rpr220: add C driver and examples; FTI; C++ wraps C

Signed-off-by: Jon Trulson <jtrulson@ics.com>

src/rpr220/rpr220.c

@@ -0,0 +1,107 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * 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 <assert.h>
+
+#include "rpr220.h"
+
+rpr220_context rpr220_init(int pin)
+{
+    rpr220_context dev =
+        (rpr220_context)malloc(sizeof(struct _rpr220_context));
+
+    if (!dev)
+        return NULL;
+
+    dev->gpio = NULL;
+    dev->isrInstalled = false;
+
+    // make sure MRAA is initialized
+    int mraa_rv;
+    if ((mraa_rv = mraa_init()) != MRAA_SUCCESS)
+    {
+        printf("%s: mraa_init() failed (%d).\n", __FUNCTION__, mraa_rv);
+        rpr220_close(dev);
+        return NULL;
+    }
+
+    // MRAA contexts...
+    if ( !(dev->gpio = mraa_gpio_init(pin)) )
+    {
+        printf("%s: mraa_gpio_init() failed\n",
+               __FUNCTION__);
+        rpr220_close(dev);
+        return NULL;
+    }
+
+    mraa_gpio_dir(dev->gpio, MRAA_GPIO_IN);
+
+    return dev;
+}
+
+void rpr220_close(rpr220_context dev)
+{
+    assert(dev != NULL);
+
+    if (dev->isrInstalled)
+        rpr220_uninstall_isr(dev);
+
+    if (dev->gpio)
+        mraa_gpio_close(dev->gpio);
+
+    free(dev);
+}
+
+bool rpr220_black_detected(const rpr220_context dev)
+{
+    assert(dev != NULL);
+
+    return (mraa_gpio_read(dev->gpio) ? true : false);
+}
+
+void rpr220_install_isr(const rpr220_context dev,
+                        void (*isr)(void *), void *arg)
+{
+    assert(dev != NULL);
+
+    if (dev->isrInstalled)
+        rpr220_uninstall_isr(dev);
+
+    // install our interrupt handler
+    if (mraa_gpio_isr(dev->gpio, MRAA_GPIO_EDGE_RISING, isr, arg))
+    {
+        printf("%s: mraa_gpio_isr() failed.\n", __FUNCTION__);
+        return;
+    }
+
+    dev->isrInstalled = true;
+}
+
+void rpr220_uninstall_isr(const rpr220_context dev)
+{
+    assert(dev != NULL);
+
+    mraa_gpio_isr_exit(dev->gpio);
+    dev->isrInstalled = false;
+}