From c241dbd7e78c50327781a35d88d9f2db7ff2b271 Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Mon, 29 Oct 2012 23:08:53 +0200 Subject: Added usblib --- usblib/usbmode.c | 1115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1115 insertions(+) create mode 100644 usblib/usbmode.c (limited to 'usblib/usbmode.c') diff --git a/usblib/usbmode.c b/usblib/usbmode.c new file mode 100644 index 0000000..10ece23 --- /dev/null +++ b/usblib/usbmode.c @@ -0,0 +1,1115 @@ +//***************************************************************************** +// +// usbmode.c - Functions related to dual mode USB device/host operation. +// +// Copyright (c) 2008-2012 Texas Instruments Incorporated. All rights reserved. +// Software License Agreement +// +// Texas Instruments (TI) is supplying this software for use solely and +// exclusively on TI's microcontroller products. The software is owned by +// TI and/or its suppliers, and is protected under applicable copyright +// laws. You may not combine this software with "viral" open-source +// software in order to form a larger program. +// +// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS. +// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT +// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY +// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL +// DAMAGES, FOR ANY REASON WHATSOEVER. +// +// This is part of revision 9453 of the Stellaris USB Library. +// +//***************************************************************************** + +#include "inc/hw_ints.h" +#include "inc/hw_memmap.h" +#include "inc/hw_types.h" +#include "inc/hw_usb.h" +#include "driverlib/debug.h" +#include "driverlib/interrupt.h" +#include "driverlib/rom.h" +#include "driverlib/rom_map.h" +#include "driverlib/sysctl.h" +#include "driverlib/usb.h" +#include "driverlib/rtos_bindings.h" +#include "usblib/usblib.h" +#include "usblib/device/usbdevice.h" +#include "usblib/host/usbhost.h" +#include "usblib/usblibpriv.h" + +//***************************************************************************** +// +//! \addtogroup general_usblib_api +//! @{ +// +//***************************************************************************** + +//***************************************************************************** +// +// The following label defines interrupts that we will always pass to the host +// interrupt handler even if we are in dual mode and not yet sure of which +// mode we are operating in. +// +//***************************************************************************** +#define USB_HOST_INTS (USB_INTCTRL_VBUS_ERR) + +//***************************************************************************** +// +// Global variable indicating which mode of operation the application has +// requested. +// +//***************************************************************************** +volatile tUSBMode g_eUSBMode = USB_MODE_NONE; + +//***************************************************************************** +// +// The default and the current polling rate for the USB OTG library. +// +//***************************************************************************** +volatile unsigned long g_ulPollRate; + +//***************************************************************************** +// +// The current time remaining in milliseconds before checking the cable +// connection. +// +//***************************************************************************** +volatile unsigned long g_ulWaitTicks = 0; + +//***************************************************************************** +// +// This enum holds the various states that we can be in while performing +// USB mode checking. This involves use of the OTG session request to poll +// the USB ID pin to determine whether a device or a host is connected. +// +//***************************************************************************** +typedef enum +{ + // + // No checking is currently pending. + // + USB_OTG_MODE_IDLE, + + // + // Waiting on ID mode detection. + // + USB_OTG_MODE_WAITID, + + // + // Waiting for next poll interval. + // + USB_OTG_MODE_WAIT, + + // + // Now in B-side wait for connect. + // + USB_OTG_MODE_B_WAITCON, + + // + // Now in A-side device mode. + // + USB_OTG_MODE_B_DEVICE, + + // + // Now in A-side host mode. + // + USB_OTG_MODE_A_HOST, +} +tUSBOTGState; + +volatile tUSBOTGState g_eOTGModeState; + +//***************************************************************************** +// +// Global variable indicating whether we are currently operating in host or +// device mode if the user has requested