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xboot.c
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xboot.c
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/************************************************************************/
/* XBoot Extensible AVR Bootloader */
/* */
/* tested with ATXMEGA64A3, ATXMEGA128A1, ATXMEGA256A1, ATXMEGA32A4 */
/* */
/* xboot.c */
/* */
/* Alex Forencich <[email protected]> */
/* */
/* Copyright (c) 2010 Alex Forencich */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files(the "Software"), to deal in the Software without restriction, */
/* including without limitation the rights to use, copy, modify, merge, */
/* publish, distribute, sublicense, and/or sell copies of the Software, */
/* and to permit persons to whom the Software is furnished to do so, */
/* subject to the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */
/* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS */
/* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN */
/* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN */
/* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */
/* SOFTWARE. */
/* */
/************************************************************************/
#include "xboot.h"
#ifdef USE_INTERRUPTS
volatile unsigned char comm_mode;
volatile unsigned char rx_buff0;
volatile unsigned char rx_buff1;
volatile unsigned char rx_char_cnt;
volatile unsigned char tx_buff0;
volatile unsigned char tx_char_cnt;
#else
#ifdef __AVR_XMEGA__
unsigned char comm_mode;
#else // __AVR_XMEGA__
// Force data section on atmega
// Seems to be a bug in newer versions of gcc
// this ensures .bss is placed after .data
unsigned char comm_mode = 1;
#endif // __AVR_XMEGA__
#endif // USE_INTERRUPTS
unsigned char buffer[SPM_PAGESIZE];
#ifdef NEED_CODE_PROTECTION
unsigned char protected;
#endif // NEED_CODE_PROTECTION
// Main code
int main(void)
{
ADDR_T address = 0;
unsigned char in_bootloader = 0;
unsigned char val = 0;
int i = 0;
uint32_t j;
uint8_t k;
#ifdef NEED_CODE_PROTECTION
protected = 1;
#endif // NEED_CODE_PROTECTION
#ifdef USE_I2C_ADDRESS_NEGOTIATION
unsigned short devid_bit;
#endif // USE_I2C_ADDRESS_NEGOTIATION
comm_mode = MODE_UNDEF;
#ifdef USE_INTERRUPTS
rx_char_cnt = 0;
tx_char_cnt = 0;
#endif // USE_INTERRUPTS
// Initialization section
// Entry point and communication methods are initialized here
// --------------------------------------------------
#ifdef __AVR_XMEGA__
#ifdef USE_32MHZ_RC
#if (F_CPU != 32000000L)
#error F_CPU must match oscillator setting!
#endif // F_CPU
OSC.CTRL |= OSC_RC32MEN_bm; // turn on 32 MHz oscillator
while (!(OSC.STATUS & OSC_RC32MRDY_bm)) { }; // wait for it to start
CCP = CCP_IOREG_gc;
CLK.CTRL = CLK_SCLKSEL_RC32M_gc;
#ifdef USE_DFLL
DFLLRC32M.CTRL = DFLL_ENABLE_bm;
#endif // USE_DFLL
#else // USE_32MHZ_RC
#if (F_CPU != 2000000L)
#error F_CPU must match oscillator setting!
