refactor checkpoint: splitting MCU-specific code into arch/$MCU.[ch]

Phew, that's a lot of changes!  And there's still a lot more to do...

1 files changed, 96 insertions, 0 deletions

diff --git a/arch/attiny1616.h b/arch/attiny1616.h
new file mode 100644
index 0000000..5989785
--- /dev/null
+++ b/arch/attiny1616.h
@@ -0,0 +1,96 @@
+// arch/attiny1616.h: attiny1616 support header
+// Copyright (C) 2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+// FIXME: remove this
+#define AVRXMEGA3
+
+////////// clock speed / delay stuff //////////
+
+#define F_CPU  10000000UL
+#define BOGOMIPS  (F_CPU/4700)
+#define DELAY_ZERO_TIME  1020
+
+///// clock dividers
+// this should work, but needs further validation
+inline void clock_prescale_set(uint8_t n);
+
+typedef enum
+{
+    // Actual clock is 20 MHz, but assume that 10 MHz is the top speed and work from there
+    // TODO: measure PWM speed and power use at 1.25/2.5/5/10 MHz, to determine which speeds are optimal
+    clock_div_1 =   (CLKCTRL_PDIV_2X_gc  | CLKCTRL_PEN_bm), // 10 MHz
+    clock_div_2 =   (CLKCTRL_PDIV_4X_gc  | CLKCTRL_PEN_bm), // 5 MHz
+    clock_div_4 =   (CLKCTRL_PDIV_8X_gc  | CLKCTRL_PEN_bm), // 2.5 MHz
+    clock_div_8 =   (CLKCTRL_PDIV_16X_gc | CLKCTRL_PEN_bm), // 1.25 MHz
+    clock_div_16 =  (CLKCTRL_PDIV_32X_gc | CLKCTRL_PEN_bm), // 625 kHz
+    clock_div_32 =  (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 312 kHz, max without changing to the 32 kHz ULP
+    clock_div_64 =  (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 312 kHz
+    clock_div_128 = (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm), // 312 kHz
+    clock_div_256 = (CLKCTRL_PDIV_64X_gc | CLKCTRL_PEN_bm)  // 312 kHz
+} clock_div_t;
+
+
+////////// 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();
+
+inline void mcu_adc_on();
+
+inline void mcu_adc_off();
+
+#define ADC_vect  ADC0_RESRDY_vect
+inline void mcu_adc_vect_clear();
+
+// 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();
+
+inline uint8_t mcu_adc_lsb();
+
+
+////////// WDT //////////
+
+inline void mcu_wdt_active();
+
+inline void mcu_wdt_standby();
+
+inline void mcu_wdt_stop();
+
+// *** Note for the AVRXMEGA3 (1-Series, eg 816 and 817), the WDT 
+// is not used for time-based interrupts.  A new peripheral, the 
+// Periodic Interrupt Timer ("PIT") is used for this purpose.
+
+#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  PINA
+//#define SWITCH_VECT  PCINT0_vect
+
+inline void mcu_switch_vect_clear();
+
+inline void mcu_pcint_on();
+
+inline void mcu_pcint_off();
+
+
+////////// misc //////////
+
+void reboot();
+