Dual mode operation. +// +//***************************************************************************** +static volatile tUSBMode g_eDualMode = USB_MODE_NONE; + +static void USBOTGRemovePower(unsigned long ulIndex); + +//***************************************************************************** +// +// Global variable holding a pointer to the callback function which will be +// called when the USB mode changes between device and host. +// +//***************************************************************************** +static tUSBModeCallback g_pfnUSBModeCallback; + +//***************************************************************************** +// +// This function is used to handle switching between host, device and +// unconfigured modes. +// +// /param eUSBMode is one of USB_MODE_HOST, USB_MODE_DEVICE, or USB_MODE_NONE. +// +// Based on the current state held in g_eDualMode variable this function will +// handle the transition of the mode of operation in OTG mode and calling +// the callback function if it is present. +// +// /return None. +// +//***************************************************************************** +static void +USBOTGSetMode(tUSBMode eUSBMode) +{ + if((g_eDualMode != eUSBMode) || (g_eDualMode == USB_MODE_NONE)) + { + // + // If going from host mode to unconfigured mode then remove power. + // + if((g_eDualMode == USB_MODE_HOST) && (eUSBMode == USB_MODE_NONE)) + { + // + // Take the steps to remove power in the of host mode OTG. + // + USBOTGRemovePower(0); + } + + // + // If going from device mode to unconfigured mode then end the current + // session. + // + if((g_eDualMode == USB_MODE_DEVICE) && (eUSBMode == USB_MODE_NONE)) + { + // + // End the current session. + // + USBOTGSessionRequest(USB0_BASE, false); + } + + // + // Reset the delay whenever returning to USB_MODE_NONE. + // + if(eUSBMode == USB_MODE_NONE) + { + g_ulWaitTicks = g_ulPollRate; + } + + // + // Do we have a mode change callback installed? + // + if((g_pfnUSBModeCallback) && (g_eDualMode != eUSBMode)) + { + // + // Inform the callback of the new operating mode. + // + g_pfnUSBModeCallback(0, eUSBMode); + } + + // + // Save the new mode. + // + g_eDualMode = eUSBMode; + } +} + +//***************************************************************************** +// +//! Allows dual mode application to switch between USB device and host modes +//! and provides a method to force the controller into the desired mode. +//! +//! \param ulIndex specifies the USB controller whose mode of operation is to +//! be set. This parameter must be set to 0. +//! \param eUSBMode indicates the mode that the application wishes to operate +//! in. Valid values are \b USB_MODE_DEVICE to operate as a USB device and +//! \b USB_MODE_HOST to operate as a USB host. +//! \param pfnCallback is a pointer to a function which the USB library will +//! call each time the mode is changed to indicate the new operating mode. In +//! cases where \e eUSBMode is set to either \b USB_MODE_DEVICE or +//! \b USB_MODE_HOST, the callback will be made immediately to allow the +//! application to perform any host or device specific initialization. +//! +//! This function allows a USB application that can operate in host +//! or device mode to indicate to the USB stack the mode that it wishes to +//! use. The caller is responsible for cleaning up the interface and removing +//! itself from the bus prior to making this call and reconfiguring afterwards. +//! The \e pfnCallback function can be a NULL(0) value to indicate that no +//! notification is required. +//! +//! For successful dual mode mode operation, an application must register +//! USB0DualModeIntHandler() as the interrupt handler for the USB0 interrupt. +//! This handler is responsible for steering interrupts to the device or host +//! stack depending upon the chosen mode. Devices which do not require dual +//! mode capability should register either \e USB0DeviceIntHandler() or +//! \e USB0HostIntHandler() instead. Registering \e USB0DualModeIntHandler() +//! for a single mode application will result in an application binary larger +//! than required since library functions for both USB operating modes will be +//! included even though only one mode is required. +//! +//! Single mode applications (those offering exclusively USB device or USB +//! host functionality) are only required to call this function if they need to +//! force the mode of the controller to Host or Device mode. This is usually +//! in the event that the application needs to reused the USBVBUS and/or USBID +//! pins