razzor
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uartboot
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initial version

master
Olaf Rempel 6 years ago
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e7b67a0aa7
3 changed files with 656 additions and 0 deletions
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  1. +8
    -0
      .gitignore
  2. +104
    -0
      Makefile
  3. +544
    -0
      main.c

+ 8
- 0
.gitignore View File

@@ -0,0 +1,8 @@
*.o
*.elf
*.bin
*.hex
*.lst
*.lss
*.map
ldscript-no-vectors-*.x

+ 104
- 0
Makefile View File

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CC := avr-gcc
LD := avr-ld
OBJCOPY := avr-objcopy
OBJDUMP := avr-objdump
SIZE := avr-size

TARGET = uartboot
SOURCE = $(wildcard *.c)

#CONFIG = ispprog
#CONFIG = flightctrl
#CONFIG = funkstuff
CONFIG = ispprog2

AVRDUDE_PROG := -c avr910 -b 115200 -P /dev/ttyUSB0
#AVRDUDE_PROG := -c dragon_isp -P usb

# ---------------------------------------------------------------------------

ifeq ($(CONFIG), ispprog)
MCU=atmega16
AVRDUDE_MCU=m16

# (7.3728MHz ext. crystal)
AVRDUDE_FUSES=lfuse:w:0xff:m hfuse:w:0xda:m
BOOTLOADER_START=0x3C00
endif

# -------------------------

ifeq ($(CONFIG), flightctrl)
MCU=atmega644p
AVRDUDE_MCU=m644p

# (20MHz ext. Crystal, 2.7V BOD)
AVRDUDE_FUSES=lfuse:w:0xff:m hfuse:w:0xdc:m efuse:w:0xfd:m
BOOTLOADER_START=0xF800
endif

# -------------------------

ifeq ($(CONFIG), funkstuff)
MCU=atmega88
AVRDUDE_MCU=m88 -F

# (ext. crystal)
#AVRDUDE_FUSES=lfuse:w:0x84:m hfuse:w:0xda:m
BOOTLOADER_START=0x1C00
endif

# -------------------------

ifeq ($(CONFIG), ispprog2)
MCU=atmega328p
AVRDUDE_MCU=m328p -F

# (8MHz internal osc., 2.7V BOD)
AVRDUDE_FUSES=lfuse:w:0xe2:m hfuse:w:0xdc:m efuse:w:0x02:m
BOOTLOADER_START=0x7C00
endif

# ---------------------------------------------------------------------------

CFLAGS = -pipe -g -Os -mmcu=$(MCU) -Wall
CFLAGS += -fdata-sections -ffunction-sections
CFLAGS += -Wa,-adhlns=$(*F).lst
CFLAGS += -DBOOTLOADER_START=$(BOOTLOADER_START) -DCONFIG_$(CONFIG)=1
LDFLAGS = -Wl,-Map,$(@:.elf=.map),--cref,--section-start=.text=$(BOOTLOADER_START)
LDFLAGS += -Wl,--relax,--gc-sections

LDSCRIPT := $(shell LANG=C $(CC) $(CFLAGS) -Wl,--verbose 2> /dev/null | awk '/^opened script file (.*)$$/{ print $$4 }')
LDSCRIPT_NOVECT := ldscript-no-vectors-$(notdir $(LDSCRIPT))

# ---------------------------------------------------------------------------

$(TARGET): $(TARGET).elf
@$(SIZE) -B -x --mcu=$(MCU) $<

$(TARGET).elf: $(SOURCE:.c=.o) | $(LDSCRIPT_NOVECT)
@echo " Linking file: $@"
@$(CC) $(CFLAGS) $(LDFLAGS) -Wl,-T$(LDSCRIPT_NOVECT) -o $@ $^ #2> /dev/null
@$(OBJDUMP) -h -S $@ > $(@:.elf=.lss)
@$(OBJCOPY) -j .text -j .data -O ihex $@ $(@:.elf=.hex)
@$(OBJCOPY) -j .text -j .data -O binary $@ $(@:.elf=.bin)

%.o: %.c $(MAKEFILE_LIST)
@echo " Building file: $<"
@$(CC) $(CFLAGS) -o $@ -c $<

# remove interrupt vector section from avr-libc linker script
# (remove all lines with *vectors* and insert DISCARD line above .text declaration)
$(LDSCRIPT_NOVECT): $(LDSCRIPT) $(MAKEFILE_LIST)
@echo " Creating: $@"
@sed -e '/.*vectors.*/d' -e 's/\(^[ \t]*\)\(.text[ \t]*\:\)$$/\1\/DISCARD\/ : { *(.vectors) }\n\1\2/g' $< > $@
# -@diff -uNr $< $@ > $@.diff

clean:
rm -rf $(SOURCE:.c=.o) $(SOURCE:.c=.lst) $(addprefix $(TARGET), .elf .map .lss .hex .bin) ldscript-no-vectors-*

install: $(TARGET).elf
avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) -U flash:w:$(<:.elf=.hex)

fuses:
avrdude $(AVRDUDE_PROG) -p $(AVRDUDE_MCU) $(patsubst %,-U %, $(AVRDUDE_FUSES))

