examples: Cleaned up C examples.

This commit cleans up multiple items with the UPM C example source.

    * Switch from usleep and sleep to upm_delay* methods
    * Include a mraa_init and check return value prior to using sensor
    * All example mains now return
    * Added include for mraa.h and upm_utilites.h to all examples
    * Reformatted/removed tabs
    * Updated author line for the examples I wrote

Signed-off-by: Noel Eck <noel.eck@intel.com>

examples/c/a110x.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "a110x.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     a110x_context dev = a110x_init(2);
     bool abc = 0;
     while(1){

examples/c/bh1750.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "bh1750.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a BH1750 sensor on default I2C bus (0), using the
     // default I2C address (0x23), and setting the mode to highest
@@ -62,10 +70,10 @@ int main()
 
         bh1750_get_lux(sensor, &lux);
         printf("Detected Light Level (lux): %f\n", lux);
-      sleep(1);
+        upm_delay(1);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting\n");
 

examples/c/collision.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "collision.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     collision_context dev = collision_init(2);
     bool abc = 0;
     while(1){

examples/c/dfrec.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "dfrec.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    {
+        if (mraa_init() != MRAA_SUCCESS)
+            perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a DFRobot EC sensor on analog pin A0, with a ds18b20
     // temperature sensor connected to UART 0, and a device index (for
@@ -63,10 +71,10 @@ int main()
                 dfrec_get_volts(sensor), dfrec_get_temperature(sensor));
         printf("\n");
 
-      sleep(2);
+        upm_delay(2);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting...\n");
 

examples/c/dfrorp.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "dfrorp.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a DFRobot ORP sensor on analog pin A0 with an analog
     // reference voltage of 5.0.
@@ -73,10 +81,10 @@ int main()
 
         printf("ORP = %f mV\n", dfrorp_get_orp(sensor));
 
-      sleep(1);
+        upm_delay(1);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting...\n");
 

examples/c/dfrph.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "dfrph.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -61,7 +69,7 @@ int main()
         printf("Detected volts: %0.03f\n", volts);
         printf("pH value: %0.03f\n", pH);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/ds18b20.c

@@ -27,6 +27,8 @@
 #include <signal.h>
 
 #include "ds18b20.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -38,9 +40,15 @@ void sig_handler(int signo)
 
 int main(int argc, char **argv)
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Initializing...\n");
 
@@ -69,13 +77,13 @@ int main(int argc, char **argv)
         }
         printf("\n");
 
-      sleep(2);
+        upm_delay(2);
     }
 
     printf("Exiting...\n");
 
     ds18b20_close(sensor);
-//! [Interesting]
+    //! [Interesting]
 
     return 0;
 }

examples/c/emg.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "emg.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -73,7 +81,7 @@ int main()
         printf("Normalized output: %0.03f, raw emg sensor output: %0.03f v "
                 "adjusted output: %0.03f v\n", normalized, raw_volts, volts);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/flex.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "flex.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -73,7 +81,7 @@ int main()
         printf("Normalized output: %0.03f, raw flex sensor output: %0.03f v "
                 "adjusted output: %0.03f v\n", normalized, raw_volts, volts);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/gp2y0a.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "gp2y0a.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     gp2y0a_context dev = gp2y0a_init(14, 5.0);
     float val;
     while(1){

examples/c/grovemoisture.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "grovemoisture.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     grovemoisture_context dev = grovemoisture_init(14);
     int val;
     while(1){

examples/c/gsr.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "gsr.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -73,7 +81,7 @@ int main()
         printf("Normalized output: %0.03f, raw gsr sensor output: %0.03f v "
                 "adjusted output: %0.03f v\n", normalized, raw_volts, volts);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/hka5.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "hka5.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a HKA5 sensor on uart 0.  We don't use the set or
     // reset pins, so we pass -1 for them.
@@ -65,10 +73,10 @@ int main()
         printf("PM 10 : %d ug/m3\n", hka5_get_pm10(sensor));
         printf("\n");
 