as GPIOs. +//! +//! \note Forcing of the USB controller mode feature is not available on all +//! Stellaris microcontrollers. Consult the data sheet for the microcontroller +//! that the application is using to determine if this feature is available. +//! +//! \return None. +// +//***************************************************************************** +void +USBStackModeSet(unsigned long ulIndex, tUSBMode eUSBMode, + tUSBModeCallback pfnCallback) +{ + // + // Check the arguments. + // + ASSERT(ulIndex == 0); + + // + // Remember the mode so that we can steer the interrupts appropriately. + // + g_eUSBMode = eUSBMode; + + // + // Remember the callback pointer. + // + g_pfnUSBModeCallback = pfnCallback; + + // + // If we are being asked to be either a host or device, we will not be + // trying to auto-detect the mode so make the callback immediately. + // + if((eUSBMode == USB_MODE_DEVICE) || (eUSBMode == USB_MODE_HOST)) + { + // + // Make sure that a callback was provided. + // + if(g_pfnUSBModeCallback) + { + g_pfnUSBModeCallback(0, eUSBMode); + } + } +} + +//***************************************************************************** +// +//! Steers USB interrupts from controller to the correct handler in the USB +//! stack. +//! +//! This interrupt handler is used in applications which require to operate +//! in both host and device mode. It steers the USB hardware interrupt to the +//! correct handler in the USB stack depending upon the current operating mode +//! of the application, USB device or host. +//! +//! For successful dual mode operation, an application must register +//! USB0DualModeIntHandler() in the CPU vector table as the interrupt handler +//! for the USB0 interrupt. This handler is responsible for steering +//! interrupts to the device or host stack depending upon the chosen mode. +//! +//! \note Devices which do not require dual mode capability should register +//! either USB0DeviceIntHandler() or USB0HostIntHandler() instead. Registering +//! USB0DualModeIntHandler() for a single mode application will result in an +//! application binary larger than required since library functions for both +//! USB operating modes will be included even though only one mode is actually +//! required. +//! +//! \return None. +// +//***************************************************************************** +void +USB0DualModeIntHandler(void) +{ + unsigned long ulStatus; + + // + // Read the USB interrupt status. + // + ulStatus = USBIntStatusControl(USB0_BASE); + + // + // Pass through the subset of interrupts that we always want + // the host stack to see regardless of whether or not we + // are actually in host mode at this point. + // + if(ulStatus & USB_HOST_INTS) + { + // + // Call the host's interrupt handler. + // + USBHostIntHandlerInternal(0, ulStatus & USB_HOST_INTS); + + // + // We have already processed these interrupts so clear them + // from the status. + // + ulStatus &= ~USB_HOST_INTS; + } + + // + // Steer the interrupt to the appropriate handler within the stack + // depending upon our current operating mode. Note that we need to pass + // the ulStatus parameter since the USB interrupt register is + // clear-on-read. + // + switch(g_eUSBMode) + { + case USB_MODE_NONE: + { + // + // No mode is set yet so we have no idea what to do. Just ignore + // the interrupt. + // + break; + } + + // + // Operating in pure host mode. + // + case USB_MODE_HOST: + { + // + // Call the host interrupt handler if there is anything still to + // process. + // + USBHostIntHandlerInternal(0, ulStatus); + + break; + } + + // + // Operating in pure device mode. + // + case USB_MODE_DEVICE: + { + // + // Call the device interrupt handler. + // + USBDeviceIntHandlerInternal(0, ulStatus); + + break; + } + + default: + { + break; + } + } +} + +//***************************************************************************** +// +//! Initializes the USB controller for dual mode operation. +//! +//! \param ulIndex specifies the USB controller that is to be initialized for +//! dual mode operation. This parameter must be set to 0. +//! +//! This function initializes the USB controller hardware into a state +//! suitable for dual mode operation. Applications may use this function to +//! ensure that the controller is in a neutral state and able to receive +//! appropriate interrupts before host or device mode is chosen using a call +//! to USBStackModeSet(). +//! +//! \return None. +// +//***************************************************************************** +void +USBDualModeInit(unsigned long