first commit

vertical line at about 1/3 of the horizontal line

.gitignore

@@ -0,0 +1,4 @@
+build/
+datasheet/
+output/
+

Makefile

@@ -0,0 +1,217 @@
+# Name of the project
+PROJ_NAME   = video
+
+## Directories ##
+# This is where the source files are located,
+# which are not in the current directory
+SRC_DIR       = ./src
+
+# The header files we use are located here
+INC_DIR   =  ./inc
+INC_DIR  +=  ./src
+INC_DIR  +=  .
+
+BUILD_DIR     = build
+OUTPUT_DIR    = output
+
+######################################################################
+#                             SOURCES                                #
+######################################################################
+
+## FILES ##
+# c files
+# SRCS        =
+SRCS		+= main.c
+
+# asm files
+# S maiuscola! Invoca prima il compilatore gcc che interpreta macro e altro
+# ASRC       = main.S
+ASRC 		+= main.S
+#ASRC 		+= video.S
+#ASRC 		+= sleep.S
+# ASRC 		+= variables.S
+#ASRC 		+= lines/line_white.S
+#ASRC 		+= lines/line_black.S
+#ASRC 		+= lines/line_mid.S
+#ASRC 		+= lines/line_syncs.S
+#ASRC 		+= lines/line_calc.S
+# ASRC 		+= lines/line_digits.S
+
+# header files
+# Specify here libraries! Makefile will check existance before launching
+# DEPS       = $(notdir $(wildcard $(INC_DIR)/*.h))
+# DEPS      += Makefile
+# DEPS      += $(ENUMSTRING)
+
+# Object files
+# Automatically declares object file names
+OBJS          = $(patsubst %.c,   $(BUILD_DIR)/%.c.o,  $(filter %.c,$(SRCS)) )
+OBJS         += $(patsubst %.cpp, $(BUILD_DIR)/%.cpp.o,$(filter %.cpp,$(SRCS)) )
+
+# Dependencies from .h/.hpp files, but exclude asm files
+DEPS         := $(patsubst %.o, %.d, $(OBJS))
+
+OBJS         += $(patsubst %.s,   $(BUILD_DIR)/%.s.o,  $(filter %.s,$(ASRC)) )
+OBJS         += $(patsubst %.S,   $(BUILD_DIR)/%.S.o,  $(filter %.S,$(ASRC)) )
+
+
+# Virtual Paths
+# Tell make to look in that folder if it cannot find a source
+# in the current directory
+vpath %.c   $(SRC_DIR)
+vpath %.cpp $(SRC_DIR)
+vpath %.S   $(SRC_DIR)
+vpath %.h   $(INC_DIR)
+
+######################################################################
+#                         SETUP TOOLS                                #
+######################################################################
+ECHO      := /bin/echo
+
+# GCC/programming Tools
+CC         = avr-gcc
+CXX        = avr-g++
+OBJCOPY    = avr-objcopy
+OBJDUMP    = avr-objdump
+GDB        = avr-gdb
+AS         = avr-as
+SIZE       = avr-size
+AVRDUDE	   = avrdude
+# Custom script for enum parsing
+# PACK2STRING = python3 bin/enum2string.py
+
+# Microcontroller
+MCU        = atmega328p
+F_CPU      = 16000000
+# Fuses -- www.engbedded.com/fusecalc/
+LFUSE			 = 0xfd
+HFUSE			 = 0xde
+
+### GCC options ###
+
+## Compiler flags ##
+# Do not run the linker
+CFLAGS    += -c
+# Debug informations
+CFLAGS    += -g
+# Auto optimisation
+CFLAGS    += -Os
+# All warning messages
+CFLAGS    += -Wall -Wextra
+# Puts functions and data into its own section - remove thread-safe things
+CFLAGS    += -fno-exceptions -fstack-usage -fdump-tree-optimized -ffunction-sections -fdata-sections -fno-threadsafe-statics
+# Use smallest size for enums
+CFLAGS    += -fshort-enums
+# Microcontroller
+CFLAGS    += -mmcu=$(MCU)
+# Clock speed
+CFLAGS    += -DF_CPU=$(F_CPU)L
+# Header files
+CFLAGS    += $(addprefix -I,$(INC_DIR))
+CFLAGS    += -flto
+# CFLAGS    += -DAVR
+# Debug Flag
+# CFLAGS    += -DDEBUG
+
+## CXX flags are the same as CC ones here!
+CXXFLAGS  = $(CFLAGS)
+CXXFLAGS += -std=c++11
+
+# Linker flags
+LFLAGS     = -mmcu=$(MCU)
+LFLAGS    += $(addprefix -I,$(INC_DIR))
+
+######################################################################
+#                      PROGRAMMING TOOLS                             #
+######################################################################
+# To match MCU with BOARD, see link
+# http://www.nongnu.org/avr-libc/user-manual/using_tools.html
+#PROGRAMMER = avrispmkii
+PROGRAMMER = usbasp
+# verbose
+# PROGRAM_FLAGS =  -v
+# erase
+# PROGRAM_FLAGS =  -e
+# choose programmer
+PROGRAM_FLAGS += -c $(PROGRAMMER)
+# target cpu
+PROGRAM_FLAGS += -p $(MCU)
+# USB port and baudrate
+# PROGRAM_FLAGS += -P /dev/ttyACM0
+
+######################################################################
+#                             TARGETS                                #
+######################################################################
+.PHONY: clean
+
+all:     $(OUTPUT_DIR)/$(PROJ_NAME).hex
+
+-include $(DEPS)
+
+# invokes CC compiler before assemblying
+$(BUILD_DIR)/%.S.o : %.S
+	@echo -e "\033[1;33m[Assembling  ]\033[0m AS $<"
+	@mkdir -p `dirname $@`
+	$(CC) $(CFLAGS) $< -o $@
+
+# pure asm
+$(BUILD_DIR)/%.s.o : %.s
+	@echo -e "\033[1;33m[Assembling  ]\033[0m AS $<"
+	@mkdir -p `dirname $@`
+	$(CC) $(CFLAGS) $< -o $@
+
+# .cxx files
+$(BUILD_DIR)/%.cpp.o:  %.cpp
+	@echo -e "\033[1;33m[Compiling   ]\033[0m CX $<"
+	@mkdir -p `dirname $@`
+	$(CXX) $(CXXFLAGS) $< -o $@
+
+# .c files
+$(BUILD_DIR)/%.c.o:  %.c
+	@echo -e "\033[1;33m[Compiling   ]\033[0m CC $<"
+	@mkdir -p `dirname $@`
+	$(CC) $(CFLAGS) $< -o $@
+
+.DELETE_ON_ERROR:
+$(BUILD_DIR)/%.c.d: %.c
+	@mkdir -p `dirname $@`
+	@$(ECHO) -n "$@ " > $@
+	@$(CC) -MM -MT '$(@D)/$(<F).o' $(CFLAGS) $< >> $@
+
+.DELETE_ON_ERROR:
+$(BUILD_DIR)/%.cpp.d: %.cpp
+	@mkdir -p `dirname $@`
+	@$(ECHO) -n "$@ " > $@
+	@$(CC) -MM -MT '$(@D)/$(<F).o' $(CFLAGS) $< >> $@
+
+# $(ENUMSTRING): $(STRINGFILES)
+# 	$(PACK2STRING) $^ > $(ENUMSTRING)
+
+$(OUTPUT_DIR)/$(PROJ_NAME).elf: $(OBJS)
+	@echo -e "\033[1;34m[Linking     ]\033[0m $@"
+	@mkdir -p ${OUTPUT_DIR}
+	$(CC) $(LFLAGS) -o $@ $(foreach file, $^, $(file)) -lm
+	@echo -e "\033[1;35m[Disasm...   ]\033[0m $^"
+	$(OBJDUMP) -h -S $@ > $(OUTPUT_DIR)/$(PROJ_NAME).lss
+
+$(OUTPUT_DIR)/$(PROJ_NAME).hex: $(OUTPUT_DIR)/$(PROJ_NAME).elf
+	@echo -e "\033[1;36m[Binary      ]\033[0m $^"
+	$(OBJCOPY) -O ihex -R .eeprom $^ $@
+
+size: $(OUTPUT_DIR)/$(PROJ_NAME).elf
+	$(SIZE) -C --mcu=$(MCU) $(OUTPUT_DIR)/$(PROJ_NAME).elf
+
+flash:		$(OUTPUT_DIR)/$(PROJ_NAME).hex
+	$(AVRDUDE) $(PROGRAM_FLAGS) -U flash:w:$(OUTPUT_DIR)/$(PROJ_NAME).hex
+
+fuse:			$(OUTPUT_DIR)/$(PROJ_NAME).hex
+	$(AVRDUDE) $(PROGRAM_FLAGS) -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m
+
+test:
+	$(AVRDUDE) $(PROGRAM_FLAGS)
+
+clean:
+	@echo -e "\033[1;33m[Cleaning   ]\033[0m"
+	@rm -rf $(BUILD_DIR)/*
+	@rm -rf $(OUTPUT_DIR)/*
+