#endif // F_CPU
#ifdef USE_DFLL
DFLLRC2M.CTRL = DFLL_ENABLE_bm;
#endif // USE_DFLL
#endif // USE_32MHZ_RC
#else // __AVR_XMEGA__
// nothing special for ATmega
#endif // __AVR_XMEGA__
// interrupts
#ifdef __AVR_XMEGA__
#ifdef NEED_INTERRUPTS
// remap interrupts to boot section
CCP = CCP_IOREG_gc;
#ifdef USE_INTERRUPTS
PMIC.CTRL = PMIC_IVSEL_bm | PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm;
#else
PMIC.CTRL = PMIC_IVSEL_bm;
#endif // USE_INTERRUPTS
#endif // NEED_INTERRUPTS
#else // __AVR_XMEGA__
// nothing special for ATmega
#endif // __AVR_XMEGA__
// LED
#ifdef __AVR_XMEGA__
#ifdef USE_LED
// Initialize LED pin
LED_PORT.DIRSET = (1 << LED_PIN);
#if LED_PIN_INV
LED_PORT.OUTCLR = (1 << LED_PIN);
#else
LED_PORT.OUTSET = (1 << LED_PIN);
#endif // LED_PIN_INV
#endif // USE_LED
#else // __AVR_XMEGA__
#ifdef USE_LED
// Initialize LED pin
LED_PORT_DDR |= (1 << LED_PIN);
#if LED_PIN_INV
LED_PORT &= ~(1 << LED_PIN);
#else
LED_PORT |= (1 << LED_PIN);
#endif // LED_PIN_INV
#endif // USE_LED
#endif // __AVR_XMEGA__
// I2C Attach LED_PIN
#ifdef __AVR_XMEGA__
#ifdef USE_I2C_ADDRESS_NEGOTIATION
#ifdef USE_ATTACH_LED
// Initialize ATTACH_LED
ATTACH_LED_PORT.DIRSET = (1 << ATTACH_LED_PIN);
#if ATTACH_LED_INV
ATTACH_LED_PORT.OUTSET = (1 << ATTACH_LED_PIN);
#else
ATTACH_LED_PORT.OUTCLR = (1 << ATTACH_LED_PIN);
#endif // ATTACH_LED_INV
#endif // USE_ATTACH_LED
#endif // USE_I2C_ADDRESS_NEGOTIATION
#else // __AVR_XMEGA__
#ifdef USE_I2C_ADDRESS_NEGOTIATION
#ifdef USE_ATTACH_LED
// Initialize ATTACH_LED
ATTACH_LED_PORT_DDR |= (1 << ATTACH_LED_PIN);
#if ATTACH_LED_INV
ATTACH_LED_PORT |= (1 << ATTACH_LED_PIN);
#else
ATTACH_LED_PORT &= ~(1 << ATTACH_LED_PIN);
#endif // ATTACH_LED_INV
#endif // USE_ATTACH_LED
#endif // USE_I2C_ADDRESS_NEGOTIATION
#endif // __AVR_XMEGA__
// Enter pin
#ifdef __AVR_XMEGA__
#ifdef USE_ENTER_PIN
// Make sure it's an input
ENTER_PORT.DIRCLR = (1 << ENTER_PIN);
#if ENTER_PIN_PUEN
// Enable bootloader entry pin pullup
ENTER_PIN_CTRL = 0x18;
#endif // ENTER_PIN_PUEN
#endif // USE_ENTER_PIN
#else // __AVR_XMEGA__
#ifdef USE_ENTER_PIN
// Make sure it's an input
ENTER_PORT_DDR &= ~(1 << ENTER_PIN);
#if ENTER_PIN_PUEN
// Enable bootloader entry pin pullup
ENTER_PORT |= (1 << ENTER_PIN);
#else // ENER_PIN_PUEN
// Disable bootloader entry pin pullup
ENTER_PORT &= ~(1 << ENTER_PIN);
#endif // ENTER_PIN_PUEN
#endif // USE_ENTER_PIN
#endif // __AVR_XMEGA__
#ifdef USE_UART
// Initialize UART
uart_init();
// Initialize RX pin pull-up
#ifdef __AVR_XMEGA__
#ifdef UART_RX_PUEN
// Enable RX pin pullup
UART_RX_PIN_CTRL = 0x18;
#endif // UART_RX_PUEN
#else // __AVR_XMEGA__
#ifdef UART_RX_PUEN
// Enable RX pin pullup
UART_PORT |= (1 << UART_RX_PIN);
#endif // UART_RX_PUEN
#endif // __AVR_XMEGA__
// Initialize UART EN pin
#ifdef __AVR_XMEGA__
#ifdef USE_UART_EN_PIN
UART_EN_PORT.DIRSET = (1 << UART_EN_PIN);
#if UART_EN_INV
UART_EN_PORT.OUTSET = (1 << UART_EN_PIN);
#else // UART_PIN_INV
UART_EN_PORT.OUTCLR = (1 << UART_EN_PIN);
#endif // UART_PIN_INV
#endif // USE_UART_EN_PIN
#else // __AVR_XMEGA__
#ifdef USE_UART_EN_PIN
UART_EN_PORT_DDR |= (1 << UART_EN_PIN);
#if UART_EN_INV
UART_EN_PORT |= (1 << UART_EN_PIN);
#else // UART_PIN_INV