ulIndex) +{ + // + // We only support a single USB controller. + // + ASSERT(ulIndex == 0); + + // + // Configure the End point 0. + // + USBHostEndpointConfig(USB0_BASE, USB_EP_0, 64, 0, 0, + (USB_EP_MODE_CTRL | USB_EP_SPEED_FULL | + USB_EP_HOST_OUT)); + + // + // Enable USB Interrupts. + // + MAP_USBIntEnableControl(USB0_BASE, USB_INTCTRL_RESET | + USB_INTCTRL_DISCONNECT | + USB_INTCTRL_SESSION | + USB_INTCTRL_BABBLE | + USB_INTCTRL_CONNECT | + USB_INTCTRL_RESUME | + USB_INTCTRL_SUSPEND | + USB_INTCTRL_VBUS_ERR); + + // + // Enable all endpoint interrupts. + // + MAP_USBIntEnableEndpoint(USB0_BASE, USB_INTEP_ALL); + + // + // Initialize the USB tick module. + // + InternalUSBTickInit(); + + // + // Enable the USB interrupt. + // + OS_INT_ENABLE(INT_USB0); + + // + // Turn on session request to enable ID pin checking. + // + USBOTGSessionRequest(USB0_BASE, true); + + // + // Initialize the power configuration. + // + USBHostPwrConfig(USB0_BASE, USBHCDPowerConfigGet(ulIndex)); + + // + // If power enable is automatic then then USBHostPwrEnable() has to be + // called to allow the USB controller to control the power enable pin. + // + if(USBHCDPowerAutomatic(ulIndex)) + { + // + // This will not turn on power but instead will allow the USB + // controller to turn on power when needed. + // + USBHostPwrEnable(USB0_BASE); + } +} + +//***************************************************************************** +// +//! Returns the USB controller to the default mode when in dual mode operation. +//! +//! \param ulIndex specifies the USB controller whose dual mode operation is to +//! be ended. This parameter must be set to 0. +//! +//! Applications using both host and device modes may call this function to +//! disable interrupts in preparation for shutdown or a change of operating +//! mode. +//! +//! \return None. +// +//***************************************************************************** +void +USBDualModeTerm(unsigned long ulIndex) +{ + // + // We only support a single USB controller. + // + ASSERT(ulIndex == 0); + + // + // Disable the USB interrupt. + // + OS_INT_DISABLE(INT_USB0); + + MAP_USBIntDisableControl(USB0_BASE, USB_INTCTRL_ALL); + + MAP_USBIntDisableEndpoint(USB0_BASE, USB_INTEP_ALL); +} + +//***************************************************************************** +// +// Close the Doxygen group. +//! @} +// +//***************************************************************************** +//***************************************************************************** +// +//! \addtogroup usblib_otg +//! @{ +// +//***************************************************************************** + + +//***************************************************************************** +// +//! Returns the USB controller to and inactive state when in OTG mode operation. +//! +//! \param ulIndex specifies the USB controller to end OTG mode operations. +//! +//! Applications using OTG mode may call this function to disable interrupts +//! in preparation for shutdown or a change of operating mode. +//! +//! \return None. +// +//***************************************************************************** +void +USBOTGModeTerm(unsigned long ulIndex) +{ + // + // We only support a single USB controller. + // + ASSERT(ulIndex == 0); + + // + // Disable the USB interrupt. + // + OS_INT_DISABLE(INT_USB0); + + // + // Disable all control interrupts. + // + MAP_USBIntDisableControl(USB0_BASE, USB_INTCTRL_ALL); + + // + // Disable all endpoint interrupts. + // + MAP_USBIntDisableEndpoint(USB0_BASE, USB_INTEP_ALL); + + // + // Set the mode to none if it is not already. + // + USBOTGSetMode(USB_MODE_NONE); +} + +//***************************************************************************** +// +//! Initializes the USB controller for OTG mode operation. +//! +//! \param ulIndex specifies the USB controller that is to be initialized for +//! OTG mode operation. +//! \param ulPollingRate is the rate in milliseconds to poll the controller +//! for changes in mode. +//! \param pvPool is a pointer to the data to use as a memory pool for this +//! controller. +//! \param ulPoolSize is the size in bytes of the buffer passed in as pvPool. +//! +//! This function initializes the USB controller hardware into a state +//! suitable for OTG mode operation. Applications must use this function to +//! ensure that the controller is in a neutral state and able to receive +//! appropriate interrupts before host or device mode is chosen by OTG +//! negotiation. The \e ulPollingRate parameter is used to set the rate