/* flash.c */ /* {{{ * * Copyright (C) 2008 NĂ©lio 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.h" #include "modules/proto/proto.h" #include "modules/spi/spi.h" #include "modules/utils/utils.h" /** Flash access. * The flash contains an address of 21 bits in a range from 0x0-0x1fffff. * This function shall access the memory directly by the SPI. * \param addr the address to provide to the flash memory. */ void flash_address (uint32_t addr) { /* The address must be sent */ spi_send ((addr >> 16) & 0x1f); spi_send (addr >> 8); spi_send (addr); } /** Erase the memory. * \param erase_type the erase type.. * \param start_addr the start address. */ void flash_erase (uint8_t cmd, uint32_t start_addr) { flash_send_command (FLASH_WREN); AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); /* send the command. */ spi_send (cmd); /* verify if the cmd is the full erase. */ if (cmd != FLASH_ERASE_FULL) { /* Send the start address */ flash_address (start_addr); } AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); while (flash_is_busy()); } /* Send a flash command to the flash memory (only a command). * \param cmd the command to send. */ void flash_send_command (uint8_t cmd) { AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); spi_send (cmd); AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); } /** Poll the busy bit in the Software Status Register of the flash memory. * \return the status register. */ uint8_t flash_read_status (void) { uint8_t res; AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); spi_send (FLASH_RDSR); res = spi_recv(); AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); return res; } /** Initialise the flash memory. * \return true if the flash is present, false otherwise. */ uint8_t flash_init (void) { uint8_t rsp[3]; AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); AC_FLASH_DDR |= _BV(AC_FLASH_BIT_SS); /* send the read-ID instruction. */ spi_init (SPI_IT_DISABLE | SPI_ENABLE | SPI_MASTER | SPI_MSB_FIRST | SPI_MASTER | SPI_CPOL_FALLING | SPI_CPHA_SETUP | SPI_FOSC_DIV16); AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); spi_send (FLASH_READ_ID); rsp[0] = spi_recv (); rsp[1] = spi_recv (); rsp[2] = spi_recv (); AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); if (rsp[0] != 0xBF) return 0; proto_send3b ('f',rsp[0], rsp[1], rsp[2]); if (flash_status_aai()) { flash_send_command (FLASH_WEDI); } /* Enables the flash to be writable. */ flash_send_command (FLASH_WREN); AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); spi_send (FLASH_WRSR); spi_send (0); AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); /* Read the flash status. */ proto_send1b ('s', flash_read_status()); return 1; } /** Find the first writable sector. * \param addr the address to start the research. * \return the address of the next sector. */ uint32_t flash_first_sector (void) { uint8_t rsp = 0; uint32_t addr; /* Search for the next address to start writing. */ for (addr = 0; (rsp != 0xFF) && (addr < FLASH_ADDRESS_HIGH); addr += FLASH_PAGE_SIZE) { rsp = flash_read (addr); } return addr < (FLASH_ADDRESS_HIGH + 1) ? addr - FLASH_PAGE_SIZE : FLASH_ADDRESS_ERROR; } /** Write in the flash byte provided in parameter. * \param data the buffer to store the data. */ void flash_write (uint32_t addr, uint8_t data) { flash_send_command (FLASH_WREN); while (flash_is_busy ()); AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); /* Write instruction. */ spi_send (FLASH_WRITE); flash_address (addr); spi_send (data); AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); /* Wait for the flash until it is busy */ while (flash_is_busy()); } /** Read the data at the address provided. * \return the data read. */ uint8_t flash_read (uint32_t addr) { uint8_t data; AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); /* Send the read instruction. */ spi_send (FLASH_READ); flash_address (addr); data = spi_recv (); AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); return data; } /** Read a data from the flash memory from the address provided and for a * length of the number of bytes provided. * \param address at which the data should be read. * \param buffer the buffer to fill with the read data. * \param length the length of the data to read. * */ void flash_read_array (uint32_t addr, uint8_t *buffer, uint32_t length) { uint8_t i; AC_FLASH_PORT &= ~_BV(AC_FLASH_BIT_SS); spi_send (FLASH_READ); flash_address (addr); for (i = 0; i < length; i++) { buffer[i] = spi_recv (); } AC_FLASH_PORT |= _BV(AC_FLASH_BIT_SS); } /** Write in the flash byte provided in parameter. * \param addr the address to store the data. * \param data the array to store. * \param length the array length */ void flash_write_array (uint32_t addr, uint8_t *data, uint32_t length) { uint32_t i; for (i = 0; i < length; i++) { flash_write (addr + i, data[i]); } }