You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
394 lines
11 KiB
ArmAsm
394 lines
11 KiB
ArmAsm
14 years ago
|
/* Name: usbdrvasm.S
|
||
|
|
* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
|
||
|
|
* Author: Christian Starkjohann
|
||
|
|
* Creation Date: 2007-06-13
|
||
|
|
* Tabsize: 4
|
||
|
|
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
|
||
|
|
* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
|
||
|
|
* Revision: $Id: usbdrvasm.S 785 2010-05-30 17:57:07Z cs $
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
General Description:
|
||
|
|
This module is the assembler part of the USB driver. This file contains
|
||
|
|
general code (preprocessor acrobatics and CRC computation) and then includes
|
||
|
|
the file appropriate for the given clock rate.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define __SFR_OFFSET 0 /* used by avr-libc's register definitions */
|
||
|
|
#include "usbportability.h"
|
||
|
|
#include "usbdrv.h" /* for common defs */
|
||
|
|
|
||
|
|
/* register names */
|
||
|
|
#define x1 r16
|
||
|
|
#define x2 r17
|
||
|
|
#define shift r18
|
||
|
|
#define cnt r19
|
||
|
|
#define x3 r20
|
||
|
|
#define x4 r21
|
||
|
|
#define x5 r22
|
||
|
|
#define bitcnt x5
|
||
|
|
#define phase x4
|
||
|
|
#define leap x4
|
||
|
|
|
||
|
|
/* Some assembler dependent definitions and declarations: */
|
||
|
|
|
||
|
|
#ifdef __IAR_SYSTEMS_ASM__
|
||
|
|
extern usbRxBuf, usbDeviceAddr, usbNewDeviceAddr, usbInputBufOffset
|
||
|
|
extern usbCurrentTok, usbRxLen, usbRxToken, usbTxLen
|
||
|
|
extern usbTxBuf, usbTxStatus1, usbTxStatus3
|
||
|
|
# if USB_COUNT_SOF
|
||
|
|
extern usbSofCount
|
||
|
|
# endif
|
||
|
|
public usbCrc16
|
||
|
|
public usbCrc16Append
|
||
|
|
|
||
|
|
COMMON INTVEC
|
||
|
|
# ifndef USB_INTR_VECTOR
|
||
|
|
ORG INT0_vect
|
||
|
|
# else /* USB_INTR_VECTOR */
|
||
|
|
ORG USB_INTR_VECTOR
|
||
|
|
# undef USB_INTR_VECTOR
|
||
|
|
# endif /* USB_INTR_VECTOR */
|
||
|
|
# define USB_INTR_VECTOR usbInterruptHandler
|
||
|
|
rjmp USB_INTR_VECTOR
|
||
|
|
RSEG CODE
|
||
|
|
|
||
|
|
#else /* __IAR_SYSTEMS_ASM__ */
|
||
|
|
|
||
|
|
# ifndef USB_INTR_VECTOR /* default to hardware interrupt INT0 */
|
||
|
|
# ifdef INT0_vect
|
||
|
|
# define USB_INTR_VECTOR INT0_vect // this is the "new" define for the vector
|
||
|
|
# else
|
||
|
|
# define USB_INTR_VECTOR SIG_INTERRUPT0 // this is the "old" vector
|
||
|
|
# endif
|
||
|
|
# endif
|
||
|
|
.text
|
||
|
|
.global USB_INTR_VECTOR
|
||
|
|
.type USB_INTR_VECTOR, @function
|
||
|
|
.global usbCrc16
|
||
|
|
.global usbCrc16Append
|
||
|
|
#endif /* __IAR_SYSTEMS_ASM__ */
|
||
|
|
|
||
|
|
|
||
|
|
#if USB_INTR_PENDING < 0x40 /* This is an I/O address, use in and out */
|
||
|
|
# define USB_LOAD_PENDING(reg) in reg, USB_INTR_PENDING
|
||
|
|
# define USB_STORE_PENDING(reg) out USB_INTR_PENDING, reg
|
||
|
|
#else /* It's a memory address, use lds and sts */
|
||
|
|
# define USB_LOAD_PENDING(reg) lds reg, USB_INTR_PENDING
|
||
|
|
# define USB_STORE_PENDING(reg) sts USB_INTR_PENDING, reg
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define usbTxLen1 usbTxStatus1
|
||
|
|
#define usbTxBuf1 (usbTxStatus1 + 1)
|
||
|
|
#define usbTxLen3 usbTxStatus3
|
||
|
|
#define usbTxBuf3 (usbTxStatus3 + 1)
|
||
|
|
|
||
|
|
|
||
|
|
;----------------------------------------------------------------------------
|
||
|
|
; Utility functions
|
||
|
|
;----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
#ifdef __IAR_SYSTEMS_ASM__
|
||
|
|
/* Register assignments for usbCrc16 on IAR cc */
|
||
|
|
/* Calling conventions on IAR:
|
||
|
|
* First parameter passed in r16/r17, second in r18/r19 and so on.