at +//! which the USB library will poll the controller to determine the mode. This +//! has the most effect on how quickly the USB library will detect changes when +//! going to host mode. The parameters \e pvPool and \e ulPoolSize are passed +//! on to the USB host library functions to provide memory for the USB library +//! when it is acting as a host. Any device and host initialization should have +//! been called before calling this function to prevent the USB library from +//! attempting to run in device or host mode before the USB library is +//! fully configured. +//! +//! \return None. +// +//***************************************************************************** +void +USBOTGModeInit(unsigned long ulIndex, unsigned long ulPollingRate, + void *pvPool, unsigned long ulPoolSize) +{ + // + // We only support a single USB controller. + // + ASSERT(ulIndex == 0); + + // + // This should never be called if not in OTG mode. + // + ASSERT(g_eUSBMode == USB_MODE_OTG); + + // + // Force OTG mode in all cases since anything else is invalid, but a DEBUG + // build will still ASSERT above if this value is incorrect. + // + g_eUSBMode = USB_MODE_OTG; + + // + // Remember that we have not yet determined whether we are device or + // host. + // + g_eDualMode = USB_MODE_NONE; + + // + // Set the default polling rate. + // + g_ulPollRate = ulPollingRate; + + // + // Enable the USB controller. + // + MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_USB0); + + // + // Turn on USB Phy clock. + // + MAP_SysCtlUSBPLLEnable(); + + // + // Initialize the host controller stack. + // + USBHCDInit(ulIndex, pvPool, ulPoolSize); + + // + // Configure the End point 0. + // + USBHostEndpointConfig(USB0_BASE, USB_EP_0, 64, 0, 0, + (USB_EP_MODE_CTRL | USB_EP_SPEED_FULL | + USB_EP_HOST_OUT)); + + // + // Enable control interrupts. + // + MAP_USBIntEnableControl(USB0_BASE, USB_INTCTRL_RESET | + USB_INTCTRL_DISCONNECT | + USB_INTCTRL_SESSION | + USB_INTCTRL_BABBLE | + USB_INTCTRL_CONNECT | + USB_INTCTRL_RESUME | + USB_INTCTRL_SUSPEND | + USB_INTCTRL_VBUS_ERR | + USB_INTCTRL_MODE_DETECT | + USB_INTCTRL_SOF); + + // + // Make sure the mode OTG mode and not forced device or host. + // + USBOTGMode(USB0_BASE); + + // + // Enable all endpoint interrupts. + // + MAP_USBIntEnableEndpoint(USB0_BASE, USB_INTEP_ALL); + + // + // Initialize the power configuration. + // + USBHCDPowerConfigSet(ulIndex, USBHCDPowerConfigGet(ulIndex)); + + // + // If power enable is automatic then then USBHostPwrEnable() has to be + // called to allow the USB controller to control the power enable pin. + // + if(USBHCDPowerAutomatic(ulIndex)) + { + // + // This will not turn on power but instead will allow the USB + // controller to turn on power when needed. + // + USBHostPwrEnable(USB0_BASE); + } + + // + // Enable the USB interrupt. + // + OS_INT_ENABLE(INT_USB0); +} + +//***************************************************************************** +// +// This function handles the steps required to remove power in OTG mode. +// +// \param ulIndex specifies which USB controller should remove power. +// +// This function will perform the steps required to remove power from the USB +// bus as required by the OTG specification. This call will first issue a +// bus suspend followed by clearing the current session and then removing power. +// +// /return None. +// +//***************************************************************************** +static void +USBOTGRemovePower(unsigned long ulIndex) +{ + tEventInfo sEvent; + + // + // Do suspend signaling. + // + USBHostSuspend(USB0_BASE); + + // + // End the session in either device or host mode. + // + USBOTGSessionRequest(USB0_BASE, false); + + // + // Check if the controller is automatically applying power or not. + // + if(USBHCDPowerAutomatic(ulIndex) == 0) + { + // + // Call the registered event driver to allow it to disable power. + // + sEvent.ulEvent = USB_EVENT_POWER_DISABLE; + sEvent.ulInstance = 0; + InternalUSBHCDSendEvent(0, &sEvent, USBHCD_EVFLAG_PWRDIS); + } +} + +//***************************************************************************** +// +//! This call sets the USB OTG controllers poll rate when checking for the mode +//! of the controller. +//! +//! \param ulIndex specifies which USB controller to set the polling rate. +//! \param ulPollRate is the rate in milliseconds to poll for changes in the +//! controller mode. +//! +//! This function is called to set the USB OTG libraries polling rate when +//! checking the status of the cable. The \e ulPollRate value used sets the +//! rate in milliseconds that the USB OTG library will poll the cable to see +//! if the controller should enter host mode. This value has no effect on +//! device detection rate as the controller will detect being connected to a +//! host controller automatically. The \e ulPollRate can be set to 0 to +//! disable polling. The USB OTG library can still function with the polling +//! rate set to zero, however it will fail to detect host mode properly when no +//! device is present at the end of the USB OTG B side of the cable. +//! +//! \note This function should only be called on devices that support OTG +//! functionality. +//! +//! \return None. +// +//***************************************************************************** +void +USBOTGPollRate(unsigned long ulIndex, unsigned long ulPollRate) +{ + // + // Save the timeout. + // + g_ulPollRate = ulPollRate; +} + +//***************************************************************************** +// +//! Handles OTG mode changes and also steers other USB interrupts from +//! the controller to the correct handler in the USB stack. +//! +//! This interrupt handler is used in applications which require to operate +//! in both host and device mode using OTG. When in host or device mode, it +//! steers the USB hardware interrupt to the correct handler in the USB stack +//! depending upon the current operating mode. It also handles other OTG +//! related interrupt events. +//! +//! For successful OTG mode operation, an application must register +//! USB0OTGModeIntHandler() in the CPU vector table as the interrupt handler +//! for the USB0 interrupt. +//! +//! \note This interrupt handler should only be used on controllers that support +//! OTG functionality. +//! +//! \return None. +// +//***************************************************************************** +void +USB0OTGModeIntHandler(void) +{ + unsigned long ulStatus; + tEventInfo sEvent; + + // + // Read the USB interrupt status. + // + ulStatus = USBIntStatusControl(USB0_BASE); + + // + // Check if this was an mode detect interrupt and under manual power + // control. + // + if((ulStatus & USB_INTCTRL_MODE_DETECT) && + (USBHCDPowerAutomatic(0) == 0)) + { + unsigned long ulMode; + + ulMode = USBModeGet(USB0_BASE); + + switch(ulMode) + { + // + // Device is on the A side of the cable and power needs to be + // applied. + // + case USB_OTG_MODE_ASIDE_NPWR: + case USB_OTG_MODE_ASIDE_SESS: + case USB_OTG_MODE_ASIDE_AVAL: + { + // + // Since power is not automatically enabled, call the + // registered event handler to allow the application to turn + // on power. + // + sEvent.ulEvent = USB_EVENT_POWER_ENABLE; + sEvent.ulInstance = 0; + InternalUSBHCDSendEvent(0, &sEvent, USBHCD_EVFLAG_PWREN); + + break; + } + + // + // Device is on the B side of the cable and powered. + // + case USB_OTG_MODE_BSIDE_DEV: + { + // + // Now in device mode on the B side of the cable and will wait + // for a connect before becoming a device. + // + g_eOTGModeState = USB_OTG_MODE_B_WAITCON; + + break; + } + + // + // Any other mode detect indicates USB_MODE_NONE. + // + default: + { + // + // Just inform the application that the mode was not device + // or host. + // + USBOTGSetMode(USB_MODE_NONE); + + break; + } + } + } + + // + // If there was a VBUS error then the power should be shut off and the system + // is reset to waiting for detection again. + // + if(ulStatus & USB_INTCTRL_VBUS_ERR) + { + // + // Just inform the application that the mode was not device + // or host. + // + USBOTGSetMode(USB_MODE_NONE); + + // + // Return to idle mode. + // + g_eOTGModeState = USB_OTG_MODE_WAIT; + } + + // + // If there is a disconnect interrupt and the controller was on the B side + // cable as a device then go back to the IDLE state. + // + if((ulStatus & USB_INTCTRL_DISCONNECT) && + (g_eOTGModeState == USB_OTG_MODE_B_DEVICE)) + { + // + // No longer a device so switch to unconfigured mode. + // + USBOTGSetMode(USB_MODE_NONE); + + // + // Return to idle mode. + // + g_eOTGModeState = USB_OTG_MODE_WAIT; + + return; + } + + // + // Handle receiving a reset. + // + if((ulStatus & USB_INTCTRL_RESET)&& + (g_eOTGModeState != USB_OTG_MODE_B_DEVICE)) + { + // + // Getting a reset interrupt when not already a b side device indicates + // that a host is resetting the device and the controller should + // move to device mode. + // + g_eOTGModeState = USB_OTG_MODE_B_DEVICE; + + // + // Save the new mode. + // + USBOTGSetMode(USB_MODE_DEVICE); + } + + // + // If there is a connect interrupt while the library is waiting for + // one then