首先感谢上一篇转载文章的作者给出的参考，下面是一些自己在调试过程中的一些步骤:
首先把代码贴上来：
//--------------------------------------------------------------------------------------------
-
//DSP28377 利用EMIF控制网口DM9000芯片收发数据
//--------------------------------------------------------------------------------------------
-
#include "F28x_Project.h"
void Emif1Initialize(void);
//emif 映射地址
#define ASRAM_CS3_START_ADDR 0x37FFF0
#define ASRAM_CS3_SIZE 0x8000
extern void setup_emif1_pinmux_async_16bit(Uint16);
//地址指定；通过操作指针实现地址对应数据操作
Uint16 *ADDR_POINT = (Uint16 *)(ASRAM_CS3_START_ADDR);
Uint16 *DATA_POINT = (Uint16 *)(ASRAM_CS3_START_ADDR + 1);
#define EMIF1 0
//##########DM9000 SETING ######################
#define DM_NCR 0X00
#define DM_NSR 0X01
#define DM_TCR 0X02
#define DM_RCR 0X05
#define DM_BPTR 0X08
#define DM_FCTR 0X09
#define DM_RTFCR 0X0A
#define DM_EPCR 0X0B
#define DM_EPAR 0X0C
#define DM_EPDRL 0X0D
#define DM_EPDRH 0X0E
#define DM_PAB0 0X10
#define DM_PAB1 0X11
#define DM_PAB2 0X12
#define DM_PAB3 0X13
#define DM_PAB4 0X14
#define DM_PAB5 0X15
#define DM_GPCR 0X1E
#define DM_GPR 0X1F
#define DM_SMCR 0X2F
#define DM_MRCMDX 0XF0
#define DM_MRCMD 0XF2
#define DM_MWCMD 0XF8
#define DM_TXPLH 0XFD
#define DM_TXPLL 0XFC
#define DM_ISR 0XFE
#define DM_IMR 0XFF
#define PHY_BADDR 0X40
#define PHY_WCMD 0X0A
#define PHY_RCMD 0X0C
Uint16 NODE_ADDR[6] = {0X5A , 0X5A , 0X5A , 0X5A , 0X5A , 0X5A};
Uint16 databuffer[540];
Uint16 buffersize = 520;
//---------------------------------------------------------------------
// 向DM9000内部寄存器写值
void iow(Uint16 IOADDR , Uint16 REGDARA){
*ADDR_POINT = IOADDR;
DELAY_US(20);
*DATA_POINT = REGDARA;
DELAY_US(20);
}
//---------------------------------------------------------------------
// 读取DM9000内部寄存器的值
Uint16 ior(Uint16 IOADDR){
DELAY_US(20);
*ADDR_POINT = IOADDR;
DELAY_US(20);
return(*DATA_POINT);
}
//---------------------------------------------------------------------
// 往固定地址写值
void outw(Uint16 REGDATA , Uint16 addr_data_type){
if(addr_data_type == 1) *DATA_POINT = REGDATA;
else if(addr_data_type == 2) *ADDR_POINT = REGDATA;
DELAY_US(50);
}
//---------------------------------------------------------------------
//读取寄存器的值
Uint16 inw(){
return *DATA_POINT;
}
//---------------------------------------------------------------------
//写物理接口PHY寄存器的值
void phy_write(Uint16 offset , Uint16 REGIN){
iow(DM_EPAR , (offset | PHY_BADDR));
iow(DM_EPDRH , (REGIN >> 8) & 0x00ff);
iow(DM_EPDRL , (REGIN & 0x00ff));
iow(DM_EPCR , PHY_WCMD);
while((ior(DM_EPCR) & 1));
DELAY_US(200);
iow(DM_EPCR , 0x08);
}
//---------------------------------------------------------------------
//读物理接口PHY寄存器的值
Uint16 phy_reaad(Uint16 offset , Uint16 REGIN){
Uint16 returndata=0;
iow(DM_EPAR , (offset | PHY_BADDR));
iow(DM_EPCR , PHY_RCMD);
while((ior(DM_EPCR) & 1));
DELAY_US(200);
iow(DM_EPCR , 0x08);
returndata = ior(DM_EPDRH);
returndata = (returndata << 8) | ior(DM_EPDRL);
return returndata;
}
//---------------------------------------------------------------------
//DM9000 初始化
void DM9000_INIT(){
//开启PHY
iow(DM_GPR , 0X00);
//softerware reset and setting as normal mode(TWICE)
iow(DM_NCR , 0X01);
DELAY_US(10000);
iow(DM_NCR , 0X00);
iow(DM_NCR , 0X01);
DELAY_US(10000);
