Diff: api/SPI.h

Revision:

144:ef7eb2e8f9f7

Parent:

0:9b334a45a8ff

--- a/api/SPI.h	Tue Aug 02 14:07:36 2016 +0000
+++ b/api/SPI.h	Fri Sep 02 15:07:44 2016 +0100
@@ -1,245 +1,261 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2015 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_SPI_H
-#define MBED_SPI_H
-
-#include "platform.h"
-
-#if DEVICE_SPI
-
-#include "spi_api.h"
-
-#if DEVICE_SPI_ASYNCH
-#include "CThunk.h"
-#include "dma_api.h"
-#include "CircularBuffer.h"
-#include "FunctionPointer.h"
-#include "Transaction.h"
-#endif
-
-namespace mbed {
-
-/** A SPI Master, used for communicating with SPI slave devices
- *
- * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
- *
- * Most SPI devices will also require Chip Select and Reset signals. These
- * can be controlled using <DigitalOut> pins
- *
- * Example:
- * @code
- * // Send a byte to a SPI slave, and record the response
- *
- * #include "mbed.h"
- *
- * // hardware ssel (where applicable)
- * //SPI device(p5, p6, p7, p8); // mosi, miso, sclk, ssel
- *
- * // software ssel
- * SPI device(p5, p6, p7); // mosi, miso, sclk
- * DigitalOut cs(p8); // ssel
- *
- * int main() {
- *     // hardware ssel (where applicable)
- *     //int response = device.write(0xFF);
- *
- *     // software ssel
- *     cs = 0;
- *     int response = device.write(0xFF);
- *     cs = 1;
- * }
- * @endcode
- */
-class SPI {
-
-public:
-
-    /** Create a SPI master connected to the specified pins
-     *
-     *  mosi or miso can be specfied as NC if not used
-     *
-     *  @param mosi SPI Master Out, Slave In pin
-     *  @param miso SPI Master In, Slave Out pin
-     *  @param sclk SPI Clock pin
-     *  @param ssel SPI chip select pin
-     */
-    SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel=NC);
-
-    /** Configure the data transmission format
-     *
-     *  @param bits Number of bits per SPI frame (4 - 16)
-     *  @param mode Clock polarity and phase mode (0 - 3)
-     *
-     * @code
-     * mode | POL PHA
-     * -----+--------
-     *   0  |  0   0
-     *   1  |  0   1
-     *   2  |  1   0
-     *   3  |  1   1
-     * @endcode
-     */
-    void format(int bits, int mode = 0);
-
-    /** Set the spi bus clock frequency
-     *
-     *  @param hz SCLK frequency in hz (default = 1MHz)
-     */
-    void frequency(int hz = 1000000);
-
-    /** Write to the SPI Slave and return the response
-     *
-     *  @param value Data to be sent to the SPI slave
-     *
-     *  @returns
-     *    Response from the SPI slave
-    */
-    virtual int write(int value);
-
-#if DEVICE_SPI_ASYNCH
-
-    /** Start non-blocking SPI transfer using 8bit buffers.
-     *
-     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
-     *                  the default SPI value is sent
-     * @param tx_length The length of TX buffer in bytes
-     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
-     *                  received data are ignored
-     * @param rx_length The length of RX buffer in bytes
-     * @param callback  The event callback function
-     * @param event     The logical OR of events to modify. Look at spi hal header file for SPI events.
-     * @return Zero if the transfer has started, or -1 if SPI peripheral is busy
-     */
-    template<typename Type>
-    int transfer(const Type *tx_buffer, int tx_length, Type *rx_buffer, int rx_length, const event_callback_t& callback, int event = SPI_EVENT_COMPLETE) {
-        if (spi_active(&_spi)) {
-            return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type)*8, callback, event);
-        }
-        start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type)*8, callback, event);
-        return 0;
-    }
-
-    /** Abort the on-going SPI transfer, and continue with transfer's in the queue if any.
-     */
-    void abort_transfer();
-
-    /** Clear the transaction buffer
-     */
-    void clear_transfer_buffer();
-
-    /** Clear the transaction buffer and abort on-going transfer.
-     */
-    void abort_all_transfers();
-
-    /** Configure DMA usage suggestion for non-blocking transfers
-     *
-     *  @param usage The usage DMA hint for peripheral
-     *  @return Zero if the usage was set, -1 if a transaction is on-going
-    */
-    int set_dma_usage(DMAUsage usage);
-
-protected:
-    /** SPI IRQ handler
-     *
-    */
-    void irq_handler_asynch(void);
-
-    /** Common transfer method
-     *
-     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
-     *                  the default SPI value is sent
-     * @param tx_length The length of TX buffer in bytes
-     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
-     *                  received data are ignored
-     * @param rx_length The length of RX buffer in bytes
-     * @param bit_width The buffers element width
-     * @param callback  The event callback function
-     * @param event     The logical OR of events to modify
