razzor
/
twiboot
Watch 1
Star 0
Fork 0
Code Issues 2 Pull Requests 0 Releases 0 Wiki Activity
Browse Source

new protocol

pull/1/head
Olaf Rempel 9 years ago
parent
b39087eb8e
commit
e013aea33c
1 changed files with 157 additions and 91 deletions
Split View Show Diff Stats
  1. +157
    -91
      main.c

+ 157
- 91
main.c View File

@@ -1,5 +1,5 @@
/***************************************************************************
* Copyright (C) 09/2007 by Olaf Rempel *
* Copyright (C) 07/2010 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* This program is free software; you can redistribute it and/or modify *
@@ -24,66 +24,102 @@
#define F_CPU 8000000
#include <util/delay.h>

/*
* atmega88:
* Fuse E: 0xfa (512 words bootloader)
* Fuse H: 0xdd (2.7V BOD)
* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
*/

/* 25ms @8MHz */
#define TIMER_RELOAD (0xFF - 195)

/* 40 * 25ms */
#define TIMEOUT 40

#define LED_RT (1<<PORTB4)
#define LED_GN (1<<PORTB5)

#define TWI_ADDRESS 0x21

#define COOKIE 0x4711
#define APP_END 0x1C00

#define VERSION_STRING "TWIBOOT m88-v20"
#define SIGNATURE_BYTES { 0x1E, 0x93, 0x0A, 0x00 }

/* SLA+R */
#define CMD_WAIT 0x00
#define CMD_GET_INFO 0x10
#define CMD_GET_SIGNATURE 0x11
#define CMD_WRITE_FLASH 0x12
#define CMD_READ_FLASH 0x13
#define CMD_WRITE_EEPROM 0x14
#define CMD_READ_EEPROM 0x15
#define CMD_BOOT_APPLICATION 0x1F
#define CMD_READ_VERSION 0x01
#define CMD_READ_MEMORY 0x02
/* internal mappings */
#define CMD_READ_SIGNATURE (0x10 | CMD_READ_MEMORY)
#define CMD_READ_FLASH (0x20 | CMD_READ_MEMORY)
#define CMD_READ_EEPROM (0x30 | CMD_READ_MEMORY)
#define CMD_READ_PARAMETERS (0x40 | CMD_READ_MEMORY) /* only in APP */

/* SLA+W */
#define CMD_SWITCH_APPLICATION CMD_READ_VERSION
#define CMD_WRITE_MEMORY CMD_READ_MEMORY
/* internal mappings */
#define CMD_BOOT_BOOTLOADER (0x10 | CMD_SWITCH_APPLICATION) /* only in APP */
#define CMD_BOOT_APPLICATION (0x20 | CMD_SWITCH_APPLICATION)
#define CMD_WRITE_SIGNATURE (0x10 | CMD_WRITE_MEMORY)
#define CMD_WRITE_FLASH (0x20 | CMD_WRITE_MEMORY)
#define CMD_WRITE_EEPROM (0x30 | CMD_WRITE_MEMORY)
#define CMD_WRITE_PARAMETERS (0x40 | CMD_WRITE_MEMORY) /* only in APP */

/* CMD_SWITCH_APPLICATION parameter */
#define BOOTTYPE_BOOTLOADER 0x00 /* only in APP */
#define BOOTTYPE_APPLICATION 0x80

/* CMD_{READ|WRITE}_* parameter */
#define MEMTYPE_SIGNATURE 0x00
#define MEMTYPE_FLASH 0x01
#define MEMTYPE_EEPROM 0x02
#define MEMTYPE_PARAMETERS 0x03 /* only in APP */

