📄 logo.asm
字号:
mov A, EP0_INT ; turn off endpoint 1 interrupts
iowr endpoint_int
jmp set_device_configuration_done
configure_device: ; set device as configured
mov [configuration], A
mov A, [ep1_stall] ; if endpoint 1 is stalled
and A, FFh
jz ep1_nak_in_out
mov A, STALL_IN_OUT ; set endpoint 1 mode to stall
iowr ep1_mode
jmp ep1_set_int
ep1_nak_in_out:
mov A, NAK_IN_OUT ; otherwise set it to NAK in/out
iowr ep1_mode
ep1_set_int:
mov A, EP0_INT | EP1_INT ; enable endpoint 1 interrupts
iowr endpoint_int
mov A, 00h
mov [ep1_data_toggle], A ; reset the data toggle
mov [ep1_dmabuff0], A ; reset endpoint 1 fifo values
mov [ep1_dmabuff1], A
mov [ep1_dmabuff2], A
set_device_configuration_done:
mov A, NO_CHANGE_PENDING
mov [ep0_in_flag], A
jmp initialize_no_data_control
get_device_status: ; GET STATUS
mov A, DEVICE_STATUS_LENGTH
mov [maximum_data_count], A
mov A, (device_status_wakeup_disabled - control_read_table)
mov [data_start], A
jmp initialize_control_read
get_device_descriptor: ; GET DESCRIPTOR
mov A, [wValuehi]
asl A
jacc get_device_descriptor_jumptable
send_device_descriptor:
mov A, 00h ; get device descriptor length
index device_desc_table
mov [maximum_data_count], A
mov A, (device_desc_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
send_configuration_descriptor:
mov A, 02h
index config_desc_table:
mov [maximum_data_count], A
mov A, (config_desc_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
send_string_descriptor:
mov A, [wValuelo]
asl A
jacc string_jumptable:
language_string:
mov A, 00h
index ilanguage_string
mov [maximum_data_count], A
mov A, (ilanguage_string - control_read_table)
mov [data_start], A
jmp initialize_control_read
manufacturer_string:
mov A, 00h
index imanufacturer_string
mov [maximum_data_count], A
mov A, (imanufacturer_string - control_read_table)
mov [data_start], A
jmp initialize_control_read
product_string:
mov A, 00h
index iproduct_string
mov [maximum_data_count], A
mov A, (iproduct_string - control_read_table)
mov [data_start], A
jmp initialize_control_read
serial_string:
mov A, 00h
index iserialnumber_string
mov [maximum_data_count], A
mov A, (iserialnumber_string - control_read_table)
mov [data_start], A
jmp initialize_control_read
configuration_string:
mov A, 00h
index iconfiguration_string
mov [maximum_data_count], A
mov A, (iconfiguration_string - control_read_table)
mov [data_start], A
jmp initialize_control_read
send_interface_descriptor:
mov A, 00h ; get interface descriptor length
index interface_desc_table
mov [maximum_data_count], A
mov A, (interface_desc_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
send_endpoint_descriptor:
mov A, 00h ; get endpoint descriptor length
index endpoint_desc_table
mov [maximum_data_count], A
mov A, (endpoint_desc_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
get_device_configuration: ; GET CONFIGURATION
mov A, DEVICE_CONFIG_LENGTH
mov [maximum_data_count], A
mov A, [configuration] ; test configuration status
and A, FFh
jz device_unconfigured
device_configured: ; send configured status
mov A, (device_configured_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
device_unconfigured: ; send unconfigured status
mov A, (device_unconfigured_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
;;************ INTERFACE REQUESTS ***********
set_interface_interface: ; SET INTERFACE
mov A, [wValuelo]
cmp A, 00h ; there are no alternate interfaces
jz alternate_supported ; for this device
alternate_not_supported: ; if the host requests any other
jmp request_not_supported ; alternate than 0, stall.