-     * @return Zero if the transfer has started or was added to the queue, or -1 if SPI peripheral is busy/buffer is full
-    */
-    int transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event);
-
-    /**
-     *
-     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
-     *                  the default SPI value is sent
-     * @param tx_length The length of TX buffer in bytes
-     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
-     *                  received data are ignored
-     * @param rx_length The length of RX buffer in bytes
-     * @param bit_width The buffers element width
-     * @param callback  The event callback function
-     * @param event     The logical OR of events to modify
-     * @return Zero if a transfer was added to the queue, or -1 if the queue is full
-    */
-    int queue_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event);
-
-    /** Configures a callback, spi peripheral and initiate a new transfer
-     *
-     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
-     *                  the default SPI value is sent
-     * @param tx_length The length of TX buffer in bytes
-     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
-     *                  received data are ignored
-     * @param rx_length The length of RX buffer in bytes
-     * @param bit_width The buffers element width
-     * @param callback  The event callback function
-     * @param event     The logical OR of events to modify
-    */
-    void start_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event);
-
-#if TRANSACTION_QUEUE_SIZE_SPI
-
-    /** Start a new transaction
-     *
-     *  @param data Transaction data
-    */
-    void start_transaction(transaction_t *data);
-
-    /** Dequeue a transaction
-     *
-    */
-    void dequeue_transaction();
-    static CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> _transaction_buffer;
-#endif
-
-#endif
-
-public:
-    virtual ~SPI() {
-    }
-
-protected:
-    spi_t _spi;
-
-#if DEVICE_SPI_ASYNCH
-    CThunk<SPI> _irq;
-    event_callback_t _callback;
-    DMAUsage _usage;
-#endif
-
-    void aquire(void);
-    static SPI *_owner;
-    int _bits;
-    int _mode;
-    int _hz;
-};
-
-} // namespace mbed
-
-#endif
-
-#endif
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 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_SPI_H
+#define MBED_SPI_H
+
+#include "platform.h"
+
+#if DEVICE_SPI
+
+#include "PlatformMutex.h"
+#include "spi_api.h"
+#include "SingletonPtr.h"
+
+#if DEVICE_SPI_ASYNCH
+#include "CThunk.h"
+#include "dma_api.h"
+#include "CircularBuffer.h"
+#include "FunctionPointer.h"
+#include "Transaction.h"
+#endif
+
+namespace mbed {
+
+/** A SPI Master, used for communicating with SPI slave devices
+ *
+ * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
+ *
+ * Most SPI devices will also require Chip Select and Reset signals. These
+ * can be controlled using <DigitalOut> pins
+ *
+ * @Note Synchronization level: Thread safe
+ *
+ * Example:
+ * @code
+ * // Send a byte to a SPI slave, and record the response
+ *
+ * #include "mbed.h"
+ *
+ * // hardware ssel (where applicable)
+ * //SPI device(p5, p6, p7, p8); // mosi, miso, sclk, ssel
+ *
+ * // software ssel
+ * SPI device(p5, p6, p7); // mosi, miso, sclk
+ * DigitalOut cs(p8); // ssel
+ *
+ * int main() {
+ *     // hardware ssel (where applicable)
+ *     //int response = device.write(0xFF);
+ *
+ *     device.lock();
+ *     // software ssel
+ *     cs = 0;
+ *     int response = device.write(0xFF);
+ *     cs = 1;
+ *     device.unlock();
+ *
+ * }
+ * @endcode
+ */
+class SPI {
+
+public:
+
+    /** Create a SPI master connected to the specified pins
+     *
+     *  mosi or miso can be specfied as NC if not used
+     *
+     *  @param mosi SPI Master Out, Slave In pin
+     *  @param miso SPI Master In, Slave Out pin
+     *  @param sclk SPI Clock pin
+     *  @param ssel SPI chip select pin
+     */
+    SPI(PinName mosi, PinName miso, PinName sclk, PinName ssel=NC);
+
+    /** Configure the data transmission format
+     *
+     *  @param bits Number of bits per SPI frame (4 - 16)
+     *  @param mode Clock polarity and phase mode (0 - 3)
+     *
+     * @code
+     * mode | POL PHA
+     * -----+--------
+     *   0  |  0   0
+     *   1  |  0   1
+     *   2  |  1   0
+     *   3  |  1   1
+     * @endcode
+     */
+    void format(int bits, int mode = 0);
+
+    /** Set the spi bus clock frequency
+     *
+     *  @param hz SCLK frequency in hz (default = 1MHz)
+     */
+    void frequency(int hz = 1000000);
+
+    /** Write to the SPI Slave and return the response
+     *
+     *  @param value Data to be sent to the SPI slave
+     *
+     *  @returns
+     *    Response from the SPI slave
+    */
+    virtual int write(int value);
+
+    /** Acquire exclusive access to this SPI bus
+     */
+    virtual void lock(void);
+
