Diff: drivers/QSPI.h

Revision:

188:bcfe06ba3d64

Child:

189:f392fc9709a3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/QSPI.h	Thu Nov 08 11:46:34 2018 +0000
@@ -0,0 +1,231 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2018 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_QSPI_H
+#define MBED_QSPI_H
+
+#include "platform/platform.h"
+
+#if defined (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
+
+namespace mbed {
+
+/** \addtogroup drivers */
+
+/** 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
+ * @ingroup drivers
+ */
+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(Valid values are QSPI_CFG_ALT_SIZE_8, QSPI_CFG_ALT_SIZE_16, QSPI_CFG_ALT_SIZE_24, QSPI_CFG_ALT_SIZE_32)
+     *  @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
+     *  @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(int 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
+     *  @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(int 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
+     *  @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(int 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(int instruction, int address, int alt);
+#endif
+};
+
+} // namespace mbed
+
+#endif
+
+#endif