emac.c revision 161196
1/******************************************************************************* 2 * 3 * Filename: emac.c 4 * 5 * Instantiation of routines for MAC/ethernet functions supporting tftp. 6 * 7 * Revision information: 8 * 9 * 28AUG2004 kb_admin initial creation 10 * 08JAN2005 kb_admin added tftp download 11 * also adapted from external sources 12 * 13 * BEGIN_KBDD_BLOCK 14 * No warranty, expressed or implied, is included with this software. It is 15 * provided "AS IS" and no warranty of any kind including statutory or aspects 16 * relating to merchantability or fitness for any purpose is provided. All 17 * intellectual property rights of others is maintained with the respective 18 * owners. This software is not copyrighted and is intended for reference 19 * only. 20 * END_BLOCK 21 * 22 * $FreeBSD: head/sys/boot/arm/at91/libat91/emac.c 161196 2006-08-10 18:11:22Z imp $ 23 ******************************************************************************/ 24 25#include "at91rm9200.h" 26#include "at91rm9200_lowlevel.h" 27#include "emac.h" 28#include "lib.h" 29 30/* ****************************** GLOBALS *************************************/ 31 32/* ********************** PRIVATE FUNCTIONS/DATA ******************************/ 33 34static unsigned localMACSet, serverMACSet; 35static unsigned char localMACAddr[6], serverMACAddr[6]; 36static unsigned localMAClow, localMAChigh; 37static unsigned localIPSet, serverIPSet; 38static unsigned char localIPAddr[4], serverIPAddr[4]; 39static unsigned short serverPort, localPort; 40static int ackBlock; 41static unsigned lastSize; 42static char *dlAddress; 43 44static unsigned transmitBuffer[1024 / sizeof(unsigned)]; 45static unsigned tftpSendPacket[256 / sizeof(unsigned)]; 46 47receive_descriptor_t *p_rxBD; 48 49 50/* 51 * .KB_C_FN_DEFINITION_START 52 * unsigned short IP_checksum(unsigned short *p, int len) 53 * This private function calculates the IP checksum for various headers. 54 * .KB_C_FN_DEFINITION_END 55 */ 56static unsigned short 57IP_checksum(unsigned short *p, int len) 58{ 59 unsigned i, t; 60 61 len &= ~1; 62 63 for (i=0,t=0; i<len; i+=2, ++p) 64 t += SWAP16(*p); 65 66 t = (t & 0xffff) + (t >> 16); 67 return (~t); 68} 69 70 71/* 72 * .KB_C_FN_DEFINITION_START 73 * void GetServerAddress(void) 74 * This private function sends an ARP request to determine the server MAC. 75 * .KB_C_FN_DEFINITION_END 76 */ 77static void 78GetServerAddress(void) 79{ 80 arp_header_t *p_ARP; 81 82 p_ARP = (arp_header_t*)transmitBuffer; 83 84 p_memset((char*)p_ARP->dest_mac, 0xFF, 6); 85 86 p_memcpy((char*)p_ARP->src_mac, (char*)localMACAddr, 6); 87 88 p_ARP->frame_type = SWAP16(PROTOCOL_ARP); 89 p_ARP->hard_type = SWAP16(1); 90 p_ARP->prot_type = SWAP16(PROTOCOL_IP); 91 p_ARP->hard_size = 6; 92 p_ARP->prot_size = 4; 93 p_ARP->operation = SWAP16(ARP_REQUEST); 94 95 p_memcpy((char*)p_ARP->sender_mac, (char*)localMACAddr, 6); 96 97 p_memcpy((char*)p_ARP->sender_ip, (char*)localIPAddr, 4); 98 99 p_memset((char*)p_ARP->target_mac, 0, 6); 100 101 p_memcpy((char*)p_ARP->target_ip, (char*)serverIPAddr, 4); 102 103 // wait until transmit is available 104 while (!