diff options
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/main.c | 52 |
1 files changed, 28 insertions, 24 deletions
diff --git a/firmware/main.c b/firmware/main.c index d0c7722..60c3e23 100644 --- a/firmware/main.c +++ b/firmware/main.c @@ -112,9 +112,8 @@ static uint16_t vectorTemp[2]; // remember data to create tinyVector table befor static addr_t currentAddress; // current progmem address, used for erasing and writing #ifdef RESTORE_OSCCAL - static uint8_t osccal_default; // due to compiler insanity, having this as global actually saves memory -#endif - + static uint8_t osccal_default; // due to compiler insanity, having this as global actually saves memory +#endif /* ------------------------------------------------------------------------ */ static inline void eraseApplication(void); @@ -179,21 +178,12 @@ static void writeFlashPage(void) { // write a word in to the page buffer, doing interrupt table modifications where they're required static void writeWordToPageBuffer(uint16_t data) { uint8_t previous_sreg; - // make sure we don't write over the bootloader! - if (currentAddress >= BOOTLOADER_ADDRESS) return; - - // remember first two interrupt vectors for the tinyvector table - // and replace them with a jump to the bootloader's vector table - if (currentAddress == RESET_VECTOR_OFFSET * 2) { - vectorTemp[0] = *(short *)data; - data = 0xC000 + (BOOTLOADER_ADDRESS/2) - 1; - } - - if (currentAddress == USBPLUS_VECTOR_OFFSET * 2) { - vectorTemp[1] = *(short *)data; - data = 0xC000 + (BOOTLOADER_ADDRESS/2) - 1; - } - + + // 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 @@ -201,10 +191,10 @@ static void writeWordToPageBuffer(uint16_t data) { data = vectorTemp[0] + ((FLASHEND + 1) - BOOTLOADER_ADDRESS)/2 + 2 + RESET_VECTOR_OFFSET; } else if (currentAddress == BOOTLOADER_ADDRESS - TINYVECTOR_USBPLUS_OFFSET) { data = vectorTemp[1] + ((FLASHEND + 1) - BOOTLOADER_ADDRESS)/2 + 1 + USBPLUS_VECTOR_OFFSET; -#ifndef RESTORE_OSCCAL +#ifndef RESTORE_OSCCAL } else if (currentAddress == BOOTLOADER_ADDRESS - TINYVECTOR_OSCCAL_OFFSET) { data = OSCCAL; -#endif +#endif } @@ -297,6 +287,21 @@ static uchar usbFunctionWrite(uchar *data, uchar length) { //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; @@ -345,9 +350,9 @@ 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_byte(RESET_VECTOR_OFFSET * 2+1) == 0xff) fillFlashWithVectors(); // write vectors if flash is empty + if(pgm_read_byte(RESET_VECTOR_OFFSET * 2+1) == 0xff) fillFlashWithVectors(); // write vectors if flash is empty + // TODO: necessary to reset currentAddress? currentAddress = 0; } @@ -397,7 +402,7 @@ static inline void leaveBootloader(void) { *(uint8_t*)(RAMEND) = 0x00; // A single write is sufficient to invalidate magic word // *(uint8_t*)(RAMEND-1) = 0x00; -#ifndef RESTORE_OSCCAL +#ifndef RESTORE_OSCCAL // adjust clock to previous calibration value, so user program always starts with same calibration // as when it was uploaded originally // TODO: Test this and find out, do we need the +1 offset? @@ -410,7 +415,6 @@ static inline void leaveBootloader(void) { while (OSCCAL < stored_osc_calibration) OSCCAL++; } #endif - // jump to application reset vector at end of flash asm volatile ("rjmp __vectors - 4"); } |