js50.asm

USB大全电子版全部资料3~包含源码、协议等

;***********************************************************************
;				Cypress Semiconductor
; 			Joystick Demonstration Design Kit Firmware 
;
; Features :
; Four Fire Buttons
; Four Hat Buttons
; X, Y, Z movement
; Throttle
; Passes Chapter 9 and Hidview Tests 
; Includes Suspend/Resume Feature
;
; This firmware file is for demonstration purposes only.  
; Cypress Semiconductor will not assume any liability for its use.
; 
;=======================================================================
; 1/20/98	wmh	v5.0 Minor changes in One_msec_ISR
;=======================================================================
; 12/10/97	wmh	v4.9 Minor changes in One_msec_ISR, main and Reset
; Watchdog timer reset in main.
;=======================================================================
; 10/27/97	wmh	v4.8	Change in One_msec_ISR
; Code Naks whenever the joystick is not moved.
; Code also Naks after enumeration for a period approx. 230msec
; This solves blue screen problem when the power is turned off then on
;=======================================================================
; 10/13/97	wmh	v4.6	Change in USB_EP0_ISR
; SetConfiguration request was changed so as to enable endpoint 1
; GetReport is stalled
; GetReportDescriptor sends HID Report Descriptor
;=======================================================================
; 9/8/97	wmh 	v4.5 	Joystick Jitter Solved
; Jitter Solution added to GPIO_ISR 
;=======================================================================
; 8/13/97	wmh 	v4.3 	Report Descriptor Change
; Solves unusual jump in joystick movement
;=======================================================================
; 8/11/97	wmh 	v4.2	ipret change
; changed ret to ipret whenever needed in all subroutines
;=======================================================================
; 8/8/97	wmh	v4.0	One_msec and GPIO ISR changes
; Changes to prevent Endpoint_1 from interrupting capacitor charging
; to prevent jitter effect
;========================================================================
; 8/8/97	wmh 	v3.9	change in Report Descriptor
; Logical and Physical Min and Max have been changed to 3 bytes if > 127
; Other changes were also done
;========================================================================
; 7/3/97	wmh	v3.7 add features
; Suspend/Resume features have been added
; Main work done in the One_mSec_ISR
;========================================================================
; 6/30/97	wmh	v3.6 add features
; changes to allow the code to pass chapter 9 and hidview tests have been
; done.  That meant major rework of the endpoint zero interrupt service
; routine (USB_EP0_ISR).
;=======================================================
; rev 3.5	4/17/97 gwg
; Changed the interrupt mask from a constant to a variable.
; This allows us to enable only the one msec timer and
; EP0 during enumeration.
;
; Tim Williams found a problem with the hat buttons.  I
; forgot the buttons were in the upper nibble.
;=======================================================
; rev 3.4	4/15/97 gwg	664 bytes
; 1. The endpoint one ISR only toggles the Data 0/1 bit
;    now.
; 2. Every four msec, the one msec ISR writes to the
;    USB_EP1_TX_Config register to enable response to IN
;    packets from the host.
; 3. Write measured data directly into the endpoint one 
;    dma buffer.
; 4. Code compatible with revision 2 and 3 silicon.
;=======================================================
; rev 3.3       4/11/97 gwg
; modified for IPRET instruction in an effort to improve
; the runtime.
;=======================================================
; rev 3.2       4/11/97 gwg
; Tim Williams found a bug in the GPIO_ISR that prevented
; the code from working in the chip.  There was not enough
; time allowed to discharge the timing capacitors before
; interrupts were enabled.
;=======================================================
; rev 3.1       4/8/97  gwg
; Replaced Send_Buffer macro with a subroutine.
;=======================================================
; rev 3.0       4/8/97  gwg
; reworked the code to support the hat buttons and up to
; four analog channels.  The analog channels are sampled
; one per msec.  With a channel sample rate of 250 hz, 
; each channel should have a bandwidth of 125 hz - good.
; 
; The buttons are sampled in the main loop at a much
; higher rate.  
;
; The Send_Buffer macro remains a code size problem as
; the result to date is 40 bytes over 2 kilobytes.
;=======================================================
; rev 2.1       3/29/97 gwg
; reworked the code to eliminate string indices in the
; descriptors.  We don't have any strings.  Also fixed
; an error in the HID length (114 => 116 bytes)
;=======================================================
; drastic rework of js63fa.asm on 3/25 by gwg
;*******************************************************
;  This version of code supports the joystick function
;  and four buttons.
;*******************************************************
; 1. Eliminated the "scaling" feature that tried to 
;    ensure the joystick returned full-range readings.
; 2. Converted the analog measurement sections into two
;    subroutines.
; 3. Fixed several interrupt enable and stack problems
;    with the USB interrupt service routines.
; 4. Initialized the part to work correctly in a joystick:
;       - program pullup registers
;       - program Isink registers
; 5. Enabled the one msec interrupt handler to clear the
;    watchdog.
; 6. Patched the USB EP0 ISR to set the BadOuts bit to
;    accomodate changes in the chip definition.
; 7. Rewrote the USB interrupt handlers for better flow
;    and to remove redundant load instructions.
; 8. Commented the code to describe how it works. 
;*******************************************************
;               Suggested Changes
;-------------------------------------------------------
; 1. Convert the Send_Buffer macro to a subroutine to
;    reduce the code size.  The current version is 2 KB
;    plus 22 bytes.
; 2. Add hat support as either:
;       - third analog channel (software only)
;       - four buttons (rework hardware)
; 3. Add throttle support as another analog channel.
;    Consolidate the measure subroutines into one routine
;    that can process a selectable channel.
;*******************************************************
;               Suggestions for the Assembler
;-------------------------------------------------------
; 1. The assembler should be able to assign variable
;    addresses automatically.  One method is the concept
;    of segments: "data" and "code".  An ORG directive
;    would include a parameter to indicate which type of
;    segment was intended.  Then DB, DW, etc. would
;    allocate variable space and automatically assign 
;    the addresses.
; 2. We need a linker that allows us to write modular
;    code and link modules together.   
; 3. Conditional assembly directives would be useful to
;    write common code to support multiple parts.
;*******************************************************

