initial version
This commit is contained in:
commit
3f5a773ac7
6
.gitignore
vendored
Normal file
6
.gitignore
vendored
Normal file
@ -0,0 +1,6 @@
|
||||
*.o
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||||
*.elf
|
||||
*.bin
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||||
*.hex
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*.lst
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||||
*.map
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||||
56
Makefile
Normal file
56
Makefile
Normal file
@ -0,0 +1,56 @@
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||||
PRG = mpmboot
|
||||
OBJ = main.o
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||||
MCU_TARGET = atmega32
|
||||
OPTIMIZE = -Os
|
||||
|
||||
ifeq ($(MCU_TARGET), atmega32)
|
||||
# hfuse = 0x?A (2k bootloader)
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||||
BOOTLOADER_START=0x7800
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||||
AVRDUDE_MCU=m32
|
||||
endif
|
||||
|
||||
DEFS = -DBOOTLOADER_START=$(BOOTLOADER_START)
|
||||
LIBS =
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||||
|
||||
# Override is only needed by avr-lib build system.
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||||
override CFLAGS = -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
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override LDFLAGS = -Wl,-Map,$(PRG).map,--section-start=.text=$(BOOTLOADER_START)
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||||
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||||
CC = avr-gcc
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||||
OBJCOPY = avr-objcopy
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||||
OBJDUMP = avr-objdump
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||||
SIZE = avr-size
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||||
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||||
all: $(PRG).elf lst text
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$(SIZE) -x -A $(PRG).elf
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||||
$(PRG).elf: $(OBJ)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
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||||
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||||
%.o: %.c $(MAKEFILE_LIST)
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||||
$(CC) $(CFLAGS) -c $< -o $@
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clean:
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rm -rf *.o $(PRG).lst $(PRG).map $(PRG).elf $(PRG).hex $(PRG).bin
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||||
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||||
lst: $(PRG).lst
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||||
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||||
%.lst: %.elf
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||||
$(OBJDUMP) -h -S $< > $@
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||||
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||||
text: hex bin
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||||
|
||||
hex: $(PRG).hex
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||||
bin: $(PRG).bin
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||||
|
||||
%.hex: %.elf
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||||
$(OBJCOPY) -j .text -j .data -O ihex $< $@
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||||
|
||||
%.bin: %.elf
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||||
$(OBJCOPY) -j .text -j .data -O binary $< $@
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|
||||
install: text
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||||
avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -V -U flash:w:$(PRG).hex
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|
||||
reset:
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avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU)
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||||
501
main.c
Normal file
501
main.c
Normal file
@ -0,0 +1,501 @@
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/***************************************************************************
|
||||
* Copyright (C) 01/2012 by Olaf Rempel *
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||||
* razzor@kopf-tisch.de *
|
||||
* *
|
||||
* This program is free software; you can redistribute it and/or modify *
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||||
* it under the terms of the GNU General Public License as published by *
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||||
* the Free Software Foundation; version 2 of the License, *
|
||||
* *
|
||||
* This program is distributed in the hope that it will be useful, *
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||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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||||
* 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 *
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||||
* Free Software Foundation, Inc., *
|
||||
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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||||
***************************************************************************/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/boot.h>
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#include <avr/pgmspace.h>
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|
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/*
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* atmega32:
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* Fuse H: 0xda (1024 words bootloader)
|
||||
* Fuse L: 0xd4 (8Mhz internal RC-Osz.)
