TM4C129作为USB主机是调用哪个库函数收发数据？

已经知道了输入输出管道号，是通过调用

uint32_t USBHCDPipeRead(uint32_t ui32Pipe, uint8_t *pui8Data, uint32_t ui32Size)

uint32_t  USBHCDPipeWrite(uint32_t ui32Pipe, uint8_t *pui8Data, uint32_t ui32Size)

来收发数据的吗？

xyz549040622：

不外乎就是把数据放在usb的数据缓冲区中，然后开启中断自动就发送出去了。可以参考官方的usb转串口的代码看看

//*****************************************************************************
//
// usb_dev_serial.c - Main routines for the USB CDC serial example.
//
// Copyright (c) 2012-2014 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 2.1.0.12573 of the EK-TM4C123GXL Firmware Package.
//
//*****************************************************************************#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/hw_gpio.h"
#include "inc/hw_uart.h"
#include "inc/hw_sysctl.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/interrupt.h"
#include "driverlib/sysctl.h"
#include "driverlib/systick.h"
#include "driverlib/timer.h"
#include "driverlib/uart.h"
#include "driverlib/usb.h"
#include "driverlib/rom.h"
#include "usblib/usblib.h"
#include "usblib/usbcdc.h"
#include "usblib/usb-ids.h"
#include "usblib/device/usbdevice.h"
#include "usblib/device/usbdcdc.h"
#include "utils/ustdlib.h"
#include "usb_serial_structs.h"
#include "utils/uartstdio.h"//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>USB Serial Device (usb_dev_serial)</h1>
//!
//! This example application turns the evaluation kit into a virtual serial
//! port when connected to the USB host system.The application supports the
//! USB Communication Device Class, Abstract Control Model to redirect UART0
//! traffic to and from the USB host system.
//!
//! Assuming you installed TivaWare C Series in the default directory, a
//! driver information (INF) file for use with Windows XP, Windows Vista and
//! Windows7 can be found in C:/ti/TivaWare-for-C-Series/windows_drivers.For
//! Windows 2000, the required INF file is in
//! C:/ti/TivaWare-for-C-Series/windows_drivers/win2K.
//
//*****************************************************************************//*****************************************************************************
//
// Note:
//
// This example is intended to run on Tiva C Series evaluation kit hardware
// where the UARTs are wired solely for TX and RX, and do not have GPIOs
// connected to act as handshake signals.As a result, this example mimics
// the case where communication is always possible.It reports DSR, DCD
// and CTS as high to ensure that the USB host recognizes that data can be
// sent and merely ignores the host's requested DTR and RTS states."TODO"
// comments in the code indicate where code would be required to add support
// for real handshakes.
//
//*****************************************************************************//*****************************************************************************
//
// Configuration and tuning parameters.
//
//*****************************************************************************//*****************************************************************************
//
// The system tick rate expressed both as ticks per second and a millisecond
// period.
//
//*****************************************************************************
#define SYSTICKS_PER_SECOND 100
#define SYSTICK_PERIOD_MS (1000 / SYSTICKS_PER_SECOND)//*****************************************************************************
//
// Variables tracking transmit and receive counts.
//
//*****************************************************************************
volatile uint32_t g_ui32UARTTxCount = 0;
volatile uint32_t g_ui32UARTRxCount = 0;
#ifdef DEBUG
uint32_t g_ui32UARTRxErrors = 0;
#endif//*****************************************************************************
//
// The base address, peripheral ID and interrupt ID of the UART that is to
// be redirected.
//
//*****************************************************************************//*****************************************************************************
//
