📄 usb_drv.lis
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0012 USB_TransferSize:
0012 _USB_TransferSize: BLK 2
0014 ;----------------------------------------------------------------------------
0014 ; Control Transfer Data Pointer
0014 ; Source for Control Read
0014 ; Destination for Control Write
0014 ;----------------------------------------------------------------------------
EXPORT USB_DataPtr, _USB_DataPtr
0014 USB_DataPtr:
0014 _USB_DataPtr: BLK 2
0016 ;----------------------------------------------------------------------------
0016 ; Transfer Completion Notification
0016 ;----------------------------------------------------------------------------
EXPORT USB_StatusBlockPtr, _USB_StatusBlockPtr
0016 USB_StatusBlockPtr:
0016 _USB_StatusBlockPtr: BLK 2
0018 ;----------------------------------------------------------------------------
0018 ; Control Transfer _TransferByteCount (Actually transfered)
0018 ;----------------------------------------------------------------------------
0018 USB_TransferByteCount: BLK 2
001A ;----------------------------------------------------------------------------
001A ; Control Endpoint Data toggle
EXPORT USB_EPDataToggle
001A USB_EPDataToggle:
001A USB_EP0DataToggle: BLK 1
001B ;----------------------------------------------------------------------------
001B ; Control Endpoint Data Pending Flag
EXPORT USB_fDataPending
001B USB_fDataPending: BLK 1
001C ;----------------------------------------------------------------------------
001C ; Control Endpoint Data Pending Flag
001C ;EXPORT USB_PendingData
001C ; USB_PendingData: BLK 1
001C ;----------------------------------------------------------------------------
001C ; Temporary Data registers
EXPORT USB_t2, USB_t1, USB_t0
001C USB_t2: BLK 1 ; Temporary shared by the UM
001D USB_t1: BLK 1 ; Temporary shared by the UM
001E USB_t0: BLK 1 ; Temporary shared by the UM
001F ;----------------------------------------------------------------------------
001F ; Endpoint Transfer--API Status
001F ;----------------------------------------------------------------------------
EXPORT USB_EndpointAPIStatus, _USB_EndpointAPIStatus
001F USB_EndpointAPIStatus:
001F _USB_EndpointAPIStatus: BLK USB_NUM_ENDPOINTS ; Endpoint Status
0022
AREA UserModules (ROM, REL)
;-----------------------------------------------------------------------------
; FUNCTION NAME: USB_EP0_ISR
;
; DESCRIPTION: The EPO ISR serves the control endpoint interrupts and
; dispaches all SETUP, IN, and OUT transfers to the proper
; dispatch routines for all supported USB requests.
;
;-----------------------------------------------------------------------------
;
; ARGUMENTS: n/a
;
; RETURNS: n/a
;
; SIDE EFFECTS: REGISTERS ARE VOLATILE: THE A AND X REGISTERS MAY BE MODIFIED!
;
; THEORY of OPERATION or PROCEDURE:
;
;-----------------------------------------------------------------------------
0000 USB_EP0_ISR:
0000 _USB_EP0_ISR:
0000 08 PUSH A ; Save the context
0001 10 PUSH X ;
0002 ; Dispatch to setup/in/out handlers
EXPORT USB_mode_read
0002 USB_mode_read:
0002 5D44 MOV A, REG[USB_EP0MODE] ; Get the mode reg
0004
0004 ; MSB is the SETUP bit, followed by IN, then OUT
0004 64 asl a ; Shift to the carry and jump if SETUP bit set
0005 C011 jc USB_EP0_Setup
0007
0007 64 asl a ; Shift to the carry and jump if IN bit set
0008 C02E jc USB_EP0_IN
000A
000A 64 asl a ; Shift to the carry and jump if OUT bit set
000B C037 jc USB_EP0_OUT
000D 8258 JMP USB_Not_Supported_Local_Drv
000F ; ISR Exit Point to update the mode register
000F ; mode and count have been pushed onto the stack
EXPORT USB_EP0_UPD_MODE_EXIT
000F USB_EP0_UPD_MODE_EXIT:
000F
000F 6041 MOV REG[USB_EP0CNT], A ; Update the count
0011 5B MOV A, X ; Get the new mode
0012 6044 MOV REG[USB_EP0MODE], A ; Update the node
0014
0014 USB_EP0_ISR_EXIT:
0014
0014 20 POP X ;
0015 18 POP A ; Restore Context
0016 7E RETI
0017 ;-----------------------------------------------------------------------------
0017 ; FUNCTION NAME: USB_EP0_Setup
0017 ;
0017 ; DESCRIPTION: Dispatch a USB SETUP
0017 ;
0017 ;-----------------------------------------------------------------------------
0017 USB_EP0_Setup:
0017 _USB_EP0_Setup:
0017 ; Check the byte count and validity. All SETUP are 8 bytes and 0 toggle
0017 08 PUSH A ; Save the mode register
0018 5002 MOV A, USB_XFER_PREMATURE ; Return a Premature Completion?
