diff options
Diffstat (limited to 'protocol')
| -rw-r--r-- | protocol/lufa/lufa.c | 4 | ||||
| -rw-r--r-- | protocol/pjrc/usb.c | 3 | ||||
| -rw-r--r-- | protocol/ps2.h | 146 | ||||
| -rw-r--r-- | protocol/ps2_busywait.c | 185 | ||||
| -rw-r--r-- | protocol/ps2_interrupt.c (renamed from protocol/ps2.c) | 334 | ||||
| -rw-r--r-- | protocol/ps2_usart.c | 174 |
6 files changed, 431 insertions, 415 deletions
diff --git a/protocol/lufa/lufa.c b/protocol/lufa/lufa.c index 04e8e78f38..eca51c8784 100644 --- a/protocol/lufa/lufa.c +++ b/protocol/lufa/lufa.c @@ -148,7 +148,6 @@ static void Console_Task(void) */ void EVENT_USB_Device_Connect(void) { - led_set(0x1f); // all on } void EVENT_USB_Device_Disconnect(void) @@ -172,8 +171,9 @@ void EVENT_USB_Device_WakeUp() #ifdef SLEEP_LED_ENABLE sleep_led_disable(); -#endif + // NOTE: converters may not accept this led_set(host_keyboard_leds()); +#endif } void EVENT_USB_Device_StartOfFrame(void) diff --git a/protocol/pjrc/usb.c b/protocol/pjrc/usb.c index 84c99972f2..393b36f78e 100644 --- a/protocol/pjrc/usb.c +++ b/protocol/pjrc/usb.c @@ -662,8 +662,9 @@ ISR(USB_GEN_vect) suspend_wakeup_init(); #ifdef SLEEP_LED_ENABLE sleep_led_disable(); -#endif + // NOTE: converters may not accept this led_set(host_keyboard_leds()); +#endif UDIEN |= (1<<SUSPE); UDIEN &= ~(1<<WAKEUPE); diff --git a/protocol/ps2.h b/protocol/ps2.h index 834165356c..483eea7209 100644 --- a/protocol/ps2.h +++ b/protocol/ps2.h @@ -1,5 +1,5 @@ /* -Copyright 2010,2011 Jun WAKO <wakojun@gmail.com> +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, @@ -37,32 +37,46 @@ POSSIBILITY OF SUCH DAMAGE. #ifndef PS2_H #define PS2_H + +#include <stdbool.h> +#include <util/delay.h> +#include <avr/io.h> + /* * Primitive PS/2 Library for AVR + * + * PS/2 Resources + * -------------- + * [1] The PS/2 Mouse/Keyboard Protocol + * http://www.computer-engineering.org/ps2protocol/ + * Concise and thorough primer of PS/2 protocol. + * + * [2] Keyboard and Auxiliary Device Controller + * http://www.mcamafia.de/pdf/ibm_hitrc07.pdf + * Signal Timing and Format + * + * [3] Keyboards(101- and 102-key) + * http://www.mcamafia.de/pdf/ibm_hitrc11.pdf + * Keyboard Layout, Scan Code Set, POR, and Commands. + * + * [4] PS/2 Reference Manuals + * http://www.mcamafia.de/pdf/ibm_hitrc07.pdf + * Collection of IBM Personal System/2 documents. + * + * [5] TrackPoint Engineering Specifications for version 3E + * https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html */ - - -/* port settings for clock and data line */ -#if !(defined(PS2_CLOCK_PORT) && \ - defined(PS2_CLOCK_PIN) && \ - defined(PS2_CLOCK_DDR) && \ - defined(PS2_CLOCK_BIT)) -# error "PS/2 clock port setting is required in config.h" -#endif - -#if !(defined(PS2_DATA_PORT) && \ - defined(PS2_DATA_PIN) && \ - defined(PS2_DATA_DDR) && \ - defined(PS2_DATA_BIT)) -# error "PS/2 data port setting is required in config.h" -#endif - #define PS2_ACK 0xFA #define PS2_RESEND 0xFE #define PS2_SET_LED 0xED -#define PS2_ERR_NONE 0 -#define PS2_ERR_PARITY 0x10 +// TODO: error numbers +#define PS2_ERR_NONE 0 +#define PS2_ERR_STARTBIT1 1 +#define PS2_ERR_STARTBIT2 2 +#define PS2_ERR_STARTBIT3 3 +#define PS2_ERR_PARITY 0x10 +#define PS2_ERR_NODATA 0x20 #define PS2_LED_SCROLL_LOCK 0 #define PS2_LED_NUM_LOCK 1 @@ -71,13 +85,101 @@ POSSIBILITY OF SUCH DAMAGE. extern uint8_t ps2_error; -/* host role */ void ps2_host_init(void); uint8_t ps2_host_send(uint8_t data); uint8_t ps2_host_recv_response(void); uint8_t ps2_host_recv(void); void ps2_host_set_led(uint8_t usb_led); -/* device role */ + +/* Check port settings for clock and data line */ +#if !