Hi,
kann mir jemand sagen ob meine xmega routine für das twi modul so
richtig und funktionsfähig ist und was ich besser/anderst machen sollte.
Danke.
1 | void init_twie(void)
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2 | {
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3 |
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4 | TWIE.MASTER.BAUD = TWI_BAUD(F_CPU, BAUDRATE);
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5 | TWIE.MASTER.CTRLA = TWI_MASTER_INTLVL_OFF_gc | TWI_MASTER_ENABLE_bm;
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6 | //TWIE.MASTER.CTRLB
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7 | //TWIE.MASTER.CTRLC
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8 | TWIE.MASTER.STATUS = TWI_MASTER_BUSSTATE_IDLE_gc;
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9 |
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10 | PORTE.DIRSET |= PIN0_bm;
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11 | PORTE.DIRSET |= PIN1_bm;
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12 |
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13 | }
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14 |
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15 |
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16 |
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17 | unsigned char twie_write(unsigned char data)
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18 | {
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19 |
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20 | unsigned char status;
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21 |
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22 |
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23 | TWIE.MASTER.DATA = data;
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24 |
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25 |
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26 | status = TWIE.MASTER.STATUS;
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27 |
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28 | if (status & TWI_MASTER_RXACK_bm) //Sende STOP wenn Slave NACK zurück gibt
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29 | {
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30 | TWIE.MASTER.CTRLC = TWI_MASTER_CMD_STOP_gc;
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31 | return 0;
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32 | }
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33 | else if ((status & TWI_MASTER_ARBLOST_bm) || (status & TWI_MASTER_BUSERR_bm))
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34 | {
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35 | return 0;
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36 | }
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37 | else if (status & TWI_MASTER_WIF_bm)
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38 | {
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39 | return 1;
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40 | }
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41 |
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42 | return 1;
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43 |
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44 | }
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45 |
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46 |
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47 |
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48 | unsigned char twie_read_ack(void)
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49 | {
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50 |
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51 | unsigned char data;
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52 |
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53 | data = TWIE.MASTER.DATA;
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54 |
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55 | TWIE.MASTER.CTRLC = TWI_MASTER_CMD_RECVTRANS_gc; // Sende ACK
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56 |
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57 | return data;
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58 |
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59 | }
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60 |
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61 |
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62 | unsigned char twie_read_nack(void)
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63 | {
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64 |
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65 | unsigned char data;
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66 |
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67 | data = TWIE.MASTER.DATA;
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68 |
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69 | TWIE.MASTER.CTRLC = TWI_MASTER_ACKACT_bm | TWI_MASTER_CMD_STOP_gc; // Sende NACK
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70 |
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71 | return data;
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72 |
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73 | }
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74 |
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75 |
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76 | unsigned char twie_address(unsigned char device_address)
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77 | {
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78 |
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79 | unsigned char status;
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80 |
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81 |
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82 | TWIE.MASTER.ADDR = device_address; //Deviceadresse senden (START wird automatisch gesendet)
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83 |
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84 | status = TWIE.MASTER.STATUS;
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85 |
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86 |
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87 | if ((status & TWI_MASTER_ARBLOST_bm) || (status & TWI_MASTER_BUSERR_bm))
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88 | {
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89 | return 0;
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90 | }
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91 | else if (status & TWI_MASTER_WIF_bm)
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92 | {
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93 | return 1;
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94 | }
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95 | else if (status & TWI_MASTER_RIF_bm)
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96 | {
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97 | return 1;
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98 | }
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99 | else
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100 | {
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101 | return 0;
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102 | }
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103 |
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104 | }
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105 |
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106 |
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107 |
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108 | void twie_stop(void)
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109 | {
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110 |
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111 | TWIE.MASTER.CTRLC = TWI_MASTER_CMD_STOP_gc;
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112 |
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113 | }
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PS: Nein ich will nicht die Lib von Atmel verwenden :)
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