📄 usbps2.lst
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0049 ;------------------------------------------------------------------------
0049 ; To support the USB specification.
0049 remote_wakeup_status: equ usbmain_ram_base
0049 ; remote wakeup request
0049 ; zero is disabled
0049 ; two is enabled
0049 configuration_status: equ (usbmain_ram_base+1)
0049 ; configuration status
0049 ; zero is unconfigured
0049 ; one is configured
0049 ep1_stall_status: equ (usbmain_ram_base+2) ; zero is not stalled
0049 ep2_stall_status: equ (usbmain_ram_base+3) ; one is stalled
0049
0049 protocol_status: equ (usbmain_ram_base+4) ; zero is boot protocol
0049 ; one is report protocol
0049 ; support SetIdle and GetIdle
0049 kbd_idle_period: equ (usbmain_ram_base+5) ; keyboard idle period
0049 kbd_idle_period_ctr: equ (usbmain_ram_base+6) ; keyboard idle period
0049 mouse_idle_period: equ (usbmain_ram_base+7) ; mouse idle period
0049 mouse_idle_period_ctr: equ (usbmain_ram_base+8) ; mouse idle period
0049 consumer_idle_period: equ (usbmain_ram_base+9) ; consumer keys idle period
0049 consumer_idle_period_ctr:equ (usbmain_ram_base+10) ; consumer keys idle period
0049 power_idle_period: equ (usbmain_ram_base+11) ; power idle period
0049 power_idle_period_ctr: equ (usbmain_ram_base+12) ; power idle period
0049
0049 1ms_counter: equ (usbmain_ram_base+13) ; 4ms counter
0049 data_start: equ (usbmain_ram_base+14) ; points to start of descriptor
0049 data_count: equ (usbmain_ram_base+15) ; current length of descriptor
0049 byte_count: equ (usbmain_ram_base+16) ; current size of transmission
0049 temp: equ (usbmain_ram_base+17)
0049
0049 ;--------------------------------------------------------------------------
0049 suspend_counter: equ (usbmain_ram_base+18) ; contains number of idle bus msecs
0049
0049
0049 ;------------------------------------------------------------------------
0049 ; application support
0049 ;------------------------------------------------------------------------
0049
0049
0049 page: equ (usbmain_ram_base+19) ; page location of descriptor(RAM,
0049 ; ROM page 1, ROM page 2
0049 EP0_mode_shadow: equ (usbmain_ram_base+20) ; variable to store ep0 mode
0049 ; used by set_ep0_mode
0049
0049 ps2_tmp: equ (usbmain_ram_base+21) ; temporary variable for port 3 write by PS/2
0049 background_flags: equ (usbmain_ram_base+22) ; signal flags for background
0049 usb_leds: equ (usbmain_ram_base+23) ; overcurrent debounce counter
0049 last_key_report: equ (usbmain_ram_base+24)
0049 EP0_fifo_shadow: equ (usbmain_ram_base+25)
0049 EP_A0_counter_shadow: equ (usbmain_ram_base+26)
0049 EP0_Next_Mode: equ (usbmain_ram_base+27)
0049 EP0_FLAG: equ (usbmain_ram_base+28)
0049 USBMAIN_RAM_SIZE: equ 29
0049
0049 SUSPEND_FLAG: equ 1
0049 SCAN_FLAG: equ 2
0049 ;========================================================================
0049 ; program listing
0049 ;========================================================================
0049
0049
0049 ;========================================================================
0049 ; The 128 uSec interrupt is not used by the keyboard code. The keyboard
0049 ; only does not require the DAC or GPIO port in this version of
0049 ; firmware. It may be necessary to enable GPIO interrupts when the
0049 ; keyboard enters a power down suspend mode.
0049 DoNothing_ISR:
0049 73 [08] reti ; return from interrupt
004A
004A ;========================================================================
004A ; Suspend
004A ;
004A ; This routine is invoked from the main loop when bus activity has ceased for
004A ; 3 msec or more. This routine prepares the keyboard for suspension, suspends
004A ; the part, and restores the keyboard upon a subsequent resume.
