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usb_device.c
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/*******************************************************************************
USB Device Layer
Company:
Microchip Technology Inc.
File Name:
usb_device.c
Summary:
Provides basic USB device functionality, including enumeration and USB
chapter 9 required behavior.
Description:
Provides basic USB device functionality, including enumeration and USB
chapter 9 required behavior.
*******************************************************************************/
// DOM-IGNORE-BEGIN
/*******************************************************************************
Copyright (c) 2013 released Microchip Technology Inc. All rights reserved.
Microchip licenses to you the right to use, modify, copy and distribute
Software only when embedded on a Microchip microcontroller or digital signal
controller that is integrated into your product or third party product
(pursuant to the sublicense terms in the accompanying license agreement).
You should refer to the license agreement accompanying this Software for
additional information regarding your rights and obligations.
SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF
MERCHANTABILITY, TITLE, NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL MICROCHIP OR ITS LICENSORS BE LIABLE OR OBLIGATED UNDER
CONTRACT, NEGLIGENCE, STRICT LIABILITY, CONTRIBUTION, BREACH OF WARRANTY, OR
OTHER LEGAL EQUITABLE THEORY ANY DIRECT OR INDIRECT DAMAGES OR EXPENSES
INCLUDING BUT NOT LIMITED TO ANY INCIDENTAL, SPECIAL, INDIRECT, PUNITIVE OR
CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF PROCUREMENT OF
SUBSTITUTE GOODS, TECHNOLOGY, SERVICES, OR ANY CLAIMS BY THIRD PARTIES
(INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF), OR OTHER SIMILAR COSTS.
*******************************************************************************/
// DOM-IGNORE-END
// *****************************************************************************
// *****************************************************************************
// Section: Included Files
// *****************************************************************************
// *****************************************************************************
#include <stdint.h>
#include <stddef.h>
#include "usb.h"
#include "usb_ch9.h"
#include "usb_device.h"
#include "usb_device_local.h"
#if defined(USB_USE_MSD)
#include "usb_device_msd.h"
#endif
// *****************************************************************************
// *****************************************************************************
// Section: File Scope or Global Constants
// *****************************************************************************
// *****************************************************************************
#if !defined(USE_USB_BUS_SENSE_IO)
//Assume the +5V VBUS is always present (like it would be in a bus powered
//only application), unless USE_USB_BUS_SENSE_IO and USB_BUS_SENSE have
//been properly defined elsewhere in the project.
#undef USB_BUS_SENSE
#define USB_BUS_SENSE 1
#endif
#if defined(USB_DEVICE_DISABLE_DTS_CHECKING)
#define _DTS_CHECKING_ENABLED 0
#else
#define _DTS_CHECKING_ENABLED _DTSEN
#endif
#if !defined(self_power)
//Assume the application is always bus powered, unless self_power has been
//defined elsewhere in the project
#define self_power 0 //0 = bus powered
#endif
#if !defined(USB_MAX_NUM_CONFIG_DSC)
//Assume the application only implements one configuration descriptor,
//unless otherwise specified elsewhere in the project
#define USB_MAX_NUM_CONFIG_DSC 1
#endif
#if defined(__XC8)
//Suppress expected/harmless compiler warning message about unused RAM variables.
//Certain variables are not used if you don't use all of the USB stack APIs.
//These variables should not be removed (since they are still used/needed in
//some applications).
