Diff: SPIHalfDuplex.cpp

Revision:

0:e9b41fc7d351

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SPIHalfDuplex.cpp	Thu Dec 06 12:47:45 2012 +0000
@@ -0,0 +1,65 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * NOTE: This is an unsupported legacy untested library.
+ */
+#include "SPIHalfDuplex.h"
+
+#if DEVICE_SPI
+
+#include "spi_api.h"
+#include "PinNames.h"
+#include "pinmap.h"
+
+#define GPIO_MODE 0
+#define SPI_MODE  2
+
+namespace mbed {
+
+SPIHalfDuplex::SPIHalfDuplex(PinName mosi, PinName miso, PinName sclk,
+        const char *name) : SPI(mosi, miso, sclk, name) {
+    _mosi = mosi;
+    _miso = miso;
+    _sbits = _bits;
+}
+
+void SPIHalfDuplex::slave_format(int sbits) {
+    _sbits = sbits;
+}
+
+int SPIHalfDuplex::write(int value) {
+    int t_bits = _bits;
+    pin_function(_mosi, SPI_MODE);
+    int ret_val = SPI::write(value);
+    if(ret_val != value) {
+        return -1;
+    }
+    format(_sbits, _mode);
+    pin_function(_mosi, GPIO_MODE);
+    ret_val = SPI::write(0x55);
+    format(t_bits, _mode);
+    pin_function(_mosi, SPI_MODE);
+    return ret_val;
+}
+
+} // end namespace mbed
+
+#endif