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sys.cpp
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/*
* sys.cpp
*
* Created: 02-10-2018 13:07:52
* Author: JMR_2
*/
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/power.h>
#include <util/delay.h>
#include "sys.h"
#include "UPDI_lo_lvl.h"
#include "dbg.h"
#include <stdio.h>
#include <string.h>
#include <stdio.h>
#include <string.h>
void SYS::init(void) {
#ifdef DEBUG_ON
DBG::initDebug();
#endif
#ifdef XAVR
#ifdef __AVR_DA__
#if (F_CPU == 24000000)
/* No division on clock */
_PROTECTED_WRITE(CLKCTRL_OSCHFCTRLA, (CLKCTRL_OSCHFCTRLA & ~CLKCTRL_FREQSEL_gm ) | (0x09<< CLKCTRL_FREQSEL_gp ));
#elif (F_CPU == 20000000)
/* No division on clock */
_PROTECTED_WRITE(CLKCTRL_OSCHFCTRLA, (CLKCTRL_OSCHFCTRLA & ~CLKCTRL_FREQSEL_gm ) | (0x08<< CLKCTRL_FREQSEL_gp ));
#elif (F_CPU == 16000000)
/* No division on clock */
_PROTECTED_WRITE(CLKCTRL_OSCHFCTRLA, (CLKCTRL_OSCHFCTRLA & ~CLKCTRL_FREQSEL_gm ) | (0x07<< CLKCTRL_FREQSEL_gp ));
#else
#error "F_CPU defined as an unsupported value"
#endif
#else //0-series or 1-series
_PROTECTED_WRITE(CLKCTRL.MCLKCTRLB, 0);
#endif
#else
#if defined(ARDUINO_AVR_LARDU_328E)
#include <avr/power.h>
clock_prescale_set ( (clock_div_t) __builtin_log2(32000000UL / F_CPU));
#endif
PORT(UPDI_PORT) = 1<<UPDI_PIN;
#endif
DDR(LED_PORT) |= (1 << LED_PIN);
#ifdef LED2_PORT
DDR(LED2_PORT) |= (1 << LED2_PIN);
#endif
#ifndef DISABLE_HOST_TIMEOUT
TIMER_HOST_MAX=HOST_TIMEOUT;
#endif
#ifndef DISABLE_TARGET_TIMEOUT
TIMER_TARGET_MAX=TARGET_TIMEOUT;
#endif
#if defined(DEBUG_ON)
DBG::debug(0x18,0xC0,0xFF, 0xEE);
#endif
#if defined(__AVR_ATmega328P__)
// all programming
PORTD |= 0b00111100; // pullup Arduino pins D2-5
// standard programming only
#if not defined (USE_HV_PROGRAMMING)
PORTB |= 0b00011111; // pullup Arduino pins D8-12
PORTC |= 0b00111111; // pullup Arduino pins A0-5
#else // hv programming only
// Dickson charge pump - Bit 4,3,2,1,0: HVPWR4 Power, HVSD3 Shutdown, HVCP2 Clock, HVCP1 Clock, HVLED
DDRB |= 0b00011111; // configure HVPWR4, HVSD3, HVCP2, HVCP1, HVLED as outputs
PORTB &= ~0b00011110; // clear HVPWR4, HVSD3, HVCP2, HVCP1
PORTB |= 0b00001000; // set HVSD3
#endif
#elif defined(__AVR_ATmega_Mega__)
// all programming
// for working with spare pins common to HV and standard programmers
// standard programming only
#if not defined (USE_HV_PROGRAMMING)
// for working with spare pins on standard programmers that are only used for HV type
#else // hv programming only
// Dickson charge pump - Bit 4,3,2,1,0: HVPWR4 Power, HVSD3 Shutdown, HVCP2 Clock, HVCP1 Clock, HVLED
DDRK |= 0b00011111; // configure HVPWR4, HVSD3, HVCP2, HVCP1, HVLED as outputs
PORTK &= ~0b00011110; // clear HVPWR4, HVSD3, HVCP2, HVCP1
PORTK |= 0b00001000; // set HVSD3
#endif
#elif defined(__AVR_ATtiny_Zero_One__)
// all programming
#if defined(__AVR_ATtinyxy6__) || defined(__AVR_ATtinyxy7__)
