From f4125707399d11a7d80587659c464b9bcddb8c56 Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Thu, 7 Jun 2012 02:25:15 +0900
Subject: Moved files to common, protocol and doc  directory

---
 ps2_usart.c | 324 ------------------------------------------------------------
 1 file changed, 324 deletions(-)
 delete mode 100644 ps2_usart.c

(limited to 'ps2_usart.c')

diff --git a/ps2_usart.c b/ps2_usart.c
deleted file mode 100644
index 7d591c6506..0000000000
--- a/ps2_usart.c
+++ /dev/null
@@ -1,324 +0,0 @@
-/*
-Copyright 2010,2011 Jun WAKO <wakojun@gmail.com>
-
-This software is licensed with a Modified BSD License.
-All of this is supposed to be Free Software, Open Source, DFSG-free,
-GPL-compatible, and OK to use in both free and proprietary applications.
-Additions and corrections to this file are welcome.
-
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-* Redistributions of source code must retain the above copyright
-  notice, this list of conditions and the following disclaimer.
-
-* Redistributions in binary form must reproduce the above copyright
-  notice, this list of conditions and the following disclaimer in
-  the documentation and/or other materials provided with the
-  distribution.
-
-* Neither the name of the copyright holders nor the names of
-  contributors may be used to endorse or promote products derived
-  from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
-LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-*/
-
-/*
-Primitive PS/2 Library for AVR
-==============================
-Host side is only supported now.
-Synchronous USART is used to receive data by hardware process
-rather than interrupt. During V-USB interrupt runs, CLOCK interrupt
-cannot interpose. In the result it is prone to lost CLOCK edge.
-
-
-I/O control
------------
-High state is asserted by internal pull-up.
-If you have a signaling problem, you may need to have
-external pull-up resisters on CLOCK and DATA line.
-
-
-PS/2 References
----------------
-http://www.computer-engineering.org/ps2protocol/
-http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
-*/
-#include <stdbool.h>
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <util/delay.h>
-#include "ps2.h"
-#include "debug.h"
-
-
-#if 0
-#define DEBUGP_INIT() do { DDRC = 0xFF; } while (0)
-#define DEBUGP(x) do { PORTC = x; } while (0)
-#else
-#define DEBUGP_INIT()
-#define DEBUGP(x)
-#endif
-
-#define WAIT(stat, us, err) do { \
-    if (!wait_##stat(us)) { \
-        ps2_error = err; \
-        goto ERROR; \
-    } \
-} while (0)
-
-
-uint8_t ps2_error = PS2_ERR_NONE;
-
-
-static inline void clock_lo(void);
-static inline void clock_hi(void);
-static inline bool clock_in(void);
-static inline void data_lo(void);
-static inline void data_hi(void);
-static inline bool data_in(void);
-static inline uint16_t wait_clock_lo(uint16_t us);
-static inline uint16_t wait_clock_hi(uint16_t us);
-static inline uint16_t wait_data_lo(uint16_t us);
-static inline uint16_t wait_data_hi(uint16_t us);
-static inline void idle(void);
-static inline void inhibit(void);
-static inline uint8_t pbuf_dequeue(void);
-static inline void pbuf_enqueue(uint8_t data);
-
-
-void ps2_host_init(void)
-{
-    DEBUGP_INIT();
-    DEBUGP(0x1);
-    idle();
-    PS2_USART_INIT();
-    PS2_USART_RX_INT_ON();
-}
-
-uint8_t ps2_host_send(uint8_t data)
-{
-    uint8_t res = 0;
-    bool parity = true;
-    ps2_error = PS2_ERR_NONE;
-
-    DEBUGP(0x6);
-    PS2_USART_OFF();
-
-    /* terminate a transmission if we have */
-    inhibit();
-    _delay_us(100);
-
-    /* start bit [1] */
-    data_lo();
-    clock_hi();
-    WAIT(clock_lo, 15000, 1);
-    /* data [2-9] */
-    for (uint8_t i = 0; i < 8; i++) {
-        _delay_us(15);
-        if (data&(1<<i)) {
-            parity = !parity;
-            data_hi();
-        } else {
-            data_lo();
-        }
-        WAIT(clock_hi, 50, 2);
-        WAIT(clock_lo, 50, 3);
-    }
-    /* parity [10] */
-    _delay_us(15);
-    if (parity) { data_hi(); } else { data_lo(); }
