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usbnew.spin2
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usbnew.spin2
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{{
"USBNEW" modular USB input driver - v1.1.6
By Ada Gottensträter ("Wuerfel_21")
Original 1CogKbM code by Garry Jordan ("garryj")
Hub support and significant portions by Marco Maccaferri ("macca")
TERMS OF USE: MIT License
}}
CON
DEBUG_DISABLE = true
CLKFREQ_PTR = $14
USB_BASE_PIN = 16
USB_ENABLE_OFFSET = 1 ' Set -1 if not present
USB_DMINUS_OFFSET = 2 ' Must end up on an even pin. D+ is always this +1
ACTIVITY_LED = -1
ERROR_LED = -1
OVERLAP_MEMORY = false ' save memory at cost of making the driver non-reentrant
KEYQUEUE_SIZE = 0
NUMLOCK_DEFAULT_STATE = true
RPI_KEYBOARD_NUMLOCK_HACK = true
HAVE_MOUSE = false
MOUSE_FULL_PROTOCOL = false ' Experimental: Use full HID report protocol for mice
HAVE_HIDPAD = false ' Set to false to disable HidPad inteface
HIDPAD_REPORT_SIZE = 8*4 ' do not change!
EMUPAD_MAX_PLAYER = 0 ' Set to 0 to disable EmuPad interface
EMUPAD_MAX_RULES = 32
EMUPAD_BUILTIN_RULES = false
' EmuPad report format config
EMUPAD_TYPE_NIBBLE = 7
EMUPAD_TYPE_KBD = 1
EMUPAD_TYPE_PAD = 2
EMUPAD_UP_BIT = 0
EMUPAD_DOWN_BIT = 1
EMUPAD_LEFT_BIT = 2
EMUPAD_RIGHT_BIT = 3
EMUPAD_BT0_BIT = 4
EMUPAD_BT1_BIT = 5
EMUPAD_BT2_BIT = 6
EMUPAD_BT3_BIT = 7
EMUPAD_BT4_BIT = 8
EMUPAD_BT5_BIT = 9
EMUPAD_BT6_BIT = 10
EMUPAD_BT7_BIT = 11
EMUPAD_BT8_BIT = 12
EMUPAD_BT9_BIT = 13
' EmuPad default keyboard map
' You should probably override these
EMUPAD_KB_UP = KEY_UP
EMUPAD_KB_DOWN = KEY_DOWN
EMUPAD_KB_LEFT = KEY_LEFT
EMUPAD_KB_RIGHT = KEY_RIGHT
EMUPAD_KB_BT0 = KEY_D
EMUPAD_KB_BT1 = KEY_V
EMUPAD_KB_BT2 = KEY_C
EMUPAD_KB_BT3 = KEY_X
EMUPAD_KB_BT4 = KEY_F
EMUPAD_KB_BT5 = KEY_G
EMUPAD_KB_BT6 = KEY_T
EMUPAD_KB_BT7 = KEY_Y
EMUPAD_KB_BT8 = KEY_BACKSPACE
EMUPAD_KB_BT9 = KEY_ENTER
' Computed magic values
_EMUPAD_UD_MASK = (decod EMUPAD_UP_BIT) | (decod EMUPAD_DOWN_BIT)
_EMUPAD_LR_MASK = (decod EMUPAD_LEFT_BIT) | (decod EMUPAD_RIGHT_BIT)
_EMUPAD_RULE_SIZE = 10+4+1
_HAVE_GAMEPAD = HAVE_HIDPAD || (EMUPAD_MAX_PLAYER > 0)
MAX_DEVICES = 7 ' DO. NOT. TOUCH.