#pragma warning disable 1090
#endif
// *****************************************************************************
// *****************************************************************************
// Section: File Scope Data Types
// *****************************************************************************
// *****************************************************************************
typedef union
{
uint8_t Val;
struct __PACKED
{
unsigned b0:1;
unsigned b1:1;
unsigned b2:1;
unsigned b3:1;
unsigned b4:1;
unsigned b5:1;
unsigned b6:1;
unsigned b7:1;
} bits;
} uint8_t_VAL, uint8_t_BITS;
// *****************************************************************************
// *****************************************************************************
// Section: Variables
// *****************************************************************************
// *****************************************************************************
USB_VOLATILE USB_DEVICE_STATE USBDeviceState;
USB_VOLATILE uint8_t USBActiveConfiguration;
USB_VOLATILE uint8_t USBAlternateInterface[USB_MAX_NUM_INT];
volatile BDT_ENTRY *pBDTEntryEP0OutCurrent;
volatile BDT_ENTRY *pBDTEntryEP0OutNext;
volatile BDT_ENTRY *pBDTEntryOut[USB_MAX_EP_NUMBER+1];
volatile BDT_ENTRY *pBDTEntryIn[USB_MAX_EP_NUMBER+1];
USB_VOLATILE uint8_t shortPacketStatus;
USB_VOLATILE uint8_t controlTransferState;
USB_VOLATILE IN_PIPE inPipes[1];
USB_VOLATILE OUT_PIPE outPipes[1];
USB_VOLATILE uint8_t *pDst;
USB_VOLATILE bool RemoteWakeup;
USB_VOLATILE bool USBBusIsSuspended;
USB_VOLATILE USTAT_FIELDS USTATcopy;
USB_VOLATILE uint8_t endpoint_number;
USB_VOLATILE bool BothEP0OutUOWNsSet;
USB_VOLATILE EP_STATUS ep_data_in[USB_MAX_EP_NUMBER+1];
USB_VOLATILE EP_STATUS ep_data_out[USB_MAX_EP_NUMBER+1];
USB_VOLATILE uint8_t USBStatusStageTimeoutCounter;
volatile bool USBDeferStatusStagePacket;
volatile bool USBStatusStageEnabledFlag1;
volatile bool USBStatusStageEnabledFlag2;
volatile bool USBDeferINDataStagePackets;
volatile bool USBDeferOUTDataStagePackets;
/** USB FIXED LOCATION VARIABLES ***********************************/
#if defined(COMPILER_MPLAB_C18)
#pragma udata USB_BDT=USB_BDT_ADDRESS
#endif
volatile BDT_ENTRY BDT[BDT_NUM_ENTRIES] BDT_BASE_ADDR_TAG;
/********************************************************************
* EP0 Buffer Space
*******************************************************************/
volatile CTRL_TRF_SETUP SetupPkt CTRL_TRF_SETUP_ADDR_TAG;
volatile uint8_t CtrlTrfData[USB_EP0_BUFF_SIZE] CTRL_TRF_DATA_ADDR_TAG;
/********************************************************************
* non-EP0 Buffer Space
*******************************************************************/
#if defined(USB_USE_MSD)
//Check if the MSD application specific USB endpoint buffer placement address
//macros have already been defined or not (ex: in a processor specific header)
//The msd_cbw and msd_csw buffers must be USB module accessible (and therefore
//must be at a certain address range on certain microcontrollers).
#if !defined(MSD_CBW_ADDR_TAG)
//Not previously defined. Assume in this case all microcontroller RAM is
//USB module accessible, and therefore, no specific address tag value is needed.
#define MSD_CBW_ADDR_TAG
#define MSD_CSW_ADDR_TAG
#endif
volatile USB_MSD_CBW msd_cbw MSD_CBW_ADDR_TAG; //Must be located in USB module accessible RAM
volatile USB_MSD_CSW msd_csw MSD_CSW_ADDR_TAG; //Must be located in USB module accessible RAM
#if defined(__18CXX) || defined(__XC8)
volatile char msd_buffer[512] @ MSD_BUFFER_ADDRESS;
#else
volatile char msd_buffer[512];
#endif
#endif
//Depricated in v2.2 - will be removed in a future revision
#if !defined(USB_USER_DEVICE_DESCRIPTOR)
//Device descriptor
extern const USB_DEVICE_DESCRIPTOR device_dsc;
#else
USB_USER_DEVICE_DESCRIPTOR_INCLUDE;
#endif
#if !defined(USB_USER_CONFIG_DESCRIPTOR)
//Array of configuration descriptors
extern const uint8_t *const USB_CD_Ptr[];
#else
USB_USER_CONFIG_DESCRIPTOR_INCLUDE;
#endif
extern const uint8_t *const USB_SD_Ptr[];
// *****************************************************************************
// *****************************************************************************
// Section: Private and External Prototypes
// *****************************************************************************
// *****************************************************************************
extern bool USER_USB_CALLBACK_EVENT_HANDLER(USB_EVENT event, void *pdata, uint16_t size);
static void USBCtrlEPService(void);
static void USBCtrlTrfSetupHandler(void);
static void USBCtrlTrfInHandler(void);
static void USBCheckStdRequest(void);
static void USBStdGetDscHandler(void);
static void USBCtrlEPServiceComplete(void);
static void USBCtrlTrfTxService(void);
static void USBCtrlTrfRxService(void);
static void USBStdSetCfgHandler(void);
static void USBStdGetStatusHandler(void);
static void USBStdFeatureReqHandler(void);
static void USBCtrlTrfOutHandler(void);
static void USBConfigureEndpoint(uint8_t EPNum, uint8_t direction);
static void USBWakeFromSuspend(void);
static void USBSuspend(void);
static void USBStallHandler(void);
// *****************************************************************************
// *****************************************************************************
// Section: Macros or Functions
// *****************************************************************************
// *****************************************************************************
/****************************************************************************
Function:
void USBAdvancePingPongBuffer(BDT_ENTRY** buffer)
Description:
This function will advance the passed pointer to the next buffer based on
the ping pong option setting. This function should be used for EP1-EP15
only. This function is not valid for EP0.