|
||||
*/
|
||||
|
||||
#if defined (__AVR_ATmega32__)
|
||||
#define F_CPU 8000000
|
||||
#define VERSION_STRING "MPMBOOT m32v1.0"
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||||
#define SIGNATURE_BYTES 0x1E, 0x95, 0x02
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|
||||
#else
|
||||
#error MCU not supported
|
||||
#endif
|
||||
|
||||
/* 25ms @8MHz */
|
||||
#define TIMER_RELOAD (0xFF - 195)
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||||
|
||||
/* 40 * 25ms */
|
||||
#define TIMEOUT 40
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||||
|
||||
#define LED_INIT() DDRD = (1<<PORTD3) | (1<<PORTD2)
|
||||
#define LED_RT_ON() /* not used */
|
||||
#define LED_RT_OFF() /* not used */
|
||||
#define LED_GN_ON() PORTD &= ~(1<<PORTD3)
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||||
#define LED_GN_OFF() PORTD |= (1<<PORTD3)
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||||
#define LED_GN_TOGGLE() PORTD ^= (1<<PORTD3)
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||||
#define LED_OFF() PORTD = (1<<PORTD3)
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||||
|
||||
#define BAUDRATE 115200
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||||
#define MPM_ADDRESS 0x11
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||||
|
||||
#define CMD_WAIT 0x00
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||||
#define CMD_SWITCH_MODE 0x01
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||||
#define CMD_GET_VERSION 0x02
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||||
#define CMD_GET_CHIPINFO 0x03
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||||
#define CMD_READ_MEMORY 0x11
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||||
#define CMD_WRITE_MEMORY 0x12
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||||
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||||
#define CAUSE_SUCCESS 0x00
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||||
#define CAUSE_NOT_SUPPORTED 0xF0
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||||
#define CAUSE_INVALID_PARAMETER 0xF1
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||||
#define CAUSE_UNSPECIFIED_ERROR 0xFF
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||||
|
||||
#define BOOTMODE_BOOTLOADER 0x00
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||||
#define BOOTMODE_APPLICATION 0x80
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||||
|
||||
#define MEMTYPE_FLASH 0x01
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||||
#define MEMTYPE_EEPROM 0x02
|
||||
|
||||
#define BOOTWAIT_EXPIRED 0x00
|
||||
#define BOOTWAIT_RUNNING 0x01
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||||
#define BOOTWAIT_INTERRUPTED 0x02
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||||
|
||||
#define UART_CALC_BAUDRATE(baudRate) (((uint32_t)F_CPU) / (((uint32_t)baudRate)*16) -1)
|
||||
|
||||
/*
|
||||
* LED_GN blinks with 20Hz (while bootloader is running)
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||||
* LED_RT blinks on activity
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||||
*
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* general protocol:
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* =================
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* req: <device> <cmd> <length> <data>*
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||||
* rsp: <cmd> <cause> <length> <data>*
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||||
*
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||||
* device is MPM device address and has 9th bit set, all other
|
||||
* bytes in request & response have 9th bit NOT set
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||||
*
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||||
* length is 16bit, MSB first
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||||
*
|
||||
* rsp-cause codes:
|
||||
* 0x00 - ok
|
||||
* 0xF0 - command not supported (unknown to bootloader)
|
||||
* 0xF1 - parameter error (invalid memtype/address)
|
||||
* 0xFF - unspecified error
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||||
*
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||||
* CMD switch mode:
|
||||
* ================
|
||||
* req: <cmd:0x01>,<length:0x0001>,<mode>
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||||
* rsp: <cmd:0x01>,<cause:0x00>,<length:0x0000>
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||||
*
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||||
* mode codes:
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||||