iow(DM_NCR , 0X00);
//clear the RX/TX flag
iow(DM_NSR, 0x2C);
iow(DM_ISR, 0x3F);
// //write the NODE_ADDR to physical register
iow(DM_PAB0 , NODE_ADDR[0]);
iow(DM_PAB1 , NODE_ADDR[1]);
iow(DM_PAB2 , NODE_ADDR[2]);
iow(DM_PAB3 , NODE_ADDR[3]);
iow(DM_PAB4 , NODE_ADDR[4]);
iow(DM_PAB5 , NODE_ADDR[5]);
//Eenable RX/TX function
iow(DM_RCR , 0x31);//去掉混杂模式//iow(DM_RCR , 0x31);
iow(DM_TCR , 0x00);
//setting phy of dm9000
phy_write(0x00 , 0x8000);
DELAY_US(100000);
phy_write(0x04 , 0x01e1 | 0x0400);
DELAY_US(100000);
//set back presure threshold register
iow(DM_BPTR , 0x3F);
iow(DM_FCTR , 0x3A);
iow(DM_RTFCR , 0xFF);
iow(DM_SMCR , 0x00);
//clear all flags agin
iow(DM_NSR, 0x2C);
iow(DM_ISR, 0x3B);
//open the rx interrupt
iow(DM_IMR , 0x81);
DELAY_US(1000);
}
//--------------------------------------------------------------------------------------
//发送网络包
void PACKE_SEND(Uint16 *datain , Uint16 datalen){
Uint16 i = 0;
Uint16 len=0;
//关闭RX中断
iow(DM_IMR , 0x80);
//write length to internal sram
//将包的长度写入到寄存器中；
len = datalen * 2;
iow(DM_TXPLH , ((len&0xff00)>>8));
iow(DM_TXPLL , len&0x00ff);
//DM_MWCMD is pointer to internal TX sdram address
outw(DM_MWCMD , 2);
//write data int internal sram
for(i = 0; i < datalen ; i++) outw(datain[i] , 1);
//start transmit
iow(DM_TCR , 0X01);
// wait transmit complit
while((ior(DM_NSR) & 0x0c) == 0);
DELAY_US(20);
//clear the tx flag
iow(DM_NSR , 0X2C);
//oprn rx intterupt
iow(DM_IMR , 0x81);
}
//----------------------------------------------------------------------------------------
//接受网络包
//在调试的过程中；通过一片DSP发送1040个数据（8bit）；并设置发送长度为1040；但对于接受的网络包
而言；不仅仅会在接收到的网络包前包含4个
//信息byte；分别是接受准备；接受状态位；帧长度（2byte）；后面跟随1040个数据（byte）；后面还会
跟随4个byte位；作用不知；同时接受到的
//帧长度为1044个；所以在读取数据是必须读取完成整个1044个数据；rx指针才会自动跳转到SRAM的首地址
等待下一次触发
void PACKE_RECIVE(Uint16 *datain , Uint16 datalen){
Uint16 i = 0;
Uint16 rx_length = 0;
Uint16 rx_status = 0;
Uint16 state = 0;
Uint16 ready = 0;
//获取中断标识
state = ior(DM_ISR);
if(state & 0x01){
//清除中断标志
iow(DM_ISR , 0x01);
//将rx指针指向SRAM(此指针的指向方式为读取数据后指针不会自动增加)
ready = ior(DM_MRCMDX);
DELAY_US(200);
//在读取一次状态寄存器
ready = ior(DM_MRCMDX);
//取状态寄存器的低8位
ready = ready & 0X00FF;
if(ready == 0x01){
//将rx指针指向SRAM(此指针的指向方式为读取数据后指针会自动增加)
outw(DM_MRCMD , 2);
//读取状态信息
rx_status = inw();
//读取帧字节数
rx_length = inw();
//获取数据
if((rx_length % 2) == 1) rx_length = rx_length + 1;
for(i=0;i<rx_length/2;i++){
*(datain + i) = inw();
}
ESTOP0;
}
else if(ready == 0x00)
{
/*iow(DM_IMR , 0x80);
iow(DM_ISR , 0x0F);
iow(DM_RCR , 0x00);
iow(DM_NCR , 0x01);
DELAY_US(20);
iow(DM_NSR, 0x2C);
iow(DM_ISR, 0x80);
iow(DM_RCR, 0x39);*/
ESTOP0;
}
}
iow(DM_ISR , 0x01);
iow(DM_IMR , 0x81);
}
void main(void)
{
Uint16 i = 0;
Uint16 datalen = 0;
InitSysCtrl();
DINT;
InitPieCtrl();
EALLOW;
IER = 0x0000;
IFR = 0x0000;
EDIS;
InitPieVectTable();
Emif1Initialize();
EALLOW;
ClkCfgRegs.PERCLKDIVSEL.bit.EMIF1CLKDIV = 0x1;
EDIS;
EALLOW;
Emif1ConfigRegs.EMIF1MSEL.all = 0x93A5CE71;
Emif1ConfigRegs.EMIF1ACCPROT0.all = 0x0;
if (Emif1ConfigRegs.EMIF1ACCPROT0.all != 0x0)
{
while(1);
}
Emif1ConfigRegs.EMIF1COMMIT.all = 0x1;
if(Emif1ConfigRegs.EMIF1COMMIT.all != 0x1)
{
while(1);
}
// Lock the configuration so that EMIF1COMMIT register can't be changed any more.