// Defines required to redirect UART0 via USB.
//
//*****************************************************************************
#define USB_UART_BASEUART0_BASE
#define USB_UART_PERIPHSYSCTL_PERIPH_UART0
#define USB_UART_INTINT_UART0//*****************************************************************************
//
// Default line coding settings for the redirected UART.
//
//*****************************************************************************
#define DEFAULT_BIT_RATE115200
#define DEFAULT_UART_CONFIG(UART_CONFIG_WLEN_8 | UART_CONFIG_PAR_NONE | \UART_CONFIG_STOP_ONE)//*****************************************************************************
//
// GPIO peripherals and pins muxed with the redirected UART.These will depend
// upon the IC in use and the UART selected in USB_UART_BASE.Be careful that
// these settings all agree with the hardware you are using.
//
//*****************************************************************************//*****************************************************************************
//
// Defines required to redirect UART0 via USB.
//
//*****************************************************************************
#define TX_GPIO_BASEGPIO_PORTA_BASE
#define TX_GPIO_PERIPHSYSCTL_PERIPH_GPIOA
#define TX_GPIO_PINGPIO_PIN_1#define RX_GPIO_BASEGPIO_PORTA_BASE
#define RX_GPIO_PERIPHSYSCTL_PERIPH_GPIOA
#define RX_GPIO_PINGPIO_PIN_0//*****************************************************************************
//
// Flag indicating whether or not we are currently sending a Break condition.
//
//*****************************************************************************
static bool g_bSendingBreak = false;//*****************************************************************************
//
// Global system tick counter
//
//*****************************************************************************
volatile uint32_t g_ui32SysTickCount = 0;//*****************************************************************************
//
// Flags used to pass commands from interrupt context to the main loop.
//
//*****************************************************************************
#define COMMAND_PACKET_RECEIVED 0x00000001
#define COMMAND_STATUS_UPDATE0x00000002volatile uint32_t g_ui32Flags = 0;
char *g_pcStatus;//*****************************************************************************
//
// Global flag indicating that a USB configuration has been set.
//
//*****************************************************************************
static volatile bool g_bUSBConfigured = false;//*****************************************************************************
//
// Internal function prototypes.
//
//*****************************************************************************
static void USBUARTPrimeTransmit(uint32_t ui32Base);
static void CheckForSerialStateChange(const tUSBDCDCDevice *psDevice,int32_t i32Errors);
static void SetControlLineState(uint16_t ui16State);
static bool SetLineCoding(tLineCoding *psLineCoding);
static void GetLineCoding(tLineCoding *psLineCoding);
static void SendBreak(bool bSend);//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{while(1){}
}
#endif//*****************************************************************************
//
// This function is called whenever serial data is received from the UART.
// It is passed the accumulated error flags from each character received in
// this interrupt and determines from them whether or not an interrupt
// notification to the host is required.
//
// If a notification is required and the control interrupt endpoint is idle,
// we send the notification immediately.If the endpoint is not idle, we
// accumulate the errors in a global variable which will be checked on
// completion of the previous notification and used to send a second one
// if necessary.
//
//*****************************************************************************
static void
CheckForSerialStateChange(const tUSBDCDCDevice *psDevice, int32_t i32Errors)
