SMARTARM2200 ADS工程在IAR EWARM 5.3上的移植(7)-LwIP 1.2的移植(RTL8019AS驱动1)

实现LwIP与uCOSII的操作系统模拟层后,剩下重要的一部分就是网卡驱动了.SMARTARM2200用的网卡芯片是RTL8019AS.
RTL8019AS.有3种工作方式：
第一种为跳线方式，网卡的i/o和中断由跳线决定
第二种为即插即用方式，由软件进行自动配置plug and play
第三种为免跳线方式，网卡的i/o和中断由外接的93c46里的内容决定。

SMARTARM2200使用第一种方式即跳线方式.65脚JP为高电平时即为跳线模式.其基地址为300H,中断源为INT0(P0.9),操作地址为0x83400000~0x0x83400001F,该地址为CS3,A23,A22,A21通过ATF16LV8C译码而得.
更详细的信息可以参考我上传的工程http://download.csdn.net/source/1661278

由于很多涉及操作RTL8019AS寄存器,关于这方面更详细的内容请参考RTL8019AS的DataSheet.
RTL8019AS的驱动实现在2个文件里:
RTL8019.c:实现一些操作RTL8019AS的基本函数
ethernetif.c:实现LwIP与网卡接收发送的接口函数,主要是low_level_input和low_level_output以及中断处理函数
先讲RTL8019.c实现的一些函数:

