AP_HAL: example fix travis warning

missing function declaration
implicit cast
some style fix

libraries/AP_HAL/examples/AnalogIn/AnalogIn.cpp

@@ -1,5 +1,8 @@
 #include <AP_HAL/AP_HAL.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 AP_HAL::AnalogSource* ch;
@@ -18,7 +21,7 @@ void loop (void)
         hal.console->printf("\n");
     }
     hal.console->printf("[%u %.3f] ",
-			  (unsigned)pin, v);
+              (unsigned)pin, (double)v);
     pin = (pin+1) % 16;
     ch->set_pin(pin);
     hal.scheduler->delay(100);

libraries/AP_HAL/examples/Printf/Printf.cpp

@@ -1,6 +1,9 @@
 #include <AP_Common/AP_Common.h>
 #include <AP_HAL/AP_HAL.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 void setup(void) {
@@ -51,7 +54,7 @@ static void test_printf(void)
     uint8_t failures = 0;
     hal.console->printf("Running printf tests\n");
     for (i=0; i < ARRAY_SIZE(float_tests); i++) {
-        int ret = hal.util->snprintf(buf, sizeof(buf), float_tests[i].fmt, float_tests[i].v);
+        int ret = hal.util->snprintf(buf, sizeof(buf), float_tests[i].fmt, (double)float_tests[i].v);
         if (strcmp(buf, float_tests[i].result) != 0) {
             hal.console->printf("Failed float_tests[%u] '%s' -> '%s' should be '%s'\n",
                                 (unsigned)i,

libraries/AP_HAL/examples/RCInput/RCInput.cpp

@@ -4,6 +4,9 @@
 #include <AP_Common/AP_Common.h>
 #include <AP_HAL/AP_HAL.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 #define MAX_CHANNELS 16

libraries/AP_HAL/examples/RCInputToRCOutput/RCInputToRCOutput.cpp

@@ -6,6 +6,9 @@
 
 #include <AP_HAL/AP_HAL.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 #define MAX_CHANNELS 14
@@ -44,7 +47,7 @@ void loop(void)
     }
     if (changed) {
         for (uint8_t i = 0; i < max_channels; i++) {
-            hal.console->printf("%2u:%04u ", (unsigned)i + 1, (unsigned)last_value[i]);
+            hal.console->printf("%2u:%04u ", (unsigned)(i + 1), (unsigned)last_value[i]);
         }
         hal.console->printf("\n");
     }

libraries/AP_HAL/examples/RCOutput/RCOutput.cpp

@@ -4,6 +4,9 @@
 
 #include <AP_HAL/AP_HAL.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 void setup (void)
@@ -19,8 +22,7 @@ static int8_t delta = 1;
 
 void loop (void)
 {
-    uint8_t i;
+    for (uint8_t i=0; i < 14; i++) {
-    for (i=0; i<14; i++) {
         hal.rcout->write(i, pwm);
         pwm += delta;
         if (delta > 0 && pwm >= 2000) {

libraries/AP_HAL/examples/RCOutput2/RCOutput.cpp

@@ -6,6 +6,10 @@
 #include <AP_HAL/AP_HAL.h>
 #include <AP_Menu/AP_Menu.h>
 
+void setup();
+void loop();
+void drive(uint16_t hz_speed);
+
 #define MENU_FUNC(func) FUNCTOR_BIND(&commands, &Menu_Commands::func, int8_t, uint8_t, const Menu::arg *)
 
 #define ESC_HZ     490

libraries/AP_HAL/examples/Storage/Storage.cpp

@@ -4,6 +4,9 @@
 
 #include <AP_HAL/AP_HAL.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 AP_HAL::Storage *st;
@@ -20,15 +23,14 @@ void setup(void)
       Calculate XOR of the full conent of memory
       Do it by block of 8 bytes
     */
-    unsigned int i, j;
     unsigned char buff[8], XOR_res = 0;
 
-    for(i = 0; i < HAL_STORAGE_SIZE; i += 8)
+    for (uint32_t i = 0; i < HAL_STORAGE_SIZE; i += 8) {
-    {
         st->read_block((void *) buff, i, 8);
-        for(j = 0; j < 8; j++)
+        for(uint32_t j = 0; j < 8; j++) {
             XOR_res ^= buff[j];
         }
+    }
 
     /*
       print XORed result

libraries/AP_HAL/examples/UART_test/UART_test.cpp

@@ -8,6 +8,9 @@
 #include <stdio.h>
 #endif
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 /*
@@ -42,7 +45,7 @@ static void test_uart(AP_HAL::UARTDriver *uart, const char *name)
         return;
     }
     uart->printf("Hello on UART %s at %.3f seconds\n",
-                 name, AP_HAL::millis()*0.001f);
+                 name, (double)(AP_HAL::millis() * 0.001f));
 }
 
 void loop(void)
@@ -56,7 +59,7 @@ void loop(void)
     // also do a raw printf() on some platforms, which prints to the
     // debug console
 #if HAL_OS_POSIX_IO
-    ::printf("Hello on debug console at %.3f seconds\n", AP_HAL::millis()*0.001f);
+    ::printf("Hello on debug console at %.3f seconds\n", (double)(AP_HAL::millis() * 0.001f));
 #endif
 
     hal.scheduler->delay(1000);