Merge branch 'rn42' into merge_rn42

Conflicts:
	.gitignore
	common.mk
	common/debug_config.h
	common/print.h

11 files changed, 546 insertions, 66 deletions

diff --git a/protocol/lufa/lufa.c b/protocol/lufa/lufa.c
index 16a602df1..6802f3b63 100644
--- a/protocol/lufa/lufa.c
+++ b/protocol/lufa/lufa.c
@@ -148,10 +148,23 @@ static void Console_Task(void)
 */
 void EVENT_USB_Device_Connect(void)
 {
+    /* For battery powered device */
+    if (!USB_IsInitialized) {
+        USB_Init();
+        USB_Device_EnableSOFEvents();
+    }
 }
 
 void EVENT_USB_Device_Disconnect(void)
 {
+    /* For battery powered device */
+/* TODO: This doesn't work. After several plug in/outs can not be enumerated. 
+    if (USB_IsInitialized) {
+        USB_Disable();  // Disable all interrupts
+        USB_Controller_Enable();
+        USB_INT_Enable(USB_INT_VBUSTI);
+    }
+*/
 }
 
 void EVENT_USB_Device_Reset(void)
@@ -574,7 +587,7 @@ int main(void)
     print("Keyboard start.\n");
     while (1) {
         while (USB_DeviceState == DEVICE_STATE_Suspended) {
-            suspend_power_down();
+            suspend_power_down(WDTO_120MS);
             if (USB_Device_RemoteWakeupEnabled && suspend_wakeup_condition()) {
                     USB_Device_SendRemoteWakeup();
             }
diff --git a/protocol/mbed/HIDKeyboard.cpp b/protocol/mbed/HIDKeyboard.cpp
new file mode 100644
index 000000000..947077cd2
--- /dev/null
+++ b/protocol/mbed/HIDKeyboard.cpp
@@ -0,0 +1,271 @@
+#include <stdint.h>
+#include "USBHID.h"
+#include "USBHID_Types.h"
+#include "USBDescriptor.h"
+#include "HIDKeyboard.h"
+
+#define DEFAULT_CONFIGURATION (1)
+
+
+HIDKeyboard::HIDKeyboard(uint16_t vendor_id, uint16_t product_id, uint16_t product_release): USBDevice(vendor_id, product_id, product_release)
+{
+    USBDevice::connect();
+}
+
+bool HIDKeyboard::sendReport(report_keyboard_t report) {
+    USBDevice::write(EP1IN, report.raw, sizeof(report), MAX_PACKET_SIZE_EP1);
+    return true;
+}
+
+uint8_t HIDKeyboard::leds() {
+    return led_state;
+}
+
+bool HIDKeyboard::USBCallback_setConfiguration(uint8_t configuration) {
+    if (configuration != DEFAULT_CONFIGURATION) {
+        return false;
+    }
+
+    // Configure endpoints > 0
+    addEndpoint(EPINT_IN, MAX_PACKET_SIZE_EPINT);
+    //addEndpoint(EPINT_OUT, MAX_PACKET_SIZE_EPINT);
+
+    // We activate the endpoint to be able to recceive data
+    //readStart(EPINT_OUT, MAX_PACKET_SIZE_EPINT);
+    return true;
+}
+
+
+uint8_t * HIDKeyboard::stringImanufacturerDesc() {
+    static uint8_t stringImanufacturerDescriptor[] = {
+        0x18,                                            /*bLength*/
+        STRING_DESCRIPTOR,                               /*bDescriptorType 0x03*/
+        't',0,'m',0,'k',0,'-',0,'k',0,'b',0,'d',0,'.',0,'c',0,'o',0,'m',0   /*bString iManufacturer*/
+    };
+    return stringImanufacturerDescriptor;
+}
+
+uint8_t * HIDKeyboard::stringIproductDesc() {
+    static uint8_t stringIproductDescriptor[] = {
+        0x0a,                                                       /*bLength*/
+        STRING_DESCRIPTOR,                                          /*bDescriptorType 0x03*/
+        'm',0,'b',0,'e',0,'d',0                                     /*bString iProduct*/
+    };
+    return stringIproductDescriptor;
+}
+
+uint8_t * HIDKeyboard::stringIserialDesc() {
+    static uint8_t stringIserialDescriptor[] = {
+        0x04,                                                           /*bLength*/
+        STRING_DESCRIPTOR,                                              /*bDescriptorType 0x03*/
+        '0',0                                                           /*bString iSerial*/