001A 91DA CALL USB_UpdateStatusBlock
001C 18 POP A ; Restore the mode register
001D 5D41 MOV A, REG[USB_EP0CNT] ; Get the count reg
001F 394A CMP A, (USB_CNT_VALID | 0x0A)
0021 A003 JZ .dispatch
0023
0023 8242 JMP USB_Not_Supported_Local_Drv
0025 ;-----------------------------------------------------------------------------
0025 ; Jump here to dispatch the request
0025 ; The SETUP request is encoded in [bmRequestType]. Among the 8 bits in [bmRequestType], only bits
0025 ; 7,6,5,1,0 determine what the request is. Bits [2:4] are default to zero. The below code
0025 ; re-organizes [bmRequestType] to the following format:
0025 ; ( Zero, Zero, Bit7, Bit6, Bit5, Bit1, Bit0, Zero ), and depending on the value of this
0025 ; "re-organization", the firmware will jump to an appropriate table to handle the request.
0025 ;-----------------------------------------------------------------------------
0025 .dispatch:
0025 5D50 MOV A, REG[USB_EP0DATA+bmRequestType] ; Get bmRequestType
0027 21E3 AND A, E3h ; clear bits 4-3-2, these unused for our purposes
0029 08 PUSH A ; store value on the stack
002A 67 ASR A ; move bits 7-6-5 into 4-3-2's place
002B 67 ASR A ; "asr" instruction shift all bits one place to the right.
002C 67 ASR A ; Bit7 remains the same.
002D 531C MOV [USB_t2], A ; store shifted value
002F 18 POP A ; get original value
0030 2A1C OR A, [USB_t2] ; or the two to get the 5-bit field
0032 211F AND A, 1Fh ; clear bits 7-6-5 (asr wraps bit7)
0034 ; Bit0 is loaded with a Zero. This results in multiplying
0034 ; the accumulator by 2, and the reason to mutiply it by 2
0034 ; is that each "jmp" instruction in the tables is two bytes long.
0034
0034 7D025D LJMP USB_bmRequestType_Dispatch
0037 ;-----------------------------------------------------------------------------
0037 ; FUNCTION NAME: USB_EP0_IN
0037 ;
0037 ; DESCRIPTION: Dispatch a USB IN
0037 ;
0037 ;-----------------------------------------------------------------------------
0037 USB_EP0_IN:
0037 _USB_EP0_IN:
0037
0037 5108 MOV A, [USB_TransferType]
0039 USB_ControlInDispatch:
0039 E001 JACC USB_ControlInDispatchTable
003B USB_ControlInDispatchTable:
003B 822A JMP USB_Not_Supported_Local_Drv ; USB_TRANS_STATE_IDLE
003D 8037 JMP USB_ControlReadDataStage ; USB_TRANS_STATE_CONTROL_READ
003F 80AD JMP USB_ControlWriteStatusStage ; USB_TRANS_STATE_CONTROL_WRITE
0041 80B8 JMP USB_NoDataControlStatusStage ; USB_TRANS_STATE_NO_DATA_CONTROL
0043 ;-----------------------------------------------------------------------------
0043 ; FUNCTION NAME: USB_EP0_OUT
0043 ;
0043 ; DESCRIPTION: Dispatch a USB OUT
0043 ;
0043 ;-----------------------------------------------------------------------------
0043 USB_EP0_OUT:
0043 _USB_EP0_OUT:
0043 5108 MOV A, [USB_TransferType]
0045 E001 JACC USB_ControlOutDispatchTable
0047 USB_ControlOutDispatchTable:
0047 821E JMP USB_Not_Supported_Local_Drv ; USB_TRANS_STATE_IDLE
0049 802D JMP USB_ControlReadStatusStage ; USB_TRANS_STATE_CONTROL_READ
004B 805E JMP USB_ControlWriteDataStage ; USB_TRANS_STATE_CONTROL_WRITE
004D 80C6 JMP USB_NoDataControlError ; USB_TRANS_STATE_NO_DATA_CONTROL
004F ;-----------------------------------------------------------------------------
004F ; FUNCTION NAME: USB_InitControlRead
004F ;
004F ; DESCRIPTION: This routine initializes a control read. It must be JUMPed to,
004F ; not called. It assumes a tranfer descriptor has been loaded
004F ; into the driver USB_CurrentTD data structure.
004F ;
004F ;-----------------------------------------------------------------------------
004F USB_InitControlRead:
004F 5307 MOV [USB_LastSize], A ; Save the packet size?
0051 91B9 CALL USB_InitializeStatusBlock
0053 550802 MOV [USB_TransferType], USB_TRANS_STATE_CONTROL_READ
0056
0056 ; Check the transfer size against the request size
0056 5D57 MOV A, REG[USB_EP0DATA+wLengthHi] ; MSB of wLength
0058 3A12 CMP A, [USB_TransferSize]
005A B007 JNZ .L1
005C
005C 5D56 MOV A, REG[USB_EP0DATA+wLengthLo] ; LSB of wLength
005E 3A13 CMP A, [USB_TransferSize+1]
0060 A009 JZ .L9
0062 .L1:
0062 D007 JNC .L9
0064 ;
0064 5313 MOV [USB_TransferSize+1], A ;
0066 5D57 MOV A, REG[USB_EP0DATA+wLengthHi] ;
0068 5312 MOV [USB_TransferSize], A ;
006A .L9:
006A 551800 MOV [USB_TransferByteCount], 0 ;
006D 551900 MOV [USB_TransferByteCount+1], 0;
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