Version 0.5 (20040407)
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118
main.c
118
main.c
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/*****************************************************************************
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*
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* AVRPROG compatible boot-loader
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* Version : 0.4 (6. Apr. 2004)
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* Version : 0.5 (7. Apr. 2004)
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* Compiler : avr-gcc 3.3.1 / avr-libc 1.0
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* size : ( larger than 512 words :-( )
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* size : depends on features and startup ( minmal features < 512 words)
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* by : Martin Thomas, Kaiserslautern, Germany
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* eversmith@heizung-thomas.de
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*
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@ -41,10 +41,12 @@
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* options for the newly created section. See the avr-libc FAQ, the avr-
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* libc's avr/boot.h documentation and the makefile for further details.
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*
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* Sorry, so far efforts to shrink to 512 words failed.
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* See the makefile for information how to adopt the linker-settings to
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* the selected Boot Size (_Bxxx below)
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*
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* With BOOT_SIMPLE this bootloader has 0x3DE bytes size and should fit
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* into a 512word bootloader-section.
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*
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****************************************************************************/
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/*
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Does not work so far:
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*/
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// programmers-notepad tabsize 4
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#define VERSION_HIGH '0'
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#define VERSION_LOW '5'
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#include <inttypes.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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/* BOOTICE-Mode - to flash the JTAGICE upgrade.ebn file.
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No startup-sequence in this mode. Jump directly to the
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parser-loop on reset
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XTAL in BOOTICEMODE must be 7372800 Hz to be compatible
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with the org. JTAGICE-Firmware */
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// #define BOOTICEMODE
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/* Port and Pin in this port that has to grounded
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(active low) to start the bootloader */
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#define BLPORT PORTC
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#define BLPIN PINC
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#define BLPNUM PINC0
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// UART handling - some definitions from P. Fleury's Library - thanks
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#define BAUDRATE 19200
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/*
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Select startup-mode
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* SIMPLE-Mode - Jump to bootloader main BL-loop if key is
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pressed (Pin grounded) "during" reset or jump to the
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application if the pin is not grounded (=pulled up by
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internal pull-up-resistor)
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* POWERSAVE-Mode - Startup is separated in two loops
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which makes power-saving a little easier if no firmware
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is on the chip. Needs more memory
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* BOOTICE-Mode - to flash the JTAGICE upgrade.ebn file.
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No startup-sequence in this mode. Jump directly to the
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parser-loop on reset
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XTAL in BOOTICEMODE must be 7372800 Hz to be compatible
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with the org. JTAGICE-Firmware */
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#define START_SIMPLE
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//#define START_POWERSAVE
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//#define START_BOOTICE
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#ifndef BOOTICEMODE
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#ifndef START_BOOTICE
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#define XTAL 3686400
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#else
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#warning "BOOTICE mode - External Crystal/Oszillator must be 7,3728 MHz"
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#define XTAL 7372800
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#endif
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// UART handling - some definitions from P. Fleury's Library - thanks
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#define BAUDRATE 19200
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#include "uart.h"
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/* enable/disable readout of fuse and lock-bits
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(will not work for Mega169 since not supported by AVRPROG 1.37 */
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#define ENABLEREADFUSELOCK
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// #define ENABLEREADFUSELOCK
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/* enable/disable write of lock-bits
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WARNING: lock-bits can not be reseted by bootloader (as far as I know)
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*/
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// #define WRITELOCKBITS
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/* Select Boot Size (select one, comment out the others)
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select at least _B1024 */
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/* Select Boot Size (select one, comment out the others) */
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// NO! #define _B128
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// NO! #define _B256
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// NO! #define _B512
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// MAYBE: #define _B512
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#define _B1024
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//#define _B2048
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@ -131,13 +150,16 @@ void send_boot(void)
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sendchar('T');
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}
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void (*jump_to_app)(void) = 0x0000;
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int main(void)
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{
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void (*funcptr)( void ) = 0x0000; // Set up function pointer
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unsigned short tempi;
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unsigned short tempi;
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char val;
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char OK = 1;
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#ifdef START_POWERSAVE
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char OK = 1;
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#endif
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MCUCR = (1<<IVCE);
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MCUCR = (1<<IVSEL); //move interruptvectors to the Boot sector
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@ -145,26 +167,24 @@ int main(void)
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USART_Init(UART_BAUD_SELECT(BAUDRATE,XTAL),UARTSINGLE); // single speed
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// USART_Init(UART_BAUD_SELECT(BAUDRATE/2,XTAL),UARTDOUBLE); // double speed
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#if defined(START_POWERSAVE)
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/*
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This is an adoption of the Butterfly Bootloader startup-sequence.
