EPI工作模式：

1. 同步動態(tài)隨機訪問存儲器（SDRAM）模式：支持16位寬的SDRAM,最高達到50MHZ，復用地址與數(shù)據(jù)管腳。
2. 主機總線(HB)模式：傳統(tǒng)的8/16位微控制器總線接口，可兼容PIC,8051，AVR等單片機。可訪問SRAM，NORFLSH其他的并行總線設備，非復用下尋址能力達到1MB，復用模式下尋址可以達到256MB
3. 通用模式：可以通CPLD或者FPGA進行快速的數(shù)據(jù)交換，數(shù)據(jù)寬度可以達到32位，數(shù)據(jù)速率可以達到150MB/S.
4. 并行GPIO模式：1到32位，必須經(jīng)由FIFO輸入輸出，速度可控。

//*****************************************************************************
// 頭文件包含區(qū)
//*****************************************************************************
#include "inc/lm3s9b96.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_nvic.h"
#include "inc/hw_types.h"
#include "inc/hw_i2c.h"
#include "driverlib/i2c.h"
#include "driverlib/ethernet.h"
#include "driverlib/flash.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"
#include "driverlib/interrupt.h"
#include "driverlib/sysctl.h"
#include "driverlib/systick.h"
#include "driverlib/uart.h"
#include "driverlib/watchdog.h"
#include "driverlib/epi.h"
#include "utils/locator.h"
#include "utils/lwiplib.h"
#include "utils/uartstdio.h"
#include "utils/ustdlib.h"
#include "grlib/grlib.h"
#include "httpserver_raw/httpd.h"
#include "drivers/kitronix320x240x16_ssd2119_8bit.h"
#include "drivers/set_pinout.h"

//*****************************************************************************
// 數(shù)據(jù)類型定義區(qū)
//*****************************************************************************
typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef unsigned long DWORD;
typedef enum {FALSE = 0, TRUE = !FALSE} bool;


//*****************************************************************************
// 宏定義區(qū)
//*****************************************************************************
/* Defines for setting up the system clock -----------------------------------*/
#define SYSTICKHZ 100
#define SYSTICKMS (1000 / SYSTICKHZ)
#define SYSTICKUS (1000000 / SYSTICKHZ)
#define SYSTICKNS (1000000000 / SYSTICKHZ)


/* 在lm3s9b96.h中定義 --------------------------------------------------------*/
#define EPI_O_CFG 0x400D0000
#define EPI_O_HB16CFG 0x400D0010
#define EPI_O_HB16CFG2 0x400D0014
#define EPI_O_ADDRMAP 0x400D001c
#define EPI_O_BAUD 0x400D0004

#define EPI_PORTC_PINS (GPIO_PIN_7 | GPIO_PIN_6 | GPIO_PIN_5 | GPIO_PIN_4)
#define EPI_PORTD_PINS (GPIO_PIN_3 | GPIO_PIN_2)
#define EPI_PORTE_PINS (GPIO_PIN_1 | GPIO_PIN_0)
#define EPI_PORTF_PINS (GPIO_PIN_5 | GPIO_PIN_4)
#define EPI_PORTG_PINS (GPIO_PIN_7 | GPIO_PIN_1 | GPIO_PIN_0)
#define EPI_PORTH_PINS (GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 | GPIO_PIN_2 |
GPIO_PIN_1 | GPIO_PIN_0)
#define EPI_PORTJ_PINS (GPIO_PIN_6 | GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 |
GPIO_PIN_2 | GPIO_PIN_1 | GPIO_PIN_0)

//*****************************************************************************
// 全局變量定義區(qū)
//*****************************************************************************
volatile WORD usDI16 = 0x0000;
static volatile WORD *g_pusEPIPER;

//*****************************************************************************
// 函數(shù)聲明區(qū)
//*****************************************************************************
extern void fs_init(void);
extern void fs_tick(unsigned long ulTickMS);



//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void __error__(char *pcFilename, unsigned long ulLine)
{
}
#endif


//*****************************************************************************
//
// 系統(tǒng)時鐘初始化函數(shù)
//
//*****************************************************************************
void SysClk_Init(void)
{
// 配置系統(tǒng)主時鐘, 使用外部晶振16M.
SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
}

//*****************************************************************************
//
// This example demonstrates the use of the Ethernet Controller.
//
//*****************************************************************************
int main(void)
{
// 系統(tǒng)時鐘初始化為16MHz
SysClk_Init();

// 使能A~J管腳
// PinoutSet();

// 開總中斷
IntMasterEnable();

// The EPI0 peripheral must be enabled for use
SysCtlPeripheralEnable(SYSCTL_PERIPH_EPI0);

// EPI0 is used with multiple pins on Port C, E, F, G, H, J
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOH);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);

GPIOPadConfigSet(GPIO_PORTC_BASE, EPI_PORTC_PINS, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);
// GPIOPadConfigSet(GPIO_PORTD_BASE, EPI_PORTD_PINS, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);
GPIOPadConfigSet(GPIO_PORTE_BASE, EPI_PORTE_PINS, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);
GPIOPadConfigSet(GPIO_PORTF_BASE, EPI_PORTF_PINS, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);
GPIOPadConfigSet(GPIO_PORTG_BASE, EPI_PORTG_PINS, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);
GPIOPadConfigSet(GPIO_PORTH_BASE, EPI_PORTH_PINS, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);
GPIOPadConfigSet(GPIO_PORTJ_BASE, EPI_PORTJ_PINS, GPIO_STRENGTH_8MA, GPIO_PIN_TYPE_STD);

GPIODirModeSet(GPIO_PORTC_BASE, EPI_PORTC_PINS, GPIO_DIR_MODE_HW);
// GPIODirModeSet(GPIO_PORTD_BASE, EPI_PORTD_PINS, GPIO_DIR_MODE_HW);

