Filter: example fix travis warning

missing function declaration
implicit cast
some style fix

libraries/Filter/examples/Derivative/Derivative.cpp

@@ -6,14 +6,17 @@
 #include <Filter/Filter.h>
 #include <Filter/DerivativeFilter.h>
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 #define USE_NOISE 0
 
-DerivativeFilter<float,11> derivative;
+DerivativeFilter<float, 11> derivative;
 
 // setup routine
-void setup(){}
+void setup() {}
 
 static float noise(void)
 {
@@ -24,17 +27,17 @@ static float noise(void)
 #endif
 }
 
-//Main loop where the action takes place
+// Main loop where the action takes place
 void loop()
 {
     hal.scheduler->delay(50);
-    float t = AP_HAL::millis()*1.0e-3f;
+    float t = AP_HAL::millis() * 1.0e-3f;
     float s = sinf(t);
     s += noise();
     uint32_t t1 = AP_HAL::micros();
     derivative.update(s, t1);
     float output = derivative.slope() * 1.0e6f;
-    hal.console->printf("%f %f %f %f\n", t, output, s, cosf(t));
+    hal.console->printf("%f %f %f %f\n", (double)t, (double)output, (double)s, (double)cosf(t));
 }
 
 AP_HAL_MAIN();

libraries/Filter/examples/Filter/Filter.cpp

@@ -8,6 +8,10 @@
 #include <Filter/ModeFilter.h>         // ModeFilter class (inherits from Filter class)
 #include <Filter/AverageFilter.h>      // AverageFilter class (inherits from Filter class)
 
+void setup();
+void loop();
+void readTemp();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 int16_t rangevalue[] = {31000, 31000, 50, 55, 60, 55, 10, 0, 31000};
@@ -38,7 +42,7 @@ void readTemp()
     uint16_t _temp_sensor;
 
     next_num++;
-    buf[0] = next_num;     //next_num;
+    buf[0] = next_num;  //next_num;
     buf[1] = 0xFF;
 
     _temp_sensor = buf[0];
@@ -53,10 +57,10 @@ void readTemp()
     hal.console->printf("RT: %lu\n", (unsigned long)raw_temp);
 }
 
-//Main loop where the action takes place
+// Main loop where the action takes place
 void loop()
 {
-    for (uint8_t j=0; j<0xFF; j++ ) {
+    for (uint8_t j = 0; j < 0xFF; j++) {
         readTemp();
         hal.scheduler->delay(100);
     }

libraries/Filter/examples/LowPassFilter/LowPassFilter.cpp

@@ -7,6 +7,9 @@
 #include <Filter/Filter.h>                     // Filter library
 #include <Filter/LowPassFilter.h>      // LowPassFilter class (inherits from Filter class)
 
+void setup();
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 // create a global instance of the class
@@ -28,26 +31,22 @@ void setup()
 //Main loop where the action takes place
 void loop()
 {
-    int16_t i;
-    float new_value;
-    float filtered_value;
-
     // reset value to 100.  If not reset the filter will start at the first value entered
     low_pass_filter.reset(0);
 
-    for( i=0; i<300; i++ ) {
+    for(int16_t i = 0; i < 300; i++ ) {
 
         // new data value
-        new_value = sinf((float)i*2*M_PI*5/50.0f);  // 5hz
+        const float new_value = sinf((float)i * 2 * M_PI * 5 / 50.0f);  // 5hz
 
         // output to user
-        hal.console->printf("applying: %6.4f", new_value);
+        hal.console->printf("applying: %6.4f", (double)new_value);
 
         // apply new value and retrieved filtered result
-        filtered_value = low_pass_filter.apply(new_value, 0.02f);
+        const float filtered_value = low_pass_filter.apply(new_value, 0.02f);
 
         // display results
-        hal.console->printf("\toutput: %6.4f\n", filtered_value);
+        hal.console->printf("\toutput: %6.4f\n", (double)filtered_value);
 
         hal.scheduler->delay(10);
     }

libraries/Filter/examples/LowPassFilter2p/LowPassFilter2p.cpp

@@ -7,6 +7,8 @@
 #include <Filter/Filter.h>                     // Filter library
 #include <Filter/LowPassFilter2p.h>
 
+void loop();
+
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 
 // craete an instance with 800Hz sample rate and 30Hz cutoff
@@ -21,23 +23,19 @@ static void setup()
 
 void loop()
 {
-    int16_t i;
-    float new_value;
-    float filtered_value;
-
-    for( i=0; i<300; i++ ) {
+    for(int16_t i = 0; i < 300; i++ ) {
 
         // new data value
-        new_value = sinf((float)i*2*M_PI*5/50.0f);  // 5hz
+        const float new_value = sinf((float)i * 2 * M_PI * 5 / 50.0f);  // 5hz
 
         // output to user
-        hal.console->printf("applying: %6.4f", new_value);
+        hal.console->printf("applying: %6.4f", (double)new_value);
 
         // apply new value and retrieved filtered result
-        filtered_value = low_pass_filter.apply(new_value);
+        const float filtered_value = low_pass_filter.apply(new_value);
 
         // display results
-        hal.console->printf("\toutput: %6.4f\n", filtered_value);
+        hal.console->printf("\toutput: %6.4f\n", (double)filtered_value);
 
         hal.scheduler->delay(10);
     }