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ibmpc_usb: Add some comments

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tmk 2020-04-28 12:14:47 +09:00
parent c4f65d4f5e
commit aa276d55c4
1 changed files with 11 additions and 0 deletions
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11
converter/ibmpc_usb/ibmpc_usb.c
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@ -68,6 +68,7 @@ static uint16_t read_keyboard_id(void)
if (code == -1) { id = 0x0000; goto DONE; } // AT if (code == -1) { id = 0x0000; goto DONE; } // AT
id = (code & 0xFF)<<8; id = (code & 0xFF)<<8;
// Mouse responds with one-byte 00, this returns 00FF [y] p.14
code = read_wait(500); code = read_wait(500);
id |= code & 0xFF; id |= code & 0xFF;
@ -218,6 +219,12 @@ uint8_t matrix_scan(void)
case READ_ID: case READ_ID:
xprintf("R%u ", timer_read()); xprintf("R%u ", timer_read());
// SKIDATA-2-DE(and some other keyboards?) stores 'Code Set' setting in nonvlatile memory
// and keeps it until receiving reset. Sending reset here may be useful to clear it, perhaps.
// https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-AT-Keyboard-Protocol#select-alternate-scan-codesf0
//ibmpc_host_send(0xFF); // reset command
//read_wait(500); // BAT takes 600-900ms(84-key) or 300-500ms(101/102-key) [8] 4-7, 4-39
keyboard_id = read_keyboard_id(); keyboard_id = read_keyboard_id();
if (ibmpc_error) { if (ibmpc_error) {
xprintf("\nERR:%02X\n", ibmpc_error); xprintf("\nERR:%02X\n", ibmpc_error);
@ -266,6 +273,7 @@ uint8_t matrix_scan(void)
led_set(host_keyboard_leds()); led_set(host_keyboard_leds());
break; break;
case PC_TERMINAL: case PC_TERMINAL:
// Set all keys to make/break type
ibmpc_host_send(0xF8); ibmpc_host_send(0xF8);
break; break;
default: default:
@ -1057,6 +1065,9 @@ static int8_t process_cs3(void)
* [7] The IBM 6110344 Keyboard - Scan Code Set 3 of 122-key terminal keyboard * [7] The IBM 6110344 Keyboard - Scan Code Set 3 of 122-key terminal keyboard
* https://www.seasip.info/VintagePC/ibm_6110344.html * https://www.seasip.info/VintagePC/ibm_6110344.html
* *
* [8] IBM PC AT Technical Reference 1986
* http://bitsavers.org/pdf/ibm/pc/at/6183355_PC_AT_Technical_Reference_Mar86.pdf
*
* [y] TrackPoint Engineering Specifications for version 3E * [y] TrackPoint Engineering Specifications for version 3E
* https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html * https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
* *