Mbed OS Reference | QSPI.h Source File

 /* mbed Microcontroller Library
  * Copyright (c) 2006-2018 ARM Limited
  * SPDX-License-Identifier: Apache-2.0
  *
  * 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_QSPI_H
 #define MBED_QSPI_H
 
 #include "platform/platform.h"
 
 #if DEVICE_QSPI || defined(DOXYGEN_ONLY)
 
 #include "hal/qspi_api.h"
 #include "platform/PlatformMutex.h"
 #include "platform/SingletonPtr.h"
 #include "platform/NonCopyable.h"
 
 #define ONE_MHZ     1000000
 
 #define QSPI_NO_INST (-1)
 
 namespace mbed {
 /** \defgroup drivers-public-api-spi SPI
  * \ingroup drivers-public-api
  */
 
 /**
  * \defgroup drivers_QSPI QSPI class
  * \ingroup drivers-public-api-spi
  * @{
  */
 
 /** Type representing a QSPI instruction
  */
 typedef int qspi_inst_t;
 
 /** A QSPI Driver, used for communicating with QSPI slave devices
  *
  * The default format is set to Quad-SPI(1-1-1), and a clock frequency of 1MHz
  * Most QSPI devices will also require Chip Select which is indicated by ssel.
  *
  * @note Synchronization level: Thread safe
  *
  * Example:
  * @code
  * // Write 4 byte array to a QSPI slave, and read the response, note that each device will have its specific read/write/alt values defined
  *
  * #include "mbed.h"
  *
  * #define CMD_WRITE 0x02
  * #define CMD_READ  0x03
  * #define ADDRESS   0x1000
  *
  * // hardware ssel (where applicable)
  * QSPI qspi_device(QSPI_FLASH1_IO0, QSPI_FLASH1_IO1, QSPI_FLASH1_IO2, QSPI_FLASH1_IO3, QSPI_FLASH1_SCK, QSPI_FLASH1_CSN); // io0, io1, io2, io3, sclk, ssel
  *
  *
  * int main() {
  *     char tx_buf[] = { 0x11, 0x22, 0x33, 0x44 };
  *     char rx_buf[4];
  *     int buf_len = sizeof(tx_buf);
  *
  *     qspi_status_t result = qspi_device.write(CMD_WRITE, 0, ADDRESS, tx_buf, &buf_len);
  *     if (result != QSPI_STATUS_OK) {
  *        printf("Write failed");
  *     }
  *     result = qspi_device.read(CMD_READ, 0, ADDRESS, rx_buf, &buf_len);
  *     if (result != QSPI_STATUS_OK) {
  *        printf("Read failed");
  *     }
  *
  * }
  * @endcode
  */
 class QSPI : private NonCopyable<QSPI> {
 
 public:
 
     /** Create a QSPI master connected to the specified pins
      *
      *  io0-io3 is used to specify the Pins used for Quad SPI mode
      *
      *  @param io0 1st IO pin used for sending/receiving data during data phase of a transaction
      *  @param io1 2nd IO pin used for sending/receiving data during data phase of a transaction
      *  @param io2 3rd IO pin used for sending/receiving data during data phase of a transaction
      *  @param io3 4th IO pin used for sending/receiving data during data phase of a transaction
      *  @param sclk QSPI Clock pin
      *  @param ssel QSPI chip select pin
      *  @param mode Clock polarity and phase mode (0 - 3) of SPI
      *         (Default: Mode=0 uses CPOL=0, CPHA=0, Mode=1 uses CPOL=1, CPHA=1)
      *
      */
     QSPI(PinName io0, PinName io1, PinName io2, PinName io3, PinName sclk, PinName ssel = NC, int mode = 0);
     virtual ~QSPI()
     {
     }
 
     /** Configure the data transmission format
      *
      *  @param inst_width Bus width used by instruction phase(Valid values are QSPI_CFG_BUS_SINGLE, QSPI_CFG_BUS_DUAL, QSPI_CFG_BUS_QUAD)
      *  @param address_width Bus width used by address phase(Valid values are QSPI_CFG_BUS_SINGLE, QSPI_CFG_BUS_DUAL, QSPI_CFG_BUS_QUAD)
      *  @param address_size Size in bits used by address phase(Valid values are QSPI_CFG_ADDR_SIZE_8, QSPI_CFG_ADDR_SIZE_16, QSPI_CFG_ADDR_SIZE_24, QSPI_CFG_ADDR_SIZE_32)
      *  @param alt_width Bus width used by alt phase(Valid values are QSPI_CFG_BUS_SINGLE, QSPI_CFG_BUS_DUAL, QSPI_CFG_BUS_QUAD)
      *  @param alt_size Size in bits used by alt phase (must be a multiple of the number of bus lines indicated in alt_width)
      *  @param data_width Bus width used by data phase(Valid values are QSPI_CFG_BUS_SINGLE, QSPI_CFG_BUS_DUAL, QSPI_CFG_BUS_QUAD)
      *  @param dummy_cycles Number of dummy clock cycles to be used after alt phase
      *
      */
     qspi_status_t configure_format(qspi_bus_width_t inst_width,
                                    qspi_bus_width_t address_width,
                                    qspi_address_size_t address_size,
                                    qspi_bus_width_t alt_width,
                                    qspi_alt_size_t alt_size,
                                    qspi_bus_width_t data_width,
                                    int dummy_cycles);
 
