1 | int8_t initMCP2515(void)
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2 | {
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3 | uint16_t test;
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4 | char testtext[]= " . ";
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5 |
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6 | // Software-Reset durchführen
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7 | SPI_PORT &= ~(1<<SPI_SS);
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8 | SPI_PUT(MCP2515_RESET);
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9 | asm volatile ("nop");
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10 | SPI_PORT |= (1<<SPI_SS);
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11 | wait10ms(5);
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12 | asm volatile ("nop");
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13 | asm volatile ("nop");
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14 |
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15 | UART_Text_out("CANCTL:",0);
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16 | test = MCP2515_RDREG(CANCTRL);
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17 | testtext[1]=test;
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18 | UART_Text_out(testtext,1);
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19 |
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20 | UART_Text_out("CANSTAT:",0);
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21 | test = MCP2515_RDREG(CANSTAT);
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22 | testtext[1]=test;
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23 | UART_Text_out(testtext,1);
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24 |
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25 | MCP2515_WRREG( CNF1,(1<<BRP0)); //(0x01)
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26 |
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27 | test = MCP2515_RDREG( CNF1 );
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28 | testtext[1]=test;
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29 | UART_Text_out("CNF1:",0);
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30 | UART_Text_out(testtext,1);
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31 |
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32 | // MCP2515 zurueck in den normalen Modus versetzen
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33 | mcp2515_bit_modify( CANCTRL, 0xE0, 0);
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34 |
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35 | test = MCP2515_RDREG( CNF1 );
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36 | testtext[1]=test;
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37 | UART_Text_out("CNF1:",0);
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38 | UART_Text_out(testtext,1);
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39 | }
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40 |
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41 | void wait10ms(uint16_t xms) // wartet xms*10ms
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42 | {
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43 | for(uint8_t i=0 ; i<xms; i++)
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44 | {
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45 | _delay_ms(mswait); // Argument muss Konstante sein!
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46 | }
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47 | }
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48 |
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49 | uint8_t SPI_PUT(uint8_t cData)
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50 | {
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51 | /* Start transmission */
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52 | SPDR = cData;
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53 | /* Wait for transmission complete */
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54 | while(!(SPSR & (1<<SPIF)))
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55 | ;
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56 | //loop_until_bit_is_set(SPSR,SPIF); // warten bis das Byte gesendet wurde
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57 | return SPDR;
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58 | }
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59 |
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60 | uint8_t MCP2515_WRREG(uint8_t Adresse, uint8_t Daten)
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61 | {
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62 | SPI_PORT &= ~(1<<SPI_SS);
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63 | SPI_PUT(MCP2515_WRITE);
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64 | SPI_PUT(Adresse);
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65 | SPI_PUT(Daten);
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66 | SPI_PORT |= (1<<SPI_SS);
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67 | return 0;
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68 | }
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69 |
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70 | uint8_t MCP2515_RDREG(uint8_t Adresse)
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71 | {
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72 | uint8_t Daten;
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73 | SPI_PORT &= ~(1<<SPI_SS);
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74 | SPI_PUT(MCP2515_READ);
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75 | SPI_PUT(Adresse);
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76 | Daten = SPI_PUT(0xaa);
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77 | SPI_PORT |= (1<<SPI_SS);
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78 | return Daten;
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79 | }
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80 |
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81 | uint8_t MCP2515_READ_STATUS(void)
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82 | {
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83 | uint8_t status;
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84 | // Status des MCP2515 auslesen
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85 | SPI_PORT &= ~(1<<SPI_SS);
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86 | SPI_PUT(MCP2515_READ_STAT);
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87 | status = SPI_PUT(0xaa);
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88 | SPI_PUT(0xaa);
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89 | SPI_PORT |= (1<<SPI_SS);
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90 | return status;
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91 | }
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92 |
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93 | uint8_t mcp2515_bit_modify(uint8_t adress, uint8_t mask, uint8_t data)
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94 | {
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95 | // /CS des MCP2515 auf Low ziehen
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96 | SPI_PORT &= ~(1<<SPI_SS);
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97 | SPI_PUT(MCP2515_BIT_MODIFY);
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98 | SPI_PUT(adress);
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99 | SPI_PUT(mask);
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100 | SPI_PUT(data);
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101 | // /CS Leitung wieder freigeben
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102 | SPI_PORT |= (1<<SPI_SS);
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103 | return 0;
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104 | }
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105 |
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106 | int8_t init_SPI_Master(void)
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107 | {
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108 | /* Set MOSI and SCK output, all others input */
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109 | SPI_DDR |= ((1<<SPI_MOSI)|(1<<SPI_SCK)|(1<<SPI_SS));
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110 | SPI_DDR &= ~(1<<SPI_MISO);
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111 |
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112 | SPI_PORT |= (1<<SPI_MISO); // Pull-up EIN
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113 |
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114 | //SPI_PORT &= ~((1<<SPI_SCK)|(1<<SPI_MOSI)|(1<<SPI_MISO));
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115 | SPI_PORT |= (1<<SPI_SS); // SS HIGH
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116 |
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117 | /* Enable SPI, Master, set clock rate fck/16 */
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118 | //SPCR = 0;
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119 | //SPCR |= ((1<<SPE)|(1<<MSTR)|(1<<SPR0)|(1<<SPR1));
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120 |
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121 | SPCR = ((1<<SPE)|(1<<MSTR)|(1<<SPR0)|(1<<SPR1));
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122 | SPSR = (1<<SPI2X);
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123 | return 0;
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124 | }
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