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-rw-r--r--protocol/ps2.c59
-rw-r--r--protocol/ps2.h144
-rw-r--r--protocol/ps2_busywait.c179
3 files changed, 339 insertions, 43 deletions
diff --git a/protocol/ps2.c b/protocol/ps2.c
index e5873a9bfa..4886b16d03 100644
--- a/protocol/ps2.c
+++ b/protocol/ps2.c
@@ -91,6 +91,9 @@ 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);
+
#ifdef PS2_USE_INT
PS2_INT_INIT();
PS2_INT_ON();
@@ -163,32 +166,30 @@ ERROR:
/* receive data when host want else inhibit communication */
uint8_t ps2_host_recv_response(void)
{
+ // Command might take 20ms to response([3]p.21)
+ // TrackPoint might take 25ms ([5]2.7)
uint8_t data = 0;
-
-#ifdef PS2_USE_INT
- PS2_INT_OFF();
+ uint8_t try = 200;
+ while (try-- && (data = ps2_host_recv())) ;
+ return data;
+}
#endif
- /* terminate a transmission if we have */
- inhibit();
- _delay_us(100);
+
+#ifndef PS2_USE_INT
+uint8_t ps2_host_recv(void)
+{
+ uint8_t data = 0;
/* release lines(idle state) */
idle();
/* wait start bit */
- wait_clock_lo(25000); // command response may take 20 ms at most
+ wait_clock_lo(100); // TODO: this is enough?
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
@@ -241,13 +242,6 @@ static inline void pbuf_clear(void)
/* 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
- ps2_error = PS2_ERR_NONE;
- }
- idle();
return pbuf_dequeue();
}
@@ -450,3 +444,26 @@ static inline void inhibit(void)
clock_lo();
data_hi();
}
+
+
+/* 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
+ */
diff --git a/protocol/ps2.h b/protocol/ps2.h
index 834165356c..b780d01a29 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 +37,44 @@ 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
+#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_LED_SCROLL_LOCK 0
#define PS2_LED_NUM_LOCK 1
@@ -71,13 +83,101 @@ 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..1e29258895
--- /dev/null
+++ b/protocol/ps2_busywait.c
@@ -0,0 +1,179 @@
+/*
+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.
+*/
+
+#include <stdbool.h>
+#include <util/delay.h>
+#include "ps2.h"
+#include "debug.h"
+
+
+/*
+ * PS/2 protocol busywait version
+ */
+
+#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)
+{
+ uint8_t res = 0;
+ bool parity = true;
+ ps2_error = PS2_ERR_NONE;
+ /* terminate a transmission if we have */
+ inhibit();
+ _delay_us(200); // at least 100us
+
+ /* start bit [1] */
+ data_lo();
+ clock_hi();
+ WAIT(clock_lo, 20000, 10); // may take 15ms at most until device starts clocking
+ /* data [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 [10] */
+ _delay_us(15);
+ if (parity) { data_hi(); } else { data_lo(); }
+ WAIT(clock_hi, 50, 4);
+ WAIT(clock_lo, 50, 5);
+ /* stop bit [11] */
+ _delay_us(15);
+ data_hi();
+ /* ack [12] */
+ WAIT(data_lo, 50, 6);
+ WAIT(clock_lo, 50, 7);
+
+ /* wait for idle state */
+ WAIT(clock_hi, 50, 8);
+ WAIT(data_hi, 50, 9);
+
+ res = ps2_host_recv_response();
+ERROR:
+ inhibit();
+ return res;
+}
+
+/* receive data when host want else inhibit communication */
+uint8_t ps2_host_recv_response(void)
+{
+ // TODO:
+ // Command might take 20ms to response([3]p.21)
+ // TrackPoint might take 25ms ([5]2.7)
+ uint8_t data = 0;
+ uint8_t try = 200;
+ while (try-- && (data = ps2_host_recv())) ;
+ return data;
+}
+
+/* send LED state to keyboard */
+void ps2_host_set_led(uint8_t led)
+{
+ ps2_host_send(0xED);
+ ps2_host_send(led);
+}
+
+
+/* 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) {
+ printf("x%02X\n", ps2_error);
+ }
+ inhibit();
+ return 0;
+}
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