1 | /*
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2 | * File: main.c
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3 | * Author: pkerspe
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4 | *
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5 | * Created on 26. Juli 2012, 09:49
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6 | */
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7 | #include <p18f4550.h>
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8 | #include <delays.h>
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9 | #include <timers.h>
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10 | #include <capture.h>
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11 |
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12 | #include <string.h>
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13 | #include <stdio.h>
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14 | #include <stdlib.h>
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15 |
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16 | #pragma config WDT = OFF
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17 | //#pragma config OSC = HS
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18 | //#pragma config OSCS = OFF
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19 | #pragma config PWRT = OFF
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20 | #pragma config BOR = OFF
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21 | #pragma config LVP = OFF
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22 |
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23 |
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24 | void main(void);
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25 | void setupIo(void);
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26 | void initComparator(void);
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27 | void InterruptHandlerHigh(void);
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28 | void initInterrupts(void);
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29 | void initCCP(void);
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30 |
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31 | void setupIo(){
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32 | TRISAbits.RA0 = 1; //set RA0 as input -> comparator C1 -input
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33 | TRISAbits.RA1 = 1; //set RA1 as input -> comparator C2 -input
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34 | TRISAbits.RA2 = 1; //set RA2 as input -> comparator C2 +input //not used in mode 110
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35 | TRISAbits.RA3 = 1; //set RA3 as input -> comparator C1 +input //not used in mode 110
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36 | TRISAbits.RA4 = 0; //set RA4 as output -> comparator C1 output
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37 | TRISAbits.RA5 = 0; //set RA5 as output -> comparator C2 output
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38 | TRISCbits.RC1 = 1; //set RC1 as input -> capture ccp1 trigger
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39 | TRISCbits.RC2 = 1; //set RC2 as input -> capture ccp2 trigger
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40 | }
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41 |
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42 | void initComparator(){
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43 | //CMCON = COMPARATOR CONTROL REGISTER
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44 | CMCONbits.C1OUT = 1;
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45 | CMCONbits.C2OUT = 1;
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46 | CMCONbits.C1INV = 1;
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47 | CMCONbits.C2INV = 1;
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48 | CMCONbits.CIS = 0; //Comparator Input Switch bit 0 = C1 VIN- connects to RA0/AN0 AND C2 VIN- connects to RA1/AN1
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49 | CMCONbits.CM2 = 1; //Comparator Mode bits CM2:CM0 -> 110 = 2 Comparators with internal ref voltage
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50 | CMCONbits.CM1 = 1;
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51 | CMCONbits.CM0 = 0;
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52 |
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53 | //init reference voltage
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54 | CVRCONbits.CVREN = 1; //Comparator Voltage Reference Enable bit
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55 | CVRCONbits.CVROE = 0; //Comparator VREF Output Enable bit (für multimeter ggf einschalten?)
