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variable frequency step #1

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This commit is contained in:
Harald Barth
2023-12-30 21:23:44 +01:00
parent bd44184f57
commit adb8b56c92
5 changed files with 115 additions and 81 deletions
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71
DCCTimerAVR.cpp
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@@ -29,6 +29,7 @@
#include <avr/boot.h>
#include <avr/wdt.h>
#include "DCCTimer.h"
#include "DIAG.h"
#ifdef DEBUG_ADC
#include "TrackManager.h"
#endif
@@ -125,6 +126,76 @@ void DCCTimer::reset() {
}
void DCCTimer::DCCEXanalogWriteFrequency(uint8_t pin, uint32_t f) {
DCCTimer::DCCEXanalogWriteFrequencyInternal(pin, f);
}
void DCCTimer::DCCEXanalogWriteFrequencyInternal(uint8_t pin, uint32_t fbits) {
#if defined(ARDUINO_AVR_UNO)
// Not worth doin something here as:
// If we are on pin 9 or 10 we are on Timer1 and we can not touch Timer1 as that is our DCC source.
// If we are on pin 5 or 6 we are on Timer 0 ad we can not touch Timer0 as that is millis() etc.
// We are most likely not on pin 3 or 11 as no known motor shield has that as brake.
#endif
#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560)
uint8_t abits;
uint8_t bbits;
if (pin == 9 || pin == 10) { // timer 2 is different
if (fbits >= 3)
abits = B11;
else
abits = B01;
if (fbits >= 3)
bbits = B0001;
else if (fbits == 2)
bbits = B0010;
else if (fbits == 1)
bbits = B0100;
else
bbits = B0110;
TCCR2A = (TCCR2A & B11111100) | abits; // set WGM0 and WGM1
TCCR2B = (TCCR2B & B11110000) | bbits; // set WGM2 and 3 bits of prescaler
DIAG(F("Timer 2 A=%x B=%x"), TCCR2A, TCCR2B);
} else { // not timer 9 or 10
abits = B01;
if (fbits >= 3)
bbits = B1001;
else if (fbits == 2)
bbits = B0010;
else if (fbits == 1)
bbits = B0011;
else
bbits = B0100;
switch (pin) {
// case 9 and 10 taken care of above by if()
case 6:
case 7:
case 8:
// Timer4
TCCR4A = (TCCR4A & B11111100) | abits; // set WGM0 and WGM1
TCCR4B = (TCCR4B & B11100000) | bbits; // set WGM2 and WGM3 and divisor
DIAG(F("Timer 4 A=%x B=%x"), TCCR4A, TCCR4B);
break;
case 46:
case 45:
case 44:
// Timer5
TCCR5A = (TCCR5A & B11111100) | abits; // set WGM0 and WGM1
TCCR5B = (TCCR5B & B11100000) | bbits; // set WGM2 and WGM3 and divisor
DIAG(F("Timer 5 A=%x B=%x"), TCCR5A, TCCR5B);
break;
default:
break;
}
}
#endif
}
#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560)
#define NUM_ADC_INPUTS 16
#else