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It may look a little strange but separating the login-loop from
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the main parser-loop gives a lot a possibilities (timeout, sleep-modes
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etc.).
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*/
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#ifndef BOOTICEMODE
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PORTA = 0xFF; // Enable pullups on Port A
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BLPORT = 0xFF; // Enable pullups on Port C
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for(;OK;)
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{
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if((PINA & (1<<PINA7)))
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if((BLPIN & (1<<BLPNUM)))
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{
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// jump to main app if PIN A7 is not grounded
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PORTA = 0x00; // set to default
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// jump to main app if PIN C0 is not grounded
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BLPORT = 0x00; // set to default
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MCUCR = (1<<IVCE);
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MCUCR = (0<<IVSEL); //move interruptvectors to the Application sector
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funcptr(); // Jump to application sector
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jump_to_app(); // Jump to application sector
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}
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else
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{
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@ -182,14 +202,29 @@ int main(void)
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else
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sendchar('?');
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}
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// Power-Save code here
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}
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#else
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#elif defined(START_SIMPLE)
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BLPORT = 0xFF; // Enable pullups on Port C
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if((BLPIN & (1<<BLPNUM)))
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{
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// jump to main app if PIN C0 is not grounded
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BLPORT = 0x00; // set to default
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MCUCR = (1<<IVCE);
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MCUCR = (0<<IVSEL); //move interruptvectors to the Application sector
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jump_to_app(); // Jump to application sector
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}
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#elif defined(START_BOOTICE)
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#warning "BOOTICE mode - no startup-condition"
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#else
|
||||
#error "Select START_ condition for bootloader in main.c"
|
||||
#endif
|
||||
|
||||
for(;;)
|
||||
{
|
||||
val=recchar();
|
||||
val=recchar();
|
||||
|
||||
if(val=='a') //Autoincrement?
|
||||
{
|
||||
@ -380,7 +415,7 @@ int main(void)
|
||||
#endif
|
||||
// end of ENABLEREADFUSELOCK section
|
||||
|
||||
else if(val=='t') // Return programmer type
|
||||
else if(val=='t') // Return device type
|
||||
{
|
||||
sendchar(devtype);
|
||||
sendchar(0);
|
||||
@ -405,8 +440,8 @@ int main(void)
|
||||
|
||||
else if (val=='V') // Return Software Version
|
||||
{
|
||||
sendchar('0');
|
||||
sendchar('4');
|
||||
sendchar(VERSION_HIGH);
|
||||
sendchar(VERSION_LOW);
|
||||
}
|
||||
|
||||
else if (val=='s') // Return Signature Byte
|
||||
@ -462,7 +497,10 @@ unsigned char BufferLoad(unsigned int size, unsigned char mem)
|
||||
|
||||
} while(size); // Loop until all bytes written
|
||||
|
||||
/* commented out since not compatible with mega8 -
|
||||
secondary benefit: saves memory
|
||||
tempaddress &= 0xFF80; // Ensure the address points to the first byte in the page
|
||||
*/
|
||||
|
||||
//write_page((tempaddress),0x05); // Program page contents
|
||||
boot_page_write(tempaddress);
|
||||
@ -470,15 +508,19 @@ unsigned char BufferLoad(unsigned int size, unsigned char mem)
|
||||
// write_page(tempaddress,(1<<RWWSRE) + (1<<SPMEN));
|
||||
boot_rww_enable(); //Re-enable the RWW section
|
||||
|
||||
/* commented out since not compatible with mega8
|
||||
if (address != (address & 0xFF80))
|
||||
{ // Ensure that the address points to the beginning of the next page
|
||||
address &= 0xFF80;
|
||||
address += SPM_PAGESIZE;
|
||||
}
|
||||
*/
|
||||
|
||||
} // End FLASH
|
||||
|
||||
if (mem == 'E') // Start EEPROM
|
||||
{
|
||||
address>>=1;
|
||||
do {
|
||||
EEARL = address; // Setup EEPROM address
|
||||
EEARH = (address >> 8);
|
||||
@ -508,16 +550,20 @@ unsigned char BufferLoad(unsigned int size, unsigned char mem)
|
||||
void BlockRead(unsigned int size, unsigned char mem)
|
||||
{
|
||||
unsigned int data;
|
||||
|
||||
// Disable interrupts if needed
|
||||
/*
|
||||
unsigned char sreg;
|
||||
|
||||
// Disable interrupts.