     /** Set the qspi bus clock frequency
      *
      *  @param hz SCLK frequency in hz (default = 1MHz)
      *  @returns
      *    Returns QSPI_STATUS_SUCCESS on successful, fails if the interface is already init-ed
      */
     qspi_status_t set_frequency(int hz = ONE_MHZ);
 
     /** Read from QSPI peripheral with the preset read_instruction and alt_value
      *
      *  @param address Address to be accessed in QSPI peripheral
      *  @param rx_buffer Buffer for data to be read from the peripheral
      *  @param rx_length Pointer to a variable containing the length of rx_buffer, and on return this variable will be updated with the actual number of bytes read
      *
      *  @returns
      *    Returns QSPI_STATUS_SUCCESS on successful reads and QSPI_STATUS_ERROR on failed reads.
      */
     qspi_status_t read(int address, char *rx_buffer, size_t *rx_length);
 
     /** Write to QSPI peripheral using custom write instruction
      *
      *  @param address Address to be accessed in QSPI peripheral
      *  @param tx_buffer Buffer containing data to be sent to peripheral
      *  @param tx_length Pointer to a variable containing the length of data to be transmitted, and on return this variable will be updated with the actual number of bytes written
      *
      *  @returns
      *    Returns QSPI_STATUS_SUCCESS on successful reads and QSPI_STATUS_ERROR on failed reads.
      */
     qspi_status_t write(int address, const char *tx_buffer, size_t *tx_length);
 
     /** Read from QSPI peripheral using custom read instruction, alt values
      *
      *  @param instruction Instruction value to be used in instruction phase. Use QSPI_NO_INST to skip the instruction phase
      *  @param alt Alt value to be used in Alternate-byte phase. Use -1 for ignoring Alternate-byte phase
      *  @param address Address to be accessed in QSPI peripheral
      *  @param rx_buffer Buffer for data to be read from the peripheral
      *  @param rx_length Pointer to a variable containing the length of rx_buffer, and on return this variable will be updated with the actual number of bytes read
      *
      *  @returns
      *    Returns QSPI_STATUS_SUCCESS on successful reads and QSPI_STATUS_ERROR on failed reads.
      */
     qspi_status_t read(qspi_inst_t instruction, int alt, int address, char *rx_buffer, size_t *rx_length);
 
     /** Write to QSPI peripheral using custom write instruction, alt values
      *
      *  @param instruction Instruction value to be used in instruction phase. Use QSPI_NO_INST to skip the instruction phase
      *  @param alt Alt value to be used in Alternate-byte phase. Use -1 for ignoring Alternate-byte phase
      *  @param address Address to be accessed in QSPI peripheral
      *  @param tx_buffer Buffer containing data to be sent to peripheral
      *  @param tx_length Pointer to a variable containing the length of data to be transmitted, and on return this variable will be updated with the actual number of bytes written
      *
      *  @returns
      *    Returns QSPI_STATUS_SUCCESS on successful reads and QSPI_STATUS_ERROR on failed reads.
      */
     qspi_status_t write(qspi_inst_t instruction, int alt, int address, const char *tx_buffer, size_t *tx_length);
 
     /** Perform a transaction to write to an address(a control register) and get the status results
      *
      *  @param instruction Instruction value to be used in instruction phase. Use QSPI_NO_INST to skip the instruction phase
      *  @param address Some instruction might require address. Use -1 if no address
      *  @param tx_buffer Buffer containing data to be sent to peripheral
      *  @param tx_length Pointer to a variable containing the length of data to be transmitted, and on return this variable will be updated with the actual number of bytes written
      *  @param rx_buffer Buffer for data to be read from the peripheral
      *  @param rx_length Pointer to a variable containing the length of rx_buffer, and on return this variable will be updated with the actual number of bytes read
      *
      *  @returns
      *    Returns QSPI_STATUS_SUCCESS on successful reads and QSPI_STATUS_ERROR on failed reads.
      */
     qspi_status_t command_transfer(qspi_inst_t instruction, int address, const char *tx_buffer, size_t tx_length, const char *rx_buffer, size_t rx_length);
 
 #if !defined(DOXYGEN_ONLY)
 protected:
     /** Acquire exclusive access to this SPI bus
      */
     virtual void lock(void);
 
     /** Release exclusive access to this SPI bus
      */
     virtual void unlock(void);
 
     qspi_t _qspi;
 
     bool acquire(void);
     static QSPI *_owner;
     static SingletonPtr<PlatformMutex> _mutex;
     qspi_bus_width_t _inst_width; //Bus width for Instruction phase
     qspi_bus_width_t _address_width; //Bus width for Address phase
     qspi_address_size_t _address_size;
     qspi_bus_width_t _alt_width; //Bus width for Alt phase
     qspi_alt_size_t _alt_size;
     qspi_bus_width_t _data_width; //Bus width for Data phase
     qspi_command_t _qspi_command; //QSPI Hal command struct
     unsigned int _num_dummy_cycles; //Number of dummy cycles to be used
     int _hz; //Bus Frequency
     int _mode; //SPI mode
     bool _initialized;
     PinName _qspi_io0, _qspi_io1, _qspi_io2, _qspi_io3, _qspi_clk, _qspi_cs; //IO lines, clock and chip select
 
 private:
     /* Private acquire function without locking/unlocking
      * Implemented in order to avoid duplicate locking and boost performance
      */
     bool _acquire(void);
     bool _initialize();
 
     /*
      * This function builds the qspi command struct to be send to Hal
      */
     inline void _build_qspi_command(qspi_inst_t instruction, int address, int alt);
 #endif
 };
 
 /** @}*/
 
 } // namespace mbed
 
 #endif
 
 #endif
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