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CommandStation-EX
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Optimize DCCTimerARV.cpp

This commit is contained in:
Harald Barth 2023-06-19 00:06:04 +02:00
parent 7783837545
commit 56fcb4e5f7
2 changed files with 26 additions and 14 deletions
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1
DCCTimer.h
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@ -127,6 +127,7 @@ private:
static void scan();
// bit array of used pins (max 16)
static uint16_t usedpins;
static uint8_t highestPin;
// cached analog values (malloc:ed to actual number of ADC channels)
static int *analogvals;
// friend so that we can call scan() and begin()

39
DCCTimerAVR.cpp
View File

@ -1,6 +1,6 @@
/*
* © 2021 Mike S
* © 2021-2022 Harald Barth
* © 2021-2023 Harald Barth
* © 2021 Fred Decker
* © 2021 Chris Harlow
* © 2021 David Cutting
@ -29,6 +29,9 @@
#include <avr/boot.h>
#include <avr/wdt.h>
#include "DCCTimer.h"
#ifdef DEBUG_ADC
#include "TrackManager.h"
#endif
INTERRUPT_CALLBACK interruptHandler=0;
// Arduino nano, uno, mega etc
@ -123,13 +126,14 @@ void DCCTimer::reset() {
}
#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560)
#define NUM_ADC_INPUTS 15
#define NUM_ADC_INPUTS 16
#else
#define NUM_ADC_INPUTS 7
#define NUM_ADC_INPUTS 8
#endif
uint16_t ADCee::usedpins = 0;
uint8_t ADCee::highestPin = 0;
int * ADCee::analogvals = NULL;
bool ADCusesHighPort = false;
static bool ADCusesHighPort = false;
/*
* Register a new pin to be scanned
@ -138,16 +142,17 @@ bool ADCusesHighPort = false;
*/
int ADCee::init(uint8_t pin) {
uint8_t id = pin - A0;
if (id > NUM_ADC_INPUTS)
if (id >= NUM_ADC_INPUTS)
return -1023;
if (id > 7)
ADCusesHighPort = true;
pinMode(pin, INPUT);
int value = analogRead(pin);
if (analogvals == NULL)
analogvals = (int *)calloc(NUM_ADC_INPUTS+1, sizeof(int));
analogvals = (int *)calloc(NUM_ADC_INPUTS, sizeof(int));
analogvals[id] = value;
usedpins |= (1<<id);
if (id > highestPin) highestPin = id;
return value;
}
int16_t ADCee::ADCmax() {
@ -157,13 +162,15 @@ int16_t ADCee::ADCmax() {
* Read function ADCee::read(pin) to get value instead of analogRead(pin)
*/
int ADCee::read(uint8_t pin, bool fromISR) {
(void)fromISR; // AVR does ignore this arg
uint8_t id = pin - A0;
if ((usedpins & (1<<id) ) == 0)
return -1023;
// we do not need to check (analogvals == NULL)
// because usedpins would still be 0 in that case
return analogvals[id];
if (!fromISR) noInterrupts();
int a = analogvals[id];
if (!fromISR) interrupts();
return a;
}
/*
* Scan function that is called from interrupt
@ -171,8 +178,8 @@ int ADCee::read(uint8_t pin, bool fromISR) {
#pragma GCC push_options
#pragma GCC optimize ("-O3")
void ADCee::scan() {
static byte id = 0; // id and mask are the same thing but it is faster to
static uint16_t mask = 1; // increment and shift instead to calculate mask from id
static byte id = 0; // id and mask are the same thing but it is faster to
static uint16_t mask = 1; // increment and shift instead to calculate mask from id
static bool waiting = false;
if (waiting) {
@ -186,11 +193,13 @@ void ADCee::scan() {
bitSet(ADCSRA, ADIF);
analogvals[id] = (high << 8) | low;
// advance at least one track
// for scope debug TrackManager::track[1]->setBrake(0);
#ifdef DEBUG_ADC
if (id == 1) TrackManager::track[1]->setBrake(0);
#endif
waiting = false;
id++;
mask = mask << 1;
if (id == NUM_ADC_INPUTS+1) {
if (id > highestPin) { // the 1 has been shifted out
id = 0;
mask = 1;
}
@ -212,13 +221,15 @@ void ADCee::scan() {
#endif
ADMUX=(1<<REFS0)|(id & 0x07); //select AVCC as reference and set MUX
bitSet(ADCSRA,ADSC); // start conversion
// for scope debug TrackManager::track[1]->setBrake(1);
#ifdef DEBUG_ADC
if (id == 1) TrackManager::track[1]->setBrake(1);
#endif
waiting = true;
return;
}
id++;
mask = mask << 1;
if (id == NUM_ADC_INPUTS+1) {
if (id > highestPin) {
id = 0;
mask = 1;
}