PORTB.PIN4CTRL = PORT_PULLUPEN_bm;
PORTB.PIN5CTRL = PORT_PULLUPEN_bm;
PORTC.PIN0CTRL = PORT_PULLUPEN_bm;
PORTC.PIN1CTRL = PORT_PULLUPEN_bm;
PORTC.PIN2CTRL = PORT_PULLUPEN_bm;
PORTC.PIN3CTRL = PORT_PULLUPEN_bm;
#elif defined(__AVR_ATtinyxy7__)
PORTB.PIN6CTRL = PORT_PULLUPEN_bm;
PORTB.PIN7CTRL = PORT_PULLUPEN_bm;
PORTC.PIN4CTRL = PORT_PULLUPEN_bm;
PORTC.PIN5CTRL = PORT_PULLUPEN_bm;
#endif
// standard programming only
#if not defined (USE_HV_PROGRAMMING)
PORTA.PIN1CTRL = PORT_PULLUPEN_bm;
PORTA.PIN2CTRL = PORT_PULLUPEN_bm;
PORTA.PIN3CTRL = PORT_PULLUPEN_bm;
PORTA.PIN4CTRL = PORT_PULLUPEN_bm;
PORTA.PIN5CTRL = PORT_PULLUPEN_bm;
PORTB.PIN1CTRL = PORT_PULLUPEN_bm;
#else // hv programming only
// Output Pins
PORTA.DIRSET = PIN2_bm | cpp | PIN6_bm | PIN7_bm; // Power Switch, ChargePumpPower-HVenable, LED2-HVLED, LED
PORTA.OUTSET = PIN2_bm; // enable power switch
PORTA.DIRSET = cp1 | cp2; // set charge pump clock1 and clock2 as output
PORTB.DIRSET = cps; // set charge pump shutdown pin as output
PORTB.OUTSET = cps; // enable charge pump shutdown
#endif
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
// all programming (28 pins or more)
PORTA.PIN4CTRL = PORT_PULLUPEN_bm;
PORTA.PIN5CTRL = PORT_PULLUPEN_bm;
PORTF.PIN0CTRL = PORT_PULLUPEN_bm;
PORTF.PIN1CTRL = PORT_PULLUPEN_bm;
#if defined(__AVR_32PIN__) || defined(__AVR_48PIN__) || defined(__AVR_64PIN__)
PORTF.PIN2CTRL = PORT_PULLUPEN_bm;
PORTF.PIN3CTRL = PORT_PULLUPEN_bm;
PORTF.PIN4CTRL = PORT_PULLUPEN_bm;
PORTF.PIN5CTRL = PORT_PULLUPEN_bm;
#elif defined(__AVR_48PIN__) || defined(__AVR_64PIN__)
PORTB.PIN0CTRL = PORT_PULLUPEN_bm;
PORTB.PIN1CTRL = PORT_PULLUPEN_bm;
PORTB.PIN2CTRL = PORT_PULLUPEN_bm;
PORTB.PIN3CTRL = PORT_PULLUPEN_bm;
PORTB.PIN4CTRL = PORT_PULLUPEN_bm;
PORTB.PIN5CTRL = PORT_PULLUPEN_bm;
PORTC.PIN4CTRL = PORT_PULLUPEN_bm;
PORTC.PIN5CTRL = PORT_PULLUPEN_bm;
PORTC.PIN6CTRL = PORT_PULLUPEN_bm;
PORTC.PIN7CTRL = PORT_PULLUPEN_bm;
PORTE.PIN0CTRL = PORT_PULLUPEN_bm;
PORTE.PIN1CTRL = PORT_PULLUPEN_bm;
PORTE.PIN2CTRL = PORT_PULLUPEN_bm;
PORTE.PIN3CTRL = PORT_PULLUPEN_bm;
#elif defined(__AVR_64PIN__)
PORTB.PIN6CTRL = PORT_PULLUPEN_bm;
PORTB.PIN7CTRL = PORT_PULLUPEN_bm;
PORTE.PIN4CTRL = PORT_PULLUPEN_bm;
PORTE.PIN5CTRL = PORT_PULLUPEN_bm;
PORTE.PIN6CTRL = PORT_PULLUPEN_bm;
PORTE.PIN7CTRL = PORT_PULLUPEN_bm;
PORTG.PIN0CTRL = PORT_PULLUPEN_bm;
PORTG.PIN1CTRL = PORT_PULLUPEN_bm;
PORTG.PIN2CTRL = PORT_PULLUPEN_bm;
PORTG.PIN3CTRL = PORT_PULLUPEN_bm;
PORTG.PIN4CTRL = PORT_PULLUPEN_bm;
PORTG.PIN5CTRL = PORT_PULLUPEN_bm;
PORTG.PIN6CTRL = PORT_PULLUPEN_bm;
PORTG.PIN7CTRL = PORT_PULLUPEN_bm;
#endif
// standard programming only
#if not defined (USE_HV_PROGRAMMING)
PORTA.PIN2CTRL = PORT_PULLUPEN_bm;
PORTC.PIN0CTRL = PORT_PULLUPEN_bm;
PORTC.PIN1CTRL = PORT_PULLUPEN_bm;
PORTC.PIN2CTRL = PORT_PULLUPEN_bm;
PORTC.PIN3CTRL = PORT_PULLUPEN_bm;
