--- /dev/null
+target remote :1234
+layout split
+stepi
+quit
+target remote :1234
+layout split
+stepi
+b *main+9
+quit
--- /dev/null
+set history save on
+set history size 1000
+set history remove-duplicates 2
+set history filename .gdb_history
+
--- /dev/null
+.depend
+**/build
+**/dist
+**/sim
--- /dev/null
+{
+ "configurations": [
+ {
+ "name": "Linux AVR",
+ "includePath": [
+ "/usr/lib/avr/include/**",
+ "/usr/lib/gcc/avr/**"
+ ],
+ "defines": [],
+ "compilerPath": "/usr/bin/avr-gcc",
+ "compilerArgs": [
+ "-mmcu=atmega644p",
+ "-Os",
+ "-DF_CPU=12000000",
+ "-DBAUD_RATE=115200",
+ "-DDOUBLE_SPEED",
+ "-DNUM_LED_FLASHES=4",
+ "-DMAX_TIME_COUNT=F_CPU>>4"
+ ],
+ "cStandard": "gnu11",
+ "cppStandard": "gnu++11",
+ "intelliSenseMode": "linux-gcc-x64"
+ }
+ ],
+ "version": 4
+}
--- /dev/null
+{
+ // Use IntelliSense to learn about possible attributes.
+ // Hover to view descriptions of existing attributes.
+ // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+ "version": "0.2.0",
+ "configurations": [
+ {
+ "name": "Build",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "build"
+ },{
+ "name": "Flash",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "flash"
+ },{
+ "name": "Clean",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "clean"
+ },{
+ // es muss mit simuc --board arduino dist/programm.elf der Simulator
+ // gestartet werden. Dessen gdb-stub öffnet auf localhost:1234 einen Port
+ "name": "Debug (simuc)",
+ "type": "cppdbg",
+ "request": "launch",
+ "program": "${workspaceFolder}/sim/atmega328p.elf",
+ "cwd": "${workspaceFolder}",
+ "externalConsole": false,
+ "MIMode": "gdb",
+ "miDebuggerPath": "/usr/bin/avr-gdb",
+ "miDebuggerServerAddress": ":1234",
+ "preLaunchTask": "build"
+ }
+ ]
+}
--- /dev/null
+{
+ "[c]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "[h]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "cSpell.words": [],
+ "cSpell.ignorePaths": [
+ "**/*.json", "**/*.c", "**/*.h", "**/Makefile"
+ ],
+ "files.associations": {
+ "delay.h": "c",
+ "boot.h": "c",
+ "stdio.h": "c"
+ }
+}
--- /dev/null
+{
+ // See https://go.microsoft.com/fwlink/?LinkId=733558
+ // for the documentation about the tasks.json format
+ "version": "2.0.0",
+ "tasks": [{
+ "label": "build",
+ "type": "shell",
+ "command": "make",
+ "problemMatcher":[
+ "$gcc"
+ ]
+ },{
+ "label": "clean",
+ "type": "shell",
+ "command": "make",
+ "args": [ "clean" ],
+ },{
+ "label": "flash",
+ "type": "shell",
+ "command": "make",
+ "args": [ "flash" ],
+ }]
+}
\ No newline at end of file
--- /dev/null
+.PHONY: all info flash picocom clean
+$(shell mkdir -p dist >/dev/null)
+$(shell mkdir -p build >/dev/null)
+$(shell mkdir -p sim >/dev/null)
+
+NAME="bootloader-arduino_nano-644"
+DEVICE="atmega644p"
+SRC= $(wildcard src/*.c)
+OBJ = $(SRC:src/%.c=build/%.o)
+OBJ_SIM = $(SRC:src/%.c=sim/%.o)
+
+CC= avr-gcc
+CFLAGS_DEFINES= -DF_CPU=12000000 -DBAUD_RATE=115200 -DDOUBLE_SPEED -DNUM_LED_FLASHES=4 '-DMAX_TIME_COUNT=F_CPU>>4'
+LFLAGS_DEFINES= -DF_CPU=12000000
+CFLAGS= -Wall -mmcu=$(DEVICE) -Os $(CFLAGS_DEFINES) -c
+LFLAGS= -Wall -mmcu=$(DEVICE) -Os $(LFLAGS_DEFINES) -Wl,--section-start=.text=0xe000
+
+CFLAGS_SIM= -Wall -mmcu=$(DEVICE) -O1 $(CFLAGS_DEFINES) -g -c
+LFLAGS_SIM= -Wall -mmcu=$(DEVICE) -O1 $(LFLAGS_DEFINES) -g -Wl,--section-start=.text=0xe000
+
+
+all: dist/$(NAME).elf dist/$(NAME).s dist/$(NAME).hex sim/$(NAME).elf sim/$(NAME).s info
+
+info:
+ @echo
+ @avr-size --mcu=$(DEVICE) --format=avr dist/$(NAME).elf
+
+.depend: $(SRC)
+ $(CC) -mmcu=$(DEVICE) -MM $(SRC) > .depend
+
+-include $(DEPENDFILE)
+
+dist/$(NAME).elf: .depend $(OBJ)
+ $(CC) $(LFLAGS) -o $@ $(OBJ)
+
+dist/%.s: dist/%.elf
+ avr-objdump -d $< > $@
+
+dist/%.hex: dist/%.elf
+ avr-objcopy -j .text -j .data -O ihex $< $@
+
+sim/$(NAME).elf: .depend $(OBJ_SIM)
+ $(CC) $(LFLAGS_SIM) -o $@ $(OBJ_SIM)
+
+build/%.o: src/%.c
+ $(CC) $(CFLAGS) -o $@ $<
+
+sim/%.o: src/%.c
+ $(CC) $(CFLAGS_SIM) -o $@ $<
+
+sim/%.s: sim/%.elf
+ avr-objdump -d $< > $@
+
+simuc: sim/$(NAME).elf
+ simuc --board arduino $<
+
+gdb: sim/$(NAME).elf
+ avr-gdb $<
+
+picocom:
+ # picocom sends CR for ENTER -> convert cr (\r) to lf (\n)
+ picocom -b 115200 --omap crlf /dev/ttyUSB0
+
+flash: dist/$(NAME).elf all
+ avrdude -c arduino -P /dev/ttyUSB0 -p m644p -e -U flash:w:$<
+
+isp:
+ avrdude -c usbasp -p m644p -U lock:r:-:h
+
+isp-flash: dist/$(NAME).elf all
+ avrdude -c usbasp -p m644p -e -U flash:w:$<
+
+isp-read:
+ avrdude -c usbasp -p m644p -U flash:r:/tmp/flash.bin
+
+isp-erase:
+ avrdude -c usbasp -p m644p -e
+
+isp-fuse:
+ #avrdude -c usbasp -p m644p -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFF:m -U lock:w:0xFF:m
+ avrdude -c usbasp -p m644p -U lfuse:w:0xFF:m -U hfuse:w:0xD8:m -U efuse:w:0xFE:m -U lock:w:0xEF:m
+
+clean:
+ @rm -r dist
+ @rm -r build
+ @rm -r sim
+ @find . -type f -name ".depend" -exec rm {} \;
+ @echo "clean done"
--- /dev/null
+# Arduino-Bootloader (STK500) für Nano-644
+
+Dieser Bootloader ermöglicht die Programmierung über das "Arduino-System". Als Kommunikationsprotokoll kommt das [STK500 Protokoll]( https://www.microchip.com/content/dam/mchp/documents/OTH/ApplicationNotes/ApplicationNotes/doc2525.pdf) zur Anwendung (Kommunikationsablauf siehe Datei [protocol](protocol)).
