uint8_t matrix_scan(void)
{
// scan code reading states
static enum {
RESET,
RESET_RESPONSE,
KBD_ID0,
KBD_ID1,
CONFIG,
READY,
F0,
} state = RESET;
is_modified = false;
uint8_t code;
if ((code = ps2_host_recv())) {
debug("r"); debug_hex(code); debug(" ");
}
switch (state) {
case RESET:
debug("wFF ");
if (ps2_host_send(0xFF) == 0xFA) {
debug("[ack]\nRESET_RESPONSE: ");
state = RESET_RESPONSE;
}
break;
case RESET_RESPONSE:
if (code == 0xAA) {
debug("[ok]\nKBD_ID: ");
state = KBD_ID0;
} else if (code) {
debug("err\nRESET: ");
state = RESET;
}
break;
// after reset receive keyboad ID(2 bytes)
case KBD_ID0:
if (code) {
state = KBD_ID1;
}
break;
case KBD_ID1:
if (code) {
debug("\nCONFIG: ");
state = CONFIG;
}
break;
case CONFIG:
debug("wF8 ");
if (ps2_host_send(0xF8) == 0xFA) {
debug("[ack]\nREADY\n");
state = READY;
}
break;
case READY:
switch (code) {
case 0x00:
break;
case 0xF0:
state = F0;
debug(" ");
break;
default: // normal key make
if (code < 0x88) {
matrix_make(code);
} else {
debug("unexpected scan code at READY: "); debug_hex(code); debug("\n");
}
state = READY;
debug("\n");
}
break;
case F0: // Break code
switch (code) {
case 0x00:
break;
default:
if (code < 0x88) {
matrix_break(code);
} else {
debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
}
state = READY;
debug("\n");
}
break;
}
return 1;
}
/*
* PS/2 Scan Code Set 2: Exceptional Handling
*
* There are several keys to be handled exceptionally.
* The scan code for these keys are varied or prefix/postfix'd
* depending on modifier key state.
*
* Keyboard Scan Code Specification:
* http://www.microsoft.com/whdc/archive/scancode.mspx
* http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc
*
*
* 1) Insert, Delete, Home, End, PageUp, PageDown, Up, Down, Right, Left
* a) when Num Lock is off
* modifiers | make | break
* ----------+---------------------------+----------------------
* Ohter | <make> | <break>
* LShift | E0 F0 12 <make> | <break> E0 12
* RShift | E0 F0 59 <make> | <break> E0 59
* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
*
* b) when Num Lock is on
* modifiers | make | break
* ----------+---------------------------+----------------------
* Other | E0 12 <make> | <break> E0 F0 12
* Shift'd | <make> | <break>
*
* Handling: These prefix/postfix codes are ignored.
*
*
* 2) Keypad /
* modifiers | make | break
* ----------+---------------------------+----------------------
* Ohter | <make> | <break>
* LShift | E0 F0 12 <make> | <break> E0 12
* RShift | E0 F0 59 <make> | <break> E0 59
* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
*
* Handling: These prefix/postfix codes are ignored.
*
*
* 3) PrintScreen
* modifiers | make | break
* ----------+--------------+-----------------------------------
* Other | E0 12 E0 7C | E0 F0 7C E0 F0 12
* Shift'd | E0 7C | E0 F0 7C
* Control'd | E0 7C | E0 F0 7C
* Alt'd | 84 | F0 84
*
* Handling: These prefix/postfix codes are ignored, and both scan codes
* 'E0 7C' and 84 are seen as PrintScreen.
*
* 4) Pause
* modifiers | make(no break code)
* ----------+--------------------------------------------------
* Other | E1 14 77 E1 F0 14 F0 77
* Control'd | E0 7E E0 F0 7E
*
* Handling: Both code sequences are treated as a whole.
* And we need a ad hoc 'pseudo break code' hack to get the key off
* because it has no break code.
