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https://github.com/apache/nuttx.git
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Gregory Nutt
116 lines
4.3 KiB
C
Executable File
116 lines
4.3 KiB
C
Executable File
/****************************************************************************
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* drivers/mtd/mtd_rawnand.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* This logic was based largely on Atmel sample code with modifications for
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* better integration with NuttX. The Atmel sample code has a BSD
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* compatibile license that requires this copyright notice:
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*
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* Copyright (c) 2011, 2012, Atmel Corporation
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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 names NuttX nor Atmel nor the names of its contributors
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* may be 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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/mtd/nand_config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/mtd/nand_raw.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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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: nand_chipid
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*
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* Description:
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* Reads and returns the identifiers of a NAND FLASH chip
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*
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* Input Parameters:
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* raw - Pointer to a struct nand_raw_s instance.
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*
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* Returned Value:
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* id1|(id2<<8)|(id3<<16)|(id4<<24)
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*
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****************************************************************************/
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uint32_t nand_chipid(struct nand_raw_s *raw)
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{
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uint8_t id[5];
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DEBUGASSERT(raw);
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WRITE_COMMAND8(raw, COMMAND_READID);
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WRITE_ADDRESS8(raw, 0);
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id[0] = READ_DATA8(raw);
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id[1] = READ_DATA8(raw);
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id[2] = READ_DATA8(raw);
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id[3] = READ_DATA8(raw);
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id[4] = READ_DATA8(raw);
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fvdbg("Chip ID: %02x %02x %02x %02x %02x\n",
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id[0], id[1], id[2], id[3], id[4]);
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return (uint32_t)id[0] |
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((uint32_t)id[1] << 8) |
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((uint32_t)id[2] << 16) |
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((uint32_t)id[3] << 24);
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}
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