my9221: C implementation; C example; C++ wraps C

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

examples/c/CMakeLists.txt

@@ -137,6 +137,7 @@ add_example (guvas12d)
 add_example (otp538u)
 add_example (button)
 add_example (button_intr)
+add_example (my9221)
 
 # Custom examples
 add_custom_example (nmea_gps_i2c-example-c nmea_gps_i2c.c nmea_gps)

examples/c/my9221.c

@@ -0,0 +1,89 @@
+/*
+ * 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 <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+
+#include <upm_utilities.h>
+#include <my9221.h>
+
+int shouldRun = true;
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+
+int main ()
+{
+    signal(SIGINT, sig_handler);
+
+//! [Interesting]
+
+    // Instantiate a GroveLEDBar, we use D8 for the data, and D9 for the
+    // clock.  We only use a single instance.
+    my9221_context leds = my9221_init(8, 9, 1);
+
+    if (!leds)
+    {
+        printf("my9221_init() failed\n");
+        return 1;
+    }
+
+    while (shouldRun)
+    {
+        // count up
+        printf("Counting up: ");
+        for (int i=0; i<my9221_get_max_leds(leds); i++)
+        {
+            printf("%d ", i);
+            my9221_clear_all(leds);
+            my9221_set_led(leds, i, true);
+            upm_delay_ms(100);
+        }
+        printf("\n");
+        upm_delay_ms(100);
+
+        // count down
+        printf("Counting down: ");
+        for (int i=my9221_get_max_leds(leds) - 1; i>=0; i--)
+        {
+            printf("%d ", i);
+            my9221_clear_all(leds);
+            my9221_set_led(leds, i, true);
+            upm_delay_ms(100);
+        }
+        printf("\n");
+        upm_delay_ms(100);
+    }
+
+    printf("Exiting...\n");
+
+    my9221_close(leds);
+//! [Interesting]
+    return 0;
+}