Mbed OS Reference | SPIFBlockDevice.h Source File

 /* mbed Microcontroller Library
  * Copyright (c) 2018 ARM Limited
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #ifndef MBED_SPIF_BLOCK_DEVICE_H
 #define MBED_SPIF_BLOCK_DEVICE_H
 
 #include "platform/SingletonPtr.h"
 #include "SPI.h"
 #include "DigitalOut.h"
 #include "BlockDevice.h"
 
 /** Enum spif standard error codes
  *
  *  @enum spif_bd_error
  */
 enum spif_bd_error {
     SPIF_BD_ERROR_OK                    = 0,     /*!< no error */
     SPIF_BD_ERROR_DEVICE_ERROR          = BD_ERROR_DEVICE_ERROR, /*!< device specific error -4001 */
     SPIF_BD_ERROR_PARSING_FAILED        = -4002, /* SFDP Parsing failed */
     SPIF_BD_ERROR_READY_FAILED          = -4003, /* Wait for Memory Ready failed */
     SPIF_BD_ERROR_WREN_FAILED           = -4004, /* Write Enable Failed */
     SPIF_BD_ERROR_INVALID_ERASE_PARAMS  = -4005, /* Erase command not on sector aligned addresses or exceeds device size */
 };
 
 
 #define SPIF_MAX_REGIONS    10
 #define MAX_NUM_OF_ERASE_TYPES 4
 
 /** BlockDevice for SFDP based flash devices over SPI bus
  *
  *  @code
  *  // An example using SPI flash device on K82F target
  *  #include "mbed.h"
  *  #include "SPIFBlockDevice.h"
  *
  *  // Create flash device on SPI bus with PTE5 as chip select
  *  SPIFBlockDevice spif(PTE2, PTE4, PTE1, PTE5);
  *
  *  int main() {
  *      printf("spif test\n");
  *
  *      // Initialize the SPI flash device and print the memory layout
  *      spif.init();
  *      printf("spif size: %llu\n",         spif.size());
  *      printf("spif read size: %llu\n",    spif.get_read_size());
  *      printf("spif program size: %llu\n", spif.get_program_size());
  *      printf("spif erase size: %llu\n",   spif.get_erase_size());
  *
  *      // Write "Hello World!" to the first block
  *      char *buffer = (char*)malloc(spif.get_erase_size());
  *      sprintf(buffer, "Hello World!\n");
  *      spif.erase(0, spif.get_erase_size());
  *      spif.program(buffer, 0, spif.get_erase_size());
  *
  *      // Read back what was stored
  *      spif.read(buffer, 0, spif.get_erase_size());
  *      printf("%s", buffer);
  *
  *      // Deinitialize the device
  *      spif.deinit();
  *  }
  *  @endcode
  */
 class SPIFBlockDevice : public mbed::BlockDevice {
 public:
     /** Creates a SPIFBlockDevice on a SPI bus specified by pins
      *
      *  @param mosi     SPI master out, slave in pin
      *  @param miso     SPI master in, slave out pin
      *  @param sclk     SPI clock pin
      *  @param csel     SPI chip select pin
      *  @param freq     Clock speed of the SPI bus (defaults to 40MHz)
      */
     SPIFBlockDevice(PinName mosi, PinName miso, PinName sclk, PinName csel, int freq = 40000000);
 
     /** Initialize a block device
      *
      *  @return         SPIF_BD_ERROR_OK(0) - success
      *                  SPIF_BD_ERROR_DEVICE_ERROR - device driver transaction failed
      *                  SPIF_BD_ERROR_READY_FAILED - Waiting for Memory ready failed or timed out
      *                  SPIF_BD_ERROR_PARSING_FAILED - unexpected format or values in one of the SFDP tables
      */
     virtual int init();
 
     /** Deinitialize a block device
      *
      *  @return         SPIF_BD_ERROR_OK(0) - success
      */
     virtual int deinit();
 
     /** Desctruct SPIFBlockDevice
       */
     ~SPIFBlockDevice()
     {
         deinit();
     }
 
     /** Read blocks from a block device
      *
      *  @param buffer   Buffer to write blocks to
      *  @param addr     Address of block to begin reading from
      *  @param size     Size to read in bytes, must be a multiple of read block size
      *  @return         SPIF_BD_ERROR_OK(0) - success
      *                  SPIF_BD_ERROR_DEVICE_ERROR - device driver transaction failed
      */
     virtual int read(void *buffer, mbed::bd_addr_t addr, mbed::bd_size_t size);
 
