Updated copyright headers.

This fixes a problem where the chip only seems to work after programming.

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "third_party/mbed"]
+	path = third_party/mbed
+	url = https://github.com/mbedmicro/mbed.git
+[submodule "third_party/lpcopen"]
+	path = third_party/lpcopen
+	url = juju:~/p/git/lpcopen2

CMakeLists.txt

@@ -0,0 +1,74 @@
+# Copyright 2015 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+cmake_minimum_required(VERSION 3.2)
+project(ser2neo C CXX ASM)
+
+set(LPCOPEN third_party/lpcopen)
+
+add_library(
+  lpcopen
+  ${LPCOPEN}/lpc_chip_8xx/src/acmp_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/chip_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/clock_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/crc_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/gpio_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/i2c_common_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/i2cm_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/i2cs_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/iap.c
+  ${LPCOPEN}/lpc_chip_8xx/src/iocon_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/irc_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/pinint_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/pmu_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/ring_buffer.c
+  ${LPCOPEN}/lpc_chip_8xx/src/sct_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/sct_pwm_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/spi_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/spim_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/spis_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/stopwatch_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/swm_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/syscon_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/sysinit_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/uart_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/wkt_8xx.c
+  ${LPCOPEN}/lpc_chip_8xx/src/wwdt_8xx.c
+  )
+
+set(MBED_LPC81X third_party/mbed/libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC81X)
+
+set(STARTUP ${MBED_LPC81X}/TOOLCHAIN_GCC_ARM/startup_LPC81X.S)
+set(LDSCRIPT ${MBED_LPC81X}/TARGET_LPC810/TOOLCHAIN_GCC_ARM/LPC810.ld)
+
+include_directories(
+  ${LPCOPEN}
+  ${LPCOPEN}/lpc_chip_8xx/inc
+  .
+  )
+
+add_executable(
+  ser2neo
+  ser2neo.cc
+  serial.cc
+  neopixel.cc
+  retarget.cc
+  ${STARTUP}
+  )
+
+target_link_libraries(ser2neo lpcopen)
+
+set(EXTRA_FLAGS "-Wall -Os -flto --specs=nano.specs --specs=nosys.specs -DCORE_M0PLUS -Wl,-T${CMAKE_SOURCE_DIR}/${LDSCRIPT},-gc-sections -fno-builtin-printf -fno-builtin-putchar -fno-builtin-puts -Wl,-Map,ser2neo.map,--cref")
+set(CMAKE_C_FLAGS "${COMMON_FLAGS} ${RUNTIME_FLAGS} ${EXTRA_FLAGS} -Wno-incompatible-pointer-types")
+set(CMAKE_CXX_FLAGS "${COMMON_FLAGS} ${RUNTIME_FLAGS} ${EXTRA_FLAGS} -fno-exceptions -fno-rtti -std=gnu++14 -save-temps=obj")

Makefile

@@ -1,16 +0,0 @@
-# Copyright 2015 Google Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-include attiny85.mk
-include avr.mk

attiny85.mk

@@ -1,16 +0,0 @@
-# Copyright 2015 Google Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-DEVICE     = attiny85
-CLOCK      = 16500000

avr.mk

@@ -1,47 +0,0 @@
-# Copyright 2015 Google Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-APP ?= $(notdir $(PWD))
-VERSION ?= $(shell date +%Y%m%d)+git$(shell git describe --always)
-
-SRC = $(wildcard *.cc)
-OBJ = $(SRC:%.cc=%.o)
-
-CROSS_COMPILE = avr-
-CC = $(CROSS_COMPILE)gcc
-CXX = $(CROSS_COMPILE)g++
-CFLAGS = -Os -DF_CPU=$(CLOCK) -mmcu=$(DEVICE) -Wall
-CXXFLAGS = $(CFLAGS) -std=gnu++1y
-
-all: $(APP).hex
-
-usb-flash: $(APP).hex
-	sudo $(HOME)/bin/micronucleus --run $<
-
-%.elf: $(OBJ)
-	$(CXX) $(CXXFLAGS) -o $@ $(OBJ)
-	$(CROSS_COMPILE)size -d $@
-
-%.hex: %.elf
-	avr-objcopy -j .text -j .data -O ihex $< $@
-
-clean:
-	rm -f $(APP).hex $(APP).elf $(OBJ) *~ *.ii
-
-dist:
-	rm -rf tmp
-	mkdir tmp
-	git archive --prefix=$(APP)-$(VERSION)/ HEAD | gzip > tmp/$(APP)-$(VERSION).tar.gz
-	cd tmp && git clone $$(readlink -f ..) $(APP)
-	$(MAKE) -C tmp/$(APP)