OBJ '' Startup/configuration
PUB start() : r
ifnot driver_cog
r := coginit(COGEXEC_NEW,@usb_host_start,0)
if r >= 0
driver_cog := r+1
PUB stop()
if driver_cog
cogstop(driver_cog-1)
ifnot OVERLAP_MEMORY ' if OVERLAP_MEMORY, be careful
driver_cog := 0
pinclear(dm addpins 1)
if usb_enable_pin >= 0
pinclear(usb_enable_pin)
'' Get current driver cog or -1 if not running
PUB current_cog() : r
return driver_cog - 1
'' Must be called before start()
PUB set_basepin(pin)
if USB_ENABLE_OFFSET >= 0
usb_enable_pin := pin+USB_ENABLE_OFFSET
dm := pin+USB_DMINUS_OFFSET
dp := pin+USB_DMINUS_OFFSET+1
'' Must be called before start()
PUB set_pins_explicit(enable,dminus)
usb_enable_pin := enable
dm := dminus
dp := dminus+1
OBJ '' Keyboard State API
'' (Always enabled)
'' Get current pressed state of a keyboard key
PUB keystate(key) : r | buf[2],tmp
if key >= $E0 && key < $E8
return not not (hkbd_report.byte[0] >> (key-$E0))
else
'' Do this in inline ASM to ensure atomicity
tmp := @hkbd_report
org
setq #1
rdlong buf,tmp
getbyte tmp,buf+0,#2
cmp tmp,key wz
getbyte tmp,buf+0,#3
if_nz cmp tmp,key wz
getbyte tmp,buf+1,#0
if_nz cmp tmp,key wz
getbyte tmp,buf+1,#1
if_nz cmp tmp,key wz
getbyte tmp,buf+1,#2
if_nz cmp tmp,key wz
getbyte tmp,buf+1,#3
if_nz cmp tmp,key wz
if_z neg r,#1
end
PUB ledstates() : r
return hkbd_led_rep
OBJ '' Keyboard queue API
'' Set KEYQUEUE_SIZE to enable (recommended value: 32)
'' Return key event from buffer if there is one
PUB get_key() : r | tail
tail := keyq_tail
if keyq_head == tail
return 0 ' No event
r := keyq_data[tail]
if ++tail == KEYQUEUE_SIZE
tail := 0
keyq_tail := tail
'' Peek top of key event buffer (returns 0 if no pending event)
PUB peek_key() : r | tail
tail := keyq_tail
if keyq_head == tail
return 0 ' No event
else
return keyq_data[tail]
OBJ '' Mouse API
'' Set HAVE_MOUSE to enable
'' Get mouse coordinates
PUB mouse_xy() : x,y
x := mouse_xacc
y := mouse_yacc
'' Get mouse scrolling (horizontal scroll NYI)
PUB mouse_scroll() : x,y
x := 0
y := mouse_zacc
'' Emulate mouse movement
PUB mouse_move(x,y)
mouse_lock := 1
waitus(2) ' hope driver is now done
mouse_xacc := x
mouse_yacc := y
if mouse_outptr
long[mouse_outptr] := y << 16 | x & $FFFF
mouse_lock := 0
'' Get mouse buttons state
PUB mouse_buttons() : r
return mouse_bstate
'' Set limits for mouse movement
PUB mouse_set_limits(xlim,ylim)
mouse_limits[0] := xlim
mouse_limits[1] := ylim
'' Set pointer for "hardware" sprite control
PUB mouse_set_outptr(ptr)
mouse_outptr := ptr
OBJ '' HIDPad API
'' Set HAVE_HIDPAD to enable.
'' Warning: never pass a device ID larger or equal than MAX_DEVICES
'' Get VID/PID pair for connected device. 0 means disconnected
PUB hidpad_id(dev) : r
return long[@hidpad_report+dev*HIDPAD_REPORT_SIZE][0]
'' Get device capabilites. These are often false-positive.
'' (i.e. axis marked as valid, but not physically extant on device)
'' xxxxxxxx_wsrrrzyx_hhhhaaaa_bbbbbbbb
'' hlzyx||| |||||||| ++++++++ n. buttons
'' |||||||| ||||++++--------- n. axes
'' |||||||| ++++------------- n. hats
'' ++++++++------------------ valid axes
PUB hidpad_getcaps(dev) : r
return long[@hidpad_report+dev*HIDPAD_REPORT_SIZE][1]
'' Get all button states for a device
PUB hidpad_buttons(dev) : r
return long[@hidpad_report+dev*HIDPAD_REPORT_SIZE][6]
'' Get state of one button
PUB hidpad_button(dev,bnum) : r
if bnum +>= 32
return false
else
return long[@hidpad_report+dev*HIDPAD_REPORT_SIZE][6].[bnum]
'' Get state of an axis (normalized between -32768 and 32767)
PUB hidpad_axis(dev,axnum) : r
if axnum +>= 8
return 0
else
return word[@hidpad_report+dev*HIDPAD_REPORT_SIZE][4+axnum] signx 15
'' Get state of a hat
PUB hidpad_hat(dev,hatnum) : r
if hatnum +>= 4
return 0
else
return byte[@hidpad_report+dev*HIDPAD_REPORT_SIZE][7*4+hatnum]
OBJ '' EmuPad API
'' Set EMUPAD_MAX_PLAYER to enable
'' See docs for more details
PUB set_emupad_ptr(ptr) ' Call before starting!
if EMUPAD_MAX_PLAYER > 0
emupad_out_ptr := ptr
PUB get_emupad_rule_buffer() : r
return @emupad_rule_buffer
OBJ '' Raw buffer getters (for advanced/debug use)
PUB get_keyboard_raw_buffer() :r
return @hkbd_report
PUB get_hidpad_buffer() : r
return @hidpad_report
DAT ' Startup for ASM only
{
org $000
asmclk
drvl #56
drvl #57
coginit #0, ##@usb_host_start
}
DAT ' USB Host driver
org $000
usb_host_start
mov hcog_base_addr, ptrb
mov htmp, ##@hlut_end - 4 - @hlut_start ' Dealing with hub addresses
shr htmp, #2 ' so byte->long for the lut cell count
loc pb, #@hlut_start - @usb_host_start
add pb, hcog_base_addr
setq2 htmp
rdlong 0, pb ' Do the hub->lut copy
loc pb, #@usb_host_init - @usb_host_start
add pb, hcog_base_addr
jmp pb ' Initialize host and enter main processing loop
'------------------------------------------------------------------------------
' SETUP transaction. The mechanics of SETUP are identical to OUT, but it's
' special because the receiving function must not respond with either STALL or
' NAK, and must accept the DATAx packet that follows the SETUP token. If a
' non-control endpoint receives a SETUP token, or the function receives a
' corrupt packet, it must ignore the transaction
'------------------------------------------------------------------------------
' On entry:
' PTRA - start address of the SETUP data struct.
