5 files changed, 308 insertions, 0 deletions
diff --git a/src/arch/lora32u4ii/Makefile.inc b/src/arch/lora32u4ii/Makefile.inc
new file mode 100644
index 0000000..06ac1f9
--- /dev/null
+++ b/src/arch/lora32u4ii/Makefile.inc
@@ -0,0 +1,121 @@
+# vim:ft=make
+#
+# Copyright 2021 Daniel Friesel
+#
+# SPDX-License-Identifier: BSD-2-Clause
+
+MCU = atmega32u4
+SERIAL_PORT ?= /dev/ttyUSB0
+
+ifdef CONFIG_arch_lora32u4ii_cpufreq
+	cpu_freq = ${CONFIG_arch_lora32u4ii_cpufreq}
+endif
+
+cpu_freq ?= 8000000
+
+COMMON_FLAGS += -Werror=overflow
+COMMON_FLAGS += -mmcu=${MCU} -DMULTIPASS_ARCH_lora32u4ii
+COMMON_FLAGS += -DF_CPU=${cpu_freq}UL
+COMMON_FLAGS += -DMULTIPASS_ARCH_HAS_I2C
+
+ifeq (${stack_usage}, )
+	COMMON_FLAGS += -flto
+endif
+
+CC = avr-gcc
+CXX = avr-g++
+NM = avr-nm
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+
+ARCH_SHORTNAME = avr
+
+ifeq (${aspectc}, 1)
+	CXX = ag++ -r build/repo.acp -v 0 --c_compiler avr-g++ -p . --Xcompiler
+endif
+
+CXX_TARGETS += src/arch/lora32u4ii/arch.cc
+CXX_TARGETS += src/arch/lora32u4ii/driver/gpio.cc
+CXX_TARGETS += src/arch/lora32u4ii/driver/stdout.cc
+
+# Command-line driver selection
+
+ifeq (${timer_s}, 1)
+	CONFIG_arch_lora32u4ii_driver_uptime = y
+endif
+
+# Kconfig driver selection
+
+ifdef CONFIG_arch_lora32u4ii_driver_uptime
+	COMMON_FLAGS += -DTIMER_S
+	CXX_TARGETS += src/arch/lora32u4ii/driver/uptime.cc
+endif
+
+ifeq (${cpu_freq}, 8000000)
+	uart_baud = 19200
+else ifeq (${cpu_freq}, 4000000)
+	uart_baud = 19200
+else ifeq (${cpu_freq}, 2000000)
+	uart_baud = 19200
+else ifeq (${cpu_freq}, 1000000)
+	uart_baud = 9600
+else ifeq (${cpu_freq}, 500000)
+	uart_baud = 4800
+else ifeq (${cpu_freq}, 250000)
+	uart_baud = 2400
+else ifeq (${cpu_freq}, 125000)
+	uart_baud = 1200
+else ifeq (${cpu_freq}, 62500)
+	uart_baud = 300
+else
+	uart_baud = 9600
+endif
+
+COMMON_FLAGS += -DBAUD=${uart_baud}UL
+
+OBJECTS = ${CXX_TARGETS:.cc=.o} ${C_TARGETS:.c=.o}
+
+%.o : %.cc | include/config.h
+	${QUIET}${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} -c -o $@ ${@:.o=.cc}
+
+%.o : %.c | include/config.h
+	${QUIET}${CC} ${INCLUDES} ${COMMON_FLAGS} ${CFLAGS} -c -o $@ ${@:.o=.c}
+
+build/system.elf: ${OBJECTS}
+	${QUIET}mkdir -p build
+	${QUIET}${CXX} ${COMMON_FLAGS} ${CXXFLAGS} -Wl,--gc-sections -o $@ ${OBJECTS}
+	${QUIET}avr-size --format=avr --mcu=${MCU} $@
+	${QUIET}test $$(avr-size --format=avr --mcu=${MCU} build/system.elf | fgrep Program | grep -o '[0-9.]*%' | cut -d . -f 1) -lt 100
+
+build/system.hex: build/system.elf
+	${QUIET}${OBJCOPY} -O ihex ${@:.hex=.elf} $@
+
+program: build/system.hex
+	${QUIET}avrdude -p ${MCU} -c usbasp -U flash:w:build/system.hex
+
+arch_clean:
+	${QUIET}rm -f ${OBJECTS} build/system.hex
+
+cat:
+	${QUIET}script/cat.py ${SERIAL_PORT} ${uart_baud} ${cpu_freq} 65536
+
+monitor:
+	${QUIET}screen ${SERIAL_PORT} ${uart_baud}
+
+size: build/system.elf
+	${QUIET}avr-size --format=avr --mcu=${MCU} build/system.elf | fgrep Program | perl -nE 'if (m{(\d+) bytes \(([0-9.]+%)}) { print("$$1;$$2;") }'
+	${QUIET}avr-size --format=avr --mcu=${MCU} build/system.elf | fgrep Data | perl -nE 'if (m{(\d+) bytes \(([0-9.]+%)}) { print("$$1;$$2;") }'
+	${QUIET}echo
+
+arch_help:
+	@echo "lora32u4ii specific flags:"
+	@echo " SERIAL_PORT = ${SERIAL_PORT}"
+
+arch_info:
+	@echo "CPU   Freq: ${cpu_freq} Hz"
+	@echo "Timer Freq: ${timer_freq} Hz"
+	@echo "I2C   Freq: ${i2c_freq} Hz"
+	@echo "Counter Overflow: 65536/255"
+	@echo "Monitor: ${SERIAL_PORT} ${uart_baud}"
+
+.PHONY: arch_clean arch_help arch_info monitor program
diff --git a/src/arch/lora32u4ii/arch.cc b/src/arch/lora32u4ii/arch.cc
new file mode 100644
index 0000000..aa5c288
