01C6            ;Stall unsupported requests.
01C6            ;        jmp SendStall
01C6            
01C6            ;Host to device with endpoint as recipient
01C6            RequestType02:
01C6 1A 71 [06]      mov A, [bRequest]     ; load bRequest
01C8            
01C8            ; The only standard feature defined for an endpoint is endpoint_stalled.
01C8            ; Clear Feature               bRequest = 1
01C8 16 01 [04]      cmp A, clear_feature
01CA A2 7E [05]      jz ClearEndpointStall
01CC            ; Set Feature               bRequest = 3
01CC 16 03 [04]      cmp A, set_feature
01CE A2 97 [05]      jz SetEndpointStall
01D0             
01D0            ;Stall unsupported functions.
01D0 81 AD [05]     jmp SendStall
01D2            
01D2            ;Device to host with device as recipient
01D2            RequestType80:
01D2 1A 71 [06]      mov A, [bRequest]          ; load bRequest
01D4            
01D4            ; Get Status               bRequest = 0
01D4 16 00 [04]      cmp A, get_status
01D6 A2 A8 [05]      jz GetDeviceStatus
01D8            
01D8            ; Get Descriptor               bRequest = 6
01D8 16 06 [04]      cmp A, get_descriptor
01DA A2 B2 [05]      jz GetDescriptor
01DC            
01DC            ; Get Configuration          bRequest = 8
01DC 16 08 [04]      cmp A, get_configuration
01DE A2 CA [05]      jz GetConfiguration
01E0            
01E0            ;Stall unsupported requests.
01E0 81 AD [05]      jmp SendStall
01E2            
01E2            ;Device to host with interface as recipient
01E2            RequestType81:
01E2 1A 71 [06]      mov A, [bRequest]     ; load bRequest
01E4            
01E4            ; Get Status               bRequest = 0
01E4 16 00 [04]       cmp A, get_status
01E6 A2 D4 [05]       jz GetInterfaceStatus
01E8            
01E8            ; Get Interface returns the selected alternate setting.
01E8            ;  This firmware supports no alternate settings.
01E8            ; Get Interface                 bRequest = 10   *** not supported ***
01E8            
01E8            ;The HID class defines one more request for bmRequestType=10000001
01E8            ; Get Descriptor                bRequest = 6
01E8 16 06 [04]       cmp A, get_descriptor
01EA A2 B2 [05]       jz GetDescriptor
01EC            
01EC            ;Stall unsupported functions
01EC 81 AD [05]       jmp SendStall
01EE            
01EE            ;Device to host with endpoint as recipient
01EE            RequestType82:
01EE 1A 71 [06]      mov A, [bRequest]          ; load bRequest
01F0            ; Get Status               bRequest = 0
01F0 16 00 [04]      cmp A, get_status
01F2 A2 DC [05]       jz GetEndpointStatus
01F4            
01F4            ; Get Descriptor               bRequest = 6
01F4 16 06 [04]      cmp A, get_descriptor
01F6 A2 B2 [05]      jz GetDescriptor
01F8            ; Sync Frame                  bRequest = 12   *** not supported ***
01F8            
01F8            ;Stall unsupported functions.