' On exit:
' retval - PID_ACK on success, otherwise error code.
'------------------------------------------------------------------------------
txn_setup
setbyte ep_addr_pid, #PID_SETUP, #0
mov pkt_data, #SETUP_TXN_LEN ' SETUP is single fixed size DATAx packet
bitl hstatus, #DATAx_TGLB ' And always uses DATA0 packet
mov retry, #TXN_RETRIES ' Retries possible as function will ignore a corrupt packet
mov pa, ptra ' Save SETUP struct pointer in case of retry
.setup
call #txn_out ' SETUP/OUT are the same transaction type, just different PIDs
cmp retval, #PID_ACK wz
if_z ret
call #retry_wait
cmp retval, #ERR_TXN_RETRY wz
if_z ret
mov ptra, pa ' Restore SETUP's DATAx pointer
jmp #.setup
'------------------------------------------------------------------------------
' IN/INTERRUPT transaction.
' Possible function response: STALL or NAK handshake, or DATAx packet.
'------------------------------------------------------------------------------
' On entry:
' ep_addr_pid - PID_IN(b0..7), address(b8..b14), endpoint(b15..18) and
' CRC(b19..23).
' On exit:
'------------------------------------------------------------------------------
txn_in
call #wait_txn_ok ' ISR: ensure txn doesn't cross frame boundary
setbyte ep_addr_pid, #PID_IN, #0
call #utx_token ' Put IN request on the bus
' Fall through to urx_packet
'------------------------------------------------------------------------------
' Wait for a packet from a device/function. As host, the only two packet types
' received are handshakes and IN DATAx.
'------------------------------------------------------------------------------
' On entry:
' On exit:
' retval - the ID of the packet. If a PID fails validation, ERR_PACKET is
' returned.
'------------------------------------------------------------------------------
urx_packet
rqpin urx, dm ' Wait until start-of-packet signal appears on the USB.
testb urx, #SOPB wc
if_c jmp #urx_packet
getct hct2
addct2 hct2, tat_wait ' Start the response turn-around timer
bitl hstatus, #EOPB ' Make sure sticky EOP flag is clear
mov newb_flg, #0 ' Initialize for multi-byte read
.wait_sop
rdpin urx, dm
testb urx, #SOPB wc
if_c jmp #.get_pid
jnct2 #.wait_sop
_ret_ mov retval, #ERR_TAT
.get_pid
call #urx_next
testb urx, #BUS_ERRB wc
if_nc jmp #.chk_pid
_ret_ mov retval, #ERR_URX
.chk_pid
cmp retval, #PID_ACK wz
if_nz cmp retval, #PID_NAK wz
if_nz cmp retval, #PID_STALL wz
if_z jmp #.chk_eop ' Handshake, so check that packet is single byte
testb hstatus, #DATAx_TGLB wc ' Get low/full speed even/odd DATAx sequence to look for
cmp retval, #PID_DATA0 wz
if_z_and_nc jmp #urx_data ' DATA0 and sequence match
if_z_and_c jmp #.ack_resend ' Sequence error. Ignore data, resend the ACK that the device must have missed
cmp retval, #PID_DATA1 wz
if_z_and_c jmp #urx_data ' DATA1 and sequence match
if_z_and_nc jmp #.ack_resend
_ret_ mov retval, #ERR_PACKET ' Some other bus error...
.ack_resend
rqpin urx, dm
testb urx, #EOPB wc
if_nc jmp #.ack_resend
mov retval, #PID_ACK
call #utx_handshake ' Send handshake PID and return to caller
_ret_ mov retval, #ERR_DATAX_SYNC
.chk_eop
testb hstatus, #LOW_SPEEDB wc
if_nc jmp #.idle ' Full-speed doesn't need an additional read to get EOP status
call #urx_next ' Low-speed requires an additional read to get EOP status
testb hstatus, #EOPB wc
if_c jmp #.idle ' Low-speed EOP seen
testb urx, #BUS_ERRB wz
if_nc mov retval, #ERR_PACKET ' No EOP where one was expected
if_z mov retval, #ERR_URX ' Bit unstuff error, EOP SE0 > 3 bits or SE1, so we're hosed
ret
.idle
rqpin urx, dm
testb urx, #J_IDLEB wc
if_nc jmp #.idle ' Wait for bus IDLE before returning handshake result
ret
'------------------------------------------------------------------------------
' Send a token packet with CRC5 checksum of address and endpoint. It is the
' responsibility of the caller to append the appropriate inter-packet delay,
' if one is required.
