diff options
Diffstat (limited to 'bootloaders/caterina/src/Caterina.cpp')
| -rw-r--r-- | bootloaders/caterina/src/Caterina.cpp | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/bootloaders/caterina/src/Caterina.cpp b/bootloaders/caterina/src/Caterina.cpp deleted file mode 100644 index 7ef6fa8..0000000 --- a/bootloaders/caterina/src/Caterina.cpp +++ /dev/null @@ -1,251 +0,0 @@ - - -#include "Platform.h" - -// This bootloader creates a composite Serial device -// -// The serial interface supports a STK500v1 protocol that is very similar to optiboot -// -// The bootloader will timeout and start the firmware after a few hundred milliseconds -// if a usb connection is not detected. -// -// The tweakier code is to keep the bootloader below 2k (no interrupt table, for example) - -extern "C" -void entrypoint(void) __attribute__ ((naked)) __attribute__ ((section (".vectors"))); -void entrypoint(void) -{ - asm volatile ( - "eor r1, r1\n" // Zero register - "out 0x3F, r1\n" // SREG - "ldi r28, 0xFF\n" - "ldi r29, 0x0A\n" - "out 0x3E, r29\n" // SPH - "out 0x3D, r28\n" // SPL - "rjmp main" // Stack is all set up, start the main code - ::); -} - -uint8_t _flashbuf[128]; -uint8_t _inSync; -uint8_t _ok; -extern volatile uint8_t _ejected; -extern volatile uint16_t _timeout; - -void Program(uint8_t ep, uint16_t page, uint8_t count) -{ - uint8_t write = page < 30*1024; // Don't write over firmware please - if (write) - boot_page_erase(page); - - Recv(ep,_flashbuf,count); // Read while page is erasing - - if (!write) - return; - - boot_spm_busy_wait(); // Wait until the memory is erased. - - count >>= 1; - uint16_t* p = (uint16_t*)page; - uint16_t* b = (uint16_t*)_flashbuf; - for (uint8_t i = 0; i < count; i++) - boot_page_fill(p++, b[i]); - - boot_page_write(page); - boot_spm_busy_wait(); - boot_rww_enable (); -} - -void StartSketch(); -int USBGetChar(); -#define getch USBGetChar - -#define HW_VER 0x02 -#define SW_MAJOR 0x01 -#define SW_MINOR 0x10 - -#define STK_OK 0x10 -#define STK_INSYNC 0x14 // ' ' -#define CRC_EOP 0x20 // 'SPACE' -#define STK_GET_SYNC 0x30 // '0' - -#define STK_GET_PARAMETER 0x41 // 'A' -#define STK_SET_DEVICE 0x42 // 'B' -#define STK_SET_DEVICE_EXT 0x45 // 'E' -#define STK_LOAD_ADDRESS 0x55 // 'U' -#define STK_UNIVERSAL 0x56 // 'V' -#define STK_PROG_PAGE 0x64 // 'd' -#define STK_READ_PAGE 0x74 // 't' -#define STK_READ_SIGN 0x75 // 'u' - -extern const uint8_t _readSize[] PROGMEM; -const uint8_t _readSize[] = -{ - STK_GET_PARAMETER, 1, - STK_SET_DEVICE, 20, - STK_SET_DEVICE_EXT, 5, - STK_UNIVERSAL, 4, - STK_LOAD_ADDRESS, 2, - STK_PROG_PAGE, 3, - STK_READ_PAGE, 3, - 0,0 -}; - -extern const uint8_t _consts[] PROGMEM; -const uint8_t _consts[] = -{ - SIGNATURE_0, - SIGNATURE_1, - SIGNATURE_2, - HW_VER, // Hardware version - SW_MAJOR, // Software major version - SW_MINOR, // Software minor version - 0x03, // Unknown but seems to be required by avr studio 3.56 - 0x00, // -}; - - -void USBInit(void); -int main(void) __attribute__ ((naked)); - -// STK500v1 main loop, very similar to optiboot in protocol and implementation -int main() -{ - uint8_t MCUSR_state = MCUSR; // store the reason for the reset - MCUSR &= ~(1 << WDRF); // must clear the watchdog reset flag before disabling and reenabling WDT - wdt_disable(); - TX_LED_OFF(); - RX_LED_OFF(); - L_LED_OFF(); - if (MCUSR_state & (1<<WDRF) && (pgm_read_word(0) != 0xFFFF)) { - StartSketch(); // if the reset was caused by WDT and if a sketch is already present then run the sketch instead of the bootloader - } - BOARD_INIT(); - USBInit(); - - _inSync = STK_INSYNC; - _ok = STK_OK; - - if (pgm_read_word(0) != 0xFFFF) - _ejected = 1; - - for(;;) - { - uint8_t* packet = _flashbuf; - uint16_t address = 0; - for (;;) - { - uint8_t cmd = getch(); - - // Read packet contents - uint8_t len; - const uint8_t* rs = _readSize; - for(;;) - { - uint8_t c = pgm_read_byte(rs++); - len = pgm_read_byte(rs++); - if (c == cmd || c == 0) - break; - } - _timeout = 0; - // Read params - Recv(CDC_RX,packet,len); - - // Send a response - uint8_t send = 0; - const uint8_t* pgm = _consts+7; // 0 - if (STK_GET_PARAMETER == cmd) - { - uint8_t i = packet[0] - 0x80; - if (i > 2) - i = (i == 0x18) ? 3 : 4; // 0x80:HW_VER,0x81:SW_MAJOR,0x82:SW_MINOR,0x18:3 or 0 - pgm = _consts + i + 3; - send = 1; - } - - else if (STK_UNIVERSAL == cmd) - { - if (packet[0] == 0x30) - pgm = _consts + packet[2]; // read signature - send = 1; - } - - // Read signature bytes - else if (STK_READ_SIGN == cmd) - { - pgm = _consts; - send = 3; - } - - else if (STK_LOAD_ADDRESS == cmd) - { - address = *((uint16_t*)packet); // word addresses - address += address; - } - - else if (STK_PROG_PAGE == cmd) - { - Program(CDC_RX,address,packet[1]); - } - - else if (STK_READ_PAGE == cmd) - { - send = packet[1]; - pgm = (const uint8_t*)address; - address += send; // not sure of this is required - } - - // Check sync - if (getch() != ' ') - break; - Transfer(CDC_TX,&_inSync,1); - - // Send result - if (send) - Transfer(CDC_TX|TRANSFER_PGM,pgm,send); // All from pgm memory - - // Send ok - Transfer(CDC_TX|TRANSFER_RELEASE,&_ok,1); - - if (cmd == 'Q') - break; - } - _timeout = 500; // wait a moment before exiting the bootloader - may need to finish responding to 'Q' for example - _ejected = 1; - } -} - -// Nice breathing LED indicates we are in the firmware -uint16_t _pulse; -void LEDPulse() -{ - _pulse += 4; - uint8_t p = _pulse >> 9; - if (p > 63) - p = 127-p; - p += p; - if (((uint8_t)_pulse) > p) - L_LED_OFF(); - else - L_LED_ON(); -} - -void StartSketch() -{ - TX_LED_OFF(); // switch off the RX and TX LEDs before starting the user sketch - RX_LED_OFF(); - UDCON = 1; // Detach USB - UDIEN = 0; - asm volatile ( // Reset vector to run firmware - "clr r30\n" - "clr r31\n" - "ijmp\n" - ::); -} - -void Reset() -{ - wdt_enable(WDTO_15MS); // reset the microcontroller to reinitialize all IO and other registers - for (;;) - ; -} |