uc: increase sampling rate to 625Hz on ADC0 and ADC1. Use CTC for finetuning frequency.
This commit is contained in:
Bart Van Der Meerssche
parent
03eee97e37
commit
24d8104aac
11
uc/Makefile
11
uc/Makefile
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@ -81,19 +81,20 @@ AVRDUDE_PROGRAMMER = usbtiny
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MCU = atmega48
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F_CPU = 1000000
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#
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# Predefine the TYPE and SENSORx C macros in main.h via this Makefile. Override the
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# defaults on the command line by typing:
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# Predefine the TYPE and SENSORx C macros in main.h via this Makefile.
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# Override the defaults on the command line by typing:
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# make TYPE=xxxx SENSOR0=yyyy ...
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#
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TYPE = 2301
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METERCONST = 7091
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DBG = 0
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#
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TYPE = 2300501
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#
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SENSOR0 = 0123456789abcdef0123456789abcde0
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SENSOR1 = 0123456789abcdef0123456789abcde1
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SENSOR2 = 0123456789abcdef0123456789abcde2
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SENSOR3 = 0123456789abcdef0123456789abcde3
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#
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CEXTRA = -D TYPE=$(TYPE) -D METERCONST=$(METERCONST) -D POWERCONST=$(POWERCONST) -D 'SENSOR0="$(SENSOR0)"' -D 'SENSOR1="$(SENSOR1)"' -D 'SENSOR2="$(SENSOR2)"' -D 'SENSOR3="$(SENSOR3)"'
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CEXTRA = -D DBG=$(DBG) -D TYPE=$(TYPE) -D 'SENSOR0="$(SENSOR0)"' -D 'SENSOR1="$(SENSOR1)"' -D 'SENSOR2="$(SENSOR2)"' -D 'SENSOR3="$(SENSOR3)"'
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#####################################################################################
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#####################################################################################
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86
uc/main.c
86
uc/main.c
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@ -73,43 +73,49 @@ ISR(PCINT2_vect) {
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**/
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// interrupt service routine for ADC
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ISR(TIMER2_OVF_vect) {
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ISR(TIMER2_COMPA_vect) {
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#if DBG > 0
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PORTD |= (1<<PD4);
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#endif
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// read ADC result
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// add to nano(Wh) counter
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if (muxn < 2) {
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MacU16X16to32(aux[muxn].nano, METERCONST, ADC);
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MacU16X16to32(aux[muxn].nano, METERCONST, ADC);
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if (aux[muxn].nano > WATT) {
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measurements[muxn].value++;
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aux[muxn].pulse = true;
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aux[muxn].nano -= WATT;
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aux[muxn].pulse_count++;
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}
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if (timer == SECOND) {
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aux[muxn].nano_start = aux[muxn].nano_end;
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aux[muxn].nano_end = aux[muxn].nano;
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aux[muxn].pulse_count_final = aux[muxn].pulse_count;
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aux[muxn].pulse_count = 0;
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aux[muxn].power = true;
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}
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if (aux[muxn].nano > WATT) {
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measurements[muxn].value++;
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aux[muxn].pulse = true;
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aux[muxn].nano -= WATT;
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aux[muxn].pulse_count++;
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}
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// rotate the available ADC input channels (0 to 7)
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if (timer == SECOND) {
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aux[muxn].nano_start = aux[muxn].nano_end;
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aux[muxn].nano_end = aux[muxn].nano;
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aux[muxn].pulse_count_final = aux[muxn].pulse_count;
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aux[muxn].pulse_count = 0;
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aux[muxn].power = true;
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}
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// cycle through the available ADC input channels (0 and 1)
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muxn++;
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if (!(muxn &= 0x7)) timer++;
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if (!(muxn &= 0x1)) timer++;
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if (timer > SECOND) timer = 0;
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// but only use ADC0 and 1
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if (muxn < 2) {
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ADMUX &= 0xF8;
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ADMUX |= muxn;
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// start a new ADC conversion
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ADCSRA |= (1<<ADSC);
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}
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}
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ADMUX &= 0xF8;
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ADMUX |= muxn;
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// start a new ADC conversion
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ADCSRA |= (1<<ADSC);
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#if DBG > 0
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PORTD &= ~(1<<PD4);
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#endif
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#if DBG > 1
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aux[muxn].nano = WATT+1;
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timer = SECOND;
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#endif
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}
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// interrupt service routine for analog comparator
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ISR(ANALOG_COMP_vect) {
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uint8_t i;
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@ -197,7 +203,10 @@ void setup()
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// enable INT0 and INT1 interrupts
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EIMSK = (1<<INT0) | (1<<INT1);
