Merge branch 'avr32dd20-devkit' into trunk

Added support for AVR DD MCUs, particularly avr32dd20.  Also did a bunch
of refactoring for how MCU support works, cleaned up the ADC code,
switched to consistent internal formats for voltage and temperature,
fixed the FW3X, and some other little things.

* avr32dd20-devkit: (28 commits)
  eliminated direct CCP register access from arch/attiny1616
  made the avr32dd20 flashing script more universal
  added a build target for FW3X with manually-fixed RGB aux wiring
  prevent future issues like the FW3X had
  fixed FW3X thermal regulation
  fixed incorrect temperature history for a few seconds after waking
  fsm/adc: removed dead code
  FW3X: fixed external temperature sensor
  FW3X: multiple upgrades...
  fw3x: fixed swapped red+blue, fixed battery measurements, added police color strobe
  fixed ADC on sp10-pro
  fixed ADC on attiny85 and related builds
  fixed ADC on attiny1634 and related builds
  more ADC / DAC / MCU progress...
  avr32dd20-devkit: make the defaults a bit more dev friendly (realtime voltage colors, and no simple UI by default)
  ADC voltage: battcheck 3 digits, fixed t1616, switched back to 8-bit internal volt unit
  got ADC voltage+temp working on avrdd... but broke all other builds/MCUs
  1.55V AA battery should not show as "white" voltage color, only purple
  started refactoring fsm/adc.*, but need a checkpoint before continuing
  added dac-scale.py: short script to calculate avrdd DAC+Vref values from level_calc.py ramp data
  ...

1 files changed, 115 insertions, 0 deletions

diff --git a/arch/avr32dd20.h b/arch/avr32dd20.h
new file mode 100644
index 0000000..09b4096
--- /dev/null
+++ b/arch/avr32dd20.h
@@ -0,0 +1,115 @@
+// arch/avr32dd20.h: avr32dd20 support header
+// Copyright (C) 2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+////////// clock speed / delay stuff //////////
+
+#define F_CPU  12000000UL
+#define BOGOMIPS  (F_CPU/3800)
+#define DELAY_ZERO_TIME  1020
+
+inline void mcu_clock_speed();
+
+///// clock dividers
+// this should work, but needs further validation
+inline void clock_prescale_set(uint8_t n);
+
+// TODO: allow hwdef to define a base clock speed,
+//       and adjust these values accordingly
+typedef enum
+{
+    // Actual clock is 12 MHz
+    clock_div_1 =   (0), // 12 MHz
+    clock_div_2 =   (CLKCTRL_PDIV_2X_gc  | CLKCTRL_PEN_bm), // 6 MHz
+    clock_div_4 =   (CLKCTRL_PDIV_4X_gc  | CLKCTRL_PEN_bm), // 3 MHz
+    clock_div_8 =   (CLKCTRL_PDIV_8X_gc  | CLKCTRL_PEN_bm), // 1.5 MHz
+    clock_div_16 =  (CLKCTRL_PDIV_16X_gc | CLKCTRL_PEN_bm), // 0.75 MHz
+    clock_div_32 =  (CLKCTRL_PDIV_32X_gc | CLKCTRL_PEN_bm), // 375 kHz
+    clock_div_64 =  (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 187.5 kHz
+} clock_div_t;
+
+
+////////// DAC controls //////////
+
+// main LED outputs
+#define DAC_LVL   DAC0_DATA    // 0 to 1023, for 0V to Vref
+#define DAC_VREF  VREF_DAC0REF // 1.024V, 2.048V, 4.096V, or 2.5V
+
+// Vref values (suitable for DAC and ADC0)
+#define V10   VREF_REFSEL_1V024_gc
+#define V20   VREF_REFSEL_2V048_gc
+#define V25   VREF_REFSEL_2V500_gc
+#define V40   VREF_REFSEL_4V096_gc
+
+
+////////// ADC voltage / temperature //////////
+
+#define hwdef_set_admux_therm  mcu_set_admux_therm
+inline void mcu_set_admux_therm();
+
+#define hwdef_set_admux_voltage mcu_set_admux_voltage
+inline void mcu_set_admux_voltage();
+
+inline void mcu_adc_sleep_mode();
+
+inline void mcu_adc_start_measurement();
+
+//#define mcu_adc_on  hwdef_set_admux_voltage
+//void mcu_adc_on();
+
+inline void mcu_adc_off();
+
+#define ADC_vect  ADC0_RESRDY_vect
+inline void mcu_adc_vect_clear();
+
+// both readings are left-aligned
+inline uint16_t mcu_adc_result();
+
+// read ADC differently for temperature and voltage
+//#define MCU_ADC_RESULT_PER_TYPE
+//inline uint16_t mcu_adc_result_temp();
+//inline uint16_t mcu_adc_result_volts();
+
+// return Volts * 40, range 0 to 6.375V
+#define voltage_raw2cooked  mcu_vdd_raw2cooked
+inline uint8_t mcu_vdd_raw2cooked(uint16_t measurement);
+
+// return (temp in Kelvin << 6)
+#define temp_raw2cooked  mcu_temp_raw2cooked
+inline uint16_t mcu_temp_raw2cooked(uint16_t measurement);
+
+inline uint8_t mcu_adc_lsb();
+
+
+////////// WDT //////////
+
+inline void mcu_wdt_active();
+
+inline void mcu_wdt_standby();
+
+inline void mcu_wdt_stop();
+
+#define WDT_vect  RTC_PIT_vect
+inline void mcu_wdt_vect_clear();
+
+
+////////// PCINT - pin change interrupt (e-switch) //////////
+
+// set these in hwdef
+//#define SWITCH_PORT     VPORTD.IN
+//#define SWITCH_VECT     PORTD_PORT_vect
+
+inline void mcu_switch_vect_clear();
+
+inline void mcu_pcint_on();
+
+inline void mcu_pcint_off();
+
+
+////////// misc //////////
+
+void reboot();
+
+inline void prevent_reboot_loop();
+