{uint16_t ui16SerialState;//// Clear our USB serial state.Since we are faking the handshakes, always// set the TXCARRIER (DSR) and RXCARRIER (DCD) bits.//ui16SerialState = USB_CDC_SERIAL_STATE_TXCARRIER |USB_CDC_SERIAL_STATE_RXCARRIER;//// Are any error bits set?//if(i32Errors){//// At least one error is being notified so translate from our hardware// error bits into the correct state markers for the USB notification.//if(i32Errors & UART_DR_OE){ui16SerialState |= USB_CDC_SERIAL_STATE_OVERRUN;}if(i32Errors & UART_DR_PE){ui16SerialState |= USB_CDC_SERIAL_STATE_PARITY;}if(i32Errors & UART_DR_FE){ui16SerialState |= USB_CDC_SERIAL_STATE_FRAMING;}if(i32Errors & UART_DR_BE){ui16SerialState |= USB_CDC_SERIAL_STATE_BREAK;}// Call the CDC driver to notify the state change.USBDCDCSerialStateChange((void *)psDevice, ui16SerialState);}
}//*****************************************************************************
//
// Read as many characters from the UART FIFO as we can and move them into
// the CDC transmit buffer.
//
// \return Returns UART error flags read during data reception.
//
//*****************************************************************************
static int32_t
ReadUARTData(void)
{int32_t i32Char, i32Errors;uint8_t ui8Char;uint32_t ui32Space;//// Clear our error indicator.//i32Errors = 0;//// How much space do we have in the buffer?//ui32Space = USBBufferSpaceAvailable((tUSBBuffer *)&g_sTxBuffer);//// Read data from the UART FIFO until there is none left or we run// out of space in our receive buffer.//while(ui32Space && ROM_UARTCharsAvail(USB_UART_BASE)){//// Read a character from the UART FIFO into the ring buffer if no// errors are reported.//i32Char = ROM_UARTCharGetNonBlocking(USB_UART_BASE);//// If the character did not contain any error notifications,// copy it to the output buffer.//if(!(i32Char & ~0xFF)){ui8Char = (uint8_t)(i32Char & 0xFF);USBBufferWrite((tUSBBuffer *)&g_sTxBuffer,(uint8_t *)&ui8Char, 1);//// Decrement the number of bytes we know the buffer can accept.//ui32Space--;}else{
#ifdef DEBUG//// Increment our receive error counter.//g_ui32UARTRxErrors++;
#endif//// Update our error accumulator.//i32Errors |= i32Char;}//// Update our count of bytes received via the UART.//g_ui32UARTRxCount++;}//// Pass back the accumulated error indicators.//return(i32Errors);
}//*****************************************************************************
//
// Take as many bytes from the transmit buffer as we have space for and move
// them into the USB UART's transmit FIFO.
//
//*****************************************************************************
static void
USBUARTPrimeTransmit(uint32_t ui32Base)
{uint32_t ui32Read;uint8_t ui8Char;//// If we are currently sending a break condition, don't receive any// more data. We will resume transmission once the break is turned off.//if(g_bSendingBreak){return;}//// If there is space in the UART FIFO, try to read some characters// from the receive buffer to fill it again.//while(ROM_UARTSpaceAvail(ui32Base)){//// Get a character from the buffer.//ui32Read = USBBufferRead((tUSBBuffer *)&g_sRxBuffer, &ui8Char, 1);//// Did we get a character?//if(ui32Read){//// Place the character in the UART transmit FIFO.//ROM_UARTCharPutNonBlocking(ui32Base, ui8Char);//// Update our count of bytes transmitted via the UART.//g_ui32UARTTxCount++;}else{//// We ran out of characters so exit the function.//return;}}
}//*****************************************************************************
//
// Interrupt handler for the system tick counter.
//
//*****************************************************************************
void
SysTickIntHandler(void)
{//// Update our system time.//g_ui32SysTickCount++;
}//*****************************************************************************
//
// Interrupt handler for the UART which we are redirecting via USB.
//
//*****************************************************************************
void
USBUARTIntHandler(void)
