1 | static inline void xspi_put( unsigned char value )
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2 | {
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3 | //ENC_DEBUG("spi_put(%2x)\n", (unsigned) value );
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4 | SPDR = value;
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5 | while( !(SPSR & (1<<SPIF)) ) ;
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6 | }
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7 |
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8 | static inline unsigned char xspi_get(void)
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9 | {
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10 | unsigned char value = SPDR;
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11 | //ENC_DEBUG("spi_get()=%2x\n", (unsigned) value );
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12 | return value;
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13 | }
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14 |
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15 |
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16 | static void enc_read_buf( unsigned char *buf, unsigned int len )
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17 | {
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18 | enc_select();
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19 | spi_put( ENC_SPI_OP_RBM );
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20 | //if(len > 0){len--; buf++ ;*(buf) = xspi_get();}
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21 | for(; len > 0; len--, buf++ ) {
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22 | xspi_put( 0x00 );
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23 | *(buf) = xspi_get();
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24 | }
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25 | enc_deselect();
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26 | }
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27 |
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28 |
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29 |
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30 | unsigned int enc_receive_packet( unsigned int bufsize, unsigned char *buf )
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31 | {
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32 | unsigned char rxheader[18];
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33 | unsigned int len, status;
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34 | unsigned char u;
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35 |
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36 | // check rx packet counter
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37 | u = enc_read_reg( ENC_REG_EPKTCNT );
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38 | ENC_DEBUG("enc_receive: EPKTCNT=%i\n", (int) u);
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39 | if( u == 0 ) {
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40 | // packetcounter is 0, there is nothing to receive, go back
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41 | return 0;
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42 | }
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43 |
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44 | //set read pointer to next packet
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45 | enc_write_reg( ENC_REG_ERDPTL, LO8(enc_next_packet_ptr) );
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46 | enc_write_reg( ENC_REG_ERDPTH, HI8(enc_next_packet_ptr) );
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47 |
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48 | // read enc rx packet header
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49 | enc_read_buf( rxheader, 6 );
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50 | enc_next_packet_ptr = rxheader[0];
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51 | enc_next_packet_ptr |= ((unsigned)(rxheader[1])) << 8;
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52 | len = rxheader[2];
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53 | len |= ((unsigned)(rxheader[3])) << 8;
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54 | status = rxheader[4];
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55 | status |= ((unsigned)(rxheader[5])) << 8;
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56 |
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57 | //kk
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58 | ePtr=enc_next_packet_ptr;
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59 | eLen=len;
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60 | eStatus=status;
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61 |
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62 | /*
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63 | //kk
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64 | //kein Fehler:
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65 | for(i=6;i<12;i++){
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66 | tmp_macd[i-6]=rxheader[i];
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67 | }
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68 |
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69 | for(i=12;i<18;i++){
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70 | tmp_macs[i-12]=rxheader[i];
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71 | }
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72 |
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73 |
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74 | //Fehler:
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75 | enc_read_buf( tmp_macd, 6 );//1.byte wird ausgelassen
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76 | enc_read_buf( tmp_macs, 6 );//1.byte wird ausgelassen
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77 | */
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78 | // added by Sjors: reset the ENC when needed
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79 | // 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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80 | if ((!(status & (1<<7))) || (status & 0x8000) || (len > bufsize))
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81 | {
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82 | enc_init();
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83 | }
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84 | //ENC_DEBUG("enc_receive: status=%4x\n", (unsigned) status);
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85 |
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86 | // skip the checksum (4 bytes) at the end of the buffer
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87 | len -= 4;
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88 |
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89 | // if the application buffer is to small, we just truncate
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90 | if( len > bufsize ) len = bufsize;
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91 |
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92 | // now read the packet data into buffer
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93 | enc_read_buf( buf, len );//1.byte wird ausgelassen
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94 |
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95 |
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96 |
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97 | // adjust the ERXRDPT pointer (= free this packet in rx buffer)
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98 | if( enc_next_packet_ptr-1 > ENC_RX_BUFFER_END
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99 | || enc_next_packet_ptr-1 < ENC_RX_BUFFER_START ) {
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100 | enc_write_reg( ENC_REG_ERXRDPTL, LO8(ENC_RX_BUFFER_END) );
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101 | enc_write_reg( ENC_REG_ERXRDPTH, HI8(ENC_RX_BUFFER_END) );
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102 | } else {
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103 | enc_write_reg( ENC_REG_ERXRDPTL, LO8(enc_next_packet_ptr-1) );
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104 | enc_write_reg( ENC_REG_ERXRDPTH, HI8(enc_next_packet_ptr-1) );
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105 | }
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106 |
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107 | // trigger a decrement of the rx packet counter
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108 | // this will clear PKTIF if EPKTCNT reaches 0
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109 | enc_setbits_reg( ENC_REG_ECON2, (1<<ENC_BIT_PKTDEC) );
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110 |
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111 | // return number of bytes written to the buffer
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112 | ENC_DEBUG("enc_receive: %i bytes\n", len);
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113 | return len;
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114 | }
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