* 0x00 - bootloader
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||||
* 0x80 - application
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||||
*
|
||||
* CMD get bootloader version:
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||||
* ===========================
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||||
* req: <cmd:0x02>,<length:0x0000>
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||||
* rsp: <cmd:0x02>,<cause:0x00>,<length[2]>,<data[x]>
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||||
*
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* response data is bootloader version string with implementation specific length
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||||
*
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||||
* CMD get chip info:
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||||
* ==================
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||||
* req: <cmd:0x03>,<length:0x0000>
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||||
* rsp: <cmd:0x03>,<cause:0x00>,<length:0x0008>,<signature[3]><pagesize[1]><flashsize[2]><eepromsize[2]>
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||||
*
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||||
* CMD read memory:
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||||
* ================
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||||
* req: <cmd:0x11>,<length:0x0004>,<memtype>,<address[2]>,<size[2]>
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||||
* rsp: <cmd:0x11>,<cause:0x00>,<length[2]>,<data[x]>
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||||
*
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||||
* memtype codes:
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||||
* 0x01 - flash memory
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||||
* 0x02 - eeprom memory
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||||
*
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||||
* CMD write memory:
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||||
* =================
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||||
* req: <cmd:0x12>,<length[2]>,<memtype>,<address[2]>,<size[2]>,<data[x]>
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||||
* rsp: <cmd:0x12>,<cause:0x00>,<length:0x0000>
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||||
*
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||||
* memtype codes:
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||||
* 0x01 - flash memory
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||||
* 0x02 - eeprom memory
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||||
*
|
||||
*/
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||||
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||||
const static uint8_t info[16] = VERSION_STRING;
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||||
const static uint8_t chipinfo[8] = {
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||||
SIGNATURE_BYTES,
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||||
SPM_PAGESIZE,
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||||
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||||
((BOOTLOADER_START) >> 8) & 0xFF,
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||||
(BOOTLOADER_START) & 0xFF,
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||||
((E2END +1) >> 8 & 0xFF),
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||||
(E2END +1) & 0xFF
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||||
};
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||||
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||||
/* wait 40 * 25ms = 1s */
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||||
static uint8_t boot_timeout = TIMEOUT;
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||||
volatile static uint8_t boot_wait = BOOTWAIT_RUNNING;
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||||
static uint8_t rx_addressed;
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||||
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static uint16_t rx_bcnt;
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||||
static uint8_t rx_cmd;
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||||
static uint16_t rx_length;
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||||
|
||||
static uint16_t tx_bcnt;
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||||
static uint8_t tx_cmd;
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||||
static uint8_t tx_cause;
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||||
