diff options
Diffstat (limited to 'protocol/ps2.c')
| -rw-r--r-- | protocol/ps2.c | 59 |
1 files changed, 38 insertions, 21 deletions
diff --git a/protocol/ps2.c b/protocol/ps2.c index e5873a9bf..4886b16d0 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 + */ |