main.c
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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.
- * ----------------------------------------------------------------------------
- */
- //------------------------------------------------------------------------------
- /// dir "Basic-serialflash-project"
- ///
- /// !!!Purpose
- ///
- /// The Basic Serialflash project will help new users get familiar with SPI interface
- /// on Atmel's AT91 family of microcontrollers. This project gives you an AT26
- /// serial firmware dataflash programming code so that can help develop your own
- /// SPI devices applications with maximum efficiency.
- ///
- /// You can find following information depends on your needs:
- /// - A Spi low level driver performs SPI device Initializes, data transfer and
- /// receive. It can be used by upper SPI driver such as AT26 %dataflash.
- /// - A Dataflash driver is based on top of the corresponding Spi driver.
- /// It allow user to do operations with %dataflash in a unified way.
- ///
- /// !See also
- /// - "spi-flash": Dataflash interface driver.
- ///
- /// !!!Requirements
- ///
- /// This package can be used with all Atmel evaluation kits that have SPI
- /// interface and on-board or external Dataflash connected. The package runs at
- /// SRAM or SDRAM, so SDRAM device is needed if you want to run this package in SDRAM.
- ///
- ///
- /// !!!Description
- ///
- /// The demonstration program tests the dataflash present on the evaluation kit by
- /// erasing and writing each one of its pages.
- ///
- /// !!!Usage
- ///
- /// -# Build the program and download it inside the evaluation board. Please
- /// refer to the <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6224.pdf">SAM-BA User Guide</a>,
- /// the <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6310.pdf">GNU-Based Software Development</a>
- /// application note or to the <a href="ftp://ftp.iar.se/WWWfiles/arm/Guides/EWARM_UserGuide.ENU.pdf">IAR EWARM User Guide</a>,
- /// depending on your chosen solution.
- /// -# On the computer, open and configure a terminal application
- /// (e.g. HyperTerminal on Microsoft Windows) with these settings:
- /// - 115200 bauds
- /// - 8 bits of data
- /// - No parity
- /// - 1 stop bit
- /// - No flow control
- /// -# Start the application.
- /// -# Upon startup, the application will output the following lines on the DBGU:
- /// code
- /// -- Basic Serial Firmware Dataflash Project xxx --
- /// -- AT91xxxxxx-xx
- /// -- Compiled: xxx xx xxxx xx:xx:xx --
- /// -I- SPI and At26 initialized
- /// endcode
- /// -# The program will connect to the serial firmware dataflash through the SPI
- /// and start sending commands to it. It will perform the following:
- /// - Read the JEDEC identifier of the device to autodetect it
- /// The next line should indicate if the serial dataflash has been
- /// correctly identified. For example, this is what appears when an
- /// AT26DF321 chip is recognized:
- /// code
- /// -I- AT26DF321 Serial Flash detected
- /// endcode
- /// - Erase the chip
- /// - Check that each page is blank
- /// - Write a "Walking one" pattern on each page:
- /// code
- /// Byte 0 = 00000001
- /// Byte 1 = 00000010
- /// Byte 2 = 00000100
- /// ........
- /// endcode
- /// - Verify that the pattern has been correctly applied on each page
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- /// unit
- ///
- /// !Purpose
- ///
- /// This file contains all the specific code for the basic-serialflash-project.
- /// It tests the serial firmware dataflash present on the evaluation kit by
- /// erasing and writing each one of its pages.
- ///
- /// !Contents
- /// The code can be roughly broken down as follows:
- /// - AT26 Dataflash write data function.
- /// - AT26 Dataflash read data function.
- /// - AT26 Dataflash erase function.
- /// - Other AT26 functions (such as AT26_GetStatus())
- /// - The main() function, which implements the program behavior.
- /// - Initializes an AT26 instance and configures SPI chip select pin.
- /// - Config SPI Interrupt Service Routine.
- /// - Identifier the AT26 device connected to the evaluation kit.
- /// - Test the dataflash by erasing and writing each one of its pages.
- ///
- /// !See also
- /// - "spi-flash": SPI Dataflash interface driver.
- ///
- /// Please refer to the list of functions in the #Overview# tab of this unit
- /// for more detailed information.
