/* * avrdude - A Downloader/Uploader for AVR device programmers * Copyright (C) 2000, 2001, 2002, 2003 Brian S. Dean * Copyright (C) 2005 Michael Holzt * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* $Id$ */ #include "ac_cfg.h" #include #include #include #include #include #include #include "avr.h" #include "pindefs.h" #include "pgm.h" #include "par.h" #include "serbb.h" #define SLOW_TOGGLE 0 extern char * progname; extern int do_cycles; extern int verbose; static int bitbang_setpin(PROGRAMMER * pgm, int pin, int value) { if ( pgm->flag ) serbb_setpin(pgm->fd,pin,value); else par_setpin(pgm->fd,pin,value); return 0; } static int bitbang_getpin(PROGRAMMER * pgm, int pin) { if ( pgm->flag ) return serbb_getpin(pgm->fd,pin); else return par_getpin(pgm->fd,pin); } static int bitbang_highpulsepin(PROGRAMMER * pgm, int pin) { if ( pgm->flag ) return serbb_highpulsepin(pgm->fd,pin); else return par_highpulsepin(pgm->fd,pin); } /* * transmit and receive a byte of data to/from the AVR device */ static unsigned char bitbang_txrx(PROGRAMMER * pgm, unsigned char byte) { int i; unsigned char r, b, rbyte; rbyte = 0; for (i=7; i>=0; i--) { /* * Write and read one bit on SPI. * Some notes on timing: Let T be the time it takes to do * one bitbang_setpin()-call resp. par clrpin()-call, then * - SCK is high for 2T * - SCK is low for 2T * - MOSI setuptime is 1T * - MOSI holdtime is 3T * - SCK low to MISO read is 2T to 3T * So we are within programming specs (expect for AT90S1200), * if and only if T>t_CLCL (t_CLCL=clock period of target system). * * Due to the delay introduced by "IN" and "OUT"-commands, * T is greater than 1us (more like 2us) on x86-architectures. * So programming works safely down to 1MHz target clock. */ b = (byte >> i) & 0x01; /* set the data input line as desired */ bitbang_setpin(pgm, pgm->pinno[PIN_AVR_MOSI], b); bitbang_setpin(pgm, pgm->pinno[PIN_AVR_SCK], 1); /* * read the result bit (it is either valid from a previous falling * edge or it is ignored in the current context) */ r = bitbang_getpin(pgm, pgm->pinno[PIN_AVR_MISO]); bitbang_setpin(pgm, pgm->pinno[PIN_AVR_SCK], 0); rbyte |= r << i; } return rbyte; } int bitbang_rdy_led(PROGRAMMER * pgm, int value) { bitbang_setpin(pgm, pgm->pinno[PIN_LED_RDY], !value); return 0; } int bitbang_err_led(PROGRAMMER * pgm, int value) { bitbang_setpin(pgm, pgm->pinno[PIN_LED_ERR], !value); return 0; } int bitbang_pgm_led(PROGRAMMER * pgm, int value) { bitbang_setpin(pgm, pgm->pinno[PIN_LED_PGM], !value); return 0; } int bitbang_vfy_led(PROGRAMMER * pgm, int value) { bitbang_setpin(pgm, pgm->pinno[PIN_LED_VFY], !value); return 0; } /* * transmit an AVR device command and return the results; 'cmd' and * 'res' must point to at least a 4 byte data buffer */ int bitbang_cmd(PROGRAMMER * pgm, unsigned char cmd[4], unsigned char res[4]) { int i; for (i=0; i<4; i++) { res[i] = bitbang_txrx(pgm, cmd[i]); } if(verbose >= 2) { fprintf(stderr, "bitbang_cmd(): [ "); for(i = 0; i < 4; i++) fprintf(stderr, "%02X ", cmd[i]); fprintf(stderr, "] [ "); for(i = 0; i < 4; i++) { fprintf(stderr, "%02X ", res[i]); } fprintf(stderr, "]\n"); } return 0; } /* * issue the 'chip erase' command to the AVR device */ int bitbang_chip_erase(PROGRAMMER * pgm, AVRPART * p) { unsigned char cmd[4]; unsigned char res[4]; if (p->op[AVR_OP_CHIP_ERASE] == NULL) { fprintf(stderr, "chip erase instruction not defined for part \"%s\"\n", p->desc); return -1; } pgm->pgm_led(pgm, ON); memset(cmd, 0, sizeof(cmd)); avr_set_bits(p->op[AVR_OP_CHIP_ERASE], cmd); pgm->cmd(pgm, cmd, res); usleep(p->chip_erase_delay); pgm->initialize(pgm, p); pgm->pgm_led(pgm, OFF); return 0; } /* * issue the 'program enable' command to the AVR device */ int bitbang_program_enable(PROGRAMMER * pgm, AVRPART * p) { unsigned char cmd[4]; unsigned char res[4]; if (p->op[AVR_OP_PGM_ENABLE] == NULL) { fprintf(stderr, "program enable instruction not defined for part \"%s\"\n", p->desc); return -1; } memset(cmd, 0, sizeof(cmd)); avr_set_bits(p->op[AVR_OP_PGM_ENABLE], cmd); pgm->cmd(pgm, cmd, res); if (res[2] != cmd[1]) return -2; return 0; } /* * initialize the AVR device and prepare it to accept commands */ int bitbang_initialize(PROGRAMMER * pgm, AVRPART * p) { int rc; int tries; pgm->powerup(pgm); usleep(20000); bitbang_setpin(pgm, pgm->pinno[PIN_AVR_SCK], 0); bitbang_setpin(pgm, pgm->pinno[PIN_AVR_RESET], 0); usleep(20000); bitbang_highpulsepin(pgm, pgm->pinno[PIN_AVR_RESET]); usleep(20000); /* 20 ms XXX should be a per-chip parameter */ /* * Enable programming mode. If we are programming an AT90S1200, we * can only issue the command and hope it worked. If we are using * one of the other chips, the chip will echo 0x53 when issuing the * third byte of the command. In this case, try up to 32 times in * order to possibly get back into sync with the chip if we are out * of sync. */ if (strcmp(p->desc, "AT90S1200")==0) { pgm->program_enable(pgm, p); } else { tries = 0; do { rc = pgm->program_enable(pgm, p); if ((rc == 0)||(rc == -1)) break; bitbang_highpulsepin(pgm, pgm->pinno[p->retry_pulse/*PIN_AVR_SCK*/]); tries++; } while (tries < 65); /* * can't sync with the device, maybe it's not attached? */ if (rc) { fprintf(stderr, "%s: AVR device not responding\n", progname); return -1; } } return 0; }