board.h

@@ -0,0 +1,19 @@
+// Copyright 2015 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#pragma once
+
+#define CONFIG_MAIN_FREQ 12'000'000
+#define CONFIG_SYS_FREQ  12'000'000

client/chroma_demo.py

@@ -20,7 +20,7 @@ import colorsys
 
 
 def main():
-    port = ser2neo.open_port('/dev/ttyUSB0')
+    port = ser2neo.open_port()
     neo = ser2neo.NeoPixels(port)
 
     offset = 0

client/clock_demo.py

@@ -23,7 +23,7 @@ def angle2idx(neo, angle, limit):
 
 
 def main():
-    port = ser2neo.open_port('/dev/ttyUSB0')
+    port = ser2neo.open_port()
     neo = ser2neo.NeoPixels(port)
 
     anim = ser2neo.Animator()

client/dice_demo.py

@@ -24,7 +24,7 @@ def angle2idx(neo, angle, limit):
 
 
 def main():
-    port = ser2neo.open_port('/dev/ttyUSB0')
+    port = ser2neo.open_port()
     neo = ser2neo.NeoPixels(port)
 
     random.seed()

client/green_spin_demo.py

@@ -18,7 +18,7 @@ import time
 
 
 def main():
-    port = ser2neo.open_port('/dev/ttyUSB0')
+    port = ser2neo.open_port()
     neo = ser2neo.NeoPixels(port)
 
     at = 0

client/ser2neo.py

@@ -16,6 +16,7 @@
 from __future__ import division
 
 import serial
+import serial.tools.list_ports
 import time
 import struct
 
@@ -33,18 +34,15 @@ class RGB:
 
     def __add__(self, other):
         """Componentwise addition."""
-        return RGB(*list(
-            _clip(x + y) for x, y in zip(self.rgb, other.rgb)))
+        return RGB(*list(_clip(x + y) for x, y in zip(self.rgb, other.rgb)))
 
     def __mul__(self, level):
         """Scalar multiplier."""
-        return RGB(*(
-            _clip(x * level) for x in self.rgb))
+        return RGB(*(_clip(x * level) for x in self.rgb))
 
     def __truediv__(self, level):
         """Scalar division."""
-        return RGB(*(
-            _clip(x / level) for x in self.rgb))
+        return RGB(*(_clip(x / level) for x in self.rgb))
 
     __div__ = __truediv__
 
@@ -64,17 +62,28 @@ class Colour:
 
 def _escape(buf):
     EOL, ESC = ord('\r'), ord('+')
+    special = set((EOL, ESC, ord('?')))
 
     for ch in buf:
-        if ch == EOL or ch == ESC:
+        if ch in special:
             yield ESC
             yield ch ^ ESC
         else:
             yield ch
 
 
-def open_port(name):
+def first_serial():
+    for info in serial.tools.list_ports.comports():
+        device = info[0]
+        if 'USB' in device or 'ACM' in device:
+            return device
+    return '/dev/ttyUSB0'
+
+
+def open_port(name=None):
     """Open the serial connection to the adaptor."""
+    if name is None:
+        name = first_serial()
     return serial.Serial(name, 57600, timeout=0.02)
 
 
@@ -108,8 +117,7 @@ class NeoPixels:
         buf = b'l'
         for rgb in self.leds:
             rgb = rgb * self.brightness
-            buf += struct.pack('BBB',
-                int(_clip(rgb.rgb[1] * 0xFF, 0xFF)),
+            buf += struct.pack('BBB', int(_clip(rgb.rgb[1] * 0xFF, 0xFF)),
                                int(_clip(rgb.rgb[0] * 0xFF, 0xFF)),
                                int(_clip(rgb.rgb[2] * 0xFF, 0xFF)))
         if str == bytes:

client/spin_demo.py

@@ -17,7 +17,7 @@ import ser2neo
 
 
 def main():
-    port = ser2neo.open_port('/dev/ttyUSB0')
+    port = ser2neo.open_port()
     neo = ser2neo.NeoPixels(port)
 
     p0 = 0

neopixel.cc

@@ -15,66 +15,82 @@
 // limitations under the License.
 //
 #include "neopixel.h"
-#include "serial.h"
+#include "chip.h"
 
