static void pc98_inhibit_repeat(void)
{
uint16_t code;
-
- // clear recv buffer
- while (serial_recv()) ;
RETRY:
- _delay_ms(100);
pc98_send(0x9C);
code = pc98_wait_response();
- if (code != -1) xprintf("PC98: send 9C: %02X\n", code);
- if (code != 0xFA) goto RETRY;
+ if (code != -1) dprintf("send 9C: %02X\n", code);
+ if (code != 0xFA) return;
- _delay_ms(100);
pc98_send(0x70);
code = pc98_wait_response();
- if (code != -1) xprintf("PC98: send 70: %02X\n", code);
+ if (code != -1) dprintf("send 70: %02X\n", code);
+ if (code != 0xFA) goto RETRY;
+}
+
+static uint8_t pc98_led = 0;
+static void pc98_led_set(void)
+{
+ uint16_t code;
+RETRY:
+ pc98_send(0x9D);
+ code = pc98_wait_response();
+ if (code != -1) dprintf("send 9D: %02X\n", code);
+ if (code != 0xFA) return;
+
+ pc98_send(pc98_led);
+ code = pc98_wait_response();
+ if (code != -1) dprintf("send %02X: %02X\n", pc98_led, code);
if (code != 0xFA) goto RETRY;
}
void matrix_init(void)
{
- debug_keyboard = true;
PC98_RST_DDR |= (1<<PC98_RST_BIT);
PC98_RDY_DDR |= (1<<PC98_RDY_BIT);
PC98_RTY_DDR |= (1<<PC98_RTY_BIT);
serial_init();
// PC98 reset
-/*
- PC98_RST_PORT &= ~(1<<PC98_RST_BIT);
- _delay_us(15);
- PC98_RST_PORT |= (1<<PC98_RST_BIT);
- _delay_us(13);
- PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
-*/
+ // https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n359
+ PC98_RDY_PORT |= (1<<PC98_RDY_BIT); // RDY: high
+ PC98_RST_PORT &= ~(1<<PC98_RST_BIT); // RST: low
+ _delay_us(15); // > 13us
+ PC98_RST_PORT |= (1<<PC98_RST_BIT); // RST: high
- _delay_ms(500);
+ _delay_ms(50);
pc98_inhibit_repeat();
-
- // PC98 ready
- PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
-
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
- debug("init\n");
+ // ready to receive from keyboard
+ PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT); // RDY: low
+
return;
}
uint8_t matrix_scan(void)
{
uint16_t code;
- PC98_RDY_PORT |= (1<<PC98_RDY_BIT);
- //_delay_us(30);
code = serial_recv2();
- PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT);
- if (code == -1) return 0;
+ if (code == -1) {
+#ifdef PC98_LED_CONTROL
+ // Before sending command we have to make sure that there is no unprocessed key in queue
+ // otherwise keys will be missed during sending command
+ if (pc98_led) {
+ pc98_led_set();
+ pc98_led = 0;
+ }
+#endif
+ return 0;
+ }
- print_hex8(code); print(" ");
+ dprintf("%02X ", code);
if (code&0x80) {
// break code
matrix[ROW(code)] |= (1<<COL(code));
}
}
+
+ // PC-9801V keyboard requires RDY pulse.
+ // This is not optimal place though, it works.
+ PC98_RDY_PORT |= (1<<PC98_RDY_BIT); // RDY: high
+ _delay_us(20);
+ PC98_RDY_PORT &= ~(1<<PC98_RDY_BIT); // RDY: low
return code;
}
void led_set(uint8_t usb_led)
{
-#ifdef PC98_LED_CONTROL
- uint8_t led_state = 0x70;
- if (usb_led & (1<<USB_LED_NUM_LOCK)) led_state |= (1<<0);
- if (usb_led & (1<<USB_LED_CAPS_LOCK)) led_state |= (1<<2);
- xprintf("led_set: %02X\n", led_state);
-
- pc98_send(0x9D);
- _delay_ms(100);
- pc98_send(led_state);
- // responses(FA or FC) will be ignored in matrix_scan()
-#endif
+ // https://archive.org/stream/PC9800TechnicalDataBookHARDWARE1993/PC-9800TechnicalDataBook_HARDWARE1993#page/n161
+ // http://www.webtech.co.jp/company/doc/undocumented_mem/io_kb.txt
+ pc98_led = 0x70;
+ if (usb_led & (1<<USB_LED_NUM_LOCK)) pc98_led |= (1<<0);
+ if (usb_led & (1<<USB_LED_CAPS_LOCK)) pc98_led |= (1<<2);
+ dprintf("usb_led: %02X\n", usb_led);
+ dprintf("pc98_led: %02X\n", pc98_led);
}