+ 544
- 0
main.c View File

@@ -0,0 +1,544 @@
/***************************************************************************
* Copyright (C) 10/2014 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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; version 2 of the License, *
* *
* 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, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/boot.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>

/* *********************************************************************** */
#if defined(CONFIG_ispprog)
/*
* using ATmega16 @7.3728MHz:
* Fuse H: 0xDA (512 words bootloader, jtag disabled)
* Fuse L: 0xFF (ext. Crystal)
*/
#define F_CPU 7372800
#define BAUDRATE 19200
#define DEVCODE 0x74

/* 100 * 10ms => 1000ms */
//#define TIMEOUT 100

/* enter bootloader if PIND3 is high */
#define ISP_DDR DDRD
#define ISP_PIN PIND
#define ISP_PORT PORTD
#define ISP_NUM PIND3
#define ISP_POL 1

/* low active led on PORTB3 */
#define LED_DDR DDRB
#define LED_PORT PORTB
#define LED_NUM PORTB3
#define LED_POL 0

/* *********************************************************************** */
#elif defined(CONFIG_flightctrl)
/*
* using ATmega644 @20MHz:
* Fuse E: 0xFD (2.7V BOD)
* Fuse H: 0xDC (1024 words bootloader)
* Fuse L: 0xFF (ext. Crystal)
*/
#define F_CPU 20000000
#define BAUDRATE 57600
#define DEVCODE 0x74 /* mega16 devcode */

/* 100 * 10ms => 1000ms */
#define TIMEOUT 100

/* enter bootloader if PIND3 is high */
//#define ISP_DDR DDRD
//#define ISP_PIN PIND
//#define ISP_PORT PORTD
//#define ISP_NUM PIND3
//#define ISP_POL 1

/* high active led on PORTB1 */
#define LED_DDR DDRB
#define LED_PORT PORTB
#define LED_NUM PORTB1
#define LED_POL 1

/* support special MKBL commands */
#define SUPPORT_MKBL 1

/* *********************************************************************** */
#elif defined(CONFIG_funkstuff)
/*
* using ATmega88 @8MHz:
* Fuse E: 0xFA (2.7V BOD)
* Fuse H: 0xDD (512 words bootloader)
* Fuse L: 0xE2 (internal osc)
*/
#define F_CPU 8000000
#define BAUDRATE 19200
#define DEVCODE 0x76 /* mega8 devcode */

/* 100 * 10ms => 1000ms */
#define TIMEOUT 100

/* enter bootloader if PIND3 is high */
//#define ISP_DDR DDRD
//#define ISP_PIN PIND
//#define ISP_PORT PORTD
//#define ISP_NUM PIND3
//#define ISP_POL 1

/* low active led on PORTB3 */
//#define LED_DDR DDRB
//#define LED_PORT PORTB
//#define LED_NUM PORTB3
//#define LED_POL 0

/* *********************************************************************** */
#elif defined(CONFIG_ispprog2)
/*
* using ATmega328P @8MHz:
* Fuse E: 0xFA (2.7V BOD)
* Fuse H: 0xDC (512 words bootloader)
* Fuse L: 0xE2 (internal osc)
*/
#define F_CPU 8000000
#define BAUDRATE 115200
#define DEVCODE 0x72 /* mega32 devcode */

/* 100 * 10ms => 1000ms */
#define TIMEOUT 100

/* enter bootloader if PINB1 is low */
#define ISP_DDR DDRB
#define ISP_PIN PINB
#define ISP_PORT PORTB
#define ISP_NUM PINB1
#define ISP_POL 0

/* high active led on PORTB0 */
#define LED_DDR DDRB
#define LED_PORT PORTB
#define LED_NUM PORTB0
#define LED_POL 1

/* trim internal oscillator to get "good" baudrate */
#define OSCCAL_VALUE 0x80

/* *********************************************************************** */
#else
#error "unknown CONFIG"
#endif
/* *********************************************************************** */

/* needs F_CPU */
#include <util/delay.h>

#define UART_CALC_BAUDRATE(baudRate) ((uint32_t)(F_CPU) / ((uint32_t)(baudRate)*16) -1)

