现在手上有一块TM4C123GXL launchpad，想做一个模拟USB鼠标，参考了TivaWare中提供的 “usb_dev_gamepad” 例程还是没有头绪，想问下各位大神几个问题：
1.用开发板做一个模拟USB鼠标需要了解什么知识？
2.下面usblib.h代码分别是什么模式？在什么时候使用？
typedef enum
{
//
//! Operate in USB device mode with active monitoring of VBUS and the
//! ID pin must be pulled to a logic high value.
//
eUSBModeDevice = 0,
//
//! Operate in USB host mode with active monitoring of VBUS and the ID pin
//! must be pulled to a logic low value.
//
eUSBModeHost,
//
//! Operate as an On-The-Go device which requires both VBUS and ID to be
//! connected directly to the USB controller from the USB connector.
//
eUSBModeOTG,
//
//! A marker indicating that no USB mode has yet been set by the
//! application.
//
eUSBModeNone,
//
//! Force host mode so that the VBUS and ID pins are not used or monitored
//! by the USB controller.
//
eUSBModeForceHost,
//
//! Forcing device mode so that the VBUS and ID pins are not used or
//! monitored by the USB controller.
//
eUSBModeForceDevice,
}
tUSBMode;
3.在usblib.h文件中有：
extern void USBStackModeSet(uint32_t ui32Index, tUSBMode iUSBMode, tUSBModeCallback pfnCallback);
想问下这个函数的三个参数分别代表什么？如何使用？
4.自己按例程改的代码如下，在main中运行到USBStackModeSet(0, eUSBModeForceDevice, 0);时会跳入错误函数，想了解这块怎么写？（main.c 82行）
以下为代码，其他用的都是官方代码就不贴了
main.c
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/hw_gpio.h"
#include "inc/hw_sysctl.h"
#include "driverlib/adc.h"
#include "driverlib/debug.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "usblib/usblib.h"
#include "usblib/usbhid.h"
#include "usblib/device/usbdevice.h"
#include "usblib/device/usbdhid.h"
#include "usblib/device/usbdhidmouse.h"
#include "usb_mouse_structs.h"
//#include "drivers/buttons.h"
#include "utils/uartstdio.h"
#include "drivers/rocker.h"
//extern void USBStackModeSet(uint32_t ui32Index, tUSBMode iUSBMode, tUSBModeCallback pfnCallback);
//void *USBDHIDMouseInit(uint32_t ui32Index, tUSBDHIDMouseDevice *psMouseDevice);
//uint32_t USBDHIDMouseStateChange(void *pvMouseDevice, int8_t i8DeltaX, int8_t i8DeltaY, uint8_t ui8Buttons);
void ConfigureUART(void);
uint32_t MouseHandler(void *pvCBData, uint32_t ui32Event, uint32_t ui32MsgData, void *pvMsgData);
volatile enum
{
//
// Not yet configured.
//
eStateNotConfigured,
//
// Connected and not waiting on data to be sent.
//
eStateIdle,
//
// Suspended.
//
eStateSuspend,
//
// Connected and waiting on data to be sent out.
//
eStateSending
}
g_iGamepadState;
int main(void)
{
ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
//LED_RED
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);
ConfigureUART();
// Not configured initially.
g_iGamepadState = eStateNotConfigured;
//
// Enable the GPIO peripheral used for USB, and configure the USB
// pins.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
SysCtlGPIOAHBEnable(SYSCTL_PERIPH_GPIOD);
ROM_GPIOPinTypeUSBAnalog(GPIO_PORTD_AHB_BASE, GPIO_PIN_4 | GPIO_PIN_5);
// ButtonsInit();
// ADCInit();
UARTprintf("Configuring USB\n");
USBStackModeSet(0, eUSBModeForceDevice, 0);
USBDHIDMouseInit(0, &g_sMouseDevice);
while(1)
USBDHIDMouseStateChange(&g_sMouseDevice, 1, 1, 1);
return 0;
}
void
ConfigureUART(void)
{
//
// Enable the GPIO Peripheral used by the UART.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
//
// Enable UART0
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
//
// Configure GPIO Pins for UART mode.
//
ROM_GPIOPinConfigure(GPIO_PA0_U0RX);
ROM_GPIOPinConfigure(GPIO_PA1_U0TX);
ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
//
// Use the internal 16MHz oscillator as the UART clock source.
//
UARTClockSourceSet(UART0_BASE, UART_CLOCK_PIOSC);
//
// Initialize the UART for console I/O.