+
+Beim Bootloader in [src/main.c](src/main.c) handelt es sich um eine Anpassung von [https://github.com/arduino/ArduinoCore-avr/blob/master/bootloaders/atmega/ATmegaBOOT_168.c](https://github.com/arduino/ArduinoCore-avr/blob/master/bootloaders/atmega/ATmegaBOOT_168.c) an die Hardware des Nano-644 Boards.
+
+Diese Anpassung der Quelltext-Datei umfasst:
+* Microcontroller Atmega644P (mit 64KiB Flash, davon die hinteren 8KiB für den Bootloader)
+* Frequenz 12MHz
+* 3 LEDs (rot, gelb, grün)
+* Assembler-Anweisungen durch Macros aus `avr/boot.h` ersetzt
+* Quelltextkorrekturen, damit der Bootloader auch bei einer Page-Size von 256 Byte funktioniert
+
+Der Bootloader kann entweder selbst aus der Quelltextdatei erzeugt werden (siehe [Übersetzung](#%C3%BCbersetzung)), oder es wird eine der bereits fertigen Dateien im Ordner [release](release) verwendet:
+* [release/bootloader-arduino_nano-644.elf](release/bootloader-arduino_nano-644.elf)
+* [release/bootloader-arduino_nano-644.hex](release/bootloader-arduino_nano-644.hex)
+
+## Übersetzung
+
+Folgende Tools sind erforderlich:
+* avr-gcc
+* avrdude
+
+Auf einem Linux-Debian System müssen daher folgende Pakete installiert sein:
+```sh
+sudo apt update
+sudo apt install gcc-avr avr-libc binutils-avr avrdude
+```
+
+Die Übersetzung erfolgt dann mit dem Kommando `make`.
+
+## Download auf den µC
+
+Die korrekte Programmierung der Fuses sowie der Download des Bootloaders in den Bootloader-Bereich des µC-Flash kann mit Hilfe eines [USBasp-Programmiergeräts](https://www.fischl.de/usbasp/) mit folgenden Kommandos erfolgen:
+
+```sh
+make isp-fuse
+make isp-flash
+```
+
+Nach der Programmierung sollten die drei LEDs den Start des Bootloader anzeigen (rot -> rot+orange -> grün -> grün blinken).
+
+
+## Download von Programmen mit Hilfe des Bootloaders
+
+Sobald sich am µC ein Bootloader befindet ist kein Programmiergerät mehr erforderlich. Das Programm wird über die serielle UART-Schnittstelle (via USB-Schnittstelle) in den Flash gespeichert.
+
+UART-Schnittstelle (Option `-P`) und Name der ELF-Programmdatei (nach `flash:w:`) sind anzupassen...
+
+```sh
+avrdude -c arduino -p m644p -P /dev/ttyUSB0 -b 115200 -e -U flash:w:programm.elf
+```
+
+## Einbindung in die Arduino IDE
+
+Zunächst den Ordner mit der Arduino Installation finden. Unter Linux ist das der Pfad:
+```
+/usr/share/arduino/hardware/arduino/avr
+```
+
+Dort im Unterordner `bootloaders` einen Ordner `atmeg644` anlegen und darin die Intel-Hex Datei des Bootloaders ablegen.
