560 lines
19 KiB
C
560 lines
19 KiB
C
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/* Driver for ATMEL DataFlash support
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* Author : Hamid Ikdoumi (Atmel)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <config.h>
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#include <common.h>
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#include <dataflash.h>
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/*
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* spi.c API
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*/
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extern unsigned int AT91F_SpiWrite(AT91PS_DataflashDesc pDesc);
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extern void AT91F_SpiEnable(int cs);
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#define AT91C_TIMEOUT_WRDY 200000
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/*----------------------------------------------------------------------*/
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/* \fn AT91F_DataFlashSendCommand */
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/* \brief Generic function to send a command to the dataflash */
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/*----------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_DataFlashSendCommand(AT91PS_DataFlash pDataFlash,
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unsigned char OpCode,
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unsigned int CmdSize,
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unsigned int DataflashAddress)
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{
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unsigned int adr;
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if ((pDataFlash->pDataFlashDesc->state) != IDLE)
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return DATAFLASH_BUSY;
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/* process the address to obtain page address and byte address */
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adr = ((DataflashAddress / (pDataFlash->pDevice->pages_size)) <<
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pDataFlash->pDevice->page_offset) +
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(DataflashAddress % (pDataFlash->pDevice->pages_size));
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/* fill the command buffer */
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pDataFlash->pDataFlashDesc->command[0] = OpCode;
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if (pDataFlash->pDevice->pages_number >= 16384) {
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pDataFlash->pDataFlashDesc->command[1] =
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(unsigned char)((adr & 0x0F000000) >> 24);
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pDataFlash->pDataFlashDesc->command[2] =
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(unsigned char)((adr & 0x00FF0000) >> 16);
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pDataFlash->pDataFlashDesc->command[3] =
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(unsigned char)((adr & 0x0000FF00) >> 8);
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pDataFlash->pDataFlashDesc->command[4] =
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(unsigned char)(adr & 0x000000FF);
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} else {
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pDataFlash->pDataFlashDesc->command[1] =
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(unsigned char)((adr & 0x00FF0000) >> 16);
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pDataFlash->pDataFlashDesc->command[2] =
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(unsigned char)((adr & 0x0000FF00) >> 8);
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pDataFlash->pDataFlashDesc->command[3] =
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(unsigned char)(adr & 0x000000FF);
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pDataFlash->pDataFlashDesc->command[4] = 0;
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}
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pDataFlash->pDataFlashDesc->command[5] = 0;
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pDataFlash->pDataFlashDesc->command[6] = 0;
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pDataFlash->pDataFlashDesc->command[7] = 0;
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/* Initialize the SpiData structure for the spi write fuction */
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pDataFlash->pDataFlashDesc->tx_cmd_pt =
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pDataFlash->pDataFlashDesc->command;
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pDataFlash->pDataFlashDesc->tx_cmd_size = CmdSize;
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pDataFlash->pDataFlashDesc->rx_cmd_pt =
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pDataFlash->pDataFlashDesc->command;
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pDataFlash->pDataFlashDesc->rx_cmd_size = CmdSize;
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/* send the command and read the data */
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return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
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}
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/*----------------------------------------------------------------------*/
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/* \fn AT91F_DataFlashGetStatus */
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/* \brief Read the status register of the dataflash */
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/*----------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_DataFlashGetStatus(AT91PS_DataflashDesc pDesc)
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{
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AT91S_DataFlashStatus status;
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/* if a transfert is in progress ==> return 0 */
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if ((pDesc->state) != IDLE)
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return DATAFLASH_BUSY;
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/* first send the read status command (D7H) */
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pDesc->command[0] = DB_STATUS;
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pDesc->command[1] = 0;
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pDesc->DataFlash_state = GET_STATUS;