+    };
+    return stringIserialDescriptor;
+}
+
+uint8_t * HIDKeyboard::reportDesc() {
+    static uint8_t reportDescriptor[] = {
+        USAGE_PAGE(1), 0x01,                    // Generic Desktop
+        USAGE(1), 0x06,                         // Keyboard
+        COLLECTION(1), 0x01,                    // Application
+
+        USAGE_PAGE(1), 0x07,                    // Key Codes
+        USAGE_MINIMUM(1), 0xE0,
+        USAGE_MAXIMUM(1), 0xE7,
+        LOGICAL_MINIMUM(1), 0x00,
+        LOGICAL_MAXIMUM(1), 0x01,
+        REPORT_SIZE(1), 0x01,
+        REPORT_COUNT(1), 0x08,
+        INPUT(1), 0x02,                         // Data, Variable, Absolute
+
+        REPORT_COUNT(1), 0x01,
+        REPORT_SIZE(1), 0x08,
+        INPUT(1), 0x01,                         // Constant
+
+        REPORT_COUNT(1), 0x05,
+        REPORT_SIZE(1), 0x01,
+        USAGE_PAGE(1), 0x08,                    // LEDs
+        USAGE_MINIMUM(1), 0x01,
+        USAGE_MAXIMUM(1), 0x05,
+        OUTPUT(1), 0x02,                        // Data, Variable, Absolute
+
+        REPORT_COUNT(1), 0x01,
+        REPORT_SIZE(1), 0x03,
+        OUTPUT(1), 0x01,                        // Constant
+
+
+        REPORT_COUNT(1), 0x06,
+        REPORT_SIZE(1), 0x08,
+        LOGICAL_MINIMUM(1), 0x00,
+        LOGICAL_MAXIMUM(1), 0xFF,
+        USAGE_PAGE(1), 0x07,                    // Key Codes
+        USAGE_MINIMUM(1), 0x00,
+        USAGE_MAXIMUM(1), 0xFF,
+        INPUT(1), 0x00,                         // Data, Array
+        END_COLLECTION(0),
+    };
+    reportLength = sizeof(reportDescriptor);
+    return reportDescriptor;
+}
+
+uint16_t HIDKeyboard::reportDescLength() {
+    reportDesc();
+    return reportLength;
+}
+
+#define TOTAL_DESCRIPTOR_LENGTH ((1 * CONFIGURATION_DESCRIPTOR_LENGTH) \
+                               + (1 * INTERFACE_DESCRIPTOR_LENGTH) \
+                               + (1 * HID_DESCRIPTOR_LENGTH) \
+                               + (1 * ENDPOINT_DESCRIPTOR_LENGTH))
+uint8_t * HIDKeyboard::configurationDesc() {
+    static uint8_t configurationDescriptor[] = {
+        CONFIGURATION_DESCRIPTOR_LENGTH,// bLength
+        CONFIGURATION_DESCRIPTOR,       // bDescriptorType
+        LSB(TOTAL_DESCRIPTOR_LENGTH),   // wTotalLength (LSB)
+        MSB(TOTAL_DESCRIPTOR_LENGTH),   // wTotalLength (MSB)
+        0x01,                           // bNumInterfaces
+        DEFAULT_CONFIGURATION,          // bConfigurationValue
+        0x00,                           // iConfiguration
+        C_RESERVED | C_REMOTE_WAKEUP,   // bmAttributes
+        C_POWER(100),                   // bMaxPowerHello World from Mbed
+
+        INTERFACE_DESCRIPTOR_LENGTH,    // bLength
+        INTERFACE_DESCRIPTOR,           // bDescriptorType
+        0x00,                           // bInterfaceNumber
+        0x00,                           // bAlternateSetting
+        0x01,                           // bNumEndpoints
+        HID_CLASS,                      // bInterfaceClass
+        1,                              // bInterfaceSubClass (boot)
+        1,                              // bInterfaceProtocol (keyboard)
+        0x00,                           // iInterface
+
+        HID_DESCRIPTOR_LENGTH,          // bLength
+        HID_DESCRIPTOR,                 // bDescriptorType
+        LSB(HID_VERSION_1_11),          // bcdHID (LSB)
+        MSB(HID_VERSION_1_11),          // bcdHID (MSB)
+        0x00,                           // bCountryCode
+        0x01,                           // bNumDescriptors
+        REPORT_DESCRIPTOR,              // bDescriptorType