'------------------------------------------------------------------------------
' On entry:
' ep_addr_pid - packed with the PID, address and endpoint.
' On exit:
'------------------------------------------------------------------------------
utx_token
rqpin urx, dm
testb urx, #J_IDLEB wc
if_nc jmp #utx_token
testb hstatus, #DWNSTRM_HUBB wc
if_c call #utx_pre
mov utx, #OUT_SOP
call #utx_byte ' Send sync byte
mov htmp, ep_addr_pid ' Preserve the PID and destination
mov pkt_cnt, #3
.next_byte
getbyte utx, htmp, #0 ' Bytes on the bus LSB->MSB
shr htmp, #8 ' Shift to next byte to send
.wait
testp dp wc
if_nc jmp #.wait
akpin dp
wypin utx, dm
_ret_ djnz pkt_cnt, #.next_byte
'------------------------------------------------------------------------------
' SETUP/OUT/INTERRUPT transaction.
' Possible function response in order of precedence: STALL, ACK, NAK.
'------------------------------------------------------------------------------
' On entry:
' ep_addr_pid - PID_OUT(b0..7), address(b8..b14), endpoint(b15..18) and
' CRC(b19..23).
' PTRA - start address of the data buff/struct that has the bytes to send.
' pkt_data - count of DATAx payload bytes to send.
' On exit:
'------------------------------------------------------------------------------
txn_out
call #wait_txn_ok ' ISR: ensure txn doesn't cross frame boundary
call #utx_token ' Put SETUP/OUT token on the bus
rdfast ##$80000000, ptra ' Use hub RAM FIFO interface to read the tx buffer
mov pkt_cnt, pkt_data
' Fall through to utx_data
'------------------------------------------------------------------------------
' Transmit a DATAx packet with USB-16 checksum of payload. The payload CRC is
' calculated while the data byte is being shifted out. Since data stage
' success/fail is not determined until the status stage of the transaction,
' this routine is only concerned about the current DATAx packet.
'------------------------------------------------------------------------------
' On entry:
' PTRA - hub start address of the data to read.
' pkt_cnt - data payload size.
' On exit:
'------------------------------------------------------------------------------
utx_data
rqpin urx, dm
testb urx, #SOPB wc
if_c jmp #utx_data
mov hctwait, ip_delay
call #poll_waitx ' SETUP/OUT token always precedes tx DATAx so insert IP delay
testb hstatus, #DWNSTRM_HUBB wc
if_c call #utx_pre
mov utx, #OUT_SOP
call #utx_byte ' Send sync
bmask crc, #15 ' Prime the CRC16 pump
testb hstatus, #DATAx_TGLB wc ' Set the requested DATAx PID
if_nc mov utx, #PID_DATA0
if_c mov utx, #PID_DATA1
call #utx_byte ' No CRC calc done on PID
cmp pkt_cnt, #0 wz ' Check if sending a zero length payload
if_z jmp #.send_crc ' If so, only the CRC goes out
.read_byte
rfbyte utx ' Fetch data byte
call #utx_byte
rev utx ' Calculate CRC while the data is shifting out
setq utx ' SETQ left-justifies the reflected data byte
crcnib crc, usb16_poly_r ' Run CRC calc on the data nibs
crcnib crc, usb16_poly_r
djnz pkt_cnt, #.read_byte
.send_crc
bitnot crc,#0 addbits 15 ' Final XOR, and send the calculated CRC16
getbyte utx, crc, #0
call #utx_byte
getbyte utx, crc, #1
call #utx_byte ' Last CRC byte out
jmp #urx_packet ' Handle function response/error and back to caller
'------------------------------------------------------------------------------
' Receive a DATAx_ payload with USB-16 checksum. The CRC is calculated as the
' payload bytes are received. The routine reads bytes until EOP is detected and
' expects that the packet includes at least the CRC word.
'
' In control transfers, it's possible to recieve fewer data bytes than what
' was requested, which makes it difficult to determine where the data stops
' and the CRC word begins. So the CRC calculation is done on every byte of the
' packet, including the CRC word. The CRC value should then be equal to the
' USB-16 expected residual value of 0xB001.
'
' The routine writes the IN packet data to a static max_packet_size buffer
' so the caller can verify IN success before writing the data to its final
' destination.
'------------------------------------------------------------------------------
' On entry:
' pkt_data - max byte count expected to be in the packet.
' newb_flg - signals new byte ready when toggled.
' On exit:
' pkt_cnt - actual number of bytes read.