1.定义读写寄存器的宏
//因为LPC2220的SAO～SA4与LPC2220的ADDRl～ADDR5相连,RTL8019AS工作在16位模式#define RTL8019Addr (0x83400000>>1)#define Write8019Reg(addr, dat) *((volatile unsigned char *)((RTL8019Addr+addr)<<1)) = dat#define Read8019Reg(addr) *((volatile unsigned char *)((RTL8019Addr+addr)<<1))
2.页选择,RTL8019AS有4页寄存器,前3页与NE2000兼容,最后一页是自己的定义的,用来PNP,我们用不到,不用去设置
void page(unsigned char pagenumber){unsigned char temp;temp = Read8019Reg(0x00) & 0x3B; //CR(00H)第6,7位PS1,PS0进行页选择temp |= (pagenumber <<6);Write8019Reg(0x00, temp);}
3.GPIO初始化
void RTL8019AS_GPIOInit(void){ PINSEL0 |= 3<<18; //设置中断管脚连接，P0.9设置为EINT3OSTimeDly(10);IO0DIR |= NET_RST;//set reset pin direction to output}
4.中断初始化
void RTL8019AS_InterruptInit(void){ //设置触发方式,上升沿触发 EXTMODE |= 0x08; EXTPOLAR |= 0x08; //EINT3清除中断状态 EXTINT = 1<<3; //配置LPC2220中断向量,并使能 VICIntSelect &= ~(1 << VIC_EINT3); /* Configure the Ethernet VIC interrupt source for IRQ */ VICVectCntl14 = 0x20 | VIC_EINT3; VICVectAddr14 = (CPU_INT32U)IRQ_Eint3; /* Set the vector address */ VICIntEnable = (1 << VIC_EINT3); /* Enable the VIC interrupt source, but no local sources */}
5.复位网卡
static void RTL8019AS_Reset() //复位网卡{IO0SET |= NET_RST;OSTimeDly(10);IO0CLR |= NET_RST; OSTimeDly(10);}
6.写MAC地址
static void RTL8019AS_WriteMAC(void){page(1);Write8019Reg(0x01, My_hwaddr[0]);Write8019Reg(0x02, My_hwaddr[1]);Write8019Reg(0x03, My_hwaddr[2]);Write8019Reg(0x04, My_hwaddr[3]);Write8019Reg(0x05, My_hwaddr[4]);Write8019Reg(0x06, My_hwaddr[5]);page(0);}
7.准备好以上几个基本函数后,就可以进行RTL8019AS的初始化了
void RTL8019AS_Init(void){unsigned char i; RTL8019AS_GPIOInit(); while(1){ //复位8019RTL8019AS_Reset();OSTimeDly(10); //使芯片处于停止模式,这时进行寄存器设置 停止模式下,将不会发送和接收数据包Write8019Reg(0x00, 0x21); //延时10毫秒,确保芯片进入停止模式OSTimeDly(10);i = Read8019Reg(0x00); //复位后,CR bit0(STP)应为1,芯片处于停止模式if(i == 0x21)break;}page(0);Write8019Reg(0x0a, 0x00);//RBCR0Write8019Reg(0x0b, 0x00);//RBCR1Write8019Reg(0x0c, 0xe0);//RCR monitor mode (no packet receive)Write8019Reg(0x0d, 0xe2);//loop back mode 使芯片处于mon和loopback模式,跟外部网络断开Write8019Reg(0x01, 0x4c);//PSTART 设置起始页Write8019Reg(0x02, 0x80);//PSTOP 设置停止页Write8019Reg(0x03, 0x4c);//BNRY 设置读缓冲指针Write8019Reg(0x04, 0x40);//TPSR 设置发送包起始页Write8019Reg(0x07, 0xff);//ISR 清除所有中断标志位Write8019Reg(0x0f, 0x11);//IMR 禁止OVW PRX中断Write8019Reg(0x0e, 0xc8);//DCR 8位dma方式page(1);Write8019Reg(0x07, 0x4d);//CURR 设置接收包起始页Write8019Reg(0x08, 0x00);//MAR0-7 多播地址(未使用设置为0)Write8019Reg(0x09, 0x00);Write8019Reg(0x0a, 0x00);Write8019Reg(0x0b, 0x00);Write8019Reg(0x0c, 0x00);Write8019Reg(0x0d, 0x00);Write8019Reg(0x0e, 0x00);Write8019Reg(0x0f, 0x00);Write8019Reg(0x00, 0x22);//CR 这时让芯片开始工作 RTL8019AS_WriteMAC();//将网卡MAC地址写入到mar寄存器 page(0);Write8019Reg(0x0c, 0xcc);//RCR 设置接收模式Write8019Reg(0x0d, 0xe0);//TCR 将网卡设置成正常模式Write8019Reg(0x00, 0x22);//CR 这时让芯片开始工作Write8019Reg(0x07, 0xff);//ISR 清除所有中断标志位}
8.发送数据包send_frame,该函数在ethernetif.c中的low_level_output被调用
void send_frame(unsigned char * outbuf, unsigned short len){unsigned char i;unsigned short j;unsigned char temp;page(0);if(len<60)len=60;//长度最小为60字节txd_buffer_select=!txd_buffer_select;//交换输出缓冲区 if(txd_buffer_select)Write8019Reg(0x09, 0x40);//txdwrite highaddress将远程DMA地址分为两个，40-45，46-4b。前面用于发送包。elseWrite8019Reg(0x09, 0x46);//txdwrite highaddress后面用于构造端的包Write8019Reg(0x08, 0x00);//RSAR 设置远程DMA起始地址//read page address lowWrite8019Reg(0x0b, (unsigned char)(len>>8));//read count highWrite8019Reg(0x0a, (unsigned char)(len&0xff));//read count lowWrite8019Reg(0x00, 0x12);//write dma, page0从远端DMA写到8019RAM中数据for(j=0; j<len; j++){Write8019Reg(0x10, *(outbuf+j));}for(i=0;i<16;i++)//最多重发16次{for(j=0;j<1000;j++)//检查txp为是否为低{temp = Read8019Reg(0x00);if((temp&0x04)==0) break;}temp = Read8019Reg(0x04);if((temp&0x01)!=0) break;//表示发送成功，如果不成功，则执行reg00=3e，继续发送。Write8019Reg(0x00, 0x3e);}Write8019Reg(0x07, 0xff);//清除所有中断标志位if(txd_buffer_select)Write8019Reg(0x04, 0x40);//txd packet start; //设置发送开始页的地址else Write8019Reg(0x04, 0x46);//txd packet start;Write8019Reg(0x06, (unsigned char)(len>>8));//high byte counter要发送的包的字节数（长度）Write8019Reg(0x05, (unsigned char)(len&0xff));//low byte counterWrite8019Reg(0x07, 0xff);//清除所有中断Write8019Reg(0x00, 0x3e);//to sendpacket; 从本地DMA中发送包}
9.RTL8019AS_Query,查询是否有新数据包接收,这个函数在接收中断处理函数中被调用
char RTL8019AS_Query(void){ unsigned char my_bnry=0;unsigned char my_curr=0;page(0);my_bnry = Read8019Reg(0x03);//bnry page have read 读页指针page(1);my_curr = Read8019Reg(0x07);//curr writepoint 8019写页指针page(0);if ((my_curr==0))return 0;my_bnry++;if (my_bnry>0x7f)my_bnry=0x4c;if (my_bnry!=my_curr)//此时表示有新的数据包在缓冲区里{ //complete dma page 0 //Remote DMA WriteWrite8019Reg(0x0b, 0x00);Write8019Reg(0x0a, 0x00);Write8019Reg(0x00, 0x22);return 1;}Write8019Reg(0x0b, 0x00);Write8019Reg(0x0a, 0x00);Write8019Reg(0x00, 0x22);return 0;}

下一篇介绍ethernetif.c中low_level_input,low_level_output及中断处理的实现