+        (uint8_t)(LSB(reportDescLength())),  // wDescriptorLength (LSB)
+        (uint8_t)(MSB(reportDescLength())),  // wDescriptorLength (MSB)
+
+        ENDPOINT_DESCRIPTOR_LENGTH,     // bLength
+        ENDPOINT_DESCRIPTOR,            // bDescriptorType
+        PHY_TO_DESC(EP1IN),             // bEndpointAddress
+        E_INTERRUPT,                    // bmAttributes
+        LSB(MAX_PACKET_SIZE_EPINT),     // wMaxPacketSize (LSB)
+        MSB(MAX_PACKET_SIZE_EPINT),     // wMaxPacketSize (MSB)
+        1,                           // bInterval (milliseconds)
+    };
+    return configurationDescriptor;
+}
+
+#if 0
+uint8_t * HIDKeyboard::deviceDesc() {
+    static uint8_t deviceDescriptor[] = {
+        DEVICE_DESCRIPTOR_LENGTH,       /* bLength */
+        DEVICE_DESCRIPTOR,              /* bDescriptorType */
+        LSB(USB_VERSION_2_0),           /* bcdUSB (LSB) */
+        MSB(USB_VERSION_2_0),           /* bcdUSB (MSB) */
+        0x00,                           /* bDeviceClass */
+        0x00,                           /* bDeviceSubClass */
+        0x00,                           /* bDeviceprotocol */
+        MAX_PACKET_SIZE_EP0,            /* bMaxPacketSize0 */
+        (uint8_t)(LSB(0xfeed)),                 /* idVendor (LSB) */
+        (uint8_t)(MSB(0xfeed)),                 /* idVendor (MSB) */
+        (uint8_t)(LSB(0x1bed)),                /* idProduct (LSB) */
+        (uint8_t)(MSB(0x1bed)),                /* idProduct (MSB) */
+        (uint8_t)(LSB(0x0002)),           /* bcdDevice (LSB) */
+        (uint8_t)(MSB(0x0002)),           /* bcdDevice (MSB) */
+        0,    /* iManufacturer */
+        0,         /* iProduct */
+        0,          /* iSerialNumber */
+        0x01                            /* bNumConfigurations */
+    };
+    return deviceDescriptor;
+}
+#endif
+
+bool HIDKeyboard::USBCallback_request() {
+    bool success = false;
+    CONTROL_TRANSFER * transfer = getTransferPtr();
+    uint8_t *hidDescriptor;
+
+    // Process additional standard requests
+
+    if ((transfer->setup.bmRequestType.Type == STANDARD_TYPE))
+    {
+        switch (transfer->setup.bRequest)
+        {
+            case GET_DESCRIPTOR:
+                switch (DESCRIPTOR_TYPE(transfer->setup.wValue))
+                {
+                    case REPORT_DESCRIPTOR:
+                        if ((reportDesc() != NULL) \
+                            && (reportDescLength() != 0))
+                        {
+                            transfer->remaining = reportDescLength();
+                            transfer->ptr = reportDesc();
+                            transfer->direction = DEVICE_TO_HOST;
+                            success = true;
+                        }
+                        break;
+                    case HID_DESCRIPTOR:
+                            // Find the HID descriptor, after the configuration descriptor
+                            hidDescriptor = findDescriptor(HID_DESCRIPTOR);
+                            if (hidDescriptor != NULL)
+                            {
+                                transfer->remaining = HID_DESCRIPTOR_LENGTH;
+                                transfer->ptr = hidDescriptor;
+                                transfer->direction = DEVICE_TO_HOST;
+                                success = true;
+                            }
+                            break;
+                     
+                    default:
+                        break;
+                }
+                break;
+            default:
+                break;
+        }
+    }
+
+    // Process class-specific requests
+    if (transfer->setup.bmRequestType.Type == CLASS_TYPE)
+    {
