AP_HAL_PX4: implement new AP_HAL functions

Implement the new AP_HAL functions and use them in the Scheduler when
possible.

libraries/AP_HAL_PX4/Scheduler.cpp

@@ -87,22 +87,22 @@ void PX4Scheduler::init(void *unused)
 
 uint64_t PX4Scheduler::micros64() 
 {
-    return hrt_absolute_time();
+    return AP_HAL::micros64();
 }
 
 uint64_t PX4Scheduler::millis64() 
 {
-    return micros64() / 1000;
+    return AP_HAL::millis64();
 }
 
 uint32_t PX4Scheduler::micros() 
 {
-    return micros64() & 0xFFFFFFFF;
+    return AP_HAL::micros();
 }
 
 uint32_t PX4Scheduler::millis() 
 {
-    return millis64() & 0xFFFFFFFF;
+    return AP_HAL::millis();
 }
 
 /**
@@ -165,9 +165,9 @@ void PX4Scheduler::delay(uint16_t ms)
         return;
     }
     perf_begin(_perf_delay);
-	uint64_t start = micros64();
+	uint64_t start = AP_HAL::micros64();
     
-    while ((micros64() - start)/1000 < ms && 
+    while ((AP_HAL::micros64() - start)/1000 < ms && 
            !_px4_thread_should_exit) {
         delay_microseconds_semaphore(1000);
         if (_min_delay_cb_ms <= ms) {
@@ -296,8 +296,8 @@ void *PX4Scheduler::_timer_thread(void)
         // process any pending RC input requests
         ((PX4RCInput *)hal.rcin)->_timer_tick();
 
-        if (px4_ran_overtime && millis() - last_ran_overtime > 2000) {
+        if (px4_ran_overtime && AP_HAL::millis() - last_ran_overtime > 2000) {
-            last_ran_overtime = millis();
+            last_ran_overtime = AP_HAL::millis();
             printf("Overtime in task %d\n", (int)AP_Scheduler::current_task);
             hal.console->printf("Overtime in task %d\n", (int)AP_Scheduler::current_task);
         }
@@ -399,7 +399,7 @@ bool PX4Scheduler::system_initializing() {
 
 void PX4Scheduler::system_initialized() {
     if (_initialized) {
-        panic("PANIC: scheduler::system_initialized called"
+        AP_HAL::panic("PANIC: scheduler::system_initialized called"
                    "more than once");
     }
     _initialized = true;

libraries/AP_HAL_PX4/system.cpp

@@ -1,9 +1,53 @@
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <drivers/drv_hrt.h>
+
+#include <AP_HAL/AP_HAL.h>
 #include <AP_HAL/system.h>
 
+extern const AP_HAL::HAL& hal;
+
+extern bool _px4_thread_should_exit;
+
 namespace AP_HAL {
 
 void init()
 {
 }
 
+void panic(const char *errormsg, ...)
+{
+    va_list ap;
+
+    va_start(ap, errormsg);
+    vdprintf(1, errormsg, ap);
+    va_end(ap);
+    write(1, "\n", 1);
+
+    hal.scheduler->delay_microseconds(10000);
+    _px4_thread_should_exit = true;
+    exit(1);
+}
+
+uint32_t micros()
+{
+    return micros64() & 0xFFFFFFFF;
+}
+
+uint32_t millis()
+{
+    return millis64() & 0xFFFFFFFF;
+}
+
+uint64_t micros64()
+{
+    return hrt_absolute_time();
+}
+
+uint64_t millis64()
+{
+    return micros64() / 1000;
+}
+
 } // namespace AP_HAL