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/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2008, Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------
#include "at45.h"
#include "at45d.h"
#include <board.h>
#include <utility/assert.h>
//------------------------------------------------------------------------------
// Local functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Wait for transfer to finish calling the SPI driver ISR (interrupts are
/// disabled).
/// \param pAt45 Pointer to an AT45 driver instance.
//------------------------------------------------------------------------------
static void AT45D_Wait(At45 *pAt45)
{
SANITY_CHECK(pAt45);
// Wait for transfer to finish
while (AT45_IsBusy(pAt45)) {
SPID_Handler(pAt45->pSpid);
}
}
//------------------------------------------------------------------------------
// Global functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
/// Waits for the At45 to be ready to accept new commands.
/// \param pAt45 Pointer to a At45 driver instance.
//------------------------------------------------------------------------------
void AT45D_WaitReady(At45 *pAt45)
{
unsigned char ready = 0;
SANITY_CHECK(pAt45);
// Poll device until it is ready
while (!ready) {
ready = AT45_STATUS_READY(AT45D_GetStatus(pAt45));
}
}
//------------------------------------------------------------------------------
/// Retrieves and returns the At45 current status, or 0 if an error
/// happened.
/// \param pAt45 Pointer to a At45 driver instance.
//------------------------------------------------------------------------------
unsigned char AT45D_GetStatus(At45 *pAt45)
{
unsigned char error;
unsigned char status;
SANITY_CHECK(pAt45);
// Issue a status register read command
error = AT45_SendCommand(pAt45, AT45_STATUS_READ, 1, &status, 1, 0, 0, 0);
ASSERT(!error, "-F- AT45_GetStatus: Failed to issue command.\n\r");
// Wait for command to terminate
while (AT45_IsBusy(pAt45)) {
AT45D_Wait(pAt45);
}
return status;
}
//------------------------------------------------------------------------------
/// Reads data from the At45 inside the provided buffer. Since a continuous
/// read command is used, there is no restriction on the buffer size and read
/// address.
/// \param pAt45 Pointer to a At45 driver instance.
/// \param pBuffer Data buffer.
/// \param size Number of bytes to read.
/// \param address Address at which data shall be read.
//------------------------------------------------------------------------------
void AT45D_Read(
At45 *pAt45,
unsigned char *pBuffer,
unsigned int size,
unsigned int address)
{
unsigned char error;
SANITY_CHECK(pAt45);
SANITY_CHECK(pBuffer);
// Issue a continuous read array command
error = AT45_SendCommand(pAt45, AT45_CONTINUOUS_READ_LEG, 8, pBuffer, size, address, 0, 0);
ASSERT(!error, "-F- AT45_Read: Failed to issue command\n\r");
// Wait for the read command to execute
while (AT45_IsBusy(pAt45)) {
AT45D_Wait(pAt45);
}
}
//------------------------------------------------------------------------------
/// Writes data on the At45 at the specified address. Only one page of
/// data is written that way; if the address is not at the beginning of the
/// page, the data is written starting from this address and wraps around to
/// the beginning of the page.
/// \param pAt45 Pointer to a At45 driver instance.
/// \param pBuffer Buffer containing the data to write.
/// \param size Number of bytes to write.
/// \param address Destination address on the At45.
//------------------------------------------------------------------------------
void AT45D_Write(
At45 *pAt45,
unsigned char *pBuffer,
unsigned int size,
unsigned int address)
{
unsigned char error;
SANITY_CHECK(pAt45);
SANITY_CHECK(pBuffer);
SANITY_CHECK(size <= pAt45->pDesc->pageSize);
// Issue a page write through buffer 1 command
error = AT45_SendCommand(pAt45, AT45_PAGE_WRITE_BUF1, 4, pBuffer, size, address, 0, 0);
ASSERT(!error, "-F- AT45_Write: Could not issue command.\n\r");
// Wait until the command is sent
while (AT45_IsBusy(pAt45)) {
AT45D_Wait(pAt45);
}
// Wait until the At45 becomes ready again
AT45D_WaitReady(pAt45);
}
//------------------------------------------------------------------------------
/// Erases a page of data at the given address in the At45.
/// \param pAt45 Pointer to a At45 driver instance.
/// \param address Address of page to erase.
//------------------------------------------------------------------------------
void AT45D_Erase(At45 *pAt45, unsigned int address)
{
unsigned char error;
SANITY_CHECK(pAt45);
// Issue a page erase command.
error = AT45_SendCommand(pAt45, AT45_PAGE_ERASE, 4, 0, 0, address, 0, 0);
ASSERT(!error, "-F- AT45_Erase: Could not issue command.\n\r");
// Wait for end of transfer
while (AT45_IsBusy(pAt45)) {
AT45D_Wait(pAt45);
}
// Poll until the At45 has completed the erase operation
AT45D_WaitReady(pAt45);
}
//------------------------------------------------------------------------------
/// Configure power-of-2 binary page size in the At45.
/// \param pAt45 Pointer to a At45 driver instance.
//------------------------------------------------------------------------------
void AT45D_BinaryPage(At45 *pAt45)
{
unsigned char error;
unsigned char opcode[3]= {AT45_BINARY_PAGE};
SANITY_CHECK(pAt45);
// Issue a binary page command.
error = AT45_SendCommand(pAt45, AT45_BINARY_PAGE_FIRST_OPCODE, 1, opcode, 3, 0, 0, 0);
ASSERT(!error, "-F- AT45_Erase: Could not issue command.\n\r");
// Wait for end of transfer
while (AT45_IsBusy(pAt45)) {
AT45D_Wait(pAt45);
}
// Wait until the At45 becomes ready again
AT45D_WaitReady(pAt45);
}
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