| \ Kai
>| \\ Communications
>| \\\
>| ///
>| //
| /
| Item | Value | Comment |
|---|---|---|
| Vendor code | 0xA87C900E | (KaiComm) |
| Device type | 0x02 | (Communications) |
| Device Subtype | 0x02 | (Async serial) |
| Device ID | 0x17 | (GASI) |
| DCPU Device ID | 0x8BC9D6C7 | (KaiComm GASI 7) |
| Version | 0x010A |
The KaiComm GASI is a bi-directional multiuse data port using a 3 wire connection. Transmit and receive are independent, but must operate at the same baud. The size of the data primitive is selectable ranging from 1 to 4 octets, but each octet is framed seperately on the wire. All data are sent LSB first.
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0x0000: Query status
Sets Register A with status, bits will be set/clear as follows:- Bit 0 - Line is busy/not-connected (1), or idle (0)
- Bit 1 - Receiving Active (1), or idle (0)
- Bit 2 - Data available (1), or not (0)
- Bit 3 - Transmitting Active (1), or idle (0)
- Bit 4 - Transmit buffer is free (1), or full (0)
- Bit 5-13 Reserved always set to 0
- Bit 14 - Receive interrupts enabled: yes (1), no (0)
- Bit 15 - Transmit done interrupts enabled: yes(1), no (0)
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0x0001: Configure port
Register A holds options:- bits 0-1 - octet size minus 1.
- bit 2 - send/use parity - yes (1), no (0)
- bit 3 - parity mode (defines bit 5 function) - assert (1), make (0)
- bit 4 - (parity assert mode) - mark (1), space (0)
- bit 4 - (parity make mode) - odd (1), even (0)
- bit 5 - stop bit count - two (1), one (0)
- bit 6-15 - ignored.
Register B holds the baud selection (b) in bits 0-2, range of 0-7; bit 4 Divides the baud by 3 (d) The baud is calculated like so: baud = 115200 / (2 ^ b)), and then divided by 3 if bit 4 is set. Possible bauds range from 300 to 115,200 bits per second. Each octet is sent with 8 bits, 1 start bit, 1 or 2 stop bits, and optionally a "parity" bit. (10-14 bits per octet)
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0x0002: Receive data
Register A is set to the lower 16 bits, register B is set to the upper 16 bits.
Register C is set with the error status, receive error status is cleared when read.
when configured for less than 4 octets unused bits are set to 0.Receive Error status codes:
- 0x0000 - No error
- 0x0001 - Receive buffer overflow
- 0x0002 - Transmission framing error
- 0x0003 - No data available
- 0x0004 - Break
- 0x0005 - Parity fail
-
0x0003: Transmit data
Register A contains the lower 16 bits, register B contains the upper 16 bits.
when configured for less than 4 octets unused bits are ignored.
Register C is set with error status.Transmit Error status codes:
- 0x0000 - No error
- 0x0001 - Transmit buffer overflow (data will not be sent)
- 0x0002 - Line is busy or not connected (data will be queued)
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0x0004: Configure interrupts
Register A defines which interrupts to enable.- Bit 0 - Interrupt on Receive enabled: yes (1), no (0)
- Bit 1 - Interrupt on Transmit done enabled: yes(1), no (0)
- Bit 2-15 Ignored.
Register B contains message for Interrupt on Receive.
Register C contains message for Interrupt on Transmit. -
0x0005: Configure interrupt on break
Register A enables or disables.- Bit 0 - Interrupt on break received: enabled - yes (1), no (0)
- Bit 1-15 Ignored.
Register B contains message for Interrupt on break.
-
0x0006: Assert break
Transmits the break condition.
Register C is set with error status.Transmit Error status codes:
- 0x0000 - No error
- 0x0001 - Transmitter is busy
| Signal | Port pin |
|---|---|
| Tx Data | 1 |
| Common | 2 |
| Rx Data | 3 |
2014 Meisaka Yukara (CC-BY-SA 4.0)