[hal] Initial SystemCore empty HAL (#7454)

hal/src/main/native/systemcore/CAN.cpp

@@ -0,0 +1,47 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include "hal/CAN.h"
+
+#include "hal/Errors.h"
+
+namespace hal::init {
+void InitializeCAN() {}
+}  // namespace hal::init
+
+extern "C" {
+
+void HAL_CAN_SendMessage(uint32_t messageID, const uint8_t* data,
+                         uint8_t dataSize, int32_t periodMs, int32_t* status) {
+  *status = HAL_HANDLE_ERROR;
+  return;
+}
+void HAL_CAN_ReceiveMessage(uint32_t* messageID, uint32_t messageIDMask,
+                            uint8_t* data, uint8_t* dataSize,
+                            uint32_t* timeStamp, int32_t* status) {
+  *status = HAL_HANDLE_ERROR;
+  return;
+}
+void HAL_CAN_OpenStreamSession(uint32_t* sessionHandle, uint32_t messageID,
+                               uint32_t messageIDMask, uint32_t maxMessages,
+                               int32_t* status) {
+  *sessionHandle = 0;
+  *status = HAL_HANDLE_ERROR;
+  return;
+}
+void HAL_CAN_CloseStreamSession(uint32_t sessionHandle) {}
+void HAL_CAN_ReadStreamSession(uint32_t sessionHandle,
+                               struct HAL_CANStreamMessage* messages,
+                               uint32_t messagesToRead, uint32_t* messagesRead,
+                               int32_t* status) {
+  *status = HAL_HANDLE_ERROR;
+  return;
+}
+void HAL_CAN_GetCANStatus(float* percentBusUtilization, uint32_t* busOffCount,
+                          uint32_t* txFullCount, uint32_t* receiveErrorCount,
+                          uint32_t* transmitErrorCount, int32_t* status) {
+  *status = HAL_HANDLE_ERROR;
+  return;
+}
+}  // extern "C"