allwpilib/hal/lib/shared/HAL.cpp

// This file must compile on ALL PLATFORMS. Be very careful what you put in
// here.
#include "HAL/HAL.h"
#include <cstring>
#include "FRC_NetworkCommunication/FRCComm.h"

struct HALJoystickAxesInt {
  uint16_t count;
  int16_t axes[kMaxJoystickAxes];
};

extern "C" {

int HALGetControlWord(HALControlWord* data) {
  return FRC_NetworkCommunication_getControlWord((ControlWord_t*)data);
}

void HALSetNewDataSem(MULTIWAIT_ID sem) { setNewDataSem(sem->native_handle()); }

int HALGetAllianceStation(enum HALAllianceStationID* allianceStation) {
  return FRC_NetworkCommunication_getAllianceStation(
      (AllianceStationID_t*)allianceStation);
}

int HALGetJoystickAxes(uint8_t joystickNum, HALJoystickAxes* axes) {
  HALJoystickAxesInt axesInt;

  int retVal = FRC_NetworkCommunication_getJoystickAxes(
      joystickNum, (JoystickAxes_t*)&axesInt, kMaxJoystickAxes);

  // copy int values to float values
  axes->count = axesInt.count;
  // current scaling is -128 to 127, can easily be patched in the future by
  // changing this function.
  for (unsigned int i = 0; i < axesInt.count; i++) {
    int8_t value = axesInt.axes[i];
    if (value < 0) {
      axes->axes[i] = value / 128.0f;
    } else {
      axes->axes[i] = value / 127.0f;
    }
  }

  return retVal;
}

int HALGetJoystickPOVs(uint8_t joystickNum, HALJoystickPOVs* povs) {
  return FRC_NetworkCommunication_getJoystickPOVs(
      joystickNum, (JoystickPOV_t*)povs, kMaxJoystickPOVs);
}

int HALGetJoystickButtons(uint8_t joystickNum, HALJoystickButtons* buttons) {
  return FRC_NetworkCommunication_getJoystickButtons(
      joystickNum, &buttons->buttons, &buttons->count);
}
/**
 * Retrieve the Joystick Descriptor for particular slot
 * @param desc [out] descriptor (data transfer object) to fill in.  desc is
 * filled in regardless of success. In other words, if descriptor is not
 * available, desc is filled in with default values matching the init-values in
 * Java and C++ Driverstation for when caller requests a too-large joystick
 * index.
 *
 * @return error code reported from Network Comm back-end.  Zero is good,
 * nonzero is bad.
 */
int HALGetJoystickDescriptor(uint8_t joystickNum, HALJoystickDescriptor* desc) {
  desc->isXbox = 0;
  desc->type = -1;
  desc->name[0] = '\0';
  desc->axisCount =
      kMaxJoystickAxes; /* set to the desc->axisTypes's capacity */
  desc->buttonCount = 0;
  desc->povCount = 0;
  int retval = FRC_NetworkCommunication_getJoystickDesc(
      joystickNum, &desc->isXbox, &desc->type, (char*)(&desc->name),
      &desc->axisCount, (uint8_t*)&desc->axisTypes, &desc->buttonCount,
      &desc->povCount);
  /* check the return, if there is an error and the RIOimage predates FRC2017,
   * then axisCount needs to be cleared */
  if (retval != 0) {
    /* set count to zero so downstream code doesn't decode invalid axisTypes. */
    desc->axisCount = 0;
  }
  return retval;
}

int HALGetJoystickIsXbox(uint8_t joystickNum) {
  HALJoystickDescriptor joystickDesc;
  if (HALGetJoystickDescriptor(joystickNum, &joystickDesc) < 0) {
    return 0;
  } else {
    return joystickDesc.isXbox;
  }
}

int HALGetJoystickType(uint8_t joystickNum) {
  HALJoystickDescriptor joystickDesc;
  if (HALGetJoystickDescriptor(joystickNum, &joystickDesc) < 0) {
    return -1;
  } else {
    return joystickDesc.type;
  }
}

char* HALGetJoystickName(uint8_t joystickNum) {
  HALJoystickDescriptor joystickDesc;
  if (HALGetJoystickDescriptor(joystickNum, &joystickDesc) < 0) {
    char* name = (char*)std::malloc(1);
    name[0] = '\0';
    return name;
  } else {
    size_t len = std::strlen(joystickDesc.name);
    char* name = (char*)std::malloc(len + 1);
    std::strcpy(name, joystickDesc.name);
    return name;
  }
}

int HALGetJoystickAxisType(uint8_t joystickNum, uint8_t axis) {
  HALJoystickDescriptor joystickDesc;
  if (HALGetJoystickDescriptor(joystickNum, &joystickDesc) < 0) {
    return -1;
  } else {
    return joystickDesc.axisTypes[axis];
  }
}

int HALSetJoystickOutputs(uint8_t joystickNum, uint32_t outputs,
                          uint16_t leftRumble, uint16_t rightRumble) {
  return FRC_NetworkCommunication_setJoystickOutputs(joystickNum, outputs,
                                                     leftRumble, rightRumble);
}

int HALGetMatchTime(float* matchTime) {
  return FRC_NetworkCommunication_getMatchTime(matchTime);
}

void HALNetworkCommunicationObserveUserProgramStarting(void) {
  FRC_NetworkCommunication_observeUserProgramStarting();
}

void HALNetworkCommunicationObserveUserProgramDisabled(void) {
  FRC_NetworkCommunication_observeUserProgramDisabled();
}

void HALNetworkCommunicationObserveUserProgramAutonomous(void) {
  FRC_NetworkCommunication_observeUserProgramAutonomous();
}

void HALNetworkCommunicationObserveUserProgramTeleop(void) {
  FRC_NetworkCommunication_observeUserProgramTeleop();
}

void HALNetworkCommunicationObserveUserProgramTest(void) {
  FRC_NetworkCommunication_observeUserProgramTest();
}

}  // extern "C"