+++ /dev/null
-/*!
- * \file
- * <!--
- * Copyright 2003, 2004, 2005 Develer S.r.l. (http://www.develer.com/)
- * This file is part of DevLib - See README.devlib for information.
- * -->
- *
- * \brief Driver for the 24xx16 and 24xx256 I2C EEPROMS (implementation)
- *
- * \note This implementation is AVR specific.
- *
- * \version $Id$
- * \author Stefano Fedrigo <aleph@develer.com>
- * \author Bernardo Innocenti <bernie@develer.com>
- */
-
-/*#*
- *#* $Log$
- *#* Revision 1.19 2006/03/20 17:49:50 bernie
- *#* Make the TWI driver more generic to work with devices other than EEPROMS.
- *#*
- *#* Revision 1.18 2005/11/27 23:33:40 bernie
- *#* Use appconfig.h instead of cfg/config.h.
- *#*
- *#* Revision 1.17 2005/04/11 19:10:27 bernie
- *#* Include top-level headers from cfg/ subdir.
- *#*
- *#* Revision 1.16 2005/03/01 23:25:09 bernie
- *#* Prune CVS log.
- *#*
- *#* Revision 1.11 2004/10/26 08:35:31 bernie
- *#* Reset watchdog for long operations.
- *#*
- *#* Revision 1.10 2004/09/20 03:31:22 bernie
- *#* Sanitize for C++.
- *#*
- *#* Revision 1.9 2004/09/14 21:03:46 bernie
- *#* Use debug.h instead of kdebug.h.
- *#*/
-
-#include "eeprom.h"
-
-#include <cfg/debug.h>
-#include <appconfig.h> // CONFIG_EEPROM_VERIFY
-#include <cfg/macros.h> // MIN()
-#include <drv/twi.h>
-#include <drv/wdt.h>
-#include <mware/byteorder.h> // cpu_to_be16()
-
-#include <string.h> // memset()
-
-
-// Configuration sanity checks
-#if !defined(CONFIG_EEPROM_VERIFY) || (CONFIG_EEPROM_VERIFY != 0 && CONFIG_EEPROM_VERIFY != 1)
- #error CONFIG_EEPROM_VERIFY must be defined to either 0 or 1
-#endif
-
-/**
- * EEPROM ID code
- */
-#define EEPROM_ID 0xA0
-
-/**
- * This macros form the correct slave address for EEPROMs
- */
-#define EEPROM_ADDR(x) (EEPROM_ID | (((uint8_t)(x)) << 1))
-
-
-
-
-/*!
- * Copy \c count bytes from buffer \c buf to
- * eeprom at address \c addr.
- */
-static bool eeprom_writeRaw(e2addr_t addr, const void *buf, size_t count)
-{
- bool result = true;
- ASSERT(addr + count <= EEPROM_SIZE);
-
- while (count && result)
- {
- /*
- * Split write in multiple sequential mode operations that
- * don't cross page boundaries.
- */
- size_t size =
- MIN(count, (size_t)(EEPROM_BLKSIZE - (addr & (EEPROM_BLKSIZE - 1))));
-
- #if CONFIG_EEPROM_TYPE == EEPROM_24XX16
- /*
- * The 24LC16 uses the slave address as a 3-bit
- * block address.
- */
- uint8_t blk_addr = (uint8_t)((addr >> 8) & 0x07);
- uint8_t blk_offs = (uint8_t)addr;
-
- result =
- twi_start_w(EEPROM_ADDR(blk_addr))
- && twi_send(&blk_offs, sizeof blk_offs)
- && twi_send(buf, size);
-
- #elif CONFIG_EEPROM_TYPE == EEPROM_24XX256
-
- // 24LC256 wants big-endian addresses
- uint16_t addr_be = cpu_to_be16(addr);
-
- result =
- twi_start_w(EEPROM_ID)
- && twi_send((uint8_t *)&addr_be, sizeof addr_be)
- && twi_send(buf, size);
-
- #else
- #error Unknown device type
- #endif
-
- twi_stop();
-
- // DEBUG
- //kprintf("addr=%d, count=%d, size=%d, *#?=%d\n",
- // addr, count, size,
- // (EEPROM_BLKSIZE - (addr & (EEPROM_BLKSIZE - 1)))
- //);
-
- /* Update count and addr for next operation */
- count -= size;
- addr += size;
- buf = ((const char *)buf) + size;
- }
-
- if (!result)
- TRACEMSG("Write error!");
- return result;
-}
-
-
-#if CONFIG_EEPROM_VERIFY
-/*!
- * Check that the contents of an EEPROM range
- * match with a provided data buffer.
- *
- * \return true on success.