004A ;========================================================================
004A ; Suspend
004A ;
004A ; This routine is invoked from the main loop when bus activity has ceased for
004A ; 3 msec or more. This routine prepares the keyboard for suspension, suspends
004A ; the part, and restores the keyboard upon a subsequent resume.
004A
004A Suspend:
004A
004A 2D [05] push A
004B ; (since all pins are guaranteed to not float)
004B
004B 5B 84 [10] call mouse_suspend ; put PS/2 mouse in stream mode
004D 70 [08] di ; disable interrupts
004E 19 FF [04] mov A, RESISTIVE_NEG ; all ports resistive neg so that
0050 2A 08 [05] iowr GPIO_Config ; we stay within suspend current budget (500uA)
0052 19 00 [04] mov A, 0 ; pull down the column lines
0054 2A 00 [05] iowr Port0_Data
0056 2A 01 [05] iowr Port1_Data
0058 1A 88 [06] mov A, [ksc_p3out]
005A 0D 07 [04] or A, P3_LED_MASK ; turn LEDs off
005C 10 3F [04] and A, ~P3_KEY_MASK ; don't touch bit 6 & 7 (PS/2 mouse interface)
005E 2A 03 [05] iowr Port3_Data
0060 19 FF [04] mov A, FFh
0062 2A 06 [05] iowr Port2_Interrupt ; enable port 2 GPIO interrupt for keyboard
0064 19 20 [04] mov A, GPIO_ONLY_MASK ; enable GPIO interrupt only
0066 2A 20 [05] iowr Global_Interrupt
0068 1A 22 [06] mov A, [remote_wakeup_status] ; is remote wakeup feature enabled?
006A 16 02 [04] cmp A, ENABLE_REMOTE_WAKEUP
006C B0 6F [05] jnz Suspend_controller
006E 72 [08] ei
006F Suspend_controller:
006F
006F 29 FF [05] iord Status_Control ; set the suspend bit causing suspend
0071 0D 08 [04] or A, 08h
0073 2A FF [05] iowr Status_Control ; we are suspended here
0075
0075 ; resume !!!!!!
0075 20 [04] nop ; execute a nop after resuming
0076
0076 70 [08] di
0077 2A 26 [05] iowr Watchdog
0079 29 1F [05] iord USB_Status_Control ; check if there is no bus activity
007B 10 08 [04] and A, 08h
007D 16 00 [04] cmp A, 00h
007F B0 B1 [05] jnz GPIO_disable_interrupts ; if there is bus activity,
0081 ; disable interrupts and exit
0081
0081
0081 19 04 [04] mov A, TIMER_ONLY_MASK ; enable 1ms interrupt
0083 2A 20 [05] iowr Global_Interrupt
0085 72 [08] ei
0086 1A 2F [06] mov A, [1ms_counter] ; clear wakeup counter
0088 01 05 [04] add A,5
008A
008A wakeup_delay: ; wait 5ms before we send the wakeup signal
008A 2A 26 [05] iowr Watchdog
008C 17 2F [06] cmp A, [1ms_counter]
008E B0 8A [05] jnz wakeup_delay
0090
0090 70 [08] di ; disable interrupts
0091
0091 29 1F [05] iord USB_Status_Control ; check again if there is no bus activity
0093 10 08 [04] and A, 08h ; after 5ms
0095 16 00 [04] cmp A, 00h
0097 B0 B1 [05] jnz GPIO_disable_interrupts ; if there is bus activity,
0099 ; disable interrupts and exit
0099
0099
0099 19 02 [04] mov A, FORCE_J ; force J state to correct cross-over voltage
009B 2A 1F [05] iowr USB_Status_Control ; problem during resume signalling
009D
009D 19 01 [04] mov A, FORCE_K ; start sending resume signal
009F 2A 1F [05] iowr USB_Status_Control
