6 files changed, 344 insertions, 0 deletions
diff --git a/src/arch/blinkenrocket/Makefile.inc b/src/arch/blinkenrocket/Makefile.inc
new file mode 100644
index 0000000..1d99d0b
--- /dev/null
+++ b/src/arch/blinkenrocket/Makefile.inc
@@ -0,0 +1,55 @@
+# vim:ft=make
+
+MCU = attiny88
+PORT = /dev/ttyUSB0
+
+COMMON_FLAGS += -mmcu=${MCU} -DF_CPU=8000000UL -DMULTIPASS_ARCH_blinkenrocket
+COMMON_FLAGS += -flto
+COMMON_FLAGS += -DMULTIPASS_ARCH_HAS_I2C
+
+CC = avr-gcc
+CXX = avr-g++
+NM = avr-nm
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+
+ifeq (${aspectc}, 1)
+	CXX = ag++ -r build/repo.acp -v 0 --c_compiler avr-g++ -p . --Xcompiler
+endif
+
+TARGETS += src/arch/blinkenrocket/arch.cc
+TARGETS += src/arch/blinkenrocket/driver/gpio.cc
+TARGETS += src/arch/blinkenrocket/driver/stdout.cc
+TARGETS += src/arch/blinkenrocket/driver/uptime.cc
+
+ifneq ($(findstring softi2c,${drivers}), )
+else ifneq ($(findstring i2c,${arch_drivers}), )
+	TARGETS += src/arch/blinkenrocket/driver/i2c.cc
+endif
+
+OBJECTS = ${TARGETS:.cc=.o}
+
+.cc.o:
+	${CXX} ${INCLUDES} ${COMMON_FLAGS} ${CXXFLAGS} -c -o $@ ${@:.o=.cc}
+
+build/system.elf: ${OBJECTS}
+	${CXX} ${COMMON_FLAGS} ${CXXFLAGS} -Wl,--gc-sections -o $@ ${OBJECTS}
+	avr-size --format=avr --mcu=${MCU} $@
+
+build/system.hex: build/system.elf
+	${OBJCOPY} -O ihex ${@:.hex=.elf} $@
+
+program: build/system.hex
+	avrdude -p ${MCU} -c usbasp -U flash:w:build/system.hex
+
+arch_clean:
+	rm -f ${OBJECTS} build/system.hex
+
+monitor:
+	screen ${PORT} 115200
+
+arch_help:
+	@echo "blinkenrocket specific flags:"
+	@echo "    PORT = ${PORT}"
+
+.PHONY: arch_clean arch_help monitor program
diff --git a/src/arch/blinkenrocket/arch.cc b/src/arch/blinkenrocket/arch.cc
new file mode 100644
index 0000000..8042679
--- /dev/null
+++ b/src/arch/blinkenrocket/arch.cc
@@ -0,0 +1,85 @@
+#include "arch.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+void Arch::setup(void)
+{
+#ifdef TIMER_CYCLES
+	TCCR0A = _BV(CS00);
+#endif
+
+#if defined(WITH_LOOP) || defined(TIMER_S)
+	TCCR1A = 0;
+	TCCR1B = _BV(WGM12) | _BV(CS12) | _BV(CS10); // /1024
+	OCR1A = F_CPU / 1024;
+	TIMSK1 = _BV(OCIE1A);
+#endif
+
+/*
+#ifdef TIMER_US
+	// 16MHz/8 -> 2MHz timer
+	TCCR1A = 0;
+	TCCR2B = _BV(CS21);
+#endif
+*/
+	sei();
+}
+
+#ifdef WITH_WAKEUP
+void wakeup();
+#endif
+
+#if defined(WITH_LOOP) || defined(TIMER_S)
+
+#include "driver/uptime.h"
+void loop();
+
+#endif
+
+void Arch::idle_loop(void)
+{
+	while (1) {
+		SMCR = _BV(SE);
+		asm("sleep");
+		SMCR = 0;
+		asm("wdr");
+#ifdef WITH_LOOP
+		loop();
+#endif
+#ifdef WITH_WAKEUP
+		wakeup();
+#endif
+#ifdef TIMER_S
+		uptime.tick_s();
+#endif
+	}
+}
+
+void Arch::idle(void)
+{
+	SMCR = _BV(SE);
+	asm("sleep");
+	SMCR = 0;
+	asm("wdr");
+}
+
+void Arch::delay_us(unsigned char const us)
+{
+	_delay_us(us);
+}
+
+void Arch::delay_ms(unsigned char const ms)
+{
+	_delay_ms(ms);
+}
+
+Arch arch;
+
+#if defined(WITH_LOOP) || defined(TIMER_S)
+
+ISR(TIMER1_COMPA_vect)
+{
+}
+
+#endif
diff --git a/src/arch/blinkenrocket/driver/gpio.cc b/src/arch/blinkenrocket/driver/gpio.cc
new file mode 100644
index 0000000..707f2bd
--- /dev/null
+++ b/src/arch/blinkenrocket/driver/gpio.cc
@@ -0,0 +1,17 @@
+#include "driver/gpio.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+GPIO gpio;
+
+ISR(PCINT0_vect)
+{
+}
+
+ISR(PCINT1_vect)
+{
+}
+
+ISR(PCINT2_vect)
+{
+}
diff --git a/src/arch/blinkenrocket/driver/i2c.cc b/src/arch/blinkenrocket/driver/i2c.cc
new file mode 100644
index 0000000..cfbea59
--- /dev/null
+++ b/src/arch/blinkenrocket/driver/i2c.cc
@@ -0,0 +1,149 @@
+#include "driver/i2c.h"
+#include "arch.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+inline void await_twint(unsigned char twcr_values)
+{
+	TWCR = twcr_values | _BV(TWINT) | _BV(TWIE);
+	while (!(TWCR & _BV(TWINT))) {
+		arch.idle();
+	}
+}
+
+/*
+ * Send an I2C (re)start condition and the EEPROM address in read mode. Returns
+ * after it has been transmitted successfully.