+        switch (transfer->setup.bRequest) {
+            case SET_REPORT:
+                // LED indicator
+                // TODO: check Interface and Report length?
+                // if (transfer->setup.wIndex == INTERFACE_KEYBOAD) { }
+                // if (transfer->setup.wLength == 1)
+
+                transfer->remaining = 1;
+                //transfer->ptr = ?? what ptr should be set when OUT(not used?)
+                transfer->direction = HOST_TO_DEVICE;
+                transfer->notify = true;    /* notify with USBCallback_requestCompleted */
+                success = true;
+            default:
+                break;
+        }
+    }
+
+    return success;
+}
+
+void HIDKeyboard::USBCallback_requestCompleted(uint8_t * buf, uint32_t length)
+{
+    if (length > 0) {
+        CONTROL_TRANSFER *transfer = getTransferPtr();
+        if (transfer->setup.bmRequestType.Type == CLASS_TYPE) {
+            switch (transfer->setup.bRequest) {
+                case SET_REPORT:
+                    led_state = buf[0];
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+}
diff --git a/protocol/mbed/HIDKeyboard.h b/protocol/mbed/HIDKeyboard.h
new file mode 100644
index 000000000..c537e5ece
--- /dev/null
+++ b/protocol/mbed/HIDKeyboard.h
@@ -0,0 +1,31 @@
+#ifndef HIDKEYBOARD_H
+
+#include "stdint.h"
+#include "stdbool.h"
+#include "USBHID.h"
+#include "report.h"
+
+
+class HIDKeyboard : public USBDevice {
+public:
+    HIDKeyboard(uint16_t vendor_id = 0xFEED, uint16_t product_id = 0xabed, uint16_t product_release = 0x0001);
+
+    bool sendReport(report_keyboard_t report);
+    uint8_t leds(void);
+protected:
+    uint16_t reportLength;
+    virtual bool USBCallback_setConfiguration(uint8_t configuration);
+    virtual uint8_t * stringImanufacturerDesc();
+    virtual uint8_t * stringIproductDesc();
+    virtual uint8_t * stringIserialDesc();
+    virtual uint16_t reportDescLength();
+    virtual uint8_t * reportDesc();
+    virtual uint8_t * configurationDesc();
+    //virtual uint8_t * deviceDesc();
+    virtual bool USBCallback_request();
+    virtual void USBCallback_requestCompleted(uint8_t * buf, uint32_t length);
+private:
+    uint8_t led_state;
+};
+
+#endif
diff --git a/protocol/mbed/mbed_driver.cpp b/protocol/mbed/mbed_driver.cpp
new file mode 100644
index 000000000..6c7b16e23
--- /dev/null
+++ b/protocol/mbed/mbed_driver.cpp
@@ -0,0 +1,41 @@
+#include "HIDKeyboard.h"
+#include "host.h"
+#include "host_driver.h"
+#include "mbed_driver.h"
+
+HIDKeyboard keyboard;
+
+
+/* Host driver */
+static uint8_t keyboard_leds(void);
+static void send_keyboard(report_keyboard_t *report);
+static void send_mouse(report_mouse_t *report);
+static void send_system(uint16_t data);
+static void send_consumer(uint16_t data);
+
+host_driver_t mbed_driver = {
+    keyboard_leds,
+    send_keyboard,
+    send_mouse,
+    send_system,
+    send_consumer
+};
+
+
+static uint8_t keyboard_leds(void)
+{
+    return keyboard.leds();
+}
+static void send_keyboard(report_keyboard_t *report)
+{
+    keyboard.sendReport(*report);
+}
+static void send_mouse(report_mouse_t *report)
+{
+}
+static void send_system(uint16_t data)
+{
+}
+static void send_consumer(uint16_t data)
+{
+}
diff --git a/protocol/mbed/mbed_driver.h b/protocol/mbed/mbed_driver.h
new file mode 100644
index 000000000..dd1153b43
--- /dev/null
+++ b/protocol/mbed/mbed_driver.h
@@ -0,0 +1,3 @@
+#include "host_driver.h"
+
+extern host_driver_t mbed_driver;
diff --git a/protocol/ps2.h b/protocol/ps2.h
index 483eea720..acde679cf 100644
--- a/protocol/ps2.h
+++ b/protocol/ps2.h
@@ -39,8 +39,9 @@ POSSIBILITY OF SUCH DAMAGE.
 #define PS2_H
 