//
UARTStdioConfig(0, 115200, 16000000);
}
uint32_t MouseHandler(void *pvCBData, uint32_t ui32Event,
uint32_t ui32MsgData, void *pvMsgData)
{
}
usb_mouse_structs.c
#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_types.h"
#include "usblib/usblib.h"
#include "usblib/usbhid.h"
#include "usblib/usb-ids.h"
#include "usblib/device/usbdevice.h"
#include "usblib/device/usbdcomp.h"
#include "usblib/device/usbdhid.h"
#include "usblib/device/usbdhidmouse.h"
#include "usb_mouse_structs.h"
//****************************************************************************
//
// The languages supported by this device.
//
//****************************************************************************
const uint8_t g_pui8LangDescriptor[] =
{
4,
USB_DTYPE_STRING,
USBShort(USB_LANG_EN_US)
};
//****************************************************************************
//
// The manufacturer string.
//
//****************************************************************************
const uint8_t g_pui8ManufacturerString[] =
{
(17 + 1) * 2,
USB_DTYPE_STRING,
'T', 0, 'e', 0, 'x', 0, 'a', 0, 's', 0, ' ', 0, 'I', 0, 'n', 0, 's', 0,
't', 0, 'r', 0, 'u', 0, 'm', 0, 'e', 0, 'n', 0, 't', 0, 's', 0,
};
//****************************************************************************
//
// The product string.
//
//****************************************************************************
const uint8_t g_pui8ProductString[] =
{
(17 + 1) * 2,
USB_DTYPE_STRING,
'E', 0, 'x', 0, 'a', 0, 'm', 0, 'p', 0, 'l', 0, 'e', 0, ' ', 0,
'G', 0, 'a', 0, 'm', 0, 'e', 0, ' ', 0, 'P', 0, 'a', 0, 'd', 0, ' ', 0,
};
//****************************************************************************
//
// The serial number string.
//
//****************************************************************************
const uint8_t g_pui8SerialNumberString[] =
{
(8 + 1) * 2,
USB_DTYPE_STRING,
'1', 0, '2', 0, '3', 0, '4', 0, '5', 0, '6', 0, '7', 0, '8', 0
};
//*****************************************************************************
//
// The interface description string.
//
//*****************************************************************************
const uint8_t g_pui8HIDInterfaceString[] =
{
(21 + 1) * 2,
USB_DTYPE_STRING,
'H', 0, 'I', 0, 'D', 0, ' ', 0, 'G', 0, 'a', 0, 'm', 0, 'e', 0,
'p', 0, 'a', 0, 'd', 0, ' ', 0, 'I', 0, 'n', 0, 't', 0, 'e', 0,
'r', 0, 'f', 0, 'a', 0, 'c', 0, 'e', 0
};
//*****************************************************************************
//
// The configuration description string.
//
//*****************************************************************************
const uint8_t g_pui8ConfigString[] =
{
(25 + 1) * 2,
USB_DTYPE_STRING,
'H', 0, 'I', 0, 'D', 0, ' ', 0, 'G', 0, 'a', 0, 'm', 0, 'e', 0,
'p', 0, 'a', 0, 'd', 0, ' ', 0, 'C', 0, 'o', 0, 'n', 0, 'f', 0,
'i', 0, 'g', 0, 'u', 0, 'r', 0, 'a', 0, 't', 0, 'i', 0, 'o', 0,
'n', 0
};
//*****************************************************************************
//
// The descriptor string table.
//
//*****************************************************************************
const uint8_t * const g_ppui8StringDescriptors[] =
{
g_pui8LangDescriptor,
g_pui8ManufacturerString,
g_pui8ProductString,
g_pui8SerialNumberString,
g_pui8HIDInterfaceString,
g_pui8ConfigString
};
#define NUM_STRING_DESCRIPTORS (sizeof(g_ppui8StringDescriptors) / \
sizeof(uint8_t *))
//*****************************************************************************
//
// The HID game pad device initialization and customization structures.
//
//*****************************************************************************
tUSBDHIDMouseDevice g_sMouseDevice =
{
USB_VID_TI_1CBE,
USB_PID_MOUSE,
500,
USB_CONF_ATTR_SELF_PWR | USB_CONF_ATTR_RWAKE,
USB_PID_MOUSE,
(void *)&g_sMouseDevice,
g_ppui8StringDescriptors,
NUM_STRING_DESCRIPTORS
};
感谢各位工程师、大佬们赐教。
编译环境：win7,CCS6.2
