/****************************************************************** *****                                                        ***** *****  Name: cs8900.c                                        ***** *****  Ver.: 1.0                                             ***** *****  Date: 07/05/2001                                      ***** *****  Auth: Andreas Dannenberg                              ***** *****        HTWK Leipzig                                    ***** *****        university of applied sciences                  ***** *****        Germany                                         ***** *****        adannenb@et.htwk-leipzig.de                     ***** *****  Func: ethernet packet-driver for use with LAN-        ***** *****        controller CS8900 from Crystal/Cirrus Logic     ***** *****                                                        ***** ******************************************************************/#include "cs8900.h"// configure port-pins for use with LAN-controller,// reset it and send the configuration-sequence// (InitSeq[])void Init8900(void){  unsigned int i;  P3SEL = 0x30;                                  // reserve P3.4 and P3.5 for rs232  P3OUT = IOR | IOW;                             // reset outputs, control lines high  P3DIR = 0xFF;                                  // port 3 as output (all pins but rs232)  P5SEL = 0;                                     // select standard port functions  P5OUT = 0;                                     // reset outputs  P5DIR = 0xFF;                                  // switch data port to output  Write8900(ADD_PORT, PP_SelfCTL);  Write8900(DATA_PORT, POWER_ON_RESET);          // Reset the Ethernet-Controller  Write8900(ADD_PORT, PP_SelfST);  while (!(Read8900(DATA_PORT) & INIT_DONE));    // wait until chip-reset is done    for (i = 0; i < sizeof InitSeq / sizeof (TInitSeq); i++) // configure the CS8900  {    Write8900(ADD_PORT, InitSeq[i].Addr);    Write8900(DATA_PORT, InitSeq[i].Data);  }}// writes a word in little-endian byte order to// a specified port-addressvoid Write8900(unsigned char Address, unsigned int Data){  P5DIR = 0xFF;                                  // data port to output  P3OUT = IOR | IOW | Address;                   // put address on bus    P5OUT = Data;                                  // write low order byte to data bus  P3OUT &= ~IOW;                                 // toggle IOW-signal  P3OUT = IOR | IOW | (Address + 1);             // and put next address on bus  P5OUT = Data >> 8;                             // write high order byte to data bus  P3OUT &= ~IOW;                                 // toggle IOW-signal  P3OUT |= IOW;}// writes a word in little-endian byte order to TX_FRAME_PORTvoid WriteFrame8900(unsigned int Data){  P5DIR = 0xFF;                                  // data port to output  P3OUT = IOR | IOW | TX_FRAME_PORT;             // put address on bus    P5OUT = Data;                                  // write low order byte to data bus  P3OUT &= ~IOW;                                 // toggle IOW-signal  P3OUT = IOR | IOW | (TX_FRAME_PORT + 1);       // and put next address on bus  P5OUT = Data >> 8;                             // write high order byte to data bus  P3OUT &= ~IOW;                                 // toggle IOW-signal  P3OUT |= IOW;}// copies bytes from MCU-memory to frame port// NOTES: * an odd number of byte may only be transfered//          if the frame is written to the end!//        * MCU-memory MUST start at word-boundaryvoid CopyToFrame8900(void *Source, unsigned int Size){  P5DIR = 0xFF;                                  // data port to output    while (Size > 1) {    WriteFrame8900(*((unsigned int *)Source)++);    Size -= 2;  }    if (Size)                                      // if odd num. of bytes...    