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// thefreeman's Linear 16 driver using DAC control
// Copyright (C) 2021-2023 (FIXME)
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
/*
* PA6 - DAC for LED brightness control
* PA7 - Op-amp enable pin
* PB5 - Aux LED
* PB4 - Switch pin, internal pullup
* PB3 - HDR control, set High to enable the high power channel, set Low for low power
* Read voltage from VCC pin, has PFET so no drop
*/
#define LAYOUT_DEFINED
#ifdef ATTINY
#undef ATTINY
#endif
#define ATTINY 1616
#include <avr/io.h>
#define PWM_CHANNELS 1
#define USE_DYN_PWM // dynamic frequency and speed
#ifndef SWITCH_PIN
#define SWITCH_PIN PIN4_bp
#define SWITCH_PORT VPORTB.IN
#define SWITCH_ISC_REG PORTB.PIN2CTRL
#define SWITCH_VECT PORTB_PORT_vect
#define SWITCH_INTFLG VPORTB.INTFLAGS
#endif
#define PWM1_LVL DAC0.DATA // use this for DAC voltage output
// PWM parameters of both channels are tied together because they share a counter
#define PWM1_TOP VREF.CTRLA // holds the TOP value for for variable-resolution PWM
// For enabling / disabling the HDR high-range channel
#define LED_ENABLE_PIN PIN3_bp
#define LED_ENABLE_PORT PORTB_OUT
#define LED_ENABLE_PIN_LEVEL_MIN 35
#define LED_ENABLE_PIN_LEVEL_MAX 150
// For turning on and off the op-amp
#define LED2_ENABLE_PIN PIN7_bp
#define LED2_ENABLE_PORT PORTA_OUT
#define LED2_ON_DELAY 80 // how many ms to delay turning on the lights after enabling the channel
// average drop across diode on this hardware
#ifndef VOLTAGE_FUDGE_FACTOR
#define VOLTAGE_FUDGE_FACTOR 0 // using a PFET so no appreciable drop
#endif
// lighted button
#ifndef AUXLED_PIN
#define AUXLED_PIN PIN5_bp
#define AUXLED_PORT PORTB
#endif
// with so many pins, doing this all with #ifdefs gets awkward...
// ... so just hardcode it in each hwdef file instead
inline void hwdef_setup() {
// set up the system clock to run at 10 MHz instead of the default 3.33 MHz
// TODO: for this DAC controlled-light, try to decrease the clock speed or use the ULP
_PROTECTED_WRITE( CLKCTRL.MCLKCTRLB, CLKCTRL_PDIV_2X_gc | CLKCTRL_PEN_bm );
VPORTA.DIR = PIN6_bm | PIN7_bm;
VPORTB.DIR = PIN3_bm;
//VPORTC.DIR = 0b00000000;
// enable pullups on the input pins to reduce power
PORTA.PIN0CTRL = PORT_PULLUPEN_bm;
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;
//PORTA.PIN6CTRL = PORT_PULLUPEN_bm; // DAC ouput
//PORTA.PIN7CTRL = PORT_PULLUPEN_bm; // Op-amp enable pin
PORTB.PIN0CTRL = PORT_PULLUPEN_bm;
PORTB.PIN1CTRL = PORT_PULLUPEN_bm;
PORTB.PIN2CTRL = PORT_PULLUPEN_bm;
//PORTB.PIN3CTRL = PORT_PULLUPEN_bm; // HDR channel selection
PORTB.PIN4CTRL = PORT_PULLUPEN_bm | PORT_ISC_BOTHEDGES_gc; // switch
//PORTB.PIN5CTRL = PORT_PULLUPEN_bm; // Aux LED
PORTC.PIN0CTRL = PORT_PULLUPEN_bm;
PORTC.PIN1CTRL = PORT_PULLUPEN_bm;
PORTC.PIN2CTRL = PORT_PULLUPEN_bm;
PORTC.PIN3CTRL = PORT_PULLUPEN_bm;
// set up the DAC
// https://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny1614-16-17-DataSheet-DS40002204A.pdf
// DAC ranges from 0V to (255 * Vref) / 256
VREF.CTRLA |= VREF_DAC0REFSEL_2V5_gc; // also VREF_DAC0REFSEL_0V55_gc and VREF_DAC0REFSEL_1V1_gc and VREF_DAC0REFSEL_2V5_gc
VREF.CTRLB |= VREF_DAC0REFEN_bm;
DAC0.CTRLA = DAC_ENABLE_bm | DAC_OUTEN_bm;
DAC0.DATA = 255; // set the output voltage
}
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