UART_EN_PORT &= ~(1 << UART_EN_PIN);
#endif // UART_PIN_INV
#endif // USE_UART_EN_PIN
#endif // __AVR_XMEGA__
#endif // USE_UART
#ifdef USE_I2C
// Initialize I2C interface
i2c_init();
#ifdef __AVR_XMEGA__
#ifdef USE_I2C_ADDRESS_NEGOTIATION
I2C_AUTONEG_PORT.DIRCLR = (1 << I2C_AUTONEG_PIN);
I2C_AUTONEG_PORT.OUTCLR = (1 << I2C_AUTONEG_PIN);
#endif // USE_I2C_ADDRESS_NEGOTIATION
#else // __AVR_XMEGA__
#ifdef USE_I2C_ADDRESS_NEGOTIATION
I2C_AUTONEG_PORT_DDR &= ~(1 << I2C_AUTONEG_PIN);
I2C_AUTONEG_PORT &= ~(1 << I2C_AUTONEG_PIN);
#endif // USE_I2C_ADDRESS_NEGOTIATION
#endif // __AVR_XMEGA__
#endif // USE_I2C
#ifdef USE_FIFO
// Initialize FIFO
fifo_init();
#endif // USE_FIFO
#ifndef __AVR_XMEGA__
// ATMEGA must reset via watchdog, so turn it off
MCUSR = 0;
wdt_disable();
#endif
// --------------------------------------------------
// End initialization section
// One time trigger section
// Triggers that are checked once, regardless of
// whether or not USE_ENTER_DELAY is selected
// --------------------------------------------------
// --------------------------------------------------
// End one time trigger section
#ifdef USE_ENTER_DELAY
k = ENTER_BLINK_COUNT*2;
j = ENTER_BLINK_WAIT;
while (!in_bootloader && k > 0)
{
if (j-- <= 0)
{
#ifdef USE_LED
#ifdef __AVR_XMEGA__
LED_PORT.OUTTGL = (1 << LED_PIN);
#else // __AVR_XMEGA__
LED_PORT ^= (1 << LED_PIN);
#endif // __AVR_XMEGA__
#endif // USE_LED
j = ENTER_BLINK_WAIT;
k--;
}
#else // USE_ENTER_DELAY
// Need a small delay when not running loop
// so we don't accidentally enter the bootloader
// on power-up with USE_ENTER_PIN selected
asm("nop");
asm("nop");
asm("nop");
asm("nop");
#endif // USE_ENTER_DELAY
// Main trigger section
// Set in_bootloader here to enter the bootloader
// Checked when USE_ENTER_DELAY is selected
// --------------------------------------------------
#ifdef USE_ENTER_PIN
// Check entry pin state
#ifdef __AVR_XMEGA__
if ((ENTER_PORT.IN & (1 << ENTER_PIN)) == (ENTER_PIN_STATE ? (1 << ENTER_PIN) : 0))
in_bootloader = 1;
#else // __AVR_XMEGA__
if ((ENTER_PORT_PIN & (1 << ENTER_PIN)) == (ENTER_PIN_STATE ? (1 << ENTER_PIN) : 0))
in_bootloader = 1;
#endif // __AVR_XMEGA__
#endif // USE_ENTER_PIN
#ifdef USE_ENTER_UART
// Check for received character
#ifdef ENTER_UART_NEED_SYNC
if (uart_char_received() && (uart_cur_char() == CMD_SYNC))
#else // ENTER_UART_NEED_SYNC
if (uart_char_received())
#endif // ENTER_UART_NEED_SYNC
{
in_bootloader = 1;
comm_mode = MODE_UART;
}
#endif // USE_ENTER_UART
#ifdef USE_ENTER_I2C
// Check for address match condition
if (i2c_address_match())
{
in_bootloader = 1;
comm_mode = MODE_I2C;
}
#endif // USE_ENTER_I2C
#ifdef USE_ENTER_FIFO
// Check for received character
#ifdef ENTER_FIFO_NEED_SYNC
if (fifo_char_received() && (fifo_cur_char() == CMD_SYNC))
#else // ENTER_FIFO_NEED_SYNC
if (fifo_char_received())
#endif // ENTER_FIFO_NEED_SYNC
{
in_bootloader = 1;
comm_mode = MODE_FIFO;
}
#endif // USE_ENTER_FIFO
#ifdef USE_ENTER_EEPROM
if (enter_eeprom_check())
{
enter_eeprom_reset();
in_bootloader = 1;
}
#endif // USE_ENTER_EEPROM
// --------------------------------------------------
// End main trigger section
#ifdef __AVR_XMEGA__
WDT_Reset();
#else // __AVR_XMEGA__
