multicpu support
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parent
e013aea33c
commit
f73b52bc3c
26
Makefile
26
Makefile
@ -3,12 +3,25 @@ OBJ = main.o
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MCU_TARGET = atmega88
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OPTIMIZE = -Os
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DEFS =
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ifeq ($(MCU_TARGET), atmega8)
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BOOTLOADER_START=0x1C00
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AVRDUDE_MCU=m8
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endif
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ifeq ($(MCU_TARGET), atmega88)
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BOOTLOADER_START=0x1C00
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AVRDUDE_MCU=m88
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endif
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ifeq ($(MCU_TARGET), atmega168)
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BOOTLOADER_START=0x3C00
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AVRDUDE_MCU=m168
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endif
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DEFS = -DAPP_END=$(BOOTLOADER_START)
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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=0x1C00
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override LDFLAGS = -Wl,-Map,$(PRG).map,--section-start=.text=$(BOOTLOADER_START)
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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@ -21,6 +34,9 @@ all: $(PRG).elf lst text
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$(PRG).elf: $(OBJ)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
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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 *.lst *.map $(PRG).elf *.hex *.bin
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@ -41,7 +57,9 @@ bin: $(PRG).bin
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$(OBJCOPY) -j .text -j .data -O binary $< $@
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install: text
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avrdude -c dragon_isp -P usb -p m88 -U flash:w:$(PRG).hex
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avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U flash:w:$(PRG).hex
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fuses:
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avrdude -c dragon_isp -P usb -p m88 -U lfuse:w:0xc2:m -U hfuse:w:0xdd:m -U efuse:w:0xfa:m
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avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U lfuse:w:0xc2:m
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avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U hfuse:w:0xdd:m
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avrdude -c dragon_isp -P usb -p $(AVRDUDE_MCU) -U efuse:w:0xfa:m
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101
main.c
101
main.c
@ -1,5 +1,5 @@
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/***************************************************************************
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* Copyright (C) 07/2010 by Olaf Rempel *
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* Copyright (C) 08/2010 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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@ -25,12 +25,38 @@
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#include <util/delay.h>
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/*
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* atmega8:
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* Fuse E: 0xfa (512 words bootloader)
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* Fuse H: 0xdd (2.7V BOD)
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* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
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*
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* atmega88:
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* Fuse E: 0xfa (512 words bootloader)
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* Fuse H: 0xdd (2.7V BOD)
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* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
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*
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* atmega168:
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* Fuse E: 0xfa (512 words bootloader)
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* Fuse H: 0xdd (2.7V BOD)
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* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
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*/
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#if defined (__AVR_ATmega8__)
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#define VERSION_STRING "TWIBOOT m8v2.0"
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#define SIGNATURE_BYTES 0x1E, 0x93, 0x07
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#elif defined (__AVR_ATmega88__)
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#define VERSION_STRING "TWIBOOT m88v2.0"
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#define SIGNATURE_BYTES 0x1E, 0x93, 0x0A
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#elif defined (__AVR_ATmega168__)
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#define VERSION_STRING "TWIBOOT m168v2.0"
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#define SIGNATURE_BYTES 0x1E, 0x94, 0x06
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#else
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#error MCU not supported
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#endif
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/* 25ms @8MHz */
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#define TIMER_RELOAD (0xFF - 195)
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@ -42,17 +68,12 @@
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#define TWI_ADDRESS 0x21
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#define APP_END 0x1C00
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#define VERSION_STRING "TWIBOOT m88-v20"
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#define SIGNATURE_BYTES { 0x1E, 0x93, 0x0A, 0x00 }
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/* SLA+R */
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#define CMD_WAIT 0x00
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#define CMD_READ_VERSION 0x01
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#define CMD_READ_MEMORY 0x02
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/* internal mappings */
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#define CMD_READ_SIGNATURE (0x10 | CMD_READ_MEMORY)
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#define CMD_READ_CHIPINFO (0x10 | CMD_READ_MEMORY)
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#define CMD_READ_FLASH (0x20 | CMD_READ_MEMORY)
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#define CMD_READ_EEPROM (0x30 | CMD_READ_MEMORY)
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#define CMD_READ_PARAMETERS (0x40 | CMD_READ_MEMORY) /* only in APP */
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@ -63,7 +84,7 @@
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/* internal mappings */
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#define CMD_BOOT_BOOTLOADER (0x10 | CMD_SWITCH_APPLICATION) /* only in APP */
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#define CMD_BOOT_APPLICATION (0x20 | CMD_SWITCH_APPLICATION)
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#define CMD_WRITE_SIGNATURE (0x10 | CMD_WRITE_MEMORY)
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#define CMD_WRITE_CHIPINFO (0x10 | CMD_WRITE_MEMORY) /* invalid */
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#define CMD_WRITE_FLASH (0x20 | CMD_WRITE_MEMORY)
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#define CMD_WRITE_EEPROM (0x30 | CMD_WRITE_MEMORY)
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#define CMD_WRITE_PARAMETERS (0x40 | CMD_WRITE_MEMORY) /* only in APP */
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@ -73,7 +94,7 @@
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#define BOOTTYPE_APPLICATION 0x80
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/* CMD_{READ|WRITE}_* parameter */
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#define MEMTYPE_SIGNATURE 0x00
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#define MEMTYPE_CHIPINFO 0x00
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#define MEMTYPE_FLASH 0x01
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#define MEMTYPE_EEPROM 0x02
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#define MEMTYPE_PARAMETERS 0x03 /* only in APP */
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@ -92,7 +113,7 @@
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* - start application
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* SLA+W, 0x01, 0x80, STO
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*
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* - read signature bytes
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* - read chip info: 3byte signature, 1byte page size, 2byte flash size, 2byte eeprom size