(*AT91C_EMAC_TSR & AT91C_EMAC_BNQ)) ; 105 106 *AT91C_EMAC_TSR |= AT91C_EMAC_COMP; 107 *AT91C_EMAC_TAR = (unsigned)transmitBuffer; 108 *AT91C_EMAC_TCR = 0x40; 109} 110 111 112/* 113 * .KB_C_FN_DEFINITION_START 114 * void Send_TFTP_Packet(char *tftpData, unsigned tftpLength) 115 * This private function initializes and send a TFTP packet. 116 * .KB_C_FN_DEFINITION_END 117 */ 118static void 119Send_TFTP_Packet(char *tftpData, unsigned tftpLength) 120{ 121 transmit_header_t *macHdr = (transmit_header_t*)tftpSendPacket; 122 ip_header_t *ipHdr; 123 udp_header_t *udpHdr; 124 unsigned t_checksum; 125 126 p_memcpy((char*)macHdr->dest_mac, (char*)serverMACAddr, 6); 127 128 p_memcpy((char*)macHdr->src_mac, (char*)localMACAddr, 6); 129 130 macHdr->proto_mac = SWAP16(PROTOCOL_IP); 131 132 ipHdr = (ip_header_t*)&macHdr->packet_length; 133 134 ipHdr->ip_v_hl = 0x45; 135 ipHdr->ip_tos = 0; 136 ipHdr->ip_len = SWAP16(28 + tftpLength); 137 ipHdr->ip_id = 0; 138 ipHdr->ip_off = SWAP16(0x4000); 139 ipHdr->ip_ttl = 64; 140 ipHdr->ip_p = PROTOCOL_UDP; 141 ipHdr->ip_sum = 0; 142 143 p_memcpy((char*)ipHdr->ip_src, (char*)localIPAddr, 4); 144 145 p_memcpy((char*)ipHdr->ip_dst, (char*)serverIPAddr, 4); 146 147 ipHdr->ip_sum = SWAP16(IP_checksum((unsigned short*)ipHdr, 20)); 148 149 udpHdr = (udp_header_t*)(ipHdr + 1); 150 151 udpHdr->src_port = localPort; 152 udpHdr->dst_port = serverPort; 153 udpHdr->udp_len = SWAP16(8 + tftpLength); 154 udpHdr->udp_cksum = 0; 155 156 p_memcpy((char*)udpHdr+8, tftpData, tftpLength); 157 158 t_checksum = IP_checksum((unsigned short*)ipHdr + 6, (16 + tftpLength)); 159 160 t_checksum = (~t_checksum) & 0xFFFF; 161 t_checksum += 25 + tftpLength; 162 163 t_checksum = (t_checksum & 0xffff) + (t_checksum >> 16); 164 t_checksum = (~t_checksum) & 0xFFFF; 165 166 udpHdr->udp_cksum = SWAP16(t_checksum); 167 168 while (!(*AT91C_EMAC_TSR & AT91C_EMAC_BNQ)) ; 169 170 *AT91C_EMAC_TSR |= AT91C_EMAC_COMP; 171 *AT91C_EMAC_TAR = (unsigned)tftpSendPacket; 172 *AT91C_EMAC_TCR = 42 + tftpLength; 173} 174 175 176/* 177 * .KB_C_FN_DEFINITION_START 178 * void TFTP_RequestFile(char *filename) 179 * This private function sends a RRQ packet to the server. 180 * .KB_C_FN_DEFINITION_END 181 */ 182static void 183TFTP_RequestFile(char *filename) 184{ 185 tftp_header_t tftpHeader; 186 char *cPtr, *ePtr, *mPtr; 187 unsigned length; 188 189 tftpHeader.opcode = TFTP_RRQ_OPCODE; 190 191 cPtr = (char*)&(tftpHeader.block_num); 192 193 ePtr = p_strcpy(cPtr, filename); 194 mPtr = p_strcpy(ePtr, "octet"); 195 196 length = mPtr - cPtr; 197 length += 2; 198 199 Send_TFTP_Packet((char*)&tftpHeader, length); 200} 201 202 203/* 204 * .KB_C_FN_DEFINITION_START 205 * void TFTP_ACK_Data(char *data, unsigned short block_num, unsigned short len) 206 * This private function sends an ACK packet to the server. 