01F8 81 AD [05]      jmp SendStall
01FA            
01FA            
01FA            ;Check for HID class requests
01FA            
01FA            ;Host to device with endpoint as recipient
01FA            RequestType21:
01FA 1A 71 [06]       mov A, [bRequest]      ; load bRequest
01FC            
01FC            ; Set Report               bRequest = 9
01FC 16 09 [04]      cmp A, set_report
01FE 20    [04]         NOP
01FF 1F    [04]         XPAGE
0200 A2 E7 [05]      jz SetReport
0202            
0202            ; Set Idle                    bRequest = 10
0202 16 0A [04]       cmp A, set_idle
0204 A2 FA [05]       jz SetIdle
0206            
0206            ; Set Protocol               bRequest = 11
0206 16 0B [04]       cmp A, set_protocol
0208 A2 FC [05]       jz SetProtocol
020A            
020A            ;Stall unsupported requests
020A 81 AD [05]      jmp SendStall
020C            
020C            RequestType22:
020C 1A 71 [06]         mov A, [bRequest]      ; load bRequest
020E            
020E            ; Set Report               bRequest = 9
020E 16 09 [04]      cmp A, set_report     
0210 A2 E7 [05]      jz SetReport
0212            
0212            ;Stall unsupported requests
0212 81 AD [05]      jmp SendStall
0214            
0214            
0214            ;Device to host with endpoint as recipient
0214            RequestTypeA1:
0214 1A 71 [06]         mov A, [bRequest]      ; load bRequest
0216            
0216            ; Get Report               bRequest = 1
0216 16 01 [04]         cmp A, get_report
0218 A3 05 [05]         jz GetReport
021A            
021A            ; Get Idle                 bRequest = 2
021A 16 02 [04]         cmp A, get_idle
021C A3 10 [05]         jz GetIdle
021E            
021E            ; Get Protocol             bRequest = 3
021E 16 03 [04]         cmp A, get_protocol
0220 A3 12 [05]         jz GetProtocol
0222            
0222            ;Stall unsupported requests
0222 81 AD [05]         jmp SendStall
0224            
0224            ;----------------------------------------------------------------------
0224            ;Control transfer, stage three
0224            ;Process the request.
0224            ;----------------------------------------------------------------------
0224            
0224            ;The host controls whether or not a device can request a remote wakeup.
0224            
0224            ; Disable the remote wakeup capability.
0224            ClearRemoteWakeup:
0224 1A 72 [06]         mov A, [wValue]
0226 16 01 [04]         cmp A, device_remote_wakeup
0228 B1 AD [05]         jnz SendStall
022A            ;Handshake by sending a data packet
022A 93 79 [10]         call Send0ByteDataPacket
022C 19 00 [04]         mov A, DISABLE_REMOTE_WAKEUP
022E 31 30 [05]         mov [remote_wakeup_status], A
0230 3F    [08]         ret
0231            
0231            ; Enable the remote wakeup capability.
0231            SetRemoteWakeup:
0231 1A 72 [06]         mov A, [wValue]
0233 16 01 [04]         cmp A, device_remote_wakeup
0235            ;If not a match, stall.
0235 B1 AD [05]         jnz SendStall
0237            ;Handshake by sending a 0-byte data packet
0237 93 79 [10]         call Send0ByteDataPacket
0239            ;Perform the request.
0239 19 02 [04]         mov A, ENABLE_REMOTE_WAKEUP
023B 31 30 [05]         mov [remote_wakeup_status], A
023D 3F    [08]         ret
023E            
023E            SetAddress:
023E            ; Set the device address to match wValue in the Setup packet.
023E            ;Complete the requested action after completing the transaction.
023E            ;Handshake by sending a 0-byte data packet.
023E 93 79 [10]         call Send0ByteDataPacket
0240            ;Perform the request
0240 1A 72 [06]         mov A, [wValue]
0242 2A 12 [05]         iowr USB_Device_Address
0244 3F    [08]         ret
0245            
0245            SetConfiguration:
0245            ;Unconfigured: wValue=0, configured: wValue=1.
0245            ;Also clear any stall condition and set Data 0/1 to Data0.
0245            ;Handshake by sending a 0-byte data packet.
0245 93 79 [10]       call Send0ByteDataPacket
0247            ;Save the configuration status.
0247 1A 72 [06]       mov A, [wValue]
0249 31 31 [05]       mov [configuration_status], A
024B            ;Clear any stall condtion
024B 19 00 [04]       mov A, 0
024D 31 29 [05]       mov [endpoint_stall], A
024F            ;Set data 0/1 to Data0
024F 29 11 [05]       iord USB_EP1_TX_Config
0251 10 BF [04]       and A, ~DataToggle
0253            
0253            ;Set the configuration status.
0253 2A 11 [05]      iowr USB_EP1_TX_Config     
0255 1A 31 [06]      mov A, [configuration_status]
0257 16 00 [04]      cmp A, 0
0259            ;If configured, jump.
