ps2d_cmd.asm

Cypress cy7c63318 鼠标开发板的源代码

;;*****************************************************************************
;;*****************************************************************************
;;  FILENAME: PS2D_cmd.asm
;;   Version: 1.2, Updated on 2005/07/06 at 13:49:25
;;  Generated by PSoC Designer ver 4.2  b1013 : 02 September, 2004
;;
;;  DESCRIPTION: PS2D User Module command implementation file
;;               for the enCoRe II family of devices
;;
;;  NOTE: User Module APIs conform to the fastcall convention for marshalling
;;        arguments and observe the associated "Registers are volatile" policy.
;;        This means it is the caller's responsibility to preserve any values
;;        in the X and A registers that are still needed after the API
;;        function returns. Even though these registers may be preserved now,
;;        there is no guarantee they will be preserved in future releases.
;;-----------------------------------------------------------------------------
;;  Copyright (c) Cypress Semiconductor 2004. All Rights Reserved.
;;*****************************************************************************
;;*****************************************************************************

include "m8c.inc"
include "PS2D.inc"

;-----------------------------------------------
;  Global Symbols
;-----------------------------------------------
export  PS2D_DoCommand
export _PS2D_DoCommand
export PS2D_CmdError
export PS2D_CmdReset
export PS2D_CmdDisable
export PS2D_CmdEnable
export PS2D_CmdResend

;-----------------------------------------------
;  Persistent RAM Allocation
;-----------------------------------------------
AREA bss (RAM,REL)


AREA UserModules (ROM, REL)
;-----------------------------------------------------------------------------
;  FUNCTION NAME: PS2D_DoCommand
;
;  DESCRIPTION:   Process a host command if the host is requesting to send one
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:   None
;
;  RETURNS:  A = 0 if no command was processed
;            A = 1 if a command was processed
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 PS2D_DoCommand:
_PS2D_DoCommand:
    push x
    ; * Get a host byte
    ; *   Bail if none to receive
    call   PS2D_GetHostByte                  ; Get the host byte if one is available
    swap   a,x                               ; Swap bytes to make the check
    cmp    a, 0x00                           ; Zero signals we have a byte
    jnz    .no_cmd                           ; Bail on no host byte

; Flow here to process a command
.proc_cmd:
; Check if we are in wrap/echo mode, if so we need to
; determine if the command code is one that terminates wrap/echo mode
    swap   a,x                               ; Get the command back
    cmp    [PS2D_bMode], PS2D_CMD_MODE_WRAP_AROUND
    jnz    .dispatch_cmd

; Flow here if we are in wrap/echo mode.
    cmp    a,PS2_CMD_RESET_WRAP_MODE         ; Wrap Reset?
    jz     .dispatch_cmd                     ;   Simply let the dispatch routine do it.
    
    cmp    a,PS2_CMD_RESET                   ; Reset?
    jz     .dispatch_cmd                     ;   Simply let the dispatch routine do it.

; Flow here to wrap/echo the command
    call   PS2D_SendResponseByte
    jmp    .proc_cmd_exit                    ; Done 

; Jump here to dispatch a command

.dispatch_cmd:
	cmp    a, PS2_CMD_FIRST_CMD                 ; The command code against the lower limit
    jnc    .valid_cmd

    call   PS2D_CmdError                     ; Respond with a resend/error
    jmp    .proc_cmd_exit                    ; Done 

 ; Jump here for a valid command code
.valid_cmd:
; Index into the response table
; *  ACK if needed
; *  Dispatch to the command handler
    SUB    a, (PS2_CMD_FIRST_CMD)            ; Index into the ack dispatch table

    push   a                                 ; Save the index
    index  PS2D_CMD_RESPONSE                 ; Get the response
    cmp    a, PS2_CMD_NO_ACK                 ; Respond or not?
    jz     .no_rsp
    call   PS2D_SendResponseByte

.no_rsp:
    pop    a                                 ; Restore the index

    asl    a                                 ; Now it is a word offset for the JACC 
    call   .dispatch
    jmp    .ret_addr
.dispatch:
    jacc   PS2D_CMD_DISPATCH
.ret_addr:        
.proc_cmd_exit:
    mov    a, 0x01                           ; Signal a command was processed
    jmp    .exit

.no_cmd:
    mov    a, 0x00                           ; Signal no command was processed

.exit:
    pop    x                                 ; Restore X, return flag is in A
    ret
.ENDSECTION
;-----------------------------------------------------------------------------
;  FUNCTION NAME: PS2D_CmdError
;  DESCRIPTION:   Report a transmission error to the host
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:   None
;
;  RETURNS:     None
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;  This lets _SendResponseXXXX do the return to the call (saves stack and code)
;-----------------------------------------------------------------------------
 PS2D_CmdError:

; Mouse only
IF (PS2D_DEVICE_TYPE & PS2D_DEVICE_TYPE_MOUSE)
    inc    [PS2D_ErrorCnt]                        ; Tally the error
    cmp    [PS2D_ErrorCnt], 1                     ; First error?
    jz     .resend                                ; Ask for a resend

; Flow here on the second error
    mov    [PS2D_ErrorCnt], 0                     ; Restart the error counting
    ljmp   PS2D_SendResponseError                 ; Send and error
    
; Jump here on a resend
.resend:
ENDIF
    ljmp  PS2D_SendResponseResend                 ; Send a resend
;-----------------------------------------------------------------------------
;  FUNCTION NAME: PS2D_CmdReset
;  DESCRIPTION:   Reset the PS/2 Interface
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:   None
;
;  RETURNS:     None
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
PS2D_CmdReset:
    CALL    PS2D_BAT                   ; Do the BAT again
	RET
;-----------------------------------------------------------------------------
;  FUNCTION NAME: PS2D_CmdDisable
;  DESCRIPTION:   Disable Reporting
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:   None
;
;  RETURNS:     None
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
PS2D_CmdDisable:
    DISABLE_DEVICE                          ; Device specific disable actions
    mov     [PS2D_bIsEnabled], 0x00         ; Disable the interface
    call    PS2D_AbortTransfer              ; Abort the transfer

	ret
;-----------------------------------------------------------------------------
;  FUNCTION NAME: PS2D_CmdEnable
;  DESCRIPTION:   Enable reporting
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:   None
;
;  RETURNS:     None
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
PS2D_CmdEnable:
    mov		[PS2D_bIsEnabled], 0x01       ; Enable the interface
	ret
;-----------------------------------------------------------------------------
;  FUNCTION NAME: PS2D_CmdResend
;  DESCRIPTION:   Resend the current buffer.  Simply set the packet index to 0
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:   None
;
;  RETURNS:     None
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
PS2D_CmdResend:
    mov    [PS2D_bTxPktIndex], 0       ; Reset the index to zero
	ret
; End of File PS2D_cmd.asm