|
||
|
|
* Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer)
|
||
|
|
* Result is passed in r16/r17
|
||
|
|
* In case of the "tiny" memory model, pointers are only 8 bit with no
|
||
|
|
* padding. We therefore pass argument 1 as "16 bit unsigned".
|
||
|
|
*/
|
||
|
|
RTMODEL "__rt_version", "3"
|
||
|
|
/* The line above will generate an error if cc calling conventions change.
|
||
|
|
* The value "3" above is valid for IAR 4.10B/W32
|
||
|
|
*/
|
||
|
|
# define argLen r18 /* argument 2 */
|
||
|
|
# define argPtrL r16 /* argument 1 */
|
||
|
|
# define argPtrH r17 /* argument 1 */
|
||
|
|
|
||
|
|
# define resCrcL r16 /* result */
|
||
|
|
# define resCrcH r17 /* result */
|
||
|
|
|
||
|
|
# define ptrL ZL
|
||
|
|
# define ptrH ZH
|
||
|
|
# define ptr Z
|
||
|
|
# define byte r22
|
||
|
|
# define bitCnt r19
|
||
|
|
# define polyL r20
|
||
|
|
# define polyH r21
|
||
|
|
# define scratch r23
|
||
|
|
|
||
|
|
#else /* __IAR_SYSTEMS_ASM__ */
|
||
|
|
/* Register assignments for usbCrc16 on gcc */
|
||
|
|
/* Calling conventions on gcc:
|
||
|
|
* First parameter passed in r24/r25, second in r22/23 and so on.
|
||
|
|
* Callee must preserve r1-r17, r28/r29
|
||
|
|
* Result is passed in r24/r25
|
||
|
|
*/
|
||
|
|
# define argLen r22 /* argument 2 */
|
||
|
|
# define argPtrL r24 /* argument 1 */
|
||
|
|
# define argPtrH r25 /* argument 1 */
|
||
|
|
|
||
|
|
# define resCrcL r24 /* result */
|
||
|
|
# define resCrcH r25 /* result */
|
||
|
|
|
||
|
|
# define ptrL XL
|
||
|
|
# define ptrH XH
|
||
|
|
# define ptr x
|
||
|
|
# define byte r18
|
||
|
|
# define bitCnt r19
|
||
|
|
# define polyL r20
|
||
|
|
# define polyH r21
|
||
|
|
# define scratch r23
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if USB_USE_FAST_CRC
|
||
|
|
|
||
|
|
; This implementation is faster, but has bigger code size
|
||
|
|
; Thanks to Slawomir Fras (BoskiDialer) for this code!