{uint32_t ui32Ints;int32_t i32Errors;//// Get and clear the current interrupt source(s)//ui32Ints = ROM_UARTIntStatus(USB_UART_BASE, true);ROM_UARTIntClear(USB_UART_BASE, ui32Ints);//// Are we being interrupted because the TX FIFO has space available?//if(ui32Ints & UART_INT_TX){//// Move as many bytes as we can into the transmit FIFO.//USBUARTPrimeTransmit(USB_UART_BASE);//// If the output buffer is empty, turn off the transmit interrupt.//if(!USBBufferDataAvailable(&g_sRxBuffer)){ROM_UARTIntDisable(USB_UART_BASE, UART_INT_TX);}}//// Handle receive interrupts.//if(ui32Ints & (UART_INT_RX | UART_INT_RT)){//// Read the UART's characters into the buffer.//i32Errors = ReadUARTData();//// Check to see if we need to notify the host of any errors we just// detected.//CheckForSerialStateChange(&g_sCDCDevice, i32Errors);}
}//*****************************************************************************
//
// Set the state of the RS232 RTS and DTR signals.
//
//*****************************************************************************
static void
SetControlLineState(uint16_t ui16State)
{//// TODO: If configured with GPIOs controlling the handshake lines,// set them appropriately depending upon the flags passed in the wValue// field of the request structure passed.//
}//*****************************************************************************
//
// Set the communication parameters to use on the UART.
//
//*****************************************************************************
static bool
SetLineCoding(tLineCoding *psLineCoding)
{uint32_t ui32Config;bool bRetcode;//// Assume everything is OK until we detect any problem.//bRetcode = true;//// Word length.For invalid values, the default is to set 8 bits per// character and return an error.//switch(psLineCoding->ui8Databits){case 5:{ui32Config = UART_CONFIG_WLEN_5;break;}case 6:{ui32Config = UART_CONFIG_WLEN_6;break;}case 7:{ui32Config = UART_CONFIG_WLEN_7;break;}case 8:{ui32Config = UART_CONFIG_WLEN_8;break;}default:{ui32Config = UART_CONFIG_WLEN_8;bRetcode = false;break;}}//// Parity.For any invalid values, we set no parity and return an error.//switch(psLineCoding->ui8Parity){case USB_CDC_PARITY_NONE:{ui32Config |= UART_CONFIG_PAR_NONE;break;}case USB_CDC_PARITY_ODD:{ui32Config |= UART_CONFIG_PAR_ODD;break;}case USB_CDC_PARITY_EVEN:{ui32Config |= UART_CONFIG_PAR_EVEN;break;}case USB_CDC_PARITY_MARK:{ui32Config |= UART_CONFIG_PAR_ONE;break;}case USB_CDC_PARITY_SPACE:{ui32Config |= UART_CONFIG_PAR_ZERO;break;}default:{ui32Config |= UART_CONFIG_PAR_NONE;bRetcode = false;break;}}//// Stop bits.Our hardware only supports 1 or 2 stop bits whereas CDC// allows the host to select 1.5 stop bits.If passed 1.5 (or any other// invalid or unsupported value of ui8Stop, we set up for 1 stop bit but// return an error in case the caller needs to Stall or otherwise report// this back to the host.//switch(psLineCoding->ui8Stop){//// One stop bit requested.//case USB_CDC_STOP_BITS_1:{ui32Config |= UART_CONFIG_STOP_ONE;break;}//// Two stop bits requested.//case USB_CDC_STOP_BITS_2:{ui32Config |= UART_CONFIG_STOP_TWO;break;}//// Other cases are either invalid values of ui8Stop or values that we// cannot support so set 1 stop bit but return an error.//default:{ui32Config |= UART_CONFIG_STOP_ONE;bRetcode = false;break;}}//// Set the UART mode appropriately.//ROM_UARTConfigSetExpClk(USB_UART_BASE, ROM_SysCtlClockGet(),psLineCoding->ui32Rate, ui32Config);//// Let the caller know if we had a problem or not.//return(bRetcode);
}//*****************************************************************************
//
// Get the communication parameters in use on the UART.
//
//*****************************************************************************
static void
GetLineCoding(tLineCoding *psLineCoding)
