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/**
* \file
*
* \brief SAM USB Dual Role driver file.
*
* Copyright (C) 2014-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* 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. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include <compiler.h>
#include "usb_dual.h"
#ifndef UDD_ENABLE
# define udc_start()
# define udc_stop()
#else
#include <udc.h>
#endif
#ifndef UHD_ENABLE
# define uhc_start(void)
# define uhc_stop(b_id_stop)
#else
#include <uhc.h>
#endif
/* State of USB dual role initialization */
static bool _initialized = false;
#define _usb_is_id_device() port_pin_get_input_level(USB_ID_PIN)
#if USB_ID_EIC
static void usb_id_handler(void);
/**
* \name USB ID PAD management
*
* @{
*/
/**
* USB ID pin configuration
*/
static void usb_id_config(void)
{
struct extint_chan_conf eint_chan_conf;
extint_chan_get_config_defaults(&eint_chan_conf);
eint_chan_conf.gpio_pin = USB_ID_PIN;
eint_chan_conf.gpio_pin_mux = USB_ID_EIC_MUX;
eint_chan_conf.detection_criteria = EXTINT_DETECT_BOTH;
eint_chan_conf.filter_input_signal = true;
extint_chan_disable_callback(USB_ID_EIC_LINE,
EXTINT_CALLBACK_TYPE_DETECT);
extint_chan_set_config(USB_ID_EIC_LINE, &eint_chan_conf);
extint_register_callback(usb_id_handler,
USB_ID_EIC_LINE,
EXTINT_CALLBACK_TYPE_DETECT);
extint_chan_enable_callback(USB_ID_EIC_LINE,
EXTINT_CALLBACK_TYPE_DETECT);
}
/**
* USB ID pin change handler
*/
static void usb_id_handler(void)
{
extint_chan_disable_callback(USB_ID_EIC_LINE,
EXTINT_CALLBACK_TYPE_DETECT);
if (_usb_is_id_device()) {
uhc_stop(false);
UHC_MODE_CHANGE(false);
udc_start();
} else {
udc_stop();
UHC_MODE_CHANGE(true);
uhc_start();
}
extint_chan_enable_callback(USB_ID_EIC_LINE,
EXTINT_CALLBACK_TYPE_DETECT);
}
#endif
/** @} */
/**
* \brief Initialize the USB peripheral and set right role according to ID pin
*
* \return \c true if the ID pin management has been started, otherwise \c false.
*/
bool usb_dual_enable(void)
{
if (_initialized) {
return false; // Dual role already initialized
}
#if USB_ID_EIC
_initialized = true;
struct port_config pin_conf;
port_get_config_defaults(&pin_conf);
/* Set USB ID Pin as inputs */
pin_conf.direction = PORT_PIN_DIR_INPUT;
pin_conf.input_pull = PORT_PIN_PULL_UP;
port_pin_set_config(USB_ID_PIN, &pin_conf);
usb_id_config();
if (_usb_is_id_device()) {
UHC_MODE_CHANGE(false);
udc_start();
} else {
UHC_MODE_CHANGE(true);
uhc_start();
}
/**
* End of host or device startup,
* the current mode selected is already started now
*/
return true; // ID pin management has been enabled
#else
return false; // ID pin management has not been enabled
#endif
}
/**
* \brief Deinitialize the dual role driver
*/
void usb_dual_disable(void)
{
if (!_initialized) {
return; // Dual role not initialized
}
_initialized = false;
#if USB_ID_EIC
extint_chan_disable_callback(USB_ID_EIC_LINE,
EXTINT_CALLBACK_TYPE_DETECT);
#endif
}
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