PORTD.PIN0CTRL = PORT_PULLUPEN_bm;
PORTD.PIN1CTRL = PORT_PULLUPEN_bm;
PORTD.PIN2CTRL = PORT_PULLUPEN_bm;
PORTD.PIN3CTRL = PORT_PULLUPEN_bm;
PORTD.PIN4CTRL = PORT_PULLUPEN_bm;
PORTD.PIN5CTRL = PORT_PULLUPEN_bm;
PORTD.PIN6CTRL = PORT_PULLUPEN_bm;
PORTD.PIN7CTRL = PORT_PULLUPEN_bm;
#else // hv programming only
// Output Pins
PORTA.DIRSET = PIN2_bm | PIN6_bm | PIN7_bm; // Power Switch, LED2-HVLED, LED
PORTA.OUTSET = PIN2_bm; // enable power switch
PORTC.DIRSET = cpp | cp1 | cp2 | cps; // set charge pump power, clock1, clock2 and shutdown as output
PORTC.OUTSET = cps; // enable charge pump shutdown
PORTD.DIRSET = PIN0_bm | PIN1_bm | PIN2_bm | PIN3_bm | PIN4_bm | PIN5_bm; // set target power port as output
PORTD.OUTSET = PIN0_bm | PIN1_bm | PIN2_bm | PIN3_bm | PIN4_bm | PIN5_bm; // turn on target power
#endif
#endif
}
void SYS::setLED(void){
PORT(LED_PORT) |= 1 << LED_PIN;
}
void SYS::clearLED(void){
PORT(LED_PORT) &= ~(1 << LED_PIN);
}
void SYS::setVerLED(void){
#ifdef LED2_PORT
PORT(LED2_PORT) |= 1 << LED2_PIN;
#endif
}
void SYS::clearVerLED(void){
#ifdef LED2_PORT
PORT(LED2_PORT) &= ~(1 << LED2_PIN);
#endif
}
void SYS::setHVLED(void){
#if defined(USE_HV_PROGRAMMING)
PORT(HVLED_PORT) |= 1 << HVLED_PIN;
#endif
}
void SYS::clearHVLED(void){
#if defined(USE_HV_PROGRAMMING)
PORT(HVLED_PORT) &= ~(1 << HVLED_PIN);
#endif
}
void SYS::pulseHV(void) {
#if defined(USE_HV_PROGRAMMING)
SYS::setHVLED();
_delay_ms(1); // initial delay after startup
#if defined(__AVR_ATmega328P__)
PORTB &= ~0b00001000; // clear cps
PORTB |= 0b00010000; // set cpp
#elif defined(__AVR_ATtiny_Zero_One__)
PORTB.OUTCLR = cps; // clear cps
PORTA.OUTSET = cpp; // set cpp
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTC.OUTCLR = cps; // clear cps
PORTC.OUTSET = cpp; // set cpp
#endif
for (int j = 0; j <= 200; j++) {
#if defined(__AVR_ATmega328P__)
PORTB &= ~0b00000100; // clear cp2
PORTB |= 0b00000010; // set cp1
#elif defined (__AVR_ATtiny_Zero_One__)
PORTA.OUTCLR = cp1 | cp2;
__builtin_avr_nops(4);
PORTA.OUTSET = cp1;
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTC.OUTCLR = cp1 | cp2;
__builtin_avr_nops(4);
PORTC.OUTSET = cp1;
#endif
__builtin_avr_nops(9);
#if defined(__AVR_ATmega328P__)
PORTB &= ~0b00000010; // clear cp1
PORTB |= 0b00000100; // set cp2
#elif defined(__AVR_ATtiny_Zero_One__)
PORTA.OUTCLR = cp1 | cp2;
__builtin_avr_nops(4);
PORTA.OUTSET = cp2;
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTC.OUTCLR = cp1 | cp2;
__builtin_avr_nops(4);
PORTC.OUTSET = cp2;
#endif
__builtin_avr_nops(9);
}
#if defined(__AVR_ATmega328P__)
PORTB &= ~0b00000100; // clear cp2
PORTB &= ~0b00010000; // clear cpp
PORTB |= 0b00001000; // set cps
PORTD &= ~0b01000000; // UPDI pullup disabled
DDRD &= ~0b01000000; // UPDI rx enable
#elif defined(__AVR_ATtiny_Zero_One__)
PORTA.OUTCLR = cp2; // clear cp2
PORTA.OUTCLR = cpp; // clear cpp