{uint32_t ui32Config;uint32_t ui32Rate;//// Get the current line coding set in the UART.//ROM_UARTConfigGetExpClk(USB_UART_BASE, ROM_SysCtlClockGet(), &ui32Rate,&ui32Config);psLineCoding->ui32Rate = ui32Rate;//// Translate the configuration word length field into the format expected// by the host.//switch(ui32Config & UART_CONFIG_WLEN_MASK){case UART_CONFIG_WLEN_8:{psLineCoding->ui8Databits = 8;break;}case UART_CONFIG_WLEN_7:{psLineCoding->ui8Databits = 7;break;}case UART_CONFIG_WLEN_6:{psLineCoding->ui8Databits = 6;break;}case UART_CONFIG_WLEN_5:{psLineCoding->ui8Databits = 5;break;}}//// Translate the configuration parity field into the format expected// by the host.//switch(ui32Config & UART_CONFIG_PAR_MASK){case UART_CONFIG_PAR_NONE:{psLineCoding->ui8Parity = USB_CDC_PARITY_NONE;break;}case UART_CONFIG_PAR_ODD:{psLineCoding->ui8Parity = USB_CDC_PARITY_ODD;break;}case UART_CONFIG_PAR_EVEN:{psLineCoding->ui8Parity = USB_CDC_PARITY_EVEN;break;}case UART_CONFIG_PAR_ONE:{psLineCoding->ui8Parity = USB_CDC_PARITY_MARK;break;}case UART_CONFIG_PAR_ZERO:{psLineCoding->ui8Parity = USB_CDC_PARITY_SPACE;break;}}//// Translate the configuration stop bits field into the format expected// by the host.//switch(ui32Config & UART_CONFIG_STOP_MASK){case UART_CONFIG_STOP_ONE:{psLineCoding->ui8Stop = USB_CDC_STOP_BITS_1;break;}case UART_CONFIG_STOP_TWO:{psLineCoding->ui8Stop = USB_CDC_STOP_BITS_2;break;}}
}//*****************************************************************************
//
// This function sets or clears a break condition on the redirected UART RX
// line.A break is started when the function is called with \e bSend set to
// \b true and persists until the function is called again with \e bSend set
// to \b false.
//
//*****************************************************************************
static void
SendBreak(bool bSend)
{//// Are we being asked to start or stop the break condition?//if(!bSend){//// Remove the break condition on the line.//ROM_UARTBreakCtl(USB_UART_BASE, false);g_bSendingBreak = false;}else{//// Start sending a break condition on the line.//ROM_UARTBreakCtl(USB_UART_BASE, true);g_bSendingBreak = true;}
}//*****************************************************************************
//
// Handles CDC driver notifications related to control and setup of the device.
//
// \param pvCBData is the client-supplied callback pointer for this channel.
// \param ui32Event identifies the event we are being notified about.
// \param ui32MsgValue is an event-specific value.
// \param pvMsgData is an event-specific pointer.
//
// This function is called by the CDC driver to perform control-related
// operations on behalf of the USB host.These functions include setting
// and querying the serial communication parameters, setting handshake line
// states and sending break conditions.
//
// \return The return value is event-specific.
//
//*****************************************************************************
uint32_t
ControlHandler(void *pvCBData, uint32_t ui32Event,uint32_t ui32MsgValue, void *pvMsgData)
{uint32_t ui32IntsOff;//// Which event are we being asked to process?//switch(ui32Event){//// We are connected to a host and communication is now possible.//case USB_EVENT_CONNECTED:g_bUSBConfigured = true;//// Flush our buffers.//USBBufferFlush(&g_sTxBuffer);USBBufferFlush(&g_sRxBuffer);//// Tell the main loop to update the display.//ui32IntsOff = ROM_IntMasterDisable();g_pcStatus = "Connected";g_ui32Flags |= COMMAND_STATUS_UPDATE;if(!ui32IntsOff){ROM_IntMasterEnable();}break;//// The host has disconnected.//case USB_EVENT_DISCONNECTED:g_bUSBConfigured = false;ui32IntsOff = ROM_IntMasterDisable();g_pcStatus = "Disconnected";g_ui32Flags |= COMMAND_STATUS_UPDATE;if(!ui32IntsOff){ROM_IntMasterEnable();}break;//// Return the current serial communication parameters.//case USBD_CDC_EVENT_GET_LINE_CODING:GetLineCoding(pvMsgData);break;//// Set the current serial communication parameters.//case USBD_CDC_EVENT_SET_LINE_CODING:SetLineCoding(pvMsgData);break;//// Set the current serial communication parameters.//case USBD_CDC_EVENT_SET_CONTROL_LINE_STATE:SetControlLineState((uint16_t)ui32MsgValue);break;//// Send a break condition on the serial line.//case USBD_CDC_EVENT_SEND_BREAK:SendBreak(true);break;//// Clear the break condition on the serial line.//case USBD_CDC_EVENT_CLEAR_BREAK:SendBreak(false);break;//// Ignore SUSPEND and RESUME for now.//case USB_EVENT_SUSPEND:case USB_EVENT_RESUME:break;//// We don't expect to receive any other events.Ignore any that show// up in a release build or hang in a debug build.//default:
