1 | unsigned int enc_receive_packet( unsigned int bufsize, unsigned char *buf )
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2 | {
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3 | unsigned char rxheader[6];
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4 | unsigned int len, status;
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5 | unsigned char u;
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6 |
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7 | // check rx packet counter
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8 | u = enc_read_reg( ENC_REG_EPKTCNT );
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9 | ENC_DEBUG("enc_receive: EPKTCNT=%i\n", (int) u);
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10 | if( u == 0 ) {
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11 | // packetcounter is 0, there is nothing to receive, go back
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12 | return 0;
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13 | }
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14 |
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15 | //set read pointer to next packet
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16 | enc_write_reg( ENC_REG_ERDPTL, LO8(enc_next_packet_ptr) );
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17 | enc_write_reg( ENC_REG_ERDPTH, HI8(enc_next_packet_ptr) );
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18 |
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19 | // read enc rx packet header
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20 | enc_read_buf( rxheader, sizeof(rxheader) );
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21 | enc_next_packet_ptr = rxheader[0];
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22 | enc_next_packet_ptr |= ((unsigned)(rxheader[1])) << 8;
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23 | len = rxheader[2];
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24 | len |= ((unsigned)(rxheader[3])) << 8;
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25 | status = rxheader[4];
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26 | status |= ((unsigned)(rxheader[5])) << 8;
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27 |
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28 | print("IN_STATUS: %4x ", status);
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29 | if ((status & 0x0010)) print("| CRC-ERROR ");
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30 | if ((status & 0x0020)) print("| LEN-CHECK-ERROR ");
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31 | if ((status & 0x0040)) print("| LENGHT Out RANGE ");
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32 | if ((status & 0x0080)) print("| RX OK ");
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33 | if ((status & 0x0100)) print("| RX MC ");
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34 | if ((status & 0x0200)) print("| RX BC" );
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35 | if ((status & 0x0800)) print("| RecControlFrame ");
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36 | if ((status & 0x2000)) print("| UNKNOWN-OPCODE ");
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37 | if ((status & 0x4000)) print("| DECTECT-VLAN ");
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38 | print("\r\n");
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39 |
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40 | // added by Sjors: reset the ENC when needed
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41 | // If the receive OK bit is not 1 or the zero bit is not zero, or the packet is larger then the buffer, reset the enc chip and SPI
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42 | if ((!(status & (1<<7))) || (status & 0x8000) || (len > bufsize))
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43 | {
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44 | enc_init();
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45 | }
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46 | //ENC_DEBUG("enc_receive: status=%4x\n", (unsigned) status);
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47 |
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48 | // skip the checksum (4 bytes) at the end of the buffer
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49 | len -= 4;
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50 |
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51 | // if the application buffer is to small, we just truncate
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52 | if( len > bufsize ) len = bufsize;
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53 |
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54 | // now read the packet data into buffer
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55 | enc_read_buf( buf, len );
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56 |
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57 | // adjust the ERXRDPT pointer (= free this packet in rx buffer)
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58 | if( enc_next_packet_ptr-1 > ENC_RX_BUFFER_END
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59 | || enc_next_packet_ptr-1 < ENC_RX_BUFFER_START ) {
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60 | enc_write_reg( ENC_REG_ERXRDPTL, LO8(ENC_RX_BUFFER_END) );
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61 | enc_write_reg( ENC_REG_ERXRDPTH, HI8(ENC_RX_BUFFER_END) );
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62 | } else {
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63 | enc_write_reg( ENC_REG_ERXRDPTL, LO8(enc_next_packet_ptr-1) );
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64 | enc_write_reg( ENC_REG_ERXRDPTH, HI8(enc_next_packet_ptr-1) );
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65 | }
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66 |
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67 | // trigger a decrement of the rx packet counter
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68 | // this will clear PKTIF if EPKTCNT reaches 0
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69 | enc_setbits_reg( ENC_REG_ECON2, (1<<ENC_BIT_PKTDEC) );
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70 |
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71 | // return number of bytes written to the buffer
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72 | ENC_DEBUG("enc_receive: %i bytes\n", len);
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73 | return len;
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74 | }
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