alternate_supported:
mov A, NO_CHANGE_PENDING
mov [ep0_in_flag], A
jmp initialize_no_data_control
get_interface_status: ; GET STATUS
mov A, INTERFACE_STATUS_LENGTH
mov [maximum_data_count], A
mov A, (interface_status_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
get_interface_interface: ; GET INTERFACE
mov A, INTERFACE_ALTERNATE_LENGTH
mov [maximum_data_count], A
mov A, (interface_alternate_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
set_interface_idle: ; SET IDLE
mov A, [wValuehi] ; test if new idle time
cmp A, 00h ; disables idle timer
jz idle_timer_disable
mov A, [idle_timer] ; test if less than 4ms left
cmp A, 01h
jz set_idle_last_not_expired
mov A, [wValuehi] ; test if time left less than
sub A, [idle_timer] ; new idle value
jnc set_idle_new_timer_less
jmp set_idle_normal
idle_timer_disable:
mov [idle], A ; disable idle timer
jmp set_idle_done
set_idle_last_not_expired:
mov A, EVENT_PENDING ; send report immediately
mov [event_machine], A
mov A, 00h ; reset idle prescaler
mov [idle_prescaler], A
mov A, [wValuehi] ; set new idle value
mov [idle_timer], A
mov [idle], A
jmp set_idle_done
set_idle_new_timer_less:
mov A, 00h
mov [idle_prescaler], A ; reset idle prescaler
mov A, [wValuehi]
mov [idle_timer], A ; update idle time value
mov [idle], A
jmp set_idle_done
set_idle_normal:
mov A, 00h ; reset idle prescaler
mov [idle_prescaler], A
mov A, [wValuehi] ; update idle time value
mov [idle_timer], A
mov [idle], A
set_idle_done:
mov A, NO_CHANGE_PENDING ; respond with no-data control
mov [ep0_in_flag], A ; transaction
jmp initialize_no_data_control
set_interface_protocol: ; SET PROTOCOL
mov A, [wValuelo]
mov [protocol], A ; set protocol value
mov A, NO_CHANGE_PENDING
mov [ep0_in_flag], A ; respond with no-data control
jmp initialize_no_data_control ; transaction
get_interface_report: ; GET REPORT
mov A, DATA_TOGGLE ; set data toggle to DATA ONE
mov [ep0_data_toggle], A
mov A, NAK_IN_OUT ; clear setup bit to write to
iowr ep0_mode ; endpoint fifo
mov A, [ep1_dmabuff0] ; copy over button data
mov [ep0_dmabuff0], A
mov A, [ep1_dmabuff1] ; copy horizontal data
mov [ep0_dmabuff1], A
mov A, [ep1_dmabuff2] ; copy vertical data
mov [ep0_dmabuff2], A
mov A, CONTROL_READ_DATA ; set state machine state
mov [ep0_in_machine], A
mov X, 03h ; set number of byte to transfer to 3
jmp dmabuffer_load_done ; jump to finish transfer
get_interface_idle: ; GET IDLE
mov A, DATA_TOGGLE ; set data toggle to DATA ONE
mov [ep0_data_toggle], A
mov A, NAK_IN_OUT ; clear setup bit to write to
iowr ep0_mode ; endpoint fifo
mov A, [idle] ; copy over idle time
mov [ep0_dmabuff0], A
mov A, CONTROL_READ_DATA ; set state machine state
mov [ep0_in_machine], A
mov X, 01h ; set number of byte to transfer to 3
jmp dmabuffer_load_done ; jump to finish transfer
get_interface_protocol: ; GET PROTOCOL
mov A, INTERFACE_PROTOCOL_LENGTH
mov [maximum_data_count], A ; get offset of device descriptor table
mov A, [protocol]
and A, 01h
jz boot_protocol
report_protocol:
mov A, (interface_report_protocol - control_read_table)
mov [data_start], A
jmp initialize_control_read ; get ready to send data
boot_protocol:
mov A, (interface_boot_protocol - control_read_table)
mov [data_start], A
jmp initialize_control_read ; get ready to send data
get_interface_hid:
mov A, [wValuehi]
cmp A, 21h
jz get_interface_hid_descriptor
cmp A, 22h
jz get_interface_hid_report
jmp request_not_supported
get_interface_hid_descriptor: ; GET HID CLASS DESCRIPTOR
mov A, 00h ; get hid decriptor length
index hid_desc_table
mov [maximum_data_count], A ; get offset of device descriptor table
mov A, (hid_desc_table - control_read_table)
mov [data_start], A
jmp initialize_control_read ; get ready to send data
get_interface_hid_report: ; GET HID REPORT DESCRIPTOR
mov A, 07h ; get hid report descriptor length
index hid_desc_table
mov [maximum_data_count], A ; get offset of device descriptor table
mov A, (hid_report_desc_table - control_read_table)
mov [data_start], A
jmp initialize_control_read ; get ready to send data