/*
* LED on PORTB4 blinks with 20Hz (while bootloader is running)
* LED on PORTB5 blinks on TWI activity
*
* Fuse E: 0xfa (512 words bootloader)
* Fuse H: 0xdd (2.7V BOD)
* Fuse L: 0xc2 (8Mhz internal RC-Osz.)
* LED_GN blinks with 20Hz (while bootloader is running)
* LED_RT blinks on TWI activity
*
* bootloader twi-protocol:
* - get info about bootloader:
* SLA+W, 0x10, SLA+R, {16 bytes}, STO
* - abort boot timeout:
* SLA+W, 0x00, STO
*
* - get signature bytes:
* SLA+W, 0x11, SLA+R, {4 bytes}, STO
* - show bootloader version
* SLA+W, 0x01, SLA+R, {16 bytes}, STO
*
* - write one flash page (64bytes on mega8)
* SLA+W, 0x12, addrh, addrl, 0x47, 0x11, {64 bytes}, STO
* - start application
* SLA+W, 0x01, 0x80, STO
*
* - read one (or more) flash bytes
* SLA+W, 0x13, addrh, addrl, SLA+R, {* bytes}, STO
* - read signature bytes
* SLA+W, 0x02, 0x00, SLA+R, {4 bytes}, STO
*
* - write one (or more) eeprom bytes
* SLA+W, 0x14, addrh, addrl, 0x47, 0x11, {* bytes}, STO
* - read one (or more) flash bytes
* SLA+W, 0x02, 0x01, addrh, addrl, SLA+R, {* bytes}, STO
*
* - read one (or more) eeprom bytes
* SLA+W, 0x15, addrh, addrl, SLA+R, {* bytes}, STO
* SLA+W, 0x02, 0x02, addrh, addrl, SLA+R, {* bytes}, STO
*
* - write one flash page (64bytes on mega8)
* SLA+W, 0x02, 0x01, addrh, addrl, {64 bytes}, STO
*
* - boot application
* SLA+W, 0x1F, STO
* - write one (or more) eeprom bytes
* SLA+W, 0x02, 0x02, addrh, addrl, {* bytes}, STO
*/

const static uint8_t info[16] = "TWIBOOT m88-v12";
const static uint8_t signature[4] = { 0x1E, 0x93, 0x0A, 0x00 };
const static uint8_t info[16] = VERSION_STRING;
const static uint8_t signature[4] = SIGNATURE_BYTES;

/* wait 40 * 25ms = 1s */
static uint8_t boot_timeout = 40;
static uint8_t boot_timeout = TIMEOUT;
volatile static uint8_t cmd = CMD_WAIT;

/* flash buffer */
static uint8_t buf[SPM_PAGESIZE];
static uint16_t addr;

void write_flash_page(void)
static void write_flash_page(void)
{
uint16_t pagestart = addr;
uint8_t size = SPM_PAGESIZE;
@@ -109,7 +145,16 @@ void write_flash_page(void)
boot_rww_enable();
}

void write_eeprom_byte(uint8_t val)
static uint8_t read_eeprom_byte(void)
{
EEARL = addr;
EEARH = (addr >> 8);
EECR |= (1<<EERE);
addr++;
return EEDR;
}

static void write_eeprom_byte(uint8_t val)
{
EEARL = addr;
EEARH = (addr >> 8);
@@ -123,7 +168,9 @@ void write_eeprom_byte(uint8_t val)

ISR(TWI_vect)
{
static uint8_t bcnt = 0;
static uint8_t bcnt;
uint8_t data;
uint8_t ack = (1<<TWEA);

switch (TWSR & 0xF8) {
/* SLA+W received, ACK returned -> receive data and ACK */
@@ -135,64 +182,87 @@ ISR(TWI_vect)

/* prev. SLA+W, data received, ACK returned -> receive data and ACK */
case 0x80:
if (bcnt == 0) {
cmd = TWDR;
switch (cmd) {
case CMD_GET_INFO:
case CMD_GET_SIGNATURE:
case CMD_WRITE_FLASH:
case CMD_READ_FLASH:
case CMD_WRITE_EEPROM:
case CMD_READ_EEPROM:
data = TWDR;
switch (bcnt) {
case 0:
switch (data) {
case CMD_SWITCH_APPLICATION:
case CMD_WRITE_MEMORY:
bcnt++;
/* no break */

case CMD_WAIT:
/* abort countdown */
boot_timeout = 0;

case CMD_BOOT_APPLICATION:
bcnt++;
break;

default:
cmd = CMD_WAIT;
bcnt = 0;
/* boot app now */
data = CMD_BOOT_APPLICATION;
ack = (0<<TWEA);
break;
}
cmd = data;
break;