|
||
|
|
; It implements the following C pseudo-code:
|
||
|
|
; unsigned table(unsigned char x)
|
||
|
|
; {
|
||
|
|
; unsigned value;
|
||
|
|
;
|
||
|
|
; value = (unsigned)x << 6;
|
||
|
|
; value ^= (unsigned)x << 7;
|
||
|
|
; if(parity(x))
|
||
|
|
; value ^= 0xc001;
|
||
|
|
; return value;
|
||
|
|
; }
|
||
|
|
; unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen)
|
||
|
|
; {
|
||
|
|
; unsigned crc = 0xffff;
|
||
|
|
;
|
||
|
|
; while(argLen--)
|
||
|
|
; crc = table(lo8(crc) ^ *argPtr++) ^ hi8(crc);
|
||
|
|
; return ~crc;
|
||
|
|
; }
|
||
|
|
|
||
|
|
; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen);
|
||
|
|
; argPtr r24+25 / r16+r17
|
||
|
|
; argLen r22 / r18
|
||
|
|
; temp variables:
|
||
|
|
; byte r18 / r22
|
||
|
|
; scratch r23
|
||
|
|
; resCrc r24+r25 / r16+r17
|
||
|
|
; ptr X / Z
|
||
|
|
usbCrc16:
|
||
|
|
mov ptrL, argPtrL
|
||
|
|
mov ptrH, argPtrH
|
||
|
|
ldi resCrcL, 0xFF
|
||
|
|
ldi resCrcH, 0xFF
|
||
|
|
rjmp usbCrc16LoopTest
|
||
|
|
usbCrc16ByteLoop:
|
||
|
|
ld byte, ptr+
|
||
|
|
eor resCrcL, byte ; resCrcL is now 'x' in table()
|
||
|
|
mov byte, resCrcL ; compute parity of 'x'
|
||
|
|
swap byte
|
||
|
|
eor byte, resCrcL
|
||
|
|
mov scratch, byte
|
||
|
|
lsr byte
|
||
|
|
lsr byte
|
||
|
|
eor byte, scratch
|
||
|
|
inc byte
|
||
|
|
lsr byte
|
||
|
|
andi byte, 1 ; byte is now parity(x)
|
||
|
|
mov scratch, resCrcL
|
||
|
|
mov resCrcL, resCrcH
|
||
|
|
eor resCrcL, byte ; low byte of if(parity(x)) value ^= 0xc001;
|
||
|
|
neg byte
|
||
|
|
andi byte, 0xc0
|
||
|
|
mov resCrcH, byte ; high byte of if(parity(x)) value ^= 0xc001;
|
||
|
|
clr byte
|
||
|
|
lsr scratch
|
||
|
|
ror byte
|
||
|
|
eor resCrcH, scratch
|
||
|
|
eor resCrcL, byte
|
||
|
|
lsr scratch
|
||
|
|
ror byte
|
||
|
|
eor resCrcH, scratch
|
||
|
|
eor resCrcL, byte
|
||
|
|
usbCrc16LoopTest:
|
||
|
|
subi argLen, 1
|
||
|
|
brsh usbCrc16ByteLoop
|
||
|
|
com resCrcL
|
||
|
|
com resCrcH
|
||
|
|
ret
|
||
|
|
|
||
|
|
#else /* USB_USE_FAST_CRC */
|
||
|
|
|
||
|
|
; This implementation is slower, but has less code size
|
||
|
|
;
|
||
|
|
; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen);
|
||
|
|
; argPtr r24+25 / r16+r17
|
||
|
|
; argLen r22 / r18
|
||
|
|
; temp variables:
|
||
|
|
; byte r18 / r22
|
||
|
|
; bitCnt r19
|
||
|
|
; poly r20+r21
|
||
|
|
; scratch r23
|
||
|
|
; resCrc r24+r25 / r16+r17
|
||
|
|
; ptr X / Z
|
||
|
|
usbCrc16:
|
||
|
|
mov ptrL, argPtrL
|
||
|
|
mov ptrH, argPtrH
|
||
|
|
ldi resCrcL, 0
|
||
|
|
ldi resCrcH, 0
|
||
|
|
ldi polyL, lo8(0xa001)
|
||
|
|
ldi polyH, hi8(0xa001)
|
||
|
|
com argLen ; argLen = -argLen - 1: modified loop to ensure that carry is set
|
||
|
|
ldi bitCnt, 0 ; loop counter with starnd condition = end condition
|
||
|
|
rjmp usbCrcLoopEntry
|
||
|
|
usbCrcByteLoop:
|
||
|
|
ld byte, ptr+
|
||
|
|
eor resCrcL, byte
|
||
|
|
usbCrcBitLoop:
|
||
|
|
ror resCrcH ; carry is always set here (see brcs jumps to here)
|
||
|
|
ror resCrcL
|
||
|
|
brcs usbCrcNoXor
|
||
|
|
eor resCrcL, polyL
|
||
|
|
eor resCrcH, polyH
|
||
|
|
usbCrcNoXor:
|
||
|
|
subi bitCnt, 224 ; (8 * 224) % 256 = 0; this loop iterates 8 times
|
||
|
|
brcs usbCrcBitLoop
|
||
|
|
usbCrcLoopEntry:
|
||
|
|
subi argLen, -1
|
||
|
|
brcs usbCrcByteLoop
|
||
|
|
usbCrcReady:
|
||
|
|
ret
|
||
|
|
; Thanks to Reimar Doeffinger for optimizing this CRC routine!