'------------------------------------------------------------------------------
urx_data
mov htmp2, pb
mov pb, urx_buff_p
wrfast ##$80000000, pb ' Use hub RAM FIFO interface to buffer bytes received
mov pb, htmp2
bmask crc, #15 ' Prime the CRC16 pump
mov pkt_cnt, #0 ' Keep track of payload bytes received
mov pkt_tmp, pkt_data
add pkt_tmp, #2 ' Tweak payload byte count to include CRC word
.wait_byte
' In-line rx for max speed
rqpin urx, dm
mov utx, #BYTE_TGLF ' Reg utx free in this context
and utx, urx
cmp newb_flg, utx wz ' Fetch a byte whenever the flags differ
if_nz xor newb_flg, #BYTE_TGLF ' Synchronize flags
if_nz jmp #.get_byte ' New byte!
testb urx, #EOPB wc
if_c jmp #.chk_crc ' At end-of-packet
jmp #.wait_byte
.get_byte
getbyte retval, urx, #1 ' New byte from smart pins
wfbyte retval ' Add it to the data buffer
rev retval ' Calculate CRC while next byte is shifting in
setq retval ' SETQ left-justifies the reflected data byte
crcnib crc, usb16_poly_r ' Run CRC calc on the data nibs
crcnib crc, usb16_poly_r
.end_crc
add pkt_cnt, #1
cmp pkt_cnt, pkt_tmp wcz
if_a mov retval, #ERR_PACKET ' Error if payload > expected size
if_a ret
' For full-speed at 80MHz, the time it takes to do the final byte write and
' CRC verify has likely put us into the EOP zone. The P2 smart pins keep the
' EOP flag "sticky" for 7-bits of J, but at 80MHz, it still could be possible
' to miss it, so cheat a bit and look for SOP clear here.
rqpin urx, dm
testb urx, #EOPB wc ' FIXME: checking for EOP set should work when > 80MHz
if_nc jmp #.wait_byte ' Next read will catch EOP at low-speed
' CRC OK = Payload CRC calc ^ packet's CRC bytes = $B001 (the USB-16 expected residual)
.chk_crc
sub pkt_cnt, #2 ' Adjust payload count to exclude the CRC bytes read
xor crc, ##USB16_RESIDUAL wz ' CRC of (data + transmitted CRC) XOR residual should equal zero
if_nz jmp #urx_packet ' CRC fail; discard data and wait until data re-sent or transfer timeout
mov retval, #PID_ACK
mov hctwait, ip_delay
call #poll_waitx
' Fall through to utx_handshake
'------------------------------------------------------------------------------
' Transmit a handshake PID. The routine assumes that the bus is IDLE and
' the appropriate IP delay has been inserted.
'------------------------------------------------------------------------------
' On entry:
' retval - handshake PID to send.
' On exit:
' retval unchanged.
'------------------------------------------------------------------------------
utx_handshake
testb hstatus, #DWNSTRM_HUBB wc
if_c call #utx_pre
mov utx, #OUT_SOP
call #utx_byte ' Send sync
mov utx, retval
call #utx_byte ' Send handshake PID
.idle
rqpin urx, dm
testb urx, #J_IDLEB wc
if_nc jmp #.idle ' Wait for IDLE to ensure the PID tx is complete
mov hctwait, tat_wait ' Ensure one turn-around time before next transaction
jmp #poll_waitx
'------------------------------------------------------------------------------
' Wait for the USB tx buffer to empty and feed it a new byte.
'------------------------------------------------------------------------------
' On entry:
' utx - byte to transmit.
' On exit:
'------------------------------------------------------------------------------
utx_byte
testp dp wc
if_nc jmp #utx_byte
akpin dp
waitx utx_tweak ' Wait #0 '#3 if < 180MHz, wait #3 '#20 if 180MHz+
_ret_ wypin utx, dm
'------------------------------------------------------------------------------
' Fetch the next data byte of a packet. Always check receiver status for EOP.
'------------------------------------------------------------------------------
' On entry:
' On exit:
' retval - the byte read.
' urx - the receiver status. The caller must check the hstatus reg EOP flag
' on return. If EOP is set, the byte in reg retval remains as the last byte
' received.
'------------------------------------------------------------------------------
urx_next
rdpin urx, dm
mov utx, #BYTE_TGLF ' Reg utx free in this context
and utx, urx
cmp newb_flg, utx wz ' Fetch a byte whenever the flags differ
if_nz xor newb_flg, #BYTE_TGLF ' Synchronize flags
if_nz getbyte retval, urx, #1 ' Fetch the new byte
if_nz ret ' New byte is priority, so return now
testb urx, #SOPB wc
testb urx, #BUS_ERRB wz
if_c_and_nz jmp #urx_next ' If SOP still raised and !BUS_ERRB a new byte should be coming
if_nc bith hstatus, #EOPB ' If EOP make it sticky, otherwise it's a bus error
ret
'------------------------------------------------------------------------------
' Calculate USB-5 CRC. The upper word of the CRC pre-calc table in LUT contains
' the data used for the USB-5 CRC lookups. The token packet is three bytes in
' length, and the PID is not included in the CRC calculation:
' CRC5 FRAME_NUMBER SOF (full-speed)
' CRC5 ENDP ADDRESS PID
' %00000_1111_1111111_xxxxxxxx
'------------------------------------------------------------------------------
' On entry:
' ep_addr_pid - stuffed with the function endpoint, address and
' SETUP/IN/OUT/SOF PID according to the USB standard.
' On exit:
' ep_addr_pid - CRC value appended to the packet.