move to full host mode state. + // + if(ulStatus & USB_INTCTRL_CONNECT) + { + // + // Move to A side host state. + // + g_eOTGModeState = USB_OTG_MODE_A_HOST; + + // + // Inform the application that controller is in host mode. + // + USBOTGSetMode(USB_MODE_HOST); + } + + // + // Call the correct device or host interrupt handler based on the current + // mode of operation. + // + switch(g_eOTGModeState) + { + case USB_OTG_MODE_A_HOST: + { + // + // Call the host interrupt handler if there is anything still to + // process. + // + USBHostIntHandlerInternal(0, ulStatus); + + break; + } + + // + // Operating in pure device mode. + // + case USB_OTG_MODE_B_DEVICE: + { + // + // Call the device interrupt handler. + // + USBDeviceIntHandlerInternal(0, ulStatus); + + break; + } + default: + { + break; + } + } +} + +//***************************************************************************** +// +// This function is called by the USB host stack code to indicated that it +// has compeleted handing the device disconnection. +// +// \param ulIndex specifies the USB controller that has completed disconnect. +// +// This internal library function is used when the hsot controller has completed +// any deferred handling when it has detected a device has been disconnected. +// The functions main purpose is to return the OTG controller to a state that +// allows for resuming normal OTG cable detection and negotiation. +// +// \note This function should not be called outside the library. +// +//***************************************************************************** +void +OTGDeviceDisconnect(unsigned long ulIndex) +{ + // + // This function is only valid when called in host mode. + // + if(g_eOTGModeState == USB_OTG_MODE_A_HOST) + { + // + // No longer a host so switch to unconfigured mode. + // + USBOTGSetMode(USB_MODE_NONE); + + g_eOTGModeState = USB_OTG_MODE_WAIT; + } +} + +//***************************************************************************** +// +//! This function is the main routine for the OTG Controller Driver. +//! +//! \param ulMsTicks is the number of milliseconds that have passed since the +//! last time this function was called. +//! +//! This function is the main routine for the USB controller when using the +//! library in OTG mode. This routine must be called periodically by the main +//! application outside of a callback context. The \e ulMsTicks value is used +//! for basic timing needed by the USB library when operating in OTG mode. This +//! allows for a simple cooperative system to access the the OTG controller +//! driver interface without the need for an RTOS. All time critical operations +//! are handled in interrupt context but all longer operations are run from +//! the this function to allow them to block and wait for completion without +//! holding off other interrupts. +//! +//! \return None. +// +//***************************************************************************** +void +USBOTGMain(unsigned long ulMsTicks) +{ + tEventInfo sEvent; + + if(ulMsTicks > g_ulWaitTicks) + { + g_ulWaitTicks = 0; + } + else + { + g_ulWaitTicks -= ulMsTicks; + } + + switch(g_eOTGModeState) + { + case USB_OTG_MODE_IDLE: + { + g_eOTGModeState = USB_OTG_MODE_WAITID; + + // + // Initiate a session request and check the ID pin. + // + USBOTGSessionRequest(USB0_BASE, true); + break; + } + case USB_OTG_MODE_WAIT: + case USB_OTG_MODE_WAITID: + { + // + // If reached the timeout and polling is enabled then look again. + // + if((g_ulWaitTicks == 0) && (g_ulPollRate != 0)) + { + // + // Remove the session request. + // + USBOTGSessionRequest(USB0_BASE, false); + + // + // Return to idle mode. + // + USBOTGSetMode(USB_MODE_NONE); + + // + // Check if the controller is automatically applying power or + // not. + // + if(USBHCDPowerAutomatic(0) == 0) + { + // + // Call the registered event driver to allow it to disable + // power. + // + sEvent.ulEvent = USB_EVENT_POWER_DISABLE; + sEvent.ulInstance = 0; + InternalUSBHCDSendEvent(0, &sEvent, USBHCD_EVFLAG_PWRDIS); + } + + // + // Go back to the idle state. + // + g_eOTGModeState = USB_OTG_MODE_IDLE; + } + break; + } + case USB_OTG_MODE_A_HOST: + { + // + // Call the host main routine when acting as a host. + // + USBHCDMain(); + break; + } + case USB_OTG_MODE_B_WAITCON: + case USB_OTG_MODE_B_DEVICE: + default: + { + break; + } + } +} + +//***************************************************************************** +// +// Close the Doxygen group. +//! @} +// +//***************************************************************************** -- cgit v1.3.1