#ifdef DEBUGwhile(1);
#elsebreak;
#endif}return(0);
}//*****************************************************************************
//
// Handles CDC driver notifications related to the transmit channel (data to
// the USB host).
//
// \param ui32CBData is the client-supplied callback pointer for this channel.
// \param ui32Event identifies the event we are being notified about.
// \param ui32MsgValue is an event-specific value.
// \param pvMsgData is an event-specific pointer.
//
// This function is called by the CDC driver to notify us of any events
// related to operation of the transmit data channel (the IN channel carrying
// data to the USB host).
//
// \return The return value is event-specific.
//
//*****************************************************************************
uint32_t
TxHandler(void *pvCBData, uint32_t ui32Event, uint32_t ui32MsgValue,void *pvMsgData)
{//// Which event have we been sent?//switch(ui32Event){case USB_EVENT_TX_COMPLETE://// Since we are using the USBBuffer, we don't need to do anything// here.//break;//// We don't expect to receive any other events.Ignore any that show// up in a release build or hang in a debug build.//default:
#ifdef DEBUGwhile(1);
#elsebreak;
#endif}return(0);
}//*****************************************************************************
//
// Handles CDC driver notifications related to the receive channel (data from
// the USB host).
//
// \param ui32CBData is the client-supplied callback data value for this channel.
// \param ui32Event identifies the event we are being notified about.
// \param ui32MsgValue is an event-specific value.
// \param pvMsgData is an event-specific pointer.
//
// This function is called by the CDC driver to notify us of any events
// related to operation of the receive data channel (the OUT channel carrying
// data from the USB host).
//
// \return The return value is event-specific.
//
//*****************************************************************************
uint32_t
RxHandler(void *pvCBData, uint32_t ui32Event, uint32_t ui32MsgValue,void *pvMsgData)
{uint32_t ui32Count;//// Which event are we being sent?//switch(ui32Event){//// A new packet has been received.//case USB_EVENT_RX_AVAILABLE:{//// Feed some characters into the UART TX FIFO and enable the// interrupt so we are told when there is more space.//USBUARTPrimeTransmit(USB_UART_BASE);ROM_UARTIntEnable(USB_UART_BASE, UART_INT_TX);break;}//// We are being asked how much unprocessed data we have still to// process. We return 0 if the UART is currently idle or 1 if it is// in the process of transmitting something. The actual number of// bytes in the UART FIFO is not important here, merely whether or// not everything previously sent to us has been transmitted.//case USB_EVENT_DATA_REMAINING:{//// Get the number of bytes in the buffer and add 1 if some data// still has to clear the transmitter.//ui32Count = ROM_UARTBusy(USB_UART_BASE) ? 1 : 0;return(ui32Count);}//// We are being asked to provide a buffer into which the next packet// can be read. We do not support this mode of receiving data so let// the driver know by returning 0. The CDC driver should not be sending// this message but this is included just for illustration and// completeness.//case USB_EVENT_REQUEST_BUFFER:{return(0);}//// We don't expect to receive any other events.Ignore any that show// up in a release build or hang in a debug build.//default:
#ifdef DEBUGwhile(1);
#elsebreak;
#endif}return(0);
}//*****************************************************************************
//
// This is the main application entry function.
//
