3 files changed, 290 insertions, 0 deletions
diff --git a/hw/thefreeman/lin16dac/cfg.h b/hw/thefreeman/lin16dac/cfg.h
new file mode 100644
index 0000000..20d2bf5
--- /dev/null
+++ b/hw/thefreeman/lin16dac/cfg.h
@@ -0,0 +1,61 @@
+// thefreeman's Linear 16 driver using DAC control
+// Copyright (C) 2021-2023 (FIXME)
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+#define MODEL_NUMBER "1630"
+#include "hwdef-thefreeman-lin16dac.h"
+// ATTINY: 1616
+
+// the button lights up
+#define USE_INDICATOR_LED
+// the button is visible while main LEDs are on
+#define USE_INDICATOR_LED_WHILE_RAMPING
+// off mode: low (1)
+// lockout: blinking (3)
+#define INDICATOR_LED_DEFAULT_MODE ((3<<2) + 1)
+
+// level_calc.py ninth 2 150 7135 1 0.03 6.4 7135 1 6.3 1600
+#define RAMP_SIZE 150
+
+// 4 ramp segments:
+//   - low 0.55V
+//   - low 2.5V
+//   - high 0.55V
+//   - high 2.5V
+// PWM1: DAC Data
+// FIXME: ramp stalls with 8 duplicate levels in a row
+//        (maybe use 1.1V Vref during that part of the ramp?)
+#define PWM1_LEVELS  25, 25, 33, 41, 41, 50, 58, 66, 75, 83, 92,108,117,133,150,167,192,209,234, \
+                     58, 64, 71, 80, 90, 99,110,121,134,149,163,180,198,218,241, \
+                      1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  3,  3,  3,  3,  4,  4,  4,  5,  5,  6,  6,  7,  7,  8,  8,  9, 10, 11, 11, 12, 13, 14, 15, 16, 18, 19, 20, 22, 23, 25, 26, 28, 30, 32, 34, 36, 39, 41, 44, 47, 50, 53, 56, 59, 63, 67, 71, 75, 79, 84, 89, 94,100,105,112,118,124,131,139,146,154,163,172,181,191,201,212,223,234,246, \
+                     57, 60, 63, 66, 69, 73, 76, 80, 84, 88, 93, 97,102,107,112,117,123,129,135,141,147,154,161,169,176,184,193,201,210,220,229,239,250,255
+// PWM Tops: VREF selector (0.55V=16,1.1V=17, 2.5V=18, 4.3V=19, 1.5V=20)
+#define PWM_TOPS     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, \
+                     18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, \
+                     16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, \
+                     18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18
+
+#define MAX_1x7135            34
+#define HDR_ENABLE_LEVEL_MIN  35  // bottom level of top half of the ramp
+#define HALFSPEED_LEVEL       255  // always run at 1/4th speed
+#define QUARTERSPEED_LEVEL    255  // because DAC doesn't use PWM
+
+#define RAMP_SMOOTH_FLOOR    1
+#define RAMP_SMOOTH_CEIL     120
+// 10, 28, 46, [65], 83, 101, 120
+#define RAMP_DISCRETE_FLOOR  10
+#define RAMP_DISCRETE_CEIL   RAMP_SMOOTH_CEIL
+#define RAMP_DISCRETE_STEPS  7
+
+// stop panicking at ~30% power
+#define THERM_FASTER_LEVEL 123
+
+// enable 2 click turbo
+#define DEFAULT_2C_STYLE 1
+
+// don't blink mid-ramp
+#ifdef BLINK_AT_RAMP_MIDDLE
+#undef BLINK_AT_RAMP_MIDDLE
+#endif
+
diff --git a/hw/thefreeman/lin16dac/hwdef.c b/hw/thefreeman/lin16dac/hwdef.c
new file mode 100644
index 0000000..07c7f9e
--- /dev/null
+++ b/hw/thefreeman/lin16dac/hwdef.c
@@ -0,0 +1,92 @@
+// thefreeman linear t1616 DAC driver helper functions
+// Copyright (C) 2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+#include "chan-aux.c"
+
+void set_level_zero();
+
+void set_level_main(uint8_t level);
+bool gradual_tick_main(uint8_t gt);
+
+
+Channel channels[] = {
+    { // main LEDs
+        .set_level    = set_level_main,
+        .gradual_tick = gradual_tick_main
+    },
+    AUX_CHANNELS
+};
+
+
+void set_level_zero() {
+    DAC_LVL  = 0;  // DAC off
+    DAC_VREF = V055;  // low Vref
+    HDR_ENABLE_PORT &= ~(1 << HDR_ENABLE_PIN);  // HDR off
+
+    // prevent post-off flash
+    //IN_NFET_ENABLE_PORT |= (1 << IN_NFET_ENABLE_PIN);
+    //delay_4ms(IN_NFET_DELAY_TIME/4);
+    //IN_NFET_ENABLE_PORT &= ~(1 << IN_NFET_ENABLE_PIN);
+
+    // turn off opamp last
+    OPAMP_ENABLE_PORT &= ~(1 << OPAMP_ENABLE_PIN);  // Opamp off
+}
+
+// single set of LEDs with 1 regulated power channel
+// and low/high HDR plus low/high Vref as different "gears"
+void set_level_main(uint8_t level) {
+    #if 0  // unsure if this helps anything
+    uint8_t noflash = 0;
+
+    // when turning on from off, try to prevent a flash
+    if ((! actual_level) && (level < HDR_ENABLE_LEVEL_MIN)) {
+        noflash = 1;
+    }
+    #endif
+
+    // Opamp on first, to give it a few extra microseconds to spin up
+    OPAMP_ENABLE_PORT |= (1 << OPAMP_ENABLE_PIN);
+
+    // pre-load ramp data so it can be assigned faster later
+    PWM_DATATYPE dac_lvl  = PWM_GET(pwm1_levels, level);
+    PWM_DATATYPE dac_vref = PWM_GET(pwm_tops, level);
+
+    // enable HDR on top half of ramp
+    if (level >= (HDR_ENABLE_LEVEL_MIN-1))
+        HDR_ENABLE_PORT |= (1 << HDR_ENABLE_PIN);
+    else
+        HDR_ENABLE_PORT &= ~(1 << HDR_ENABLE_PIN);
+
+    #if 0
+    if (noflash) {
+        // wait for flash prevention to finish
+        delay_4ms(OPAMP_ON_DELAY/4);
+    }
+    #endif
+
+    // set these in successive clock cycles to avoid getting out of sync
+    // (minimizes ramp bumps when changing gears)
+    DAC_LVL  = dac_lvl;
+    DAC_VREF = dac_vref;
+}
+
+bool gradual_tick_main(uint8_t gt) {
+    // if HDR and Vref "engine gear" is the same, do a small adjustment...