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <string.h>
+#include <cstring>
+
+#define CFG_ENABLE          (1<<0)
+#define CFG_MASTER          (1<<2)
+
+const uint16_t NeoPixel::bits_[] = {
+    0b100100100100,
+    0b100100100110,
+    0b100100110100,
+    0b100100110110,
+    0b100110100100,
+    0b100110100110,
+    0b100110110100,
+    0b100110110110,
+    0b110100100100,
+    0b110100100110,
+    0b110100110100,
+    0b110100110110,
+    0b110110100100,
+    0b110110100110,
+    0b110110110100,
+    0b110110110110,
+};
 
-extern Serial serial;
 
 /// Initialise the hardware.
 void NeoPixel::init() {
-    DDRB |= _BV(1);
-    TCCR0A = _BV(WGM01) | _BV(WGM00) | _BV(COM0B1) | _BV(COM0B0);
-    TCCR0B = _BV(WGM02) | _BV(CS00);
+    clear();
     
-    static_assert(Reload > 15, "Inter-bit time is probably too short.");
-    OCR0A = Reload;
-    OCR0B = Low;
+    LPC_FMC->FLASHCFG = 0;            // 1 wait state instead of 1
+
+    LPC_SWM->PINENABLE0 |= 1<<2;            // disable SWCLK
+    LPC_SWM->PINASSIGN[4] = 0xFFFFFF03UL;     // SPI0_MOSI 3
+
+    /* Enable SPI0 clock */
+    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<11);
+    LPC_SYSCON->PRESETCTRL &= ~(1<<0);
+    LPC_SYSCON->PRESETCTRL |= (1<<0);
+
+    // 2.4 MHz, i.e. 12 MHz / 5
+    LPC_SPI0->DIV = 4;
+    LPC_SPI0->DLY = 0;
+
+    LPC_SPI0->TXCTRL = SPI_TXDATCTL_FLEN(12-1) | SPI_TXDATCTL_RXIGNORE;
+
+    LPC_SPI0->CFG = CFG_MASTER;
+    LPC_SPI0->CFG |= CFG_ENABLE;
 }
 
 /// Set all the LEDs to off and restart at the first LED.
 void NeoPixel::clear() {
-    p_ = bits_;
-    memset(bits_, Low, sizeof(bits_));
+    p_ = bytes_;
+    memset(bytes_, 0, sizeof(bytes_));
 }
 
 /// Append a byte to the stream.
 void NeoPixel::append(uint8_t b) {
-    if (p_ <= (bits_ + sizeof(bits_) - Tail - BitsPerColour)) {
-        for (auto i = 0; i < BitsPerColour; i++) {
-            *p_++ = (b & 0x80) ? High : Low;
-            b <<= 1;
-        }
+    if (p_ <= (bytes_ + sizeof(bytes_))) {
+        *p_++ = b;
     }
 }
 
+void NeoPixel::send(uint16_t cmd) {
+    while ((LPC_SPI0->STAT & SPI_STAT_TXRDY) == 0) {}
+    LPC_SPI0->TXDAT = cmd;
+}
+
 /// Write to the LEDs.
 void NeoPixel::write() {
-    bits_[sizeof(bits_) - 1] = Stop;
-
-    uint8_t *p = bits_;
-    uint8_t *pend = bits_ + sizeof(bits_);
-
-    cli();
-
-    OCR0B = Stop;
-    TIFR |= _BV(OCF0A);
-    while (!(TIFR & _BV(OCF0A))) {
+    send(0);
+    send(0);
+    for (auto p = bytes_; p < bytes_ + sizeof(bytes_); p++) {
+        auto ch = *p;
+        send(bits_[ch >> 4]);
+        send(bits_[ch & 0xF]);
     }
-    TIFR |= _BV(OCF0A);
-    while (!(TIFR & _BV(OCF0A))) {
-    }
-    OCR0B = *p++;
-
-    for (; p != pend; p++) {
-        while (!(TIFR & _BV(OCF0A))) {
-        }
-        OCR0B = *p;
-        TIFR |= _BV(OCF0A);
-    }
-    OCR0B = Stop;
-
-    sei();
 }

neopixel.h

@@ -35,15 +35,11 @@ class NeoPixel {
    private:
     static const int MaxLEDs = 16;
 
-    static const int BitsPerColour = 8;
     static const int ColoursPerLED = 3;
-    static const int Tail = 2;
     