 #include <stdbool.h>
-#include <util/delay.h>
-#include <avr/io.h>
+#include "wait.h"
+#include "ps2_io.h"
+#include "print.h"
 
 /*
  * Primitive PS/2 Library for AVR
@@ -92,79 +93,27 @@ uint8_t ps2_host_recv(void);
 void ps2_host_set_led(uint8_t usb_led);
 
 
-/* Check port settings for clock and data line */
-#if !(defined(PS2_CLOCK_PORT) && \
-      defined(PS2_CLOCK_PIN) && \
-      defined(PS2_CLOCK_DDR) && \
-      defined(PS2_CLOCK_BIT))
-#   error "PS/2 clock port setting is required in config.h"
-#endif
-
-#if !(defined(PS2_DATA_PORT) && \
-      defined(PS2_DATA_PIN) && \
-      defined(PS2_DATA_DDR) && \
-      defined(PS2_DATA_BIT))
-#   error "PS/2 data port setting is required in config.h"
-#endif
-
 /*--------------------------------------------------------------------
  * static functions
  *------------------------------------------------------------------*/
-static inline void clock_lo(void)
-{
-    PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
-    PS2_CLOCK_DDR  |=  (1<<PS2_CLOCK_BIT);
-}
-static inline void clock_hi(void)
-{
-    /* input with pull up */
-    PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
-    PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
-}
-static inline bool clock_in(void)
-{
-    PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
-    PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
-    _delay_us(1);
-    return PS2_CLOCK_PIN&(1<<PS2_CLOCK_BIT);
-}
-static inline void data_lo(void)
-{
-    PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT);
-    PS2_DATA_DDR  |=  (1<<PS2_DATA_BIT);
-}
-static inline void data_hi(void)
-{
-    /* input with pull up */
-    PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
-    PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
-}
-static inline bool data_in(void)
-{
-    PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
-    PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
-    _delay_us(1);
-    return PS2_DATA_PIN&(1<<PS2_DATA_BIT);
-}
-
 static inline uint16_t wait_clock_lo(uint16_t us)
 {
-    while (clock_in()  && us) { asm(""); _delay_us(1); us--; }
+    while (clock_in()  && us) { asm(""); wait_us(1); us--; }
     return us;
 }
 static inline uint16_t wait_clock_hi(uint16_t us)
 {
-    while (!clock_in() && us) { asm(""); _delay_us(1); us--; }
+    while (!clock_in() && us) { asm(""); wait_us(1); us--; }
     return us;
 }
 static inline uint16_t wait_data_lo(uint16_t us)
 {
-    while (data_in() && us)  { asm(""); _delay_us(1); us--; }
+    while (data_in() && us)  { asm(""); wait_us(1); us--; }
     return us;
 }
 static inline uint16_t wait_data_hi(uint16_t us)
 {
-    while (!data_in() && us)  { asm(""); _delay_us(1); us--; }
+    while (!data_in() && us)  { asm(""); wait_us(1); us--; }
     return us;
 }
 
diff --git a/protocol/ps2_busywait.c b/protocol/ps2_busywait.c
index 05dd7b27e..a64933219 100644
--- a/protocol/ps2_busywait.c
+++ b/protocol/ps2_busywait.c
@@ -40,8 +40,9 @@ POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include <stdbool.h>
-#include <util/delay.h>
+#include "wait.h"
 #include "ps2.h"
+#include "ps2_io.h"
 #include "debug.h"
 