Precondition:
None
Parameters:
BDT_ENTRY** - pointer to the BDT_ENTRY pointer that you want to be advanced
to the next buffer state
Return Values:
None
Remarks:
None
***************************************************************************/
#define USBAdvancePingPongBuffer(buffer) {((uint8_t_VAL*)buffer)->Val ^= USB_NEXT_PING_PONG;}
#define USBHALPingPongSetToOdd(buffer) {((uint8_t_VAL*)buffer)->Val |= USB_NEXT_PING_PONG;}
#define USBHALPingPongSetToEven(buffer) {((uint8_t_VAL*)buffer)->Val &= ~USB_NEXT_PING_PONG;}
/**************************************************************************
Function:
void USBDeviceInit(void)
Description:
This function initializes the device stack it in the default state. The
USB module will be completely reset including all of the internal
variables, registers, and interrupt flags.
Precondition:
This function must be called before any of the other USB Device
functions can be called, including USBDeviceTasks().
Parameters:
None
Return Values:
None
Remarks:
None
***************************************************************************/
void USBDeviceInit(void)
{
uint8_t i;
USBDisableInterrupts();
// Clear all USB error flags
USBClearInterruptRegister(U1EIR);
// Clears all USB interrupts
USBClearInterruptRegister(U1IR);
//Clear all of the endpoint control registers
U1EP0 = 0;
DisableNonZeroEndpoints(USB_MAX_EP_NUMBER);
SetConfigurationOptions();
//power up the module (if not already powered)
USBPowerModule();
//set the address of the BDT (if applicable)
USBSetBDTAddress(BDT);
//Clear all of the BDT entries
for(i=0;i<(sizeof(BDT)/sizeof(BDT_ENTRY));i++)
{
BDT[i].Val = 0x00;
}
// Assert reset request to all of the Ping Pong buffer pointers
USBPingPongBufferReset = 1;
// Reset to default address
U1ADDR = 0x00;
// Make sure packet processing is enabled
USBPacketDisable = 0;
//Stop trying to reset ping pong buffer pointers
USBPingPongBufferReset = 0;
// Flush any pending transactions
while(USBTransactionCompleteIF == 1)
{
USBClearInterruptFlag(USBTransactionCompleteIFReg,USBTransactionCompleteIFBitNum);
//Initialize USB stack software state variables
inPipes[0].info.Val = 0;
outPipes[0].info.Val = 0;
outPipes[0].wCount.Val = 0;
}
//Set flags to true, so the USBCtrlEPAllowStatusStage() function knows not to
//try and arm a status stage, even before the first control transfer starts.
USBStatusStageEnabledFlag1 = true;
USBStatusStageEnabledFlag2 = true;
//Initialize other flags
USBDeferINDataStagePackets = false;
USBDeferOUTDataStagePackets = false;
USBBusIsSuspended = false;
//Initialize all pBDTEntryIn[] and pBDTEntryOut[]
//pointers to NULL, so they don't get used inadvertently.