*
*/
uint8_t matrix_scan(void)
{
// scan code reading states
static enum {
INIT,
F0,
E0,
E0_F0,
// Pause
E1,
E1_14,
E1_14_77,
E1_14_77_E1,
E1_14_77_E1_F0,
E1_14_77_E1_F0_14,
E1_14_77_E1_F0_14_F0,
// Control'd Pause
E0_7E,
E0_7E_E0,
E0_7E_E0_F0,
} state = INIT;
is_modified = false;
// 'pseudo break code' hack
if (matrix_is_on(ROW(PAUSE), COL(PAUSE))) {
matrix_break(PAUSE);
}
uint8_t code = ps2_host_recv();
if (!ps2_error) {
switch (state) {
case INIT:
switch (code) {
case 0xE0:
state = E0;
break;
case 0xF0:
state = F0;
break;
case 0xE1:
state = E1;
break;
case 0x83: // F7
matrix_make(F7);
state = INIT;
break;
case 0x84: // Alt'd PrintScreen
matrix_make(PRINT_SCREEN);
state = INIT;
break;
case 0x00: // Overrun [3]p.25
matrix_clear();
clear_keyboard();
print("Overrun\n");
state = INIT;
break;
default: // normal key make
if (code < 0x80) {
matrix_make(code);
} else {
matrix_clear();
clear_keyboard();
xprintf("unexpected scan code at INIT: %02X\n", code);
}
state = INIT;
}
break;
case E0: // E0-Prefixed
switch (code) {
case 0x12: // to be ignored
case 0x59: // to be ignored
state = INIT;
break;
case 0x7E: // Control'd Pause
state = E0_7E;
break;
case 0xF0:
state = E0_F0;
break;
default:
if (code < 0x80) {
matrix_make(code|0x80);
} else {
matrix_clear();
clear_keyboard();
xprintf("unexpected scan code at E0: %02X\n", code);
}
state = INIT;
}
break;
case F0: // Break code
switch (code) {
case 0x83: // F7
matrix_break(F7);
state = INIT;
break;
case 0x84: // Alt'd PrintScreen
matrix_break(PRINT_SCREEN);
state = INIT;
break;
case 0xF0:
matrix_clear();
clear_keyboard();
xprintf("unexpected scan code at F0: F0(clear and cont.)\n");
break;
default:
if (code < 0x80) {
matrix_break(code);
} else {
matrix_clear();
clear_keyboard();
xprintf("unexpected scan code at F0: %02X\n", code);
}
state = INIT;
}
break;
case E0_F0: // Break code of E0-prefixed
switch (code) {
case 0x12: // to be ignored
case 0x59: // to be ignored
state = INIT;
break;
default:
if (code < 0x80) {
matrix_break(code|0x80);
} else {
matrix_clear();
clear_keyboard();
xprintf("unexpected scan code at E0_F0: %02X\n", code);
}
state = INIT;
}
break;
// following are states of Pause
case E1:
switch (code) {
case 0x14:
state = E1_14;
break;
default:
state = INIT;
}
break;
case E1_14:
switch (code) {
case 0x77:
state = E1_14_77;
break;
default:
state = INIT;
}
break;
case E1_14_77:
switch (code) {
case 0xE1:
state = E1_14_77_E1;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1:
switch (code) {
case 0xF0:
state = E1_14_77_E1_F0;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1_F0:
switch (code) {
case 0x14:
state = E1_14_77_E1_F0_14;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1_F0_14:
switch (code) {
case 0xF0:
state = E1_14_77_E1_F0_14_F0;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1_F0_14_F0:
switch (code) {
case 0x77:
matrix_make(PAUSE);
state = INIT;
break;
default:
state = INIT;
}
break;
// Following are states of Control'd Pause
case E0_7E:
if (code == 0xE0)
state = E0_7E_E0;
else
state = INIT;
break;
case E0_7E_E0:
if (code == 0xF0)
state = E0_7E_E0_F0;
else
state = INIT;
break;
case E0_7E_E0_F0:
if (code == 0x7E)
matrix_make(PAUSE);
state = INIT;
break;
default:
state = INIT;
}
}
// TODO: request RESEND when error occurs?
/*
if (PS2_IS_FAILED(ps2_error)) {
uint8_t ret = ps2_host_send(PS2_RESEND);
xprintf("Resend: %02X\n", ret);
}
*/
return 1;
}
/*
* PS/2 Scan Code Set 2: Exceptional Handling
*
* There are several keys to be handled exceptionally.
* The scan code for these keys are varied or prefix/postfix'd
* depending on modifier key state.
