[1fabcce] | 1 | /* Name: usbdrvasm.S
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| 2 | * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
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| 3 | * Author: Christian Starkjohann
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| 4 | * Creation Date: 2007-06-13
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| 5 | * Tabsize: 4
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| 6 | * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
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| 7 | * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
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| 8 | * Revision: $Id: usbdrvasm.S 785 2010-05-30 17:57:07Z cs $
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| 9 | */
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| 10 |
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| 11 | /*
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| 12 | General Description:
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| 13 | This module is the assembler part of the USB driver. This file contains
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| 14 | general code (preprocessor acrobatics and CRC computation) and then includes
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| 15 | the file appropriate for the given clock rate.
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| 16 | */
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| 17 |
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| 18 | #define __SFR_OFFSET 0 /* used by avr-libc's register definitions */
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| 19 | #include "usbportability.h"
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| 20 | #include "usbdrv.h" /* for common defs */
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| 21 |
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| 22 | /* register names */
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| 23 | #define x1 r16
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| 24 | #define x2 r17
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| 25 | #define shift r18
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| 26 | #define cnt r19
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| 27 | #define x3 r20
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| 28 | #define x4 r21
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| 29 | #define x5 r22
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| 30 | #define bitcnt x5
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| 31 | #define phase x4
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| 32 | #define leap x4
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| 33 |
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| 34 | /* Some assembler dependent definitions and declarations: */
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| 35 |
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| 36 | #ifdef __IAR_SYSTEMS_ASM__
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| 37 | extern usbRxBuf, usbDeviceAddr, usbNewDeviceAddr, usbInputBufOffset
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| 38 | extern usbCurrentTok, usbRxLen, usbRxToken, usbTxLen
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| 39 | extern usbTxBuf, usbTxStatus1, usbTxStatus3
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| 40 | # if USB_COUNT_SOF
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| 41 | extern usbSofCount
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| 42 | # endif
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| 43 | public usbCrc16
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| 44 | public usbCrc16Append
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| 45 |
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| 46 | COMMON INTVEC
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| 47 | # ifndef USB_INTR_VECTOR
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| 48 | ORG INT0_vect
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| 49 | # else /* USB_INTR_VECTOR */
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| 50 | ORG USB_INTR_VECTOR
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| 51 | # undef USB_INTR_VECTOR
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| 52 | # endif /* USB_INTR_VECTOR */
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| 53 | # define USB_INTR_VECTOR usbInterruptHandler
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| 54 | rjmp USB_INTR_VECTOR
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| 55 | RSEG CODE
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| 56 |
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| 57 | #else /* __IAR_SYSTEMS_ASM__ */
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| 58 |
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| 59 | # ifndef USB_INTR_VECTOR /* default to hardware interrupt INT0 */
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| 60 | # ifdef INT0_vect
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| 61 | # define USB_INTR_VECTOR INT0_vect // this is the "new" define for the vector
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| 62 | # else
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| 63 | # define USB_INTR_VECTOR SIG_INTERRUPT0 // this is the "old" vector
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| 64 | # endif
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| 65 | # endif
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| 66 | .text
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| 67 | .global USB_INTR_VECTOR
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| 68 | .type USB_INTR_VECTOR, @function
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| 69 | .global usbCrc16
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| 70 | .global usbCrc16Append
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| 71 | #endif /* __IAR_SYSTEMS_ASM__ */
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| 72 |
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| 73 |
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| 74 | #if USB_INTR_PENDING < 0x40 /* This is an I/O address, use in and out */
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| 75 | # define USB_LOAD_PENDING(reg) in reg, USB_INTR_PENDING
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| 76 | # define USB_STORE_PENDING(reg) out USB_INTR_PENDING, reg
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| 77 | #else /* It's a memory address, use lds and sts */
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| 78 | # define USB_LOAD_PENDING(reg) lds reg, USB_INTR_PENDING
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| 79 | # define USB_STORE_PENDING(reg) sts USB_INTR_PENDING, reg
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| 80 | #endif
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| 81 |
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| 82 | #define usbTxLen1 usbTxStatus1
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| 83 | #define usbTxBuf1 (usbTxStatus1 + 1)
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| 84 | #define usbTxLen3 usbTxStatus3
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| 85 | #define usbTxBuf3 (usbTxStatus3 + 1)
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| 86 |
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| 87 |
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| 88 | ;----------------------------------------------------------------------------
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| 89 | ; Utility functions
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| 90 | ;----------------------------------------------------------------------------
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| 91 |
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| 92 | #ifdef __IAR_SYSTEMS_ASM__
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| 93 | /* Register assignments for usbCrc16 on IAR cc */
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| 94 | /* Calling conventions on IAR:
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| 95 | * First parameter passed in r16/r17, second in r18/r19 and so on.
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| 96 | * Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer)
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| 97 | * Result is passed in r16/r17
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| 98 | * In case of the "tiny" memory model, pointers are only 8 bit with no
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| 99 | * padding. We therefore pass argument 1 as "16 bit unsigned".