|
||
|
|
|
||
|
|
#endif /* USB_USE_FAST_CRC */
|
||
|
|
|
||
|
|
; extern unsigned usbCrc16Append(unsigned char *data, unsigned char len);
|
||
|
|
usbCrc16Append:
|
||
|
|
rcall usbCrc16
|
||
|
|
st ptr+, resCrcL
|
||
|
|
st ptr+, resCrcH
|
||
|
|
ret
|
||
|
|
|
||
|
|
#undef argLen
|
||
|
|
#undef argPtrL
|
||
|
|
#undef argPtrH
|
||
|
|
#undef resCrcL
|
||
|
|
#undef resCrcH
|
||
|
|
#undef ptrL
|
||
|
|
#undef ptrH
|
||
|
|
#undef ptr
|
||
|
|
#undef byte
|
||
|
|
#undef bitCnt
|
||
|
|
#undef polyL
|
||
|
|
#undef polyH
|
||
|
|
#undef scratch
|
||
|
|
|
||
|
|
|
||
|
|
#if USB_CFG_HAVE_MEASURE_FRAME_LENGTH
|
||
|
|
#ifdef __IAR_SYSTEMS_ASM__
|
||
|
|
/* Register assignments for usbMeasureFrameLength on IAR cc */
|
||
|
|
/* Calling conventions on IAR:
|
||
|
|
* First parameter passed in r16/r17, second in r18/r19 and so on.
|
||
|
|
* Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer)
|
||
|
|
* Result is passed in r16/r17
|
||
|
|
* In case of the "tiny" memory model, pointers are only 8 bit with no
|
||
|
|
* padding. We therefore pass argument 1 as "16 bit unsigned".
|
||
|
|
*/
|
||
|
|
# define resL r16
|
||
|
|
# define resH r17
|
||
|
|
# define cnt16L r30
|
||
|
|
# define cnt16H r31
|
||
|
|
# define cntH r18
|
||
|
|
|
||
|
|
#else /* __IAR_SYSTEMS_ASM__ */
|
||
|
|
/* Register assignments for usbMeasureFrameLength on gcc */
|
||
|
|
/* Calling conventions on gcc:
|
||
|
|
* First parameter passed in r24/r25, second in r22/23 and so on.
