diff options
Diffstat (limited to 'tmk_core/protocol/ps2_busywait.c')
| -rw-r--r-- | tmk_core/protocol/ps2_busywait.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/tmk_core/protocol/ps2_busywait.c b/tmk_core/protocol/ps2_busywait.c deleted file mode 100644 index 983194eea8..0000000000 --- a/tmk_core/protocol/ps2_busywait.c +++ /dev/null @@ -1,187 +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 busywait version - */ - -#include <stdbool.h> -#include "wait.h" -#include "ps2.h" -#include "ps2_io.h" -#include "debug.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; - -void ps2_host_init(void) { - clock_init(); - data_init(); - - // POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20) - wait_ms(2500); - - inhibit(); -} - -uint8_t ps2_host_send(uint8_t data) { - bool parity = true; - ps2_error = PS2_ERR_NONE; - - /* terminate a transmission if we have */ - inhibit(); - wait_us(100); // 100us [4]p.13, [5]p.50 - - /* 'Request to Send' and Start bit */ - data_lo(); - clock_hi(); - WAIT(clock_lo, 10000, 10); // 10ms [5]p.50 - - /* Data bit */ - for (uint8_t i = 0; i < 8; i++) { - wait_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 */ - wait_us(15); - if (parity) { - data_hi(); - } else { - data_lo(); - } - WAIT(clock_hi, 50, 4); - WAIT(clock_lo, 50, 5); - - /* Stop bit */ - wait_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); - - inhibit(); - return ps2_host_recv_response(); -ERROR: - inhibit(); - return 0; -} - -/* receive data when host want else inhibit communication */ -uint8_t ps2_host_recv_response(void) { - // Command may take 25ms/20ms at most([5]p.46, [3]p.21) - // 250 * 100us(wait for start bit in ps2_host_recv) - uint8_t data = 0; - uint8_t try - = 250; - do { - data = ps2_host_recv(); - } while (try --&&ps2_error); - return data; -} - -/* called after start bit comes */ -uint8_t ps2_host_recv(void) { - uint8_t data = 0; - bool parity = true; - ps2_error = PS2_ERR_NONE; - - /* release lines(idle state) */ - idle(); - - /* start bit [1] */ - WAIT(clock_lo, 100, 1); // TODO: this is enough? - WAIT(data_lo, 1, 2); - WAIT(clock_hi, 50, 3); - - /* data [2-9] */ - for (uint8_t i = 0; i < 8; i++) { - WAIT(clock_lo, 50, 4); - if (data_in()) { - parity = !parity; - data |= (1 << i); - } - WAIT(clock_hi, 50, 5); - } - - /* parity [10] */ - WAIT(clock_lo, 50, 6); - if (data_in() != parity) { - ps2_error = PS2_ERR_PARITY; - goto ERROR; - } - WAIT(clock_hi, 50, 7); - - /* stop bit [11] */ - WAIT(clock_lo, 50, 8); - WAIT(data_hi, 1, 9); - WAIT(clock_hi, 50, 10); - - inhibit(); - return data; -ERROR: - if (ps2_error > PS2_ERR_STARTBIT3) { - xprintf("x%02X\n", ps2_error); - } - inhibit(); - return 0; -} - -/* send LED state to keyboard */ -void ps2_host_set_led(uint8_t led) { - ps2_host_send(0xED); - ps2_host_send(led); -} |