- // valid scancode: 00-77h
- for (uint8_t code = 0; code < 0x78; code++) {
- while (ibm4704_send(0x80|code) != 0) {
- print("z");
- _delay_us(500);
- }
- _delay_us(2000);
- ret = ibm4704_recv();
- if (ret != 0xff) {
- xprintf("c%02X:r%02X ", code, ret);
- }
- _delay_us(1000);
+ while (ibm4704_send(0xFC)) { _delay_ms(10); }
+ // valid scancode: 00-79h
+ for (uint8_t code = 0; code < 0x7F; code++) {
+ while (ibm4704_send(0x80|code)) _delay_ms(10);
+ _delay_ms(5); // wait for response
+ // No response(FF) when ok, FD when out of bound
+ xprintf("s%02X:r%02X ", code, ibm4704_recv());