/* flash_io.host.c */ /* avr.flash - AVR Flash SPI use. {{{ * * Copyright (C) 2009 Nelio Laranjeiro * * APBTeam: * Web: http://apbteam.org/ * Email: team AT apbteam DOT org * * 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. * * }}} */ #include "flash_io.host.h" #include #include #include #include #include #include struct flash_io_t { /** Status of the flash memory. */ uint8_t status; /** File to store, read the data. */ int file; }; static struct flash_io_t flash; /** Deactivate the flash memory. */ static void flash_io_deactivate (void) { flash.status = 0; if (flash.file) close (flash.file); } void flash_io_erase (uint32_t start_addr, uint32_t size) { if (flash.status && size) { uint8_t data = 0xFF; int res; /* Set the stream to the correct position. */ lseek (flash.file, start_addr, SEEK_SET); for (res = 1; (res != -1) && size; size--) res = write (flash.file, &data, sizeof (uint8_t)); if ((res < 0) && size) flash_io_deactivate (); } } uint8_t flash_io_init (uint32_t flash_size) { memset (&flash, 0, sizeof (struct flash_io_t)); flash.file = open ("flash.apb", O_CREAT | O_RDWR, S_IREAD | S_IWRITE); if (flash.file > 0) { struct stat fstats; fstat (flash.file, &fstats); if ((uint32_t) fstats.st_size == flash_size) { /* Set the stream to the beginning of the file. */ lseek (flash.file, 0, SEEK_SET); flash.status = 1; } else { flash.status = 1; flash_io_erase (flash_size, 0); fstat (flash.file, &fstats); if ((uint32_t) fstats.st_size != flash_size) flash_io_deactivate (); } } else flash_io_deactivate (); return flash.status; } void flash_io_write (uint32_t addr, uint8_t data) { if (flash.status) { uint8_t res; /* Set the stream to the position of address. */ lseek (flash.file, addr, SEEK_SET); res = write (flash.file, &data, sizeof (uint8_t)); if (res == 0) flash_io_deactivate (); } } uint8_t flash_io_read (uint32_t addr) { if (flash.status) { uint8_t res; uint8_t data; /* Set the stream to the position of address. */ lseek (flash.file, addr, SEEK_SET); res = read (flash.file, &data, sizeof (uint8_t)); if (res == 0) flash_io_deactivate (); return data; } return 0xFF; } void flash_io_read_array (uint32_t addr, uint8_t *buffer, uint32_t length) { if (flash.status) { uint8_t res; uint8_t deactivate = 1; /* Set the stream to the position of address. */ res = lseek (flash.file, addr, SEEK_SET); if (res == addr) { res = read (flash.file, buffer, length); printf ("read: %d\n", res); if (res == length) deactivate = 0x0; } if (deactivate == 0x1) flash_io_deactivate (); } } void flash_io_write_array (uint32_t addr, uint8_t *data, uint32_t length) { if (flash.status) { uint8_t res; if (sizeof (data) >= length) { /* Set the stream to the position required. */ lseek (flash.file, addr, SEEK_SET); res = write (flash.file, data, length); if (res != length) flash_io_deactivate(); } else flash_io_deactivate(); } }