Diff: features/unsupported/tests/libs/SPIHalfDuplex/SPIHalfDuplex.h

Revision:

0:f269e3021894

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/features/unsupported/tests/libs/SPIHalfDuplex/SPIHalfDuplex.h	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,85 @@
+/* mbed Microcontroller Library - SPIHalfDuplex
+ * Copyright (c) 2010-2011 ARM Limited. All rights reserved.
+ */
+#ifndef MBED_SPIHALFDUPLEX_H
+#define MBED_SPIHALFDUPLEX_H
+
+#include "platform.h"
+
+#if DEVICE_SPI
+
+#include "SPI.h"
+
+namespace mbed {
+
+/** A SPI half-duplex master, used for communicating with SPI slave devices
+ * over a shared data line.
+ *
+ * The default format is set to 8-bits for both master and slave, and a
+ * clock frequency of 1MHz
+ *
+ * Most SPI devies will also require Chip Select and Reset signals. These
+ * can be controlled using <DigitalOut> pins.
+ *
+ * Although this is for a shared data line, both MISO and MOSI are defined,
+ * and should be tied together externally to the mbed. This class handles
+ * the tri-stating of the MOSI pin.
+ *
+ * Example:
+ * @code
+ * // Send a byte to a SPI half-duplex slave, and record the response
+ *
+ * #include "mbed.h"
+ *
+ * SPIHalfDuplex device(p5, p6, p7) // mosi, miso, sclk
+ *
+ * int main() {
+ *     int respone = device.write(0xAA);
+ * }
+ * @endcode
+ */
+
+class SPIHalfDuplex : public SPI {
+
+public:
+
+    /** Create a SPI half-duplex master connected to the specified pins
+     *
+     * Pin Options:
+     *  (5, 6, 7) or (11, 12, 13)
+     *
+     *  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 name (optional) A string to identify the object
+     */
+    SPIHalfDuplex(PinName mosi, PinName miso, PinName sclk);
+
+    /** 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);
+
+    /** Set the number of databits expected from the slave, from 4-16
+     *
+     *  @param sbits Number of expected bits in the slave response
+     */
+    void slave_format(int sbits);
+
+protected:
+    PinName _mosi;
+    PinName _miso;
+    int     _sbits;
+}; // End of class
+
+} // End of namespace mbed
+
+#endif
+
+#endif