- */
-static bool eeprom_verify(e2addr_t addr, const void *buf, size_t count)
-{
- uint8_t verify_buf[16];
- bool result = true;
-
- while (count && result)
- {
- /* Split read in smaller pieces */
- size_t size = MIN(count, sizeof verify_buf);
-
- /* Read back buffer */
- if (eeprom_read(addr, verify_buf, size))
- {
- if (memcmp(buf, verify_buf, size) != 0)
- {
- TRACEMSG("Data mismatch!");
- result = false;
- }
- }
- else
- {
- TRACEMSG("Read error!");
- result = false;
- }
-
- /* Update count and addr for next operation */
- count -= size;
- addr += size;
- buf = ((const char *)buf) + size;
- }
-
- return result;
-}
-#endif /* CONFIG_EEPROM_VERIFY */
-
-
-bool eeprom_write(e2addr_t addr, const void *buf, size_t count)
-{
-#if CONFIG_EEPROM_VERIFY
- int retries = 5;
-
- while (retries--)
- if (eeprom_writeRaw(addr, buf, count)
- && eeprom_verify(addr, buf, count))
- return true;
-
- return false;
-
-#else /* !CONFIG_EEPROM_VERIFY */
- return eeprom_writeRaw(addr, buf, count);
-#endif /* !CONFIG_EEPROM_VERIFY */
-}
-
-
-/*!
- * Copy \c count bytes at address \c addr
- * from eeprom to RAM to buffer \c buf.
- *
- * \return true on success.
- */
-bool eeprom_read(e2addr_t addr, void *buf, size_t count)
-{
- ASSERT(addr + count <= EEPROM_SIZE);
-
-#if CONFIG_EEPROM_TYPE == EEPROM_24XX16
- /*
- * The 24LC16 uses the slave address as a 3-bit
- * block address.
- */
- uint8_t blk_addr = (uint8_t)((addr >> 8) & 0x07);
- uint8_t blk_offs = (uint8_t)addr;
-
- bool res =
- twi_start_w(EEPROM_ADDR(blk_addr))
- && twi_send(&blk_offs, sizeof blk_offs)
- && twi_start_r(EEPROM_ADDR(blk_addr))
- && twi_recv(buf, count);
-
-#elif CONFIG_EEPROM_TYPE == EEPROM_24XX256
-
- // 24LC256 wants big-endian addresses
- addr = cpu_to_be16(addr);
-
- bool res =
- twi_start_w(EEPROM_ID)
- && twi_send((uint8_t *)&addr, sizeof(addr))
- && twi_start_r(EEPROM_ID)
- && twi_recv(buf, count);
-#else
- #error Unknown device type
-#endif
-
- twi_stop();
-
- if (!res)
- TRACEMSG("Read error!");
- return res;
-}
-
-
-/*!
- * Write a single character \a c at address \a addr.
- */
-bool eeprom_write_char(e2addr_t addr, char c)
-{
- return eeprom_write(addr, &c, 1);
-}
-
-
-/*!
- * Read a single character at address \a addr.
- *
- * \return the requested character or -1 in case of failure.
- */
-int eeprom_read_char(e2addr_t addr)
-{
- char c;
-
- if (eeprom_read(addr, &c, 1))
- return c;
- else
- return -1;
-}
-
-
-/*!
- * Erase specified part of eeprom, writing 0xFF.
- *
- * \param addr starting address
- * \param count length of block to erase
- */
-void eeprom_erase(e2addr_t addr, size_t count)
-{
- uint8_t buf[EEPROM_BLKSIZE];
- memset(buf, 0xFF, sizeof buf);
-
- // Clear all but struct hw_info at start of eeprom
- while (count)
- {
- // Long operation, reset watchdog
- wdt_reset();
-
- size_t size = MIN(count, sizeof buf);
- eeprom_write(addr, buf, size);
- addr += size;
- count -= size;
- }
-}
-
-
-/*!
- * Initialize TWI module.
- */
-void eeprom_init(void)
-{
- twi_init();
-}
-
-
-#ifdef _DEBUG
-
-#include <string.h>
-
-void eeprom_test(void)
-{
- static const char magic[14] = "Humpty Dumpty";
- char buf[sizeof magic];
- size_t i;
-
- // Write something to EEPROM using unaligned sequential writes
- for (i = 0; i < 42; ++i)
- {
- wdt_reset();
- eeprom_write(i * sizeof magic, magic, sizeof magic);
- }
-
- // Read back with single-byte reads
- for (i = 0; i < 42 * sizeof magic; ++i)
- {
- wdt_reset();
- eeprom_read(i, buf, 1);
- kprintf("EEPROM byte read: %c (%d)\n", buf[0], buf[0]);
- ASSERT(buf[0] == magic[i % sizeof magic]);
- }
-
- // Read back again using sequential reads
- for (i = 0; i < 42; ++i)
- {
- wdt_reset();
- memset(buf, 0, sizeof buf);
- eeprom_read(i * sizeof magic, buf, sizeof magic);
- kprintf("EEPROM seq read @ 0x%x: '%s'\n", i * sizeof magic, buf);
- ASSERT(memcmp(buf, magic, sizeof magic) == 0);
- }
-}
-
-#endif // _DEBUG