PX4-Autopilot/boards/px4/fmu-v6xrt/src/usb.c

/****************************************************************************
 *
 *   Copyright (C) 2016, 2018 PX4 Development Team. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/**
 * @file usb.c
 *
 * Board-specific USB functions.
 */

/************************************************************************************
 * Included Files
 ************************************************************************************/

#include <px4_platform_common/px4_config.h>

#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <debug.h>

#include <nuttx/usb/usbdev.h>
#include <nuttx/usb/usbdev_trace.h>

#include <arm_internal.h>
#include <chip.h>
#include <hardware/imxrt_usb_analog.h>
#include "board_config.h"
#include "imxrt_periphclks.h"

/************************************************************************************
 * Definitions
 ************************************************************************************/

/************************************************************************************
 * Private Functions
 ************************************************************************************/

/************************************************************************************
 * Public Functions
 ************************************************************************************/
int imxrt_usb_initialize(void)
{
	imxrt_clockall_usboh3();
	return 0;
}
/************************************************************************************
 * Name:  imxrt_usbpullup
 *
 * Description:
 *   If USB is supported and the board supports a pullup via GPIO (for USB software
 *   connect and disconnect), then the board software must provide imxrt_usbpullup.
 *   See include/nuttx/usb/usbdev.h for additional description of this method.
 *   Alternatively, if no pull-up GPIO the following EXTERN can be redefined to be
 *   NULL.
 *
 ************************************************************************************/

__EXPORT
int imxrt_usbpullup(FAR struct usbdev_s *dev, bool enable)
{
	usbtrace(TRACE_DEVPULLUP, (uint16_t)enable);

	return OK;
}

/************************************************************************************
 * Name:  imxrt_usbsuspend
 *
 * Description:
 *   Board logic must provide the imxrt_usbsuspend logic if the USBDEV driver is
 *   used.  This function is called whenever the USB enters or leaves suspend mode.
 *   This is an opportunity for the board logic to shutdown clocks, power, etc.
 *   while the USB is suspended.
 *
 ************************************************************************************/

__EXPORT
void imxrt_usbsuspend(FAR struct usbdev_s *dev, bool resume)
{
	uinfo("resume: %d\n", resume);
}

/************************************************************************************
 * Name: board_read_VBUS_state
 *
 * Description:
 *   All boards must provide a way to read the state of VBUS, this my be simple
 *   digital input on a GPIO. Or something more complicated like a Analong input
 *   or reading a bit from a USB controller register.
 *
 * Returns -  0 if connected.
 *
 ************************************************************************************/
#undef IMXRT_USB_ANALOG_USB1_VBUS_DETECT_STAT
#define USB1_VBUS_DET_STAT_OFFSET               0xd0
#define IMXRT_USB_ANALOG_USB1_VBUS_DETECT_STAT (IMXRT_USBPHY1_BASE + USB1_VBUS_DET_STAT_OFFSET)

int board_read_VBUS_state(void)
{
	return (getreg32(IMXRT_USB_ANALOG_USB1_VBUS_DETECT_STAT) & USB_ANALOG_USB_VBUS_DETECT_STAT_VBUS_3V_VALID) ? 0 : 1;
}