myusb.asm

实现2个ps/2接口转到1个USB接口功能

;-----------------------------------------------------------------------------
;  FUNCTION NAME: myUSB_bGetEPCount
;
;  DESCRIPTION:
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:
;
;  RETURNS:
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 myUSB_bGetEPCount:
_myUSB_bGetEPCount:
    CMP     A, (USB_MAX_EP_NUMBER + 1) ; Range check
    JNC     .invalid_ep                ; Bail out
; Flow here to get the endpoint count
    MOV     X, A                       ; Endpoint number is the index
    MOV     A, REG[X+EP0CNT]           ; Here is the count
    AND     A, 0x1F                    ; Mask off the count
    SUB     A, 2                       ; Ours includes the two byte checksum
    JMP     .exit                      ; Go to the common exit
; Jump here for an invalid endpoint
.invalid_ep:
    MOV     A, 0                       ; Return 0 for an invalid ep
; Jump or flow here for a common exit
.exit:
    RET
.ENDSECTION
;-----------------------------------------------------------------------------
;  FUNCTION NAME: myUSB_LoadEP
;
;  DESCRIPTION:    This function loads the specified endpoint buffer
;                  with the number of bytes previously set in the count
;                  register.
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:  A:X Pointer to the ram buffer containing the data to transfer
;              myUSB_APIEPNumber loaded with the endpoint number
;              myUSB_APICount loaded with the number of bytes to load
;
;  RETURNS:    NONE
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 myUSB_XLoadEP:
_myUSB_XLoadEP:
; extern void myUSB_LoadEP(BYTE, BYTE*);
    CMP     [myUSB_APIEPNumber], (USB_MAX_EP_NUMBER + 1) ; Range check
    JNC     .exit                      ; Bail out
; Flow here to get the endpoint count
    MOV     [myUSB_APITemp], X         ; Use this temp as the MVI pointer

    MOV     A, [myUSB_APIEPNumber]     ; Get the endpoint number
    INDEX   EPREGPTR                   ; Get the address of the endpoint data register array
    MOV     X, A                       ; We are going to use index access to the register array
    
    MOV     A, [myUSB_APICount]        ; Get the count
    MOV     [myUSB_APITemp+1], A       ; Use this temp as the count
; Copy loop
.loop:
    DEC     [myUSB_APITemp+1]          ; Are we done?
    JC      .done                      ; Jump if we are
    MVI     A, [myUSB_APITemp]         ; Get the data, inc the pointer
    MOV     REG[X + 0], A              ; Store the data
    INC     X                          ; Index the next data register
    JMP     .loop                      ; Copy the next byte or finish

; Jump here when the copy is finished
.done:
    MOV     X, [myUSB_APIEPNumber]     ; Get the endpoint number
    MOV     A, X
    INDEX   myUSB_USB_EP_BIT_LOOKUP
    AND     A, [myUSB_EPDataToggle]
    JZ      .addcount
    MOV     A, USB_CNT_TOGGLE