for(i = 0; i < (uint8_t)(USB_MAX_EP_NUMBER+1u); i++)
{
pBDTEntryIn[i] = 0u;
pBDTEntryOut[i] = 0u;
ep_data_in[i].Val = 0u;
ep_data_out[i].Val = 0u;
}
//Get ready for the first packet
pBDTEntryIn[0] = (volatile BDT_ENTRY*)&BDT[EP0_IN_EVEN];
// Initialize EP0 as a Ctrl EP
U1EP0 = EP_CTRL|USB_HANDSHAKE_ENABLED;
//Prepare for the first SETUP on EP0 OUT
BDT[EP0_OUT_EVEN].ADR = ConvertToPhysicalAddress(&SetupPkt);
BDT[EP0_OUT_EVEN].CNT = USB_EP0_BUFF_SIZE;
BDT[EP0_OUT_EVEN].STAT.Val = _DAT0|_BSTALL;
BDT[EP0_OUT_EVEN].STAT.Val |= _USIE;
// Clear active configuration
USBActiveConfiguration = 0;
//Indicate that we are now in the detached state
USBDeviceState = DETACHED_STATE;
}
/**************************************************************************
Function:
void USBDeviceTasks(void)
Summary:
This function is the main state machine/transaction handler of the USB
device side stack. When the USB stack is operated in "USB_POLLING" mode
(usb_config.h user option) the USBDeviceTasks() function should be called
periodically to receive and transmit packets through the stack. This
function also takes care of control transfers associated with the USB
enumeration process, and detecting various USB events (such as suspend).
This function should be called at least once every 1.8ms during the USB
enumeration process. After the enumeration process is complete (which can
be determined when USBGetDeviceState() returns CONFIGURED_STATE), the
USBDeviceTasks() handler may be called the faster of: either once
every 9.8ms, or as often as needed to make sure that the hardware USTAT
FIFO never gets full. A good rule of thumb is to call USBDeviceTasks() at
a minimum rate of either the frequency that USBTransferOnePacket() gets
called, or, once/1.8ms, whichever is faster. See the inline code comments
near the top of usb_device.c for more details about minimum timing
requirements when calling USBDeviceTasks().
When the USB stack is operated in "USB_INTERRUPT" mode, it is not necessary
to call USBDeviceTasks() from the main loop context. In the USB_INTERRUPT
mode, the USBDeviceTasks() handler only needs to execute when a USB
interrupt occurs, and therefore only needs to be called from the interrupt
context.
Description:
This function is the main state machine/transaction handler of the USB
device side stack. When the USB stack is operated in "USB_POLLING" mode
(usb_config.h user option) the USBDeviceTasks() function should be called
periodically to receive and transmit packets through the stack. This
function also takes care of control transfers associated with the USB
enumeration process, and detecting various USB events (such as suspend).
This function should be called at least once every 1.8ms during the USB
enumeration process. After the enumeration process is complete (which can
be determined when USBGetDeviceState() returns CONFIGURED_STATE), the
USBDeviceTasks() handler may be called the faster of: either once
every 9.8ms, or as often as needed to make sure that the hardware USTAT
FIFO never gets full. A good rule of thumb is to call USBDeviceTasks() at
a minimum rate of either the frequency that USBTransferOnePacket() gets
called, or, once/1.8ms, whichever is faster. See the inline code comments
near the top of usb_device.c for more details about minimum timing
requirements when calling USBDeviceTasks().
When the USB stack is operated in "USB_INTERRUPT" mode, it is not necessary
to call USBDeviceTasks() from the main loop context. In the USB_INTERRUPT
mode, the USBDeviceTasks() handler only needs to execute when a USB
interrupt occurs, and therefore only needs to be called from the interrupt
context.
Typical usage:
<code>
void main(void)
{
USBDeviceInit();
while(1)
{
USBDeviceTasks(); //Takes care of enumeration and other USB events
if((USBGetDeviceState() \< CONFIGURED_STATE) ||
(USBIsDeviceSuspended() == true))
{
//Either the device is not configured or we are suspended,
// so we don't want to execute any USB related application code
continue; //go back to the top of the while loop
}
else
{
//Otherwise we are free to run USB and non-USB related user
//application code.
UserApplication();
}
}
}
</code>
Precondition:
Make sure the USBDeviceInit() function has been called prior to calling
USBDeviceTasks() for the first time.
Remarks:
USBDeviceTasks() does not need to be called while in the USB suspend mode,
if the user application firmware in the USBCBSuspend() callback function
enables the ACTVIF USB interrupt source and put the microcontroller into
sleep mode. If the application firmware decides not to sleep the
microcontroller core during USB suspend (ex: continues running at full
frequency, or clock switches to a lower frequency), then the USBDeviceTasks()
function must still be called periodically, at a rate frequent enough to
ensure the 10ms resume recovery interval USB specification is met. Assuming
a worst case primary oscillator and PLL start up time of less than 5ms, then
USBDeviceTasks() should be called once every 5ms in this scenario.