-    static const uint8_t Reload = F_CPU / 800000;
-    static const uint8_t Low = Reload * 2 / 3;
-    static const uint8_t High = Reload - Low;
-    static const uint8_t Stop = 0xFF;
+    void send(uint16_t ch);
     
     uint8_t* p_;
-    uint8_t bits_[MaxLEDs * ColoursPerLED * BitsPerColour + Tail];
+    uint8_t bytes_[MaxLEDs * ColoursPerLED];
+    static const uint16_t bits_[];
 };

retarget.cc

@@ -0,0 +1,21 @@
+// Copyright 2015 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "chip.h"
+
+extern "C" void _exit(int code) {
+    for (;;) {
+        __WFI();
+    }
+}

ser2neo.cc

@@ -14,7 +14,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-#include <avr/interrupt.h>
 #include <string.h>
 
 #include "neopixel.h"
@@ -43,6 +42,22 @@ class Ser2Neo {
     Serial serial;
 };
 
+extern "C" void SystemInit() {
+    Chip_SYSCTL_PowerUp(SYSCTL_SLPWAKE_IRC_PD);
+    Chip_Clock_SetSystemPLLSource(SYSCTL_PLLCLKSRC_IRC);
+    Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_IRC);
+    Chip_FMC_SetFLASHAccess(FLASHTIM_20MHZ_CPU);
+
+    Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
+    Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);
+
+    Chip_SWM_DisableFixedPin(SWM_FIXED_SWCLK);
+    Chip_SWM_DisableFixedPin(SWM_FIXED_SWDIO);
+
+    Chip_SWM_MovablePinAssign(SWM_U0_TXD_O, 4);
+    Chip_SWM_MovablePinAssign(SWM_U0_RXD_I, 0);
+}
+
 /// Initialise the hardware.
 void Ser2Neo::init() {
     leds.init();
@@ -96,8 +111,6 @@ void Ser2Neo::send_ok(const char* msg) {
 
 /// Run the main loop.  Process and run commands.
 void Ser2Neo::run() {
-    sei();
-
     serial.putstr("READY\n");
 
     for (;;) {
@@ -123,11 +136,11 @@ void Ser2Neo::run() {
     }
 }
 
-static Ser2Neo ser2led;
+static Ser2Neo ser2neo;
 
 int main() {
-    ser2led.init();
-    ser2led.run();
+    ser2neo.init();
+    ser2neo.run();
 
     return 0;
 }

serial.cc

@@ -1,4 +1,4 @@
-// Half-duplex interrupt based serial port.
+// Blocking serial port.
 //
 // Copyright 2015 Google Inc.
 //
@@ -16,107 +16,32 @@
 //
 #include "serial.h"
 
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <avr/sleep.h>
-
-Serial* Serial::instance_;
-
-#define _clear(port, pin) port &= ~_BV(pin)
-#define _set(port, pin) port |= _BV(pin)
+#include "board.h"
 
 /// Initialise the hardware.
 void Serial::init() {
-    state_ = Idle;
-    rx_full_ = false;
+    Chip_UART_Init(LPC_USART0);
+    Chip_Clock_SetUARTClockDiv(ClockDiv);
 
-    instance_ = this;
+    handle_ = LPC_UARTD_API->uart_setup(
+        LPC_USART0_BASE, static_cast<uint8_t*>(static_cast<void*>(mem_)));
 
-    // Set up the GPIOs.
-    _set(DDRB, TxPin);
-    _set(PORTB, TxPin);
-    _clear(DDRB, RxPin);
+    UART_CONFIG_T cfg = {
+        .sys_clk_in_hz = CONFIG_SYS_FREQ / ClockDiv,
+        .baudrate_in_hz = 115200,
+        .config = 1,
+        .sync_mod = 0,
+        .error_en = NO_ERR_EN,
+    };
 