static uint16_t tx_length;
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||||
|
||||
static uint8_t para_mode;
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||||
static uint8_t para_memtype;
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||||
static uint16_t para_address;
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||||
static uint16_t para_size;
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||||
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||||
/* flash buffer */
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||||
static uint8_t pagebuf[SPM_PAGESIZE];
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||||
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||||
static void write_flash_page(void)
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||||
{
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||||
uint16_t pagestart = para_address;
|
||||
uint8_t size = SPM_PAGESIZE;
|
||||
uint8_t *p = pagebuf;
|
||||
|
||||
if (pagestart >= BOOTLOADER_START)
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||||
return;
|
||||
|
||||
boot_page_erase(pagestart);
|
||||
boot_spm_busy_wait();
|
||||
|
||||
do {
|
||||
uint16_t data = *p++;
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||||
data |= *p++ << 8;
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||||
boot_page_fill(para_address, data);
|
||||
|
||||
para_address += 2;
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||||
size -= 2;
|
||||
} while (size);
|
||||
|
||||
boot_page_write(pagestart);
|
||||
boot_spm_busy_wait();
|
||||
boot_rww_enable();
|
||||
}
|
||||
|
||||
static uint8_t read_eeprom_byte(void)
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||||
{
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||||
EEARL = para_address;
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||||
EEARH = (para_address >> 8);
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||||
EECR |= (1<<EERE);
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||||
return EEDR;
|
||||
}
|
||||
|
||||
static void write_eeprom_page(void)
|
||||
{
|
||||
uint8_t *val = pagebuf;
|
||||
while (para_size) {
|
||||
EEARL = para_address;
|
||||
EEARH = (para_address >> 8);
|
||||
EEDR = *val++;
|
||||
para_address++;
|
||||
para_size--;
|
||||
#if defined (__AVR_ATmega32__)
|
||||
EECR |= (1<<EEMWE);
|
||||
EECR |= (1<<EEWE);
|
||||
#else
|
||||
#error write_eeprom_byte(): access not defined
|
||||
#endif
|
||||
eeprom_busy_wait();
|
||||
}
|
||||
}
|
||||
|
||||
ISR(USART_RXC_vect)
|
||||
{
|
||||
uint8_t data = UDR;
|
||||
|
||||
if (rx_addressed == 0) {
|
||||
/* own address, disable MPM mode and receive following bytes */
|
||||
if (data == MPM_ADDRESS) {
|
||||
boot_wait = BOOTWAIT_INTERRUPTED;
|
||||
LED_GN_ON();
|
||||
|
||||
UCSRA &= ~(1<<MPCM);
|
||||
rx_addressed = 1;
|
||||
rx_bcnt = 0;
|
||||
}
|
||||
|
||||
} else {
|
||||
if (rx_bcnt == 0) {
|
||||
rx_cmd = data;
|
||||
|
||||
} else if (rx_bcnt == 1 || rx_bcnt == 2) {
|
||||
rx_length = (rx_length << 8) | data;
|
||||
|
||||
} else if ((rx_cmd == CMD_SWITCH_MODE) && (rx_bcnt == 3)) {
|
||||
para_mode = data;
|
||||
|
||||
} else if (((rx_cmd == CMD_READ_MEMORY) || (rx_cmd == CMD_WRITE_MEMORY)) &&
|
||||
((rx_bcnt >= 3) && (rx_bcnt <= 7))
|
||||
) {
|
||||
switch (rx_bcnt) {
|
||||
case 3:
|
||||
para_memtype = data;
|
||||
break;
|
||||
|
||||
case 4:
|
||||
case 5:
|
||||
para_address = (para_address << 8) | data;
|
||||
break;
|
||||
|
||||
case 6:
|
||||
case 7:
|
||||
para_size = (para_size << 8) | data;
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
} else if ((rx_cmd == CMD_WRITE_MEMORY) && (rx_bcnt > 7) && (rx_bcnt <= (rx_length +2))) {
|
||||
if ((rx_bcnt -8) < sizeof(pagebuf)) {
|
||||
pagebuf[(rx_bcnt -8)] = data;
|
||||
}
|
||||
}
|
||||
|
||||
if (rx_bcnt == (rx_length +2)) {
|
||||
/* setup response */
|
||||
tx_bcnt = 0;
|
||||
tx_cmd = rx_cmd;
|
||||
tx_cause = CAUSE_SUCCESS;
|
||||
tx_length = 0;
|
||||
|
||||
switch (tx_cmd) {
|
||||
case CMD_SWITCH_MODE:
|
||||
if ((para_mode != BOOTMODE_APPLICATION) && (para_mode != BOOTMODE_BOOTLOADER)) {
|
||||
tx_cause = CAUSE_INVALID_PARAMETER;
|
||||
}
|
||||
break;
|
||||
|
||||
case CMD_GET_VERSION:
|
||||
tx_length = sizeof(info);
|
||||
break;
|
||||
|
||||
case CMD_GET_CHIPINFO:
|
||||
tx_length = sizeof(chipinfo);
|
||||
break;
|
||||
|
||||
case CMD_READ_MEMORY:
|
||||
tx_length = para_size;
|
||||
/* no break */
|
||||
case CMD_WRITE_MEMORY:
|
||||
if (para_memtype == MEMTYPE_FLASH) {
|
||||
/* only access application area */
|
||||