When the USB cable is detached, or the USB host is not actively powering
the VBUS line to +5V nominal, the application firmware does not always have
to call USBDeviceTasks() frequently, as no USB activity will be taking
place. However, if USBDeviceTasks() is not called regularly, some
alternative means of promptly detecting when VBUS is powered (indicating
host attachment), or not powered (host powered down or USB cable unplugged)
is still needed. For self or dual self/bus powered USB applications, see
the USBDeviceAttach() and USBDeviceDetach() API documentation for additional
considerations.
***************************************************************************/
void USBDeviceTasks(void)
{
uint8_t i;
#ifdef USB_SUPPORT_OTG
//SRP Time Out Check
if (USBOTGSRPIsReady())
{
if (USBT1MSECIF && USBT1MSECIE)
{
if (USBOTGGetSRPTimeOutFlag())
{
if (USBOTGIsSRPTimeOutExpired())
{
USB_OTGEventHandler(0,OTG_EVENT_SRP_FAILED,0,0);
}
}
//Clear Interrupt Flag
USBClearInterruptFlag(USBT1MSECIFReg,USBT1MSECIFBitNum);
}
}
#endif
#if defined(USB_POLLING)
//If the interrupt option is selected then the customer is required
// to notify the stack when the device is attached or removed from the
// bus by calling the USBDeviceAttach() and USBDeviceDetach() functions.
if (USB_BUS_SENSE != 1)
{
// Disable module & detach from bus
U1CON = 0;
// Mask all USB interrupts
U1IE = 0;
//Move to the detached state
USBDeviceState = DETACHED_STATE;
#ifdef USB_SUPPORT_OTG
//Disable D+ Pullup
U1OTGCONbits.DPPULUP = 0;
//Disable HNP
USBOTGDisableHnp();
//Deactivate HNP
USBOTGDeactivateHnp();
//If ID Pin Changed State
if (USBIDIF && USBIDIE)
{
//Re-detect & Initialize
USBOTGInitialize();
//Clear ID Interrupt Flag
USBClearInterruptFlag(USBIDIFReg,USBIDIFBitNum);
}
#endif
#if defined __C30__ || defined __XC16__
//USBClearInterruptFlag(U1OTGIR, 3);
#endif
//return so that we don't go through the rest of
//the state machine
USBClearUSBInterrupt();
return;
}
#ifdef USB_SUPPORT_OTG
//If Session Is Started Then
else
{
//If SRP Is Ready
if (USBOTGSRPIsReady())
{
//Clear SRPReady
USBOTGClearSRPReady();
//Clear SRP Timeout Flag
USBOTGClearSRPTimeOutFlag();
//Indicate Session Started
UART2PrintString( "\r\n***** USB OTG B Event - Session Started *****\r\n" );
}
}
#endif //#ifdef USB_SUPPORT_OTG
//if we are in the detached state
if(USBDeviceState == DETACHED_STATE)
{
//Initialize register to known value
U1CON = 0;
// Mask all USB interrupts
U1IE = 0;
//Enable/set things like: pull ups, full/low-speed mode,
//set the ping pong mode, and set internal transceiver
SetConfigurationOptions();
// Enable module & attach to bus
while(!U1CONbits.USBEN){U1CONbits.USBEN = 1;}
//moved to the attached state
USBDeviceState = ATTACHED_STATE;
#ifdef USB_SUPPORT_OTG
U1OTGCON |= USB_OTG_DPLUS_ENABLE | USB_OTG_ENABLE;
#endif
}
#endif //#if defined(USB_POLLING)
if(USBDeviceState == ATTACHED_STATE)
{
/*
* After enabling the USB module, it takes some time for the
* voltage on the D+ or D- line to rise high enough to get out
* of the SE0 condition. The USB Reset interrupt should not be
* unmasked until the SE0 condition is cleared. This helps
* prevent the firmware from misinterpreting this unique event
* as a USB bus reset from the USB host.
*/
if(!USBSE0Event)
{
USBClearInterruptRegister(U1IR);// Clear all USB interrupts
#if defined(USB_POLLING)
U1IE=0; // Mask all USB interrupts
#endif
USBResetIE = 1; // Unmask RESET interrupt
USBIdleIE = 1; // Unmask IDLE interrupt
USBDeviceState = POWERED_STATE;
}
}
#ifdef USB_SUPPORT_OTG
//If ID Pin Changed State
if (USBIDIF && USBIDIE)
{
//Re-detect & Initialize
USBOTGInitialize();
USBClearInterruptFlag(USBIDIFReg,USBIDIFBitNum);
}
#endif
/*
* Task A: Service USB Activity Interrupt
*/
if(USBActivityIF && USBActivityIE)
{
USBClearInterruptFlag(USBActivityIFReg,USBActivityIFBitNum);
#if defined(USB_SUPPORT_OTG)
U1OTGIR = 0x10;
#else
USBWakeFromSuspend();
#endif
}
/*
* Pointless to continue servicing if the device is in suspend mode.
