forked from mirrors/qmk_userspace
Add ps2_busywait.c and recfactor PS/2 protocol
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5 changed files with 363 additions and 53 deletions
142
protocol/ps2.h
142
protocol/ps2.h
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@ -1,5 +1,5 @@
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/*
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Copyright 2010,2011 Jun WAKO <wakojun@gmail.com>
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Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
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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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@ -37,12 +37,60 @@ POSSIBILITY OF SUCH DAMAGE.
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#ifndef PS2_H
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#define PS2_H
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#include <stdbool.h>
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#include <util/delay.h>
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#include <avr/io.h>
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/*
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* Primitive PS/2 Library for AVR
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*
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* PS/2 Resources
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* --------------
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* [1] The PS/2 Mouse/Keyboard Protocol
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* http://www.computer-engineering.org/ps2protocol/
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* Concise and thorough primer of PS/2 protocol.
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*
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* [2] Keyboard and Auxiliary Device Controller
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* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
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* Signal Timing and Format
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*
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* [3] Keyboards(101- and 102-key)
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* http://www.mcamafia.de/pdf/ibm_hitrc11.pdf
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* Keyboard Layout, Scan Code Set, POR, and Commands.
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*
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* [4] PS/2 Reference Manuals
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* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
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* Collection of IBM Personal System/2 documents.
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*
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* [5] TrackPoint Engineering Specifications for version 3E
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* https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
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*/
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#define PS2_ACK 0xFA
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#define PS2_RESEND 0xFE
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#define PS2_SET_LED 0xED
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#define PS2_ERR_NONE 0
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#define PS2_ERR_STARTBIT1 1
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#define PS2_ERR_STARTBIT2 2
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#define PS2_ERR_STARTBIT3 3
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#define PS2_ERR_PARITY 0x10
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#define PS2_LED_SCROLL_LOCK 0
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#define PS2_LED_NUM_LOCK 1
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#define PS2_LED_CAPS_LOCK 2
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/* port settings for clock and data line */
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extern uint8_t ps2_error;
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void ps2_host_init(void);
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uint8_t ps2_host_send(uint8_t data);
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uint8_t ps2_host_recv_response(void);
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uint8_t ps2_host_recv(void);
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void ps2_host_set_led(uint8_t usb_led);
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/* Check port settings for clock and data line */
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#if !(defined(PS2_CLOCK_PORT) && \
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defined(PS2_CLOCK_PIN) && \
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defined(PS2_CLOCK_DDR) && \
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@ -57,27 +105,79 @@ POSSIBILITY OF SUCH DAMAGE.
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# error "PS/2 data port setting is required in config.h"
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#endif
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#define PS2_ACK 0xFA
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#define PS2_RESEND 0xFE
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#define PS2_SET_LED 0xED
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/*--------------------------------------------------------------------
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* static functions
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*------------------------------------------------------------------*/
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static inline void clock_lo(void)
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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(void)
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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(void)
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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(void)
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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(void)
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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(void)
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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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#define PS2_ERR_NONE 0
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#define PS2_ERR_PARITY 0x10
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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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#define PS2_LED_SCROLL_LOCK 0
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#define PS2_LED_NUM_LOCK 1
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#define PS2_LED_CAPS_LOCK 2
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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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extern uint8_t ps2_error;
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/* host role */
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void ps2_host_init(void);
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uint8_t ps2_host_send(uint8_t data);
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uint8_t ps2_host_recv_response(void);
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uint8_t ps2_host_recv(void);
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void ps2_host_set_led(uint8_t usb_led);
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/* device role */
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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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#endif
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