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pDesc->tx_data_size = 0; /* Transmit the command */
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/* and receive response */
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pDesc->tx_cmd_pt = pDesc->command;
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pDesc->rx_cmd_pt = pDesc->command;
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pDesc->rx_cmd_size = 2;
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pDesc->tx_cmd_size = 2;
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status = AT91F_SpiWrite(pDesc);
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pDesc->DataFlash_state = *((unsigned char *)(pDesc->rx_cmd_pt) + 1);
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return status;
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}
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/*----------------------------------------------------------------------*/
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/* \fn AT91F_DataFlashWaitReady */
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/* \brief wait for dataflash ready (bit7 of the status register == 1) */
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/*----------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_DataFlashWaitReady(AT91PS_DataflashDesc
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pDataFlashDesc,
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unsigned int timeout)
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{
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pDataFlashDesc->DataFlash_state = IDLE;
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do {
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AT91F_DataFlashGetStatus(pDataFlashDesc);
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timeout--;
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} while (((pDataFlashDesc->DataFlash_state & 0x80) != 0x80) &&
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(timeout > 0));
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if ((pDataFlashDesc->DataFlash_state & 0x80) != 0x80)
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return DATAFLASH_ERROR;
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return DATAFLASH_OK;
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}
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/*--------------------------------------------------------------------------*/
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/* Function Name : AT91F_DataFlashContinuousRead */
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/* Object : Continuous stream Read */
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/* Input Parameters : DataFlash Service */
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/* : <src> = dataflash address */
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/* : <*dataBuffer> = data buffer pointer */
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/* : <sizeToRead> = data buffer size */
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/* Return value : State of the dataflash */
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/*--------------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_DataFlashContinuousRead(
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AT91PS_DataFlash pDataFlash,
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int src,
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unsigned char *dataBuffer,
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int sizeToRead)
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{
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AT91S_DataFlashStatus status;
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/* Test the size to read in the device */
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if ((src + sizeToRead) >
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(pDataFlash->pDevice->pages_size *
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(pDataFlash->pDevice->pages_number)))
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return DATAFLASH_MEMORY_OVERFLOW;
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pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
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pDataFlash->pDataFlashDesc->rx_data_size = sizeToRead;
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pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
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pDataFlash->pDataFlashDesc->tx_data_size = sizeToRead;
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status = AT91F_DataFlashSendCommand(
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pDataFlash, DB_CONTINUOUS_ARRAY_READ, 8, src);
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/* Send the command to the dataflash */
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return (status);
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}
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/*---------------------------------------------------------------------------*/
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/* Function Name : AT91F_DataFlashPagePgmBuf */
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/* Object : Main memory page program thru buffer 1 or buffer 2 */
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/* Input Parameters : DataFlash Service */
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/* : <*src> = Source buffer */
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/* : <dest> = dataflash destination address */
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/* : <SizeToWrite> = data buffer size */
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/* Return value : State of the dataflash */
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/*---------------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_DataFlashPagePgmBuf(AT91PS_DataFlash pDataFlash,
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unsigned char *src,
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unsigned int dest,
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unsigned int SizeToWrite)
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{
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int cmdsize;
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pDataFlash->pDataFlashDesc->tx_data_pt = src;
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pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
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pDataFlash->pDataFlashDesc->rx_data_pt = src;
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pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