*/
if(USBSuspendControl==1)
{
USBClearUSBInterrupt();
return;
}
/*
* Task B: Service USB Bus Reset Interrupt.
* When bus reset is received during suspend, ACTVIF will be set first,
* once the UCONbits.SUSPND is clear, then the URSTIF bit will be asserted.
* This is why URSTIF is checked after ACTVIF.
*
* The USB reset flag is masked when the USB state is in
* DETACHED_STATE or ATTACHED_STATE, and therefore cannot
* cause a USB reset event during these two states.
*/
if(USBResetIF && USBResetIE)
{
USB_RESET_HANDLER(EVENT_RESET,0,1);
USBDeviceInit();
//Re-enable the interrupts since the USBDeviceInit() function will
// disable them. This will do nothing in a polling setup
USBUnmaskInterrupts();
USBDeviceState = DEFAULT_STATE;
#ifdef USB_SUPPORT_OTG
//Disable HNP
USBOTGDisableHnp();
//Deactivate HNP
USBOTGDeactivateHnp();
#endif
USBClearInterruptFlag(USBResetIFReg,USBResetIFBitNum);
}
/*
* Task C: Service other USB interrupts
*/
if(USBIdleIF && USBIdleIE)
{
#ifdef USB_SUPPORT_OTG
//If Suspended, Try to switch to Host
USBOTGSelectRole(ROLE_HOST);
#else
USBSuspend();
#endif
USBClearInterruptFlag(USBIdleIFReg,USBIdleIFBitNum);
}
if(USBSOFIF)
{
if(USBSOFIE)
{
USB_SOF_HANDLER(EVENT_SOF,0,1);
}
USBClearInterruptFlag(USBSOFIFReg,USBSOFIFBitNum);
#if defined(USB_ENABLE_STATUS_STAGE_TIMEOUTS)
//Supporting this feature requires a 1ms timebase for keeping track of the timeout interval.
#if(USB_SPEED_OPTION == USB_LOW_SPEED)
#warning "Double click this message. See inline code comments."
//The "USB_ENABLE_STATUS_STAGE_TIMEOUTS" feature is optional and is
//not strictly needed in all applications (ex: those that never call
//USBDeferStatusStage() and don't use host to device (OUT) control
//transfers with data stage).
//However, if this feature is enabled and used, it requires a timer
//(preferrably 1ms) to decrement the USBStatusStageTimeoutCounter.
//In USB Full Speed applications, the host sends Start-of-Frame (SOF)
//packets at a 1ms rate, which generates SOFIF interrupts.
//These interrupts can be used to decrement USBStatusStageTimeoutCounter as shown
//below. However, the host does not send SOF packets to Low Speed devices.
//Therefore, some other method (ex: using a general purpose microcontroller
//timer, such as Timer0) needs to be implemented to call and execute the below code
//at a once/1ms rate, in a low speed USB application.
//Note: Pre-condition to executing the below code: USBDeviceInit() should have
//been called at least once (since the last microcontroller reset/power up),
//prior to executing the below code.
#endif
//Decrement our status stage counter.
if(USBStatusStageTimeoutCounter != 0u)
{
USBStatusStageTimeoutCounter--;
}
//Check if too much time has elapsed since progress was made in
//processing the control transfer, without arming the status stage.
//If so, auto-arm the status stage to ensure that the control
//transfer can [eventually] complete, within the timing limits
//dictated by section 9.2.6 of the official USB 2.0 specifications.
if(USBStatusStageTimeoutCounter == 0)
{
USBCtrlEPAllowStatusStage(); //Does nothing if the status stage was already armed.
}
#endif
}
if(USBStallIF && USBStallIE)
{
USBStallHandler();
}
if(USBErrorIF && USBErrorIE)
{
USB_ERROR_HANDLER(EVENT_BUS_ERROR,0,1);
USBClearInterruptRegister(U1EIR); // This clears UERRIF
//On PIC18, clearing the source of the error will automatically clear
// the interrupt flag. On other devices the interrupt flag must be
// manually cleared.