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* SLA+W, 0x02, 0x00, SLA+R, {4 bytes}, STO
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*
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* - read one (or more) flash bytes
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@ -109,7 +130,17 @@
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*/
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const static uint8_t info[16] = VERSION_STRING;
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const static uint8_t signature[4] = SIGNATURE_BYTES;
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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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(APP_END >> 8) & 0xFF,
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APP_END & 0xFF,
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(E2END >> 8 & 0xFF),
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E2END & 0xFF
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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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@ -160,9 +191,13 @@ static void write_eeprom_byte(uint8_t val)
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EEARH = (addr >> 8);
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EEDR = val;
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addr++;
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#if defined (__AVR_ATmega8__)
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EECR |= (1<<EEMWE);
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EECR |= (1<<EEWE);
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#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
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EECR |= (1<<EEMPE);
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EECR |= (1<<EEPE);
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#endif
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eeprom_busy_wait();
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}
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@ -216,8 +251,8 @@ ISR(TWI_vect)
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case CMD_WRITE_MEMORY:
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bcnt++;
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if (data == MEMTYPE_SIGNATURE) {
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cmd = CMD_WRITE_SIGNATURE;
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if (data == MEMTYPE_CHIPINFO) {
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cmd = CMD_WRITE_CHIPINFO;
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} else if (data == MEMTYPE_FLASH) {
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cmd = CMD_WRITE_FLASH;
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@ -229,6 +264,10 @@ ISR(TWI_vect)
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ack = (0<<TWEA);
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}
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break;
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default:
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ack = (0<<TWEA);
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break;
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}
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break;
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@ -255,6 +294,10 @@ ISR(TWI_vect)
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write_eeprom_byte(data);
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bcnt++;
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break;
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default:
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ack = (0<<TWEA);
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break;
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}
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break;
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}
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@ -278,9 +321,9 @@ ISR(TWI_vect)
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bcnt %= sizeof(info);
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break;
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case CMD_READ_SIGNATURE:
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data = signature[bcnt++];
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bcnt %= sizeof(signature);
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case CMD_READ_CHIPINFO:
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data = chipinfo[bcnt++];
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bcnt %= sizeof(chipinfo);
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break;
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case CMD_READ_FLASH:
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@ -332,13 +375,14 @@ ISR(TIMER0_OVF_vect)
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cmd = CMD_BOOT_APPLICATION;
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}
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static void (*jump_to_app)(void) = 0x0000;
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static void (*jump_to_app)(void) __attribute__ ((noreturn)) = 0x0000;
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/*
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* For newer devices (mega88) the watchdog timer remains active even after a
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* system reset. So disable it as soon as possible.
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* automagically called on startup
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*/
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#if defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
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void disable_wdt_timer(void) __attribute__((naked, section(".init3")));
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void disable_wdt_timer(void)
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{
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@ -346,7 +390,9 @@ void disable_wdt_timer(void)
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WDTCSR = (1<<WDCE) | (1<<WDE);
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WDTCSR = (0<<WDE);
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}
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#endif
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int main(void) __attribute__ ((noreturn));
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int main(void)
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{
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DDRB = LED_GN | LED_RT;
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@ -356,11 +402,14 @@ int main(void)
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MCUCR = (1<<IVCE);
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MCUCR = (1<<IVSEL);
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/* timer0: running with F_CPU/1024 */
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/* timer0: running with F_CPU/1024, OVF interrupt */
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#if defined (__AVR_ATmega8__)
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TCCR0 = (1<<CS02) | (1<<CS00);
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TIMSK = (1<<TOIE0);
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#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
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TCCR0B = (1<<CS02) | (1<<CS00);
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/* enable timer0 OVF interrupt */
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TIMSK0 = (1<<TOIE0);
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#endif
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/* TWI init: set address, auto ACKs with interrupts */
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TWAR = (TWI_ADDRESS<<1);
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@ -374,8 +423,13 @@ int main(void)
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TWCR = 0x00;
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/* disable timer0 */
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#if defined (__AVR_ATmega8__)
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TCCR0 = 0x00;
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TIMSK = 0x00;
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#elif defined (__AVR_ATmega88__) || defined (__AVR_ATmega168__)
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TIMSK0 = 0x00;
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TCCR0B = 0x00;
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#endif
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/* move interrupt vectors back to application */
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MCUCR = (1<<IVCE);
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@ -383,10 +437,5 @@ int main(void)
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PORTB = 0x00;
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uint8_t i;
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for (i = 0; i < 10; i++)
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_delay_ms(10);
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jump_to_app();
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return 0;
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}
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