 
@@ -58,8 +59,11 @@ uint8_t ps2_error = PS2_ERR_NONE;
 
 void ps2_host_init(void)
 {
+    clock_init();
+    data_init();
+
     // POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20)
-    _delay_ms(2500);
+    wait_ms(2500);
 
     inhibit();
 }
@@ -71,7 +75,7 @@ uint8_t ps2_host_send(uint8_t data)
 
     /* terminate a transmission if we have */
     inhibit();
-    _delay_us(100); // 100us [4]p.13, [5]p.50
+    wait_us(100); // 100us [4]p.13, [5]p.50
 
     /* 'Request to Send' and Start bit */
     data_lo();
@@ -80,7 +84,7 @@ uint8_t ps2_host_send(uint8_t data)
 
     /* Data bit */
     for (uint8_t i = 0; i < 8; i++) {
-        _delay_us(15);
+        wait_us(15);
         if (data&(1<<i)) {
             parity = !parity;
             data_hi();
@@ -92,13 +96,13 @@ uint8_t ps2_host_send(uint8_t data)
     }
 
     /* Parity bit */
-    _delay_us(15);
+    wait_us(15);
     if (parity) { data_hi(); } else { data_lo(); }
     WAIT(clock_hi, 50, 4);
     WAIT(clock_lo, 50, 5);
 
     /* Stop bit */
-    _delay_us(15);
+    wait_us(15);
     data_hi();
 
     /* Ack */
diff --git a/protocol/ps2_io.h b/protocol/ps2_io.h
new file mode 100644
index 000000000..a46a358e7
--- /dev/null
+++ b/protocol/ps2_io.h
@@ -0,0 +1,15 @@
+#ifndef PS2_IO_H
+#define PS2_IO_H
+
+
+void clock_init(void);
+void clock_lo(void);
+void clock_hi(void);
+bool clock_in(void);
+
+void data_init(void);
+void data_lo(void);
+void data_hi(void);
+bool data_in(void);
+
+#endif
diff --git a/protocol/ps2_io_avr.c b/protocol/ps2_io_avr.c
new file mode 100644
index 000000000..be13d6696
--- /dev/null
+++ b/protocol/ps2_io_avr.c
@@ -0,0 +1,74 @@
+#include <stdbool.h>
+#include <util/delay.h>
+
+/* Check port settings for clock and data line */
+#if !(defined(PS2_CLOCK_PORT) && \
+      defined(PS2_CLOCK_PIN) && \
+      defined(PS2_CLOCK_DDR) && \
+      defined(PS2_CLOCK_BIT))
+#   error "PS/2 clock port setting is required in config.h"
+#endif
+
+#if !(defined(PS2_DATA_PORT) && \
+      defined(PS2_DATA_PIN) && \
+      defined(PS2_DATA_DDR) && \
+      defined(PS2_DATA_BIT))
+#   error "PS/2 data port setting is required in config.h"
+#endif
+
+
+/*
+ * Clock
+ */
+void clock_init(void)
+{
+}
+
+void clock_lo(void)
+{
+    PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
+    PS2_CLOCK_DDR  |=  (1<<PS2_CLOCK_BIT);
+}
+
+void clock_hi(void)
+{
+    /* input with pull up */
+    PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
+    PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
+}
+
+bool clock_in(void)
+{
+    PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
+    PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
+    _delay_us(1);
+    return PS2_CLOCK_PIN&(1<<PS2_CLOCK_BIT);
+}
+
+/*
+ * Data
+ */
+void data_init(void)
+{
+}
+
+void data_lo(void)
+{
+    PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT);
+    PS2_DATA_DDR  |=  (1<<PS2_DATA_BIT);
+}
+
+void data_hi(void)
+{
+    /* input with pull up */
+    PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
+    PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
+}
+
+bool data_in(void)
+{
+    PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
+    PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
+    _delay_us(1);
+    return PS2_DATA_PIN&(1<<PS2_DATA_BIT);
+}
diff --git a/protocol/ps2_io_mbed.c b/protocol/ps2_io_mbed.c
new file mode 100644
index 000000000..83bdcef7f
--- /dev/null
+++ b/protocol/ps2_io_mbed.c
@@ -0,0 +1,60 @@
+#include <stdbool.h>
+#include "ps2_io.h"
+#include "gpio_api.h"
+
+
+static gpio_t clock;
+static gpio_t data;
+
+/*
+ * Clock
+ */
+void clock_init(void)
+{
+    gpio_init(&clock, P0_9);
+    gpio_mode(&clock, OpenDrain|PullNone);
+}
+
+void clock_lo(void)
+{
+    gpio_dir(&clock, PIN_OUTPUT);
+    gpio_write(&clock, 0);
+}
+void clock_hi(void)
+{
+    gpio_dir(&clock, PIN_OUTPUT);
+    gpio_write(&clock, 1);
+}
+
+bool clock_in(void)
+{
+    gpio_dir(&clock, PIN_INPUT);
+    return gpio_read(&clock);
+}
+
+/*
+ * Data
+ */
+void data_init(void)
+{
+    gpio_init(&data, P0_8);
+    gpio_mode(&data, OpenDrain|PullNone);
+}
+
+void data_lo(void)
+{
+    gpio_dir(&data, PIN_OUTPUT);
+    gpio_write(&data, 0);
+}
+
+void data_hi(void)
+{
+    gpio_dir(&data, PIN_OUTPUT);
+    gpio_write(&data, 1);
+}
+
+bool data_in(void)
+{
+    gpio_dir(&data, PIN_INPUT);
+    return gpio_read(&data);
+}
diff --git a/protocol/serial_uart.c b/protocol/serial_uart.c
index 6c0af8817..35df27fd6 100644
--- a/protocol/serial_uart.c
+++ b/protocol/serial_uart.c
@@ -41,13 +41,29 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "serial.h"
 