;**************** assembler directives ***************** 

label:          XPAGEON

; I/O ports
Port0_Data:            equ     00h      ; GPIO data port 0
Port1_Data:            equ     01h      ; GPIO data port 1
Port0_Interrupt:       equ     04h      ; Interrupt enable for port 0
Port1_Interrupt:       equ     05h      ; Interrupt enable for port 1
Port0_Pullup:          equ     08h      ; Pullup resistor control for port 0
Port1_Pullup:          equ     09h      ; Pullup resistor control for port 1

; USB ports
USB_EP0_TX_Config:      equ     10h     ; USB EP0 transmit configuration
USB_EP1_TX_Config:      equ     11h     ; USB EP1 transmit configuration
USB_Device_Address:     equ     12h     ; USB device address assigned by host
USB_Status_Control:     equ     13h     ; USB status and control register
USB_EP0_RX_Status:      equ     14h     ; USB EP0 receive status

; control ports
Global_Interrupt:       equ     20h     ; Global interrupt enable
Watchdog:               equ     21h     ; clear watchdog Timer
Timer:                  equ     23h     ; free-running Timer

; GPIO Isink registers
Port0_Isink:            equ     30h
Port0_Isink0:           equ     30h
Port0_Isink1:           equ     31h
Port0_Isink2:           equ     32h
Port0_Isink3:           equ     33h
Port0_Isink4:           equ     34h
Port0_Isink5:           equ     35h
Port0_Isink6:           equ     36h
Port0_Isink7:           equ     37h

Port1_Isink:            equ     38h
Port1_Isink0:           equ     38h
Port1_Isink1:           equ     39h
Port1_Isink2:           equ     3Ah
Port1_Isink3:           equ     3Bh

; control port
Status_Control:         equ     FFh

; constants - gwg
BUTTON_MASK:            equ     0Fh     ; button bits
HAT_MASK:               equ     F0h     ; hat bits
FORWARD:                equ     1       ; hat forward
RIGHT:                  equ     3       ; hat right
BACK:                   equ     5       ; hat back
LEFT:                   equ     7       ; hat left
;**********  Register constants  ************************************
; Processor Status and Control
RunBit:			equ	 1h	; CPU Run bit
USBReset:			equ	20h	; USB Bus Reset bit
WatchDogReset:		equ	40h	; Watchdog Reset bit

; interrupt masks
TIMER_ONLY:			equ	 4h	; one msec timer

ENUMERATE_MASK:		equ	0Ch	; one msec timer 	
						; USB EP0 interrupt

RUNTIME_MASK:		equ     5Ch     	; one msec timer
							; USB EP0 interrupt
							; USB EP1 interrupt
							; GPIO interrupt
; USB EP1 transmit configuration
DataToggle:			equ	40h	; Data 0/1 bit

;========================================================================
; constant declarations
;========================================================================
; from USB Spec v1.0 from page 175
;------------------------------------------------------------------------
; standard request codes
get_status:             equ   0
clear_feature:          equ   1
set_feature:            equ   3
set_address:            equ   5
get_descriptor:         equ   6
set_descriptor:         equ   7
get_configuration:      equ   8
set_configuration:      equ   9
get_interface:          equ  10 
set_interface:          equ  11 
synch_frame:            equ  12