     /** Program blocks to a block device
      *
      *  @note The blocks must have been erased prior to being programmed
      *
      *  @param buffer   Buffer of data to write to blocks
      *  @param addr     Address of block to begin writing to
      *  @param size     Size to write in bytes, must be a multiple of program block size
      *  @return         SPIF_BD_ERROR_OK(0) - success
      *                  SPIF_BD_ERROR_DEVICE_ERROR - device driver transaction failed
      *                  SPIF_BD_ERROR_READY_FAILED - Waiting for Memory ready failed or timed out
      *                  SPIF_BD_ERROR_WREN_FAILED - Write Enable failed
      */
     virtual int program(const void *buffer, mbed::bd_addr_t addr, mbed::bd_size_t size);
 
     /** Erase blocks on a block device
      *
      *  @note The state of an erased block is undefined until it has been programmed
      *
      *  @param addr     Address of block to begin erasing
      *  @param size     Size to erase in bytes, must be a multiple of erase block size
      *  @return         SPIF_BD_ERROR_OK(0) - success
      *                  SPIF_BD_ERROR_DEVICE_ERROR - device driver transaction failed
      *                  SPIF_BD_ERROR_READY_FAILED - Waiting for Memory ready failed or timed out
      *                  SPIF_BD_ERROR_INVALID_ERASE_PARAMS - Trying to erase unaligned address or size
      */
     virtual int erase(mbed::bd_addr_t addr, mbed::bd_size_t size);
 
     /** Get the size of a readable block
      *
      *  @return         Size of a readable block in bytes
      */
     virtual mbed::bd_size_t get_read_size() const;
 
     /** Get the size of a programable block
      *
      *  @return         Size of a programable block in bytes
      *  @note Must be a multiple of the read size
      */
     virtual mbed::bd_size_t get_program_size() const;
 
     /** Get the size of an erasable block
      *
      *  @return         Size of an erasable block in bytes
      *  @note Must be a multiple of the program size
      */
     virtual mbed::bd_size_t get_erase_size() const;
 
     /** Get the size of minimal erasable sector size of given address
      *
      *  @param addr     Any address within block queried for erase sector size (can be any address within flash size offset)
      *  @return         Size of minimal erase sector size, in given address region, in bytes
      *  @note Must be a multiple of the program size
      */
     virtual mbed::bd_size_t get_erase_size(mbed::bd_addr_t addr) const;
 
     /** Get the value of storage byte after it was erased
      *
      *  If get_erase_value returns a non-negative byte value, the underlying
      *  storage is set to that value when erased, and storage containing
      *  that value can be programmed without another erase.
      *
      *  @return         The value of storage when erased, or -1 if you can't
      *                  rely on the value of erased storage
      */
     virtual int get_erase_value() const;
 
     /** Get the total size of the underlying device
      *
      *  @return         Size of the underlying device in bytes
      */
     virtual mbed::bd_size_t size() const;
 
     /** Get the BlockDevice class type.
      *
      *  @return         A string representation of the BlockDevice class type.
      */
     virtual const char *get_type() const;
 
 private:
 
     // Internal functions
 
     /****************************************/
     /* SFDP Detection and Parsing Functions */
     /****************************************/
     // Parse SFDP Headers and retrieve Basic Param and Sector Map Tables (if exist)
     int _sfdp_parse_sfdp_headers(uint32_t &basic_table_addr, size_t &basic_table_size,
                                  uint32_t &sector_map_table_addr, size_t &sector_map_table_size);
 
     // Parse and Detect required Basic Parameters from Table
     int _sfdp_parse_basic_param_table(uint32_t basic_table_addr, size_t basic_table_size);
 
     // Parse and read information required by Regions Sector Map
     int _sfdp_parse_sector_map_table(uint32_t sector_map_table_addr, size_t sector_map_table_size);
 
     // Detect fastest read Bus mode supported by device
     int _sfdp_detect_best_bus_read_mode(uint8_t *basic_param_table_ptr, int basic_param_table_size, int &read_inst);
 
