443 lines
12 KiB
C
443 lines
12 KiB
C
/*
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* scan matrix
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "print.h"
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#include "util.h"
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#include "debug.h"
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#include "ps2.h"
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#include "matrix.h"
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#if (MATRIX_COLS > 16)
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# error "MATRIX_COLS must not exceed 16"
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#endif
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#if (MATRIX_ROWS > 255)
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# error "MATRIX_ROWS must not exceed 255"
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#endif
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/*
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* Matrix usage:
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* "PS/2 Scan Codes Set 2" is assigned to 256(32x8)cells matrix.
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* Hmm, It is very sparse and not efficient :(
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*
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* 8bit
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* ---------
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* 0| |
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* :| XX | 00-7F for normal codes(without E0-prefix)
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* f|_________|
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* 10| |
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* :| E0 XX | 80-FF for E0-prefix codes(use (XX|0x80) as code)
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* 1f| |
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* ---------
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* exceptions:
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* 83: F8[0x83](normal codes but > 0x7F)
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* FC: PrintScreen[E0 7C or 84]
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* FE: Puause
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*/
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#define F8 (0x83)
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#define PRINT_SCREEN (0xFC)
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#define PAUSE (0xFE)
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#define ROW(code) (code>>3)
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#define COL(code) (code&0x07)
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static bool is_modified = false;
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// matrix state buffer(1:on, 0:off)
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#if (MATRIX_COLS <= 8)
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static uint8_t matrix[MATRIX_ROWS];
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#else
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static uint16_t matrix[MATRIX_ROWS];
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#endif
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#ifdef MATRIX_HAS_GHOST
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static bool matrix_has_ghost_in_row(uint8_t row);
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#endif
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static void matrix_make(uint8_t code);
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static void matrix_break(uint8_t code);
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inline
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uint8_t matrix_rows(void)
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{
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void)
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{
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return MATRIX_COLS;
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}
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void matrix_init(void)
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{
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ps2_host_init();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
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return;
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}
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/*
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* PS/2 Scan Code Set 2: Exceptional Handling
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*
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* There are several keys to be handled exceptionally.
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* The scan code for these keys are varied or prefix/postfix'd
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* depending on modifier key state.
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*
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* References:
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* http://www.microsoft.com/whdc/archive/scancode.mspx
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* http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc
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*
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*
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* Insert, Delete, Home, End, PageUp, PageDown, Up, Down, Right, Left:
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* Num Lock: off
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* modifiers | make | break
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* ----------+---------------------------+----------------------
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* Ohter | <make> | <break>
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* LShift | E0 F0 12 <make> | <break> E0 12
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* RShift | E0 F0 59 <make> | <break> E0 59
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* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
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*
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* Num Lock: on
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* modifiers | make | break
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* ----------+---------------------------+----------------------
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* Other | E0 12 <make> | <break> E0 F0 12
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* Shift'd | <make> | <break>
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*
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* Handling: ignore these prefix/postfix codes
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*
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*
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* Keypad-/:
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* modifiers | make | break
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* ----------+---------------------------+----------------------
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* Ohter | <make> | <break>
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* LShift | E0 F0 12 <make> | <break> E0 12
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* RShift | E0 F0 59 <make> | <break> E0 59
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* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
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*
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* Handling: ignore these prefix/postfix codes
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*
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*
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* PrintScreen:
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* With hoding down modifiers, the scan code is sent as following:
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*
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* modifiers | make | break
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* ----------+--------------+-----------------------------------
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* Other | E0 12 E0 7C | E0 F0 7C E0 F0 12
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* Shift'd | E0 7C | E0 F0 7C
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* Control'd | E0 7C | E0 F0 7C
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* Alt'd | 84 | F0 84
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*
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* Handling: ignore prefix/postfix codes and treat both scan code
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* E0 7C and 84 as PrintScreen.
