1 /******************************************************************
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3 ***** Name: cs8900.c *****
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4 ***** Ver.: 1.0 *****
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5 ***** Date: 07/05/2001 *****
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6 ***** Auth: Andreas Dannenberg *****
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7 ***** HTWK Leipzig *****
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8 ***** university of applied sciences *****
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10 ***** Func: ethernet packet-driver for use with LAN- *****
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11 ***** controller CS8900 from Crystal/Cirrus Logic *****
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13 ***** Keil: Module modified for use with Philips *****
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14 ***** LPC2378 EMAC Ethernet controller *****
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16 ******************************************************************/
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18 /* Adapted from file originally written by Andreas Dannenberg. Supplied with permission. */
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20 #include "FreeRTOS.h"
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21 #include "semphr.h"
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25 /* The semaphore used to wake the uIP task when data arives. */
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26 xSemaphoreHandle xEMACSemaphore = NULL;
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28 static unsigned short *rptr;
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29 static unsigned short *tptr;
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31 // easyWEB internal function
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32 // help function to swap the byte order of a WORD
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34 static unsigned short SwapBytes(unsigned short Data)
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36 return (Data >> 8) | (Data << 8);
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39 // Keil: function added to write PHY
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40 void write_PHY (int PhyReg, int Value)
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44 MAC_MADR = DP83848C_DEF_ADR | PhyReg;
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47 /* Wait utill operation completed */
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49 for (tout = 0; tout < MII_WR_TOUT; tout++) {
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50 if ((MAC_MIND & MIND_BUSY) == 0) {
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57 // Keil: function added to read PHY
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58 unsigned short read_PHY (unsigned char PhyReg)
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62 MAC_MADR = DP83848C_DEF_ADR | PhyReg;
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63 MAC_MCMD = MCMD_READ;
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65 /* Wait until operation completed */
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67 for (tout = 0; tout < MII_RD_TOUT; tout++) {
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68 if ((MAC_MIND & MIND_BUSY) == 0) {
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77 // Keil: function added to initialize Rx Descriptors
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78 void rx_descr_init (void)
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82 for (i = 0; i < NUM_RX_FRAG; i++) {
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83 RX_DESC_PACKET(i) = RX_BUF(i);
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84 RX_DESC_CTRL(i) = RCTRL_INT | (ETH_FRAG_SIZE-1);
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85 RX_STAT_INFO(i) = 0;
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86 RX_STAT_HASHCRC(i) = 0;
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89 /* Set EMAC Receive Descriptor Registers. */
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90 MAC_RXDESCRIPTOR = RX_DESC_BASE;
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91 MAC_RXSTATUS = RX_STAT_BASE;
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92 MAC_RXDESCRIPTORNUM = NUM_RX_FRAG-1;
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94 /* Rx Descriptors Point to 0 */
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95 MAC_RXCONSUMEINDEX = 0;
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99 // Keil: function added to initialize Tx Descriptors
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100 void tx_descr_init (void) {
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103 for (i = 0; i < NUM_TX_FRAG; i++) {
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104 TX_DESC_PACKET(i) = TX_BUF(i);
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105 TX_DESC_CTRL(i) = 0;
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106 TX_STAT_INFO(i) = 0;
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109 /* Set EMAC Transmit Descriptor Registers. */
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110 MAC_TXDESCRIPTOR = TX_DESC_BASE;
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111 MAC_TXSTATUS = TX_STAT_BASE;
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112 MAC_TXDESCRIPTORNUM = NUM_TX_FRAG-1;
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114 /* Tx Descriptors Point to 0 */
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115 MAC_TXPRODUCEINDEX = 0;
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119 // configure port-pins for use with LAN-controller,
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120 // reset it and send the configuration-sequence
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122 portBASE_TYPE Init_EMAC(void)
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124 portBASE_TYPE xReturn = pdPASS;
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126 // Keil: function modified to access the EMAC
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127 // Initializes the EMAC ethernet controller
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128 volatile unsigned int regv,tout,id1,id2;
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130 /* Enable P1 Ethernet Pins. */
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131 PINSEL2 = configPINSEL2_VALUE;
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132 PINSEL3 = (PINSEL3 & ~0x0000000F) | 0x00000005;
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134 /* Power Up the EMAC controller. */
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135 PCONP |= 0x40000000;
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138 /* Reset all EMAC internal modules. */
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139 MAC_MAC1 = MAC1_RES_TX | MAC1_RES_MCS_TX | MAC1_RES_RX | MAC1_RES_MCS_RX | MAC1_SIM_RES | MAC1_SOFT_RES;
