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|
/* Name: main.c
* Project: Micronucleus
* Author: Jenna Fox
* Creation Date: 2007-12-08
* Tabsize: 4
* Copyright: (c) 2012 Jenna Fox
* Portions Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH (USBaspLoader)
* Portions Copyright: (c) 2012 Louis Beaudoin (USBaspLoader-tiny85)
* License: GNU GPL v2 (see License.txt)
*/
#define MICRONUCLEUS_VERSION_MAJOR 1
#define MICRONUCLEUS_VERSION_MINOR 3
// how many milliseconds should host wait till it sends another erase or write?
// needs to be above 4.5 (and a whole integer) as avr freezes for 4.5ms
#define MICRONUCLEUS_WRITE_SLEEP 6
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <avr/wdt.h>
#include <avr/boot.h>
//#include <avr/eeprom.h>
#include <util/delay.h>
//#include <string.h>
static void leaveBootloader() __attribute__((__noreturn__));
#include "bootloaderconfig.h"
#include "usbdrv/usbdrv.c"
/* ------------------------------------------------------------------------ */
#ifndef ulong
# define ulong unsigned long
#endif
#ifndef uint
# define uint unsigned int
#endif
#ifndef BOOTLOADER_CAN_EXIT
# define BOOTLOADER_CAN_EXIT 0
#endif
/* allow compatibility with avrusbboot's bootloaderconfig.h: */
#ifdef BOOTLOADER_INIT
# define bootLoaderInit() BOOTLOADER_INIT
# define bootLoaderExit()
#endif
#ifdef BOOTLOADER_CONDITION
# define bootLoaderCondition() BOOTLOADER_CONDITION
#endif
/* device compatibility: */
#ifndef GICR /* ATMega*8 don't have GICR, use MCUCR instead */
# define GICR MCUCR
#endif
/* ------------------------------------------------------------------------ */
#define addr_t uint
// typedef union longConverter{
// addr_t l;
// uint w[sizeof(addr_t)/2];
// uchar b[sizeof(addr_t)];
// } longConverter_t;
//////// Stuff Bluebie Added
// postscript are the few bytes at the end of programmable memory which store tinyVectors
// and used to in USBaspLoader-tiny85 store the checksum iirc
#define POSTSCRIPT_SIZE 4
#define PROGMEM_SIZE (BOOTLOADER_ADDRESS - POSTSCRIPT_SIZE) /* max size of user program */
// verify the bootloader address aligns with page size
#if BOOTLOADER_ADDRESS % SPM_PAGESIZE != 0
# error "BOOTLOADER_ADDRESS in makefile must be a multiple of chip's pagesize"
#endif
#ifdef AUTO_EXIT_MS
# if AUTO_EXIT_MS < (MICRONUCLEUS_WRITE_SLEEP * (BOOTLOADER_ADDRESS / SPM_PAGESIZE))
# warning "AUTO_EXIT_MS is shorter than the time it takes to perform erase function - might affect reliability?"
# warning "Try increasing AUTO_EXIT_MS if you have stability problems"
# endif
#endif
// events system schedules functions to run in the main loop
static uchar events = 0; // bitmap of events to run
#define EVENT_ERASE_APPLICATION 1
#define EVENT_WRITE_PAGE 2
#define EVENT_EXECUTE 4
// controls state of events
#define fireEvent(event) events |= (event)
#define isEvent(event) (events & (event))
#define clearEvents() events = 0
// length of bytes to write in to flash memory in upcomming usbFunctionWrite calls
//static unsigned char writeLength;
// becomes 1 when some programming happened
// lets leaveBootloader know if needs to finish up the programming
static uchar didWriteSomething = 0;
uint16_t idlePolls = 0; // how long have we been idle?
