1 | #pragma udata
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2 | unsigned char SI470xdata[31]; // Commandopacket für SI4701
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3 |
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4 | //
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5 | #pragma code
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6 | /******************************************************************************
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7 | * Function: void InitSI470x(void)
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8 | *
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9 | * PreCondition: None
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10 | *
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11 | * Input: None
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12 | *
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13 | * Output: None
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14 | *
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15 | * Side Effects: None
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16 | *
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17 | * Overview: Enables the SI470x
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18 | *
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19 | * Note: None
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20 | *****************************************************************************/
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21 | void SI470xInit(void)
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22 | {
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23 | SSP2CON1bits.SSPEN = 0; // I2C for startup as IO
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24 | TRISDbits.TRISD5 = 0; // output
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25 | TRISDbits.TRISD6 = 0; // output
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26 | TRISBbits.TRISB4 = 0; // output
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27 | LATDbits.LATD5 = 0; //
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28 | LATDbits.LATD6 = 0;
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29 | LATBbits.LATB4 = 0; // SI4701 reset, GPIO3 automatically low by internal pulldown
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30 | Delay1KTCYx(10);
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31 | LATBbits.LATB4 = 1; // SI4701 start, wait for Powerup
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32 | Delay1KTCYx(10); // SDO MUST BE LOW DURING THIS PERIOD
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33 | TRISDbits.TRISD5 = 1; // input again
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34 | TRISDbits.TRISD6 = 1; // input again
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35 | T1CON = 0x4B; // T1 OSC, OSC EN, start reference clock
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36 | I2CStart();
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37 | I2CTransmit(SI470x_write);
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38 | I2CAckTx();
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39 | I2CTransmit(0x40); // See AN230
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40 | I2CAckTx();
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41 | I2CTransmit(0x01); // Reg 0x2: Enable, demute
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42 | I2CAckTx();
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43 | I2CStop();
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44 | Delay10KTCYx(132); // wait 110ms until powerup is complete
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45 | SI470xClearData();
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46 | // Init Array with correct values
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47 | SI470xdata[Powercfg_h] = SI47_DMUTE;
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48 | SI470xdata[Powercfg_l] = SI47_ENABLE;
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49 | SI470xdata[Channel_h] = !SI47_TUNE;
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50 | SI470xdata[Sysconfig1_h] = SI47_RDS | SI47_DE;
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51 | SI470xdata[Sysconfig1_l] = SI47_BLNDADJ_DEF | SI47_GPIO3_HI | SI47_GPIO2_LO | SI47_GPIO1_HI;
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52 | SI470xdata[Sysconfig2_h] = SI47_SEEKTH;
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53 | SI470xdata[Sysconfig2_l] = SI47_BAND_USA_EUR | SI47_SPACE_100KHZ | SI47_VOLUME;
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54 | SI470xdata[Sysconfig3_h] = SI47_SMUTER_FASTEST | SI47_SMUTEA_16DB;
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55 | SI470xdata[Sysconfig3_l] = SI47_SKSNR | SI47_SKCNT;
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56 | SI470xSend();
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57 | Delay1TCY();
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58 | SI470xRead(); // Status, IDs, etc
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59 | }
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60 |
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61 | /******************************************************************************
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62 | * Function: void SendSI470x(void)
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63 | *
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64 | * PreCondition: Arry with Command is properly initialised
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65 | *
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66 | * Input: Array SI470xdata with commands
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67 | *
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68 | * Output: None
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69 | *
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70 | * Side Effects: None
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71 | *
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72 | * Overview: Send packet of commands to SI470x
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73 | *
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74 | * Note: None
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75 | *****************************************************************************/
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76 | void SI470xSend(void)
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77 | {
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78 | unsigned char i;
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79 | I2CStart();
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80 | I2CTransmit(SI470x_write);
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81 | I2CAckTx();
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82 | for (i=0; i < 10; i++)
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83 | {
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84 | I2CTransmit(SI470xdata[Powercfg_h+i]); //
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85 | I2CAckTx(); //
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86 | }
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87 | I2CStop();
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88 | }
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89 |
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90 | /******************************************************************************
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91 | * Function: void ReadSI470x(void)
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92 | *
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93 | * PreCondition: None
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94 | *
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95 | * Input: Array SI470xdata will be updated with read-only values
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96 | *
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97 | * Output: None
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98 | *
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99 | * Side Effects: None
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100 | *
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101 | * Overview: Read From
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102 | *
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103 | * Note: None
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104 | *****************************************************************************/
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105 | void SI470xRead(void)
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106 | {
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107 | unsigned char i;
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108 | I2CStart();
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109 | I2CTransmit(SI470x_read);
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110 | I2CAckTx();
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111 | for(i=0; i<12; i++)
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112 | {
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113 | SI470xdata[i+StatusRSSI_h] = I2CReceive(); // read beginns on register 10
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114 | I2CAckRx();
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115 | }
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116 | for(i=0; i<4; i++) // Array is only 32Byte
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117 | { // To wrap araound, new read cycle is needed
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118 | SI470xdata[i] = I2CReceive();
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119 | I2CAckRx();
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120 | }
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121 | I2CReceive(); //dummyread without Ack to end transmission
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122 | I2CNAckRx();
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123 | I2CStop();
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124 | }
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