new protocol
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b39087eb8e
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e013aea33c
248
main.c
248
main.c
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@ -1,5 +1,5 @@
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/***************************************************************************
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* Copyright (C) 09/2007 by Olaf Rempel *
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* Copyright (C) 07/2010 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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@ -24,66 +24,102 @@
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#define F_CPU 8000000
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#include <util/delay.h>
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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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/* 25ms @8MHz */
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#define TIMER_RELOAD (0xFF - 195)
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/* 40 * 25ms */
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#define TIMEOUT 40
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#define LED_RT (1<<PORTB4)
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#define LED_GN (1<<PORTB5)
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#define TWI_ADDRESS 0x21
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#define COOKIE 0x4711
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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_GET_INFO 0x10
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#define CMD_GET_SIGNATURE 0x11
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#define CMD_WRITE_FLASH 0x12
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#define CMD_READ_FLASH 0x13
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#define CMD_WRITE_EEPROM 0x14
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#define CMD_READ_EEPROM 0x15
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#define CMD_BOOT_APPLICATION 0x1F
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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_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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/* SLA+W */
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#define CMD_SWITCH_APPLICATION CMD_READ_VERSION
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#define CMD_WRITE_MEMORY CMD_READ_MEMORY
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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_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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/* CMD_SWITCH_APPLICATION parameter */
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#define BOOTTYPE_BOOTLOADER 0x00 /* only in APP */
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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_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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/*
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* LED on PORTB4 blinks with 20Hz (while bootloader is running)
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* LED on PORTB5 blinks on TWI activity
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*
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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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* LED_GN blinks with 20Hz (while bootloader is running)
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* LED_RT blinks on TWI activity
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*
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* bootloader twi-protocol:
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* - get info about bootloader:
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* SLA+W, 0x10, SLA+R, {16 bytes}, STO
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* - abort boot timeout:
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* SLA+W, 0x00, STO
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*
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* - get signature bytes:
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* SLA+W, 0x11, SLA+R, {4 bytes}, STO
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* - show bootloader version
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* SLA+W, 0x01, SLA+R, {16 bytes}, STO
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*
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* - write one flash page (64bytes on mega8)
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* SLA+W, 0x12, addrh, addrl, 0x47, 0x11, {64 bytes}, STO
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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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* 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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* SLA+W, 0x13, addrh, addrl, SLA+R, {* bytes}, STO
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*
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* - write one (or more) eeprom bytes
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* SLA+W, 0x14, addrh, addrl, 0x47, 0x11, {* bytes}, STO
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* SLA+W, 0x02, 0x01, addrh, addrl, SLA+R, {* bytes}, STO
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*
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* - read one (or more) eeprom bytes
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* SLA+W, 0x15, addrh, addrl, SLA+R, {* bytes}, STO
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* SLA+W, 0x02, 0x02, addrh, addrl, SLA+R, {* bytes}, STO
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*
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* - boot application
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* SLA+W, 0x1F, STO
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* - write one flash page (64bytes on mega8)
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* SLA+W, 0x02, 0x01, addrh, addrl, {64 bytes}, STO
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*
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* - write one (or more) eeprom bytes
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* SLA+W, 0x02, 0x02, addrh, addrl, {* bytes}, STO
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*/
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const static uint8_t info[16] = "TWIBOOT m88-v12";
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const static uint8_t signature[4] = { 0x1E, 0x93, 0x0A, 0x00 };
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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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/* wait 40 * 25ms = 1s */
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static uint8_t boot_timeout = 40;
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static uint8_t boot_timeout = TIMEOUT;
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volatile static uint8_t cmd = CMD_WAIT;
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/* flash buffer */
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static uint8_t buf[SPM_PAGESIZE];
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static uint16_t addr;
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void write_flash_page(void)
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static void write_flash_page(void)
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{
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uint16_t pagestart = addr;
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uint8_t size = SPM_PAGESIZE;
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@ -109,7 +145,16 @@ void write_flash_page(void)
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boot_rww_enable();
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}
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void write_eeprom_byte(uint8_t val)
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static uint8_t read_eeprom_byte(void)
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{
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EEARL = addr;
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EEARH = (addr >> 8);
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EECR |= (1<<EERE);
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addr++;
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return EEDR;
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}
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static void write_eeprom_byte(uint8_t val)
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{
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EEARL = addr;
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EEARH = (addr >> 8);
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@ -123,7 +168,9 @@ void write_eeprom_byte(uint8_t val)
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ISR(TWI_vect)
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{
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static uint8_t bcnt = 0;
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static uint8_t bcnt;
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uint8_t data;
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uint8_t ack = (1<<TWEA);
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switch (TWSR & 0xF8) {
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/* SLA+W received, ACK returned -> receive data and ACK */
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@ -135,64 +182,87 @@ ISR(TWI_vect)
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/* prev. SLA+W, data received, ACK returned -> receive data and ACK */
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case 0x80:
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if (bcnt == 0) {
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cmd = TWDR;
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switch (cmd) {
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case CMD_GET_INFO:
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case CMD_GET_SIGNATURE:
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case CMD_WRITE_FLASH:
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case CMD_READ_FLASH:
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case CMD_WRITE_EEPROM:
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case CMD_READ_EEPROM:
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data = TWDR;
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switch (bcnt) {
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case 0:
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switch (data) {
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case CMD_SWITCH_APPLICATION:
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case CMD_WRITE_MEMORY:
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bcnt++;
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/* no break */
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case CMD_WAIT:
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/* abort countdown */
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boot_timeout = 0;
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case CMD_BOOT_APPLICATION:
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bcnt++;
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break;
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default:
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cmd = CMD_WAIT;
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bcnt = 0;
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/* boot app now */
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data = CMD_BOOT_APPLICATION;
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ack = (0<<TWEA);
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break;
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}
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cmd = data;
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break;
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} else if (bcnt == 1) {
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addr = (TWDR << 8);
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bcnt++;
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case 1:
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switch (cmd) {
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case CMD_SWITCH_APPLICATION:
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if (data == BOOTTYPE_APPLICATION) {
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cmd = CMD_BOOT_APPLICATION;
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}
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ack = (0<<TWEA);
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break;
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} else if (bcnt == 2) {
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addr |= TWDR;
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bcnt++;
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} else if (bcnt == 3) {
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if (TWDR == (COOKIE >> 8))
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case CMD_WRITE_MEMORY:
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bcnt++;
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else
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bcnt = 0;
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if (data == MEMTYPE_SIGNATURE) {
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cmd = CMD_WRITE_SIGNATURE;
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} else if (bcnt == 4) {
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if (TWDR == (COOKIE & 0xFF))
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bcnt++;
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else
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bcnt = 0;
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} else if (data == MEMTYPE_FLASH) {
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cmd = CMD_WRITE_FLASH;
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} else if (bcnt >= 5 && cmd == CMD_WRITE_FLASH) {
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buf[bcnt -5] = TWDR;
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if (bcnt < sizeof(buf) +4) {
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bcnt++;
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} else if (data == MEMTYPE_EEPROM) {
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cmd = CMD_WRITE_EEPROM;
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} else {
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write_flash_page();
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bcnt = 0;
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} else {
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ack = (0<<TWEA);
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}
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break;
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}
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break;
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} else if (bcnt >= 5 && cmd == CMD_WRITE_EEPROM) {
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write_eeprom_byte(TWDR);
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case 2:
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case 3:
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addr <<= 8;
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addr |= data;
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bcnt++;
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break;
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default:
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switch (cmd) {
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case CMD_WRITE_FLASH:
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buf[bcnt -4] = data;
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if (bcnt < sizeof(buf) +3) {
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bcnt++;
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} else {
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write_flash_page();
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ack = (0<<TWEA);
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}
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break;
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case CMD_WRITE_EEPROM:
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write_eeprom_byte(data);
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bcnt++;
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break;
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}
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break;
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}
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TWCR |= (1<<TWINT) | (1<<TWEA);
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if (ack == 0x00)
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bcnt = 0;
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TWCR |= (1<<TWINT) | ack;
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break;
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/* SLA+R received, ACK returned -> send data */
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@ -203,33 +273,30 @@ ISR(TWI_vect)
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/* prev. SLA+R, data sent, ACK returned -> send data */
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case 0xB8:
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switch (cmd) {
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case CMD_GET_INFO:
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TWDR = info[bcnt++];
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case CMD_READ_VERSION:
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data = info[bcnt++];
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bcnt %= sizeof(info);
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break;
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case CMD_GET_SIGNATURE:
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TWDR = signature[bcnt++];
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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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break;
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case CMD_READ_FLASH:
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TWDR = pgm_read_byte_near(addr++);
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data = pgm_read_byte_near(addr++);
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break;
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case CMD_READ_EEPROM:
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EEARL = addr;
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EEARH = (addr >> 8);
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EECR |= (1<<EERE);
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addr++;
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TWDR = EEDR;
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data = read_eeprom_byte();
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break;
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default:
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TWDR = 0xFF;
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data = 0xFF;
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break;
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}
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TWDR = data;
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TWCR |= (1<<TWINT) | (1<<TWEA);
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break;
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@ -250,8 +317,8 @@ ISR(TWI_vect)
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ISR(TIMER0_OVF_vect)
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{
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/* come back in 25ms (@8MHz) */
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TCNT0 = 0xFF - 195;
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/* restart timer */
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TCNT0 = TIMER_RELOAD;
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/* blink LED while running */
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PORTB ^= LED_GN;
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@ -316,10 +383,9 @@ int main(void)
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PORTB = 0x00;
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_delay_ms(25);
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_delay_ms(25);
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_delay_ms(25);
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_delay_ms(25);
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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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