嵌入式系統期中報告 -...

嵌入式系統期中報告

ENC28J60

使用SPI的獨立乙太網路控制器

指導老師：陳慶瀚教授

學號：995302031

姓名：曾錦華

目錄

一、ENC28J60 硬體週邊原理介紹 ............................................................................................................. 3

1、原理介紹 .................................................................................................................................................. 3

2、ENC28J60 由七个主要功能模組组成................................................................................................... 3

二、SIOC 的 Driver 設計及主要程式說明 ............................................................................................... 4

1、Main.c ....................................................................................................................................................... 4

2、Spi.c .......................................................................................................................................................... 5

3、WebServer.c .............................................................................................................................................. 6

4、ENC28J60.C ............................................................................................................................................. 7

5、ir_arp_udp_tcp.c ..................................................................................................................................... 11

三、SIOC 與 ENC28J60 的接線圖 ............................................................................................................ 12

四、SIOC 驗證 ................................................................................................................................................. 13

一、ENC28J60 硬體週邊原理介紹

1、原理介紹

A. ENC28J60 是帶有業界標準串列周邊介面（Serial Peripheral Interface，SPI）的獨立乙太網

控制器。它可作為任何配備有 SPI 的控制器的乙太網介面。

B. ENC28J60 符合 IEEE 802.3 的全部規範，採用了一系列包過慮機制以對傳入數據封包進行

限制。它還提供了一个内部 DMA 模組，以實現快速數據吞吐和硬體支持的 IP 驗証和計

算。與主控制器的通信通過兩個中斷引脚和 SPI 實現，數據傳輸速率高達 10 Mb/s。兩個

專用的引脚用於連接 LED，進行網路活動狀態指示。

C. 下圖為 ENC28J60 的架構圖。

2、 ENC28J60 由七个主要功能模組組成：

A. SPI 接口——扮演主控制器和 ENC28J60 之間通信通道。

B. 控制寄存器——用於控制和監視 ENC28J60。

C. 双端口 RAM 緩衝器——用於接收和發送數據包。

D. 判優器——當 DMA、發送和接收模組發出請求時對 RAM 緩衝器的訪問進行控制。

E. 總線接口——對通过 SPI 接收的數據和命令進行解析。

F. MAC （Medium Access Control）模組——實現符合 IEEE 802.3 標準的 MAC 邏輯。

G. PHY（物理層）模組——對雙絞線上的模擬數據進行編碼和解碼。

ENC28J60 架構圖

二、SIOC 的 Driver 設計及主要程式說明

1、 Main.c

int main(void)

{

int rev;

printf("Set_System..... \r\n");

/* System clocks configuration ---------------------------------------------*/

Set_System();

getchar();

printf("RCC_Configuration..... \r\n");

RCC_Configuration();

/* SPI1 configuration */

printf("SPI1& GPIO configuration..... \r\n");

SPI1_Init();

printf("WebServer start..... \r\n\n");

WebServer();

return rev;

}

void RCC_Configuration(void)

{

/* PCLK2 = HCLK/2 */

RCC_PCLK2Config(RCC_HCLK_Div2);

/* Enable peripheral clocks --------------------------------------------------*/

/* GPIOA, GPIOB and SPI1 clock enable */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |

RCC_APB2Periph_SPI1, ENABLE);

/* SPI2 Periph clock enable */

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

}

2、 Spi.c

void SPI1_Init(void)

{

SPI_InitTypeDef SPI_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

/* Configure SPI2 pins: NSS, SCK, MISO and MOSI */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* SPI2 configuration */

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //spi 傳輸模式，全雙工

SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //SPI operating mode

SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //SPI data size 8b or 16b

SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //SPI_CPOL selects the serial clock steady state

SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //the clock active edge for the bit capture

//specifies whether the NSS signal is managed by hardware (NSS pin) or by software using the SSI bit

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

//define the Baud Rate prescaler value which will be used to configure the transmit and receive SCK clock

SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //data transfers start from MSB or LSB bit

SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_Init(SPI2, &SPI_InitStructure);

/* Enable SPI2 */

SPI_Cmd(SPI2, ENABLE);

}

3、 WebServer.c

#include <string.h>

#include "enc28j60.h"

#include "ip_arp_udp_tcp.h"

#include "net.h"

#include "WebServer.h"

#include "stdio.h"

const unsigned char mymac[6] = {0x54,0x55,0x58,0x10,0x00,0x24};

const unsigned char myip[4] = {192,168,2,25};

static unsigned int mywwwport =80;

int WebServer(void)

{

/*initialize enc28j60*/

printf("initialize enc28j60..... \r\n");

enc28j60Init((unsigned char *)mymac);

printf("Execute function init_ip_arp_udp_tcp \r\n");

init_ip_arp_udp_tcp((unsigned char *)mymac,(unsigned char *)myip,mywwwport);

}

4、 ENC28J60.C

#include "enc28j60.h"

#include "spi.h"

#include <stdio.h>

void enc28j60Init(unsigned char* macaddr)

{

// initialize I/O

ENC28J60_CSH();

enc28j60WriteOp(ENC28J60_SOFT_RESET, 0, ENC28J60_SOFT_RESET);

NextPacketPtr = RXSTART_INIT;

// Rx start

enc28j60Write(ERXSTL, RXSTART_INIT&0xFF);

enc28j60Write(ERXSTH, RXSTART_INIT>>8);

// set receive pointer address

enc28j60Write(ERXRDPTL, RXSTART_INIT&0xFF);

enc28j60Write(ERXRDPTH, RXSTART_INIT>>8);

// RX end

enc28j60Write(ERXNDL, RXSTOP_INIT&0xFF);

enc28j60Write(ERXNDH, RXSTOP_INIT>>8);

// TX start

enc28j60Write(ETXSTL, TXSTART_INIT&0xFF);

enc28j60Write(ETXSTH, TXSTART_INIT>>8);

// TX end

enc28j60Write(ETXNDL, TXSTOP_INIT&0xFF);

enc28j60Write(ETXNDH, TXSTOP_INIT>>8);

// do bank 1 stuff, packet filter:

// For broadcast packets we allow only ARP packtets

// All other packets should be unicast only for our mac (MAADR)

//The pattern to match on is therefore

// Type ETH.DST

// ARP BROADCAST

// 06 08 -- ff ff ff ff ff ff -> ip checksum for theses bytes=f7f9

// in binary these poitions are:11 0000 0011 1111

// This is hex 303F->EPMM0=0x3f,EPMM1=0x30

enc28j60Write(ERXFCON, ERXFCON_UCEN|ERXFCON_CRCEN|ERXFCON_PMEN);

enc28j60Write(EPMM0, 0x3f);

enc28j60Write(EPMM1, 0x30);

enc28j60Write(EPMCSL, 0xf9);

enc28j60Write(EPMCSH, 0xf7);

// do bank 2 stuff

// enable MAC receive

enc28j60Write(MACON1, MACON1_MARXEN|MACON1_TXPAUS|MACON1_RXPAUS);

// bring MAC out of reset

enc28j60Write(MACON2, 0x00);

// enable automatic padding to 60bytes and CRC operations

enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, MACON3,

MACON3_PADCFG0|MACON3_TXCRCEN|MACON3_FRMLNEN|MACON3_FULDPX);

// set inter-frame gap (non-back-to-back)

enc28j60Write(MAIPGL, 0x12);

enc28j60Write(MAIPGH, 0x0C);

// set inter-frame gap (back-to-back)

enc28j60Write(MABBIPG, 0x12);

// Set the maximum packet size which the controller will accept

// Do not send packets longer than MAX_FRAMELEN:

enc28j60Write(MAMXFLL, MAX_FRAMELEN&0xFF);

enc28j60Write(MAMXFLH, MAX_FRAMELEN>>8);

