Diff: common/SPI.cpp

Revision:

0:0a673c671a56

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/common/SPI.cpp	Wed Jul 27 18:35:32 2016 +0000
@@ -0,0 +1,63 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 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.
+ */
+#include "SPI.h"
+
+#if DEVICE_SPI
+
+namespace mbed {
+
+SPI::SPI(PinName mosi, PinName miso, PinName sclk, PinName _unused) :
+        _spi(),
+        _bits(8),
+        _mode(0),
+        _hz(1000000) {
+    spi_init(&_spi, mosi, miso, sclk, NC);
+    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