1 | #include <p18f46k22.h>
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2 | #include <delays.h>
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3 | #include <timers.h>
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4 | #include <stdio.h>
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5 | #include <string.h>
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6 | #include "Lcd.h"
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7 |
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8 |
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9 | #pragma config FOSC = INTIO7 // interner Takt
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10 | unsigned int uint_period1 = 0;
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11 | unsigned int uint_period2 = 0;
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12 | unsigned long int ulint_period = 0; //Differenz
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13 | unsigned char uchar_i = 0;
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14 | char char_Zeit[];
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15 | unsigned char i = 0;
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16 |
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17 |
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18 | /*----------------------------------------------------------------------------
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19 | ----- -----
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20 | ----- InterruptHandler -----
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21 | ----- -----
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22 | ---------------------------------------------------------------------------*/
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23 |
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24 | #pragma interruptlow InterruptHandler
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25 | void InterruptHandler (void)
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26 | {
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27 | // nur um zu sehen ob Timer überläuft
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28 | LATBbits.LATB1=~LATBbits.LATB1;
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29 | PIR1bits.TMR1IF=0; //setze Timer3 Interrupt Flag zurück
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30 | }
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31 | /*----------------------------------------------------------------------------
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32 | ----- -----
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33 | ----- Interruptvektoren setzen -----
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34 | ----- -----
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35 | ---------------------------------------------------------------------------*/
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36 | #pragma code _HIGH_INTERRUPT_VECTOR = 0x000008
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37 | void _high_ISR (void)
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38 | {
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39 | _asm
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40 | goto InterruptHandler // Sprung zur Interruptroutine
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41 | _endasm
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42 | }
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43 |
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44 | #pragma code _LOW_INTERRUPT_VECTOR = 0x000018
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45 | void _low_ISR (void)
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46 | {
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47 | _asm
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48 | goto InterruptHandler // Sprung zur Interruptroutine
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49 | _endasm
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50 | }
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51 | #pragma code
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52 |
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53 |
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54 |
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55 | /*----------------------------------------------------------------------------
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56 | ----- -----
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57 | ----- Initialisierung -----
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58 | ----- -----
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59 | ---------------------------------------------------------------------------*/
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60 | void init (void)
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61 | {
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62 | OSCCONbits.IRCF=0b101; //HFINTOSC interner Takt auf 4MHz -> CLKOUT = 1MHz
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63 | T1CON = 0x00; //Timer 1 mit FOSC/4, kein Prescaler für Capture, 16 Bit in eins lesen und STOP
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64 | ANSELCbits.ANSC2 = 0; // RC2 als digitaler
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65 | TRISCbits.TRISC2 = 1; // RC2 als Eingang für CCP1
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66 | PIE1bits.CCP1IE = 0; // kein Interrupt von CCP1
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67 | PIR1bits.CCP1IF = 0; // Interrupt Flag löschen
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68 |
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69 | //LCD starten PORTD als Ausgang damit LCD funktioniert
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70 | LATD=0x00;
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71 | ANSELD=0x00;
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72 | TRISD=0x00;
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73 | LCDInit();
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74 |
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75 | LATB=0x00;
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76 | ANSELB=0x00;
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77 | TRISB=0x00;
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78 |
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79 | //Interrupt für TIMER1 um zu sehen das Timer überläuft
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80 | PIE1bits.TMR1IE = 1; //TIMER1 Interrupt Enable
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81 |
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82 | INTCONbits.GIEH=1; //
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83 | INTCONbits.GIEL=1; //
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84 | INTCONbits.GIE = 1; //enable unmasked Interrupts Global
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85 | }
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86 |
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87 |
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88 | /*----------------------------------------------------------------------------
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89 | ----- -----
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90 | ----- MAIN -----
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91 | ----- -----
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92 | ---------------------------------------------------------------------------*/
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93 | void main(void)
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94 | {
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95 | init();
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96 | while(1)
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97 | {
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98 | TMR1L = 0x00; //setze Timer auf 0
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99 | TMR1H = 0x00;
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100 | uint_period1=0;
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101 | uint_period2=0;
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102 | ulint_period=0;
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103 |
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104 | T1CONbits.TMR1ON = 1; //starte Timer 1
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105 | CCP1CONbits.CCP1M = 0b111; // Capture bei jeder steigenden Flanke
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106 |
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107 | while (!(PIR1bits.CCP1IF)); //Warte auf erste steigende Flanke
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108 | PIR1bits.CCP1IF = 0;
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109 | uint_period1 = (unsigned int) CCPR1H; //speichere Zeitpunkt erster Flanke (16Bit-Wert)
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110 | uint_period1 = uint_period1<<8;
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111 | uint_period1 = uint_period1 + CCPR1L;
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112 |
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113 | while (!(PIR1bits.CCP1IF)); //Warte auf zweite steigende Flanke
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114 | CCP1CON = 0x00; //schalte Capture aus
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115 | T1CONbits.TMR1ON = 0; //stoppe Timer 1
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116 |
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117 | uint_period2 = (unsigned int) CCPR1H; //speichere Zeitpunkt zweiter Flanke (16Bit-Wert)
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118 | uint_period2 = uint_period2<<8;
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119 | uint_period2 = uint_period2 + CCPR1L;
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120 |
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121 | ulint_period = (long) uint_period2 - (long) uint_period1; //Zeitdifferenz bilden
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122 |
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123 | LCDClear();
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124 | LCDGoto(0,1);
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125 | LCDWriteStr("Zeit");
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126 | LCDGoto(0,0);
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127 |
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128 | ultoa(ulint_period, char_Zeit); // unsigend Long to Ascii (String)
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129 |
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130 | i=0;
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131 | while (char_Zeit[i] != 0x00) // Solange nicht NUL
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132 | {
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133 | LCDPutChar(char_Zeit[i]);
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134 | i++;
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135 | }
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136 |
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137 |
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138 | Delay1KTCYx(100);
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139 | }
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140 | }
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