1 | //ICC-AVR application builder : 13.04.2010 16:15:44
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2 | // Target : m48
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3 | // Crystal: 8.0000Mhz
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4 |
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5 | #include <iom48v.h>
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6 | #include <macros.h>
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7 |
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8 | unsigned char i = 0;
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9 | unsigned int result;
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10 |
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11 | void port_init(void)
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12 | {
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13 | PORTB = 0xF1;
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14 | DDRB = 0x0E;
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15 | PORTC = 0x43;
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16 | DDRC = 0xBC;
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17 | PORTD = 0x00;
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18 | DDRD = 0xFF;
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19 | }
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20 |
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21 | void timer0_init(void)
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22 | {
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23 | OCR0A = 0x80;
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24 | OCR0B = 0x80;
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25 | TCCR0A |= (1 << WGM01) | (1 << WGM00); // Fast PWM
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26 | TCCR0A |= (1 << COM0A1); // Fast PWM, non-inverting mode
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27 | TCCR0A &= ~(1 << COM0A0);
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28 | TCCR0A |= (1 << CS02); // Prescaler: 1/256
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29 |
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30 | // TCCR0B |= (1 << WGM01) | (1 << WGM00); // Fast PWM
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31 | // TCCR0B |= (1 << COM0B1); // Fast PWM, non-inverting mode
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32 | // TCCR0B &= ~(1 << COM0B0);
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33 | // TCCR0B |= (1 << CS02); // Prescaler: 1/256
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34 |
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35 |
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36 | }
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37 |
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38 | //TIMER1 initialize - prescale:64
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39 | // WGM: 0) Normal, TOP=0xFFFF
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40 | // desired value: 100mSec
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41 | // actual value: 100,000mSec (0,0%)
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42 | void timer1_init(void)
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43 | {
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44 | TCCR1B = 0x00; //stop
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45 | TCNT1H = 0xCF; //setup
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46 | TCNT1L = 0x2C;
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47 | OCR1AH = 0x30;
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48 | OCR1AL = 0xD4;
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49 | OCR1BH = 0x30;
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50 | OCR1BL = 0xD4;
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51 | ICR1H = 0x30;
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52 | ICR1L = 0xD4;
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53 | TCCR1A = 0x00;
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54 | TCCR1B = 0x03; //start Timer
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55 | }
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56 |
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57 | //ADC initialize
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58 | // Conversion time: 6uS
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59 | void adc_init(void)
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60 | {
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61 | ADCSRA = 0x00; //disable adc
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62 | ADMUX = 0x00; //select adc input 0
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63 | ACSR = 0x80;
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64 | ADCSRB = 0x00;
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65 | ADCSRA = 0x01;
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66 |
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67 | }
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68 |
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69 | #pragma interrupt_handler timer1_ovf_isr:iv_TIM1_OVF
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70 | void timer1_ovf_isr(void)
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71 | {
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72 | //TIMER1 has overflowed
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73 | TCNT1H = 0xCF; //reload counter high value
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74 | TCNT1L = 0x2C; //reload counter low value
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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 | // AD-Wandlung
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80 | //----------------------------------------------------------------------------//
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81 | // Dummy-Readout
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82 | ADCSRA = (1<<ADEN) | (1<<ADPS2) | (1<<ADPS1); // ADC aktivieren, Frequenzvorteiler: setzen auf 64 (8 MHz / 64 = 125 kHz) und ADC aktivieren
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83 | ADMUX = 0x00; // Kanal waehlen (ADC0)
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84 | ADMUX |= (1<<REFS0) | (1<<REFS1); // interne Referenzspannung nutzen
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85 | ADCSRA |= (1<<ADSC); // eine ADC-Wandlung
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86 | while(!(ADCSRA & (1<<ADIF))); // auf Abschluss der Konvertierung warten (ADIF-bit)
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87 | result = ADC; // ADC muss einmal gelesen werden,
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88 | // sonst wird Ergebnis der nächsten Wandlung
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89 | // nicht übernommen.
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90 |
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91 | //ADC-Messung mit arithmetischen Mittel aus 4 Messungen
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92 | result = 0;
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93 | for (i=0;i<4;i++)
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94 | {
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95 | ADCSRA |= (1<<ADSC); // Messung ausfuehren
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96 | while ( ADCSRA & (1<<ADSC) ); // Konvertierung abwarten
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97 | result += ADC; // aufaddieren zur Mittelwertbildung (ADC auslesen der zwei Bits
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98 | }
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99 | ADCSRA &= ~(1<<ADEN); // ADC ausschalten
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100 |
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101 | result /= 16; // Mittelwert aus 4 und 8Bit für PWM (1024 / 4 = 256)
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102 |
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103 | OCR0A = result; // OC0A (PD6) = Poti-wert
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104 | OCR0B = result; // OC0B (PD5) = Poti-wert
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105 |
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106 |
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107 | //----------------------------------------------------------------------------//
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108 | // AD-Abfrage zur Prüfung auf Funktion - Komentare sind für ein anders Projekt
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109 | //----------------------------------------------------------------------------//
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110 | if (result < 63) //410 = 5,4V
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111 | {
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112 | PORTD &= ~0x15; // PD4, PD2 &PD0 low
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113 | PORTD |= 0x08; // PD3 high => LED an
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114 | }
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115 | if ((result < 127) & (result >= 63)) //430 = 5,7V
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116 | {
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117 | PORTD &= ~0x0D; // PD3, PD2 & PD0 low
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118 | PORTD |= 0x10; // PD4 high => LED an
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119 | }
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120 | if ((result < 191) & (result >= 127)) //915 = 10,8V, 975 = 11,5V bei 100K und 330R
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121 | {
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122 | PORTD &= ~0x1c; // PD4, PD3 & PD2 low
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123 | PORTD |= 0x01; // PD0 high => LED an
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124 | }
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125 | if (result >= 191)
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126 | {
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127 | PORTD &= ~0x19; // PD4, PD3 & PD0 low
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128 | PORTD |= 0x04; // PD2 high => LED an
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129 | }
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130 |
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131 | }
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132 | ////////////////////////////////////////////////////////////////////////////////
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133 | // Hauptprogramm
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134 | ////////////////////////////////////////////////////////////////////////////////
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135 | void main(void)
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136 | {
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137 | //stop errant interrupts until set up
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138 | CLI(); //disable all interrupts
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139 | port_init();
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140 | timer0_init();
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141 | timer1_init();
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142 | adc_init();
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143 |
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144 |
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145 | MCUCR = 0x00;
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146 | EICRA = 0x00; //extended ext ints
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147 | EIMSK = 0x00;
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148 |
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149 | TIMSK0 = 0x01; //timer 0 interrupt sources
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150 | TIMSK1 = 0x01; //timer 1 interrupt sources
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151 | TIMSK2 = 0x00; //timer 2 interrupt sources
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152 |
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153 | PCMSK0 = 0x00; //pin change mask 0
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154 | PCMSK1 = 0x00; //pin change mask 1
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155 | PCMSK2 = 0x00; //pin change mask 2
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156 | PCICR = 0x00; //pin change enable
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157 | PRR = 0x00; //power controller
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158 | SEI(); //re-enable interrupts
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159 | //all peripherals are now initialized
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160 |
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161 | while(1);
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162 | // Endlosschleife, blinken läuft im 100ms Interrupt
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163 |
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164 |
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165 | }
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