--- /dev/null
+++ b/src/arch/lora32u4ii/arch.cc
@@ -0,0 +1,123 @@
+#include "arch.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/wdt.h>
+#include <util/delay.h>
+
+void Arch::setup(void)
+{
+	wdt_disable();
+
+#if F_CPU == 8000000UL
+	/* default */
+#elif F_CPU == 4000000UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS0);
+#elif F_CPU == 2000000UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS1);
+#elif F_CPU == 1000000UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS1) | _BV(CLKPS0);
+#elif F_CPU == 500000UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS2);
+#elif F_CPU == 250000UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS2) | _BV(CLKPS0);
+#elif F_CPU == 125000UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS2) | _BV(CLKPS1);
+#elif F_CPU == 62500UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS2) | _BV(CLKPS1) | _BV(CLKPS0);
+#elif F_CPU == 32150UL
+	CLKPR = _BV(CLKPCE);
+	CLKPR = _BV(CLKPS3);
+#else
+#error Unsupported F_CPU
+#endif
+
+#if defined(CONFIG_loop) || defined(TIMER_S)
+	TCCR1A = 0;
+	TCCR1B = _BV(WGM12) | _BV(CS12) | _BV(CS10); // CTC, /1024
+	OCR1A = F_CPU / 1024;
+	TIMSK1 = _BV(OCIE1A);
+#endif
+
+	sei();
+}
+
+#ifdef CONFIG_wakeup
+void wakeup();
+#endif
+
+#if defined(CONFIG_loop) || defined(TIMER_S)
+
+#include "driver/uptime.h"
+
+#endif
+
+#if defined(CONFIG_loop)
+extern void loop();
+volatile char run_loop = 0;
+#endif
+
+void Arch::idle_loop(void)
+{
+	while (1) {
+		SMCR = _BV(SE);
+		asm("sleep");
+		SMCR = 0;
+		asm("wdr");
+#ifdef CONFIG_loop
+		if (run_loop) {
+			loop();
+			run_loop = 0;
+		}
+#endif
+#ifdef CONFIG_wakeup
+		wakeup();
+#endif
+	}
+}
+
+void Arch::idle(void)
+{
+	SMCR = _BV(SE);
+	asm("sleep");
+	SMCR = 0;
+	asm("wdr");
+}
+
+void Arch::delay_us(unsigned int const us)
+{
+	for (unsigned int i = 0; i < us; i++) {
+		_delay_us(1);
+	}
+}
+
+void Arch::delay_ms(unsigned int const ms)
+{
+	for (unsigned int i = 0; i < ms; i++) {
+		_delay_ms(1);
+	}
+}
+
+Arch arch;
+
+#if defined(CONFIG_loop) || defined(TIMER_S)
+
+#ifndef __acweaving
+ISR(TIMER1_COMPA_vect)
+{
+#ifdef CONFIG_loop
+	run_loop = 1;
+#endif
+#ifdef TIMER_S
+	uptime.tick_s();
+#endif
+}
+#endif
+
+#endif
diff --git a/src/arch/lora32u4ii/driver/gpio.cc b/src/arch/lora32u4ii/driver/gpio.cc
new file mode 100644
index 0000000..2e3eb1d
--- /dev/null
+++ b/src/arch/lora32u4ii/driver/gpio.cc
@@ -0,0 +1,25 @@
+#include "driver/gpio.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+GPIO gpio;
+
+#ifndef __acweaving
+/*
+ISR(PCINT0_vect)
+{
+}
+*/
+
+/*
+ISR(PCINT1_vect)
+{
+}
+*/
+
+/*
+ISR(PCINT2_vect)
+{
+}
+*/
+#endif
diff --git a/src/arch/lora32u4ii/driver/stdout.cc b/src/arch/lora32u4ii/driver/stdout.cc
new file mode 100644
index 0000000..afe6ff8
--- /dev/null
+++ b/src/arch/lora32u4ii/driver/stdout.cc
@@ -0,0 +1,36 @@
+#include "driver/stdout.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#ifndef BAUD
+#define BAUD 9600UL
+#endif
+
+#include <util/setbaud.h>
+
+void StandardOutput::setup()
+{
+	UBRR1H = UBRRH_VALUE;
+	UBRR1L = UBRRL_VALUE;
+
+#if USE_2X
+	UCSR1A |= _BV(U2X1);
+#else
+	UCSR1A &= ~_BV(U2X1);
+#endif
+
+	UCSR1B |= _BV(RXEN1) | _BV(TXEN1);
+	UCSR1C = _BV(UCSZ11) | _BV(UCSZ10); // async UART, 8N1
+	//UCSR1D = 0;
+}
+
+void StandardOutput::put(char c)
+{
+	while (!(UCSR1A & _BV(UDRE1)));
+	UDR1 = c;
+	if (c == '\n') {
+		put('\r');
+	}
+}
+
+StandardOutput kout;
diff --git a/src/arch/lora32u4ii/driver/uptime.cc b/src/arch/lora32u4ii/driver/uptime.cc
new file mode 100644
index 0000000..388edb6
--- /dev/null
+++ b/src/arch/lora32u4ii/driver/uptime.cc
@@ -0,0 +1,3 @@
+#include "driver/uptime.h"
+
+Uptime uptime;