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cmdsize = 4;
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/* Send the command to the dataflash */
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if (pDataFlash->pDevice->pages_number >= 16384)
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cmdsize = 5;
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return (AT91F_DataFlashSendCommand(
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pDataFlash, DB_PAGE_PGM_BUF1, cmdsize, dest));
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}
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/*---------------------------------------------------------------------------*/
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/* Function Name : AT91F_MainMemoryToBufferTransfert */
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/* Object : Read a page in the SRAM Buffer 1 or 2 */
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/* Input Parameters : DataFlash Service */
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/* : Page concerned */
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/* : */
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/* Return value : State of the dataflash */
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/*---------------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_MainMemoryToBufferTransfert(
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AT91PS_DataFlash
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pDataFlash,
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unsigned char
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BufferCommand,
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unsigned int page)
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{
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int cmdsize;
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/* Test if the buffer command is legal */
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if ((BufferCommand != DB_PAGE_2_BUF1_TRF) &&
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(BufferCommand != DB_PAGE_2_BUF2_TRF)) {
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return DATAFLASH_BAD_COMMAND;
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}
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/* no data to transmit or receive */
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pDataFlash->pDataFlashDesc->tx_data_size = 0;
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cmdsize = 4;
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if (pDataFlash->pDevice->pages_number >= 16384)
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cmdsize = 5;
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return (AT91F_DataFlashSendCommand(
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pDataFlash, BufferCommand, cmdsize,
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page * pDataFlash->pDevice->pages_size));
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}
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/*-------------------------------------------------------------------------- */
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/* Function Name : AT91F_DataFlashWriteBuffer */
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/* Object : Write data to the internal sram buffer 1 or 2 */
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/* Input Parameters : DataFlash Service */
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/* : <BufferCommand> = command to write buffer1 or 2 */
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/* : <*dataBuffer> = data buffer to write */
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/* : <bufferAddress> = address in the internal buffer */
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/* : <SizeToWrite> = data buffer size */
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/* Return value : State of the dataflash */
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/*---------------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_DataFlashWriteBuffer(
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AT91PS_DataFlash pDataFlash,
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unsigned char BufferCommand,
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unsigned char *dataBuffer,
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unsigned int bufferAddress,
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int SizeToWrite)
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{
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int cmdsize;
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/* Test if the buffer command is legal */
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if ((BufferCommand != DB_BUF1_WRITE) &&
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(BufferCommand != DB_BUF2_WRITE)) {
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return DATAFLASH_BAD_COMMAND;
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}
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/* buffer address must be lower than page size */
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if (bufferAddress > pDataFlash->pDevice->pages_size)
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return DATAFLASH_BAD_ADDRESS;
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if ((pDataFlash->pDataFlashDesc->state) != IDLE)
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return DATAFLASH_BUSY;
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/* Send first Write Command */
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pDataFlash->pDataFlashDesc->command[0] = BufferCommand;
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pDataFlash->pDataFlashDesc->command[1] = 0;
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if (pDataFlash->pDevice->pages_number >= 16384) {
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pDataFlash->pDataFlashDesc->command[2] = 0;
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pDataFlash->pDataFlashDesc->command[3] =
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(unsigned char)(((unsigned int)(bufferAddress &
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pDataFlash->pDevice->
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byte_mask)) >> 8);
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pDataFlash->pDataFlashDesc->command[4] =
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(unsigned char)((unsigned int)bufferAddress & 0x00FF);
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cmdsize = 5;
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} else {