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- // Headers
- //------------------------------------------------------------------------------
- #include <board.h>
- #include <dbgu/dbgu.h>
- #include <pio/pio.h>
- #include <aic/aic.h>
- #include <utility/assert.h>
- #include <utility/trace.h>
- #include <utility/math.h>
- #include <memories/spi-flash/at26.h>
- #include <string.h>
- //------------------------------------------------------------------------------
- // Internal definitions
- //------------------------------------------------------------------------------
- /// Maximum device page size in bytes.
- #define MAXPAGESIZE 256
- #if defined(BOARD_AT45_A_SPI_BASE)
- /// Address of the SPI peripheral connected to the AT26.
- #define SPI_BASE BOARD_AT45_A_SPI_BASE
- /// Peripheral identifier of the SPI connected to the AT26.
- #define SPI_ID BOARD_AT45_A_SPI_ID
- /// Chip select value used to select the AT26 chip.
- #define SPI_CS BOARD_AT45_A_NPCS
- /// SPI peripheral pins to configure to access the serial flash.
- #define SPI_PINS BOARD_AT45_A_SPI_PINS, BOARD_AT45_A_NPCS_PIN
- #elif defined(AT91C_BASE_SPI0)
- /// Address of the SPI peripheral connected to the AT26.
- #define SPI_BASE AT91C_BASE_SPI0
- /// Peripheral identifier of the SPI connected to the AT26.
- #define SPI_ID AT91C_ID_SPI0
- /// Chip select value used to select the AT26 chip.
- #define SPI_CS 0
- /// SPI peripheral pins to configure to access the serial flash.
- #define SPI_PINS PINS_SPI0, PIN_SPI0_NPCS0
- #else
- /// Address of the SPI peripheral connected to the AT26.
- #define SPI_BASE AT91C_BASE_SPI
- /// Peripheral identifier of the SPI connected to the AT26.
- #define SPI_ID AT91C_ID_SPI
- /// Chip select value used to select the AT26 chip.
- #define SPI_CS 0
- /// SPI peripheral pins to configure to access the serial flash.
- #define SPI_PINS PINS_SPI, PIN_SPI_NPCS0
- #endif //#if defined(AT91C_BASE_SPI0)
- //------------------------------------------------------------------------------
- // Internal variables
- //------------------------------------------------------------------------------
- /// SPI driver instance.
- static Spid spid;
- /// Serial flash driver instance.
- static At26 at26;
- /// Pins to configure for the application.
- static Pin pins[] = {SPI_PINS};
- //------------------------------------------------------------------------------
- // Internal functions
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- /// Interrupt service routine for the SPI peripheral. Forwards the interrupt
- /// to the SPI driver.
- //------------------------------------------------------------------------------
- static void ISR_Spi(void)
- {
- SPID_Handler(&spid);
- }
- //------------------------------------------------------------------------------
- /// Reads and returns the status register of the serial flash.
- /// param pAt26 Pointer to an AT26 driver instance.
- //------------------------------------------------------------------------------
- static unsigned char AT26_ReadStatus(At26 *pAt26)
- {
- unsigned char error, status;
- SANITY_CHECK(pAt26);
- // Issue a status read command
- error = AT26_SendCommand(pAt26, AT26_READ_STATUS, 1, &status, 1, 0, 0, 0);
- ASSERT(!error, "-F- AT26_GetStatus: Failed to issue command.nr");
- // Wait for transfer to finish
- while (AT26_IsBusy(pAt26));
- return status;
- }
- //------------------------------------------------------------------------------
- /// Writes the given value in the status register of the serial flash device.
- /// param pAt26 Pointer to an AT26 driver instance.
- /// param status Status to write.
- //------------------------------------------------------------------------------
- static void AT26_WriteStatus(At26 *pAt26, unsigned char status)
- {
- unsigned char error;
- SANITY_CHECK(pAt26);
- // Issue a write status command
- error = AT26_SendCommand(pAt26, AT26_WRITE_STATUS, 1, &status, 1, 0, 0, 0);
- ASSERT(!error, "-F- AT26_WriteStatus: Failed to issue command.nr");
- while (AT26_IsBusy(pAt26));
- }
- //------------------------------------------------------------------------------
- /// Waits for the serial flash device to become ready to accept new commands.