'------------------------------------------------------------------------------
calc_crc5
and ep_addr_pid, ##EP_ADDR_MASK ' Clear existing CRC, if any
mov htmp, ep_addr_pid
shr htmp, #8 ' PID not included in CRC calc
mov crc, #$1f ' Initial CRC5 value
rev htmp ' Input data reflected
setq htmp ' CRCNIB setup for data bits 0..7
crcnib crc, #USB5_POLY
crcnib crc, #USB5_POLY ' Data bits 0..7 calculated
shl htmp, #9 wc ' Shift out processed bits + 1 to set up CRC of remaining bits 8..10
crcbit crc, #USB5_POLY ' Inline instead of REP as we're in hubexec
shl htmp, #1 wc
crcbit crc, #USB5_POLY
shl htmp, #1 wc
crcbit crc, #USB5_POLY
xor crc, #$1f ' Final XOR value
shl crc, #8 + 11 ' CRC to bits 23..19 of the token packet
_ret_ or ep_addr_pid, crc ' Put the CRC in its new home
'------------------------------------------------------------------------------
' Full-speed/low-speed frame timing interrupt service routine.
'------------------------------------------------------------------------------
isr1_fsframe
getct iframe_ct_base
mov iframe_ct_new, iframe_ct_base
addct1 iframe_ct_new, _frame1ms_clks_
wxpin _usb_h_fs_nco_, dm ' Restore host mode and 12Mbs baud
.wait
testp dp wc
if_nc jmp #.wait
akpin dp
mov utx, #PID_SOF
wypin #OUT_SOP, dm ' Put start-of-packet SYNC field on the USB
call #utx_byte ' Send token PID byte
mov icrc, #$1f ' Prime the CRC5 pump
mov sof_pkt, frame ' CRC5 calculation done on the 11-bit frame number value
rev sof_pkt ' Input data reflected
setq sof_pkt ' CRCNIB setup for data bits 0..7
crcnib icrc, #USB5_POLY
crcnib icrc, #USB5_POLY ' Data bits 0..7 calculated
getbyte utx, frame, #0 ' Send the low byte of the frame number
call #utx_byte
shl sof_pkt, #8 ' Shift out processed bits to set up CRCBIT * 3
rep #2, #3 ' Three data bits left to process
shl sof_pkt, #1 wc
crcbit icrc, #USB5_POLY ' Data bits 8..10 calculated
xor icrc, #$1f ' Final XOR value
getbyte utx, frame, #1 ' Send remaining frame number bits
shl icrc, #3 ' Merge CRC to bits 7..3 of the final token byte
or utx, icrc
call #utx_byte ' Last start-of-frame byte is on the wire
mov isrtmp1, _ip_delay_fs_ ' Use normal inter-packet delay when full-speed
jmp #isr1_wait
isr1_lsframe
getct iframe_ct_base
mov iframe_ct_new, iframe_ct_base
addct1 iframe_ct_new, _frame1ms_clks_
.wait
testp dp wc
if_nc jmp #.wait
akpin dp
wypin #OUT_EOP, dm ' EOP is the low-speed keep-alive strobe
mov isrtmp1, _ip_delay_ls_ ' Normal inter-packet delay works when low-speed
isr1_wait
rqpin utx, dm
testb utx, #SOPB wc
if_c jmp #isr1_wait
add frame, #1 ' Next frame# and check for wrap around
and frame, ##$7ff
waitx isrtmp1 ' Make sure bus is idle
reti1
'------------------------------------------------------------------------------
' Wait for a window within the 1ms frame boundary that will ensure that a
' transaction will complete before the next frame is triggered.
'------------------------------------------------------------------------------
' On entry:
' On exit:
'------------------------------------------------------------------------------
wait_txn_ok
getct htmp2
sub htmp2, iframe_ct_base
testb hstatus, #LOW_SPEEDB wc
if_c cmp htmp2, _txn_ok_ls_ wcz
if_nc cmp htmp2, _txn_ok_fs_ wcz
if_a jmp #wait_txn_ok ' Not enough time, so wait until next frame
ret
'------------------------------------------------------------------------------
' A device connection was detected, or a bus reset was requested by the USB
' client. Set the appropriate smart pin FS/LS speed mode to match the device
' and perform a reset sequence prior to device enumeration.
'------------------------------------------------------------------------------
dev_reset
rqpin urx, dm
testb urx, #K_RESUMEB wc ' K differential "1" in FS mode signals low-speed
if_c call #set_speed_low ' The speed config subroutines must restore the caller C flag
if_nc call #set_speed_full ' state on return if it writes the C flag.
reset
setint1 #0 ' Don't want frame interrupt while in reset
wypin #OUT_SE0, dm ' Assert bus reset
waitx _reset_hold_ ' Spec is >= 10ms
wypin #OUT_IDLE, dm
mov frame, #0 ' Reset the frame timespan count
getct iframe_ct_base
mov iframe_ct_new, iframe_ct_base
addct1 iframe_ct_new, _frame1ms_clks_
mov htmp, frame ' Allow reset recovery time (Section 9.2.6.2)
add htmp, #36
setint1 #1 ' Set ISR event trigger to CT-passed-CT1
.framewait
cmp frame, htmp wcz
if_b jmp #.framewait
ret
'------------------------------------------------------------------------------
' Bulk hub<->hub byte copy. Does not check for src/dest buffer overlap.