wdt_reset();
#endif // __AVR_XMEGA__
#ifdef USE_ENTER_DELAY
}
#endif // USE_ENTER_DELAY
#ifdef USE_INTERRUPTS
// Enable interrupts
sei();
#endif // USE_INTERRUPTS
#ifdef USE_WATCHDOG
WDT_EnableAndSetTimeout();
#endif // USE_WATCHDOG
// Main bootloader
while (in_bootloader) {
#ifdef USE_LED
#ifdef __AVR_XMEGA__
LED_PORT.OUTTGL = (1 << LED_PIN);
#else // __AVR_XMEGA__
LED_PORT ^= (1 << LED_PIN);
#endif // __AVR_XMEGA__
#endif // USE_LED
val = get_char();
#ifdef USE_WATCHDOG
WDT_Reset();
#endif // USE_WATCHDOG
// Main bootloader parser
// check autoincrement status
if (val == CMD_CHECK_AUTOINCREMENT)
{
// yes, it is supported
send_char(REPLY_YES);
}
// Set address
else if (val == CMD_SET_ADDRESS)
{
// Read address high then low
address = get_2bytes();
// acknowledge
send_char(REPLY_ACK);
}
// Extended address
else if (val == CMD_SET_EXT_ADDRESS)
{
// Read address high then low
//address = ((ADDR_T)get_char() << 16) | get_2bytes();
asm volatile (
"call get_char" "\n\t"
"mov %C0,r24" "\n\t"
"call get_2bytes" "\n\t"
"clr %D0" "\n\t"
: "=r" (address)
:
);
// acknowledge
send_char(REPLY_ACK);
}
// Chip erase
else if (val == CMD_CHIP_ERASE)
{
// Erase the application section
Flash_EraseApplicationSection();
// Wait for completion
#ifdef __AVR_XMEGA__
#ifdef USE_WATCHDOG
while (NVM_STATUS & NVM_NVMBUSY_bp)
{
// reset watchdog while waiting for erase completion
WDT_Reset();
}
#else // USE_WATCHDOG
SP_WaitForSPM();
#endif // USE_WATCHDOG
#endif // __AVR_XMEGA__
// Erase EEPROM
EEPROM_erase_all();
// turn off read protection
#ifdef NEED_CODE_PROTECTION
protected = 0;
#endif // NEED_CODE_PROTECTION
// acknowledge
send_char(REPLY_ACK);
}
#ifdef ENABLE_BLOCK_SUPPORT
// Check block load support
else if (val == CMD_CHECK_BLOCK_SUPPORT )
{
// yes, it is supported
send_char(REPLY_YES);
// Send block size (page size)
send_char((SPM_PAGESIZE >> 8) & 0xFF);
send_char(SPM_PAGESIZE & 0xFF);
}
// Block load
else if (val == CMD_BLOCK_LOAD)
{
// Block size
i = get_2bytes();
// Memory type
val = get_char();
// Load it
send_char(BlockLoad(i, val, &address));
}
// Block read
else if (val == CMD_BLOCK_READ)
{
// Block size
i = get_2bytes();
// Memory type
val = get_char();
// Read it
BlockRead(i, val, &address);
}
#endif // ENABLE_BLOCK_SUPPORT
#ifdef ENABLE_FLASH_BYTE_SUPPORT
// Read program memory byte
else if (val == CMD_READ_BYTE)
{
unsigned int w = Flash_ReadWord((address << 1));
#ifdef ENABLE_CODE_PROTECTION
if (protected)
w = 0xffff;
#endif // ENABLE_CODE_PROTECTION
send_char(w >> 8);
send_char(w);
address++;
}
// Write program memory low byte
else if (val == CMD_WRITE_LOW_BYTE)
{
// get low byte
i = get_char();
send_char(REPLY_ACK);
}
// Write program memory high byte
else if (val == CMD_WRITE_HIGH_BYTE)
{
// get high byte; combine
i |= (get_char() << 8);
Flash_LoadFlashWord((address << 1), i);
address++;
send_char(REPLY_ACK);
}
// Write page
else if (val == CMD_WRITE_PAGE)
{
if (address >= (APP_SECTION_SIZE>>1))
{
// don't allow bootloader overwrite
send_char(REPLY_ERROR);
}
else
{
Flash_WriteApplicationPage( address << 1);
send_char(REPLY_ACK);
}
}
#endif // ENABLE_FLASH_BYTE_SUPPORT
#ifdef ENABLE_EEPROM_BYTE_SUPPORT
// Write EEPROM memory