static uint16_t vectorTemp[2]; // remember data to create tinyVector table before BOOTLOADER_ADDRESS
static addr_t currentAddress; // current progmem address, used for erasing and writing
/* ------------------------------------------------------------------------ */
static inline void eraseApplication(void);
static void writeFlashPage(void);
static void writeWordToPageBuffer(uint16_t data);
static void fillFlashWithVectors(void);
static uchar usbFunctionSetup(uchar data[8]);
static uchar usbFunctionWrite(uchar *data, uchar length);
static inline void initForUsbConnectivity(void);
static inline void tiny85FlashInit(void);
static inline void tiny85FlashWrites(void);
//static inline void tiny85FinishWriting(void);
static inline void leaveBootloader(void);
// erase any existing application and write in jumps for usb interrupt and reset to bootloader
// - Because flash can be erased once and programmed several times, we can write the bootloader
// - vectors in now, and write in the application stuff around them later.
// - if vectors weren't written back in immidately, usb would fail.
static inline void eraseApplication(void) {
// erase all pages until bootloader, in reverse order (so our vectors stay in place for as long as possible)
// while the vectors don't matter for usb comms as interrupts are disabled during erase, it's important
// to minimise the chance of leaving the device in a state where the bootloader wont run, if there's power failure
// during upload
currentAddress = BOOTLOADER_ADDRESS;
cli();
while (currentAddress) {
currentAddress -= SPM_PAGESIZE;
boot_page_erase(currentAddress);
boot_spm_busy_wait();
}
fillFlashWithVectors();
sei();
}
// simply write currently stored page in to already erased flash memory
static void writeFlashPage(void) {
didWriteSomething = 1;
cli();
boot_page_write(currentAddress - 2);
boot_spm_busy_wait(); // Wait until the memory is written.
sei();
}
// clear memory which stores data to be written by next writeFlashPage call
#define __boot_page_fill_clear() \
(__extension__({ \
__asm__ __volatile__ \
( \
"sts %0, %1\n\t" \
"spm\n\t" \
: \
: "i" (_SFR_MEM_ADDR(__SPM_REG)), \
"r" ((uint8_t)(__BOOT_PAGE_FILL | (1 << CTPB))) \
); \
}))
// write a word in to the page buffer, doing interrupt table modifications where they're required
static void writeWordToPageBuffer(uint16_t data) {
// first two interrupt vectors get replaced with a jump to the bootloader's vector table
if (currentAddress == (RESET_VECTOR_OFFSET * 2) || currentAddress == (USBPLUS_VECTOR_OFFSET * 2)) {
data = 0xC000 + (BOOTLOADER_ADDRESS/2) - 1;
}
// at end of page just before bootloader, write in tinyVector table
// see http://embedded-creations.com/projects/attiny85-usb-bootloader-overview/avr-jtag-programmer/
// for info on how the tiny vector table works
if (currentAddress == BOOTLOADER_ADDRESS - TINYVECTOR_RESET_OFFSET) {
data = vectorTemp[0] + ((FLASHEND + 1) - BOOTLOADER_ADDRESS)/2 + 2 + RESET_VECTOR_OFFSET;
}
if (currentAddress == BOOTLOADER_ADDRESS - TINYVECTOR_USBPLUS_OFFSET) {
data = vectorTemp[1] + ((FLASHEND + 1) - BOOTLOADER_ADDRESS)/2 + 1 + USBPLUS_VECTOR_OFFSET;
}
// clear page buffer as a precaution before filling the buffer on the first page
// in case the bootloader somehow ran after user program and there was something
// in the page buffer already
if (currentAddress == 0x0000) __boot_page_fill_clear();
cli();
boot_page_fill(currentAddress, data);
sei();
// only need to erase if there is data already in the page that doesn't match what we're programming
// TODO: what about this: if (pgm_read_word(currentAddress) & data != data) { ??? should work right?