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*
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* Pause:
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* With hoding down modifiers, the scan code is sent as following:
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*
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* modifiers | make(no break code)
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* ----------+--------------------------------------------------
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* no mods | E1 14 77 E1 F0 14 F0 77
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* Control'd | E0 7E E0 F0 7E
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*
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* Handling: treat these two code sequence as Pause
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*
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*/
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uint8_t matrix_scan(void)
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{
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static enum {
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INIT,
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F0,
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E0,
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E0_F0,
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// states for Pause/Break
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E1,
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E1_14,
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E1_14_77,
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E1_14_77_E1,
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E1_14_77_E1_F0,
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E1_14_77_E1_F0_14,
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E1_14_77_E1_F0_14_F0,
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} state = INIT;
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is_modified = false;
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// Pause/Break off(PS/2 has no break for this key)
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if (matrix_is_on(ROW(PAUSE), COL(PAUSE))) {
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matrix_break(PAUSE);
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}
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uint8_t code;
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while ((code = ps2_host_recv())) {
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switch (state) {
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case INIT:
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switch (code) {
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case 0xE0: // 2byte make
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state = E0;
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break;
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case 0xF0: // break code
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state = F0;
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break;
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case 0xE1: // Pause/Break
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state = E1;
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break;
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case 0x83: // F8
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matrix_make(F8);
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state = INIT;
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break;
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case 0x84: // PrintScreen
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matrix_make(PRINT_SCREEN);
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state = INIT;
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break;
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default: // normal key make
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if (code < 0x80) {
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matrix_make(code);
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} else {
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debug("unexpected scan code at INIT: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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case E0:
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switch (code) {
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case 0x12: // postfix/postfix code for exceptional keys
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case 0x59: // postfix/postfix code for exceptional keys
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// ignore
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state = INIT;
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break;
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case 0x7E: // former part of Control-Pause[E0 7E E0 F0 7E]
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matrix_make(PAUSE);
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state = INIT;
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break;
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case 0xF0: // E0 break
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state = E0_F0;
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break;
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default: // E0 make
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if (code < 0x80) {
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matrix_make(code|0x80);
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} else {
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debug("unexpected scan code at E0: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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case F0:
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switch (code) {
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case 0x83:
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matrix_break(F8);
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state = INIT;
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break;
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case 0x84:
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matrix_break(PRINT_SCREEN);
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state = INIT;
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break;
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default:
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if (code < 0x80) {
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matrix_break(code);
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} else {
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debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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case E0_F0: // E0 break
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switch (code) {
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case 0x12: // postfix/postfix code for exceptional keys
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case 0x59: // postfix/postfix code for exceptional keys
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case 0x7E: // latter part of Control-Pause[E0 7E E0 F0 7E]
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// ignore
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state = INIT;
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break;
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default:
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if (code < 0x80) {
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matrix_break(code|0x80);
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} else {
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debug("unexpected scan code at E0_F0: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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/* Pause */
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case E1:
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switch (code) {
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case 0x14:
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state = E1_14;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14:
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switch (code) {
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case 0x77:
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state = E1_14_77;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77:
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switch (code) {
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case 0xE1:
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state = E1_14_77_E1;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1:
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switch (code) {
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case 0xF0:
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state = E1_14_77_E1_F0;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1_F0:
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switch (code) {
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case 0x14:
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state = E1_14_77_E1_F0_14;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1_F0_14:
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switch (code) {
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case 0xF0:
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state = E1_14_77_E1_F0_14_F0;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1_F0_14_F0:
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switch (code) {
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case 0x77:
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matrix_make(PAUSE);
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state = INIT;
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break;
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default:
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state = INIT;
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}
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break;
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default:
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state = INIT;
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}
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}
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return 1;
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}
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bool matrix_is_modified(void)
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{
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return is_modified;
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}
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inline
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bool matrix_has_ghost(void)
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{
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#ifdef MATRIX_HAS_GHOST
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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if (matrix_has_ghost_in_row(i))
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return true;
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}
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#endif
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return false;
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}
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inline
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bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & (1<<col));
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}
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inline
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#if (MATRIX_COLS <= 8)
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uint8_t matrix_get_row(uint8_t row)
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#else
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uint16_t matrix_get_row(uint8_t row)
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#endif
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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#if (MATRIX_COLS <= 8)
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print("\nr/c 01234567\n");
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#else
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print("\nr/c 0123456789ABCDEF\n");
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#endif
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for (uint8_t row = 0; row < matrix_rows(); row++) {
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phex(row); print(": ");
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#if (MATRIX_COLS <= 8)
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pbin_reverse(matrix_get_row(row));
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#else
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pbin_reverse16(matrix_get_row(row));
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#endif
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#ifdef MATRIX_HAS_GHOST
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if (matrix_has_ghost_in_row(row)) {
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print(" <ghost");
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}
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#endif
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print("\n");
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}
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}
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uint8_t matrix_key_count(void)
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{
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uint8_t count = 0;
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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#if (MATRIX_COLS <= 8)
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count += bitpop(matrix[i]);
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#else
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count += bitpop16(matrix[i]);
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#endif
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}
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return count;
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}
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#ifdef MATRIX_HAS_GHOST
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inline
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static bool matrix_has_ghost_in_row(uint8_t row)
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{
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// no ghost exists in case less than 2 keys on
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if (((matrix[row] - 1) & matrix[row]) == 0)
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return false;
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// ghost exists in case same state as other row
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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if (i != row && (matrix[i] & matrix[row]) == matrix[row])
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return true;
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}
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return false;
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}
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#endif
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inline
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static void matrix_make(uint8_t code)
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{
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if (!matrix_is_on(ROW(code), COL(code))) {
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matrix[ROW(code)] |= 1<<COL(code);
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is_modified = true;
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}
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}
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inline
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static void matrix_break(uint8_t code)
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{
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if (matrix_is_on(ROW(code), COL(code))) {
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matrix[ROW(code)] &= ~(1<<COL(code));
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is_modified = true;
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}
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}
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