else if (val == CMD_WRITE_EEPROM_BYTE)
{
EEPROM_write_byte(address, get_char());
address++;
send_char(REPLY_ACK);
}
// Read EEPROM memory
else if (val == CMD_READ_EEPROM_BYTE)
{
char c = EEPROM_read_byte(address);
#ifdef ENABLE_EEPROM_PROTECTION
if (protected)
c = 0xff;
#endif // ENABLE_EEPROM_PROTECTION
send_char(c);
address++;
}
#endif // ENABLE_EEPROM_BYTE_SUPPORT
#ifdef ENABLE_LOCK_BITS
#ifdef __AVR_XMEGA__
// Write lockbits
else if (val == CMD_WRITE_LOCK_BITS)
{
SP_WriteLockBits( get_char() );
send_char(REPLY_ACK);
}
// Read lockbits
else if (val == CMD_READ_LOCK_BITS)
{
send_char(SP_ReadLockBits());
}
#endif // __AVR_XMEGA__
#endif // ENABLE_LOCK_BITS
#ifdef ENABLE_FUSE_BITS
#ifdef __AVR_XMEGA__
// Read low fuse bits
else if (val == CMD_READ_LOW_FUSE_BITS)
{
send_char(SP_ReadFuseByte(0));
}
// Read high fuse bits
else if (val == CMD_READ_HIGH_FUSE_BITS)
{
send_char(SP_ReadFuseByte(1));
}
// Read extended fuse bits
else if (val == CMD_READ_EXT_FUSE_BITS)
{
send_char(SP_ReadFuseByte(2));
}
#endif // __AVR_XMEGA__
#endif // ENABLE_FUSE_BITS
// Enter and leave programming mode
else if ((val == CMD_ENTER_PROG_MODE) || (val == CMD_LEAVE_PROG_MODE))
{
// just acknowledge
send_char(REPLY_ACK);
}
// Exit bootloader
else if (val == CMD_EXIT_BOOTLOADER)
{
in_bootloader = 0;
send_char(REPLY_ACK);
}
// Get programmer type
else if (val == CMD_PROGRAMMER_TYPE)
{
// serial
send_char('S');
}
// Return supported device codes
else if (val == CMD_DEVICE_CODE)
{
// send only this device
send_char(123); // TODO
// terminator
send_char(0);
}
// Set LED, clear LED, and set device type
else if ((val == CMD_SET_LED) || (val == CMD_CLEAR_LED) || (val == CMD_SET_TYPE))
{
// discard parameter
get_char();
send_char(REPLY_ACK);
}
// Return program identifier
else if (val == CMD_PROGRAM_ID)
{
send_char('X');
send_char('B');
send_char('o');
send_char('o');
send_char('t');
send_char('+');
send_char('+');
}
// Read software version
else if (val == CMD_VERSION)
{
send_char('0' + XBOOT_VERSION_MAJOR);
send_char('0' + XBOOT_VERSION_MINOR);
}
// Read signature bytes
else if (val == CMD_READ_SIGNATURE)
{
send_char(SIGNATURE_2);
send_char(SIGNATURE_1);
send_char(SIGNATURE_0);
}
#ifdef ENABLE_CRC_SUPPORT
else if (val == CMD_CRC)
{
uint32_t start = 0;
uint32_t length = 0;
uint16_t crc;
val = get_char();
switch (val)
{
case SECTION_FLASH:
length = PROGMEM_SIZE;
break;
case SECTION_APPLICATION:
length = APP_SECTION_SIZE;
break;
case SECTION_BOOT:
start = BOOT_SECTION_START;
length = BOOT_SECTION_SIZE;
break;
#ifdef ENABLE_API
case SECTION_APP:
length = XB_APP_SIZE;
break;
case SECTION_APP_TEMP:
start = XB_APP_TEMP_START;
length = XB_APP_TEMP_SIZE;
break;
#endif // ENABLE_API
default:
send_char(REPLY_ERROR);
continue;
}
crc = crc16_block(start, length);
send_char((crc >> 8) & 0xff);
send_char(crc & 0xff);
}
#endif // ENABLE_CRC_SUPPORT
#ifdef USE_I2C
#ifdef USE_I2C_ADDRESS_NEGOTIATION
// Enter autonegotiate mode
else if (val == CMD_AUTONEG_START)
{
// The address autonegotiation protocol is borrowed from the
// OneWire address detection method. The algorthim Utilizes
// one extra shared wire, pulled up by resistors just like the
// main I2C bus, a OneWire bus, or a wired-AND IRQ line.