PORTB.PIN0CTRL &= ~PORT_PULLUPEN_bm; // UPDI pullup disabled
PORTB.DIRSET = PIN0_bm; // UPDI rx enable
PORTB.OUTSET = cps; // set cps
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTC.OUTCLR = cp2; // clear cp2
PORTC.OUTCLR = cpp; // clear cpp
PORTA.PIN3CTRL &= ~PORT_PULLUPEN_bm; // UPDI pullup disabled
PORTA.DIRSET = PIN3_bm; // UPDI rx enable
PORTC.OUTSET = cps; // set cps
#endif
_delay_ms(49); // tri-state duration after HV pulse
SYS::clearHVLED();
#endif
}
void SYS::updiTriState(void) {
#if defined(USE_HV_PROGRAMMING)
#if defined(__AVR_ATmega328P__)
DDRD &= ~0b01000000; // UPDI rx enable
PORTD &= ~0b01000000; // low
#elif defined(__AVR_ATtiny_Zero_One__)
PORTB.DIRCLR = PIN0_bm; // UPDI rx enable
PORTB.PIN0CTRL &= ~PORT_PULLUPEN_bm; // UPDI pullup disabled
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTA.DIRCLR = PIN3_bm; // UPDI rx enable
PORTA.PIN3CTRL &= ~PORT_PULLUPEN_bm; // UPDI pullup disabled
#endif
#endif
}
void SYS::updiHigh(void) {
#if defined(USE_HV_PROGRAMMING)
#if defined(__AVR_ATmega328P__)
PORTD |= 0b01000000; // enable pullup
DDRD |= 0b01000000; // UPDI tx enable, goes high
#elif defined(__AVR_ATtiny_Zero_One__)
PORTB.OUTSET = PIN0_bm; // high
PORTB.DIRSET = PIN0_bm; // UPDI tx enable
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTA.OUTSET = PIN3_bm; // high
PORTA.DIRSET = PIN3_bm; // UPDI tx enable
#endif
_delay_us(20);
#endif
}
void SYS::updiIdle(void) {
#if defined(USE_HV_PROGRAMMING)
SYS::updiHigh();
SYS::updiTriState();
_delay_us(521);
SYS::updiHigh();
#endif
}
void SYS::updiInitiate(void) {
#if defined(USE_HV_PROGRAMMING)
// Release UPDI Reset and initiate UPDI Enable by driving low (0.7µs) then tri-state
#if defined(__AVR_ATmega328P__)
SYS::updiHigh();
PORTD &= ~0b01000000; // low
__builtin_avr_nops(5);
SYS::updiTriState();
#elif defined(__AVR_ATtiny_Zero_One__)
PORTB.DIRSET = PIN0_bm; // UPDI tx enable
PORTB.OUTSET = PIN0_bm; // high
PORTB.OUTCLR = PIN0_bm; // low
__builtin_avr_nops(5);
PORTB.PIN0CTRL &= ~PORT_PULLUPEN_bm; // UPDI pullup disabled
PORTB.DIRCLR = PIN0_bm; // UPDI rx enable (tri-state)
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTA.DIRSET = PIN3_bm; // UPDI tx enable
PORTA.OUTSET = PIN3_bm; // high
PORTA.OUTCLR = PIN3_bm; // low
__builtin_avr_nops(5);
PORTA.PIN3CTRL &= ~PORT_PULLUPEN_bm; // UPDI pullup disabled
PORTA.DIRCLR = PIN3_bm; // UPDI rx enable (tri-state)
#endif
_delay_us(521); // tri-state duration after UPDI Enable trigger pulse
#endif
}
void SYS::updiEnable(void) {
#if defined(USE_HV_PROGRAMMING)
SYS::updiInitiate();
SYS::updiHigh();
UPDI::write_key(UPDI::NVM_Prog);
SYS::updiIdle();
UPDI_io::put(UPDI::SYNCH);
SYS::updiHigh();
SYS::updiTriState();
_delay_us(521);
#endif
}
void SYS::setPOWER(void) {
#if defined(USE_HV_PROGRAMMING)
#if defined(__AVR_ATmega328P__)
DDRC |= 0b00111111; // enable pullups (VTG)
PORTC |= 0b00111111; // set as outputs (VTG)