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56 | //1 = CVREF voltage level is also output on the RA2/AN2/VREF-/CVREF pin
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57 | CVRCONbits.CVRR = 0; // Comparator VREF Range Selection bit
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58 | //1 = 0 to 0.667 CVRSRC, with CVRSRC/24 step size (low range)
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59 | //0 = 0.25 CVRSRC to 0.75 CVRSRC, with CVRSRC/32 step size (high range)
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60 | CVRCONbits.CVRSS = 0; //Comparator VREF Source Selection bit
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61 | // 1 = Comparator reference source, CVRSRC = (VREF+) ? (VREF-)
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62 | // 0 = Comparator reference source, CVRSRC = VDD ? VSS
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63 | CVRCONbits.CVR3 = 1;//CVR3:CVR0: Comparator VREF Value Selection bits (0 ? (CVR3:CVR0) ? 15)
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64 | CVRCONbits.CVR2 = 0;//When CVRR = 1: CVREF = ((CVR3:CVR0)/24) * (CVRSRC)
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65 | CVRCONbits.CVR1 = 0;//-> When CVRR = 0: CVREF = (CVRSRC/4) + ((CVR3:CVR0)/32) * (CVRSRC)
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66 | CVRCONbits.CVR0 = 1;// 0b1001 => 1,25 + (9/32 * 5) = 2,65625V
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67 | }
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68 |
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69 | void initInterrupts(){
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70 | //enable interrupts for comparator
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71 | RCONbits.IPEN = 1; //enable interrupt priority levels
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72 | INTCONbits.GIE = 1; //enable interrupts in general
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73 | INTCONbits.PEIE = 1; //external interrupts enabled
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74 |
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75 | PIR2bits.CMIF = 0; //reset CoMparatorInterruptFlag
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76 | PIE2bits.CMIE = 1; //enable comparator interrupt
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77 | IPR2bits.CMIP = 1; //set comparator interrupt to high priority
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78 |
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79 | //init interrupts for ccp1 and 2
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80 | PIE1bits.CCP1IE = 1;
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81 | PIE2bits.CCP2IE = 1;
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82 | }
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83 |
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84 | void initCCP(){
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85 | //ccp interrupts
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86 | PIR1bits.CCP1IF = 0;
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87 | PIR2bits.CCP2IF = 0;
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88 |
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89 | CCP1CON = 0b00000101; //Capture mode: every rising edge
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90 | CCP2CON = 0b00000101; //Capture mode: every rising edge
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91 |
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92 | T3CONbits.TMR3CS = 0; //Timer3 increments on every internal instruction cycle
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93 | T3CONbits.RD16 = 1; // enable 16 bit read for the timer3
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94 | T3CONbits.T3CCP1 = 1; //set timer3 as timer for ccp1
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95 | T3CONbits.T3CCP2 = 1; //set timer3 as timer for ccp2
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96 | T3CONbits.TMR3ON = 1;
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97 | }
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98 | /*
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99 | *
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100 | */
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101 | void main() {
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102 | setupIo();
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103 | initComparator();
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104 | initCCP();
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105 | initInterrupts();
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106 | while(1){
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107 | }
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108 | }
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109 |
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110 |
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111 | //----------------------------------------------------------------------------
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112 | // High priority interrupt vector
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113 | #pragma code InterruptVectorHigh = 0x08
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114 | void InterruptVectorHigh (void) {
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115 | _asm
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116 | goto InterruptHandlerHigh //jump to interrupt routine
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117 | _endasm
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118 | }
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119 |
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120 | //----------------------------------------------------------------------------
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121 | // High priority interrupt routine
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122 | #pragma code
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123 | #pragma interrupt InterruptHandlerHigh
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124 | void InterruptHandlerHigh () {
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125 | int test;
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126 | if (PIR2bits.CMIF){
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127 | PIE2bits.CMIE = 0;
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128 | PIR2bits.CMIF = 0; //clear interrupt flag
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129 |
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130 | if(CMCONbits.C1OUT){
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131 | test = 1;
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132 | CMCONbits.C1OUT = 0x00;
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133 | }
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134 | if(CMCONbits.C2OUT){
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135 | test = 2;
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136 | CMCONbits.C2OUT = 0x00;
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137 | }
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138 | PIE2bits.CMIE = 1; // re-enable interrupt for comparator
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139 | }
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140 | if(PIR2bits.CCP2IF){
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141 | PIR2bits.CCP2IF = 0b0; //clear interrupt flag
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142 | //PIE2bits.CCP2IE = 0;
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143 | test = ReadCapture2();
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144 | //PIE2bits.CCP2IE = 1; // re-enable interrupt for capture ccp
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145 | }
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146 | if(PIR1bits.CCP1IF){
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147 | //PIE1bits.CCP1IE = 0;
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148 | WriteTimer3(0);
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149 | PIR1bits.CCP1IF = 0; //clear interrupt flag
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150 | //add logic
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151 | test = ReadCapture1();
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152 | //PIE1bits.CCP1IE = 1; // re-enable interrupt for capture ccp
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153 | }
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154 | }
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