'------------------------------------------------------------------------------
' On entry:
' PTRA - source address.
' PB - destination address.
' hr0 - length of copy, in bytes.
' On exit:
'------------------------------------------------------------------------------
hmemcpy
rdbyte htmp, ptra++
wrbyte htmp, pb
add pb, #1
_ret_ djnz hr0, #hmemcpy
'------------------------------------------------------------------------------
' A fatal USB error has occured. Notify the client and spin in a pseudo-idle
' loop until the errant device is disconnected.
'------------------------------------------------------------------------------
' On entry:
' On exit:
'------------------------------------------------------------------------------
host_error
if ERROR_LED >= 0
drvl host_error_led
end
jmp #host_reset ' See if it works...
'------------------------------------------------------------------------------
' Get HID descriptor buffer for current port
'------------------------------------------------------------------------------
' On entry:
' On exit:
' PB - HID descriptor buffer pointer
'------------------------------------------------------------------------------
get_hid_descr_buffer
mov pb, hdev_port
cmpsub pb, #1
mul pb, #HID_DESCR_LEN
_ret_ add pb, hid_descr_p
usb16_poly_r long USB16_POLY
' USB commands and error codes
cmd_data long 0
usb_err_code long ERR_NONE
' Parameters block assigned at cog startup
dm long USB_BASE_PIN + USB_DMINUS_OFFSET ' Client defines the basepin for four consecutive USB port pins
dp long USB_BASE_PIN + USB_DMINUS_OFFSET + 1
usb_enable_pin long USB_ENABLE_OFFSET < 0 ? -1 : USB_BASE_PIN + USB_ENABLE_OFFSET
if ACTIVITY_LED >= 0
host_active_led long ACTIVITY_LED ' Client defines the LED pin# for host bus activity
end
if ERROR_LED >= 0
host_error_led long ERROR_LED ' Client defines the LED pin# to light on error
end
hid_descr_p long 0
'hid_report_p long 0, 0[MAX_DEVICES]
'hkbd_report_p long 0
hub_descr_p long 0
urx_buff_p long 0
dev_desc_buff_p long 0
con_desc_buff_p long 0
cache_start_p long 0
cache_end_p long 0
if EMUPAD_MAX_PLAYER > 0
emupad_out_ptr long 0
end
save_sysclk long 0 ' Save the current sysclock as the client may change it
hdev_init_start
hdev_port res 1
hdev_next_datax res ((1+MAX_DEVICES)+3)/4 ' 1+7 byte
kbm_next_datax res 1
hub_intf_num res 1
hub_next_datax res 1
hub_status_chg res 1
hub_port_status res 1
if HAVE_MOUSE
ms_intf_num res 1
ms_in_max_pkt res 1
end
kb_intf_num res 1
kb_interval res 1
kb_in_max_pkt res 1
kb_max_index res 1
kb_led_states res 1
gp_intf_num res 1
gp_interval res 1
gp_max_index res 1
gp_descr_len res 1+MAX_DEVICES
hdev_init_end
' Initialized at cog startup:
hcog_base_addr res 1 ' This object's start address in hub, read from PTRB at cog creation
iframe_ct_new res 1
iframe_ct_base res 1
utx_tweak res 1 ' Sysclock speeds above ~120MHz need some fairy dust for USB tx
' This register block is reset to zero when a USB device connects
hreg_init_start
hstatus res 1 ' Host status flags
hctwait res 1 ' Poll-based wait clocks
ip_delay res 1 ' Inter-packet delay in bit periods for connected device speed
tat_wait res 1 ' Maximum bus turn-around time in bit periods for connected device speed
nak_retry res 1 ' NAK retry count, unlimited retries if zero
xfer_retry res 1 ' Control transfer retry count
retry res 1 ' Transaction retry count
utx res 1 ' Byte to transmit on USB
urx res 1 ' LSByte receiver status flags, MSByte received data
newb_flg res 1 ' Receive "new byte" bit toggle detector
max_pkt_size res 1 ' Maximum payload bytes allowed, likely to change on device connect.
total_data res 1 ' Total bytes to tx/rx in a transfer data stage
stage_data res 1 ' Count of bytes sent/received so far during a data stage.