-      sleep(2);
+        upm_delay(2);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting\n");
 

examples/c/joystick12.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,9 @@
 #include <signal.h>
 
 #include "joystick12.h"
+#include "upm_utilities.h"
+#include "mraa.h"
+
 
 bool shouldRun = true;
 
@@ -37,6 +40,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -73,7 +82,7 @@ int main()
         joystick12_get_value_y(sensor, &y);
 
         printf("X: %5.02f Y: %5.02f\n", x, y);
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/ldt0028.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "ldt0028.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -82,7 +90,7 @@ int main()
                     "adjusted output: %0.03f v\n\n", normalized, raw_volts, volts);
         }
 
-        usleep(50000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/led.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "led.h"
 
-void main(void)
+#include "upm_utilities.h"
+#include "mraa.h"
+
+int main(void)
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     led_context dev = led_init(2);
     while(1){
         if(led_on(dev) != UPM_SUCCESS){
@@ -21,4 +30,5 @@ void main(void)
         upm_delay(1);
     }
     led_close(dev);
+    return 0;
 }

examples/c/light.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "light.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -73,7 +81,7 @@ int main()
         printf("Normalized output: %0.03f, raw light sensor output: %0.03f v "
                 "light output: %0.03f lux\n", normalized, raw_volts, lux);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/loudness.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "loudness.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     loudness_context dev = loudness_init(14);
     int val;
     while(1){

examples/c/m24lr64e.c

@@ -5,8 +5,17 @@
 #include <unistd.h>
 #include "m24lr64e.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     m24lr64e_context dev = m24lr64e_init(0, M24LR64E_USER_MODE);
     int addr = M24LR64E_EEPROM_I2C_LENGTH-1;
     printf("address being accessed: %d\n", addr);

examples/c/mma7361.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "mma7361.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a MMA7361 sensor on analog pins A0 (X), A1 (Y) A2
     // (Z), selftest pin on D2, sleep pin on D3 nd an analog reference
@@ -72,10 +80,10 @@ int main()
         printf("Volts x = %f y = %f z = %f\n\n",
                 x, y, z);
 
-      usleep(100000);
+        upm_delay_ms(500);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting...\n");
 

examples/c/moisture.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "moisture.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     moisture_context dev = moisture_init(14);
     int val;
     while(1){
@@ -22,4 +31,3 @@ int main()
 
     return 0;
 }
-

examples/c/mpr121.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "mpr121.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     mpr121_context dev = mpr121_init(MPR121_I2C_BUS, MPR121_DEFAULT_I2C_ADDR);
 
     if(mpr121_config_an3944(dev) != UPM_SUCCESS){

examples/c/mq303a.c

@@ -7,7 +7,16 @@
 #include <unistd.h>
 #include "mq303a.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main() {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
 
     /* --------- MQ303A EXAMPLE -------- */
     mq303a_context dev = mq303a_init(0, 15);
@@ -23,4 +32,3 @@ int main() {
 
     return 0;
 }
-

examples/c/mqx.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "mqx.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -73,7 +81,7 @@ int main()
         printf("Normalized output: %0.03f, raw mqx sensor output: %0.03f v "
                 "adjusted output: %0.03f v\n", normalized, raw_volts, volts);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/nmea_gps.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "nmea_gps.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -39,9 +41,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a NMEA_GPS sensor on uart 0 at 9600 baud with enable
     // pin on D3.  If you do not need an enable pin, you can specify -1.
@@ -70,7 +78,7 @@ int main()
     if (shouldRun)
         printf("Timed out\n");
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting\n");
 

examples/c/nmea_gps_i2c.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "nmea_gps.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -39,9 +41,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a NMEA_GPS UBLOX based i2c sensor on i2c bus 0 at
     // address 0x42
@@ -60,7 +68,7 @@ int main()
     while (shouldRun)
     {
         if (!nmea_gps_data_available(sensor, 0))
-        usleep(100);
+            upm_delay_ms(500);
         else
         {
             if ((rv = nmea_gps_read(sensor, buffer, bufferLength)) >= 0)
@@ -72,7 +80,7 @@ int main()
         }
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting\n");
 