+    // otherwise, simply jump to the next ramp level
+    //   and let set_level() handle any gear changes
+
+    PWM_DATATYPE dac_next  = PWM_GET(pwm1_levels, gt);
+    PWM_DATATYPE vref_next = PWM_GET(pwm_tops, gt);
+
+    // different gear = full adjustment
+    if (vref_next != DAC_VREF) return true;  // let parent set_level() for us
+
+    // same gear = small adjustment
+    GRADUAL_ADJUST_SIMPLE(dac_next, DAC_LVL);
+    if (dac_next == DAC_LVL) return true;  // done
+
+    return false;  // not done yet
+}
+
diff --git a/hw/thefreeman/lin16dac/hwdef.h b/hw/thefreeman/lin16dac/hwdef.h
new file mode 100644
index 0000000..c0d0638
--- /dev/null
+++ b/hw/thefreeman/lin16dac/hwdef.h
@@ -0,0 +1,137 @@
+// thefreeman's Linear 16 driver using DAC control
+// Copyright (C) 2021-2023 thefreeman, Selene ToyKeeper
+// 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 ATTINY 1616
+#include <avr/io.h>
+
+#define HWDEF_C_FILE hwdef-thefreeman-lin16dac.c
+
+// allow using aux LEDs as extra channel modes
+#include "chan-aux.h"
+
+// channel modes:
+// * 0. main LEDs
+// * 1+. aux RGB
+#define NUM_CHANNEL_MODES  2
+enum CHANNEL_MODES {
+    CM_MAIN = 0,
+    CM_AUX
+};
+
+#define DEFAULT_CHANNEL_MODE  CM_MAIN
+
+// right-most bit first, modes are in fedcba9876543210 order
+#define CHANNEL_MODES_ENABLED 0b0000000000000001
+
+
+#define PWM_CHANNELS  1  // old, remove this
+
+#define PWM_BITS      8         // 8-bit DAC
+#define PWM_GET       PWM_GET8
+#define PWM_DATATYPE  uint8_t
+#define PWM_DATATYPE2 uint16_t  // only needs 32-bit if ramp values go over 255
+#define PWM1_DATATYPE uint8_t   // main LED ramp
+
+// main LED outputs
+#define DAC_LVL   DAC0.DATA    // 0 to 255, for 0V to Vref
+#define DAC_VREF  VREF.CTRLA   // 0.55V or 2.5V
+#define PWM_TOP_INIT  255      // highest value used in top half of ramp (unused?)
+// Vref values
+#define V055  16
+#define V11   17
+#define V25   18
+#define V43   19
+#define V15   20
+
+// Opamp enable
+// For turning on and off the op-amp
+#define OPAMP_ENABLE_PIN   PIN7_bp
+#define OPAMP_ENABLE_PORT  PORTA_OUT
+// how many ms to delay turning on the lights after enabling the channel
+// (FIXME: 80 is long enough it's likely to cause bugs elsewhere,
+//  as events stack up unhandled for 5 consecutive WDT ticks)
+#define OPAMP_ON_DELAY 80
+
+// HDR
+// turns on HDR FET for the high current range
+#define HDR_ENABLE_PIN   PIN3_bp
+#define HDR_ENABLE_PORT  PORTB_OUT
+
+// e-switch
+#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
+
+// 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
+#define AUXLED_PIN   PIN5_bp
+#define AUXLED_PORT  PORTB
+
+
+inline void hwdef_setup() {
+
+    // set up the system clock to run at 10 MHz instead of the default 3.33 MHz
+    // (it'll get underclocked to 2.5 MHz later)
+    // TODO: maybe run even slower?
+    _PROTECTED_WRITE( CLKCTRL.MCLKCTRLB,
+                      CLKCTRL_PDIV_2X_gc | CLKCTRL_PEN_bm );
+
+    VPORTA.DIR = PIN6_bm   // DAC
+               | PIN7_bm;  // Opamp
+    VPORTB.DIR = PIN3_bm;  // HDR
+    //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;  // e-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
+    // also VREF_DAC0REFSEL_0V55_gc and VREF_DAC0REFSEL_1V1_gc and VREF_DAC0REFSEL_2V5_gc
+    VREF.CTRLA |= VREF_DAC0REFSEL_2V5_gc;
+    VREF.CTRLB |= VREF_DAC0REFEN_bm;
+    DAC0.CTRLA = DAC_ENABLE_bm | DAC_OUTEN_bm;
+    DAC0.DATA = 255; // set the output voltage
+
+}
+
+
+#define LAYOUT_DEFINED
+