*
* References:
* http://www.microsoft.com/whdc/archive/scancode.mspx
* http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc
*
*
* Insert, Delete, Home, End, PageUp, PageDown, Up, Down, Right, Left:
* Num Lock: off
* modifiers | make | break
* ----------+---------------------------+----------------------
* Ohter | <make> | <break>
* LShift | E0 F0 12 <make> | <break> E0 12
* RShift | E0 F0 59 <make> | <break> E0 59
* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
*
* Num Lock: on
* modifiers | make | break
* ----------+---------------------------+----------------------
* Other | E0 12 <make> | <break> E0 F0 12
* Shift'd | <make> | <break>
*
* Handling: ignore these prefix/postfix codes
*
*
* Keypad-/:
* modifiers | make | break
* ----------+---------------------------+----------------------
* Ohter | <make> | <break>
* LShift | E0 F0 12 <make> | <break> E0 12
* RShift | E0 F0 59 <make> | <break> E0 59
* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
*
* Handling: ignore these prefix/postfix codes
*
*
* PrintScreen:
* With hoding down modifiers, the scan code is sent as following:
*
* modifiers | make | break
* ----------+--------------+-----------------------------------
* Other | E0 12 E0 7C | E0 F0 7C E0 F0 12
* Shift'd | E0 7C | E0 F0 7C
* Control'd | E0 7C | E0 F0 7C
* Alt'd | 84 | F0 84
*
* Handling: ignore prefix/postfix codes and treat both scan code
* E0 7C and 84 as PrintScreen.
*
* Pause:
* With hoding down modifiers, the scan code is sent as following:
*
* modifiers | make(no break code)
* ----------+--------------------------------------------------
* no mods | E1 14 77 E1 F0 14 F0 77
* Control'd | E0 7E E0 F0 7E
*
* Handling: treat these two code sequence as Pause
*
*/
uint8_t matrix_scan(void)
{
static enum {
INIT,
F0,
E0,
E0_F0,
// states for Pause/Break
E1,
E1_14,
E1_14_77,
E1_14_77_E1,
E1_14_77_E1_F0,
E1_14_77_E1_F0_14,
E1_14_77_E1_F0_14_F0,
} state = INIT;
is_modified = false;
// Pause/Break off(PS/2 has no break for this key)
if (matrix_is_on(ROW(PAUSE), COL(PAUSE))) {
matrix_break(PAUSE);
}
uint8_t code;
while ((code = ps2_host_recv())) {
switch (state) {
case INIT:
switch (code) {
case 0xE0: // 2byte make
state = E0;
break;
case 0xF0: // break code
state = F0;
break;
case 0xE1: // Pause/Break
state = E1;
break;
case 0x83: // F8
matrix_make(F8);
state = INIT;
break;
case 0x84: // PrintScreen
matrix_make(PRINT_SCREEN);
state = INIT;
break;
default: // normal key make
if (code < 0x80) {
matrix_make(code);
} else {
debug("unexpected scan code at INIT: "); debug_hex(code); debug("\n");
}
state = INIT;
}
break;
case E0:
switch (code) {
case 0x12: // postfix/postfix code for exceptional keys
case 0x59: // postfix/postfix code for exceptional keys
// ignore
state = INIT;
break;
case 0x7E: // former part of Control-Pause[E0 7E E0 F0 7E]
matrix_make(PAUSE);
state = INIT;
break;
case 0xF0: // E0 break
state = E0_F0;
break;
default: // E0 make
if (code < 0x80) {
matrix_make(code|0x80);
} else {
debug("unexpected scan code at E0: "); debug_hex(code); debug("\n");
}
state = INIT;
}
break;
case F0:
switch (code) {
case 0x83:
matrix_break(F8);
state = INIT;
break;
case 0x84:
matrix_break(PRINT_SCREEN);
state = INIT;
break;
default:
if (code < 0x80) {
matrix_break(code);
} else {
debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
}
state = INIT;
}
break;
case E0_F0: // E0 break
switch (code) {
case 0x12: // postfix/postfix code for exceptional keys
case 0x59: // postfix/postfix code for exceptional keys
case 0x7E: // latter part of Control-Pause[E0 7E E0 F0 7E]
// ignore
state = INIT;
break;
default:
if (code < 0x80) {
matrix_break(code|0x80);
} else {
debug("unexpected scan code at E0_F0: "); debug_hex(code); debug("\n");
}
state = INIT;
}
break;
/* Pause */
case E1:
switch (code) {
case 0x14:
state = E1_14;
break;
default:
state = INIT;
}
break;
case E1_14:
switch (code) {
case 0x77:
state = E1_14_77;
break;
default:
state = INIT;
}
break;
case E1_14_77:
switch (code) {
case 0xE1:
state = E1_14_77_E1;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1:
switch (code) {
case 0xF0:
state = E1_14_77_E1_F0;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1_F0:
switch (code) {
case 0x14:
state = E1_14_77_E1_F0_14;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1_F0_14:
switch (code) {
case 0xF0:
state = E1_14_77_E1_F0_14_F0;
break;
default:
state = INIT;
}
break;
case E1_14_77_E1_F0_14_F0:
switch (code) {
case 0x77:
matrix_make(PAUSE);
state = INIT;
break;
default:
state = INIT;
}
break;
default:
state = INIT;
}
phex(code);
}
return 1;
}