+    /** Release exclusive access to this SPI bus
+     */
+    virtual void unlock(void);
+
+#if DEVICE_SPI_ASYNCH
+
+    /** Start non-blocking SPI transfer using 8bit buffers.
+     *
+     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
+     *                  the default SPI value is sent
+     * @param tx_length The length of TX buffer in bytes
+     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
+     *                  received data are ignored
+     * @param rx_length The length of RX buffer in bytes
+     * @param callback  The event callback function
+     * @param event     The logical OR of events to modify. Look at spi hal header file for SPI events.
+     * @return Zero if the transfer has started, or -1 if SPI peripheral is busy
+     */
+    template<typename Type>
+    int transfer(const Type *tx_buffer, int tx_length, Type *rx_buffer, int rx_length, const event_callback_t& callback, int event = SPI_EVENT_COMPLETE) {
+        if (spi_active(&_spi)) {
+            return queue_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type)*8, callback, event);
+        }
+        start_transfer(tx_buffer, tx_length, rx_buffer, rx_length, sizeof(Type)*8, callback, event);
+        return 0;
+    }
+
+    /** Abort the on-going SPI transfer, and continue with transfer's in the queue if any.
+     */
+    void abort_transfer();
+
+    /** Clear the transaction buffer
+     */
+    void clear_transfer_buffer();
+
+    /** Clear the transaction buffer and abort on-going transfer.
+     */
+    void abort_all_transfers();
+
+    /** Configure DMA usage suggestion for non-blocking transfers
+     *
+     *  @param usage The usage DMA hint for peripheral
+     *  @return Zero if the usage was set, -1 if a transaction is on-going
+    */
+    int set_dma_usage(DMAUsage usage);
+
+protected:
+    /** SPI IRQ handler
+     *
+    */
+    void irq_handler_asynch(void);
+
+    /** Common transfer method
+     *
+     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
+     *                  the default SPI value is sent
+     * @param tx_length The length of TX buffer in bytes
+     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
+     *                  received data are ignored
+     * @param rx_length The length of RX buffer in bytes
+     * @param bit_width The buffers element width
+     * @param callback  The event callback function
+     * @param event     The logical OR of events to modify
+     * @return Zero if the transfer has started or was added to the queue, or -1 if SPI peripheral is busy/buffer is full
+    */
+    int transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event);
+
+    /**
+     *
+     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
+     *                  the default SPI value is sent
+     * @param tx_length The length of TX buffer in bytes
+     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
+     *                  received data are ignored
+     * @param rx_length The length of RX buffer in bytes
+     * @param bit_width The buffers element width
+     * @param callback  The event callback function
+     * @param event     The logical OR of events to modify
+     * @return Zero if a transfer was added to the queue, or -1 if the queue is full
+    */
+    int queue_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event);
+
+    /** Configures a callback, spi peripheral and initiate a new transfer
+     *
+     * @param tx_buffer The TX buffer with data to be transfered. If NULL is passed,
+     *                  the default SPI value is sent
+     * @param tx_length The length of TX buffer in bytes
+     * @param rx_buffer The RX buffer which is used for received data. If NULL is passed,
+     *                  received data are ignored
+     * @param rx_length The length of RX buffer in bytes
+     * @param bit_width The buffers element width
+     * @param callback  The event callback function
+     * @param event     The logical OR of events to modify
+    */
+    void start_transfer(const void *tx_buffer, int tx_length, void *rx_buffer, int rx_length, unsigned char bit_width, const event_callback_t& callback, int event);
+
+#if TRANSACTION_QUEUE_SIZE_SPI
+
+    /** Start a new transaction
+     *
+     *  @param data Transaction data
+    */
+    void start_transaction(transaction_t *data);
+
+    /** Dequeue a transaction
+     *
+    */
+    void dequeue_transaction();
+    static CircularBuffer<Transaction<SPI>, TRANSACTION_QUEUE_SIZE_SPI> _transaction_buffer;
+#endif
+
+#endif
+
+public:
+    virtual ~SPI() {
+    }
+
+protected:
+    spi_t _spi;
+
+#if DEVICE_SPI_ASYNCH
+    CThunk<SPI> _irq;
+    event_callback_t _callback;
+    DMAUsage _usage;
+#endif
+
+    void aquire(void);
+    static SPI *_owner;
+    static SingletonPtr<PlatformMutex> _mutex;
+    int _bits;
+    int _mode;
+    int _hz;
+};
+
+} // namespace mbed
+
+#endif
+
+#endif