- /// param pAt26 Pointer to an AT26 driver instance.
- //------------------------------------------------------------------------------
- static void AT26_WaitReady(At26 *pAt26)
- {
- unsigned char ready = 0;
- SANITY_CHECK(pAt26);
- // Read status register and check busy bit
- while (!ready) {
- ready = ((AT26_ReadStatus(pAt26) & AT26_STATUS_RDYBSY) == AT26_STATUS_RDYBSY_READY);
- }
- }
- //------------------------------------------------------------------------------
- /// Reads and returns the serial flash device ID.
- /// param pAt26 Pointer to an AT26 driver instance.
- //------------------------------------------------------------------------------
- static unsigned int AT26_ReadJedecId(At26 *pAt26)
- {
- unsigned char error;
- unsigned int id = 0;
- SANITY_CHECK(pAt26);
-
- // Issue a read ID command
- error = AT26_SendCommand(pAt26, AT26_READ_JEDEC_ID, 1,
- (unsigned char *) &id, 3, 0, 0, 0);
- ASSERT(!error, "-F- AT26_GetJedecId: Could not issue command.nr");
- // Wait for transfer to finish
- while (AT26_IsBusy(pAt26));
- return id;
- }
- //------------------------------------------------------------------------------
- /// Enables critical writes operation on a serial flash device, such as sector
- /// protection, status register, etc.
- /// para pAt26 Pointer to an AT26 driver instance.
- //------------------------------------------------------------------------------
- static void AT26_EnableWrite(At26 *pAt26)
- {
- unsigned char error;
- SANITY_CHECK(pAt26);
- // Issue a write enable command
- error = AT26_SendCommand(pAt26, AT26_WRITE_ENABLE, 1, 0, 0, 0, 0, 0);
- ASSERT(!error, "-F- AT26_EnableWrite: Could not issue command.nr");
- // Wait for end of transfer
- while (AT26_IsBusy(pAt26));
- }
- //------------------------------------------------------------------------------
- /// Unprotects the contents of the serial flash device.
- /// Returns 0 if the device has been unprotected; otherwise returns
- /// SF_PROTECTED.
- /// param pAt26 Pointer to an AT26 driver instance.
- //------------------------------------------------------------------------------
- static unsigned char AT26_Unprotect(At26 *pAt26)
- {
- unsigned char status;
- SANITY_CHECK(pAt26);
- // Get the status register value to check the current protection
- status = AT26_ReadStatus(pAt26);
- if ((status & AT26_STATUS_SWP) == AT26_STATUS_SWP_PROTNONE) {
- // Protection already disabled
- return 0;
- }
-
- // Check if sector protection registers are locked
- if ((status & AT26_STATUS_SPRL) == AT26_STATUS_SPRL_LOCKED) {
- // Unprotect sector protection registers by writing the status reg.
- AT26_EnableWrite(pAt26);
- AT26_WriteStatus(pAt26, 0);
- }
-
- // Perform a global unprotect command
- AT26_EnableWrite(pAt26);
- AT26_WriteStatus(pAt26, 0);
-
- // Check the new status
- if ((status & (AT26_STATUS_SPRL | AT26_STATUS_SWP)) != 0) {
- return AT26_ERROR_PROTECTED;
- }
- else {
- return 0;
- }
- }
- //------------------------------------------------------------------------------
- /// Erases all the content of the memory chip.
- /// param pAt26 Pointer to an AT26 driver instance.
- //------------------------------------------------------------------------------
- static unsigned char AT26_EraseChip(At26 *pAt26)
- {
- unsigned char status;
- unsigned char error;
- SANITY_CHECK(pAt26);
- // Check that the flash is ready an unprotected
- status = AT26_ReadStatus(pAt26);
- if ((status & AT26_STATUS_SWP) != AT26_STATUS_SWP_PROTNONE) {
- TRACE_WARNING("AT26_EraseBlock: Device is protected.nr");
- return AT26_ERROR_PROTECTED;
- }
-
- // Enable critical write operation
- AT26_EnableWrite(pAt26);
-
- // Erase the chip
- error = AT26_SendCommand(pAt26, AT26_CHIP_ERASE_2, 1, 0, 0, 0, 0, 0);
- ASSERT(!error, "-F- AT26_ChipErase: Could not issue command.nr");
- while (AT26_IsBusy(pAt26));
- AT26_WaitReady(pAt26);
- return 0;
- }
- //------------------------------------------------------------------------------
- /// Erases the specified 4KB block of the serial firmware dataflash.
