Add a method to detect the HAL runtime version (#228)

hal/include/HAL/HAL.h

@@ -38,6 +38,11 @@
 
 namespace HALUsageReporting = nUsageReporting;
 
+enum HAL_RuntimeType : int32_t {
+  HAL_Athena,
+  HAL_Mock
+};
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -49,6 +54,7 @@ int32_t HAL_GetFPGAVersion(int32_t* status);
 int64_t HAL_GetFPGARevision(int32_t* status);
 uint64_t HAL_GetFPGATime(int32_t* status);
 
+HAL_RuntimeType HAL_GetRuntimeType();
 HAL_Bool HAL_GetFPGAButton(int32_t* status);
 
 HAL_Bool HAL_GetSystemActive(int32_t* status);

hal/lib/athena/HAL.cpp

@@ -164,6 +164,13 @@ const char* HAL_GetErrorMessage(int32_t code) {
   }
 }
 
+/**
+ * Returns the runtime type of this HAL
+ */
+HAL_RuntimeType HAL_GetRuntimeType() {
+  return HAL_Athena;
+}
+
 /**
  * Return the FPGA Version number.
  * For now, expect this to be competition year.

wpilibj/src/athena/cpp/lib/HALUtil.cpp

@@ -429,6 +429,19 @@ Java_edu_wpi_first_wpilibj_hal_HALUtil_getFPGATime(JNIEnv *env, jclass) {
   return returnValue;
 }
 
+/*
+ * Class:     edu_wpi_first_wpilibj_hal_HALUtil
+ * Method:    getHALRuntimeType
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL
+Java_edu_wpi_first_wpilibj_hal_HALUtil_getHALRuntimeType(JNIEnv *env, jclass) {
+  // HALUTIL_LOG(logDEBUG) << "Calling HALUtil getHALRuntimeType";
+  jint returnValue = HAL_GetRuntimeType();
+  // HALUTIL_LOG(logDEBUG) << "RuntimeType = " << returnValue;
+  return returnValue;
+}
+
 /*
  * Class:     edu_wpi_first_wpilibj_hal_HALUtil
  * Method:    getFPGAButton

wpilibj/src/athena/java/edu/wpi/first/wpilibj/hal/HALUtil.java

@@ -23,6 +23,8 @@ public class HALUtil extends JNIWrapper {
   public static native int getFPGARevision();
 
   public static native long getFPGATime();
+  
+  public static native int getHALRuntimeType();
 
   public static native boolean getFPGAButton();