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140 MAC_COMMAND = CR_REG_RES | CR_TX_RES | CR_RX_RES;
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142 /* A short delay after reset. */
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145 /* Initialize MAC control registers. */
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146 MAC_MAC1 = MAC1_PASS_ALL;
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147 MAC_MAC2 = MAC2_CRC_EN | MAC2_PAD_EN;
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148 MAC_MAXF = ETH_MAX_FLEN;
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149 MAC_CLRT = CLRT_DEF;
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150 MAC_IPGR = IPGR_DEF;
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152 /* Enable Reduced MII interface. */
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153 MAC_COMMAND = CR_RMII | CR_PASS_RUNT_FRM;
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155 /* Reset Reduced MII Logic. */
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156 MAC_SUPP = SUPP_RES_RMII;
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159 /* Put the DP83848C in reset mode */
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160 write_PHY (PHY_REG_BMCR, 0x8000);
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161 write_PHY (PHY_REG_BMCR, 0x8000);
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163 /* Wait for hardware reset to end. */
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164 for (tout = 0; tout < 100; tout++) {
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166 regv = read_PHY (PHY_REG_BMCR);
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167 if (!(regv & 0x8000)) {
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168 /* Reset complete */
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173 /* Check if this is a DP83848C PHY. */
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174 id1 = read_PHY (PHY_REG_IDR1);
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175 id2 = read_PHY (PHY_REG_IDR2);
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176 if (((id1 << 16) | (id2 & 0xFFF0)) == DP83848C_ID) {
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177 /* Configure the PHY device */
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179 /* Use autonegotiation about the link speed. */
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180 write_PHY (PHY_REG_BMCR, PHY_AUTO_NEG);
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181 /* Wait to complete Auto_Negotiation. */
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182 for (tout = 0; tout < 10; tout++) {
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184 regv = read_PHY (PHY_REG_BMSR);
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185 if (regv & 0x0020) {
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186 /* Autonegotiation Complete. */
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196 /* Check the link status. */
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197 if( xReturn == pdPASS )
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200 for (tout = 0; tout < 10; tout++) {
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202 regv = read_PHY (PHY_REG_STS);
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203 if (regv & 0x0001) {
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211 if( xReturn == pdPASS )
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213 /* Configure Full/Half Duplex mode. */
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214 if (regv & 0x0004) {
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215 /* Full duplex is enabled. */
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216 MAC_MAC2 |= MAC2_FULL_DUP;
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217 MAC_COMMAND |= CR_FULL_DUP;
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218 MAC_IPGT = IPGT_FULL_DUP;
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221 /* Half duplex mode. */
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222 MAC_IPGT = IPGT_HALF_DUP;
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225 /* Configure 100MBit/10MBit mode. */
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226 if (regv & 0x0002) {
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231 /* 100MBit mode. */
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232 MAC_SUPP = SUPP_SPEED;
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235 /* Set the Ethernet MAC Address registers */
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236 MAC_SA0 = (emacETHADDR0 << 8) | emacETHADDR1;
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237 MAC_SA1 = (emacETHADDR2 << 8) | emacETHADDR3;
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238 MAC_SA2 = (emacETHADDR4 << 8) | emacETHADDR5;
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240 /* Initialize Tx and Rx DMA Descriptors */
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244 /* Receive Broadcast and Perfect Match Packets */
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245 MAC_RXFILTERCTRL = RFC_UCAST_EN | RFC_BCAST_EN | RFC_PERFECT_EN;
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247 /* Create the semaphore used ot wake the uIP task. */
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248 vSemaphoreCreateBinary( xEMACSemaphore );
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250 /* Reset all interrupts */
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251 MAC_INTCLEAR = 0xFFFF;
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253 /* Enable receive and transmit mode of MAC Ethernet core */
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254 MAC_COMMAND |= (CR_RX_EN | CR_TX_EN);
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255 MAC_MAC1 |= MAC1_REC_EN;
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262 // reads a word in little-endian byte order from RX_BUFFER
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264 unsigned short ReadFrame_EMAC(void)
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269 // reads a word in big-endian byte order from RX_FRAME_PORT
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270 // (useful to avoid permanent byte-swapping while reading
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273 unsigned short ReadFrameBE_EMAC(void)
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275 unsigned short ReturnValue;
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277 ReturnValue = SwapBytes (*rptr++);
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278 return (ReturnValue);
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282 // copies bytes from frame port to MCU-memory
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283 // NOTES: * an odd number of byte may only be transfered
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284 // if the frame is read to the end!
