119 lines
5.7 KiB
C++
119 lines
5.7 KiB
C++
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#if defined(CORE_AVR)
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#include "globals.h"
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#include "auxiliaries.h"
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void initBoard()
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{
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/*
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***********************************************************************************************************
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* General
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*/
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configPage9.intcan_available = 0; // AVR devices do NOT have internal canbus
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/*
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***********************************************************************************************************
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* Auxilliaries
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*/
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//PWM used by the Boost and VVT outputs
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TCCR1B = 0x00; //Disbale Timer1 while we set it up
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TCNT1 = 0; //Reset Timer Count
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TIFR1 = 0x00; //Timer1 INT Flag Reg: Clear Timer Overflow Flag
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TCCR1A = 0x00; //Timer1 Control Reg A: Wave Gen Mode normal (Simply counts up from 0 to 65535 (16-bit int)
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TCCR1B = (1 << CS12); //Timer1 Control Reg B: Timer Prescaler set to 256. 1 tick = 16uS. Refer to http://www.instructables.com/files/orig/F3T/TIKL/H3WSA4V7/F3TTIKLH3WSA4V7.jpg
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boost_pwm_max_count = 1000000L / (16 * configPage6.boostFreq * 2); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle. The x2 is there because the frequency is stored at half value (in a byte) to allow freqneucies up to 511Hz
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vvt_pwm_max_count = 1000000L / (16 * configPage6.vvtFreq * 2); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle
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/*
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***********************************************************************************************************
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* Timers
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*/
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//Configure Timer2 for our low-freq interrupt code.
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TCCR2B = 0x00; //Disbale Timer2 while we set it up
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TCNT2 = 131; //Preload timer2 with 131 cycles, leaving 125 till overflow. As the timer runs at 125Khz, this causes overflow to occur at 1Khz = 1ms
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TIFR2 = 0x00; //Timer2 INT Flag Reg: Clear Timer Overflow Flag
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TIMSK2 = 0x01; //Timer2 Set Overflow Interrupt enabled.
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TCCR2A = 0x00; //Timer2 Control Reg A: Wave Gen Mode normal
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/* Now configure the prescaler to CPU clock divided by 128 = 125Khz */
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TCCR2B |= (1<<CS22) | (1<<CS20); // Set bits
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TCCR2B &= ~(1<<CS21); // Clear bit
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//Enable the watchdog timer for 2 second resets (Good reference: https://tushev.org/articles/arduino/5/arduino-and-watchdog-timer)
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//Boooooooooo WDT is currently broken on Mega 2560 bootloaders :(
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//wdt_enable(WDTO_2S);
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/*
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***********************************************************************************************************
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* Schedules
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* */
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//Much help in this from http://arduinomega.blogspot.com.au/2011/05/timer2-and-overflow-interrupt-lets-get.html
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//Fuel Schedules, which uses timer 3
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TCCR3B = 0x00; //Disable Timer3 while we set it up
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TCNT3 = 0; //Reset Timer Count
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TIFR3 = 0x00; //Timer3 INT Flag Reg: Clear Timer Overflow Flag
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TCCR3A = 0x00; //Timer3 Control Reg A: Wave Gen Mode normal
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TCCR3B = (1 << CS12); //Timer3 Control Reg B: Timer Prescaler set to 256. Refer to http://www.instructables.com/files/orig/F3T/TIKL/H3WSA4V7/F3TTIKLH3WSA4V7.jpg
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//TCCR3B = 0x03; //Timer3 Control Reg B: Timer Prescaler set to 64. Refer to http://www.instructables.com/files/orig/F3T/TIKL/H3WSA4V7/F3TTIKLH3WSA4V7.jpg
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//Ignition Schedules, which uses timer 5. This is also used by the fast version of micros(). If the speed of this timer is changed from 4uS ticks, that MUST be changed as well. See globals.h and timers.ino
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TCCR5B = 0x00; //Disable Timer5 while we set it up
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TCNT5 = 0; //Reset Timer Count
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//TIFR5 = 0x00; //Timer5 INT Flag Reg: Clear Timer Overflow Flag
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//TIFR5 = 0xFF;
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TCCR5A = 0x00; //Timer5 Control Reg A: Wave Gen Mode normal
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//TCCR5B = (1 << CS12); //Timer5 Control Reg B: Timer Prescaler set to 256. Refer to http://www.instructables.com/files/orig/F3T/TIKL/H3WSA4V7/F3TTIKLH3WSA4V7.jpg
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//TCCR5B = 0x03; //aka Divisor = 64 = 490.1Hz
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TCCR5B = (1 << CS11) | (1 << CS10); //Timer5 Control Reg B: Timer Prescaler set to 64. Refer to http://www.instructables.com/files/orig/F3T/TIKL/H3WSA4V7/F3TTIKLH3WSA4V7.jpg
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TIFR5 |= (1 << OCF5A) | (1<<OCF5B) | (1<<OCF5C);
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//0xFF;
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#if defined(TIMER5_MICROS)
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TIMSK5 |= (1 << TOIE5); //Enable the timer5 overflow interrupt (See timers.ino for ISR)
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TIMSK0 &= ~_BV(TOIE0); // disable timer0 overflow interrupt
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#endif
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//The remaining Schedules (Schedules 4 for fuel and ignition) use Timer4
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TCCR4B = 0x00; //Disable Timer4 while we set it up
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TCNT4 = 0; //Reset Timer Count
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TIFR4 = 0x00; //Timer4 INT Flag Reg: Clear Timer Overflow Flag
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TCCR4A = 0x00; //Timer4 Control Reg A: Wave Gen Mode normal
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TCCR4B = (1 << CS12); //Timer4 Control Reg B: aka Divisor = 256 = 122.5HzTimer Prescaler set to 256. Refer to http://www.instructables.com/files/orig/F3T/TIKL/H3WSA4V7/F3TTIKLH3WSA4V7.jpg
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}
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uint16_t freeRam()
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{
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extern int __heap_start, *__brkval;
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int currentVal;
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uint16_t v;
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if(__brkval == 0) { currentVal = (int) &__heap_start; }
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else { currentVal = (int) __brkval; }
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//Old version:
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//return (uint16_t) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
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return (uint16_t) &v - currentVal; //cppcheck-suppress misra-c2012-11.4
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}
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#if defined(TIMER5_MICROS)
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//This is used by the fast version of micros(). We just need to increment the timer overflow counter
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ISR(TIMER5_OVF_vect)
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{
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++timer5_overflow_count;
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}
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static inline unsigned long micros_safe()
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{
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unsigned long newMicros;
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noInterrupts();
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newMicros = (((timer5_overflow_count << 16) + TCNT5) * 4);
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interrupts();
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return newMicros;
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}
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#endif //TIMER5_MICROS
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#endif //CORE_AVR
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