|
||
|
|
* Callee must preserve r1-r17, r28/r29
|
||
|
|
* Result is passed in r24/r25
|
||
|
|
*/
|
||
|
|
# define resL r24
|
||
|
|
# define resH r25
|
||
|
|
# define cnt16L r24
|
||
|
|
# define cnt16H r25
|
||
|
|
# define cntH r26
|
||
|
|
#endif
|
||
|
|
# define cnt16 cnt16L
|
||
|
|
|
||
|
|
; extern unsigned usbMeasurePacketLength(void);
|
||
|
|
; returns time between two idle strobes in multiples of 7 CPU clocks
|
||
|
|
.global usbMeasureFrameLength
|
||
|
|
usbMeasureFrameLength:
|
||
|
|
ldi cntH, 6 ; wait ~ 10 ms for D- == 0
|
||
|
|
clr cnt16L
|
||
|
|
clr cnt16H
|
||
|
|
usbMFTime16:
|
||
|
|
dec cntH
|
||
|
|
breq usbMFTimeout
|
||
|
|
usbMFWaitStrobe: ; first wait for D- == 0 (idle strobe)
|
||
|
|
sbiw cnt16, 1 ;[0] [6]
|
||
|
|
breq usbMFTime16 ;[2]
|
||
|
|
sbic USBIN, USBMINUS ;[3]
|
||
|
|
rjmp usbMFWaitStrobe ;[4]
|
||
|
|
usbMFWaitIdle: ; then wait until idle again
|
||
|
|
sbis USBIN, USBMINUS ;1 wait for D- == 1
|
||
|
|
rjmp usbMFWaitIdle ;2
|
||
|
|
ldi cnt16L, 1 ;1 represents cycles so far
|
||
|
|
clr cnt16H ;1
|
||
|
|
usbMFWaitLoop:
|
||
|
|
in cntH, USBIN ;[0] [7]
|
||
|
|
adiw cnt16, 1 ;[1]
|
||
|
|
breq usbMFTimeout ;[3]
|
||
|
|
andi cntH, USBMASK ;[4]
|
||
|
|
brne usbMFWaitLoop ;[5]
|
||
|
|
usbMFTimeout:
|
||
|
|
#if resL != cnt16L
|
||
|
|
mov resL, cnt16L
|
||
|
|
mov resH, cnt16H
|
||
|
|
#endif
|
||
|
|
ret
|
||
|
|
|
||
|
|
#undef resL
|
||
|
|
#undef resH
|
||
|
|
#undef cnt16
|
||
|
|
#undef cnt16L
|
||
|
|
#undef cnt16H
|
||
|
|
#undef cntH
|
||
|
|
|
||
|
|
#endif /* USB_CFG_HAVE_MEASURE_FRAME_LENGTH */
|
||
|
|
|
||
|
|
;----------------------------------------------------------------------------
|
||
|
|
; Now include the clock rate specific code
|
||
|
|
;----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
#ifndef USB_CFG_CLOCK_KHZ
|
||
|
|
# ifdef F_CPU
|
||
|
|
# define USB_CFG_CLOCK_KHZ (F_CPU/1000)
|
||
|
|
# else
|
||
|
|
# error "USB_CFG_CLOCK_KHZ not defined in usbconfig.h and no F_CPU set!"
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if USB_CFG_CHECK_CRC /* separate dispatcher for CRC type modules */
|
||
|
|
# if USB_CFG_CLOCK_KHZ == 18000
|
||
|
|
# include "usbdrvasm18-crc.inc"
|
||
|
|
# else
|
||
|
|
# error "USB_CFG_CLOCK_KHZ is not one of the supported crc-rates!"
|
||
|
|
# endif
|
||
|
|
#else /* USB_CFG_CHECK_CRC */
|
||
|
|
# if USB_CFG_CLOCK_KHZ == 12000
|
||
|
|
# include "usbdrvasm12.inc"
|
||
|
|
# elif USB_CFG_CLOCK_KHZ == 12800
|
||
|
|
# include "usbdrvasm128.inc"
|
||
|
|
# elif USB_CFG_CLOCK_KHZ == 15000
|
||
|
|
# include "usbdrvasm15.inc"
|
||
|
|
# elif USB_CFG_CLOCK_KHZ == 16000
|
||
|
|
# include "usbdrvasm16.inc"
|
||
|
|
# elif USB_CFG_CLOCK_KHZ == 16500
|
||
|
|
# include "usbdrvasm165.inc"
|
||
|
|
# elif USB_CFG_CLOCK_KHZ == 20000
|
||
|
|
# include "usbdrvasm20.inc"
|
||
|
|
# else
|
||
|
|
# error "USB_CFG_CLOCK_KHZ is not one of the supported non-crc-rates!"
|
||
|
|
# endif
|
||
|
|
#endif /* USB_CFG_CHECK_CRC */
|