145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
/****************************************************************************
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* boards/arm/tiva/tm4c123g-launchpad/src/tm4c_at24.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <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/i2c_master.h>
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#include <nuttx/mtd/mtd.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/nxffs.h>
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#include "tiva_i2c.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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struct i2c_master_s *i2c;
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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 = tiva_i2cbus_initialize(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 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",
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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 = nx_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",
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ret);
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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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