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scan ADC pins with id array

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This commit is contained in:
Harald Barth 2022-11-23 23:20:23 +01:00
parent e1ec63464c
commit 3e4d6863bb
2 changed files with 35 additions and 42 deletions
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2
DCCTimer.h
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@ -124,6 +124,8 @@ private:
static uint16_t usedpins;
// cached analog values (malloc:ed to actual number of ADC channels)
static int *analogvals;
// ids to scan (new way)
static byte *idarr;
// friend so that we can call scan() and begin()
friend class DCCWaveform;
};

75
DCCTimerAVR.cpp
View File

@ -120,12 +120,13 @@ 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;
int * ADCee::analogvals = NULL;
byte *ADCee::idarr = NULL;
bool ADCusesHighPort = false;
/*
@ -135,16 +136,26 @@ bool ADCusesHighPort = false;
*/
int ADCee::init(uint8_t pin) {
uint8_t id = pin - A0;
if (id > NUM_ADC_INPUTS)
byte n;
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));
if (analogvals == NULL) {
analogvals = (int *)calloc(NUM_ADC_INPUTS, sizeof(int));
idarr = (byte *)calloc(NUM_ADC_INPUTS+1, sizeof(byte));
for (n=0 ; n <= NUM_ADC_INPUTS; n++)
idarr[n] = 255;
}
for (n=0 ; n <= NUM_ADC_INPUTS; n++) {
if (idarr[n] == 255) {
idarr[n] = id;
break;
}
}
analogvals[id] = value;
usedpins |= (1<<id);
return value;
}
int16_t ADCee::ADCmax() {
@ -168,8 +179,7 @@ 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 num = 0; // index into id array
static bool waiting = false;
if (waiting) {
@ -181,45 +191,26 @@ void ADCee::scan() {
low = ADCL; //must read low before high
high = ADCH;
bitSet(ADCSRA, ADIF);
analogvals[id] = (high << 8) | low;
// advance at least one track
// for scope debug TrackManager::track[1]->setBrake(0);
analogvals[idarr[num]] = (high << 8) | low;
waiting = false;
id++;
mask = mask << 1;
if (id == NUM_ADC_INPUTS+1) {
id = 0;
mask = 1;
}
}
if (!waiting) {
if (usedpins == 0) // otherwise we would loop forever
return;
// look for a valid track to sample or until we are around
while (true) {
if (mask & usedpins) {
// start new ADC aquire on id
// cycle around in-use analogue pins
num++;
if (idarr[num] == 255)
num = 0;
// start new ADC aquire on id
#if defined(ADCSRB) && defined(MUX5)
if (ADCusesHighPort) { // if we ever have started to use high pins)
if (id > 7) // if we use a high ADC pin
bitSet(ADCSRB, MUX5); // set MUX5 bit
else
bitClear(ADCSRB, MUX5);
}
#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);
waiting = true;
return;
}
id++;
mask = mask << 1;
if (id == NUM_ADC_INPUTS+1) {
id = 0;
mask = 1;
}
if (ADCusesHighPort) { // if we ever have started to use high pins)
if (idarr[num] > 7) // if we use a high ADC pin
bitSet(ADCSRB, MUX5); // set MUX5 bit
else
bitClear(ADCSRB, MUX5);
}
#endif
ADMUX = (1 << REFS0) | (idarr[num] & 0x07); // select AVCC as reference and set MUX
bitSet(ADCSRA, ADSC); // start conversion
waiting = true;
}
}
#pragma GCC pop_options