} else if (bcnt == 1) {
addr = (TWDR << 8);
bcnt++;

} else if (bcnt == 2) {
addr |= TWDR;
bcnt++;
case 1:
switch (cmd) {
case CMD_SWITCH_APPLICATION:
if (data == BOOTTYPE_APPLICATION) {
cmd = CMD_BOOT_APPLICATION;
}
ack = (0<<TWEA);
break;

} else if (bcnt == 3) {
if (TWDR == (COOKIE >> 8))
case CMD_WRITE_MEMORY:
bcnt++;
else
bcnt = 0;
if (data == MEMTYPE_SIGNATURE) {
cmd = CMD_WRITE_SIGNATURE;

} else if (bcnt == 4) {
if (TWDR == (COOKIE & 0xFF))
bcnt++;
else
bcnt = 0;
} else if (data == MEMTYPE_FLASH) {
cmd = CMD_WRITE_FLASH;

} else if (bcnt >= 5 && cmd == CMD_WRITE_FLASH) {
buf[bcnt -5] = TWDR;
if (bcnt < sizeof(buf) +4) {
bcnt++;
} else if (data == MEMTYPE_EEPROM) {
cmd = CMD_WRITE_EEPROM;

} else {
write_flash_page();
bcnt = 0;
} else {
ack = (0<<TWEA);
}
break;
}
break;

} else if (bcnt >= 5 && cmd == CMD_WRITE_EEPROM) {
write_eeprom_byte(TWDR);
case 2:
case 3:
addr <<= 8;
addr |= data;
bcnt++;
break;

default:
switch (cmd) {
case CMD_WRITE_FLASH:
buf[bcnt -4] = data;
if (bcnt < sizeof(buf) +3) {
bcnt++;
} else {
write_flash_page();
ack = (0<<TWEA);
}
break;

case CMD_WRITE_EEPROM:
write_eeprom_byte(data);
bcnt++;
break;
}
break;
}

TWCR |= (1<<TWINT) | (1<<TWEA);
if (ack == 0x00)
bcnt = 0;

TWCR |= (1<<TWINT) | ack;
break;

/* SLA+R received, ACK returned -> send data */
@@ -203,33 +273,30 @@ ISR(TWI_vect)
/* prev. SLA+R, data sent, ACK returned -> send data */
case 0xB8:
switch (cmd) {
case CMD_GET_INFO:
TWDR = info[bcnt++];
case CMD_READ_VERSION:
data = info[bcnt++];
bcnt %= sizeof(info);
break;

case CMD_GET_SIGNATURE:
TWDR = signature[bcnt++];
case CMD_READ_SIGNATURE:
data = signature[bcnt++];
bcnt %= sizeof(signature);
break;

case CMD_READ_FLASH:
TWDR = pgm_read_byte_near(addr++);
data = pgm_read_byte_near(addr++);
break;

case CMD_READ_EEPROM:
EEARL = addr;
EEARH = (addr >> 8);
EECR |= (1<<EERE);
addr++;
TWDR = EEDR;
data = read_eeprom_byte();
break;

default:
TWDR = 0xFF;
data = 0xFF;
break;
}

TWDR = data;
TWCR |= (1<<TWINT) | (1<<TWEA);
break;

@@ -250,8 +317,8 @@ ISR(TWI_vect)

ISR(TIMER0_OVF_vect)
{
/* come back in 25ms (@8MHz) */
TCNT0 = 0xFF - 195;
/* restart timer */
TCNT0 = TIMER_RELOAD;

/* blink LED while running */
PORTB ^= LED_GN;
@@ -316,10 +383,9 @@ int main(void)

PORTB = 0x00;

_delay_ms(25);
_delay_ms(25);
_delay_ms(25);
_delay_ms(25);
uint8_t i;
for (i = 0; i < 10; i++)
_delay_ms(10);

jump_to_app();
return 0;

Write Preview
Loading…
Cancel
Save