.addcount:     
    OR      A, [myUSB_APICount]        ; Get the count

    MOV     [X + myUSB_EndpointAPIStatus], NO_EVENT_PENDING ; Set the state
    MOV     REG[X + EP0CNT], A         ; Update the count register
    MOV     REG[X + EP0MODE], USB_MODE_ACK_IN ; Enable the endpoint
; Jump or flow here for a common exit
.exit:
    RET
.LITERAL
EPREGPTR:    DB    EP0DATA, EP1DATA, EP2DATA
.ENDLITERAL
.ENDSECTION
;-----------------------------------------------------------------------------
;  FUNCTION NAME: myUSB_EnableEP
;
;  DESCRIPTION:    This function enables an OUT endpoint.  It should not be
;                  called for an IN endpoint.
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:      A contains the endpoint number
;
;  RETURNS:        None
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 myUSB_EnableOutEP:
_myUSB_EnableOutEP:
 myUSB_EnableEP:
_myUSB_EnableEP:
    CMP     A, 0                       ; Can't enable EP0
    JZ      .exit                      ; Bail out
    CMP     A, (USB_MAX_EP_NUMBER + 1) ; Range check
    JNC     .exit                      ; Bail out
; Flow here to enable an endpoint        
    MOV     X, A                       ; Endpoint number is the index
    MOV     [X+myUSB_EndpointAPIStatus], NO_EVENT_PENDING ; For the API
    MOV     A, REG[X+EP0MODE]          ; Unlock the mode register
    MOV     REG[X+EP0MODE], USB_MODE_ACK_OUT ; Enable the endpoint
; Jump or flow here for a common exit
.exit:
    RET                                ; All done
.ENDSECTION
;-----------------------------------------------------------------------------
;  FUNCTION NAME: myUSB_DisableEP
;
;  DESCRIPTION:    This function disables an OUT endpoint.  It should not be
;                  called for an IN endpoint.
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:
;
;  RETURNS:
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 myUSB_DisableOutEP:
_myUSB_DisableOutEP:
 myUSB_DisableEP:
_myUSB_DisableEP:
    CMP     A, 0                       ; Can't disable EP0
    JZ      .exit                      ; Bail out
    CMP     A, (USB_MAX_EP_NUMBER + 1) ; Range check
    JNC     .exit                      ; Bail out
; Flow here to disable an endpoint        
    MOV     X, A                       ; Endpoint number is the index
    MOV     A, REG[X+EP0MODE]          ; Unlock the mode register
    MOV     REG[X+EP0MODE], USB_MODE_NAK_OUT ; Disable the endpoint
; Jump or flow here for a common exit
.exit:
    RET                                ; All done
.ENDSECTION
;-----------------------------------------------------------------------------
;  FUNCTION NAME: myUSB_Force
;
;  DESCRIPTION:    Force the J/K/SE0 State of D+/D-
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:     A: USB_FORCE_J
;                    USB_FORCE_K
;                    USB_FORCE_SE0
;                    USB_FORCE_NONE
;
;  RETURNS:       Nothing
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 myUSB_Force:
_myUSB_Force:
    CMP    A, USB_FORCE_NONE           ; Are we done forcing D+/D-?
    JZ     .none                       ; Jump if we are done
; Flow here to start checking 
    CMP    A, USB_FORCE_J              ; Force J?
    JNZ    .check_k                    ; Jump if not J
; Flow here to force J
    OR     [Port_1_Data_SHADE], 0x02   ; D- = 1
    AND    [Port_1_Data_SHADE], ~(0x01); D+ = 0
    JMP    .force                      ; Go set the force register
; Jump here to check Force K
.check_k:
    CMP    A, USB_FORCE_K              ; Force K?
    JNZ    .check_se0                  ; Jump if not K
; Flow here to force K
    OR     [Port_1_Data_SHADE], 0x01   ; D+ = 1
    AND    [Port_1_Data_SHADE], ~(0x02); D- = 0
    JMP    .force                      ; Go set the force register
; Jump here to check Force SE0
.check_se0:
    CMP    A, USB_FORCE_SE0            ; Force SE0?
    JZ     .invalid                    ; Jump if not SE0
; Flow here to force SE0
    AND    [Port_1_Data_SHADE], ~(0x03); D- = 0,  D+ = 0
; Jump or flow here to enable forcing (Port bits are set in the shadow register)
.force:
    MOV    A, [Port_1_Data_SHADE]      ; Get the shadow
    MOV    REG[P1DATA], A              ; Update the port
    OR     REG[USBXCR], USB_FORCE_STATE; Enable FORCING D+/D-
    RET                                ; Exit
; Jump here to clear forcing
.none:
    AND    REG[USBXCR], ~(USB_FORCE_STATE) ; Disable FORCING D+/D-
; Jump or flow here to exit on end forcing or an invalid parameter
.invalid:
    RET                                ; Exit
.ENDSECTION
;-----------------------------------------------------------------------------
;  FUNCTION NAME: myUSB_Suspend
;
;  DESCRIPTION:    Puts the USB Transceiver into power-down mode, while
;                  maintaining the USB address assigned by the USB host. 
;                  To restore the USB Transceiver to normal operation, the
;                  myUSB_Resume function should be called.
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:     None
;
;  RETURNS:       Nothing
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 myUSB_Suspend:
_myUSB_Suspend:
    AND     REG[myUSB_ADDR], ~(USB_ADDR_ENABLE) ; Disable transceiver
    RET                                ; Exit
.ENDSECTION
;-----------------------------------------------------------------------------
;  FUNCTION NAME: myUSB_Resume
;
;  DESCRIPTION:    Puts the USB Transceiver into normal operation, following
;                  a call to USB_Suspend. It retains the USB address that had
;                  been assigned by the USB host.
;
;-----------------------------------------------------------------------------
;
;  ARGUMENTS:     None
;
;  RETURNS:       Nothing
;
;  SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
;  THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
.SECTION
 myUSB_Resume:
_myUSB_Resume:
    OR     REG[myUSB_ADDR], (USB_ADDR_ENABLE) ; Enable transceiver
    RET                                ; Exit
.ENDSECTION


;-----------------------------------------------
; Add custom application code for routines 
;-----------------------------------------------

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; End of File myUSB.asm