+
+```sh
+make
+sudo mkdir /usr/share/arduino/hardware/arduino/avr/bootloaders/atmega644
+cp dist/bootloader-arduino_nano-644.hex /usr/share/arduino/hardware/arduino/avr/bootloaders/atmega644/
+```
+
+Danach in der Datei `/usr/share/arduino/hardware/arduino/avr/boards.txt` folgende Einträge ergänzen:
+```
+#########################################################
+
+nano644.name=Nano-644
+
+nano644.vid.0=0x1a86
+nano644.pid.0=0x7522
+nano644.upload_port.0.vid=0x1a86
+nano644.upload_port.0.pid=0x7522
+
+nano644.upload.tool=avrdude
+nano644.upload.tool.default=avrdude
+nano644.upload.tool.network=arduino_ota
+nano644.upload.protocol=arduino
+nano644.upload.maximum_size=57344
+nano644.upload.maximum_data_size=4096
+nano644.upload.speed=115200
+
+nano644.bootloader.tool=avrdude
+nano644.bootloader.tool.default=avrdude
+nano644.bootloader.low_fuses=0xFF
+nano644.bootloader.high_fuses=0xD8
+nano644.bootloader.extended_fuses=0xFF
+nano644.bootloader.unlock_bits=0xFE
+nano644.bootloader.lock_bits=0xEF
+nano644.bootloader.file=atmega644/bootloader-arduino_nano-644.hex
+
+nano644.build.mcu=atmega644p
+nano644.build.f_cpu=12000000L
+nano644.build.board=AVR_NANO644
+nano644.build.core=arduino
+nano644.build.variant=standard
+
+##############################################################
+```
+
+Nach dem Start der Arduino-IDE kann:
+* über das Menü *Werkzeuge->Board* das ***Nano-644*** gewählt werden
+* über das Menü *Werkzeuge->Programmer* der ***ArduinoISP*** gewählt werden
+
--- /dev/null
+ 0.552750 --> 2: 3020
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+
+ 1.057514 --> 3: 4181 20
+ 1.060837 <-- 3: 1401 10
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+
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+
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+:10E4C0006881860F911D0C0100935700E895112477\r
+:10E4D0002E5F3F4F22962115F1E03F0751F7309311\r
+:10E4E0000A0220930902FA01F0925700E89507B654\r
+:10E4F00000FCFDCFE0925700E89584E164C08437CA\r
+:10E5000009F051C00E946D70809308020E946D70E6\r
+:10E51000809307028091040190910501880F991F53\r
+:10E5200090930501809304010E946D7090910B02FD\r
+:10E53000853411F4916001C09E7F90930B020E947C\r
+:10E540006D70803209F041C084E10E945270C0E0D9\r
+:10E55000D0E08091070290910802C817D907A8F56A\r
+:10E5600080910B0280FF0BC0F999FECF80910401CE\r
+:10E570009091050192BD81BDF89A80B507C081FDDB\r
+:10E5800007C0E0910401F091050184910E9452704E\r
+:10E59000809104019091050101969093050180936B\r
+:10E5A00004012196D6CF853719F50E946D7080320F\r
+:10E5B00081F484E10E9452708EE10E94527086E9DB\r
+:10E5C0000E9452708AE00E94527080E10E94527054\r
+:10E5D0006CCE809102018F5F80930201853009F437\r
+:10E5E00017B818B8E0910001F091010109955DCECE\r
+:0CE5F000863709F05ACED7CEF894FFCF42\r
+:040000030000E00019\r
+:00000001FF\r
--- /dev/null
+/*************************************************************************************************/
+/* Serial Bootloader for Atmel megaAVR Controllers */
+/* */
+/* Source-code taken from: */
+/* https://github.com/arduino/ArduinoCore-avr/blob/master/bootloaders/atmega/ATmegaBOOT_168.c */
+/* Branch@hash: master@321fca0b */
+/* */
+/* Licence can be viewed at http://www.fsf.org/licenses/gpl.txt */
+/* */
+/*************************************************************************************************/
+
+#include <inttypes.h>
+
+#include <avr/boot.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+// #include <util/delay.h>
+
+// #define DEBUG_UART1
+#ifdef DEBUG_UART1
+ #include <stdio.h>
+#endif
+
+// after this many errors give up and launch application
+#define MAX_ERROR_COUNT 5
+
+#define HW_VER 0xF1
+#define SW_MAJOR 0x01
+#define SW_MINOR 0x10
+
+// onboard LED is used to indicate, that the bootloader was entered
+#define SET_LED_RED (PORTC |= (1 << PC2))
+#define CLR_LED_RED (PORTC &= ~(1 << PC2))
+#define SET_LED_ORANGE (PORTC |= (1 << PC3))
+#define CLR_LED_ORANGE (PORTC &= ~(1 << PC3))
+#define SET_LED_GREEN (PORTC |= (1 << PC4))
+#define CLR_LED_GREEN (PORTC &= ~(1 << PC4))
+
+// define various device id's
+// manufacturer byte is always the same
+#define SIG1 0x1E // Yep, Atmel is the only manufacturer of AVR micros. Single source :(
+#define SIG2 0x96
+#define SIG3 0x0A
+#define PAGE_SIZE 0x80U // 128 words
+
+// function prototypes
+void putch(char);
+char getch(void);
+void getNch(uint8_t);
+void byte_response(uint8_t);
+void nothing_response(void);
+char gethex(void);
+void puthex(char);
+void flash_led(uint8_t);
+
+#ifdef DEBUG_UART1
+ int uart_putchar(char c, FILE *stream) {
+ if (c == '\n') {
+ uart_putchar('\r', stream);
+ }
+ loop_until_bit_is_set(UCSR1A, UDRE1);
+ UDR1 = c;
+ return 0;
+ }
+
+ static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+#endif
+
+// some variables
+union address_union {
+ uint16_t word;
+ uint8_t byte[2];
+} address;
+
+union length_union {
+ uint16_t word;
+ uint8_t byte[2];
+} length;
+
+struct flags_struct {
+ unsigned eeprom : 1;
+ unsigned rampz : 1;
+} flags;
+
+uint8_t buff[SPM_PAGESIZE + 1];
+// uint8_t address_high;
+// uint8_t pagesz=0x80;
+
+uint16_t i;
+uint8_t bootuart = 0;
+
+uint8_t error_count = 0;
+
+void (*app_start)(void) = 0x0000;
+
+int main () {
+ uint8_t ch, ch2;
+ uint16_t w;
+
+ #ifdef WATCHDOG_MODS
+ ch = MCUSR;
+ MCUSR = 0;
+
+ WDTCSR |= _BV(WDCE) | _BV(WDE);
+ WDTCSR = 0;
+
+ // Check if the WDT was used to reset, in which case we dont bootload and skip straight to the code. woot.
+ if (! (ch & _BV(EXTRF))) // if its a not an external reset...