|
||||
sreg = SREG;
|
||||
sreg = SREG;
|
||||
cli();
|
||||
*/
|
||||
|
||||
my_eeprom_busy_wait();
|
||||
|
||||
if (mem == 'E') // Read EEPROM
|
||||
{
|
||||
// address>>=1; // not needed here - hmm, somehow inconsistant TODO
|
||||
do {
|
||||
EEARL = address; // Setup EEPROM address
|
||||
EEARH = (address >> 8);
|
||||
@ -538,6 +584,6 @@ void BlockRead(unsigned int size, unsigned char mem)
|
||||
} while (size); // Repeat until all block has been read
|
||||
}
|
||||
// Re-enable interrupts (if they were ever enabled).
|
||||
SREG=sreg;
|
||||
/*SREG=sreg;*/
|
||||
}
|
||||
|
||||
|
||||
23
makefile
23
makefile
@ -31,7 +31,21 @@
|
||||
|
||||
|
||||
# MCU name
|
||||
MCU = atmega16
|
||||
## MCU = atmega16
|
||||
MCU = atmega8
|
||||
|
||||
################## BOOTLOADER ######################
|
||||
# mt: Boot loader support. So far not done with a separate section
|
||||
# to get the interrupt vector into the bootloader area.
|
||||
# Bootloader address in datasheet and stk500 is given as
|
||||
# "word", gcc toolchain needs "byte"-address
|
||||
# (see LDFLAGS further down)
|
||||
|
||||
# 0x1C00*2=0x3800 for ATmega16 1024 words Boot Size
|
||||
## MT_BOOTLOADER_ADDRESS = 3800
|
||||
# 0x0C00*2=0x1800 for ATmega8 1024 words Boot Size
|
||||
MT_BOOTLOADER_ADDRESS = 1800
|
||||
|
||||
|
||||
# Output format. (can be srec, ihex, binary)
|
||||
FORMAT = ihex
|
||||
@ -123,11 +137,8 @@ LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
|
||||
LDFLAGS += -lm
|
||||
|
||||
################## BOOTLOADER ######################
|
||||
# mt: Boot loader support. So far not done with a separate section
|
||||
# to get the interrupt vector into the bootloader area.
|
||||
# bootloader address in datasheet and stk500 is given as
|
||||
# "word", gcc toolchain needs "byte"-address (here: 0x1C00*2)
|
||||
MT_BOOTLOADER_ADDRESS = 3800
|
||||
# MT_BOOTLOADER_ADDRESS (=Start of Boot Loader section
|
||||
# in bytes - not words) is defined above.
|
||||
LDFLAGS += -Wl,--section-start=.text=$(MT_BOOTLOADER_ADDRESS)
|
||||
|
||||
# Programming support using avrdude. Settings and variables.
|
||||
|
||||
14
readme.txt
14
readme.txt
@ -15,6 +15,18 @@
|
||||
|
||||
======================================================
|
||||
|
||||
7. Apr. 2004 - Version 0.5
|
||||
|
||||
* added different startup-methods
|
||||
* compatible with ATmega8 now
|
||||
* included makefile adopted to ATmega8 now
|
||||
(ATmega16 options still available)
|
||||
* fixed jump to application which did not work
|
||||
reliably before
|
||||
* tested with ATmega8
|
||||
* minimal options and startup-code result in
|
||||
bootloader-size < 512 words
|
||||
|
||||
6. Apr. 2004 - Version 0.4
|
||||
|
||||
* Buffered read of chars from UART during programming
|
||||
@ -29,7 +41,7 @@ out during the development of the STK-500-compatible
|
||||
bootloader. But setting lock-bits still does not
|
||||
work with this bootloader.
|
||||
* read of the low-fuse byte works (high byte still TODO)
|
||||
* read of the lock-byte works (wirte still TODO)
|
||||
* read of the lock-byte works (write still TODO)
|
||||
|
||||
27. Mar 2004 - Version 0.3
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user