-    WAIT(clock_hi, 50, 4);
-    WAIT(clock_lo, 50, 5);
-    /* stop bit [11] */
-    _delay_us(15);
-    data_hi();
-    /* ack [12] */
-    WAIT(data_lo, 50, 6);
-    WAIT(clock_lo, 50, 7);
-
-    /* wait for idle state */
-    WAIT(clock_hi, 50, 8);
-    WAIT(data_hi, 50, 9);
-
-    res = ps2_host_recv_response();
-ERROR:
-    idle();
-    PS2_USART_INIT();
-    PS2_USART_RX_INT_ON();
-    return res;
-}
-
-// Do polling data from keyboard to get response to last command.
-uint8_t ps2_host_recv_response(void)
-{
-    uint8_t data = 0;
-    PS2_USART_INIT();
-    PS2_USART_RX_POLL_ON();
-    while (!PS2_USART_RX_READY)
-        ;
-    data = PS2_USART_RX_DATA;
-    PS2_USART_OFF();
-    DEBUGP(0x9);
-    return data;
-}
-
-uint8_t ps2_host_recv(void)
-{
-    return pbuf_dequeue();
-}
-
-ISR(PS2_USART_RX_VECT)
-{
-    DEBUGP(0x7);
-    uint8_t error = PS2_USART_ERROR;
-    uint8_t data = PS2_USART_RX_DATA;
-    if (error) {
-        DEBUGP(error>>2);
-    } else {
-        pbuf_enqueue(data);
-    }
-    DEBUGP(0x8);
-}
-
-/* send LED state to keyboard */
-void ps2_host_set_led(uint8_t led)
-{
-    // send 0xED then keyboard keeps waiting for next LED data
-    // and keyboard does not send any scan codes during waiting.
-    // If fail to send LED data keyboard looks like being freezed.
-    uint8_t retry = 3;
-    while (retry-- && ps2_host_send(PS2_SET_LED) != PS2_ACK)
-        ;
-    retry = 3;
-    while (retry-- && ps2_host_send(led) != PS2_ACK)
-        ;
-}
-
-
-/*--------------------------------------------------------------------
- * static functions
- *------------------------------------------------------------------*/
-static inline void clock_lo()
-{
-    PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
-    PS2_CLOCK_DDR  |=  (1<<PS2_CLOCK_BIT);
-}
-static inline void clock_hi()
-{
-    /* input with pull up */
-    PS2_CLOCK_DDR  &= ~(1<<PS2_CLOCK_BIT);
-    PS2_CLOCK_PORT |=  (1<<PS2_CLOCK_BIT);
-}
-static inline bool clock_in()
-{
-    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()
-{
-    PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT);
-    PS2_DATA_DDR  |=  (1<<PS2_DATA_BIT);
-}
-static inline void data_hi()
-{
-    /* input with pull up */
-    PS2_DATA_DDR  &= ~(1<<PS2_DATA_BIT);
-    PS2_DATA_PORT |=  (1<<PS2_DATA_BIT);
-}
-static inline bool data_in()
-{
-    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--; }
-    return us;
-}
-static inline uint16_t wait_clock_hi(uint16_t us)
-{
-    while (!clock_in() && us) { asm(""); _delay_us(1); us--; }
-    return us;
-}
-static inline uint16_t wait_data_lo(uint16_t us)
-{
-    while (data_in() && us)  { asm(""); _delay_us(1); us--; }
-    return us;
-}
-static inline uint16_t wait_data_hi(uint16_t us)
-{
-    while (!data_in() && us)  { asm(""); _delay_us(1); us--; }
-    return us;
-}
-
-/* idle state that device can send */
-static inline void idle(void)
-{
-    clock_hi();
-    data_hi();
-}
-
-/* inhibit device to send */
-static inline void inhibit(void)
-{
-    clock_lo();
-    data_hi();
-}
-
-
-/*--------------------------------------------------------------------
- * Ring buffer to store scan codes from keyboard
- *------------------------------------------------------------------*/
-#define PBUF_SIZE 8
-static uint8_t pbuf[PBUF_SIZE];
-static uint8_t pbuf_head = 0;
-static uint8_t pbuf_tail = 0;
-static inline void pbuf_enqueue(uint8_t data)
-{
-    if (!data)
-        return;
-
-    uint8_t sreg = SREG;
-    cli();
-    uint8_t next = (pbuf_head + 1) % PBUF_SIZE;
-    if (next != pbuf_tail) {
-        pbuf[pbuf_head] = data;
-        pbuf_head = next;
-    } else {
-        debug("pbuf: full\n");
-    }
-    SREG = sreg;
-}
-
-static inline uint8_t pbuf_dequeue(void)
-{
-    uint8_t val = 0;
-
-    uint8_t sreg = SREG;
-    cli();
-    if (pbuf_head != pbuf_tail) {
-        val = pbuf[pbuf_tail];
-        pbuf_tail = (pbuf_tail + 1) % PBUF_SIZE;
-    }
-    SREG = sreg;
-
-    return val;
-}
-- 
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