#elif defined(__AVR_ATmega_Mega__)
DDRF |= 0b00111111; // enable pullups (VTG)
PORTF |= 0b00111111; // set as outputs (VTG)
DDRB |= 0b01000000; // enable pullup (power switch)
PORTB |= 0b01000000; // set as output (power switch)
#elif defined(__AVR_ATtiny_Zero_One__) || defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTA.OUTSET = PIN2_bm; // power switch high
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTD.OUTSET = PIN0_bm | PIN1_bm | PIN2_bm | PIN3_bm | PIN4_bm | PIN5_bm; // turn on target power port
#endif
_delay_us(10);
#endif
}
void SYS::clearPOWER(void) {
#if defined(USE_HV_PROGRAMMING)
#if defined(__AVR_ATmega328P__)
DDRC &= 0b11000000; // disable pullups (VTG)
PORTC &= 0b11000000; // set as inputs (VTG)
#elif defined(__AVR_ATmega_Mega__)
DDRF &= 0b11000000; // disable pullups (VTG)
PORTF &= 0b11000000; // set as inputs (VTG)
DDRB &= 0b10111111; // disable pullup (power switch)
PORTB &= 0b10111111; // set as input (power switch)
#elif defined(__AVR_ATtiny_Zero_One__) || defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTA.OUTCLR = PIN2_bm; // power switch low
#elif defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
PORTD.OUTCLR = PIN0_bm | PIN1_bm | PIN2_bm | PIN3_bm | PIN4_bm | PIN5_bm; // turn off target power port
#endif
#endif
}
void SYS::cyclePOWER(void) {
#if defined(USE_HV_PROGRAMMING)
SYS::clearPOWER();
_delay_ms(115);
SYS::setPOWER();
#endif
}
void SYS::checkOVERLOAD(void) { // Sense overload on target power port
#if defined(USE_HV_PROGRAMMING)
#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega_Mega__)
ADCSRA = (1 << ADEN); // turn ADC on
ADCSRA |= (1 << ADPS0) | (1 << ADPS2); // prescaler of 32
ADMUX = (1 << REFS0) | (1 << ADLAR) | (6 & 0x07); // AVcc reference, 8-bit result, select A6
uint16_t sum = 0;
for (int i = 0 ; i < 250 ; i++) { // totalize 250 8-bit readings
ADCSRA |= (1 << ADSC); // start a conversion
while (ADCSRA & (1 << ADSC)); // wait while busy
sum += ADCH; // totalize ADC result
}
#elif defined(__AVR_ATmega_Zero__)
PORTD_PIN6CTRL = 0x04; // disable digital input buffer on PD6
ADC0_CTRLA = ADC_RESSEL_8BIT_gc; // 8-bit resolution
ADC0_CTRLC = 0x54; // reduced capacitance, Vdd ref, prescaler of 32
ADC0_MUXPOS = 0x06; // select AIN6
ADC0_CTRLA |= ADC_ENABLE_bm; // turn ADC on
uint16_t sum = 0;
for (int i = 0 ; i < 250 ; i++) { // totalize 250 8-bit readings
ADC0_COMMAND |= ADC_STCONV_bm; // start a conversion
while (ADC0_COMMAND & ADC_STCONV_bm); // wait while busy
sum += ADC0_RESL; // totalize ADC result
}
#elif defined(__AVR_DA__)
PORTD.PIN6CTRL |= PORT_ISC_INPUT_DISABLE_gc; // disable digital input buffer for PD6
PORTD.PIN6CTRL &= ~PORT_PULLUPEN_bm; // disable pull-up resistor for PD6
ADC0.MUXPOS = ADC_MUXPOS_AIN6_gc; // Select ADC channel AIN6 (PD6)
ADC0.CTRLC = ADC_PRESC_DIV32_gc; // CLK_PER divided by 32
