src/Timer8.h

   1 #ifndef AVR_TIMER8_H
   2 #define AVR_TIMER8_H
   3
   4 #include "Types.h"
   5 #include "Hardware.h"
   6
   7 #define MAX_OUTPUTCOMPARE8_UNITS 3
   8
   9 namespace avr {
  10
  11         /**
  12          * @author Tom Haber
  13          * @date May 29, 2008
  14          * @brief 8-bit Output Compare Unit
  15          *
  16          * 8-bit Output Compare Unit
  17          */
  18         class OutputCompareUnit8 {
  19                 public:
  20                         OutputCompareUnit8() : ocfmask(0), ocr(0) {}
  21
  22                 public:
  23                         void setOcrRegister(IORegister *ocr) { this->ocr = ocr; }
  24                         bool ocrSet() const { return ocr != 0; }
  25                         void setMask(unsigned char ocfmask) { this->ocfmask = ocfmask; }
  26                         void setCompareMode(unsigned char cm) { this->compareMode = cm; }
  27                         void regChanged(IORegister *reg);
  28
  29                 public:
  30                         bool compare(unsigned char tcnt) const { return tcnt == ocrBuf; }
  31                         void flush();
  32                         unsigned char value() const { return ocrBuf; }
  33                         void forceOutputCompare(IORegister *tifr, unsigned char tcnt);
  34                         void compareMatchOutput(IORegister *tifr, unsigned char tcnt);
  35
  36                 private:
  37                         // For double buffering ocr register
  38                         unsigned char ocrBuf;
  39                         unsigned char compareMode;
  40                         unsigned char ocfmask;
  41
  42                 private:
  43                         IORegister *ocr;
  44         };
  45
  46         /**
  47          * @author Tom Haber
  48          * @date May 2, 2008
  49          * @brief 8-bit timers
  50          *
  51          * 8-bit timers
  52          */
  53         class Timer8 : public Hardware {
  54                 public:
  55                         Timer8(Bus & bus, unsigned char tovmask, int compunits,
  56                                         unsigned char ocfmask[]);
  57
  58                 public:
  59                         bool attachReg(const char *name, IORegister *reg);
  60                         bool finishBuild();
  61                         void regChanged( IORegister *reg );
  62                         void step();
  63
  64                 private:
  65                         void setClock(unsigned char tccr);
  66                         void flushOCRn();
  67
  68                 private:
  69                         unsigned char tovmask;
  70                         int direction;
  71
  72                         /* pg. 93 of manual. Block compareMatch for one period after
  73                      * TCNTn is written to. */
  74                     bool blockCompareMatch;
  75
  76                         unsigned char timerMode;
  77                         int period;
  78
  79                 private:
  80                         IORegister *tcnt;
  81                         IORegister *tccr;
  82                         IORegister *tifr;
  83
  84                         int nUnits;
  85                         OutputCompareUnit8 units[MAX_OUTPUTCOMPARE8_UNITS];
  86         };
  87
  88 }
  89
  90 #endif /*AVR_TIMER8_H*/