WriteFrame8900(*(unsigned char *)Source);    // write leftover byte (the LAN-controller}                                                // ignores the highbyte)// reads a word in little-endian byte order from// a specified port-addressunsigned int Read8900(unsigned char Address){  unsigned int ReturnValue;  P5DIR = 0x00;                                  // data port to input  P3OUT = IOR | IOW | Address;                   // put address on bus  P3OUT &= ~IOR;                                 // IOR-signal low    ReturnValue = P5IN;                            // get low order byte from data bus  P3OUT = IOR | IOW | (Address + 1);             // IOR high and put next address on bus  P3OUT &= ~IOR;                                 // IOR-signal low  ReturnValue |= P5IN << 8;                      // get high order byte from data bus    P3OUT |= IOR;    return ReturnValue;}// reads a word in little-endian byte order from RX_FRAME_PORTunsigned int ReadFrame8900(void){  unsigned int ReturnValue;  P5DIR = 0x00;                                  // data port to input  P3OUT = IOR | IOW | RX_FRAME_PORT;             // access to RX_FRAME_PORT  P3OUT &= ~IOR;                                 // IOR-signal low    ReturnValue = P5IN;                            // get 1st byte from data bus (low-byte)  P3OUT = IOR | IOW | (RX_FRAME_PORT + 1);       // IOR high and put next address on bus  P3OUT &= ~IOR;                                 // IOR-signal low  ReturnValue |= P5IN << 8;                      // get 2nd byte from data bus (high-byte)    P3OUT |= IOR;    return ReturnValue;}// reads a word in big-endian byte order from RX_FRAME_PORT// (useful to avoid permanent byte-swapping while reading// TCP/IP-data)unsigned int ReadFrameBE8900(void){  unsigned int ReturnValue;  P5DIR = 0x00;                                  // data port to input  P3OUT = IOR | IOW | RX_FRAME_PORT;             // access to RX_FRAME_PORT  P3OUT &= ~IOR;                                 // IOR-signal low    ReturnValue = P5IN << 8;                       // get 1st byte from data bus (high-byte)  P3OUT = IOR | IOW | (RX_FRAME_PORT + 1);       // IOR high and put next address on bus  P3OUT &= ~IOR;                                 // IOR-signal low  ReturnValue |= P5IN;                           // get 2nd byte from data bus (low-byte)    P3OUT |= IOR;    return ReturnValue;}// reads a word in little-endian byte order from// a specified port-address// NOTE: this func. xfers the high-byte 1st, must be used to//       access some special registers (e.g. RxStatus)unsigned int ReadHB1ST8900(unsigned char Address){  unsigned int ReturnValue;  P5DIR = 0x00;                                  // data port to input  P3OUT = IOR | IOW | (Address + 1);             // put address on bus  P3OUT &= ~IOR;                                 // IOR-signal low    ReturnValue = P5IN << 8;                       // get high order byte from data bus  P3OUT = IOR | IOW | Address;                   // IOR high and put next address on bus  P3OUT &= ~IOR;                                 // IOR-signal low  ReturnValue |= P5IN;                           // get low order byte from data bus    P3OUT |= IOR;    return ReturnValue;}// copies bytes from frame port to MCU-memory// NOTES: * an odd number of byte may only be transfered//          if the frame is read to the end!//        * MCU-memory MUST start at word-boundaryvoid CopyFromFrame8900(void *Dest, unsigned int Size){  while (Size > 1) {    *((unsigned int *)Dest)++ = ReadFrame8900();    Size -= 2;  }    if (Size)                                      // check for leftover byte...    *(unsigned char *)Dest = ReadFrame8900();    // the LAN-Controller will return 0}                                                // for the highbyte// does a dummy read on frame-I/O-port// NOTE: only an even number of bytes is read!void DummyReadFrame8900(unsigned int Size)       // discards an EVEN number of bytes{                                                // from RX-fifo  while (Size > 1) {    ReadFrame8900();    Size -= 2;  }}// requests space in CS8900's on-chip memory for// storing an outgoing framevoid RequestSend(unsigned int FrameSize){  Write8900(TX_CMD_PORT, TX_START_ALL_BYTES);  Write8900(TX_LEN_PORT, FrameSize);}// check if CS8900 is ready to accept the// frame we want to sendunsigned int Rdy4Tx(void){  Write8900(ADD_PORT, PP_BusST);  return (Read8900(DATA_PORT) & READY_FOR_TX_NOW);}