157 lines
4.8 KiB
C
157 lines
4.8 KiB
C
/****************************************************************************
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* config/sama5d3x-ek/src/tm4c_at24.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/* AT24 Serial EEPROM
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*
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* A AT24C512 Serial EEPPROM was used for tested I2C. There are no I2C
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* devices on-board the Launchpad, but an external serial EEPROM module
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* module was used.
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*
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* The Serial EEPROM was mounted on an external adaptor board and connected
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* to the LaunchPad thusly:
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*
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* - VCC -- VCC
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* - GND -- GND
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* - PB2 -- SCL
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* - PB3 -- SDA
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/mount.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/i2c.h>
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#include <nuttx/mtd/mtd.h>
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#include <nuttx/fs/nxffs.h>
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#include "tm4c123g-launchpad.h"
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#ifdef HAVE_AT24
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tm4c_at24_automount
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*
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* Description:
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* Initialize and configure the AT24 serial EEPROM
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*
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****************************************************************************/
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int tm4c_at24_automount(int minor)
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{
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FAR struct i2c_dev_s *i2c;
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FAR struct mtd_dev_s *mtd;
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static bool initialized = false;
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int ret;
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/* Have we already initialized? */
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if (!initialized)
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{
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/* No.. Get the I2C bus driver */
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i2c = up_i2cinitialize(AT24_BUS);
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if (!i2c)
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{
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syslog(LOG_ERR, "ERROR: Failed to initialize SPI%d\n", AT24_BUS);
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return -ENODEV;
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}
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/* Now bind the I2C interface to the AT24 I2C EEPROM driver */
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mtd = at24c_initialize(i2c);
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if (!mtd)
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{
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syslog(LOG_ERR,
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"ERROR: Failed to bind SPI%d to the AT24 EEPROM driver\n",
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AT24_BUS);
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return -ENODEV;
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}
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#if defined(CONFIG_TM4C123G_LAUNCHPAD_AT24_FTL)
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/* And finally, use the FTL layer to wrap the MTD driver as a block driver */
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ret = ftl_initialize(AT24_MINOR, mtd);
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if (ret < 0)
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{
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syslog(LOG_ERR, "ERROR: Failed to initialize the FTL layer: %d\n", ret);
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return ret;
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}
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#elif defined(CONFIG_TM4C123G_LAUNCHPAD_AT24_NXFFS)
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/* Initialize to provide NXFFS on the MTD interface */
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ret = nxffs_initialize(mtd);
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if (ret < 0)
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{
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syslog(LOG_ERR, "ERROR: NXFFS initialization failed: %d\n", ret);
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return ret;
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}
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/* Mount the file system at /mnt/at24 */
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ret = mount(NULL, "/mnt/at24", "nxffs", 0, NULL);
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if (ret < 0)
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{
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syslog(LOG_ERR, "ERROR: Failed to mount the NXFFS volume: %d\n", errno);
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return ret;
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}
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#endif
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/* Now we are initialized */
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initialized = true;
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}
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return OK;
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}
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#endif /* HAVE_AT24 */
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