- /// Returns 0 if successful; otherwise returns AT26_ERROR_PROTECTED if the
- /// device is protected or AT26_ERROR_BUSY if it is busy executing a command.
- /// param pAt26 Pointer to an AT26 driver instance.
- /// param address Address of the block to erase.
- //------------------------------------------------------------------------------
- static unsigned char AT26_EraseBlock(At26 *pAt26, unsigned int address)
- {
- unsigned char status;
- unsigned char error;
- SANITY_CHECK(pAt26);
-
- // Check that the flash is ready an unprotected
- status = AT26_ReadStatus(pAt26);
- if ((status & AT26_STATUS_RDYBSY) != AT26_STATUS_RDYBSY_BUSY) {
- TRACE_WARNING("AT26_EraseBlock: Device is not ready.nr");
- return AT26_ERROR_BUSY;
- }
- else if ((status & AT26_STATUS_SWP) != AT26_STATUS_SWP_PROTNONE) {
- TRACE_WARNING("AT26_EraseBlock: Device is protected.nr");
- return AT26_ERROR_PROTECTED;
- }
- // Enable critical write operation
- AT26_EnableWrite(pAt26);
- // Start the block erase command
- error = AT26_SendCommand(pAt26, AT26_BLOCK_ERASE_4K, 4, 0, 0, address, 0, 0);
- ASSERT(!error, "-F- AT26_EraseBlock: Could not issue command.nr");
- while (AT26_IsBusy(pAt26));
- AT26_WaitReady(pAt26);
- return 0;
- }
- //------------------------------------------------------------------------------
- /// Writes data at the specified address on the serial firmware dataflash. The
- /// page(s) to program must have been erased prior to writing. This function
- /// handles page boundary crossing automatically.
- /// Returns 0 if successful; otherwise, returns AT26_ERROR_PROGRAM is there has
- /// been an error during the data programming.
- /// param pAt26 Pointer to an AT26 driver instance.
- /// param pData Data buffer.
- /// param size Number of bytes in buffer.
- /// param address Write address.
- //------------------------------------------------------------------------------
- static unsigned char AT26_Write(
- At26 *pAt26,
- unsigned char *pData,
- unsigned int size,
- unsigned int address)
- {
- unsigned int pageSize;
- unsigned int writeSize;
- unsigned char error;
- unsigned char status;
- SANITY_CHECK(pAt26);
- SANITY_CHECK(pData);
- // Retrieve device page size
- pageSize = AT26_PageSize(&at26);
- // Program one page after the other
- while (size > 0) {
- // Compute number of bytes to program in page
- writeSize = min(size, pageSize - (address % pageSize));
-
- // Enable critical write operation
- AT26_EnableWrite(pAt26);
-
- // Program page
- error = AT26_SendCommand(pAt26, AT26_BYTE_PAGE_PROGRAM, 4,
- pData, writeSize, address, 0, 0);
- ASSERT(!error, "-F- AT26_WritePage: Failed to issue command.nr");
- while (AT26_IsBusy(pAt26));
- AT26_WaitReady(pAt26);
- // Make sure that write was without error
- status = AT26_ReadStatus(pAt26);
- if ((status & AT26_STATUS_EPE) == AT26_STATUS_EPE_ERROR) {
- return AT26_ERROR_PROGRAM;
- }
-
- size -= writeSize;
- address += writeSize;
- }
- return 0;
- }
- //------------------------------------------------------------------------------
- /// Reads data from the specified address on the serial flash.
- /// param pAt26 Pointer to an AT26 driver instance.
- /// param pData Data buffer.
- /// param size Number of bytes to read.
- /// param address Read address.