examples/c/o2.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "o2.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -62,7 +70,7 @@ int main()
         printf("O2 raw volts: %0.03f v, o2: %0.03f %%\n",
                 raw_volts, o2_percent);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/servo.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "es08a.c"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     es08a_context dev = es08a_init(3, ES08A_MIN_PULSE_WIDTH, ES08A_MAX_PULSE_WIDTH);
     if(dev == NULL){
         printf("unable to initialize the servo context\n");

examples/c/sht1x.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "sht1x.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a SHT1X sensor using D2 as the clock, and D3 as the
     // data pin.
@@ -64,10 +72,10 @@ int main()
         printf("Humidity:    %f RH\n", sht1x_get_humidity(sensor));
         printf("\n");
 
-      sleep(2);
+        upm_delay(2);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting\n");
 

examples/c/slide.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "slide.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -73,7 +81,7 @@ int main()
         printf("Normalized output: %0.03f, raw slide sensor output: %0.03f v "
                 "adjusted output: %0.03f v\n", normalized, raw_volts, volts);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]

examples/c/tsl2561.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "tsl2561.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     tsl2561_context dev = tsl2561_init(0, TSL2561_Address, GAIN_0X, INTEGRATION_TIME1_101MS);
     float abc = 0;
     if(tsl2561_get_lux(dev, &abc) != UPM_SUCCESS){

examples/c/ttp223.c

@@ -7,8 +7,17 @@
 #include <unistd.h>
 #include "ttp223.h"
 
+#include "upm_utilities.h"
+#include "mraa.h"
+
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     ttp223_context dev = ttp223_init(2);
     bool abc = 0;
     while(1){

examples/c/urm37-uart.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "urm37.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a URM37 sensor on UART 0, with the reset pin on D2
     urm37_context sensor = urm37_init(0, 2, 0, 0, 0, false);
@@ -62,10 +70,10 @@ int main()
 
         urm37_get_temperature(sensor, &temperature);
         printf("Temperature (C): %f\n\n", temperature);
-      usleep(500000);
+        upm_delay_ms(500);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting\n");
 

examples/c/urm37.c

@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "urm37.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,9 +39,15 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
-//! [Interesting]
+    //! [Interesting]
 
     // Instantiate a URM37 sensor on analog pin A0, reset pin on D2,
     // trigger pin on D3 with an analog reference voltage of 5.0
@@ -60,10 +68,10 @@ int main()
 
         urm37_get_distance(sensor, &distance, 0);
         printf("Detected distance (cm): %f\n", distance);
-      usleep(500000);
+        upm_delay_ms(500);
     }
 
-//! [Interesting]
+    //! [Interesting]
 
     printf("Exiting\n");
 

examples/c/vdiv.c

@@ -1,5 +1,5 @@
 /*
- * Author: Jon Trulson <jtrulson@ics.com>
+ * Author: Noel Eck <noel.eck@intel.com>
  * Copyright (c) 2016 Intel Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
@@ -26,6 +26,8 @@
 #include <signal.h>
 
 #include "vdiv.h"
+#include "upm_utilities.h"
+#include "mraa.h"
 
 bool shouldRun = true;
 
@@ -37,6 +39,12 @@ void sig_handler(int signo)
 
 int main()
 {
+    if (mraa_init() != MRAA_SUCCESS)
+    {
+        perror("Failed to initialize mraa\n");
+        return -1;
+    }
+
     signal(SIGINT, sig_handler);
 
     //! [Interesting]
@@ -61,7 +69,7 @@ int main()
         printf("Divide SW: %d ADC voltage: %0.03f Sensor voltage: %0.03f\n",
                 vdiv_get_divsw(sensor), raw_volts, computed_volts);
 
-        usleep(500000);
+        upm_delay_ms(500);
     }
 
     //! [Interesting]