1 | #include <htc.h>
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2 |
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3 | __CONFIG(1, FCMDIS & IESODIS & HS);
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4 | __CONFIG(2, BORDIS & BORV45 & PWRTEN & WDTDIS & WDTPS1);
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5 | __CONFIG(3, CCP2RB3 & LPT1DIS & 0xFDFF);
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6 | __CONFIG(4, DEBUGDIS & XINSTDIS & LVPDIS & STVRDIS);
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7 | __CONFIG(5, 0xFFFF);
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8 | __CONFIG(6, 0xFFFF);
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9 | __CONFIG(7, 0xFFFF);
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10 |
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11 | #define storage_reg PORTCbits.RC2
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12 |
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13 |
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14 | //prototypes
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15 | void wait (unsigned int);
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16 | void showInt595(unsigned);
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17 |
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18 |
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19 | void main (void)
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20 | {
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21 |
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22 | unsigned int uValue;
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23 |
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24 | /***************************************************************
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25 | * 20.07.2011
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26 | * spi 74HC595 shift register test
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27 | *
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28 | * Lines for PIC 18F4550:
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29 | * clk: RB1, Pin34
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30 | * Ser out, (in for '595): RC7, Pin14
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31 | * /G (output enable): RC6 (mußt be low)
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32 | * storage register: RC2, Pin12
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33 | * RD2: /SCLR clear latch (testing...)
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34 | **************************************************************/
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35 | // port directions: 1=input, 0=output
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36 |
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37 | PORTB = 0b00000000; //clear output data latch
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38 | TRISB = 0b00000000; //set to output
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39 |
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40 | PORTC = 0b00000000; //clear output data latch
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41 | TRISC = 0b00000000; //set to output
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42 |
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43 | PORTD = 0b00000000; //clear output data latch
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44 | TRISD = 0b00000000; //set to output
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45 |
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46 | //while (1) {
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47 | PORTCbits.RC0=1; // Einschalt-LED
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48 | wait (300);
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49 | PORTCbits.RC0=0; // Einschalt-LED
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50 | //wait (300);
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51 | //}
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52 |
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53 | OpenSPI (SPI_FOSC_64, MODE_10, SMPMID);
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54 |
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55 | showInt595(0x0001);
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56 | wait (300);
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57 |
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58 | showInt595(0x0002);
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59 | wait (300);
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60 |
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61 | showInt595(0x0004);
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62 | wait (300);
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63 |
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64 | while (1);
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65 | } // Ende main
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66 |
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67 |
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68 | //wait
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69 | void wait(unsigned int a) {
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70 | unsigned int i,j;
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71 | for (i = 0; i < a ; i++) {
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72 | for (j = 1 ; j < 1000; j++);
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73 | }
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74 | }
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75 |
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76 |
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77 |
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78 | /***************************************************************
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79 | * 20.07.2011
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80 | *
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81 | *
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82 | * precondition:
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83 | * Lines for PIC 18F4550 mußt be properly initialised
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84 | * clk: RB1, Pin34, Pin11 at '595
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85 | * Ser out: RC7, Pin14 at '595
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86 | * free selectable: output storage register: RC2 Pin17, Pin12 at '595
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87 | *
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88 | * /G (output enable): Pin13 on gnd
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89 | * /SCLR (clear shift register) Pin10 on Vcc
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90 | * /Qh (Pin9) output to the next 595's serial in, input Pin14
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91 | *
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92 | *
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93 | **************************************************************/
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94 | void showInt595 (unsigned uPattern)
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95 | {
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96 |
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97 | unsigned uDummy1,uDummy2; // = unsigned int
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98 |
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99 |
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100 | unsigned char ucPattern;
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101 |
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102 | //'595 No1
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103 | //die 16bit in 2x 8bit zerlegen, unteres Byte:
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104 | uDummy1 = uPattern;
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105 | uDummy1= uDummy1 & 0x00FF;
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106 | uDummy1 = (unsigned char) uDummy1; //ist das eigentlich erlaubt bzw. notwendig???
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107 | ucPattern = uDummy1;
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108 |
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109 | WriteSPI(ucPattern);
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110 |
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111 | //wait (1); // PIG zu schnell...?
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112 | //storage_reg = 1; // würde zwar funktionieren, erzeugt aber
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113 | //storage_reg = 0; // ein kurzes störendes Blitzen auf den
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114 | // korrespondierenden 8 bits
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115 |
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116 | //'595 No2
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117 | //die 16bit in 2x 8bit zerlegen, oberes Byte:
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118 | uDummy2 = uPattern;
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119 | uDummy2 >>= 8;
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120 | uDummy2 = (unsigned char) uDummy2;
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121 | ucPattern = uDummy2;
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122 |
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123 | WriteSPI(ucPattern);
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124 |
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125 | wait (1); // PIG zu schnell...?
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126 | storage_reg = 1; // alle 16 bits ins Ausgaberegister
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127 | storage_reg = 0; // wieder freigeben
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128 | }
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