- //------------------------------------------------------------------------------
- static void AT26_Read(
- At26 *pAt26,
- unsigned char *pData,
- unsigned int size,
- unsigned int address)
- {
- unsigned char error;
-
- // Start a read operation
- error = AT26_SendCommand(pAt26, AT26_READ_ARRAY_LF, 4, pData, size, address, 0, 0);
- ASSERT(!error, "-F- AT26_Read: Could not issue command.nr");
- while (AT26_IsBusy(pAt26));
- }
- //------------------------------------------------------------------------------
- // External functions
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- /// Initializes the serial flash and performs several tests on it.
- //------------------------------------------------------------------------------
- int main(void)
- {
- unsigned int jedecId;
- unsigned int numPages;
- unsigned int pageSize;
- unsigned int i, j;
- unsigned int address;
- unsigned char pBuffer[MAXPAGESIZE];
- // Configure the DBGU
- TRACE_CONFIGURE(DBGU_STANDARD, 115200, BOARD_MCK);
- printf("-- Basic Serial Firmware Dataflash Project %s --nr", SOFTPACK_VERSION);
- printf("-- %snr", BOARD_NAME);
- printf("-- Compiled: %s %s --nr", __DATE__, __TIME__);
- // Initialize the SPI and serial flash
- PIO_Configure(pins, PIO_LISTSIZE(pins));
- AIC_ConfigureIT(SPI_ID, 0, ISR_Spi);
- SPID_Configure(&spid, SPI_BASE, SPI_ID);
- AT26_Configure(&at26, &spid, SPI_CS);
- AIC_EnableIT(SPI_ID);
- TRACE_INFO("SPI and AT26 drivers initializednr");
-
- // Read the JEDEC ID of the device to identify it
- jedecId = AT26_ReadJedecId(&at26);
- if (AT26_FindDevice(&at26, jedecId)) {
- TRACE_INFO("%s serial flash detectednr", AT26_Name(&at26));
- }
- else {
- TRACE_ERROR("Failed to recognize the device (JEDEC ID is 0x%08X).nr", jedecId);
- return 1;
- }
- ASSERT(MAXPAGESIZE >= AT26_PageSize(&at26), "-F- MAXPAGESIZE too smallnr");
- // Get device parameters
- numPages = AT26_PageNumber(&at26);
- pageSize = AT26_PageSize(&at26);
- // Unprotected the flash
- AT26_Unprotect(&at26);
- TRACE_INFO("Flash unprotectednr");
- // Erase the chip
- TRACE_INFO("Chip is being erased...nr");
- AT26_EraseChip(&at26);
- TRACE_INFO("Checking erase ...nr");
- // Check that the chip has been erased correctly
- address = 0;
- for (i=0; i < numPages; i++) {
- TRACE_INFO("Checking page #%ur", i);
- AT26_Read(&at26, pBuffer, pageSize, address);
- for (j=0; j < pageSize; j++) {
- if (pBuffer[j] != 0xFF) {
- TRACE_ERROR("Failed erase on page%u:byte%unr", i, j);
- TRACE_ERROR(
- "-E- Expected 0xFF, read 0x%02Xnr",
- pBuffer[j]);
- return 2;
- }
- }
- address += pageSize;
- }
- TRACE_INFO("Erase successful.nr");
- // Program a "walking one" pattern on each page
- TRACE_INFO("Programming a walking 1 on all pages ...nr");
- address = 0;
- for (i=0; i < numPages; i++) {
- TRACE_INFO("Programming page #%ur", i);
- // Fill buffer
- for (j=0; j < pageSize; j++) {
- pBuffer[j] = 1 << (j & 0x7);
- }
- // Write buffer
- AT26_Write(&at26, pBuffer, pageSize, address);
- // Read page back and check result
- memset(pBuffer, 0, pageSize);
- AT26_Read(&at26, pBuffer, pageSize, address);
- for (j=0; j < pageSize; j++) {
- if (pBuffer[j] != (1 << (j & 0x7))) {
- TRACE_ERROR("Failed program on page%u:byte%unr", i, j);
- TRACE_ERROR(
- "-E- Expected 0x%02X, read 0x%02Xnr",
- 1 << (j & 0x7),
- pBuffer[j]);
- return 3;
- }
- }
- address += pageSize;
- }
- TRACE_INFO("Walking 1 test successful.nr");
- return 0;
- }