#if defined(ISP_NUM)
#if (ISP_POL == 0)
#define ISP_INIT() { ISP_DDR &= ~(1<<ISP_NUM); ISP_PORT |= (1<<ISP_NUM); }
#define ISP_CHECK() (ISP_PIN & (1<<ISP_NUM))
#else
#define ISP_INIT() { ISP_DDR &= ~(1<<ISP_NUM); ISP_PORT &= ~(1<<ISP_NUM); }
#define ISP_CHECK() !(ISP_PIN & (1<<ISP_NUM))
#endif
#endif /* defined(ISP_NUM) */

#if defined(LED_NUM)
#define LED_INIT() LED_DDR |= (1<<LED_NUM);
#if (LED_POL == 0)
#define LED_ON() LED_PORT &= ~(1<<LED_NUM)
#define LED_OFF() LED_PORT |= (1<<LED_NUM)
#else
#define LED_ON() LED_PORT |= (1<<LED_NUM)
#define LED_OFF() LED_PORT &= ~(1<<LED_NUM)
#endif
#else
#define LED_INIT()
#define LED_ON()
#define LED_OFF()
#endif /* defined(LED_NUM) */


static uint8_t page_buf[SPM_PAGESIZE];
register uint16_t address asm("r2");


#if defined(__AVR_ATmega16__)
static void uartinit(void)
{
/* Set baud rate */
UBRRH = (UART_CALC_BAUDRATE(BAUDRATE)>>8) & 0xFF;
UBRRL = (UART_CALC_BAUDRATE(BAUDRATE) & 0xFF);

/* enable usart with 8n1 */
UCSRB = (1<<TXEN) | (1<<RXEN);
UCSRC = (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0);
} /* uartinit */

static void sendchar(uint8_t data)
{
loop_until_bit_is_set(UCSRA, UDRE);
UDR = data;
} /* sendchar */

static uint8_t recvchar(void)
{
loop_until_bit_is_set(UCSRA, RXC);
return UDR;
} /* recvchar */

#if defined(TIMEOUT)
static uint8_t recvcheck(void)
{
return (UCSRA & (1<<RXC));
} /* recvcheck */
#endif /* defined(TIMEOUT) */

#elif defined(__AVR_ATmega88__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega644P__)
static void uartinit(void)
{
/* set baudrate */
UBRR0H = (UART_CALC_BAUDRATE(BAUDRATE)>>8) & 0xFF;
UBRR0L = (UART_CALC_BAUDRATE(BAUDRATE) & 0xFF);

/* USART: rx/tx enable, 8n1 */
UCSR0B = (1<<TXEN0) | (1<<RXEN0);
UCSR0C = (1<<UCSZ01) | (1<<UCSZ00);
} /* uartinit */

static void sendchar(uint8_t data)
{
loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = data;
} /* sendchar */

static uint8_t recvchar(void)
{
loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0;
} /* recvchar */

#if defined(TIMEOUT)
static uint8_t recvcheck(void)
{
return (UCSR0A & (1<<RXC0));
} /* recvcheck */
#endif /* defined(TIMEOUT) */
#endif


static void eraseFlash(void)
{
address = 0;
while (address < BOOTLOADER_START) {
boot_page_erase(address);
boot_spm_busy_wait();
address += SPM_PAGESIZE;
}
boot_rww_enable();
} /* eraseFlash */


static void writeFlashPage(uint16_t size)
{
uint16_t pagestart = address;
uint8_t *tmp = page_buf;

do {
uint16_t data;
data = *tmp++;
data |= (*tmp++ << 8);
boot_page_fill(address, data);

address += 2;
size -= 2;
} while (size);

boot_page_write(pagestart);
boot_spm_busy_wait();
boot_rww_enable();
} /* writeFlashPage */


static void writeEEpromPage(uint16_t size)
{
uint8_t *tmp = page_buf;

do {
EEARL = address;
EEARH = (address >> 8);
EEDR = *tmp++;
address++;

#if defined(__AVR_ATmega16__)
EECR |= (1<<EEMWE);
EECR |= (1<<EEWE);
#elif defined(__AVR_ATmega88__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega644P__)
EECR |= (1<<EEMPE);
EECR |= (1<<EEPE);
#else
#error writeEEpromPage() not implemented
#endif
eeprom_busy_wait();

size--;
} while (size);
} /* writeEEpromPage */


static void readSendFlashPage(uint16_t size)
{
do {
sendchar(pgm_read_byte_near(address++));
size--;
} while (size);
} /* readSendFlashPage */


static void readSendEEpromPage(uint16_t size)
{
do {
EEARL = address;
EEARH = (address >> 8);
EECR |= (1<<EERE);
address++;

sendchar(EEDR);

size--;
} while (size);
} /* readSendEEpromPage */


#if defined(__AVR_ATmega88__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega644P__)
/*
* For newer devices the watchdog timer remains active even after a
* system reset. So disable it as soon as possible.
* automagically called on startup
*/
void disable_wdt_timer(void) __attribute__((naked, section(".init3")));
void disable_wdt_timer(void)
{
MCUSR = 0;
WDTCSR = (1<<WDCE) | (1<<WDE);
WDTCSR = (0<<WDE);
}
#endif

static void (*jump_to_app)(void) __attribute__ ((noreturn)) = 0x0000;

int main(void) __attribute__ ((noreturn));
int main(void)
{
#if defined(ISP_NUM)
/* set as input, enable pullup/pulldown */
ISP_INIT();

