diff options
Diffstat (limited to 'protocol/ps2_usart.c')
| -rw-r--r-- | protocol/ps2_usart.c | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/protocol/ps2_usart.c b/protocol/ps2_usart.c deleted file mode 100644 index 6936ca7b8..000000000 --- a/protocol/ps2_usart.c +++ /dev/null @@ -1,223 +0,0 @@ -/* -Copyright 2010,2011,2012,2013 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. -*/ - -/* - * PS/2 protocol USART version - */ - -#include <stdbool.h> -#include <avr/interrupt.h> -#include <util/delay.h> -#include "ps2.h" -#include "ps2_io.h" -#include "print.h" - - -#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 uint8_t pbuf_dequeue(void); -static inline void pbuf_enqueue(uint8_t data); -static inline bool pbuf_has_data(void); -static inline void pbuf_clear(void); - - -void ps2_host_init(void) -{ - idle(); // without this many USART errors occur when cable is disconnected - PS2_USART_INIT(); - PS2_USART_RX_INT_ON(); - // POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20) - //_delay_ms(2500); -} - -uint8_t ps2_host_send(uint8_t data) -{ - bool parity = true; - ps2_error = PS2_ERR_NONE; - - PS2_USART_OFF(); - - /* terminate a transmission if we have */ - inhibit(); - _delay_us(100); // [4]p.13 - - /* 'Request to Send' and Start bit */ - data_lo(); - clock_hi(); - WAIT(clock_lo, 10000, 10); // 10ms [5]p.50 - - /* Data bit[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 bit */ - _delay_us(15); - if (parity) { data_hi(); } else { data_lo(); } - WAIT(clock_hi, 50, 4); - WAIT(clock_lo, 50, 5); - - /* Stop bit */ - _delay_us(15); - data_hi(); - - /* Ack */ - WAIT(data_lo, 50, 6); - WAIT(clock_lo, 50, 7); - - /* wait for idle state */ - WAIT(clock_hi, 50, 8); - WAIT(data_hi, 50, 9); - - idle(); - PS2_USART_INIT(); - PS2_USART_RX_INT_ON(); - return ps2_host_recv_response(); -ERROR: - idle(); - PS2_USART_INIT(); - PS2_USART_RX_INT_ON(); - return 0; -} - -uint8_t ps2_host_recv_response(void) -{ - // Command may take 25ms/20ms at most([5]p.46, [3]p.21) - uint8_t retry = 25; - while (retry-- && !pbuf_has_data()) { - _delay_ms(1); - } - return pbuf_dequeue(); -} - -uint8_t ps2_host_recv(void) -{ - if (pbuf_has_data()) { - ps2_error = PS2_ERR_NONE; - return pbuf_dequeue(); - } else { - ps2_error = PS2_ERR_NODATA; - return 0; - } -} - -ISR(PS2_USART_RX_VECT) -{ - // TODO: request RESEND when error occurs? - uint8_t error = PS2_USART_ERROR; // USART error should be read before data - uint8_t data = PS2_USART_RX_DATA; - if (!error) { - pbuf_enqueue(data); - } else { - xprintf("PS2 USART error: %02X data: %02X\n", error, data); - } -} - -/* send LED state to keyboard */ -void ps2_host_set_led(uint8_t led) -{ - ps2_host_send(0xED); - ps2_host_send(led); -} - - -/*-------------------------------------------------------------------- - * Ring buffer to store scan codes from keyboard - *------------------------------------------------------------------*/ -#define PBUF_SIZE 32 -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) -{ - 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 { - print("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; -} -static inline bool pbuf_has_data(void) -{ - uint8_t sreg = SREG; - cli(); - bool has_data = (pbuf_head != pbuf_tail); - SREG = sreg; - return has_data; -} -static inline void pbuf_clear(void) -{ - uint8_t sreg = SREG; - cli(); - pbuf_head = pbuf_tail = 0; - SREG = sreg; -} |