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, 98 insertions, 0 deletions

diff --git a/arch/attiny1634.h b/arch/attiny1634.h
new file mode 100644
index 0000000..e01abad
--- /dev/null
+++ b/arch/attiny1634.h
@@ -0,0 +1,98 @@
+// arch/attiny1634.h: attiny1634 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  16384
+#define EEPROM_SIZE   256
+
+////////// clock speed / delay stuff //////////
+
+#define F_CPU  8000000UL
+#define BOGOMIPS  (F_CPU/4000)
+#define DELAY_ZERO_TIME  1020
+
+///// clock dividers
+inline void clock_prescale_set(uint8_t n);
+
+typedef enum
+{
+    clock_div_1 = 0,
+    clock_div_2 = 1,
+    clock_div_4 = 2,
+    clock_div_8 = 3,
+    clock_div_16 = 4,
+    clock_div_32 = 5,
+    clock_div_64 = 6,
+    clock_div_128 = 7,
+    clock_div_256 = 8
+} clock_div_t;
+
+
+////////// ADC voltage / temperature //////////
+
+#define V_REF REFS1
+//#define VOLTAGE_ADC_DIDR DIDR0  // set this in hwdef
+
+// DS table 19-3, 19-4, 1.1V ref / VCC
+#define ADMUX_VCC 0b00001101
+// (1 << V_REF) | (THERM_CHANNEL)
+// DS table 19-3, 19-4, internal sensor / 1.1V ref
+#define ADMUX_THERM 0b10001110
+
+
+
+
+#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();
+
+// NOP because interrupt flag clears itself
+#define mcu_adc_vect_clear()
+
+inline uint16_t mcu_adc_result();
+
+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) //////////
+
+// set these in hwdef
+//#define SWITCH_PORT  PINA
+//#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();
+