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// thefreeman's Linear 16 driver using DAC control
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// Copyright (C) 2021-2023 thefreeman, Selene ToyKeeper
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// SPDX-License-Identifier: GPL-3.0-or-later
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* PA6 - DAC for LED brightness control
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* PA7 - Op-amp enable pin
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* PB4 - Switch pin, internal pullup
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* PB3 - HDR control, set High to enable the high power channel, set Low for low power
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* Read voltage from VCC pin, has PFET so no drop
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#define HWDEF_C_FILE hwdef-thefreeman-lin16dac.c
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// allow using aux LEDs as extra channel modes
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#define NUM_CHANNEL_MODES 2
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#define DEFAULT_CHANNEL_MODE CM_MAIN
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// right-most bit first, modes are in fedcba9876543210 order
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#define CHANNEL_MODES_ENABLED 0b0000000000000001
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#define PWM_CHANNELS 1 // old, remove this
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#define PWM_BITS 8 // 8-bit DAC
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#define PWM_GET PWM_GET8
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#define PWM_DATATYPE uint8_t
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#define PWM_DATATYPE2 uint16_t // only needs 32-bit if ramp values go over 255
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#define PWM1_DATATYPE uint8_t // main LED ramp
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#define DAC_LVL DAC0.DATA // 0 to 255, for 0V to Vref
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#define DAC_VREF VREF.CTRLA // 0.55V or 2.5V
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#define PWM_TOP_INIT 255 // highest value used in top half of ramp (unused?)
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// For turning on and off the op-amp
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#define OPAMP_ENABLE_PIN PIN7_bp
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#define OPAMP_ENABLE_PORT PORTA_OUT
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// how many ms to delay turning on the lights after enabling the channel
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// (FIXME: 80 is long enough it's likely to cause bugs elsewhere,
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// as events stack up unhandled for 5 consecutive WDT ticks)
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#define OPAMP_ON_DELAY 80
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// turns on HDR FET for the high current range
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#define HDR_ENABLE_PIN PIN3_bp
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#define HDR_ENABLE_PORT PORTB_OUT
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#define SWITCH_PIN PIN4_bp
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#define SWITCH_PORT VPORTB.IN
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#define SWITCH_ISC_REG PORTB.PIN2CTRL
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#define SWITCH_VECT PORTB_PORT_vect
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#define SWITCH_INTFLG VPORTB.INTFLAGS
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// average drop across diode on this hardware
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#ifndef VOLTAGE_FUDGE_FACTOR
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#define VOLTAGE_FUDGE_FACTOR 0 // using a PFET so no appreciable drop
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#define AUXLED_PIN PIN5_bp
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#define AUXLED_PORT PORTB
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inline void hwdef_setup() {
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// set up the system clock to run at 10 MHz instead of the default 3.33 MHz
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// (it'll get underclocked to 2.5 MHz later)
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// TODO: maybe run even slower?
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_PROTECTED_WRITE( CLKCTRL.MCLKCTRLB,
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CLKCTRL_PDIV_2X_gc | CLKCTRL_PEN_bm );
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VPORTA.DIR = PIN6_bm // DAC
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VPORTB.DIR = PIN3_bm; // HDR
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//VPORTC.DIR = 0b00000000;
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// enable pullups on the input pins to reduce power
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PORTA.PIN0CTRL = PORT_PULLUPEN_bm;
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PORTA.PIN1CTRL = PORT_PULLUPEN_bm;
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PORTA.PIN2CTRL = PORT_PULLUPEN_bm;
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PORTA.PIN3CTRL = PORT_PULLUPEN_bm;
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PORTA.PIN4CTRL = PORT_PULLUPEN_bm;
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PORTA.PIN5CTRL = PORT_PULLUPEN_bm;
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//PORTA.PIN6CTRL = PORT_PULLUPEN_bm; // DAC ouput
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//PORTA.PIN7CTRL = PORT_PULLUPEN_bm; // Op-amp enable pin
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PORTB.PIN0CTRL = PORT_PULLUPEN_bm;
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PORTB.PIN1CTRL = PORT_PULLUPEN_bm;
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PORTB.PIN2CTRL = PORT_PULLUPEN_bm;
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//PORTB.PIN3CTRL = PORT_PULLUPEN_bm; // HDR channel selection
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PORTB.PIN4CTRL = PORT_PULLUPEN_bm
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| PORT_ISC_BOTHEDGES_gc; // e-switch
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//PORTB.PIN5CTRL = PORT_PULLUPEN_bm; // Aux LED
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PORTC.PIN0CTRL = PORT_PULLUPEN_bm;
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PORTC.PIN1CTRL = PORT_PULLUPEN_bm;
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PORTC.PIN2CTRL = PORT_PULLUPEN_bm;
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PORTC.PIN3CTRL = PORT_PULLUPEN_bm;
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// https://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny1614-16-17-DataSheet-DS40002204A.pdf
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// DAC ranges from 0V to (255 * Vref) / 256
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// also VREF_DAC0REFSEL_0V55_gc and VREF_DAC0REFSEL_1V1_gc and VREF_DAC0REFSEL_2V5_gc
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VREF.CTRLA |= VREF_DAC0REFSEL_2V5_gc;
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VREF.CTRLB |= VREF_DAC0REFEN_bm;
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DAC0.CTRLA = DAC_ENABLE_bm | DAC_OUTEN_bm;
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DAC0.DATA = 255; // set the output voltage
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#define LAYOUT_DEFINED
added
removed
ToyKeeper/hwdef-thefreeman-lin16dac.h
