Diff: cpp/SPI.cpp

Revision:

0:fd0d7bdfcdc2

Child:

2:143cac498751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cpp/SPI.cpp	Tue Nov 20 17:24:08 2012 +0000
@@ -0,0 +1,68 @@
+/* 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.
+ */
+#include "SPI.h"
+
+#if DEVICE_SPI
+
+namespace mbed {
+
+SPI::SPI(PinName mosi, PinName miso, PinName sclk) {
+    spi_init(&_spi, mosi, miso, sclk, NC);
+    _bits = 8;
+    _mode = 0;
+    _hz = 1000000;
+    spi_format(&_spi, _bits, _mode, 0);
+    spi_frequency(&_spi, _hz);
+}
+
+void SPI::format(int bits, int mode) {
+    _bits = bits;
+    _mode = mode;
+    SPI::_owner = NULL; // Not that elegant, but works. rmeyer
+    aquire();
+}
+
+void SPI::frequency(int hz) { 
+    _hz = hz;
+    SPI::_owner = NULL; // Not that elegant, but works. rmeyer
+    aquire();
+}
+
+SPI* SPI::_owner = NULL;
+
+// ignore the fact there are multiple physical spis, and always update if it wasnt us last
+void SPI::aquire() {
+     if (_owner != this) {
+        spi_format(&_spi, _bits, _mode, 0);
+        spi_frequency(&_spi, _hz);
+        _owner = this;
+    }
+}
+
+int SPI::write(int value) {
+    aquire();
+    return spi_master_write(&_spi, value);
+}
+
+} // namespace mbed
+
+#endif