pkt_data res 1 ' Payload size of an OUT packet or bytes received on IN
frame res 1 ' USB 1ms frame counter value
sof_pkt res 1 ' ISR frame# packet and CRC5
icrc res 1 ' Only used by the 1ms frame output ISR routine
pkt_cnt res 1 ' Count of DATAx packet payload bytes
crc res 1 ' Used for CRC16 calculation
ep_addr_pid res 1 ' Endpoint and device addresses for connected device
retval res 1 ' Global success/fail return parameter
context_retval res 1 ' Operation contextual return parameter
' Device stuff
hdev_id res 1+MAX_DEVICES
hdev_bcd res 1
hdev_type res ((1+MAX_DEVICES)+3)/4 ' Configured device indicator
' Keyboard/mouse stuff
hctrl_ep_addr res 1
hctrl_max_pkt res 1
hconfig_base res 1
hcon_tot_len res 1 ' Size of the complete config descriptor chain
hdev_intf_idx res 1 ' Used during verbose descriptor terminal output
hdev_class res 1
hdev_subclass res 1
hdev_protocol res 1
hsearch_key res 1 ' Descriptor type to search for in the config chain
hnext_desc res 1 ' Offset from the config descriptor start address to the next descriptor in the chain
hhub_ctrl_ep res 1 ' Hub control endpoint address
hhub_ep_addr res 1 ' Hub interface endpoint address
hkbd_ctrl_ep res 1 ' Keyboard control endpoint address
hkbd_ep_addr res 1 ' Keyboard interface endpoint address
if HAVE_MOUSE
hmouse_ep_addr res 1 ' Mouse interface endpoint address
end
hkbd_poll_cnt res 1 ' Poll interval counter used for key auto-repeat
hkbd_ledstates res 1 ' Off/on state of keyboard LEDs
hdev_ep_addr res 1+MAX_DEVICES
hdev_out_addr res 1
if EMUPAD_MAX_PLAYER > 0
hkbd_emupad_buffer res EMUPAD_MAX_PLAYER
hpad_emupad_buffer res EMUPAD_MAX_PLAYER
hpad_emupad_rule res 1+MAX_DEVICES ' This is PER REAL DEVICE
end
hreg_init_end
hidr_start
hidr_usage res 1 ' <- can get trashed after parsing
hidr_flags res 1
hidr_axis res 4
hidr_buttons res 1
hidr_hats res 1
'' Above are actually useful values, 6 longs
hidr_type res 1
hidr_id res 1
hidr_offset res 1
hidr_usage_idx res 1
' below need to be push/pop'd
hidr_state res 1
hidr_size res 1
hidr_count res 1
hidr_lminmax res 1
hidr_pminmax res 1
hidr_end
' Variables dependent on the system freqency
_var_64_lower_ res 1
_var_64_upper_ res 1
_12Mbps_ res 1
_1_5Mbps_ res 1
_1ns16fp_ res 1 ' 1ns as 32,16 fixed point
_1us_ res 1 ' 1us
_10us_ res 1 ' 10us
_33us_ res 1 ' 33us
_txn_err_ res 1 ' 250us
_500us_ res 1 ' 500us
_txn_ok_ls_ res 1 ' 666us timespan for LS transaction OK window
_txn_ok_fs_ res 1 ' 850us timespan for FS transaction OK window
_ip_delay_ls_ res 1 ' Low-Speed inter-packet 4 bit-time delay
_ip_delay_fs_ res 1 ' Full-Speed inter-packet 4 bit-time delay
_tat_wait_ls_ res 1 ' Low-Speed turnaround 22 bit-time wait
_tat_wait_fs_ res 1 ' Full-Speed turnaround 28 bit-time wait
_preamble_wait_ res 1
_1ms_ res 1 ' 1ms
_2ms_ res 1 ' 2ms
_suspend_wait_ res 1 ' 3ms
_4ms_ res 1 ' 4ms
_xfer_wait_ res 1 ' 5ms
_8ms_ res 1 ' 8ms timespan for keyboard/mouse interrupt IN transactions
_reset_hold_ res 1 ' 15ms
_resume_hold_ res 1 ' Hold K-state for 20ms to signal device(s) to resume
_21ms_ res 1 ' 21ms
_100ms_ res 1 ' 100ms
_500ms_ res 1 ' 500ms
_pulse_time_ res 1 ' Activity LED toggle interval, one sec connect wait, _500ms_ when connected
_frame1ms_clks_ res 1 '_1ms +/- n clocks: calculated based on the current sysclock
'------------------------------------------------------------------------------
_usb_h_ls_nco_ res 1 ' USB smart pin modes dependent on sysclock
_usb_d_ls_nco_ res 1
_usb_h_fs_nco_ res 1
_usb_d_fs_nco_ res 1
'------------------------------------------------------------------------------
' Scratch registers
htmp res 1 ' Scratch registers whose context remains within the same code block
htmp1 res 1
htmp2 res 1
htmp3 res 1
hrep res 1 ' Repeat count
hsave0 res 1 ' Subroutine parameter saves
hsave1 res 1
hsave2 res 1
isrtmp1 res 1
pkt_tmp res 1 ' Tmp storage for routines that deal with datax packets
hr0 res 1 ' Multi-purpose registers
hr1 res 1
hr2 res 1
hr3 res 1
hpar1 res 1 ' Routine entry/exit parameters
hpar2 res 1
hpar3 res 1
hct2 res 1 ' Function response bus turn-around timer
hct3 res 1 ' Keyboard/mouse poll timer
mod_cnt res 1 ' Used in idle loops
fit $1F0