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285 // * MCU-memory MUST start at word-boundary
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287 void CopyFromFrame_EMAC(void *Dest, unsigned short Size)
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289 unsigned short * piDest; // Keil: Pointer added to correct expression
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291 piDest = Dest; // Keil: Line added
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293 *piDest++ = ReadFrame_EMAC();
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297 if (Size) { // check for leftover byte...
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298 *(unsigned char *)piDest = (char)ReadFrame_EMAC();// the LAN-Controller will return 0
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299 } // for the highbyte
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302 // does a dummy read on frame-I/O-port
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303 // NOTE: only an even number of bytes is read!
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305 void DummyReadFrame_EMAC(unsigned short Size) // discards an EVEN number of bytes
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313 // Reads the length of the received ethernet frame and checks if the
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314 // destination address is a broadcast message or not
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315 // returns the frame length
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316 unsigned short StartReadFrame(void) {
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317 unsigned short RxLen;
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320 idx = MAC_RXCONSUMEINDEX;
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321 RxLen = (RX_STAT_INFO(idx) & RINFO_SIZE) - 3;
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322 rptr = (unsigned short *)RX_DESC_PACKET(idx);
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326 void EndReadFrame(void) {
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329 /* DMA free packet. */
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330 idx = MAC_RXCONSUMEINDEX;
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332 if (++idx == NUM_RX_FRAG)
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335 MAC_RXCONSUMEINDEX = idx;
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338 unsigned int CheckFrameReceived(void) { // Packet received ?
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340 if (MAC_RXPRODUCEINDEX != MAC_RXCONSUMEINDEX) // more packets received ?
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346 unsigned int uiGetEMACRxData( unsigned char *ucBuffer )
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348 unsigned int uiLen = 0;
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350 if( MAC_RXPRODUCEINDEX != MAC_RXCONSUMEINDEX )
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352 uiLen = StartReadFrame();
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353 CopyFromFrame_EMAC( ucBuffer, uiLen );
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360 // requests space in EMAC memory for storing an outgoing frame
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362 void RequestSend(void)
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366 idx = MAC_TXPRODUCEINDEX;
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367 tptr = (unsigned short *)TX_DESC_PACKET(idx);
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370 // check if ethernet controller is ready to accept the
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371 // frame we want to send
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373 unsigned int Rdy4Tx(void)
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375 return (1); // the ethernet controller transmits much faster
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376 } // than the CPU can load its buffers
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379 // writes a word in little-endian byte order to TX_BUFFER
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380 void WriteFrame_EMAC(unsigned short Data)
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385 // copies bytes from MCU-memory to frame port
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386 // NOTES: * an odd number of byte may only be transfered
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387 // if the frame is written to the end!
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388 // * MCU-memory MUST start at word-boundary
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390 void CopyToFrame_EMAC(void *Source, unsigned int Size)
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392 unsigned short * piSource;
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395 Size = (Size + 1) & 0xFFFE; // round Size up to next even number
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397 WriteFrame_EMAC(*piSource++);
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402 void DoSend_EMAC(unsigned short FrameSize)
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406 idx = MAC_TXPRODUCEINDEX;
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407 TX_DESC_CTRL(idx) = FrameSize | TCTRL_LAST;
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408 if (++idx == NUM_TX_FRAG) idx = 0;
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409 MAC_TXPRODUCEINDEX = idx;
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