GPIODirModeSet(GPIO_PORTE_BASE, EPI_PORTE_PINS, GPIO_DIR_MODE_HW);
GPIODirModeSet(GPIO_PORTF_BASE, EPI_PORTF_PINS, GPIO_DIR_MODE_HW);
GPIODirModeSet(GPIO_PORTG_BASE, EPI_PORTG_PINS, GPIO_DIR_MODE_HW);
GPIODirModeSet(GPIO_PORTH_BASE, EPI_PORTH_PINS, GPIO_DIR_MODE_HW);
GPIODirModeSet(GPIO_PORTJ_BASE, EPI_PORTJ_PINS, GPIO_DIR_MODE_HW);

// configures the internal pin muxes to set the EPI pins for use with EPI
GPIOPinConfigure(GPIO_PH3_EPI0S0);
GPIOPinConfigure(GPIO_PH2_EPI0S1);
GPIOPinConfigure(GPIO_PC4_EPI0S2);
GPIOPinConfigure(GPIO_PC5_EPI0S3);
GPIOPinConfigure(GPIO_PC6_EPI0S4);
GPIOPinConfigure(GPIO_PC7_EPI0S5);
GPIOPinConfigure(GPIO_PH0_EPI0S6);
GPIOPinConfigure(GPIO_PH1_EPI0S7);
GPIOPinConfigure(GPIO_PE0_EPI0S8);
GPIOPinConfigure(GPIO_PE1_EPI0S9);
GPIOPinConfigure(GPIO_PH4_EPI0S10);
GPIOPinConfigure(GPIO_PH5_EPI0S11);
GPIOPinConfigure(GPIO_PF4_EPI0S12);
GPIOPinConfigure(GPIO_PG0_EPI0S13);
GPIOPinConfigure(GPIO_PG1_EPI0S14);
GPIOPinConfigure(GPIO_PF5_EPI0S15);
GPIOPinConfigure(GPIO_PJ0_EPI0S16);
GPIOPinConfigure(GPIO_PJ1_EPI0S17);
GPIOPinConfigure(GPIO_PJ2_EPI0S18);
GPIOPinConfigure(GPIO_PJ3_EPI0S19);
// GPIOPinConfigure(GPIO_PD2_EPI0S20);
// GPIOPinConfigure(GPIO_PD3_EPI0S21);
// GPIOPinConfigure(GPIO_PB5_EPI0S22);
// GPIOPinConfigure(GPIO_PB4_EPI0S23);
GPIOPinConfigure(GPIO_PE2_EPI0S24);
GPIOPinConfigure(GPIO_PE3_EPI0S25);
GPIOPinConfigure(GPIO_PJ4_EPI0S28);
GPIOPinConfigure(GPIO_PJ5_EPI0S29);
GPIOPinConfigure(GPIO_PJ6_EPI0S30);
GPIOPinConfigure(GPIO_PG7_EPI0S31);

// Configure the GPIO pins for EPI mode
GPIOPinTypeEPI(GPIO_PORTC_BASE, EPI_PORTC_PINS);
GPIOPinTypeEPI(GPIO_PORTE_BASE, EPI_PORTE_PINS);
GPIOPinTypeEPI(GPIO_PORTF_BASE, EPI_PORTF_PINS);
GPIOPinTypeEPI(GPIO_PORTG_BASE, EPI_PORTG_PINS);
GPIOPinTypeEPI(GPIO_PORTH_BASE, EPI_PORTH_PINS);
GPIOPinTypeEPI(GPIO_PORTJ_BASE, EPI_PORTJ_PINS);

// Sets the clock divider for the EPI module. EPIClock = SysClk.
EPIDividerSet(EPI0_BASE, 0);

// Sets the usage mode of the EPI module. EPI_MODE_HB16
HWREG(EPI_O_CFG) = (1 << 4) | 0x1;

// 讀選通信號RDn(低電平有效), 最長等待時間(可以永遠掛起), 寫等待態(tài)(無等待態(tài)), 讀等待態(tài)(1個等待態(tài))
// 字節(jié)選擇配置(數(shù)據(jù)按照16位寬度讀寫), 主機并行總線的子模式(ADNOMUX子模式)
HWREG(EPI_O_HB16CFG) = (1 << 20) | (0x00 << 8) | (0x01 << 4) | (1 << 0);

// 字訪問模式(使能字訪問模式), 雙片選波特率(相同波特率), 片選配置(EPI0S30用作片選信號CSn)
HWREG(EPI_O_HB16CFG2) = (1 << 31) | (0x01 << 24);

// 片外外設空間大小64kB(低地址范圍0x0000~0xFFFF)，片外外設基地址(0xA000 0000)
HWREG(EPI_O_ADDRMAP) = (0x5 << 4);

/* 初始化完畢，就可以使用讀取數(shù)據(jù)了 ----------------------------------------*/

// 指向外設基地址0xA000 0000處的指針
g_pusEPIPER = (unsigned short *)0xA0000000;

// 從外設基地址0xA0000000處，讀取16位數(shù)據(jù)
usDI16 = *g_pusEPIPER;
usDI16 = ~usDI16;

// Loop forever. All the work is done in interrupt handlers.
while (1)
{
}
}


//*****************************************************************************
//
// Required by lwIP library to support any host-related timer functions.
//
//*****************************************************************************
void lwIPHostTimerHandler(void)
{
}

//*****************************************************************************
//
// The interrupt handler for the SysTick interrupt.
//
//*****************************************************************************
void SysTickIntHandler(void)
{
// Call the lwIP timer handler.
lwIPTimer(SYSTICKMS);

// Run the file system tick handler.
fs_tick(SYSTICKMS);
}