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+/*
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+Copyright (c) 2010,2011 Jun WAKO <wakojun@gmail.com>
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+
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+This software is licensed with a Modified BSD License.
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+All of this is supposed to be Free Software, Open Source, DFSG-free,
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+GPL-compatible, and OK to use in both free and proprietary applications.
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+Additions and corrections to this file are welcome.
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+
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+
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+Redistribution and use in source and binary forms, with or without
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+modification, are permitted provided that the following conditions are met:
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+
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+* Redistributions of source code must retain the above copyright
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+ notice, this list of conditions and the following disclaimer.
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+
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+* Redistributions in binary form must reproduce the above copyright
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+ notice, this list of conditions and the following disclaimer in
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+ the documentation and/or other materials provided with the
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+ distribution.
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+
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+* Neither the name of the copyright holders nor the names of
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+ contributors may be used to endorse or promote products derived
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+ from this software without specific prior written permission.
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+
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+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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+POSSIBILITY OF SUCH DAMAGE.
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+*/
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+/*
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+Primitive PS/2 Library for AVR
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+==============================
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+Host side is only supported now.
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+Synchronous USART is used to receive data by hardware process
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+rather than interrupt. During V-USB interrupt runs, CLOCK interrupt
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+cannot interpose. In the result it is prone to lost CLOCK edge.
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+
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+
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+I/O control
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+-----------
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+High state is asserted by internal pull-up.
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+If you have a signaling problem, you may need to have
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+external pull-up resisters on CLOCK and DATA line.
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+
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+
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+PS/2 References
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+---------------
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+http://www.computer-engineering.org/ps2protocol/
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+http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
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+*/
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+#include <stdbool.h>
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+#include <avr/io.h>
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+#include <avr/interrupt.h>
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+#include <util/delay.h>
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+#include "ps2.h"
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+#include "debug.h"
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+
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+
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+#if 0
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+#define DEBUGP_INIT() do { DDRC = 0xFF; } while (0)
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+#define DEBUGP(x) do { PORTC = x; } while (0)
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+#else
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+#define DEBUGP_INIT()
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+#define DEBUGP(x)
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+#endif
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+
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+#define WAIT(stat, us, err) do { \
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+ if (!wait_##stat(us)) { \
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+ ps2_error = err; \
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+ goto ERROR; \
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+ } \
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+} while (0)
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+
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+
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+uint8_t ps2_error = PS2_ERR_NONE;
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+
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+
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+static inline void clock_lo(void);
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+static inline void clock_hi(void);
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+static inline bool clock_in(void);
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+static inline void data_lo(void);
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+static inline void data_hi(void);
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+static inline bool data_in(void);
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+static inline uint16_t wait_clock_lo(uint16_t us);
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+static inline uint16_t wait_clock_hi(uint16_t us);
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+static inline uint16_t wait_data_lo(uint16_t us);
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+static inline uint16_t wait_data_hi(uint16_t us);
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+static inline void idle(void);
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+static inline void inhibit(void);
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+#if defined PS2_USE_INT || defined PS2_USE_USART
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+static inline uint8_t pbuf_dequeue(void);
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+static inline void pbuf_enqueue(uint8_t data);
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+#endif
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+
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+
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+void ps2_host_init(void)
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+{
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+ DEBUGP_INIT();
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+ DEBUGP(0x1);
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+ idle();
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+ PS2_USART_INIT();
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+ PS2_USART_RX_INT_ON();
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+}
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+
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+uint8_t ps2_host_send(uint8_t data)
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+{
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+ uint8_t res = 0;
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+ bool parity = true;
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+ ps2_error = PS2_ERR_NONE;
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+
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+ DEBUGP(0x6);
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+ PS2_USART_OFF();
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+
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+ /* terminate a transmission if we have */
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+ inhibit();
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+ _delay_us(100);
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+
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+ /* start bit [1] */
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+ data_lo();
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+ clock_hi();
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+ WAIT(clock_lo, 15000, 1);
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+ /* data [2-9] */
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+ for (uint8_t i = 0; i < 8; i++) {
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+ _delay_us(15);
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+ if (data&(1<<i)) {
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+ parity = !parity;
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+ data_hi();
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+ } else {
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+ data_lo();
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+ }
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+ WAIT(clock_hi, 50, 2);
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+ WAIT(clock_lo, 50, 3);
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+ }
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+ /* parity [10] */
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+ _delay_us(15);
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+ if (parity) { data_hi(); } else { data_lo(); }
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+ WAIT(clock_hi, 50, 4);
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+ WAIT(clock_lo, 50, 5);
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+ /* stop bit [11] */
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+ _delay_us(15);
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+ data_hi();
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+ /* ack [12] */
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+ WAIT(data_lo, 50, 6);
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+ WAIT(clock_lo, 50, 7);
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+
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+ /* wait for idle state */
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+ WAIT(clock_hi, 50, 8);
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+ WAIT(data_hi, 50, 9);
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+
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+ res = ps2_host_recv_response();
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+ERROR:
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+ idle();
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+ PS2_USART_INIT();
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+ PS2_USART_RX_INT_ON();
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+ return res;
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+}
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+
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+// Do polling data from keyboard to get response to last command.