     // Set Page size for program
     unsigned int _sfdp_detect_page_size(uint8_t *basic_param_table_ptr, int basic_param_table_size);
 
     // Detect all supported erase types
     int _sfdp_detect_erase_types_inst_and_size(uint8_t *basic_param_table_ptr, int basic_param_table_size,
                                                int &erase4k_inst,
                                                int *erase_type_inst_arr, unsigned int *erase_type_size_arr);
 
     /***********************/
     /* Utilities Functions */
     /***********************/
     // Find the region to which the given offset belongs to
     int _utils_find_addr_region(bd_size_t offset) const;
 
     // Iterate on all supported Erase Types of the Region to which the offset belongs to.
     // Iterates from highest type to lowest
     int _utils_iterate_next_largest_erase_type(uint8_t &bitfield, int size, int offset, int boundry);
 
     /********************************/
     /*   Calls to SPI Driver APIs   */
     /********************************/
     // Send Program => Write command to Driver
     spif_bd_error _spi_send_program_command(int prog_inst, const void *buffer, mbed::bd_addr_t addr, mbed::bd_size_t size);
 
     // Send Read command to Driver
     //spif_bd_error _spi_send_read_command(uint8_t read_inst, void *buffer, bd_addr_t addr, bd_size_t size);
     spif_bd_error _spi_send_read_command(int read_inst, uint8_t *buffer, mbed::bd_addr_t addr, mbed::bd_size_t size);
 
     // Send Erase Instruction using command_transfer command to Driver
     spif_bd_error _spi_send_erase_command(int erase_inst, mbed::bd_addr_t addr, mbed::bd_size_t size);
 
     // Send Generic command_transfer command to Driver
     spif_bd_error _spi_send_general_command(int instruction, mbed::bd_addr_t addr, char *tx_buffer,
                                             size_t tx_length, char *rx_buffer, size_t rx_length);
 
     // Send set_frequency command to Driver
     spif_bd_error _spi_set_frequency(int freq);
     /********************************/
 
     // Soft Reset Flash Memory
     int _reset_flash_mem();
 
     // Configure Write Enable in Status Register
     int _set_write_enable();
 
     // Wait on status register until write not-in-progress
     bool _is_mem_ready();
 
 private:
     // Master side hardware
     mbed::SPI _spi;
     // Enable CS control (low/high) for SPI driver operations
     mbed::DigitalOut _cs;
 
     // Mutex is used to protect Flash device for some SPI Driver commands that must be done sequentially with no other commands in between
     // e.g. (1)Set Write Enable, (2)Program, (3)Wait Memory Ready
     static SingletonPtr<PlatformMutex> _mutex;
 
     // Command Instructions
     int _read_instruction;
     int _prog_instruction;
     int _erase_instruction;
     int _erase4k_inst;  // Legacy 4K erase instruction (default 0x20h)
 
     // Up To 4 Erase Types are supported by SFDP (each with its own command Instruction and Size)
     int _erase_type_inst_arr[MAX_NUM_OF_ERASE_TYPES];
     unsigned int _erase_type_size_arr[MAX_NUM_OF_ERASE_TYPES];
 
     // Sector Regions Map
     int _regions_count; //number of regions
     int _region_size_bytes[SPIF_MAX_REGIONS]; //regions size in bytes
     bd_size_t _region_high_boundary[SPIF_MAX_REGIONS]; //region high address offset boundary
     //Each Region can support a bit combination of any of the 4 Erase Types
     uint8_t _region_erase_types_bitfield[SPIF_MAX_REGIONS];
     unsigned int _min_common_erase_size; // minimal common erase size for all regions (0 if none exists)
 
     unsigned int _page_size_bytes; // Page size - 256 Bytes default
     bd_size_t _device_size_bytes;
 
     // Bus configuration
     unsigned int _address_size; // number of bytes for address
     unsigned int _read_dummy_and_mode_cycles; // Number of Dummy and Mode Bits required by Read Bus Mode
     unsigned int _write_dummy_and_mode_cycles; // Number of Dummy and Mode Bits required by Write Bus Mode
     unsigned int _dummy_and_mode_cycles; // Number of Dummy and Mode Bits required by Current Bus Mode
     uint32_t _init_ref_count;
     bool _is_initialized;
 };
 
 #endif  /* MBED_SPIF_BLOCK_DEVICE_H */
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