VREF.ADC0REF = VREF_REFSEL_VDD_gc; // VDD as reference
uint16_t sum = 0;
for (int i = 0 ; i < 63 ; i++) { // totalize 63 10-bit readings
ADC0.CTRLA = ADC_ENABLE_bm /* ADC Enable: enabled */
| ADC_RESSEL_10BIT_gc; /* 10-bit mode */
ADC0.COMMAND = ADC_STCONV_bm; // start a conversion
while (!(ADC0.INTFLAGS & ADC_RESRDY_bm)); // wait while busy
sum += ADC0_RES; // totalize ADC result
}
# endif
#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega_Mega__) || defined(__AVR_ATmega_Zero__) || defined(__AVR_DA__)
if ((sum / 250) <= 230) { // if voltage on bridged port outputs <= 4.5V
while (1) { // OVERLOAD (fix circuit then press Reset)
clearPOWER(); // turn off target power then flash LED at 4Hz
setLED();
_delay_ms(50);
clearLED();
_delay_ms(200);
}
}
# endif
#endif
}
uint8_t SYS::checkHVMODE() { // Check HV Programming Mode Switch
#if defined(USE_HV_PROGRAMMING)
#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega_Mega__)
ADCSRA = (1 << ADEN); // turn ADC on
ADCSRA |= (1 << ADPS0) | (1 << ADPS2); // prescaler of 32
ADMUX = (1 << REFS0) | (1 << ADLAR) | (7 & 0x07); // use AVcc reference, 8-bit result, select A7
ADCSRA |= (1 << ADSC); // start a conversion
while (ADCSRA & (1 << ADSC)); // wait while busy
return ADCH; // return HV mode jumper setting
#elif defined(__AVR_ATtiny_Zero_One__)
PORTA_PIN1CTRL = 0x04; // disable digital input buffer for PA1
ADC0_CTRLA = ADC_RESSEL_8BIT_gc; // 8-bit resolution
ADC0_CTRLC = 0x54; // reduced capacitance, Vdd ref, prescaler of 32
ADC0_MUXPOS = 0x01; // select AIN1
ADC0_CTRLA |= ADC_ENABLE_bm; // turn ADC on
ADC0_COMMAND |= ADC_STCONV_bm; // start a conversion
while (ADC0_COMMAND & ADC_STCONV_bm); // wait while busy
return ADC0_RESL; // return HV mode jumper setting
#elif defined(__AVR_ATmega_Zero__)
PORTD_PIN7CTRL = 0x04; // disable digital input buffer for PD7
ADC0_CTRLA = ADC_RESSEL_8BIT_gc; // 8-bit resolution
ADC0_CTRLC = 0x54; // reduced capacitance, Vdd ref, prescaler of 32
ADC0_MUXPOS = 0x07; // select AIN7
ADC0_CTRLA |= ADC_ENABLE_bm; // turn ADC on
ADC0_COMMAND |= ADC_STCONV_bm; // start a conversion
while (ADC0_COMMAND & ADC_STCONV_bm); // wait while busy
return ADC0_RESL; // return HV mode jumper setting
#elif defined(__AVR_DA__)
PORTD.PIN7CTRL |= PORT_ISC_INPUT_DISABLE_gc; // disable digital input buffer for PD7
PORTD.PIN7CTRL &= ~PORT_PULLUPEN_bm; // disable pull-up resistor for PD7
ADC0.MUXPOS = ADC_MUXPOS_AIN7_gc; // Select ADC channel AIN7 (PD7)
ADC0.CTRLC = ADC_PRESC_DIV32_gc; // CLK_PER divided by 32
VREF.ADC0REF = VREF_REFSEL_VDD_gc; // VDD as reference
ADC0.CTRLA = ADC_ENABLE_bm /* ADC Enable: enabled */
| ADC_RESSEL_10BIT_gc; /* 10-bit mode */
ADC0.COMMAND = ADC_STCONV_bm; // start a conversion
while (!(ADC0.INTFLAGS & ADC_RESRDY_bm)); // wait while busy
return ADC0.RES >> 2; // return HV mode jumper setting
#else
return 0;
# endif
#else
return 0;
#endif
}