stm32/can: Guard header file by MICROPY_HW_ENABLE_CAN.
Because not all MCU series have a CAN peripheral.
#include "py/obj.h"
+#if MICROPY_HW_ENABLE_CAN
+
#define PYB_CAN_1 (1)
#define PYB_CAN_2 (2)
#define PYB_CAN_3 (3)
@@ -86,4 +88,6 @@ int can_receive(CAN_HandleTypeDef *can, int fifo, CanRxMsgTypeDef *msg, uint8_t
HAL_StatusTypeDef CAN_Transmit(CAN_HandleTypeDef *hcan, uint32_t Timeout);
void pyb_can_handle_callback(pyb_can_obj_t *self, uint fifo_id, mp_obj_t callback, mp_obj_t irq_reason);
+#endif // MICROPY_HW_ENABLE_CAN
+
#endif // MICROPY_INCLUDED_STM32_CAN_H
