rn2903: Initial implementation; C; C++ wraps C; examples

This requires a new MRAA with UART sendbreak support.

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

examples/c/rn2903-p2p-rx.c

@@ -0,0 +1,137 @@
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2017 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 <string.h>
+#include <signal.h>
+
+#include "rn2903.h"
+#include "upm_utilities.h"
+#include "upm_platform.h"
+
+int shouldRun = true;
+
+void sig_handler(int signo)
+{
+    if (signo == SIGINT)
+        shouldRun = false;
+}
+
+#if defined(UPM_PLATFORM_ZEPHYR) && !defined(CONFIG_STDOUT_CONSOLE)
+# define printf printk
+#endif
+
+int main(int argc, char **argv)
+{
+//! [Interesting]
+
+    char *defaultDev = "/dev/ttyUSB0";
+    if (argc > 1)
+        defaultDev = argv[1];
+
+    printf("Using device: %s\n", defaultDev);
+
+    // Instantiate a RN2903 sensor on defaultDev at 57600 baud.
+#if defined(UPM_PLATFORM_ZEPHYR)
+    rn2903_context sensor = rn2903_init(0, RN2903_DEFAULT_BAUDRATE);
+#else
+    rn2903_context sensor = rn2903_init_tty(defaultDev,
+                                            RN2903_DEFAULT_BAUDRATE);
+#endif
+
+    // To use an internal UART understood by MRAA, use the following
+    // to inititialize rather than the above, which by default uses a
+    // tty path.
+    //
+    // rn2903_context sensor = rn2903_init(0, RN2903_DEFAULT_BAUDRATE);
+
+    if (!sensor)
+    {
+        printf("rn2903_init_tty() failed.\n");
+        return 1;
+    }
+
+    // enable debugging
+    // rn2903_set_debug(sensor, true);
+
+    // get version
+    if (rn2903_command(sensor, "sys get ver"))
+    {
+        printf("Failed to retrieve device version string\n");
+        rn2903_close(sensor);
+        return 1;
+    }
+    printf("Firmware version: %s\n", rn2903_get_response(sensor));
+
+    printf("Hardware EUI: %s\n", rn2903_get_hardware_eui(sensor));
+
+    // For this example, we will just try to receive a packet
+    // transmitted by the p2p-tx rn2903 example.  We reset the
+    // device to defaults, and we do not make any adjustments to the
+    // radio configuration.  You will probably want to do so for a
+    // real life application.
+
+    // The first thing to do is to suspend the LoRaWAN stack on the device.
+    if (rn2903_mac_pause(sensor))
+    {
+        printf("Failed to pause the LoRaWAN stack\n");
+        rn2903_close(sensor);
+        return 1;
+    }
+
+    // We will use continuous mode (window_size 0), though the default
+    // radio watch dog timer will expire every 15 seconds.  We will
+    // just loop here.
+    while (shouldRun)
+    {
+        printf("Waiting for packet...\n");
+        RN2903_RESPONSE_T rv;
+        rv = rn2903_radio_rx(sensor, 0);
+        if (rv)
+        {
+            printf("rn2903_radio_rx() failed with code (%d)\n", rv);
+        }
+        else
+        {
+            const char *resp = rn2903_get_response(sensor);
+            const char *payload = rn2903_get_radio_rx_payload(sensor);
+            if (!payload)
+                printf("Got response: '%s'\n", resp);
+            else
+                printf("Got payload: '%s'\n",
+                       rn2903_from_hex(sensor, payload));
+        }
+
+        printf("\n");
+    }
+
+    printf("Exiting\n");
+
+    rn2903_close(sensor);
+
+//! [Interesting]
+
+    return 0;
+}