207 * .KB_C_FN_DEFINITION_END 208 */ 209static void 210TFTP_ACK_Data(char *data, unsigned short block_num, unsigned short len) 211{ 212 tftp_header_t tftpHeader; 213 214 if (block_num == (ackBlock + 1)) { 215 ++ackBlock; 216 p_memcpy(dlAddress, data, len); 217 dlAddress += len; 218 lastSize += len; 219 if (ackBlock % 128 == 0) 220 printf("tftp: %u kB\r", lastSize / 1024); 221 } 222 tftpHeader.opcode = TFTP_ACK_OPCODE; 223 tftpHeader.block_num = SWAP16(ackBlock); 224 Send_TFTP_Packet((char*)&tftpHeader, 4); 225 if (len < 512) { 226 ackBlock = -2; 227 printf("tftp: %u byte\r\n", lastSize); 228 } 229} 230 231 232/* 233 * .KB_C_FN_DEFINITION_START 234 * void CheckForNewPacket(ip_header_t *pHeader) 235 * This private function polls for received ethernet packets and handles 236 * any here. 237 * .KB_C_FN_DEFINITION_END 238 */ 239static int 240CheckForNewPacket(ip_header_t *pHeader) 241{ 242 unsigned short *pFrameType; 243 unsigned i; 244 char *pData; 245 ip_header_t *pIpHeader; 246 arp_header_t *p_ARP; 247 int process = 0; 248 249 process = 0; 250 for (i = 0; i < MAX_RX_PACKETS; ++i) { 251 if(p_rxBD[i].address & 0x1) { 252 process = 1; 253 (*AT91C_EMAC_RSR) |= (*AT91C_EMAC_RSR); 254 break; 255 } 256 } 257 258 if (!process) 259 return (0); 260 261 process = i; 262 263 pFrameType = (unsigned short *)((p_rxBD[i].address & 0xFFFFFFFC) + 12); 264 pData = (char *)(p_rxBD[i].address & 0xFFFFFFFC); 265 266 switch (*pFrameType) { 267 268 case SWAP16(PROTOCOL_ARP): 269 p_ARP = (arp_header_t*)pData; 270 if (p_ARP->operation == SWAP16(ARP_REPLY)) { 271 // check if new server info is available 272 if ((!serverMACSet) && 273 (!(p_memcmp((char*)p_ARP->sender_ip, 274 (char*)serverIPAddr, 4)))) { 275 276 serverMACSet = 1; 277 278 p_memcpy((char*)serverMACAddr, 279 (char*)p_ARP->sender_mac, 6); 280 } 281 } else if (p_ARP->operation == SWAP16(ARP_REQUEST)) { 282 // ARP REPLY operation 283 p_ARP->operation = SWAP16(ARP_REPLY); 284 285 // Fill the dest address and src address 286 for (i = 0; i <6; i++) { 287 // swap ethernet dest address and ethernet src address 288 pData[i] = pData[i+6]; 289 pData[i+6] = localMACAddr[i]; 290 // swap sender ethernet address and target ethernet address 291 pData[i+22] = localMACAddr[i]; 292 pData[i+32] = pData[i+6]; 293 } 294 295 // swap sender IP address and target IP address 296 for (i = 0; i<4; i++) { 297 pData[i+38] = pData[i+28]; 298 pData[i+28] = localIPAddr[i]; 299 } 300 301 if (!(*AT91C_EMAC_TSR & AT91C_EMAC_BNQ)) break; 302 303 *AT91C_EMAC_TSR |= AT91C_EMAC_COMP; 304 *AT91C_EMAC_TAR = (unsigned)pData; 305 *AT91C_EMAC_TCR = 0x40; 306 } 307 break; 308 case SWAP16(PROTOCOL_IP): 309 pIpHeader = (ip_header_t*)(pData + 14); 310 p_memcpy((char*)pHeader, (char*)pIpHeader,sizeof(ip_header_t)); 311 312 if (pIpHeader->ip_p == PROTOCOL_UDP) { 313 udp_header_t *udpHdr; 314 tftp_header_t *tftpHdr; 315 316 udpHdr = (udp_header_t*)((char*)pIpHeader+20); 317 tftpHdr = (tftp_header_t*)((char*)udpHdr + 8); 318 319 if (udpHdr->dst_port != localPort) 320 break; 321 322 if (tftpHdr->opcode != TFTP_DATA_OPCODE) 323 break; 324 325 if (ackBlock == -1) { 326 if (tftpHdr->block_num != SWAP16(1)) 327 break; 328 serverPort = udpHdr->src_port; 329 ackBlock = 0; 330 } 331 332 if (serverPort != udpHdr->src_port) 333 break; 334 335 TFTP_ACK_Data(tftpHdr->data, 336 SWAP16(tftpHdr->block_num), 337 SWAP16(udpHdr->udp_len) - 12); 338 } 339 } 340 p_rxBD[process].address &= ~0x01; 341 return (1); 342} 343 344 345/* 346 * .KB_C_FN_DEFINITION_START 347 * unsigned short AT91F_MII_ReadPhy (AT91PS_EMAC pEmac, unsigned char addr) 348 * This private function reads the PHY device. 349 * .KB_C_FN_DEFINITION_END 350 */ 351static unsigned short 352AT91F_MII_ReadPhy (AT91PS_EMAC pEmac, unsigned char addr) 353{ 354 unsigned value = 0x60020000 | (addr << 18); 355 356 pEmac->EMAC_CTL |= AT91C_EMAC_MPE; 357 pEmac->EMAC_MAN = value; 358 while(!((pEmac->EMAC_SR) & AT91C_EMAC_IDLE)); 359 pEmac->EMAC_CTL &= ~AT91C_EMAC_MPE; 360 return (pEmac->EMAC_MAN & 0x0000ffff); 361} 362 363/* 364 * .KB_C_FN_DEFINITION_START 365 * unsigned short AT91F_MII_ReadPhy (AT91PS_EMAC pEmac, unsigned char addr) 366 * This private function reads the PHY device. 367 * .KB_C_FN_DEFINITION_END 368 */ 369#ifdef BOOT_TSC 370static unsigned short 371AT91F_MII_WritePhy (AT91PS_EMAC pEmac, unsigned char addr, unsigned short s) 372{ 373 unsigned value = 0x50020000 | (addr << 18) | s; 374 375 pEmac->EMAC_CTL |= AT91C_EMAC_MPE; 376 pEmac->EMAC_MAN = value; 377 while(!((pEmac->EMAC_SR) & AT91C_EMAC_IDLE)); 378 pEmac->EMAC_CTL &= ~AT91C_EMAC_MPE; 379 return (pEmac->EMAC_MAN & 0x0000ffff); 380} 381#endif 382 383/* 384 * .KB_C_FN_DEFINITION_START 385 * void MII_GetLinkSpeed(AT91PS_EMAC pEmac) 386 * This private function determines the link speed set by the PHY. 387 * .KB_C_FN_DEFINITION_END 388 */ 389static void 390MII_GetLinkSpeed(AT91PS_EMAC pEmac) 391{ 392 unsigned short stat2; 393 unsigned update; 394#ifdef BOOT_TSC 395 unsigned sec; 396 int i; 397#endif 398#ifdef BOOT_KB9202 399 stat2 = AT91F_MII_ReadPhy(pEmac, MII_STS2_REG); 400 if (!(stat2 & MII_STS2_LINK)) 401 return ; 402 update = pEmac->EMAC_CFG & ~(AT91C_EMAC_SPD | AT91C_EMAC_FD); 403 if (stat2 & MII_STS2_100TX) 404 update |= AT91C_EMAC_SPD; 405 if (stat2 & MII_STS2_FDX) 406 update |= AT91C_EMAC_FD; 407#endif 408#ifdef BOOT_TSC 409 while (1) { 410 for (i = 0; i < 10; i++) { 411 stat2 = AT91F_MII_ReadPhy(pEmac, MII_STS_REG); 412 if (stat2 & MII_STS_LINK_STAT) 413 break; 414 printf("."); 415 sec = GetSeconds(); 416 while (GetSeconds() <= sec) continue; 417 } 418 if (stat2 & MII_STS_LINK_STAT) 419 break; 420 printf("Resetting MII..."); 421 AT91F_MII_WritePhy(pEmac, 0x0, 0x8000); 422 while (AT91F_MII_ReadPhy(pEmac, 0x0) & 0x8000) continue; 423 } 424 printf("emac: link"); 425 stat2 = AT91F_MII_ReadPhy(pEmac, MII_SPEC_STS_REG); 426 update = pEmac->EMAC_CFG & ~(AT91C_EMAC_SPD | AT91C_EMAC_FD); 427 if (stat2 & (MII_SSTS_100FDX | MII_SSTS_100HDX)) { 428 printf(" 100TX"); 429 update |= AT91C_EMAC_SPD; 430 } 431 if (stat2 & (MII_SSTS_100FDX | MII_SSTS_10FDX)) { 432 printf(" FDX"); 433 update |= AT91C_EMAC_FD; 434 } 435 printf("\r\n"); 436#endif 437 pEmac->EMAC_CFG = update; 438} 439 440 441/* 442 * .KB_C_FN_DEFINITION_START 443 * void AT91F_EmacEntry(void) 444 * This private function initializes the EMAC on the chip. 445 * .KB_C_FN_DEFINITION_END 446 */ 447static void 448AT91F_EmacEntry(void) 449{ 450 unsigned i; 451 char *pRxPacket = (char*)RX_DATA_START; 452 AT91PS_EMAC pEmac = AT91C_BASE_EMAC; 453 454 for (i = 0; i < MAX_RX_PACKETS; ++i) { 455 456 p_rxBD[i].address = (unsigned)pRxPacket; 457 p_rxBD[i].size = 0; 458 pRxPacket += RX_PACKET_SIZE; 459 } 460 461 // Set the WRAP bit at the end of the list descriptor 462 p_rxBD[MAX_RX_PACKETS-1].address |= 0x02; 463 464 if (!(pEmac->EMAC_SR & AT91C_EMAC_LINK)) 465 MII_GetLinkSpeed(pEmac); 466 467 pEmac->EMAC_RBQP = (unsigned) p_rxBD; 468 pEmac->EMAC_RSR |= (AT91C_EMAC_OVR | AT91C_EMAC_REC | AT91C_EMAC_BNA); 469 pEmac->EMAC_CTL = AT91C_EMAC_TE | AT91C_EMAC_RE; 470 471 pEmac->EMAC_TAR = (unsigned)transmitBuffer; 472} 473 474 475/* ************************** GLOBAL FUNCTIONS ********************************/ 476 477 478/* 479 * .KB_C_FN_DEFINITION_START 480 * void SetMACAddress(unsigned low_address, unsigned high_address) 481 * This global function sets the MAC address. low_address is the first 482 * four bytes while high_address is the last 2 bytes of the 48-bit value. 483 * .KB_C_FN_DEFINITION_END 484 */ 485void 486SetMACAddress(unsigned char mac[6]) 487{ 488 AT91PS_PMC pPMC = AT91C_BASE_PMC; 489 AT91PS_EMAC pEmac = AT91C_BASE_EMAC; 490 491 /* enable the peripheral clock before using EMAC */ 492 pPMC->PMC_PCER = ((unsigned) 1 << AT91C_ID_EMAC); 493 494 p_memcpy(localMACAddr, mac, 6); 495 localMAClow = (mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]; 496 localMAChigh = (mac[0] << 8) | mac[1]; 497 localMACSet = 1; 498 499 AT91C_BASE_PMC->PMC_PCER = 1u << AT91C_ID_EMAC; 500 AT91C_BASE_PIOA->PIO_ASR = 501 AT91C_PA14_ERXER | AT91C_PA12_ERX0 | AT91C_PA13_ERX1 | 502 AT91C_PA8_ETXEN | AT91C_PA16_EMDIO | AT91C_PA9_ETX0 | 503 AT91C_PA10_ETX1 | AT91C_PA11_ECRS_ECRSDV | AT91C_PA15_EMDC | 504 AT91C_PA7_ETXCK_EREFCK; 505 AT91C_BASE_PIOA->PIO_PDR = 506 AT91C_PA14_ERXER | AT91C_PA12_ERX0 | AT91C_PA13_ERX1 | 507 AT91C_PA8_ETXEN | AT91C_PA16_EMDIO | AT91C_PA9_ETX0 | 508 AT91C_PA10_ETX1 | AT91C_PA11_ECRS_ECRSDV | AT91C_PA15_EMDC | 509 AT91C_PA7_ETXCK_EREFCK; 510#ifdef BOOT_KB9202 /* Really !RMII */ 511 AT91C_BASE_PIOB->PIO_BSR = 512 AT91C_PB12_ETX2 | AT91C_PB13_ETX3 | AT91C_PB14_ETXER | 513 AT91C_PB15_ERX2 | AT91C_PB16_ERX3 | AT91C_PB17_ERXDV | 514 AT91C_PB18_ECOL | AT91C_PB19_ERXCK; 515 AT91C_BASE_PIOB->PIO_PDR = 516 AT91C_PB12_ETX2 | AT91C_PB13_ETX3 | AT91C_PB14_ETXER | 517 AT91C_PB15_ERX2 | AT91C_PB16_ERX3 | AT91C_PB17_ERXDV | 518 AT91C_PB18_ECOL | AT91C_PB19_ERXCK; 519#endif 520 pEmac->EMAC_CTL = 0; 521 522 pEmac->EMAC_CFG = (pEmac->EMAC_CFG & ~(AT91C_EMAC_CLK)) | 523#ifdef BOOT_TSC 524 AT91C_EMAC_RMII | 525#endif 526 AT91C_EMAC_CLK_HCLK_32 | AT91C_EMAC_CAF; 527 // the sequence write EMAC_SA1L and write EMAC_SA1H must be respected 528 pEmac->EMAC_SA1L = localMAClow; 529 pEmac->EMAC_SA1H = localMAChigh; 530} 531 532 533/* 534 * .KB_C_FN_DEFINITION_START 535 * void SetServerIPAddress(unsigned address) 536 * This global function sets the IP of the TFTP download server. 