; standard descriptor types
device:         	equ  1
configuration:  	equ  2
string:         	equ  3
interface:      	equ  4
endpoint:       	equ  5

; standard feature selectors
endpoint_stalled:       equ  0		; recipient endpoint
device_remote_wakeup:   equ  1		; recipient device
 
;========================================================================
; from HID Class v1.0 Draft #4
;------------------------------------------------------------------------
; class specific descriptor types from section 7.1 Standard Requests
HID:                    equ  21h
report:                 equ  22h
physical:               equ  23h
  
; class specific request codes from section 7.2 Class Specific Requests
get_report:             equ   1
get_idle:               equ   2
get_protocol:           equ   3
set_report:             equ   9
set_idle:               equ  10
set_protocol:           equ  11

;========================================================================
; USB packet constants (debug purposes)
;------------------------------------------------------------------------
setup:          	equ  B4h
in:             	equ  96h
out:            	equ  87h
data0:          	equ  C3h
data1:          	equ  D2h
ack:            	equ  4Bh
nak:            	equ  5Ah

DISABLE_REMOTE_WAKEUP:  equ   0         ; bit[1] = 0
ENABLE_REMOTE_WAKEUP:   equ   2         ; bit[1] = 1

;========================================================================
; data variable assignments
;========================================================================

; control endpoint 0 fifo
endpoint_0:             equ  70h	; control endpoint

; definitions for SETUP packets
bmRequestType:          equ  70h
bRequest:               equ  71h
wValue:                 equ  72h        ; default wValue (8-bits)
wValueHi:               equ  73h
wIndex:                 equ  74h        ; default wIndex (8-bits)
wIndexHi:               equ  75h
wLength:                equ  76h        ; default wLength (8-bits)
wLengthHi:              equ  77h
 

; data memory variables
;------------------------------------------------------------------------
; To support the USB specification.
remote_wakeup_status:   equ  30h       	; remote wakeup request
							; zero is disabled
							; two is enabled
configuration_status:   equ  31h        	; configuration status
							; zero is unconfigured
							; one is configured
;idle_status:           equ  33h        	; support SetIdle and GetIdle
protocol_status:      	equ  34h        	; zero is boot protocol
							; one is report protocol
suspend_counter:		equ 35h		; contains number of idle bus msecs 
jitter_temp:		equ 36h	
loop_temp:			equ 37h
start_send:			equ 38h
X_Value_old:                equ  39h        
Y_Value_old:                equ  40h        
Z_Value_old:                equ  41h        
hat_bits_old:               equ  42h        
button_bits_old:            equ  43h        
Throttle_old:               equ  44h        

	
;------------------------------------------------------------------------

; variable allocations
temp:                   equ  25h
start_time:             equ  21h
testbit:                equ  22h
interrupt_mask:		equ  20h
endp0_data_toggle: 	equ  23h
loop_counter:		equ  24h
data_start:			equ  27h
data_count:			equ  28h
endpoint_stall:		equ  29h

; interrupt endpoint 1 fifo
endpoint_1:             equ  78h
X_Value:                equ  78h        ; Port 1 bit 0
Y_Value:                equ  79h        ; Port 1 bit 1
Z_Value:                equ  7Ah        ; Port 1 bit 3
hat_bits:               equ  7Bh        ; Port 0 bits 7:4
button_bits:            equ  7Ch        ; Port 0 bits 3:0
Throttle:               equ  7Dh        ; Port 1 bit 2

;*************** interrupt vector table ****************
; begin execution here after a reset
org  00h                ; Reset vector
jmp  Reset

org  02h                ; 128us interrupt
jmp  DoNothing_ISR

org  04h                ; 1024ms interrupt 
jmp  One_mSec_ISR

org  06h                ; endpoint 0 interrupt 
jmp  USB_EP0_ISR

org  08h                ; endpoint 1 interrupt 
jmp  USB_EP1_ISR

org  0Ah                ; reserved interrupt 
jmp  Reset

org  0Ch                ; general purpose I/O interrupt 
jmp  GPIO_ISR           ; not used

org  0Eh                ; Wakeup_ISR or resume interrupt 
jmp  DoNothing_ISR      ; not used


ORG  10h
;************************************************************************
; The 128 uSec, Cext, is not used by the joystick
 code.
; If this interrupt occurs, the software should do nothing
; except re-enable the interrupts.
DoNothing_ISR:
	push A                  ; save accumulator on stack
	mov A,[interrupt_mask]