//if (pgm_read_word(currentAddress) != data && pgm_read_word(currentAddress) != 0xFFFF) {
//if ((pgm_read_word(currentAddress) & data) != data) {
// fireEvent(EVENT_PAGE_NEEDS_ERASE);
//}
// increment progmem address by one word
currentAddress += 2;
}
// fills the rest of this page with vectors - interrupt vector or tinyvector tables where needed
static void fillFlashWithVectors(void) {
//int16_t i;
//
// fill all or remainder of page with 0xFFFF (as if unprogrammed)
//for (i = currentAddress % SPM_PAGESIZE; i < SPM_PAGESIZE; i += 2) {
// writeWordToPageBuffer(0xFFFF); // is where vector tables are sorted out
//}
// TODO: Or more simply:
do {
writeWordToPageBuffer(0xFFFF);
} while (currentAddress % SPM_PAGESIZE);
writeFlashPage();
}
/* ------------------------------------------------------------------------ */
static uchar usbFunctionSetup(uchar data[8]) {
usbRequest_t *rq = (void *)data;
idlePolls = 0; // reset idle polls when we get usb traffic
static uchar replyBuffer[4] = {
(((uint)PROGMEM_SIZE) >> 8) & 0xff,
((uint)PROGMEM_SIZE) & 0xff,
SPM_PAGESIZE,
MICRONUCLEUS_WRITE_SLEEP
};
if (rq->bRequest == 0) { // get device info
usbMsgPtr = replyBuffer;
return 4;
} else if (rq->bRequest == 1) { // write page
//writeLength = rq->wValue.word;
currentAddress = rq->wIndex.word;
return USB_NO_MSG; // hands off work to usbFunctionWrite
} else if (rq->bRequest == 2) { // erase application
fireEvent(EVENT_ERASE_APPLICATION);
} else { // exit bootloader
# if BOOTLOADER_CAN_EXIT
fireEvent(EVENT_EXECUTE);
# endif
}
return 0;
}
// read in a page over usb, and write it in to the flash write buffer
static uchar usbFunctionWrite(uchar *data, uchar length) {
//if (length > writeLength) length = writeLength; // test for missing final page bug
//writeLength -= length;
do {
// remember vectors or the tinyvector table
if (currentAddress == RESET_VECTOR_OFFSET * 2) {
vectorTemp[0] = *(short *)data;
}
if (currentAddress == USBPLUS_VECTOR_OFFSET * 2) {
vectorTemp[1] = *(short *)data;
}
// make sure we don't write over the bootloader!
if (currentAddress >= BOOTLOADER_ADDRESS) {
//__boot_page_fill_clear();
break;
}
writeWordToPageBuffer(*(uint16_t *) data);
data += 2; // advance data pointer
length -= 2;
} while(length);
// if we have now reached another page boundary, we're done
//uchar isLast = (writeLength == 0);
uchar isLast = ((currentAddress % SPM_PAGESIZE) == 0);
// definitely need this if! seems usbFunctionWrite gets called again in future usbPoll's in the runloop!
if (isLast) fireEvent(EVENT_WRITE_PAGE); // ask runloop to write our page
return isLast; // let vusb know we're done with this request
}
/* ------------------------------------------------------------------------ */
void PushMagicWord (void) __attribute__ ((naked)) __attribute__ ((section (".init3")));
// put the word "B007" at the bottom of the stack (RAMEND - RAMEND-1)
void PushMagicWord (void) {
asm volatile("ldi r16, 0xB0"::);
asm volatile("push r16"::);
asm volatile("ldi r16, 0x07"::);
asm volatile("push r16"::);
}
/* ------------------------------------------------------------------------ */
static inline void initForUsbConnectivity(void) {
usbInit();
/* enforce USB re-enumerate: */
usbDeviceDisconnect(); /* do this while interrupts are disabled */
_delay_ms(500);
usbDeviceConnect();
sei();
}
static inline void tiny85FlashInit(void) {
// check for erased first page (no bootloader interrupt vectors), add vectors if missing
// this needs to happen for usb communication to work later - essential to first run after bootloader
// being installed
if(pgm_read_word(RESET_VECTOR_OFFSET * 2) != 0xC000 + (BOOTLOADER_ADDRESS/2) - 1 ||
pgm_read_word(USBPLUS_VECTOR_OFFSET * 2) != 0xC000 + (BOOTLOADER_ADDRESS/2) - 1) {
fillFlashWithVectors();
}
// TODO: necessary to reset currentAddress?
currentAddress = 0;
}
static inline void tiny85FlashWrites(void) {
_delay_us(2000); // TODO: why is this here? - it just adds pointless two level deep loops seems like?