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#if DBG > 0
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// re-use PD4 pin for tracing interrupt times
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DDRD |= (1<<DDD4);
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#else
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// PD4=PCINT20 configuration
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// set as input pin with 20k pull-up enabled
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PORTD |= (1<<PD4);
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@ -205,6 +214,7 @@ void setup()
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PCMSK2 |= (1<<PCINT20);
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//pin change interrupt enable 2
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PCICR |= (1<<PCIE2);
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#endif
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// analog comparator setup for brown-out detection
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// PD7=AIN1 configured by default as input to obtain high impedance
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@ -216,10 +226,20 @@ void setup()
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// bandgap select | AC interrupt enable | AC interrupt on rising edge (DS p.243)
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ACSR |= (1<<ACBG) | (1<<ACIE) | (1<<ACIS1) | (1<<ACIS0);
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// Timer2 normal operation
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// Timer2 clock prescaler set to 1 => fTOV2 = 1000kHz / 256 / 1 = 3906.24Hz (DS p.158)
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TCCR2B |= (1<<CS20);
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TIMSK2 |= (1<<TOIE2);
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// Timer2 set to CTC mode (DS p.146, 154, 157)
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TCCR2A |= 1<<WGM21;
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#if DBG > 0
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// Toogle pin OC2A=PB3 on compare match
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TCCR2A |= 1<<COM2A0;
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#endif
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// Set PB3 as output pin
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DDRB |= (1<<DDB3);
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// Timer2 clock prescaler set to 8 => fTOV2 = 1000kHz / 256 / 8 = 488.28Hz (DS p.158)
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TCCR2B |= (1<<CS21);
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// Enable output compare match interrupt for timer2 (DS p.159)
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TIMSK2 |= (1<<OCIE2A);
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// Increase sampling frequency to 1250Hz (= 625Hz per channel)
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OCR2A = 0x63;
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// disable digital input cicuitry on ADCx pins to reduce leakage current
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DIDR0 |= (1<<ADC5D) | (1<<ADC4D) | (1<<ADC3D) | (1<<ADC2D) | (1<<ADC1D) | (1<<ADC0D);
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42
uc/main.h
42
uc/main.h
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@ -24,7 +24,7 @@
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# define POWER 1
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# define WATT 1000000000
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# define SECOND 487 // rounded down from 488.28125 - 1
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# define SECOND 624 // 625Hz - 1
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#ifndef SENSOR0
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#define SENSOR0 "0123456789abcdef0123456789abcde0"
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@ -43,33 +43,33 @@
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#endif
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#ifndef TYPE
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#define TYPE 2301
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#define TYPE 2300501
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#endif
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#ifndef METERCONST
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#if TYPE == 2201 // 220V - 1-phase @ 488.28Hz sampling rate
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#define METERCONST 6783
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#warning "220V - 1-phase selected. METERCONST set to 6783"
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#ifndef METERCONST // @ 625Hz sampling rate
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#if TYPE == 2200501
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#define METERCONST 5299
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#warning "220V - 50A - 1-phase selected. METERCONST set to 5299"
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#elif TYPE == 2203 // 220V - 3-phase @ 488.28Hz sampling rate
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#define METERCONST 6721
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#warning "220V - 3-phase selected. METERCONST set to 6721"
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#elif TYPE == 2200503
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#define METERCONST 5251
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#warning "220V - 50A - 3-phase selected. METERCONST set to 5251"
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#elif TYPE == 2301 // 230V - 1-phase @ 488.28Hz sampling rate
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#define METERCONST 7091
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#warning "230V - 1-phase selected. METERCONST set to 7091"
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#elif TYPE == 2300501
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#define METERCONST 5540
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#warning "230V - 50A - 1-phase selected. METERCONST set to 5540"
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#elif TYPE == 2303 // 230V - 3-phase @ 488.28Hz sampling rate
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#define METERCONST 7026
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#warning "230V - 3-phase selected. METERCONST set to 7026"
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#elif TYPE == 2300503
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#define METERCONST 5489
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#warning "230V - 50A - 3-phase selected. METERCONST set to 5489"
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#elif TYPE == 2401 // 240V - 1-phase @ 488.28Hz sampling rate
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#define METERCONST 7399
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#warning "240V - 1-phase selected. METERCONST set to 7399"
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#elif TYPE == 2400501
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#define METERCONST 5780
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#warning "240V - 50A - 1-phase selected. METERCONST set to 5780"
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#elif TYPE == 2403 // 240V - 3-phase @ 488.28Hz sampling rate
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#define METERCONST 7331
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#warning "240V - 3-phase selected. METERCONST set to 7331"
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#elif TYPE == 2400503
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#define METERCONST 5727
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#warning "240V - 50A - 3-phase selected. METERCONST set to 5727"
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#endif
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#endif
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