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pDataFlash->pDataFlashDesc->command[2] =
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(unsigned char)(((unsigned int)(bufferAddress &
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pDataFlash->pDevice->
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byte_mask)) >> 8);
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pDataFlash->pDataFlashDesc->command[3] =
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(unsigned char)((unsigned int)bufferAddress & 0x00FF);
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pDataFlash->pDataFlashDesc->command[4] = 0;
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cmdsize = 4;
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}
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pDataFlash->pDataFlashDesc->tx_cmd_pt =
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pDataFlash->pDataFlashDesc->command;
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pDataFlash->pDataFlashDesc->tx_cmd_size = cmdsize;
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pDataFlash->pDataFlashDesc->rx_cmd_pt =
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pDataFlash->pDataFlashDesc->command;
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pDataFlash->pDataFlashDesc->rx_cmd_size = cmdsize;
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pDataFlash->pDataFlashDesc->rx_data_pt = dataBuffer;
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pDataFlash->pDataFlashDesc->tx_data_pt = dataBuffer;
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pDataFlash->pDataFlashDesc->rx_data_size = SizeToWrite;
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pDataFlash->pDataFlashDesc->tx_data_size = SizeToWrite;
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return AT91F_SpiWrite(pDataFlash->pDataFlashDesc);
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}
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/*---------------------------------------------------------------------------*/
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/* Function Name : AT91F_PageErase */
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/* Object : Erase a page */
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/* Input Parameters : DataFlash Service */
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/* : Page concerned */
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/* : */
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/* Return value : State of the dataflash */
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/*---------------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_PageErase(
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AT91PS_DataFlash pDataFlash,
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unsigned int page)
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{
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int cmdsize;
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/* Test if the buffer command is legal */
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/* no data to transmit or receive */
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pDataFlash->pDataFlashDesc->tx_data_size = 0;
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cmdsize = 4;
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if (pDataFlash->pDevice->pages_number >= 16384)
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cmdsize = 5;
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return (AT91F_DataFlashSendCommand(pDataFlash,
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DB_PAGE_ERASE, cmdsize,
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page * pDataFlash->pDevice->pages_size));
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}
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/*---------------------------------------------------------------------------*/
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/* Function Name : AT91F_BlockErase */
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/* Object : Erase a Block */
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/* Input Parameters : DataFlash Service */
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/* : Page concerned */
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/* : */
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/* Return value : State of the dataflash */
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/*---------------------------------------------------------------------------*/
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AT91S_DataFlashStatus AT91F_BlockErase(
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AT91PS_DataFlash pDataFlash,
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unsigned int block)
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{
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int cmdsize;
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/* Test if the buffer command is legal */
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/* no data to transmit or receive */
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pDataFlash->pDataFlashDesc->tx_data_size = 0;
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cmdsize = 4;
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if (pDataFlash->pDevice->pages_number >= 16384)
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cmdsize = 5;
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return (AT91F_DataFlashSendCommand(pDataFlash, DB_BLOCK_ERASE, cmdsize,
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block * 8 *
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pDataFlash->pDevice->pages_size));
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}
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/*---------------------------------------------------------------------------*/
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/* Function Name : AT91F_WriteBufferToMain */
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/* Object : Write buffer to the main memory */
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/* Input Parameters : DataFlash Service */
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/* : <BufferCommand> = command to send to buffer1 or buffer2 */
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/* : <dest> = main memory address */
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|
|
/* Return value : State of the dataflash */
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
AT91S_DataFlashStatus AT91F_WriteBufferToMain(AT91PS_DataFlash pDataFlash,
|
||
|
|
unsigned char BufferCommand,
|
||
|
|
unsigned int dest)