537 * .KB_C_FN_DEFINITION_END 538 */ 539void 540SetServerIPAddress(unsigned address) 541{ 542 // force update in case the IP has changed 543 serverMACSet = 0; 544 545 serverIPAddr[0] = (address >> 24) & 0xFF; 546 serverIPAddr[1] = (address >> 16) & 0xFF; 547 serverIPAddr[2] = (address >> 8) & 0xFF; 548 serverIPAddr[3] = (address >> 0) & 0xFF; 549 550 serverIPSet = 1; 551} 552 553 554/* 555 * .KB_C_FN_DEFINITION_START 556 * void SetLocalIPAddress(unsigned address) 557 * This global function sets the IP of this module. 558 * .KB_C_FN_DEFINITION_END 559 */ 560void 561SetLocalIPAddress(unsigned address) 562{ 563 // force update in case the IP has changed 564 serverMACSet = 0; 565 566 localIPAddr[0] = (address >> 24) & 0xFF; 567 localIPAddr[1] = (address >> 16) & 0xFF; 568 localIPAddr[2] = (address >> 8) & 0xFF; 569 localIPAddr[3] = (address >> 0) & 0xFF; 570 571 localIPSet = 1; 572} 573 574 575/* 576 * .KB_C_FN_DEFINITION_START 577 * void TFTP_Download(unsigned address, char *filename) 578 * This global function initiates and processes a tftp download request. 579 * The server IP, local IP, local MAC must be set before this function is 580 * executed. 581 * .KB_C_FN_DEFINITION_END 582 */ 583void 584TFTP_Download(unsigned address, char *filename) 585{ 586 ip_header_t IpHeader; 587 unsigned thisSeconds; 588 int timeout; 589 590 if ((!localMACSet) || (!localIPSet) || (!serverIPSet)) 591 return ; 592 593 AT91F_EmacEntry(); 594 GetServerAddress(); 595 dlAddress = (char*)address; 596 lastSize = 0; 597 timeout = 10; 598 thisSeconds = GetSeconds() + 1; 599 serverPort = SWAP16(69); 600 ++localPort; 601 ackBlock = -1; 602 603 while (timeout) { 604 if (CheckForNewPacket(&IpHeader)) { 605 if (ackBlock == -2) 606 break; 607 timeout = 10; 608 thisSeconds = GetSeconds() + 1; 609 } else if (GetSeconds() > thisSeconds) { 610 --timeout; 611 thisSeconds = GetSeconds() + 1; 612 if (!serverMACSet) 613 GetServerAddress(); 614 else if (ackBlock == -1) 615 TFTP_RequestFile(filename); 616 else { 617 // Be sure to send a NAK, which is done by 618 // ACKing the last block we got. 619 TFTP_ACK_Data(0, ackBlock, 512); 620 printf("\nNAK %u\r\n", ackBlock); 621 } 622 } 623 } 624 if (timeout == 0) 625 printf("TFTP TIMEOUT!\r\n"); 626} 627 628 629/* 630 * .KB_C_FN_DEFINITION_START 631 * void EMAC_Init(void) 632 * This global function initializes variables used in tftp transfers. 633 * .KB_C_FN_DEFINITION_END 634 */ 635void 636EMAC_Init(void) 637{ 638 p_rxBD = (receive_descriptor_t*)RX_BUFFER_START; 639 localMACSet = 0; 640 serverMACSet = 0; 641 localIPSet = 0; 642 serverIPSet = 0; 643 localPort = SWAP16(0x8002); 644 lastSize = 0; 645} 646