// do bank 3 stuff

// write MAC address

// NOTE: MAC address in ENC28J60 is byte-backward

enc28j60Write(MAADR5, macaddr[0]);






printf("MAADR5 = 0x%x\r\n", enc28j60Read(MAADR5));






enc28j60PhyWrite(PHCON1, PHCON1_PDPXMD);

// no loopback of transmitted frames

enc28j60PhyWrite(PHCON2, PHCON2_HDLDIS);

// switch to bank 0

enc28j60SetBank(ECON1);

// enable interrutps

enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, EIE, EIE_INTIE|EIE_PKTIE);

// enable packet reception

enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON1, ECON1_RXEN);

}

void enc28j60WriteOp(unsigned char op, unsigned char address, unsigned char data)

{

unsigned char dat = 0;

ENC28J60_CSL();

// issue write command

dat = op | (address & ADDR_MASK);

SPI1_ReadWrite(dat);

// write data

dat = data;

SPI1_ReadWrite(dat);

ENC28J60_CSH();

}

void enc28j60Write(unsigned char address, unsigned char data)

{

// set the bank

enc28j60SetBank(address);

// do the write

enc28j60WriteOp(ENC28J60_WRITE_CTRL_REG, address, data);

}

void enc28j60PhyWrite(unsigned char address, unsigned int data)

{

// set the PHY register address

enc28j60Write(MIREGADR, address);

// write the PHY data

enc28j60Write(MIWRL, data);

enc28j60Write(MIWRH, data>>8);

// wait until the PHY write completes

while(enc28j60Read(MISTAT) & MISTAT_BUSY)

{

//Del_10us(1);

//_nop_();

}

}

void enc28j60SetBank(unsigned char address)

{

// set the bank (if needed)

if((address & BANK_MASK) != Enc28j60Bank)

{

// set the bank

enc28j60WriteOp(ENC28J60_BIT_FIELD_CLR, ECON1, (ECON1_BSEL1|ECON1_BSEL0));

enc28j60WriteOp(ENC28J60_BIT_FIELD_SET, ECON1, (address & BANK_MASK)>>5);

Enc28j60Bank = (address & BANK_MASK);

}

}

5、 ir_arp_udp_tcp.c

// you must call this function once before you use any of the other functions:

void init_ip_arp_udp_tcp(unsigned char *mymac,unsigned char *myip,unsigned char wwwp)

{

unsigned char i=0;

wwwport=wwwp;

printf("ip address:");

while(i<4)

{

ipaddr[i]=myip[i];

printf("%d.",ipaddr[i]);

i++;

}

printf("\n\n");

i=0;

while(i<6)

{

macaddr[i]=mymac[i];

i++;

}

}

三、SIOC 與 ENC28J60 的接線圖

Mapping Table

Num SIOC ENC28J60

1 GND(1)－白 GND(10)

2 VDD1(4)－黃 VCC 3.3V(9)

3 PB13(22)－橘 SCK(2)

4 PB14(23)－紫 SO(4)

5 PB15(24)－棕 SI(3)

6 PA8(25)－紅 CS(1)

四、SIOC 驗證

1、將 build 好的 dfu 檔寫入 SIOC 後，在 putty 將寫入的 mac address 和 ip address [ 192.168.2.25 ]

秀出

2、手動設定本機的 ip address [ 192.168.2.10 ]，設成 ENC28J60 中的 ip address 同一個網段

3、將網路線連接至 ENC28J60 後，電腦右下會顯示「區域連線現在已連線速度: 10.0 Mbps」

4、確認本機的 ip address [ 192.168.2.10 ]

5、使用 ping 指令來確認 ENC28J60(ip : 192.168.2.25)是否有回有應，結果有回應，測試成功

─作業最晚於 5 月 26 日前繳交電子檔，含 Word 檔和 project file，e-mail 寄至：

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