WS_T_LATCH
+# define WS_T_LATCH 7000
+#endif
+
+
+/** Wait long enough for the colors to show */
+#define ws_show() do {delay_ns_c(WS_T_LATCH, 0); } while(0)
+
+
+/** Send one byte to the RGB strip */
+#define ws_send_byte(io, bb) do {										\
+	for (volatile int8_t __ws_tmp = 7; __ws_tmp >= 0; --__ws_tmp) {		\
+		if ((bb) & (1 << __ws_tmp)) {									\
+			pin_high(io_pack(io)); delay_ns_c(WS_T_1H, -2);				\
+			pin_low(io_pack(io)); delay_ns_c(WS_T_1L, -10);				\
+		} else {														\
+			pin_high(io_pack(io)); delay_ns_c(WS_T_0H, -2);				\
+			pin_low(io_pack(io)); delay_ns_c(WS_T_0L, -10);				\
+		}																\
+	}																	\
+} while(0)
+
+
+/** Send R,G,B color to the strip */
+#define ws_send_rgb(io, r, g, b) do {			\
+	ws_send_byte(io_pack(io), g);				\
+	ws_send_byte(io_pack(io), r);				\
+	ws_send_byte(io_pack(io), b);				\
+} while(0)
+
+/** Send a RGB struct */
+#define ws_send_xrgb(io, xrgb) ws_send_rgb(io_pack(io), (xrgb).r, (xrgb).g, (xrgb).b)
+
+/** Send color hex */
+#define ws_send_rgb24(io, rgb) ws_send_rgb(io_pack(io), rgb24_r(rgb), rgb24_g(rgb), rgb24_b(rgb))
+#define ws_send_rgb15(io, rgb) ws_send_rgb(io_pack(io), rgb15_r(rgb), rgb15_g(rgb), rgb15_b(rgb))
+#define ws_send_rgb12(io, rgb) ws_send_rgb(io_pack(io), rgb12_r(rgb), rgb12_g(rgb), rgb12_b(rgb))
+#define ws_send_rgb6(io, rgb)  ws_send_rgb(io_pack(io), rgb6_r(rgb),  rgb6_g(rgb),  rgb6_b(rgb))
+
+/** Send array of colors */
+#define ws_send_xrgb_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), xrgb)
+#define ws_send_rgb24_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb24)
+#define ws_send_rgb15_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb15)
+#define ws_send_rgb12_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb12)
+#define ws_send_rgb6_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb6)
+
+// prototype for sending array. it's ugly, sorry.
+#define __ws_send_array_proto(io, rgbs, length, style) do {								\
+	for (uint8_t __ws_tmp_sap_i = 0; __ws_tmp_sap_i < length; __ws_tmp_sap_i++) {		\
+		style ## _t __ws_tmp_sap2 = (rgbs)[__ws_tmp_sap_i];								\
+		ws_send_ ## style(io_pack(io), __ws_tmp_sap2);									\
+	}																					\
+} while(0)

projects/rgb_random_wander/main.c

@@ -74,7 +74,7 @@ void update_cell(cell_t* cell)
 
 void main()
 {
-	#define LEN 8
+	#define LEN 16
 	cell_t rainbow[LEN];
 
 	for(uint8_t i=0; i<LEN; i++) {