00A1
00A1 72 [08] ei ; enable 1ms interrupt again
00A2 1A 2F [06] mov A, [1ms_counter] ; clear wakeup counter
00A4 01 0A [04] add A,0ah
00A6
00A6 wakeup_duration: ; send resume signal for 10ms
00A6 2A 26 [05] iowr Watchdog
00A8 17 2F [06] cmp A, [1ms_counter]
00AA B0 A6 [05] jnz wakeup_duration
00AC
00AC 70 [08] di ; disable interrupts
00AD
00AD 19 00 [04] mov A, NOT_FORCING ; let SIE control D+/D-
00AF 2A 1F [05] iowr USB_Status_Control
00B1
00B1
00B1 GPIO_disable_interrupts: ;
00B1 ;interrupts are off when we get here
00B1 29 1F [05] iord USB_Status_Control
00B3 10 F7 [04] and A, F7h ; clear Bus Activity bit
00B5 2A 1F [05] iowr USB_Status_Control
00B7
00B7 19 00 [04] mov A, 0
00B9 2A 06 [05] iowr Port2_Interrupt ; disable GPIO interrupt for keyboard
00BB
00BB 19 25 [04] mov A, GPIO_TIMER_RESET_MASK ; enable GPIO and 1ms interrupts
00BD 2A 20 [05] iowr Global_Interrupt
00BF
00BF
00BF 72 [08] ei
00C0 5B 84 [10] call mouse_resume ; put PS/2 mouse into polling mode
00C2 70 [08] di
00C3 Skip_suspend:
00C3 19 F5 [04] mov A, NORMAL ; restore original GPIO configuration
00C5 2A 08 [05] iowr GPIO_Config
00C7 19 00 [04] mov A,0
00C9 31 34 [05] mov [suspend_counter],A
00CB 5A 4D [10] call ksc_restore_ports ; restore column ports to pre-suspend values
00CD 72 [08] ei
00CE 2B [04] pop A
00CF 3F [08] ret
00D0
00D0
00D0
00D0 check_activity:
00D0
00D0 29 1F [05] iord USB_Status_Control ; check if there is bus activity
00D2 10 08 [04] and A, 08h
00D4 3F [08] ret
00D5
00D5 ;========================================================================
00D5 ; The 1 msec interrupt is used to clear the watchdog timer, to maintain
00D5 ; all timers with a 1msec granularity
00D5 ;========================================================================
00D5
00D5 One_mSec_ISR:
00D5 23 2F [07] inc [1ms_counter] ;increment 1msec timer
00D7 1A 2F [06] mov A,[1ms_counter]
00D9 10 03 [04] and A,3
00DB
00DB B0 E3 [05] jnz check_bus_activity_status ;every 4 msec, do the following:
00DD
00DD 1A 38 [06] mov A,[background_flags] ; set the flag to scan the keyboard
00DF 0D 02 [04] or A,SCAN_FLAG
00E1 31 38 [05] mov [background_flags],A
00E3
00E3 check_bus_activity_status:
00E3 29 1F [05] iord USB_Status_Control ; check if there is no bus activity
00E5 10 08 [04] and A, 08h
00E7 16 00 [04] cmp A,0h
00E9 A0 F7 [05] jz Inc_counter ; if there was bus activity
00EB 29 1F [05] iord USB_Status_Control ; clear the bus activity bit
00ED 10 F7 [04] and A, 0F7h
00EF 2A 1F [05] iowr USB_Status_Control
00F1 19 00 [04] mov A, 0h ; clear the suspend counter
00F3 31 34 [05] mov [suspend_counter], A ;
00F5 81 06 [05] jmp Exit_1ms
00F7
00F7 Inc_counter: ;there was no bus activity,
00F7 23 34 [07] inc [suspend_counter] ;so increment the bus activity counter
00F9 1A 34 [06] mov A,[suspend_counter]
00FB 16 03 [04] cmp A, 03h ;if 3msecs of bus inactivity passed
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