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+uint8_t ps2_host_recv_response(void)
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+{
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+ uint8_t data = 0;
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+ PS2_USART_INIT();
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+ PS2_USART_RX_POLL_ON();
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+ while (!PS2_USART_RX_READY)
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+ ;
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+ data = PS2_USART_RX_DATA;
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+ PS2_USART_OFF();
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+ DEBUGP(0x9);
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+ return data;
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+}
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+
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+uint8_t ps2_host_recv(void)
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+{
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+ return pbuf_dequeue();
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+}
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+
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+ISR(PS2_USART_RX_VECT)
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+{
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+ DEBUGP(0x7);
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+ uint8_t error = PS2_USART_ERROR;
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+ uint8_t data = PS2_USART_RX_DATA;
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+ if (error) {
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+ DEBUGP(error>>2);
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+ } else {
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+ pbuf_enqueue(data);
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+ }
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+ DEBUGP(0x8);
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+}
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+
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+/* send LED state to keyboard */
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+void ps2_host_set_led(uint8_t led)
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+{
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+ // send 0xED then keyboard keeps waiting for next LED data
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+ // and keyboard does not send any scan codes during waiting.
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+ // If fail to send LED data keyboard looks like being freezed.
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+ uint8_t retry = 3;
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+ while (retry-- && ps2_host_send(PS2_SET_LED) != PS2_ACK)
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+ ;
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+ retry = 3;
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+ while (retry-- && ps2_host_send(led) != PS2_ACK)
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+ ;
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+}
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+
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+
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+/*--------------------------------------------------------------------
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+ * static functions
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+ *------------------------------------------------------------------*/
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+static inline void clock_lo()
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+{
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+ PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT);
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+ PS2_CLOCK_DDR |= (1<<PS2_CLOCK_BIT);
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+}
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+static inline void clock_hi()
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+{
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+ /* input with pull up */
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+ PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT);
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+ PS2_CLOCK_PORT |= (1<<PS2_CLOCK_BIT);
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+}
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+static inline bool clock_in()
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+{
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+ PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT);
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+ PS2_CLOCK_PORT |= (1<<PS2_CLOCK_BIT);
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+ _delay_us(1);
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+ return PS2_CLOCK_PIN&(1<<PS2_CLOCK_BIT);
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+}
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+static inline void data_lo()
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+{
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+ PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT);
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+ PS2_DATA_DDR |= (1<<PS2_DATA_BIT);
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+}
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+static inline void data_hi()
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+{
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+ /* input with pull up */
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+ PS2_DATA_DDR &= ~(1<<PS2_DATA_BIT);
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+ PS2_DATA_PORT |= (1<<PS2_DATA_BIT);
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+}
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+static inline bool data_in()
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+{
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+ PS2_DATA_DDR &= ~(1<<PS2_DATA_BIT);
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+ PS2_DATA_PORT |= (1<<PS2_DATA_BIT);
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+ _delay_us(1);
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+ return PS2_DATA_PIN&(1<<PS2_DATA_BIT);
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+}
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+
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+static inline uint16_t wait_clock_lo(uint16_t us)
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+{
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+ while (clock_in() && us) { asm(""); _delay_us(1); us--; }
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+ return us;
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+}
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+static inline uint16_t wait_clock_hi(uint16_t us)
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+{
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+ while (!clock_in() && us) { asm(""); _delay_us(1); us--; }
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+ return us;
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+}
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+static inline uint16_t wait_data_lo(uint16_t us)
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+{
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+ while (data_in() && us) { asm(""); _delay_us(1); us--; }
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+ return us;
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+}
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+static inline uint16_t wait_data_hi(uint16_t us)
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+{
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+ while (!data_in() && us) { asm(""); _delay_us(1); us--; }
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+ return us;
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+}
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+
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+/* idle state that device can send */
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+static inline void idle(void)
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+{
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+ clock_hi();
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+ data_hi();
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+}
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+
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+/* inhibit device to send */
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+static inline void inhibit(void)
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+{
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+ clock_lo();
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+ data_hi();
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+}
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+
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+
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+/*--------------------------------------------------------------------
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+ * Ring buffer to store scan codes from keyboard
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+ *------------------------------------------------------------------*/
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+#define PBUF_SIZE 8
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+static uint8_t pbuf[PBUF_SIZE];
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+static uint8_t pbuf_head = 0;
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+static uint8_t pbuf_tail = 0;
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+static inline void pbuf_enqueue(uint8_t data)
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+{
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+ if (!data)
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+ return;
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+
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+ uint8_t sreg = SREG;
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+ cli();
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+ uint8_t next = (pbuf_head + 1) % PBUF_SIZE;
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+ if (next != pbuf_tail) {
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+ pbuf[pbuf_head] = data;
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+ pbuf_head = next;
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+ } else {
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+ debug("pbuf: full\n");
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+ }
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+ SREG = sreg;
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+}
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+
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+static inline uint8_t pbuf_dequeue(void)
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+{
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+ uint8_t val = 0;
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+
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+ uint8_t sreg = SREG;
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+ cli();
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+ if (pbuf_head != pbuf_tail) {
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+ val = pbuf[pbuf_tail];
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+ pbuf_tail = (pbuf_tail + 1) % PBUF_SIZE;
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+ }
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+ SREG = sreg;
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+
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+ return val;
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+}
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tmk