-    // Set up the timer.
-    static_assert(BitTime > 50, "BitTime is too short");
-    static_assert(BitTime < 255*2/3, "BitTime may overflow");
-    OCR1C = BitTime;
-    TCCR1 = _BV(CTC1) | _BV(PWM1A);
-
-    static_assert(Prescale == 2, "Mismatched prescaler");
-    TCCR1 |= _BV(CS11);
-
-    // Set up the pin change interrupt.
-    PCMSK = _BV(RxPin);
-    _set(GIMSK, PCIE);
-}
-
-/// Handle the pin change interrupt by starting receive.
-void Serial::pcint0() {
-    _clear(PCMSK, RxPin);
-    _clear(TIMSK, TOV1);  // PENDING
-
-    OCR1C = (BitTime / 2 * 3) - (PCIntDelay / Prescale);
-    TCNT1 = 0;
-    _set(TIFR, TOV1);
-
-    state_ = Receive;
-    bits_ = 8;
-
-    _set(TIMSK, TOV1);
-}
-
-/// Handle the timer overflow interrupt by doing the next bit.
-inline void Serial::timer1ovf() {
-    switch (state_) {
-        case Receive: {
-            auto got = PINB;
-            OCR1C = BitTime;
-            if (bits_ > 0) {
-                rxing_ >>= 1;
-                if (got & _BV(RxPin)) {
-                    rxing_ |= 0x80;
-                }
-                bits_--;
-            } else {
-                state_ = Idle;
-                rxed_ = rxing_;
-                rx_full_ = true;
-            }
-            break;
-        }
-        case Transmit:
-            if (txing_ & 1) {
-                _set(PORTB, TxPin);
-            } else {
-                _clear(PORTB, TxPin);
-            }
-            txing_ >>= 1;
-            if (--bits_ == 0) {
-                state_ = Idle;
-            }
-            break;
-        default:
-            break;
-    }
-
-    if (state_ == Idle) {
-        _clear(TIMSK, TOV1);
-        _set(PCMSK, RxPin);
-    }
+    auto frg = LPC_UARTD_API->uart_init(handle_, &cfg);
+    Chip_SYSCTL_SetUSARTFRGDivider(0xFF);
+    Chip_SYSCTL_SetUSARTFRGMultiplier(frg);
 }
 
 /// Wait until the hardware is free then start the transmit.
 void Serial::putch(uint8_t ch) {
-    while (state_ != Idle) {
-        sleep_cpu();
-    }
-    state_ = Transmit;
-    txing_ = (ch << 1) | 0xFE00;
-    bits_ = 10;
-
-    TCNT1 = 0;
-    _set(TIMSK, TOV1);
+    LPC_UARTD_API->uart_put_char(handle_, ch);
 }
 
 /// Send a string.
@@ -128,18 +53,5 @@ void Serial::putstr(const char* str) {
 
 /// Wait until a character is received, then return it.
 uint8_t Serial::getch() {
-    while (!rx_full_) {
-        sleep_cpu();
-    }
-    uint8_t ch = rxed_;
-    rx_full_ = false;
-    return ch;
+    return LPC_UARTD_API->uart_get_char(handle_);
 }
-
-inline void Serial::pcint0_bounce() { instance_->pcint0(); }
-
-inline void Serial::timer1ovf_bounce() { instance_->timer1ovf(); }
-
-ISR(TIMER1_OVF_vect) { Serial::timer1ovf_bounce(); }
-
-ISR(PCINT0_vect) { Serial::pcint0_bounce(); }

serial.h

@@ -1,4 +1,4 @@
-// Half-duplex interrupt based serial port.
+// Blocking serial port.
 //
 // Copyright 2015 Google Inc.
 //
@@ -18,9 +18,9 @@
 
 #include <stdint.h>
 
-/// Half-duplex interrupt based serial port.
-///
-/// Loosely based on AVR304.
+#include "chip.h"
+
+/// Blocking serial port.
 ///
 class Serial {
    public:
@@ -32,41 +32,8 @@ class Serial {
     uint8_t getch();
 
    private:
-    enum State : uint8_t {
-        Idle,
-        Receive,
-        Transmit,
-    };
+    static const int ClockDiv = 1;
 
-    // Note that these are all specific to an ATTINY85 USB board.
-    static const int RxPin = 0;
-    static const int TxPin = 2;
-
-    static const auto Prescale = 2;
-    static const auto Baud = 57600;
-    static const auto BitTime = F_CPU / Prescale / Baud - 1;
-    // Total number of clocks taken to service the pin change
-    // interrupt and start the receive.  Use this to reduce the first
-    // bit-and-a-half time so sampling occurs half way through the
-    // first bit.
-    static const uint8_t PCIntDelay = 140;
-
-    void pcint0();
-    void timer1ovf();
-
-    volatile State state_;
-    uint8_t rxing_;
-    // Remaining number of bits to send or receive.
-    uint8_t bits_;
-    volatile uint8_t rxed_;
-    volatile bool rx_full_;
-
-    volatile uint16_t txing_;
-
-    static Serial* instance_;
-
-   public:
-    // Interrupt handler entry points.
-    static void pcint0_bounce();
-    static void timer1ovf_bounce();
+    uint32_t mem_[40 / sizeof(uint32_t)];
+    UART_HANDLE_T* handle_;
 };

third_party/lpcopen

@@ -0,0 +1 @@
+Subproject commit 478fc8fe6087ec8c9eebff491f0324c8dd38db87

third_party/mbed

@@ -0,0 +1 @@
+Subproject commit 216fca1081a128e31a6a0b6683f6fe6f511ba647