/* check if bootloader is not selected */
if (ISP_CHECK()) {
jump_to_app();
}
#endif /* defined(ISP_NUM) */

#if defined(LED_NUM)
LED_DDR |= (1<<LED_NUM);
#endif /* defined(LED_NUM) */

#if defined(OSCCAL_VALUE)
OSCCAL = OSCCAL_VALUE;
#endif /* defined(OSCCAL_VALUE) */

/* initalize UART */
uartinit();

uint8_t val = 'S';

#if defined(TIMEOUT)
uint8_t prev = 0x00;
uint8_t boot_timeout = TIMEOUT;

while (1) {
if (recvcheck()) {
val = recvchar();

#if defined(SUPPORT_MKBL)
if ((prev == 0x1B) && (val == 0xAA || val == 'S')) {
break;
}
#else
if ((prev == 0x1B) && (val == 'S')) {
break;
}
#endif /* defined(SUPPORT_MKBL) */

prev = val;
}

_delay_ms(10);

boot_timeout--;
if (boot_timeout == 0x00) {
LED_OFF();
jump_to_app();
}

#if defined(LED_NUM)
if (!(boot_timeout & 0x03)) {
LED_PORT ^= (1<<LED_NUM);
}
#endif /* defined(LED_NUM) */
}
#endif /* defined(TIMEOUT) */

/* turn on LED */
LED_ON();

while (1) {
uint8_t response = 0xFF;

/* Autoincrement? */
if (val == 'a') {
response = 'Y';

/* write address */
} else if (val == 'A') {
address = (recvchar() << 8);
address |= recvchar();
response = '\r';

/* Buffer load support */
} else if (val == 'b') {
sendchar('Y');
sendchar((SPM_PAGESIZE >> 8) & 0xFF);
response = SPM_PAGESIZE & 0xFF;

/* Start buffer load */
} else if (val == 'B') {
uint16_t size;
uint16_t count;
uint8_t *data = page_buf;

size = (recvchar() << 8);
size |= recvchar();
val = recvchar();

for (count = 0; count < SPM_PAGESIZE; count++) {
*data++ = (count < size) ? recvchar() : 0xFF;
}

if ((val == 'F') && (address < BOOTLOADER_START)) {
writeFlashPage(size);
response = '\r';

} else if ((val == 'E') && (address < E2END)) {
writeEEpromPage(size);
response = '\r';

} else {
response = 0x00;
}

/* Block read */
} else if (val == 'g') {
uint16_t size;

size = (recvchar() << 8);
size |= recvchar();
val = recvchar();

if (val == 'F') {
readSendFlashPage(size);

} else if (val == 'E') {
readSendEEpromPage(size);
}

/* Chip erase */
} else if (val == 'e') {
eraseFlash();
response = '\r';

/* Exit upgrade */
} else if (val == 'E') {
wdt_enable(WDTO_250MS);
response = '\r';

/* Enter/Leave programming mode */
} else if ((val == 'P') || (val == 'L')) {
response = '\r';

/* return programmer type: serial */
} else if (val == 'p') {
response = 'S';

/* Return device type */
} else if (val == 't') {
sendchar(DEVCODE);
response = 0x00;

/* Clear and set LED ignored */
} else if ((val == 'x') || (val == 'y')) {
recvchar();
response = '\r';

/* Set device */
} else if (val == 'T') {
response = (recvchar() == DEVCODE) ? '\r' : 0x00;

/* Return software identifier */
} else if (val == 'S') {
sendchar('A');
sendchar('V');
sendchar('R');
sendchar('B');
sendchar('O');
sendchar('O');
response = 'T';

#if defined(SUPPORT_MKBL)
} else if (val == 0xAA) {
sendchar('M');
sendchar('K');
sendchar('B');
response = 'L';
#endif /* defined(SUPPORT_MKBL) */

/* Return Software/Hardware Version */
} else if ((val == 'V') || (val == 'v')) {
sendchar('0');
response = '8';

/* Return Signature Bytes */
} else if (val == 's') {
sendchar(SIGNATURE_2);
sendchar(SIGNATURE_1);
response = SIGNATURE_0;

} else if (val != 0x1B) {
response = '?';
}

if (response != 0xFF) {
sendchar(response);
}

val = recvchar();
}
}

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