+ app_start(); // skip bootloader
+ #else
+ asm volatile("nop\n\t");
+ #endif
+
+ // LED ports output and off
+ DDRC = (1 << PC4) | (1 << PC3) |(1 << PC2);
+ PORTC = 0;
+
+ #ifdef DOUBLE_SPEED
+ UCSR0A = (1 << U2X0); // Double speed mode USART0
+ UBRR0L = (uint8_t)(F_CPU / (BAUD_RATE *8L) - 1);
+ UBRR0H = (F_CPU / (BAUD_RATE * 8L) - 1) >> 8;
+ #ifdef DEBUG_UART1
+ UCSR1A = (1 << U2X1); // Double speed mode USART0
+ UBRR1L = (uint8_t)(F_CPU / (BAUD_RATE *8L) - 1);
+ UBRR1H = (F_CPU / (BAUD_RATE * 8L) - 1) >> 8;
+ #endif
+ #else
+ UBRR0L = (uint8_t)(F_CPU / (BAUD_RATE * 16L) - 1);
+ UBRR0H = (F_CPU / (BAUD_RATE*16L)-1) >> 8;
+ #ifdef DEBUG_UART1
+ UBRR1L = (uint8_t)(F_CPU / (BAUD_RATE * 16L) - 1);
+ UBRR1H = (F_CPU / (BAUD_RATE*16L)-1) >> 8;
+ #endif
+ #endif
+
+ UCSR0B = (1<<RXEN0) | (1<<TXEN0);
+ UCSR0C = (1<<UCSZ00) | (1<<UCSZ01);
+ UCSR1B = (1<<TXEN1);
+ UCSR1C = (1<<UCSZ00) | (1<<UCSZ01);
+
+ #ifdef DEBUG_UART1
+ stdout = &mystdout;
+ printf("\n\nArduino-Bootloader\n");
+ #endif
+
+ // flash onboard LED to signal entering of bootloader */
+ flash_led(NUM_LED_FLASHES);
+
+ // forever loop
+ while (1) {
+
+ // get character from UART
+ ch = getch();
+
+ // A bunch of if...else if... gives smaller code than switch...case !
+
+ // Hello is anyone home ?
+ if(ch == '0') {
+ nothing_response();
+
+ } else if (ch == '1') {
+ // Request programmer ID
+ // Not using PROGMEM string due to boot block in m128 being beyond 64kB boundary
+ // Would need to selectively manipulate RAMPZ, and it's only 9 characters anyway so who cares.
+
+ if (getch() == ' ') {
+ putch(0x14);
+ putch('A');
+ putch('V');
+ putch('R');
+ putch(' ');
+ putch('I');
+ putch('S');
+ putch('P');
+ putch(0x10);
+ } else {
+ if (++error_count == MAX_ERROR_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+ }
+
+ } else if (ch == '@') {
+ // AVR ISP/STK500 board commands DON'T CARE so default nothing_response
+ ch2 = getch();
+ if (ch2 > 0x85) getch();
+ nothing_response();
+
+ // *****************************
+ // AVR ISP/STK500 board requests
+ // *****************************
+
+ } else if (ch == 'A') { // 0x41
+ ch2 = getch();
+ if (ch2 == 0x80) {
+ byte_response(HW_VER); // Hardware version
+ } else if (ch2 == 0x81) {
+ byte_response(SW_MAJOR); // Software major version
+ } else if(ch2 == 0x82) {
+ byte_response(SW_MINOR); // Software minor version
+ } else if(ch2==0x98) {
+ byte_response(0x03); // Unknown but seems to be required by avr studio 3.56
+ } else {
+ byte_response(0x00); // Covers various unnecessary responses we don't care about
+ }
+
+ } else if (ch == 'B') { // B: 0x42
+ // Device Parameters DON'T CARE, DEVICE IS FIXED
+ getNch(20);
+ nothing_response();
+
+
+ } else if (ch == 'E') { // E: 0x45
+ // Parallel programming stuff DON'T CARE
+ getNch(5);
+ nothing_response();
+
+ } else if (ch == 'P' || ch == 'R') { // P: 0x50, R: 0x52
+ // P: Enter programming mode
+ // R: Erase device, don't care as we will erase one page at a time anyway.
+ nothing_response();
+
+ } else if (ch == 'Q') { // Q: 0x51
+ // Leave programming mode
+ nothing_response();
+ #ifdef WATCHDOG_MODS
+ // autoreset via watchdog (sneaky!)
+ WDTCSR = _BV(WDE);
+ while (1); // 16 ms
+ #endif
+
+ } else if(ch == 'U') { // U: 0x55
+ // Set address, little endian. EEPROM in bytes, FLASH in words
+ // Perhaps extra address bytes may be added in future to support > 128kB FLASH.
+ // This might explain why little endian was used here, big endian used everywhere else.
+ address.byte[0] = getch();
+ address.byte[1] = getch();
+ nothing_response();
+
+
+ } else if (ch == 'V') { // V: 0x56
+ // Universal SPI programming command, disabled. Would be used for fuses and lock bits.