// The protocol involves intelligently guessing all of the
// connected devices' 88 bit unique hardware ID numbers, stored
// permanently in the production signature row during manufacture
// (see XMega series datasheet for details)
#ifdef __AVR_XMEGA__
// k is temp
// devid is pointer to current bit, init to first bit
// of the hardware ID in the production signature row
devid_bit = 0x08 << 3;
// read first byte of hardware ID into temporary location
k = SP_ReadCalibrationByte(0x08);
// main negotiation loop
while (1)
{
// wait for incoming data
while (1)
{
// check for bit read command
if (!(I2C_AUTONEG_PORT.IN & (1 << I2C_AUTONEG_PIN)))
{
// write current bit of hardware ID
ow_slave_write_bit(k & 1); // write bit
break;
}
// check for I2C bus activity
else if (I2C_DEVICE.SLAVE.STATUS & (TWI_SLAVE_APIF_bm | TWI_SLAVE_DIF_bm))
{
// grab a byte
// (there will be no I2C bus activity while
// the autonegotiation is taking place,
// so it's OK to block)
val = get_char();
// Is this an address byte for me?
if (val == CMD_AUTONEG_DONE)
{
// If so, we're now attached, so light
// the LED and update the I2C bus
// controller accordingly
// turn on attach LED
#ifdef USE_ATTACH_LED
#if ATTACH_LED_INV
ATTACH_LED_PORT.OUTCLR = (1 << ATTACH_LED_PIN);
#else
ATTACH_LED_PORT.OUTSET = (1 << ATTACH_LED_PIN);
#endif // ATTACH_LED_INV
#endif // USE_ATTACH_LED
// get new address
#if I2C_AUTONEG_DIS_GC
I2C_DEVICE.SLAVE.ADDR = get_char() << 1;
#else
I2C_DEVICE.SLAVE.ADDR = (get_char() << 1) | 1;
#endif // I2C_AUTONEG_DIS_GC
#if I2C_AUTONEG_DIS_PROMISC
// turn off promiscuous mode
I2C_DEVICE.SLAVE.CTRLA = TWI_SLAVE_ENABLE_bm;
#endif // I2C_AUTONEG_DIS_PROMISC
// we're done here
goto autoneg_done;
}
// Check for sync command
else if (val == CMD_SYNC)
{
// break out to main bootloader on sync
goto autoneg_done;
}
}
}
// Already wrote normal bit, so write the inverted one
ow_slave_write_bit(~k & 1); // write inverted bit
// Now read master's guess
i = ow_slave_read_bit();
// Does the guess agree with the current bit?
if ((k & 1 && i) || (~k & 1 && !i))
{
// look at next bit
devid_bit++;
k >>= 1;
// time for next byte?
if (!(devid_bit & 7))
{
// Out of bits?