0259 B2 69 [05]      jnz device_configured
025B            
025B            ;If unconfigured:
025B            ;Disable Endpoint 1
025B 29 11 [05]      iord USB_EP1_TX_Config
025D 10 EF [04]      and A, EFh
025F 2A 11 [05]      iowr USB_EP1_TX_Config
0261            ;Disable Endpoint 1 interrupts.
0261 1A 20 [06]      mov A, [interrupt_mask]
0263 10 EF [04]      and A, EFh
0265 31 20 [05]           mov [interrupt_mask], A
0267 82 7D [05]      jmp done_configuration
0269            
0269            ;If configured:
0269            device_configured:
0269            ;Send NAK in response to IN packets
0269 29 11 [05]      iord USB_EP1_TX_Config
026B 10 7F [04]      and A,7Fh
026D            ;Enable Endpoint 1
026D 0D 10 [04]      or A, 10h
026F 2A 11 [05]      iowr USB_EP1_TX_Config
0271            ;Enable interrupts: Endpoint 1 and GPIO
0271 1A 20 [06]      mov A, [interrupt_mask]
0273 0D 50 [04]      or A, 50h
0275 31 20 [05]      mov [interrupt_mask], A
0277            ;Send NAK in response to Endpoint 0 OUT packets.
0277 29 13 [05]      iord USB_Status_Control
0279 10 EF [04]      and A,0EFh
027B 2A 13 [05]      iowr USB_Status_Control
027D            done_configuration:
027D 3F    [08]         ret
027E            
027E            ClearEndpointStall:
027E            ;Clear the stall condition for an endpoint.
027E            ;For endpoint 1, also set Data 0/1 to Data 0.
027E 1A 72 [06]         mov A, [wValue]
0280 16 00 [04]         cmp A, endpoint_stalled
0282 B1 AD [05]         jnz SendStall
0284            ;
0284            ;Clear Endpoint 1 stall
0284            ;Handshake by sending a 0-byte data packet
0284 93 79 [10]       call Send0ByteDataPacket
0286            ;Clear the stall condition
0286 19 00 [04]       mov A,0
0288 31 29 [05]       mov [endpoint_stall], A
028A            ;Set Data 0/1 to Data0
028A 29 11 [05]       iord USB_EP1_TX_Config
028C 10 BF [04]       and A, ~DataToggle
028E 2A 11 [05]       iowr USB_EP1_TX_Config
0290            ;Send NAK in response to Endpoint 0 OUT packets.
0290 29 13 [05]       iord USB_Status_Control
0292 10 EF [04]       and A,0EFh
0294 2A 13 [05]       iowr USB_Status_Control
0296 3F    [08]       ret
0297            
0297            ;Stall Endpoint 1
0297            SetEndpointStall:
0297 1A 72 [06]         mov A, [wValue]
0299 16 00 [04]         cmp A, endpoint_stalled
029B            ;Not a match, so stall
029B B1 AD [05]         jnz SendStall
029D            ;Handshake by sending a 0-byte data packet.
029D 93 79 [10]         call Send0ByteDataPacket
029F            ;Stall the endpoint.
029F 19 01 [04]         mov A,1         
02A1 31 29 [05]         mov [endpoint_stall], A
02A3 19 30 [04]         mov A, 30h
02A5 2A 11 [05]         iowr USB_EP1_TX_Config                 
02A7 3F    [08]         ret
02A8            
02A8            GetDeviceStatus:
02A8            ;Device Status is two bytes.
02A8            ;Bit 0 must be 0 (bus-powered).
02A8            ;Bit 1 is remote wakeup: 0=disabled, 1=enabled.
02A8            ;All other bits are unused.
02A8            ;Send two bytes.
02A8 19 02 [04]         mov A, 2
02AA 31 28 [05]         mov [data_count], A
02AC            ;The control_read_table holds the two possible values for device status.
02AC            ;Get the address of the first value.
02AC 19 9C [04]         mov A, (get_dev_status_table - control_read_table)
02AE            ;Add an index value to select the correct bytes.
02AE 02 30 [06]         add A, [remote_wakeup_status]
02B0            ;Send the value.
02B0 83 3E [05]         jmp SendDescriptor
02B2            
02B2            GetDescriptor:
02B2            ;The high byte of wValue contains the descriptor type.