+ if (getch() == 0x30) {
+ getch();
+ ch = getch();
+ getch();
+ if (ch == 0) {
+ byte_response(SIG1);
+ } else if (ch == 1) {
+ byte_response(SIG2);
+ } else {
+ byte_response(SIG3);
+ }
+ } else {
+ getNch(3);
+ byte_response(0x00);
+ }
+
+ } else if (ch == 'd') { // d: 0x64
+ // Write memory, length is big endian and is in bytes
+ length.byte[1] = getch();
+ length.byte[0] = getch();
+ flags.eeprom = 0;
+ if (getch() == 'E') {
+ flags.eeprom = 1;
+ }
+ for (w = 0; w < length.word; w++) {
+ // Store data in buffer, can't keep up with serial data stream whilst programming pages
+ buff[w] = getch();
+ }
+ if (getch() == ' ') {
+ if (flags.eeprom) {
+ // Write to EEPROM one byte at a time
+ address.word <<= 1;
+ for(w = 0; w < length.word; w++) {
+ while(EECR & (1<<EEPE));
+ EEAR = (uint16_t)address.word;
+ EEDR = buff[w];
+ EECR |= (1<<EEMPE);
+ EECR |= (1<<EEPE);
+ // SX
+ // eeprom_write_byte((void *)address.word,buff[w]);
+ address.word++;
+ }
+ } else {
+ // Write to FLASH one page at a time
+ if (address.byte[1] > 127) {
+ //Only possible with m128, m256 will need 3rd address byte. FIXME
+ // RAMPZ = 0x01;
+ } else {
+ // RAMPZ = 0x00;
+ }
+
+ // address * 2 -> byte location
+ address.word = address.word << 1;
+ if ((length.byte[0] & 0x01)) {
+ // Even up an odd number of bytes
+ length.word++;
+ }
+ cli();
+
+ uint16_t addr = address.word;
+ #ifdef DEBUG_UART1
+ printf("Programming: address=0x%04x length=0x%04x\n", addr, length.word);
+ printf(" eeprom_busy_wait() ...");
+ #endif
+ eeprom_busy_wait();
+ boot_spm_busy_wait();
+ #ifdef DEBUG_UART1
+ printf("done\n");
+ printf(" boot_page_erase(0x%04x)...", address.word);
+ #endif
+ boot_page_erase(addr);
+ boot_spm_busy_wait ();
+ #ifdef DEBUG_UART1
+ printf("done\n");
+ printf(" boot_page_fill(0x%04x, ...): ", address.word);
+ #endif
+ for (i = 0; i < SPM_PAGESIZE; i += 2) {
+ uint16_t w = buff[i] + (buff[i + 1] << 8);
+ #ifdef DEBUG_UART1
+ printf(".");
+ #endif
+ boot_page_fill(addr + i, w);
+ }
+ #ifdef DEBUG_UART1
+ printf("\n boot_page_write(0x%04x)...", address.word);
+ #endif
+ boot_page_write(addr);
+ boot_spm_busy_wait();
+ #ifdef DEBUG_UART1
+ printf("done\n");
+ printf(" boot_rww_enable()\n");
+ #endif
+ boot_rww_enable();
+ }
+ putch(0x14);
+ putch(0x10);
+
+ } else {
+ if (++error_count == MAX_ERROR_COUNT)
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+
+ } else if (ch == 't') { // t: 0x74
+ // Read memory block mode, length is big endian. */
+ length.byte[1] = getch();
+ length.byte[0] = getch();
+ // if (address.word>0x7FFF) flags.rampz = 1; // No go with m256, FIXME
+ // else flags.rampz = 0;
+ address.word = address.word << 1; // address * 2 -> byte location
+ if (getch() == 'E') {
+ flags.eeprom = 1;
+ } else {
+ flags.eeprom = 0;
+ }
+ if (getch() == ' ') {
+ // Command terminator
+ putch(0x14);
+ for (w = 0; w < length.word; w++) {
+ // Can handle odd and even lengths okay
+ if (flags.eeprom) { // Byte access EEPROM read
+ while(EECR & (1<<EEPE));
+ EEAR = (uint32_t)address.word;
+ EECR |= (1<<EERE);
+ putch(EEDR);
+ // putch(eeprom_read_byte((void *)address.word));
+ address.word++;
+ }
+ else {
+ if (!flags.rampz) {
+ putch(pgm_read_byte_near(address.word));
+ // putch(pgm_read_byte_far(address.word + 0x10000));
+ }
+ address.word++;
+ }
+ }
+ }
+ putch(0x10);
+
+ } else if(ch == 'u') { // u: 0x75
+ // Get device signature bytes
+ if (getch() == ' ') {
+ putch(0x14);
+ putch(SIG1);
+ putch(SIG2);
+ putch(SIG3);
+ putch(0x10);
+ } else {
+ if (++error_count == MAX_ERROR_COUNT)
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+
+ } else if (ch == 'v') {
+ // Read oscillator calibration byte
+ byte_response(0x00);
+ }
+
+ }
+}
+
+char gethexnib () {
+ char a;
+ a = getch(); putch(a);
+ if (a >= 'a') {
+ return (a - 'a' + 0x0a);
+ } else if (a >= '0') {
+ return (a - '0');
+ }
+ return a;
+}
+
+
+char gethex () {
+ return (gethexnib() << 4) + gethexnib();
+}
+
+
+void puthex (char ch) {
+ char ah;
+
+ ah = ch >> 4;
+ if(ah >= 0x0a) {
+ ah = ah - 0x0a + 'a';
+ } else {
+ ah += '0';
+ }
+
+ ch &= 0x0f;
+ if(ch >= 0x0a) {
+ ch = ch - 0x0a + 'a';
+ } else {
+ ch += '0';
+ }
+
+ putch(ah);
+ putch(ch);
+}
+
+
+void putch (char ch) {
+ while (!(UCSR0A & _BV(UDRE0)));
+ UDR0 = ch;
+}
+
+
+char getch () {
+ uint32_t count = 0;
+ while( !(UCSR0A & _BV(RXC0)) ) {
+ count++;
+ if (count > MAX_TIME_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+ }
+ return UDR0;
+}
+
+
+void getNch (uint8_t count) {
+ while(count--) {
+ getch();
+ }
+}
+
+
+void byte_response (uint8_t val) {
+ if (getch() == ' ') {
+ putch(0x14);
+ putch(val);
+ putch(0x10);
+ } else if (++error_count == MAX_ERROR_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+}
+
+void nothing_response () {
+ if (getch() == ' ') {
+ putch(0x14);
+ putch(0x10);
+ } else if (++error_count == MAX_ERROR_COUNT) {
+ DDRC = 0; PORTC = 0;
+ app_start();
+ }
+}
+
+void delay () {
+ // app. 200ms
+ for (volatile uint32_t timer = 0; timer < 0x12000; timer++) {
+ if (UCSR0A & _BV(RXC0)) {
+ return;
+ }
+ }
+}
+
+void flash_led (uint8_t count) {
+ SET_LED_RED;
+ delay();
+ SET_LED_ORANGE;
+ delay();
+ PORTC = 0;
+
+ while (count--) {
+ SET_LED_GREEN;
+ delay();
+ CLR_LED_GREEN;
+ delay();
+ }
+}
--- /dev/null
+target remote :1234
+layout split
+stepi
+quit
+target remote :1234
+layout split
+stepi
+b *main+9
+quit
--- /dev/null
+set history save on
+set history size 1000
+set history remove-duplicates 2
+set history filename .gdb_history
+
--- /dev/null
+.depend
+**/build
+**/dist
+**/sim
--- /dev/null
+{
+ "configurations": [
+ {
+ "name": "Linux AVR",
+ "includePath": [
+ "/usr/lib/avr/include/**",
+ "/usr/lib/gcc/avr/**"
+ ],
+ "defines": [],
+ "compilerPath": "/usr/bin/avr-gcc",
+ "compilerArgs": [ "-mmcu=atmega644p", "-DF_CPU=12000000", "-Os" ],
+ "cStandard": "gnu11",
+ "cppStandard": "gnu++11",
+ "intelliSenseMode": "linux-gcc-x64"
+ }
+ ],
+ "version": 4
+}
--- /dev/null
+{
+ // Use IntelliSense to learn about possible attributes.