//*****************************************************************************
int
main(void)
{uint32_t ui32TxCount;uint32_t ui32RxCount;//// Enable lazy stacking for interrupt handlers.This allows floating-point// instructions to be used within interrupt handlers, but at the expense of// extra stack usage.//ROM_FPULazyStackingEnable();//// Set the clocking to run from the PLL at 50MHz//ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |SYSCTL_XTAL_16MHZ);//// Configure the required pins for USB operation.//ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);ROM_GPIOPinTypeUSBAnalog(GPIO_PORTD_BASE, GPIO_PIN_5 | GPIO_PIN_4);//// Enable the GPIO port that is used for the on-board LED.//ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);//// Enable the GPIO pins for the LED (PF2 & PF3).//ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_3|GPIO_PIN_2);//// Not configured initially.//g_bUSBConfigured = false;//// Enable the UART that we will be redirecting.//ROM_SysCtlPeripheralEnable(USB_UART_PERIPH);//// Enable and configure the UART RX and TX pins//ROM_SysCtlPeripheralEnable(TX_GPIO_PERIPH);ROM_SysCtlPeripheralEnable(RX_GPIO_PERIPH);ROM_GPIOPinTypeUART(TX_GPIO_BASE, TX_GPIO_PIN);ROM_GPIOPinTypeUART(RX_GPIO_BASE, RX_GPIO_PIN);//// TODO: Add code to configure handshake GPIOs if required.////// Set the default UART configuration.//ROM_UARTConfigSetExpClk(USB_UART_BASE, ROM_SysCtlClockGet(),DEFAULT_BIT_RATE, DEFAULT_UART_CONFIG);ROM_UARTFIFOLevelSet(USB_UART_BASE, UART_FIFO_TX4_8, UART_FIFO_RX4_8);//// Configure and enable UART interrupts.//ROM_UARTIntClear(USB_UART_BASE, ROM_UARTIntStatus(USB_UART_BASE, false));ROM_UARTIntEnable(USB_UART_BASE, (UART_INT_OE | UART_INT_BE | UART_INT_PE |UART_INT_FE | UART_INT_RT | UART_INT_TX | UART_INT_RX));//// Enable the system tick.//ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / SYSTICKS_PER_SECOND);ROM_SysTickIntEnable();ROM_SysTickEnable();//// Initialize the transmit and receive buffers.//USBBufferInit(&g_sTxBuffer);USBBufferInit(&g_sRxBuffer);//// Set the USB stack mode to Device mode with VBUS monitoring.//USBStackModeSet(0, eUSBModeForceDevice, 0);//// Pass our device information to the USB library and place the device// on the bus.//USBDCDCInit(0, &g_sCDCDevice);//// Clear our local byte counters.//ui32RxCount = 0;ui32TxCount = 0;//// Enable interrupts now that the application is ready to start.//ROM_IntEnable(USB_UART_INT);//// Main application loop.//while(1){//// Have we been asked to update the status display?//if(g_ui32Flags & COMMAND_STATUS_UPDATE){//// Clear the command flag//ROM_IntMasterDisable();g_ui32Flags &= ~COMMAND_STATUS_UPDATE;ROM_IntMasterEnable();}//// Has there been any transmit traffic since we last checked?//if(ui32TxCount != g_ui32UARTTxCount){//// Turn on the Green LED.//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, GPIO_PIN_3);//// Delay for a bit.//SysCtlDelay(ROM_SysCtlClockGet() / 3 / 20);//// Turn off the Green LED.//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, 0);//// Take a snapshot of the latest transmit count.//ui32TxCount = g_ui32UARTTxCount;}//// Has there been any receive traffic since we last checked?//if(ui32RxCount != g_ui32UARTRxCount){//// Turn on the Blue LED.//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);//// Delay for a bit.//SysCtlDelay(ROM_SysCtlClockGet() / 3 / 20);//// Turn off the Blue LED.//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);//// Take a snapshot of the latest receive count.//ui32RxCount = g_ui32UARTRxCount;}}
}

user4619179：

回复 xyz549040622:

谢谢。那再请问一下，我用TM4C129读取一块其他厂家自定义的USB设备时需要在传输控制函数USBHCDControlTransfer（）内断点运行才能正确读取出信息，如果没有断点调试运行的话就会进入这个状态错误if(g_sUSBHEP0State.iState == eEP0StateError)，同样的程序如果是键盘、鼠标等设备插入是没有问题的。通过把那个厂家USB设备插入电脑发现它是usb1.1版本的，不知是否跟这个有关系？

Maka Luo：

USB作为什么HOST那种模式？

Maka Luo：

你可以参照C:\ti\TivaWare_C_Series-2.1.1.71\examples\boards\dk-tm4c123g\usb_host_xx例程

user4619179：

回复 Maka Luo:

就是要让TM4C129主机与USB模块进行类似于串口那样的通讯模式，主机发送指令，USB模块返回数据。

user4619179：

回复 Maka Luo:

我就是参考了 usb_host_keyboard例程的。