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
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