+ // Hover to view descriptions of existing attributes.
+ // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+ "version": "0.2.0",
+ "configurations": [
+ {
+ "name": "Build",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "build"
+ },{
+ "name": "Flash",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "flash"
+ },{
+ "name": "Clean",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "clean"
+ },{
+ // es muss mit simuc --board arduino dist/programm.elf der Simulator
+ // gestartet werden. Dessen gdb-stub öffnet auf localhost:1234 einen Port
+ "name": "Debug (simuc)",
+ "type": "cppdbg",
+ "request": "launch",
+ "program": "${workspaceFolder}/sim/atmega328p.elf",
+ "cwd": "${workspaceFolder}",
+ "externalConsole": false,
+ "MIMode": "gdb",
+ "miDebuggerPath": "/usr/bin/avr-gdb",
+ "miDebuggerServerAddress": ":1234",
+ "preLaunchTask": "build"
+ }
+ ]
+}
--- /dev/null
+{
+ "[c]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "[h]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "cSpell.words": [],
+ "cSpell.ignorePaths": [
+ "**/*.json", "**/*.c", "**/*.h", "**/Makefile"
+ ],
+ "files.associations": {
+ "delay.h": "c"
+ }
+}
--- /dev/null
+{
+ // See https://go.microsoft.com/fwlink/?LinkId=733558
+ // for the documentation about the tasks.json format
+ "version": "2.0.0",
+ "tasks": [{
+ "label": "build",
+ "type": "shell",
+ "command": "make",
+ "problemMatcher":[
+ "$gcc"
+ ]
+ },{
+ "label": "clean",
+ "type": "shell",
+ "command": "make",
+ "args": [ "clean" ],
+ },{
+ "label": "flash",
+ "type": "shell",
+ "command": "make",
+ "args": [ "flash" ],
+ }]
+}
\ No newline at end of file
--- /dev/null
+.PHONY: all info flash picocom clean
+$(shell mkdir -p dist >/dev/null)
+$(shell mkdir -p build >/dev/null)
+$(shell mkdir -p sim >/dev/null)
+
+NAME="test-nano-644"
+SRC= $(wildcard src/*.c)
+OBJ = $(SRC:src/%.c=build/%.o)
+OBJ_SIM = $(SRC:src/%.c=sim/%.o)
+
+CC= avr-gcc
+CFLAGS= -Wall -mmcu=atmega644p -Os -DF_CPU=12000000 -c
+LFLAGS= -Wall -mmcu=atmega644p -Os -DF_CPU=12000000
+
+CFLAGS_SIM= -Wall -mmcu=atmega644p -O0 -DF_CPU=12000000 -g -c
+LFLAGS_SIM= -Wall -mmcu=atmega644p -O0 -DF_CPU=12000000 -g
+
+
+all: dist/$(NAME).elf dist/$(NAME).s dist/$(NAME).hex sim/$(NAME).elf sim/$(NAME).s info
+
+info:
+ @echo
+ @avr-size --mcu=atmega644p --format=avr dist/$(NAME).elf
+
+.depend: $(SRC)
+ $(CC) -MM $(SRC) > .depend
+
+-include $(DEPENDFILE)
+
+dist/$(NAME).elf: .depend $(OBJ)
+ $(CC) $(LFLAGS) -o $@ $(OBJ)
+
+dist/%.s: dist/%.elf
+ avr-objdump -d $< > $@
+
+dist/%.hex: dist/%.elf
+ avr-objcopy -O ihex $(HEX_FLASH_FLAGS) $< $@
+
+sim/$(NAME).elf: .depend $(OBJ_SIM)
+ $(CC) $(LFLAGS_SIM) -o $@ $(OBJ_SIM)
+
+
+build/%.o: src/%.c
+ $(CC) $(CFLAGS) -o $@ $<
+
+sim/%.o: src/%.c
+ $(CC) $(CFLAGS_SIM) -o $@ $<
+
+sim/%.s: sim/%.elf
+ avr-objdump -d $< > $@
+
+simuc: sim/$(NAME).elf
+ simuc --board arduino $<
+
+gdb: sim/$(NAME).elf
+ avr-gdb $<
+
+isp-flash: dist/$(NAME).elf all
+ avrdude -c usbasp -p m644p -e -U flash:w:$<
