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Add support for USB device testing on the PIC32 starter kit
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4463 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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patacongo
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/************************************************************************************
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* configs/pic32-starterkit/src/up_usbdev.c
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* arch/arm/src/board/up_usbdev.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <nuttx/usb/usbdev.h>
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#include "pic32mx-internal.h"
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#include "starterkit_internal.h"
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#if defined(CONFIG_PIC32MX_USBDEV)
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/*
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* PIN NAME SIGNAL NOTES
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* ---- ------------------------------- -------------- ------------------------------
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* 20 VBUSON/C1IN+/AN5/CN7/RB5 VBUSON To USB VBUS circuitry
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* 43 C2IN+/AN3/CN5/RB3 USB_PGOOD Power good (low if bad)
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*/
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#define GPIO_USB_VBUSON (GPIO_INPUT|GPIO_PORTB|GPIO_PIN5)
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#define GPIO_USB_PGOOD (GPIO_INPUT|GPIO_PORTB|GPIO_PIN3)
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: pic32mx_usbdevinitialize
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*
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* Description:
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* Called to configure the mini-A/B J5 on the PIC32 Ethernet Starter Kit for the
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* USB device
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*
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************************************************************************************/
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void weak_function pic32mx_usbdevinitialize(void)
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{
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/* Connect the PHY to the USB mini-B port. Order and timing matter! */
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pic32mx_configgpio(GPIO_USB_PGOOD);
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/* Notes from the Sure Electronics sample code:
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*
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* "The USB specifications require that USB peripheral devices must never source
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* current onto the Vbus pin. Additionally, USB peripherals should not source
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* current on D+ or D- when the host/hub is not actively powering the Vbus line.
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* When designing a self powered (as opposed to bus powered) USB peripheral
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* device, the firmware should make sure not to turn on the USB module and D+
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* or D- pull up resistor unless Vbus is actively powered. Therefore, the
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* firmware needs some means to detect when Vbus is being powered by the host.
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* A 5V tolerant I/O pin can be connected to Vbus (through a resistor), and
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* can be used to detect when Vbus is high (host actively powering), or low
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* (host is shut down or otherwise not supplying power). The USB firmware
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* can then periodically poll this I/O pin to know when it is okay to turn on
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* the USB module/D+/D- pull up resistor. When designing a purely bus powered
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* peripheral device, it is not possible to source current on D+ or D- when the
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* host is not actively providing power on Vbus. Therefore, implementing this
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* bus sense feature is optional. ..."
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*/
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#ifdef CONFIG_USBHOST
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// pic32mx_configgpio(GPIO_USB_VBUSON);
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#endif
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/* "If the host PC sends a GetStatus (device) request, the firmware must respond
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* and let the host know if the USB peripheral device is currently bus powered
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* or self powered. See chapter 9 in the official USB specifications for details
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* regarding this request. If the peripheral device is capable of being both
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* self and bus powered, it should not return a hard coded value for this request.
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* Instead, firmware should check if it is currently self or bus powered, and
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* respond accordingly. If the hardware has been configured like demonstrated
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* on the PICDEM FS USB Demo Board, an I/O pin can be polled to determine the
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* currently selected power source. ..."
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*/
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#ifdef CONFIG_USB_PWRSENSE
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// pic32mx_configgpio(GPIO_USB_PWRSENSE);
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#endif
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}
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/************************************************************************************
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* Name: pic32mx_usbpullup
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*
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* Description:
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* If USB is supported and the board supports a pullup via GPIO (for USB
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* software connect and disconnect), then the board software must provide
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* stm32_pullup. See include/nuttx/usb/usbdev.h for additional description
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* of this method. Alternatively, if no pull-up GPIO the following EXTERN
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* can be redefined to be NULL.
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*
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************************************************************************************/
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int pic32mx_usbpullup(FAR struct usbdev_s *dev, bool enable)
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{
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/* The PIC32 Ethernet Starter Kit does not have a USB pull-up */
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return OK;
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}
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/************************************************************************************
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* Name: pic32mx_usbsuspend
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*
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* Description:
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* Board logic must provide the stm32_usbsuspend logic if the USBDEV driver
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* is used. This function is called whenever the USB enters or leaves
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* suspend mode. This is an opportunity for the board logic to shutdown
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* clocks, power, etc. while the USB is suspended.
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*
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************************************************************************************/
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void pic32mx_usbsuspend(FAR struct usbdev_s *dev, bool resume)
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{
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/* Do nothing */
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}
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#endif /* CONFIG_PIC32MX_USBDEV */
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