(defined(PS2_CLOCK_PORT) && \ + defined(PS2_CLOCK_PIN) && \ + defined(PS2_CLOCK_DDR) && \ + defined(PS2_CLOCK_BIT)) +# error "PS/2 clock port setting is required in config.h" +#endif + +#if !(defined(PS2_DATA_PORT) && \ + defined(PS2_DATA_PIN) && \ + defined(PS2_DATA_DDR) && \ + defined(PS2_DATA_BIT)) +# error "PS/2 data port setting is required in config.h" +#endif + +/*-------------------------------------------------------------------- + * static functions + *------------------------------------------------------------------*/ +static inline void clock_lo(void) +{ + PS2_CLOCK_PORT &= ~(1<<PS2_CLOCK_BIT); + PS2_CLOCK_DDR |= (1<<PS2_CLOCK_BIT); +} +static inline void clock_hi(void) +{ + /* input with pull up */ + PS2_CLOCK_DDR &= ~(1<<PS2_CLOCK_BIT); + PS2_CLOCK_PORT |= (1<<PS2_CLOCK_BIT); +} +static inline bool clock_in(void) +{ + 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(void) +{ + PS2_DATA_PORT &= ~(1<<PS2_DATA_BIT); + PS2_DATA_DDR |= (1<<PS2_DATA_BIT); +} +static inline void data_hi(void) +{ + /* input with pull up */ + PS2_DATA_DDR &= ~(1<<PS2_DATA_BIT); + PS2_DATA_PORT |= (1<<PS2_DATA_BIT); +} +static inline bool data_in(void) +{ + 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(); +} #endif diff --git a/protocol/ps2_busywait.c b/protocol/ps2_busywait.c new file mode 100644 index 0000000000..05dd7b27e6 --- /dev/null +++ b/protocol/ps2_busywait.c @@ -0,0 +1,185 @@ +/* +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 <util/delay.h> +#include "ps2.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) +{ + // POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20) + _delay_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(); + _delay_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++) { + _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); + + 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); +} diff --git a/protocol/ps2.c b/protocol/ps2_interrupt.c index e5873a9bfa..259d254007 100644 --- a/protocol/ps2.c +++ b/protocol/ps2_interrupt.c @@ -35,47 +35,15 @@ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ +/* + * PS/2 protocol Pin interrupt version + */ + #include <stdbool.h> -#include <avr/io.h> #include <avr/interrupt.h> #include <util/delay.h> #include "ps2.h" -#include "debug.h" - - -#ifndef PS2_USE_INT -static uint8_t recv_data(void); -#endif -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); - - -/* -Primitive PS/2 Library for AVR -============================== -Host side is only supported now. - - -I/O control ------------ -High state is asserted by input with pull up. - - -PS/2 References ---------------- -http://www.computer-engineering.org/ps2protocol/ -http://www.mcamafia.de/pdf/ibm_hitrc07.pdf -*/ +#include "print.h" #define WAIT(stat, us, err) do { \ @@ -89,35 +57,38 @@ http://www.mcamafia.de/pdf/ibm_hitrc07.pdf 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) { -#ifdef PS2_USE_INT + idle(); PS2_INT_INIT(); PS2_INT_ON(); - idle(); -#else - inhibit(); -#endif + // POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20) + //_delay_ms(2500); } -// TODO: send using interrupt if available uint8_t ps2_host_send(uint8_t data) { - uint8_t res = 0; bool parity = true; ps2_error = PS2_ERR_NONE; -#ifdef PS2_USE_INT + PS2_INT_OFF(); -#endif + /* terminate a transmission if we have */ inhibit(); - _delay_us(200); // at least 100us + _delay_us(100); // 100us [4]p.13, [5]p.50 - /* start bit [1] */ + /* 'Request to Send' and Start bit */ data_lo(); clock_hi(); - WAIT(clock_lo, 20000, 10); // may take 15ms at most until device starts clocking - /* data [2-9] */ + 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)) { @@ -129,15 +100,18 @@ uint8_t ps2_host_send(uint8_t data) WAIT(clock_hi, 50, 2); WAIT(clock_lo, 50, 3); } - /* parity [10] */ + + /* Parity bit */ _delay_us(15); if (parity) { data_hi(); } else { data_lo(); } WAIT(clock_hi, 50, 4); WAIT(clock_lo, 50, 5); - /* stop bit [11] */ + + /* Stop bit */ _delay_us(15); data_hi(); - /* ack [12] */ + + /* Ack */ WAIT(data_lo, 50, 6); WAIT(clock_lo, 50, 7); @@ -145,116 +119,35 @@ uint8_t ps2_host_send(uint8_t data) WAIT(clock_hi, 50, 8); WAIT(data_hi, 50, 9); -#ifdef PS2_USE_INT + idle(); PS2_INT_ON(); -#endif - res = ps2_host_recv_response(); + return ps2_host_recv_response(); ERROR: -#ifdef PS2_USE_INT - PS2_INT_ON(); idle(); -#else - inhibit(); -#endif - return res; + PS2_INT_ON(); + return 0; } -#ifndef PS2_USE_INT -/* receive data when host want else inhibit communication */ uint8_t ps2_host_recv_response(void) { - uint8_t data = 0; - -#ifdef PS2_USE_INT - PS2_INT_OFF(); -#endif - /* terminate a transmission if we have */ - inhibit(); - _delay_us(100); - - /* release lines(idle state) */ - idle(); - - /* wait start bit */ - wait_clock_lo(25000); // command response may take 20 ms at most - data = recv_data(); - - inhibit(); - return data; -} -#endif - -#ifndef PS2_USE_INT -uint8_t ps2_host_recv(void) -{ - return ps2_host_recv_response(); -} -#else -/* ring buffer to store ps/2 key data */ -#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 { - 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; + // 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); } - 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; + return pbuf_dequeue(); } /* get data received by interrupt */ uint8_t ps2_host_recv(void) { - if (ps2_error) { - print("x"); - phex(ps2_error); - ps2_host_send(0xFE); // request to resend + if (pbuf_has_data()) { ps2_error = PS2_ERR_NONE; + return pbuf_dequeue(); + } else { + ps2_error = PS2_ERR_NODATA; + return 0; } - idle(); - return pbuf_dequeue(); -} - -uint8_t ps2_host_recv_response(void) -{ - while (!pbuf_has_data()) ; - return pbuf_dequeue(); } ISR(PS2_INT_VECT) @@ -309,7 +202,6 @@ ISR(PS2_INT_VECT) if (!data_in()) goto ERROR; pbuf_enqueue(data); -//phex(data); goto DONE; break; default: @@ -317,7 +209,6 @@ ISR(PS2_INT_VECT) } goto RETURN; ERROR: - inhibit(); ps2_error = state; DONE: state = INIT; @@ -326,8 +217,6 @@ DONE: RETURN: return; } -#endif - /* send LED state to keyboard */ void ps2_host_set_led(uint8_t led) @@ -337,116 +226,53 @@ void ps2_host_set_led(uint8_t led) } -#ifndef PS2_USE_INT -/* called after start bit comes */ -static uint8_t recv_data(void) +/*-------------------------------------------------------------------- + * 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 data = 0; - bool parity = true; - ps2_error = PS2_ERR_NONE; - - /* start bit [1] */ - WAIT(clock_lo, 1, 1); - 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; + 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"); } - WAIT(clock_hi, 50, 7); - - /* stop bit [11] */ - WAIT(clock_lo, 50, 8); - WAIT(data_hi, 1, 9); - WAIT(clock_hi, 50, 10); - - return data; -ERROR: - return 0; -} -#endif - -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); + SREG = sreg; } -static inline bool data_in() +static inline uint8_t pbuf_dequeue(void) { - 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); -} + uint8_t val = 0; -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; + 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 uint16_t wait_data_hi(uint16_t us) +static inline bool pbuf_has_data(void) { - while (!data_in() && us) { asm(""); _delay_us(1); us--; } - return us; + uint8_t sreg = SREG; + cli(); + bool has_data = (pbuf_head != pbuf_tail); + SREG = sreg; + return has_data; } - -/* idle state that device can send */ -static inline void idle(void) +static inline void pbuf_clear(void) { - clock_hi(); - data_hi(); + uint8_t sreg = SREG; + cli(); + pbuf_head = pbuf_tail = 0; + SREG = sreg; } -/* inhibit device to send */ -static inline void inhibit(void) -{ - clock_lo(); - data_hi(); -} diff --git a/protocol/ps2_usart.c b/protocol/ps2_usart.c index 40c46c497c..c2d9d0a208 100644 --- a/protocol/ps2_usart.c +++ b/protocol/ps2_usart.c @@ -36,32 +36,14 @@ 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. + * PS/2 protocol USART version + */ - -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" +#include "print.h" #define WAIT(stat, us, err) do { \ @@ -75,18 +57,6 @@ http://www.mcamafia.de/pdf/ibm_hitrc07.pdf 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); static inline bool pbuf_has_data(void); @@ -95,14 +65,15 @@ static inline void pbuf_clear(void); void ps2_host_init(void) { - idle(); + 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) { - uint8_t res = 0; bool parity = true; ps2_error = PS2_ERR_NONE; @@ -110,13 +81,14 @@ uint8_t ps2_host_send(uint8_t data) /* terminate a transmission if we have */ inhibit(); - _delay_us(100); + _delay_us(100); // [4]p.13 - /* start bit [1] */ + /* 'Request to Send' and Start bit */ data_lo(); clock_hi(); - WAIT(clock_lo, 15000, 1); - /* data [2-9] */ + 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)) { @@ -128,15 +100,18 @@ uint8_t ps2_host_send(uint8_t data) WAIT(clock_hi, 50, 2); WAIT(clock_lo, 50, 3); } - /* parity [10] */ + + /* Parity bit */ _delay_us(15); if (parity) { data_hi(); } else { data_lo(); } WAIT(clock_hi, 50, 4); WAIT(clock_lo, 50, 5); - /* stop bit [11] */ + + /* Stop bit */ _delay_us(15); data_hi(); - /* ack [12] */ + + /* Ack */ WAIT(data_lo, 50, 6); WAIT(clock_lo, 50, 7); @@ -144,127 +119,55 @@ uint8_t ps2_host_send(uint8_t data) WAIT(clock_hi, 50, 8); WAIT(data_hi, 50, 9); + idle(); PS2_USART_INIT(); PS2_USART_RX_INT_ON(); - res = ps2_host_recv_response(); + return ps2_host_recv_response(); ERROR: idle(); PS2_USART_INIT(); PS2_USART_RX_INT_ON(); - return res; + return 0; } -// Do polling data from keyboard to get response to last command. uint8_t ps2_host_recv_response(void) { - while (!pbuf_has_data()) { - _delay_ms(1); // without this delay it seems to fall into deadlock + // 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) { - return pbuf_dequeue(); + 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) { - uint8_t error = PS2_USART_ERROR; + // 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) { - // 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(); + ps2_host_send(0xED); + ps2_host_send(led); } @@ -284,11 +187,10 @@ static inline void pbuf_enqueue(uint8_t data) pbuf[pbuf_head] = data; pbuf_head = next; } else { - debug("pbuf: full\n"); + print("pbuf: full\n"); } SREG = sreg; } - static inline uint8_t pbuf_dequeue(void) { uint8_t val = 0; |