Emif1ConfigRegs.EMIF1LOCK.all = 0x1;
if (Emif1ConfigRegs.EMIF1LOCK.all != 1)
{
while(1);
}
EDIS;
setup_emif1_pinmux_async_16bit(0);
Emif1Regs.ASYNC_CS3_CR.all = ( EMIF_ASYNC_ASIZE_16 | // 16Bit Memory Interface
EMIF_ASYNC_TA_3 | // Turn Around time of 2 EmifClock
EMIF_ASYNC_RHOLD_1 | // Read Hold time of 1 EmifClock
EMIF_ASYNC_RSTROBE_5 | // Read Strobe time of 4 EmifClock
EMIF_ASYNC_RSETUP_1 | // Read Setup time of 1 EmifClock
EMIF_ASYNC_WHOLD_1 | // Write Hold time of 1 EmifClock
EMIF_ASYNC_WSTROBE_2 | // Write Strobe time of 1 EmifClock
EMIF_ASYNC_WSETUP_1 | // Write Setup time of 1 EmifClock
EMIF_ASYNC_EW_DISABLE | // Extended Wait Disable.
EMIF_ASYNC_SS_DISABLE // Strobe Select Mode Disable.
);
DELAY_US(500000);
DM9000_INIT();
DELAY_US(500000);
//********************************************************************
//接受数据测试段代码
//******************************************************************
// for(i=0;i<520;i++){
// databuffer[i] = 0;
// }
//
// while(1){
// PACKE_RECIVE(&databuffer[0] , 520);
//
// if(datalen > 10) ESTOP0;
// }
//*************************************************************************
//发送数据测试段代码
//*************************************************************************
databuffer[0] = 0xFFFF; databuffer[1] = 0xFFFF; databuffer[2] = 0xFFFF;
databuffer[3] = 0x285B; databuffer[4] = 0xC92D; databuffer[5] = 0x587D;
databuffer[6] = 0X00;databuffer[7]=0X00;
for(i = 0 ; i< 512 ; i++){
databuffer[i+8] = i;
}
while(1){
PACKE_SEND(&databuffer[0] , buffersize);
DELAY_US(1000);
}
}
//-------------------------------------------------------------------------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------------------------------------------------------------------------
一下调试过程中的需要注意一下的地方
1、初始化过程中不要搞错寄存器了，在第一次调试的时候，发现对PHY上电到网口的指示灯亮每次的都要2s的时间，这表征着给PHY上电需要2s的时间，后来发现是配置寄存器配置错了。代码中 DM9000_INIT()函数的第一个配置；
2、DM9000只要两个寄存器的直接操作权在我们手里，就是我们可以认为的去读写的两个，一个是0x00；另外一个是0x04；所以在调试的过程中，可以先把寄存器的值写入在读出来，看是否正确；
3、在接收数据调试的时候，由于数据发送端是pc；还会有很多数据通过网口输送出来被DSP检测到，这样就不利于数据的传输；可以将DM9000设置为通用模式，只接受自己设置的目的地址的数据；该设置在DM9000_INIT()函数中的 ：iow(DM_RCR , 0x31);//去掉混杂模试