 
+#if defined(SERIAL_UART_RTS_LO) && defined(SERIAL_UART_RTS_HI)
+    // Buffer state
+    //   Empty:           RBUF_SPACE == RBUF_SIZE(head==tail)
+    //   Last 1 space:    RBUF_SPACE == 2
+    //   Full:            RBUF_SPACE == 1(last cell of rbuf be never used.)
+    #define RBUF_SPACE()   (rbuf_head < rbuf_tail ?  (rbuf_tail - rbuf_head) : (RBUF_SIZE - rbuf_head + rbuf_tail))
+    // allow to send
+    #define rbuf_check_rts_lo() do { if (RBUF_SPACE() > 2) SERIAL_UART_RTS_LO(); } while (0)
+    // prohibit to send
+    #define rbuf_check_rts_hi() do { if (RBUF_SPACE() <= 2) SERIAL_UART_RTS_HI(); } while (0)
+#else
+    #define rbuf_check_rts_lo()
+    #define rbuf_check_rts_hi()
+#endif
+
+
 void serial_init(void)
 {
     SERIAL_UART_INIT();
 }
 
 // RX ring buffer
-#define RBUF_SIZE   8
+#define RBUF_SIZE   256
 static uint8_t rbuf[RBUF_SIZE];
 static uint8_t rbuf_head = 0;
 static uint8_t rbuf_tail = 0;
@@ -61,6 +77,7 @@ uint8_t serial_recv(void)
 
     data = rbuf[rbuf_tail];
     rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+    rbuf_check_rts_lo();
     return data;
 }
 
@@ -73,6 +90,7 @@ int16_t serial_recv2(void)
 
     data = rbuf[rbuf_tail];
     rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+    rbuf_check_rts_lo();
     return data;
 }
 
@@ -90,4 +108,5 @@ ISR(SERIAL_UART_RXD_VECT)
         rbuf[rbuf_head] = SERIAL_UART_DATA;
         rbuf_head = next;
     }
+    rbuf_check_rts_hi();
 }