+ */
+static signed char i2c_start_read(unsigned char addr)
+{
+	await_twint(_BV(TWSTA) | _BV(TWEN));
+	if (!(TWSR & 0x18)) // 0x08 == START ok, 0x10 == RESTART ok
+		return -1;
+
+	// Note: The R byte ("... | 1") causes the TWI momodule to switch to
+	// Master Receive mode
+	TWDR = (addr << 1) | 1;
+	await_twint(_BV(TWEN));
+	if (TWSR != 0x40) // 0x40 == SLA+R transmitted, ACK receveid
+		return -2;
+
+	return 0;
+}
+
+/*
+ * Send an I2C (re)start condition and the EEPROM address in write mode.
+ * Returns after it has been transmitted successfully.
+ */
+static signed char i2c_start_write(unsigned char addr)
+{
+	await_twint(_BV(TWSTA) | _BV(TWEN));
+	if (!(TWSR & 0x18)) // 0x08 == START ok, 0x10 == RESTART ok
+		return -1;
+
+	TWDR = (addr<< 1) | 0;
+	await_twint(_BV(TWEN));
+	if (TWSR != 0x18) // 0x18 == SLA+W transmitted, ACK received
+		return -2;
+
+	return 0;
+}
+
+/*
+ * Send an I2C stop condition.
+ */
+static signed char i2c_stop()
+{
+	TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
+}
+
+/*
+ * Sends len bytes to the EEPROM. Note that this method does NOT
+ * send I2C start or stop conditions.
+ */
+static signed char i2c_send(uint8_t len, uint8_t *data)
+{
+	uint8_t pos = 0;
+
+	for (pos = 0; pos < len; pos++) {
+		TWDR = data[pos];
+		await_twint(_BV(TWEN));
+		if (TWSR != 0x28) // 0x28 == byte transmitted, ACK received
+			return pos;
+	}
+
+	return pos;
+}
+
+/*
+ * Receives len bytes from the EEPROM into data. Note that this method does
+ * NOT send I2C start or stop conditions.
+ */
+static signed char i2c_receive(uint8_t len, uint8_t *data)
+{
+	uint8_t pos = 0;
+
+	for (pos = 0; pos < len; pos++) {
+		await_twint(_BV(TWEN) | ( _BV(TWEA) * (pos < len-1) ) );
+		data[pos] = TWDR;
+		/*
+		 * No error handling here -- We send the acks, the EEPROM only
+		 * supplies raw data, so there's no way of knowing whether it's still
+		 * talking to us or we're just reading garbage.
+		 */
+	}
+
+	return pos;
+}
+
+signed char I2C::setup()
+{
+	TWSR = 0;
+	TWBR = ((F_CPU / 100000UL) - 16) / 2;
+
+	return 0;
+}
+
+void I2C::scan(unsigned int *results)
+{
+	for (unsigned char address = 0; address < 128; address++) {
+		if (i2c_start_read(address) == 0) {
+			results[address / (8 * sizeof(unsigned int))] |= 1 << (address % (8 * sizeof(unsigned int)));
+			i2c_stop();
+		}
+	}
+	i2c_stop();
+}
+
+signed char I2C::xmit(unsigned char address,
+		unsigned char tx_len, unsigned char *tx_buf,
+		unsigned char rx_len, unsigned char *rx_buf)
+{
+	unsigned char i;
+
+	if (tx_len) {
+		if (i2c_start_write(address) < 0) {
+			return -1;
+		}
+		if (i2c_send(tx_len, tx_buf) < 0) {
+			return -1;
+		}
+	}
+	if (rx_len) {
+		if (i2c_start_read(address) < 0) {
+			return -1;
+		}
+		if (i2c_receive(rx_len, rx_buf) < 0) {
+			return -1;
+		}
+	}
+
+	i2c_stop();
+	return 0;
+}
+
+I2C i2c;
+
+ISR(TWI_vect)
+{
+}
diff --git a/src/arch/blinkenrocket/driver/stdout.cc b/src/arch/blinkenrocket/driver/stdout.cc
new file mode 100644
index 0000000..961cf46
--- /dev/null
+++ b/src/arch/blinkenrocket/driver/stdout.cc
@@ -0,0 +1,35 @@
+#include "driver/stdout.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+void StandardOutput::setup()
+{
+	PORTC |= _BV(PC1);
+	DDRC |= _BV(DDC1);
+}
+
+void StandardOutput::put(char c)
+{
+	unsigned char i = 1;
+	PORTC &= ~_BV(PC1);
+	__builtin_avr_delay_cycles(59);
+	while (i < 0x80) {
+		if (c & i) {
+			PORTC |= _BV(PC1);
+		} else {
+			PORTC &= ~_BV(PC1);
+		}
+		i <<= 1;
+		__builtin_avr_delay_cycles(54);
+	}
+	__builtin_avr_delay_cycles(6);
+	PORTC &= ~_BV(PC1);
+	__builtin_avr_delay_cycles(67);
+	PORTC |= _BV(PC1);
+	__builtin_avr_delay_cycles(150);
+	if (c == '\n') {
+		put('\r');
+	}
+}
+
+StandardOutput kout;
diff --git a/src/arch/blinkenrocket/driver/uptime.cc b/src/arch/blinkenrocket/driver/uptime.cc
new file mode 100644
index 0000000..388edb6
--- /dev/null
+++ b/src/arch/blinkenrocket/driver/uptime.cc
@@ -0,0 +1,3 @@
+#include "driver/uptime.h"
+
+Uptime uptime;