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ibmpc: Protocol detection between AT and XT

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This commit is contained in:
tmk 2020-03-02 11:02:48 +09:00
parent 0481aa08e5
commit 2c9ae5ac95
2 changed files with 9 additions and 6 deletions
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7
tmk_core/protocol/ibmpc.c
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@ -56,7 +56,7 @@ POSSIBILITY OF SUCH DAMAGE.
} while (0)
volatile uint8_t ibmpc_protocol = IBMPC_PROTOCOL_AT;
volatile uint8_t ibmpc_protocol = IBMPC_PROTOCOL_NO;
volatile uint8_t ibmpc_error = IBMPC_ERR_NONE;
/* 2-byte buffer for data received from keyhboard
@ -97,8 +97,6 @@ int16_t ibmpc_host_send(uint8_t data)
bool parity = true;
ibmpc_error = IBMPC_ERR_NONE;
if (ibmpc_protocol == IBMPC_PROTOCOL_XT) return -1;
dprintf("w%02X ", data);
IBMPC_INT_OFF();
@ -269,6 +267,7 @@ ISR(IBMPC_INT_VECT)
case 0b11000000:
// XT_Clone-done
isr_state = isr_state>>8;
ibmpc_protocol = IBMPC_PROTOCOL_XT_CLONE;
goto DONE;
break;
case 0b10100000: // ^2
@ -284,6 +283,7 @@ ISR(IBMPC_INT_VECT)
} else {
// no stop bit: XT_IBM-done
isr_state = isr_state>>8;
ibmpc_protocol = IBMPC_PROTOCOL_XT_IBM;
goto DONE;
}
}
@ -295,6 +295,7 @@ ISR(IBMPC_INT_VECT)
// AT-done
// TODO: parity check?
isr_state = isr_state>>6;
ibmpc_protocol = IBMPC_PROTOCOL_AT;
goto DONE;
break;
case 0b01100000:

8
tmk_core/protocol/ibmpc.h
View file

@ -70,10 +70,12 @@ POSSIBILITY OF SUCH DAMAGE.
#define IBMPC_RESEND 0xFE
#define IBMPC_SET_LED 0xED
#define IBMPC_PROTOCOL_AT 0
#define IBMPC_PROTOCOL_XT 1
#define IBMPC_PROTOCOL_NO 0
#define IBMPC_PROTOCOL_AT 1
#define IBMPC_PROTOCOL_XT_IBM 2
#define IBMPC_PROTOCOL_XT_CLONE 3
// TODO: error numbers
// Error numbers
#define IBMPC_ERR_NONE 0
#define IBMPC_ERR_RECV 0x00
#define IBMPC_ERR_SEND 0x10