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, 98 insertions, 0 deletions

diff --git a/arch/attiny85.h b/arch/attiny85.h
new file mode 100644
index 0000000..3f6ffcb
--- /dev/null
+++ b/arch/attiny85.h
@@ -0,0 +1,98 @@
+// arch/attiny85.h: attiny85 support header
+// Copyright (C) 2014-2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+// fill in missing values from Atmel's headers
+#define PROGMEM_SIZE  8192
+#define EEPROM_SIZE   512
+
+////////// clock speed / delay stuff //////////
+
+// TODO: Use 6.4 MHz instead of 8 MHz?
+#define F_CPU  8000000UL
+#define BOGOMIPS  (F_CPU/4000)
+#define DELAY_ZERO_TIME  1020
+
+///// clock dividers
+// use clock_prescale_set(n) instead; it's safer
+//#define CLOCK_DIVIDER_SET(n) {CLKPR = 1<<CLKPCE; CLKPR = n;}
+
+
+////////// default hw_setup() //////////
+
+#ifdef USE_GENERIC_HWDEF_SETUP
+static inline void hwdef_setup();
+#endif
+
+
+////////// ADC voltage / temperature //////////
+
+#define V_REF REFS1
+#define VOLTAGE_ADC_DIDR DIDR0  // this MCU only has one DIDR
+
+// (1 << V_REF) | (0 << ADLAR) | (VCC_CHANNEL)
+#define ADMUX_VCC 0b00001100
+// (1 << V_REF) | (0 << ADLAR) | (THERM_CHANNEL)
+#define ADMUX_THERM 0b10001111
+
+#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();
+
+inline void mcu_adc_off();
+
+// NOP because interrupt flag clears itself
+#define mcu_adc_vect_clear()
+
+inline uint16_t mcu_adc_result();
+
+// return Volts * 40, range 0 to 6.375V
+#define voltage_raw2cooked  mcu_vdd_raw2cooked
+inline uint8_t mcu_vdd_raw2cooked(uint16_t measurement);
+inline uint8_t mcu_vdivider_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();
+
+// NOP because interrupt flag clears itself
+#define mcu_wdt_vect_clear()
+
+
+////////// PCINT - pin change interrupt (e-switch) //////////
+
+#define SWITCH_PORT  PINB  // PINA or PINB or PINC
+#define SWITCH_VECT  PCINT0_vect
+
+// NOP because interrupt flag clears itself
+#define mcu_switch_vect_clear()
+
+inline void mcu_pcint_on();
+
+inline void mcu_pcint_off();
+
+
+////////// misc //////////
+
+void reboot();
+
+inline void prevent_reboot_loop();
+