+
+flash: dist/$(NAME).elf all
+ avrdude -c arduino -p m644p -P /dev/ttyUSB0 -b 115200 -e -U flash:w:$<
+
+
+picocom:
+ # picocom sends CR for ENTER -> convert cr (\r) to lf (\n)
+ picocom -b 115200 --omap crlf /dev/ttyUSB0
+
+fuse:
+ avrdude -c usbasp -p m644p -U lfuse:w:0xEE:m -U hfuse:w:0xD9:m -U efuse:w:0xFF:m
+
+clean:
+ @rm -r dist
+ @rm -r build
+ @rm -r sim
+ @find . -type f -name ".depend" -exec rm {} \;
+ @echo "clean done"
--- /dev/null
+# Testprogramm Erstinbetriebnahme
--- /dev/null
+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdio.h>
+#include <avr/interrupt.h>
+
+int uart_putchar(char c, FILE *stream) {
+ if (c == '\n') {
+ uart_putchar('\r', stream);
+ }
+ loop_until_bit_is_set(UCSR0A, UDRE0);
+ if (stream == stdout) {
+ UDR0 = c;
+ } else {
+ UDR1 = c;
+ }
+ return 0;
+}
+
+static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+static FILE mystderr = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+
+volatile char fromUart0 [] = " -> X";
+
+int main () {
+
+ DDRC = 0x1C;
+ PORTC = 0x3C;
+
+ TCCR1B = (1 << WGM12) | (1 << CS11);
+ OCR1A = 1500;
+ TIMSK1 = (1 << OCIE1A);
+
+ UCSR0A = (1 << U2X0);
+ UCSR0B = (1 << RXCIE0) | (1 << RXEN0) | (1 <<TXEN0);
+ UCSR0C = (1 << UCSZ01) | ( 1<< UCSZ00);
+ UBRR0H = 0;
+ UBRR0L = F_CPU / 8 / 115200 - 1;
+
+ UCSR1A = (1 << U2X1);
+ UCSR1B = (1 << RXCIE1) | (1 << RXEN1) | (1 <<TXEN1);
+ UCSR1C = (1 << UCSZ11) | ( 1<< UCSZ10);
+ UBRR1H = 0;
+ UBRR1L = F_CPU / 8 / 115200 - 1;
+
+ stdout = &mystdout;
+ stderr = &mystderr;
+ fromUart0[0] = 0;
+ sei();
+
+ uint16_t cnt = 0;
+ while (1) {
+ printf("%04x: Hello world%s %12s\r",
+ cnt++,
+ fromUart0,
+ (PINC & (1 << PC5)) == 0 ? "SW2 pressed" : ""
+ );
+ if ((PINC & (1 << PC5)) == 0) {
+ PORTC &= ~(1 << PC2);
+ }
+ _delay_ms(10);
+ }
+}
+
+ISR (USART0_RX_vect) {
+ PORTC ^= (1 << PC3);
+ uint8_t b = UDR0;
+ UDR1 = b;
+ fromUart0[0] = ' ';
+ fromUart0[4] = b;
+}
+
+ISR (USART1_RX_vect) {
+ uint8_t b = UDR1;
+ if (b == ' ') {
+ PORTC |= (1 << PC2);
+ }
+}
+
+
+ISR (TIMER1_COMPA_vect) {
+ static uint16_t timer = 0;
+ timer++;
+ if (timer >= 1000) {
+ PORTC ^= (1 << PC4);
+ timer = 0;
+ }
+}
+
--- /dev/null
+target remote :1234
+layout split
+stepi
+quit
+target remote :1234
+layout split
+stepi
+b *main+9
+quit
--- /dev/null
+set history save on
+set history size 1000
+set history remove-duplicates 2
+set history filename .gdb_history
+
--- /dev/null
+.depend
+**/build
+**/dist
+**/sim
--- /dev/null
+{
+ "configurations": [
+ {
+ "name": "Linux AVR",
+ "includePath": [
+ "/usr/lib/avr/include/**",
+ "/usr/lib/gcc/avr/**"
+ ],
+ "defines": [],
+ "compilerPath": "/usr/bin/avr-gcc",
+ "compilerArgs": [ "-mmcu=atmega644p", "-DF_CPU=12000000", "-Os" ],
+ "cStandard": "gnu11",
+ "cppStandard": "gnu++11",
+ "intelliSenseMode": "linux-gcc-x64"
+ }
+ ],
+ "version": 4
+}
--- /dev/null
+{
+ // Use IntelliSense to learn about possible attributes.
+ // Hover to view descriptions of existing attributes.
+ // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+ "version": "0.2.0",
+ "configurations": [
+ {
+ "name": "Build",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "build"
+ },{
+ "name": "Flash",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "flash"
+ },{
+ "name": "Clean",
+ // "request": "launch",
+ "type": "node-terminal",
+ "preLaunchTask": "clean"
+ },{
+ // es muss mit simuc --board arduino dist/programm.elf der Simulator
+ // gestartet werden. Dessen gdb-stub öffnet auf localhost:1234 einen Port
+ "name": "Debug (simuc)",
+ "type": "cppdbg",
+ "request": "launch",
+ "program": "${workspaceFolder}/sim/atmega328p.elf",
+ "cwd": "${workspaceFolder}",
+ "externalConsole": false,
+ "MIMode": "gdb",
+ "miDebuggerPath": "/usr/bin/avr-gdb",
+ "miDebuggerServerAddress": ":1234",
+ "preLaunchTask": "build"
+ }
+ ]
+}
--- /dev/null
+{
+ "[c]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "[h]": {
+ "editor.insertSpaces": true,
+ "editor.tabSize": 3,
+ "editor.detectIndentation": false
+ },
+ "cSpell.words": [],
+ "cSpell.ignorePaths": [
+ "**/*.json", "**/*.c", "**/*.h", "**/Makefile"
+ ],
+ "files.associations": {
+ "delay.h": "c"
+ }
+}
--- /dev/null
+{
+ // See https://go.microsoft.com/fwlink/?LinkId=733558
+ // for the documentation about the tasks.json format
+ "version": "2.0.0",
+ "tasks": [{
+ "label": "build",
+ "type": "shell",
+ "command": "make",
+ "problemMatcher":[
+ "$gcc"
+ ]
+ },{
+ "label": "clean",
+ "type": "shell",
+ "command": "make",
+ "args": [ "clean" ],
+ },{
+ "label": "flash",
+ "type": "shell",
+ "command": "make",
+ "args": [ "flash" ],
+ }]
+}
\ No newline at end of file
--- /dev/null
+.PHONY: all info flash picocom clean
+$(shell mkdir -p dist >/dev/null)
+$(shell mkdir -p build >/dev/null)
+$(shell mkdir -p sim >/dev/null)
+
+NAME="uart1-to-uart0"
+SRC= $(wildcard src/*.c)
+OBJ = $(SRC:src/%.c=build/%.o)
+OBJ_SIM = $(SRC:src/%.c=sim/%.o)
+
+DEVICE=atmega644p
+CC= avr-gcc
+CFLAGS= -Wall -mmcu=$(DEVICE) -Os -DF_CPU=12000000 -c
+LFLAGS= -Wall -mmcu=$(DEVICE) -Os -DF_CPU=12000000
+
+CFLAGS_SIM= -Wall -mmcu=atmega644p -Og -DF_CPU=12000000 -g -c
+LFLAGS_SIM= -Wall -mmcu=atmega644p -Og -DF_CPU=12000000 -g
+
+
+all: dist/$(NAME).elf dist/$(NAME).s sim/$(NAME).elf sim/$(NAME).s info
+
+info:
+ @echo
+ @avr-size --mcu=atmega644p --format=avr dist/$(NAME).elf
+
+.depend: $(SRC)
+ $(CC) -mmcu=$(DEVICE) -MM $(SRC) > .depend
+
+-include $(DEPENDFILE)
+
+dist/$(NAME).elf: .depend $(OBJ)
+ $(CC) $(LFLAGS) -o $@ $(OBJ)
+
+dist/%.s: dist/%.elf
+ avr-objdump -d $< > $@
+
+sim/$(NAME).elf: .depend $(OBJ_SIM)
+ $(CC) $(LFLAGS_SIM) -o $@ $(OBJ_SIM)
+
+
+build/%.o: src/%.c
+ $(CC) $(CFLAGS) -o $@ $<
+
+sim/%.o: src/%.c
+ $(CC) $(CFLAGS_SIM) -o $@ $<
+
+sim/%.s: sim/%.elf
+ avr-objdump -d $< > $@
+
+simuc: sim/$(NAME).elf
+ simuc --board arduino $<
+
+gdb: sim/$(NAME).elf
+ avr-gdb $<
+
+isp-flash: dist/$(NAME).elf all
+ avrdude -c usbasp -p m644p -e -U flash:w:$<
+
+flash: dist/$(NAME).elf all
+ avrdude -c arduino -p m644p -P /dev/ttyUSB0 -b 115200 -e -U flash:w:$<
+
+
+picocom:
+ # picocom sends CR for ENTER -> convert cr (\r) to lf (\n)
+ picocom -b 115200 --omap crlf /dev/ttyUSB0
+
+fuse:
+ avrdude -c usbasp -p m644p -U lfuse:w:0xEE:m -U hfuse:w:0xD9:m -U efuse:w:0xFF:m
+
+clean:
+ @rm -r dist
+ @rm -r build
+ @rm -r sim
+ @find . -type f -name ".depend" -exec rm {} \;
+ @echo "clean done"
--- /dev/null
+# uart1-to-uart0
+
+Dieses Programm leitet die über die UART1 Schnittstelle eintreffenden Bytes auf die UART0 Schnittstelle um.
+
+UART Modus: 115200/8N1
+
+
--- /dev/null
+#include <avr/io.h>
+#include <util/delay.h>
+#include <stdio.h>
+#include <avr/interrupt.h>
+
+int uart_putchar(char c, FILE *stream) {
+ if (c == '\n') {
+ uart_putchar('\r', stream);
+ }
+ loop_until_bit_is_set(UCSR0A, UDRE0);
+ if (stream == stdout) {
+ UDR0 = c;
+ } else {
+ UDR1 = c;
+ }
+ return 0;
+}
+
+static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+static FILE mystderr = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+
+int main () {
+
+ DDRC = 0x1C;
+ PORTC = 0;
+
+ TCCR1B = (1 << WGM12) | (1 << CS11);
+ OCR1A = 1500;
+ TIMSK1 = (1 << OCIE1A);
+
+ UCSR0A = (1 << U2X0);
+ UCSR0B = (1 << RXCIE0) | (1 << RXEN0) | (1 <<TXEN0);
+ UCSR0C = (1 << UCSZ01) | ( 1<< UCSZ00);
+ UBRR0H = 0;
+ UBRR0L = F_CPU / 8 / 115200 - 1;
+
+ UCSR1A = (1 << U2X1);
+ UCSR1B = (1 << RXCIE1) | (1 << RXEN1) | (1 <<TXEN1);
+ UCSR1C = (1 << UCSZ11) | ( 1<< UCSZ10);
+ UBRR1H = 0;
+ UBRR1L = F_CPU / 8 / 115200 - 1;
+
+ stdout = &mystdout;
+ stderr = &mystderr;
+ sei();
+ printf("UART1 -> UART0 ready\n");
+
+ while (1) {
+ }
+}
+
+ISR (USART0_RX_vect) {
+ PORTC ^= (1 << PC3);
+ uint8_t b = UDR0;
+}
+
+ISR (USART1_RX_vect) {
+ PORTC ^= (1 << PC2);
+ uint8_t b = UDR1;
+ UDR0 = b;
+}
+
+
+ISR (TIMER1_COMPA_vect) {
+ static uint16_t timer = 0;
+ timer++;
+ if (timer >= 1000) {
+ PORTC ^= (1 << PC4);
+ timer = 0;
+ }
+}
+