macro.h

@@ -0,0 +1 @@
+#define IO(x) x - 0x20

main.S

@@ -0,0 +1,89 @@
+#include <avr/io.h>
+#include "macro.h"
+
+.data
+status:
+.byte 0x0
+
+.text
+
+.global main_s
+main_s:
+    ldi r16, 0x30
+    sts DDRB, r16
+
+    ldi r16, (1 << IVCE)    ; set vector at address 0x0
+    ldi r17, 0
+    out IO(MCUCR), r16
+    out IO(MCUCR), r17
+
+    ldi r16, 0x3        ; enable falling edge interrupt 0
+    sts EICRA, r16
+
+    ldi r16, 0x1        ; external interrupt mask enable
+    sts EIMSK, r16
+
+    sei
+
+again:
+    sbi IO(PORTB), 5
+    ldi r16, 0x1
+    sts status, r16
+
+wait1:
+    ldi r16, 0xff
+    ldi r17, 0xff
+    ldi r18, 0xff
+
+1:
+    dec r16
+    brne 1b
+    dec r17
+    brne 1b
+    dec r18
+    brne 1b
+
+    cbi IO(PORTB), 5
+    ldi r16, 0x0
+    sts status, r16
+
+wait2:
+    ldi r16, 0xff
+    ldi r17, 0xff
+    ldi r18, 0xff
+
+1:
+    dec r16
+    brne 1b
+    dec r17
+    brne 1b
+    dec r18
+    brne 1b
+
+    jmp again
+
+.global int0_handler
+int0_handler:
+    ldi r31, 80
+loop:
+    dec r31
+    brne loop
+
+    lds r31, status
+    cpi r31, 1
+    brne 1f
+    sbi IO(PORTB), 4
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    nop
+    cbi IO(PORTB), 4
+1:
+
+    ret

main.c

@@ -0,0 +1,13 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void main_s(void);
+void int0_handler(void);
+
+ISR(INT0_vect) {
+    int0_handler();
+}
+
+int main() {
+    main_s();
+}