#if defined(__C32__) || defined(__C30__) || defined __XC16__
USBClearInterruptFlag( USBErrorIFReg, USBErrorIFBitNum );
#endif
}
/*
* Pointless to continue servicing if the host has not sent a bus reset.
* Once bus reset is received, the device transitions into the DEFAULT
* state and is ready for communication.
*/
if(USBDeviceState < DEFAULT_STATE)
{
USBClearUSBInterrupt();
return;
}
/*
* Task D: Servicing USB Transaction Complete Interrupt
*/
if(USBTransactionCompleteIE)
{
for(i = 0; i < 4u; i++) //Drain or deplete the USAT FIFO entries. If the USB FIFO ever gets full, USB bandwidth
{ //utilization can be compromised, and the device won't be able to receive SETUP packets.
if(USBTransactionCompleteIF)
{
//Save and extract USTAT register info. Will use this info later.
USTATcopy.Val = U1STAT;
endpoint_number = USBHALGetLastEndpoint(USTATcopy);
USBClearInterruptFlag(USBTransactionCompleteIFReg,USBTransactionCompleteIFBitNum);
//Keep track of the hardware ping pong state for endpoints other
//than EP0, if ping pong buffering is enabled.
#if (USB_PING_PONG_MODE == USB_PING_PONG__ALL_BUT_EP0) || (USB_PING_PONG_MODE == USB_PING_PONG__FULL_PING_PONG)
if(USBHALGetLastDirection(USTATcopy) == OUT_FROM_HOST)
{
ep_data_out[endpoint_number].bits.ping_pong_state ^= 1;
}
else
{
ep_data_in[endpoint_number].bits.ping_pong_state ^= 1;
}
#endif
//USBCtrlEPService only services transactions over EP0.
//It ignores all other EP transactions.
if(endpoint_number == 0)
{
USBCtrlEPService();
}
else
{
USB_TRANSFER_COMPLETE_HANDLER(EVENT_TRANSFER, (uint8_t*)&USTATcopy.Val, 0);
}
}//end if(USBTransactionCompleteIF)
else
{
break; //USTAT FIFO must be empty.
}
}//end for()
}//end if(USBTransactionCompleteIE)
USBClearUSBInterrupt();
}//end of USBDeviceTasks()
/*******************************************************************************
Function:
void USBEnableEndpoint(uint8_t ep, uint8_t options)
Summary:
This function will enable the specified endpoint with the specified
options
Description:
This function will enable the specified endpoint with the specified
options.
Typical Usage:
<code>
void USBCBInitEP(void)
{
USBEnableEndpoint(MSD_DATA_IN_EP,USB_IN_ENABLED|USB_OUT_ENABLED|USB_HANDSHAKE_ENABLED|USB_DISALLOW_SETUP);
USBMSDInit();
}
</code>
In the above example endpoint number MSD_DATA_IN_EP is being configured
for both IN and OUT traffic with handshaking enabled. Also since
MSD_DATA_IN_EP is not endpoint 0 (MSD does not allow this), then we can
explicitly disable SETUP packets on this endpoint.
Conditions:
None
Input:
uint8_t ep - the endpoint to be configured
uint8_t options - optional settings for the endpoint. The options should
be ORed together to form a single options string. The
available optional settings for the endpoint. The
options should be ORed together to form a single options
string. The available options are the following\:
* USB_HANDSHAKE_ENABLED enables USB handshaking (ACK,
NAK)
* USB_HANDSHAKE_DISABLED disables USB handshaking (ACK,
NAK)
* USB_OUT_ENABLED enables the out direction
* USB_OUT_DISABLED disables the out direction
* USB_IN_ENABLED enables the in direction
* USB_IN_DISABLED disables the in direction
* USB_ALLOW_SETUP enables control transfers
* USB_DISALLOW_SETUP disables control transfers
* USB_STALL_ENDPOINT STALLs this endpoint
Return:
None
Remarks:
None
*****************************************************************************/
void USBEnableEndpoint(uint8_t ep, uint8_t options)
{
unsigned char* p;
//Use USBConfigureEndpoint() to set up the pBDTEntryIn/Out[ep] pointer and
//starting DTS state in the BDT entry.
if(options & USB_OUT_ENABLED)
{
USBConfigureEndpoint(ep, OUT_FROM_HOST);
}
if(options & USB_IN_ENABLED)
{
USBConfigureEndpoint(ep, IN_TO_HOST);
}
//Update the relevant UEPx register to actually enable the endpoint with
//the specified options (ex: handshaking enabled, control transfers allowed,
//etc.)