;;************ ENDPOINT REQUESTS ************
clear_endpoint_feature: ; CLEAR FEATURE
mov A, [wValuelo]
cmp A, ENDPOINT_STALL
jnz request_not_supported
mov A, 00h ; clear endpoint 1 stall
mov [ep1_stall], A
mov A, NO_CHANGE_PENDING ; respond with no-data control
mov [ep0_in_flag], A
jmp initialize_no_data_control
set_endpoint_feature: ; SET FEATURE
mov A, [wValuelo]
cmp A, ENDPOINT_STALL
jnz request_not_supported
mov A, FFh ; stall endpoint 1
mov [ep1_stall], A
mov A, NO_CHANGE_PENDING ; respond with no-data control
mov [ep0_in_flag], A
jmp initialize_no_data_control
get_endpoint_status: ; GET STATUS
mov A, ENDPOINT_STALL_LENGTH
mov [maximum_data_count], A
mov A, [ep1_stall] ; test if endpoint 1 stalled
and A, FFh
jnz endpoint_stalled
endpoint_not_stalled: ; send no-stall status
mov A, (endpoint_nostall_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
endpoint_stalled: ; send stall status
mov A, (endpoint_stall_table - control_read_table)
mov [data_start], A
jmp initialize_control_read
;;***************** CONTROL READ TRANSACTION **************
initialize_control_read:
mov A, TRANS_CONTROL_READ ; set transaction type to control read
mov [ep0_transtype], A
mov A, DATA_TOGGLE ; set data toggle to DATA ONE
mov [ep0_data_toggle], A
; if wLengthhi == 0
mov A, [wLengthhi] ; find lesser of requested and maximum
cmp A, 00h
jnz initialize_control_read_done
; and wLengthlo < maximum_data_count
mov A, [wLengthlo] ; find lesser of requested and maximum
cmp A, [maximum_data_count] ; response lengths
jnc initialize_control_read_done
; then maximum_data_count >= wLengthlo
mov A, [wLengthlo]
mov [maximum_data_count], A
initialize_control_read_done:
jmp control_read_data_stage ; send first packet
;;***************** CONTROL WRITE TRANSACTION *************
initialize_control_write:
mov A, TRANS_CONTROL_WRITE ; set transaction type to control write
mov [ep0_transtype], A
mov A, DATA_TOGGLE ; set accepted data toggle
mov [ep0_data_toggle], A
mov A, ACK_OUT_NAK_IN ; set mode
iowr ep0_mode
pop A
pop X
reti
;;***************** NO DATA CONTROL TRANSACTION ***********
initialize_no_data_control:
mov A, TRANS_NO_DATA_CONTROL ; set transaction type to no data control
mov [ep0_transtype], A
mov A, STATUS_IN_ONLY ; set SIE for STATUS IN mode
iowr ep0_mode
pop A
pop X
reti
;;***************** UNSUPPORTED TRANSACTION ***************
request_not_supported:
iord ep0_mode
mov A, STALL_IN_OUT ; send a stall to indicate that the request
iowr ep0_mode ; is not supported
pop A
pop X
reti
;**********************************************************
;**********************************
; IN - CONTROL READ DATA STAGE
; - CONTROL WRITE STATUS STAGE
; - NO DATA CONTROL STATUS STAGE
ep0_in_received:
mov A, [ep0_transtype]
jacc ep0_in_jumptable
;**********************************
control_read_data_stage:
mov X, 00h
mov A, [maximum_data_count]
cmp A, 00h ; has all been sent
jz dmabuffer_load_done
dmabuffer_load:
mov A, X ; check if 8 byte ep0 dma
cmp A, 08h ; buffer is full
jz dmabuffer_load_done
mov A, [data_start] ; read data from desc. table
index control_read_table
mov [X + ep0_dmabuff0], A
inc X ; increment buffer offset
inc [data_start] ; increment descriptor table pointer
dec [maximum_data_count] ; decrement number of bytes requested
jz dmabuffer_load_done
jmp dmabuffer_load ; loop to load more data
dmabuffer_load_done:
iord ep0_count ; unlock counter register
mov A, X ; find number of bytes loaded
or A, [ep0_data_toggle] ; or data toggle
iowr ep0_count ; write ep0 count register
mov A, ACK_IN_STATUS_OUT ; set endpoint mode to ack next IN
iowr ep0_mode ; or STATUS OUT
mov A, DATA_TOGGLE ; toggle data toggle
xor [ep0_data_toggle], A
pop A
pop X
reti
;**********************************
control_write_status_stage:
mov A, STATUS_OUT_ONLY
iowr ep0_mode
mov A, TRANS_NONE
mov [ep0_transtype], A
pop A
pop X
reti
;**********************************
no_data_control_status_stage:
mov A, [ep0_in_flag] ; end of no-data control transaction
cmp A, ADDRESS_CHANGE_PENDING
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