// write page to flash, interrupts will be disabled for > 4.5ms including erase
// TODO: Do we need this? Wouldn't the programmer always send full sized pages?
if (currentAddress % SPM_PAGESIZE) { // when we aren't perfectly aligned to a flash page boundary
fillFlashWithVectors(); // fill up the rest of the page with 0xFFFF (unprogrammed) bits
} else {
writeFlashPage(); // otherwise just write it
}
}
// finishes up writing to the flash, including adding the tinyVector tables at the end of memory
// TODO: can this be simplified? EG: currentAddress = PROGMEM_SIZE; fillFlashWithVectors();
// static inline void tiny85FinishWriting(void) {
// // make sure remainder of flash is erased and write checksum and application reset vectors
// if (didWriteSomething) {
// while (currentAddress < BOOTLOADER_ADDRESS) {
// fillFlashWithVectors();
// }
// }
// }
// reset system to a normal state and launch user program
static inline void leaveBootloader(void) {
_delay_ms(10); // removing delay causes USB errors
//DBG1(0x01, 0, 0);
bootLoaderExit();
cli();
USB_INTR_ENABLE = 0;
USB_INTR_CFG = 0; /* also reset config bits */
// clear magic word from bottom of stack before jumping to the app
*(uint8_t*)(RAMEND) = 0x00;
*(uint8_t*)(RAMEND-1) = 0x00;
// jump to application reset vector at end of flash
asm volatile ("rjmp __vectors - 4");
}
int __attribute__((noreturn)) main(void) {
/* initialize */
#ifdef RESTORE_OSCCAL
uint8_t osccal_default = OSCCAL;
#endif
#if (!SET_CLOCK_PRESCALER) && LOW_POWER_MODE
uint8_t prescaler_default = CLKPR;
#endif
wdt_disable(); /* main app may have enabled watchdog */
tiny85FlashInit();
bootLoaderInit();
if (bootLoaderStartCondition()) {
#if LOW_POWER_MODE
// turn off clock prescalling - chip must run at full speed for usb
// if you might run chip at lower voltages, detect that in bootLoaderStartCondition
CLKPR = 1 << CLKPCE;
CLKPR = 0;
#endif
initForUsbConnectivity();
do {
usbPoll();
_delay_us(100);
idlePolls++;
// these next two freeze the chip for ~ 4.5ms, breaking usb protocol
// and usually both of these will activate in the same loop, so host
// needs to wait > 9ms before next usb request
if (isEvent(EVENT_ERASE_APPLICATION)) eraseApplication();
if (isEvent(EVENT_WRITE_PAGE)) tiny85FlashWrites();
# if BOOTLOADER_CAN_EXIT
if (isEvent(EVENT_EXECUTE)) { // when host requests device run uploaded program
break;
}
# endif
clearEvents();
} while(bootLoaderCondition()); /* main event loop runs so long as bootLoaderCondition remains truthy */
}
// set clock prescaler to desired clock speed (changing from clkdiv8, or no division, depending on fuses)
#if LOW_POWER_MODE
#ifdef SET_CLOCK_PRESCALER
CLKPR = 1 << CLKPCE;
CLKPR = SET_CLOCK_PRESCALER;
#else
CLKPR = 1 << CLKPCE;
CLKPR = prescaler_default;
#endif
#endif
// slowly bring down OSCCAL to it's original value before launching in to user program
#ifdef RESTORE_OSCCAL
while (OSCCAL > osccal_default) { OSCCAL -= 1; }
#endif
leaveBootloader();
}
/* ------------------------------------------------------------------------ */
|