#if defined(__C32__)
p = (unsigned char*)(&U1EP0+(4*ep));
#else
p = (unsigned char*)(&U1EP0+ep);
#endif
*p = options;
}
/*************************************************************************
Function:
USB_HANDLE USBTransferOnePacket(uint8_t ep, uint8_t dir, uint8_t* data, uint8_t len)
Summary:
Transfers a single packet (one transaction) of data on the USB bus.
Description:
The USBTransferOnePacket() function prepares a USB endpoint
so that it may send data to the host (an IN transaction), or
receive data from the host (an OUT transaction). The
USBTransferOnePacket() function can be used both to receive and
send data to the host. This function is the primary API function
provided by the USB stack firmware for sending or receiving application
data over the USB port.
The USBTransferOnePacket() is intended for use with all application
endpoints. It is not used for sending or receiving applicaiton data
through endpoint 0 by using control transfers. Separate API
functions, such as USBEP0Receive(), USBEP0SendRAMPtr(), and
USBEP0SendROMPtr() are provided for this purpose.
The USBTransferOnePacket() writes to the Buffer Descriptor Table (BDT)
entry associated with an endpoint buffer, and sets the UOWN bit, which
prepares the USB hardware to allow the transaction to complete. The
application firmware can use the USBHandleBusy() macro to check the
status of the transaction, to see if the data has been successfully
transmitted yet.
Typical Usage
<code>
//make sure that the we are in the configured state
if(USBGetDeviceState() == CONFIGURED_STATE)
{
//make sure that the last transaction isn't busy by checking the handle
if(!USBHandleBusy(USBInHandle))
{
//Write the new data that we wish to send to the host to the INPacket[] array
INPacket[0] = USEFUL_APPLICATION_VALUE1;
INPacket[1] = USEFUL_APPLICATION_VALUE2;
//INPacket[2] = ... (fill in the rest of the packet data)
//Send the data contained in the INPacket[] array through endpoint "EP_NUM"
USBInHandle = USBTransferOnePacket(EP_NUM,IN_TO_HOST,(uint8_t*)&INPacket[0],sizeof(INPacket));
}
}
</code>
Conditions:
Before calling USBTransferOnePacket(), the following should be true.
1. The USB stack has already been initialized (USBDeviceInit() was called).
2. A transaction is not already pending on the specified endpoint. This
is done by checking the previous request using the USBHandleBusy()
macro (see the typical usage example).
3. The host has already sent a set configuration request and the
enumeration process is complete.
This can be checked by verifying that the USBGetDeviceState()
macro returns "CONFIGURED_STATE", prior to calling
USBTransferOnePacket().
Input:
uint8_t ep - The endpoint number that the data will be transmitted or
received on
uint8_t dir - The direction of the transfer
This value is either OUT_FROM_HOST or IN_TO_HOST
uint8_t* data - For IN transactions: pointer to the RAM buffer containing
the data to be sent to the host. For OUT transactions: pointer
to the RAM buffer that the received data should get written to.
uint8_t len - Length of the data needing to be sent (for IN transactions).
For OUT transactions, the len parameter should normally be set
to the endpoint size specified in the endpoint descriptor.
Return Values:
USB_HANDLE - handle to the transfer. The handle is a pointer to
the BDT entry associated with this transaction. The
status of the transaction (ex: if it is complete or still
pending) can be checked using the USBHandleBusy() macro
and supplying the USB_HANDLE provided by
USBTransferOnePacket().
Remarks:
If calling the USBTransferOnePacket() function from within the USBCBInitEP()
callback function, the set configuration is still being processed and the
USBDeviceState may not be == CONFIGURED_STATE yet. In this special case,
the USBTransferOnePacket() may still be called, but make sure that the
endpoint has been enabled and initialized by the USBEnableEndpoint()
function first.
*************************************************************************/
USB_HANDLE USBTransferOnePacket(uint8_t ep,uint8_t dir,uint8_t* data,uint8_t len)
{
volatile BDT_ENTRY* handle;
//If the direction is IN
if(dir != 0)
{
//point to the IN BDT of the specified endpoint
handle = pBDTEntryIn[ep];
}
else
{
//else point to the OUT BDT of the specified endpoint