if (para_address > (BOOTLOADER_START - SPM_PAGESIZE)) {
|
||||
tx_length = 0;
|
||||
tx_cause = CAUSE_INVALID_PARAMETER;
|
||||
|
||||
/* writes must use pagesize */
|
||||
} else if (tx_cmd == CMD_WRITE_MEMORY) {
|
||||
if (para_size == SPM_PAGESIZE) {
|
||||
write_flash_page();
|
||||
|
||||
} else {
|
||||
tx_cause = CAUSE_INVALID_PARAMETER;
|
||||
}
|
||||
}
|
||||
|
||||
} else if (para_memtype == MEMTYPE_EEPROM) {
|
||||
if ((para_address > (E2END +1)) || ((para_address + para_size) > (E2END +1))) {
|
||||
tx_cause = CAUSE_INVALID_PARAMETER;
|
||||
|
||||
} else if (tx_cmd == CMD_WRITE_MEMORY) {
|
||||
write_eeprom_page();
|
||||
}
|
||||
|
||||
} else {
|
||||
tx_length = 0;
|
||||
tx_cause = CAUSE_INVALID_PARAMETER;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
tx_cause = CAUSE_NOT_SUPPORTED;
|
||||
break;
|
||||
}
|
||||
|
||||
/* kickoff transmit */
|
||||
UCSRB |= (1<<UDRIE);
|
||||
}
|
||||
|
||||
rx_bcnt++;
|
||||
}
|
||||
}
|
||||
|
||||
ISR(USART_UDRE_vect)
|
||||
{
|
||||
if (tx_bcnt == 0) {
|
||||
/* enable RS485 transmitter */
|
||||
PORTD |= (1<<PORTD2);
|
||||
UCSRB &= ~(1<<TXB8);
|
||||
UDR = tx_cmd;
|
||||
|
||||
} else if (tx_bcnt == 1) {
|
||||
UDR = tx_cause;
|
||||
|
||||
} else if (tx_bcnt == 2) {
|
||||
UDR = (tx_length >> 8);
|
||||
|
||||
} else if (tx_bcnt == 3) {
|
||||
UDR = (tx_length & 0xFF);
|
||||
|
||||
} else if (tx_bcnt < (tx_length +4)) {
|
||||
uint16_t pos = tx_bcnt -4;
|
||||
uint8_t data = 0xFF;
|
||||
|
||||
if (tx_cmd == CMD_GET_VERSION) {
|
||||
data = info[pos];
|
||||
|
||||
} else if (tx_cmd == CMD_GET_CHIPINFO) {
|
||||
data = chipinfo[pos];
|
||||
|
||||
} else if (tx_cmd == CMD_READ_MEMORY) {
|
||||
if (para_memtype == MEMTYPE_FLASH) {
|
||||
data = pgm_read_byte_near(para_address);
|
||||
para_address++;
|
||||
|
||||
} else if (para_memtype == MEMTYPE_EEPROM) {
|
||||
data = read_eeprom_byte();
|
||||
para_address++;
|
||||
}
|
||||
}
|
||||
|
||||
UDR = data;
|
||||
|
||||
} else {
|
||||
/* stop transmit */
|
||||
UCSRB &= ~(1<<UDRIE);
|
||||
}
|
||||
|
||||
tx_bcnt++;
|
||||
}
|
||||
|
||||
ISR(USART_TXC_vect)
|
||||
{
|
||||
LED_GN_OFF();
|
||||
|
||||
/* disable RS485 transmitter */
|
||||
PORTD &= ~(1<<PORTD2);
|
||||
|
||||
/* enable MP mode again */
|
||||
UCSRA |= (1<<MPCM);
|
||||
rx_addressed = 0;
|
||||
|
||||
/* switch to application after everything is transmitted */
|
||||
if (tx_cmd == CMD_SWITCH_MODE) {
|
||||
boot_wait = BOOTWAIT_EXPIRED;
|
||||
}
|
||||
}
|
||||
|
||||
ISR(TIMER0_OVF_vect)
|
||||
{
|
||||
/* restart timer */
|
||||
TCNT0 = TIMER_RELOAD;
|
||||
|
||||
if (boot_wait == BOOTWAIT_RUNNING) {
|
||||
LED_GN_TOGGLE();
|
||||
|
||||
boot_timeout--;
|
||||
if (boot_timeout == 0) {
|
||||
boot_wait = BOOTWAIT_EXPIRED;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#if 0
|
||||
static void uart_send(char *p)
|
||||
{
|
||||
while (*p) {
|
||||
while (!(UCSRA & (1<<UDRE)));
|
||||
UDR = *p++;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
static void (*jump_to_app)(void) __attribute__ ((noreturn)) = 0x0000;
|
||||
|
||||
int main(void) __attribute__ ((noreturn));
|
||||
int main(void)
|
||||
{
|
||||
LED_INIT();
|
||||
LED_GN_OFF();
|
||||
|
||||
#if (BAUDRATE == 115200)
|
||||
OSCCAL = 0xAA;
|
||||
#elif (BAUDRATE == 9600)
|
||||
OSCCAL = 0xB8;
|
||||
#endif
|
||||
|
||||
/* move interrupt-vectors to bootloader */
|
||||
/* timer0: running with F_CPU/1024, OVF interrupt */
|
||||
#if defined (__AVR_ATmega32__)
|
||||
GICR = (1<<IVCE);
|
||||
GICR = (1<<IVSEL);
|
||||
|
||||
TCCR0 = (1<<CS02) | (1<<CS00);
|
||||
TIMSK = (1<<TOIE0);
|
||||
#endif
|
||||
|
||||
/* USART config */
|
||||
/* Multi Drop Mode, 9n1 */
|
||||
UCSRA = (1<<MPCM);
|
||||
UCSRB = (1<<RXEN) | (1<<TXEN) | (1<<RXCIE) | (1<<TXCIE) | (1<<UCSZ2);
|
||||
UCSRC = (1<<URSEL) | (1<<UCSZ1) | (1<<UCSZ0);
|
||||
UBRRH = (UART_CALC_BAUDRATE(BAUDRATE)>>8) & 0xFF;
|
||||
UBRRL = (UART_CALC_BAUDRATE(BAUDRATE) & 0xFF);
|
||||
|
||||
/* 11.354ms for 109 bits @9600 */
|
||||
/* 946.18us for 109 bits @115200 */
|
||||
// uart_send("1234567890");
|
||||
|
||||
sei();
|
||||
|
||||
while (boot_wait != BOOTWAIT_EXPIRED);
|
||||
|
||||
cli();
|
||||
|
||||
/* disable timer0 */
|
||||
/* move interrupt vectors back to application */
|
||||
#if defined (__AVR_ATmega32__)
|
||||
TCCR0 = 0x00;
|
||||
TIMSK = 0x00;
|
||||
|
||||
GICR = (1<<IVCE);
|
||||
GICR = (0<<IVSEL);
|
||||
#endif
|
||||
|
||||
LED_OFF();
|
||||
|
||||
uint16_t wait = 0x0000;
|
||||
do {
|
||||
__asm volatile ("nop");
|
||||
} while (--wait);
|
||||
|
||||
jump_to_app();
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user