|
||
|
|
{
|
||
|
|
int cmdsize;
|
||
|
|
/* Test if the buffer command is correct */
|
||
|
|
if ((BufferCommand != DB_BUF1_PAGE_PGM) &&
|
||
|
|
(BufferCommand != DB_BUF1_PAGE_ERASE_PGM) &&
|
||
|
|
(BufferCommand != DB_BUF2_PAGE_PGM) &&
|
||
|
|
(BufferCommand != DB_BUF2_PAGE_ERASE_PGM))
|
||
|
|
return DATAFLASH_BAD_COMMAND;
|
||
|
|
|
||
|
|
/* no data to transmit or receive */
|
||
|
|
pDataFlash->pDataFlashDesc->tx_data_size = 0;
|
||
|
|
|
||
|
|
cmdsize = 4;
|
||
|
|
if (pDataFlash->pDevice->pages_number >= 16384)
|
||
|
|
cmdsize = 5;
|
||
|
|
/* Send the command to the dataflash */
|
||
|
|
return (AT91F_DataFlashSendCommand(pDataFlash, BufferCommand,
|
||
|
|
cmdsize, dest));
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/* Function Name : AT91F_PartialPageWrite */
|
||
|
|
/* Object : Erase partielly a page */
|
||
|
|
/* Input Parameters : <page> = page number */
|
||
|
|
/* : <AdrInpage> = adr to begin the fading */
|
||
|
|
/* : <length> = Number of bytes to erase */
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
AT91S_DataFlashStatus AT91F_PartialPageWrite(AT91PS_DataFlash pDataFlash,
|
||
|
|
unsigned char *src,
|
||
|
|
unsigned int dest,
|
||
|
|
unsigned int size)
|
||
|
|
{
|
||
|
|
unsigned int page;
|
||
|
|
unsigned int AdrInPage;
|
||
|
|
|
||
|
|
page = dest / (pDataFlash->pDevice->pages_size);
|
||
|
|
AdrInPage = dest % (pDataFlash->pDevice->pages_size);
|
||
|
|
|
||
|
|
/* Read the contents of the page in the Sram Buffer */
|
||
|
|
AT91F_MainMemoryToBufferTransfert(pDataFlash, DB_PAGE_2_BUF1_TRF, page);
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
/*Update the SRAM buffer */
|
||
|
|
AT91F_DataFlashWriteBuffer(pDataFlash, DB_BUF1_WRITE, src,
|
||
|
|
AdrInPage, size);
|
||
|
|
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
|
||
|
|
/* Erase page if a 128 Mbits device */
|
||
|
|
if (pDataFlash->pDevice->pages_number >= 16384) {
|
||
|
|
AT91F_PageErase(pDataFlash, page);
|
||
|
|
/* Rewrite the modified Sram Buffer in the main memory */
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Rewrite the modified Sram Buffer in the main memory */
|
||
|
|
return (AT91F_WriteBufferToMain(pDataFlash, DB_BUF1_PAGE_ERASE_PGM,
|
||
|
|
(page *
|
||
|
|
pDataFlash->pDevice->pages_size)));
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/* Function Name : AT91F_DataFlashWrite */
|
||
|
|
/* Object : */
|
||
|
|
/* Input Parameters : <*src> = Source buffer */
|
||
|
|
/* : <dest> = dataflash adress */
|
||
|
|
/* : <size> = data buffer size */
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
AT91S_DataFlashStatus AT91F_DataFlashWrite(AT91PS_DataFlash pDataFlash,
|
||
|
|
unsigned char *src,
|
||
|
|
int dest, int size)
|
||
|
|
{
|
||
|
|
unsigned int length;
|
||
|
|
unsigned int page;
|
||
|
|
unsigned int status;
|
||
|
|
|
||
|
|
AT91F_SpiEnable(pDataFlash->pDevice->cs);
|
||
|
|
|
||
|
|
if ((dest + size) > (pDataFlash->pDevice->pages_size *
|
||
|
|
(pDataFlash->pDevice->pages_number)))
|
||
|
|
return DATAFLASH_MEMORY_OVERFLOW;
|
||
|
|
|
||
|
|
/* If destination does not fit a page start address */
|
||
|
|
if ((dest % ((unsigned int)(pDataFlash->pDevice->pages_size))) != 0) {
|
||
|
|
length =
|
||
|
|
pDataFlash->pDevice->pages_size -
|
||
|
|
(dest % ((unsigned int)(pDataFlash->pDevice->pages_size)));
|
||
|
|
|
||
|
|
if (size < length)
|
||
|
|
length = size;
|
||
|
|
|
||
|
|
if (!AT91F_PartialPageWrite(pDataFlash, src, dest, length))
|
||
|
|
return DATAFLASH_ERROR;
|
||
|
|
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
|
||
|
|
/* Update size, source and destination pointers */
|
||
|
|
size -= length;
|
||
|
|
dest += length;
|
||
|
|
src += length;
|
||
|
|
}
|
||
|
|
|
||
|
|
while ((size - pDataFlash->pDevice->pages_size) >= 0) {
|
||
|
|
/* program dataflash page */
|
||
|
|
page = (unsigned int)dest / (pDataFlash->pDevice->pages_size);
|
||
|
|
|
||
|
|
status = AT91F_DataFlashWriteBuffer(pDataFlash,
|
||
|
|
DB_BUF1_WRITE, src, 0,
|
||
|
|
pDataFlash->pDevice->
|
||
|
|
pages_size);
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
|
||
|
|
status = AT91F_PageErase(pDataFlash, page);
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
if (!status)
|
||
|
|
return DATAFLASH_ERROR;
|
||
|
|
|
||
|
|
status = AT91F_WriteBufferToMain(pDataFlash,
|
||
|
|
DB_BUF1_PAGE_PGM, dest);
|
||
|
|
if (!status)
|
||
|
|
return DATAFLASH_ERROR;
|
||
|
|
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
|
||
|
|
/* Update size, source and destination pointers */
|
||
|
|
size -= pDataFlash->pDevice->pages_size;
|
||
|
|
dest += pDataFlash->pDevice->pages_size;
|
||
|
|
src += pDataFlash->pDevice->pages_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* If still some bytes to read */
|
||
|
|
if (size > 0) {
|
||
|
|
/* program dataflash page */
|
||
|
|
if (!AT91F_PartialPageWrite(pDataFlash, src, dest, size))
|
||
|
|
return DATAFLASH_ERROR;
|
||
|
|
|
||
|
|
AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY);
|
||
|
|
}
|
||
|
|
return DATAFLASH_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/* Function Name : AT91F_DataFlashRead */
|
||
|
|
/* Object : Read a block in dataflash */
|
||
|
|
/* Input Parameters : */
|
||
|
|
/* Return value : */
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
int AT91F_DataFlashRead(AT91PS_DataFlash pDataFlash,
|
||
|
|
unsigned long addr, unsigned long size, char *buffer)
|
||
|
|
{
|
||
|
|
unsigned long SizeToRead;
|
||
|
|
|
||
|
|
AT91F_SpiEnable(pDataFlash->pDevice->cs);
|
||
|
|
|
||
|
|
if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY) != DATAFLASH_OK)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
while (size) {
|
||
|
|
SizeToRead = (size < 0x8000) ? size : 0x8000;
|
||
|
|
|
||
|
|
if (AT91F_DataFlashWaitReady(pDataFlash->pDataFlashDesc,
|
||
|
|
AT91C_TIMEOUT_WRDY) !=
|
||
|
|
DATAFLASH_OK)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (AT91F_DataFlashContinuousRead(pDataFlash, addr,
|
||
|
|
(uchar *) buffer,
|
||
|
|
SizeToRead) != DATAFLASH_OK)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
size -= SizeToRead;
|
||
|
|
addr += SizeToRead;
|
||
|
|
buffer += SizeToRead;
|
||
|
|
}
|
||
|
|
|
||
|
|
return DATAFLASH_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
/* Function Name : AT91F_DataflashProbe */
|
||
|
|
/* Object : */
|
||
|
|
/* Input Parameters : */
|
||
|
|
/* Return value : Dataflash status register */
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
int AT91F_DataflashProbe(int cs, AT91PS_DataflashDesc pDesc)
|
||
|
|
{
|
||
|
|
AT91F_SpiEnable(cs);
|
||
|
|
AT91F_DataFlashGetStatus(pDesc);
|
||
|
|
return ((pDesc->command[1] == 0xFF) ? 0 : pDesc->command[1] & 0x3C);
|
||
|
|
}
|