/* $Id$ */ /* * Copyright (c) 2011 Dimitri Sokolyuk * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include /* depends on BAUD & F_CPU env vars */ #include #define TIMEOUT (F_CPU >> 3) /* ca. 2 sec */ union { uint16_t word; uint8_t byte[2]; } data; void reboot() { boot_rww_enable(); ((void(*)(void))0)(); /* jump to app */ } void putch(char c) { if (c == '\n') putch('\r'); /* be unix polite */ loop_until_bit_is_set(UCSRA, UDRE); UDR = c; } uint8_t getch(void) { uint32_t counter = 0; do { if (++counter > TIMEOUT) reboot(); } while (bit_is_clear(UCSRA, RXC)); return UDR; } int main(void) { uint8_t i; uint16_t off; UCSRB = _BV(RXEN) | _BV(TXEN); UBRRH = UBRRH_VALUE; UBRRL = UBRRL_VALUE; UCSRA &= ~_BV(U2X); putch('+'); /* say hallo */ if (getch() != 'P') /* wait a while for program request */ reboot(); putch('p'); /* confirm */ for (;;) { switch (getch()) { case 'D': /* data request */ off = (uint16_t)getch() * SPM_PAGESIZE; for (i = 0; i < SPM_PAGESIZE; i += 2) { data.byte[0] = getch(); data.byte[1] = getch(); boot_page_fill(off + i, data.word); } boot_page_erase(off); boot_spm_busy_wait(); boot_page_write(off); boot_spm_busy_wait(); putch('d'); /* confirm */ break; case 'R': /* reboot request */ reboot(); break; default: break; } } return 0; }