Diff: SPI.h

Revision:

0:a8fa94490a0a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPI.h	Sat Sep 22 10:32:07 2012 +0000
@@ -0,0 +1,113 @@
+/* mbed Microcontroller Library - SPI
+ * Copyright (c) 2010-2011 ARM Limited. All rights reserved. 
+ */
+
+#ifndef MBED_SPI_H
+#define MBED_SPI_H
+
+#include "device.h"
+
+#if DEVICE_SPI
+
+#include "platform.h"
+#include "PinNames.h"
+#include "PeripheralNames.h"
+#include "Base.h"
+
+namespace mbed {
+
+/* Class: SPI
+ *  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:
+ * > // Send a byte to a SPI slave, and record the response
+ * >
+ * > #include "mbed.h"
+ * >
+ * > SPI device(p5, p6, p7); // mosi, miso, sclk
+ * >
+ * > int main() {
+ * >     int response = device.write(0xFF);
+ * > }
+ */ 
+class SPI : public Base {
+
+public:
+
+    /* Constructor: SPI
+     *  Create a SPI master connected to the specified pins
+     *
+     * Variables:
+     *  mosi - SPI Master Out, Slave In pin
+     *  miso - SPI Master In, Slave Out pin
+     *  sclk - SPI Clock pin
+     *  name - (optional) A string to identify the object     
+     *
+     * Pin Options:
+     *  (5, 6, 7) or (11, 12, 13)
+     *
+     *  mosi or miso can be specfied as NC if not used
+     */
+    SPI(PinName mosi, PinName miso, PinName sclk, const char *name = NULL);
+
+    /* Function: format
+     *  Configure the data transmission format
+     *
+     * Variables:
+     *  bits - Number of bits per SPI frame (4 - 16)
+     *  mode - Clock polarity and phase mode (0 - 3)
+     *
+     * > mode | POL PHA 
+     * > -----+--------	 
+     * >   0  |  0   0 
+     * >   1  |  0   1
+     * >   2  |  1   0 
+     * >   3  |  1   1
+     */
+    void format(int bits, int mode = 0);
+
+    /* Function: frequency
+     *  Set the spi bus clock frequency
+     *
+     * Variables:
+     *  hz - SCLK frequency in hz (default = 1MHz)
+     */
+    void frequency(int hz = 1000000);
+
+    /* Function: write
+     *  Write to the SPI Slave and return the response
+     *
+     * Variables:
+     *  value - Data to be sent to the SPI slave
+     *  returns - Response from the SPI slave
+    */
+    virtual int write(int value);
+
+
+#ifdef MBED_RPC
+    virtual const struct rpc_method *get_rpc_methods();
+    static struct rpc_class *get_rpc_class();
+#endif
+
+protected:
+
+	SPIName _spi;
+	
+	void aquire(void);
+    static SPI *_owner; 
+    int _bits;
+    int _mode;
+    int _hz;
+
+};
+
+} // namespace mbed
+
+#endif
+
+#endif