if (devid_bit > (0x15 << 3))
{
// Can't break here (need to wait
// to see if the master sends along
// an address) so wrap around instead
devid_bit = 0x08 << 3;
}
// there are some holes in the signature row,
// so skip over them
if (devid_bit == (0x0E << 3))
devid_bit += 0x02 << 3;
if (devid_bit == (0x11 << 3))
devid_bit += 0x01 << 3;
// Read next byte
k = SP_ReadCalibrationByte(devid_bit >> 3);
}
}
else
{
// No match, we're done here
break;
}
}
autoneg_done:
// dummy to avoid error message
// this actually produces code 4 bytes smaller than either
// an asm nop, a continue, or a bare semicolon
i = 0;
#endif // __AVR_XMEGA__
}
// out-of-order autonegotiate address message
else if (val == CMD_AUTONEG_DONE)
{
// ignore it
// (blocking to send a ? will cause trouble)
}
#endif // USE_I2C_ADDRESS_NEGOTIATION
#endif // USE_I2C
// ESC (0x1b) to sync
// otherwise, error
else if (val != CMD_SYNC)
{
send_char(REPLY_ERROR);
}
// Wait for any lingering SPM instructions to finish
Flash_WaitForSPM();
// End of bootloader main loop
}
#ifdef NEED_INTERRUPTS
// Disable interrupts
cli();
#endif // NEED_INTERRUPTS
// Bootloader exit section
// Code here runs after the bootloader has exited,
// but before the application code has started
// --------------------------------------------------
#ifdef ENABLE_API
#ifdef ENABLE_API_FIRMWARE_UPDATE
// Update firmware if needed
install_firmware();
#endif // ENABLE_API_FIRMWARE_UPDATE
#endif // ENABLE_API
#ifdef USE_FIFO
// Shut down FIFO
fifo_deinit();
#endif // USE_FIFO
#ifdef USE_I2C
// Shut down I2C interface
i2c_deinit();
#endif // USE_I2C
#ifdef USE_UART
// Shut down UART
uart_deinit();
// Disable RX pin pull-up
#ifdef __AVR_XMEGA__
#ifdef UART_RX_PUEN
// Disable RX pin pullup
UART_RX_PIN_CTRL = 0;
#endif // UART_RX_PUEN
#else // __AVR_XMEGA__
#ifdef UART_RX_PUEN
// Disable RX pin pullup
UART_PORT &= ~(1 << UART_RX_PIN);
#endif // UART_RX_PUEN
#endif // __AVR_XMEGA__
// Shut down UART EN pin
#ifdef USE_UART_EN_PIN
#ifdef __AVR_XMEGA__
UART_EN_PORT.DIRCLR = (1 << UART_EN_PIN);
UART_EN_PORT.OUTCLR = (1 << UART_EN_PIN);
#else // __AVR_XMEGA__
UART_EN_PORT_DDR &= ~(1 << UART_EN_PIN);
UART_EN_PORT &= ~(1 << UART_EN_PIN);
#endif // __AVR_XMEGA__
#endif // USE_UART_EN_PIN
#endif // USE_UART
#ifdef __AVR_XMEGA__
#ifdef LOCK_SPM_ON_EXIT
// Lock SPM writes
SP_LockSPM();
#endif // LOCK_SPM_ON_EXIT
#endif // __AVR_XMEGA__
// Disable bootloader entry pin
#ifdef __AVR_XMEGA__
#ifdef USE_ENTER_PIN
#if ENTER_PIN_PUEN
// Disable bootloader entry pin pullup
ENTER_PIN_CTRL = 0;
#endif // ENTER_PIN_PUEN
#endif // USE_ENTER_PIN
#else // __AVR_XMEGA__
#ifdef USE_ENTER_PIN
#if ENTER_PIN_PUEN
// Disable bootloader entry pin pullup
ENTER_PORT &= ~(1 << ENTER_PIN);
#endif // ENTER_PIN_PUEN
#endif // USE_ENTER_PIN
#endif // __AVR_XMEGA__
// LED
#ifdef __AVR_XMEGA__
#ifdef USE_LED
// Turn off LED on exit
LED_PORT.DIRCLR = (1 << LED_PIN);
LED_PORT.OUTCLR = (1 << LED_PIN);
#endif // USE_LED
#else // __AVR_XMEGA__
#ifdef USE_LED
// Turn off LED on exit
LED_PORT_DDR &= ~(1 << LED_PIN);
LED_PORT &= ~(1 << LED_PIN);
#endif // USE_LED
#endif //__AVR_XMEGA__
// Attach LED
#ifdef __AVR_XMEGA__
#ifdef USE_I2C_ADDRESS_NEGOTIATION
#ifdef USE_ATTACH_LED
// Disable ATTACH_LED
ATTACH_LED_PORT.DIRCLR = (1 << ATTACH_LED_PIN);
ATTACH_LED_PORT.OUTCLR = (1 << ATTACH_LED_PIN);
#endif // USE_ATTACH_LED
#endif // USE_I2C_ADDRESS_NEGOTIATION
#else // __AVR_XMEGA__
#ifdef USE_I2C_ADDRESS_NEGOTIATION
#ifdef USE_ATTACH_LED
// Disable ATTACH_LED
ATTACH_LED_PORT_DDR &= ~(1 << ATTACH_LED_PIN);