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| 100 | */
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| 101 | RTMODEL "__rt_version", "3"
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| 102 | /* The line above will generate an error if cc calling conventions change.
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| 103 | * The value "3" above is valid for IAR 4.10B/W32
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| 104 | */
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| 105 | # define argLen r18 /* argument 2 */
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| 106 | # define argPtrL r16 /* argument 1 */
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| 107 | # define argPtrH r17 /* argument 1 */
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| 108 |
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| 109 | # define resCrcL r16 /* result */
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| 110 | # define resCrcH r17 /* result */
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| 111 |
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| 112 | # define ptrL ZL
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| 113 | # define ptrH ZH
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| 114 | # define ptr Z
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| 115 | # define byte r22
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| 116 | # define bitCnt r19
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| 117 | # define polyL r20
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| 118 | # define polyH r21
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| 119 | # define scratch r23
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| 120 |
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| 121 | #else /* __IAR_SYSTEMS_ASM__ */
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| 122 | /* Register assignments for usbCrc16 on gcc */
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| 123 | /* Calling conventions on gcc:
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| 124 | * First parameter passed in r24/r25, second in r22/23 and so on.
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| 125 | * Callee must preserve r1-r17, r28/r29
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| 126 | * Result is passed in r24/r25
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| 127 | */
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| 128 | # define argLen r22 /* argument 2 */
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| 129 | # define argPtrL r24 /* argument 1 */
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| 130 | # define argPtrH r25 /* argument 1 */
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| 131 |
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| 132 | # define resCrcL r24 /* result */
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| 133 | # define resCrcH r25 /* result */
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| 134 |
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| 135 | # define ptrL XL
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| 136 | # define ptrH XH
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| 137 | # define ptr x
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| 138 | # define byte r18
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| 139 | # define bitCnt r19
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| 140 | # define polyL r20
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| 141 | # define polyH r21
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| 142 | # define scratch r23
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| 143 |
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| 144 | #endif
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| 145 |
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| 146 | #if USB_USE_FAST_CRC
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| 147 |
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| 148 | ; This implementation is faster, but has bigger code size
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| 149 | ; Thanks to Slawomir Fras (BoskiDialer) for this code!
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| 150 | ; It implements the following C pseudo-code:
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| 151 | ; unsigned table(unsigned char x)
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| 152 | ; {
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| 153 | ; unsigned value;
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| 154 | ;
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| 155 | ; value = (unsigned)x << 6;
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| 156 | ; value ^= (unsigned)x << 7;
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| 157 | ; if(parity(x))
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| 158 | ; value ^= 0xc001;
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| 159 | ; return value;
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| 160 | ; }
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| 161 | ; unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen)
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| 162 | ; {
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| 163 | ; unsigned crc = 0xffff;
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| 164 | ;
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| 165 | ; while(argLen--)
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| 166 | ; crc = table(lo8(crc) ^ *argPtr++) ^ hi8(crc);
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| 167 | ; return ~crc;
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| 168 | ; }
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| 169 |
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| 170 | ; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen);
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| 171 | ; argPtr r24+25 / r16+r17
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| 172 | ; argLen r22 / r18
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| 173 | ; temp variables:
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| 174 | ; byte r18 / r22
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| 175 | ; scratch r23
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| 176 | ; resCrc r24+r25 / r16+r17
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| 177 | ; ptr X / Z
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| 178 | usbCrc16:
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| 179 | mov ptrL, argPtrL
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| 180 | mov ptrH, argPtrH
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| 181 | ldi resCrcL, 0xFF
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| 182 | ldi resCrcH, 0xFF
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| 183 | rjmp usbCrc16LoopTest
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| 184 | usbCrc16ByteLoop:
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| 185 | ld byte, ptr+
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| 186 | eor resCrcL, byte ; resCrcL is now 'x' in table()
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| 187 | mov byte, resCrcL ; compute parity of 'x'
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| 188 | swap byte
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| 189 | eor byte, resCrcL
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| 190 | mov scratch, byte
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| 191 | lsr byte
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| 192 | lsr byte
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| 193 | eor byte, scratch
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| 194 | inc byte
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| 195 | lsr byte
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| 196 | andi byte, 1 ; byte is now parity(x)
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| 197 | mov scratch, resCrcL
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| 198 | mov resCrcL, resCrcH
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| 199 | eor resCrcL, byte ; low byte of if(parity(x)) value ^= 0xc001;
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| 200 | neg byte
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| 201 | andi byte, 0xc0
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| 202 | mov resCrcH, byte ; high byte of if(parity(x)) value ^= 0xc001;
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| 203 | clr byte
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| 204 | lsr scratch
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| 205 | ror byte
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| 206 | eor resCrcH, scratch
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| 207 | eor resCrcL, byte
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| 208 | lsr scratch
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| 209 | ror byte
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| 210 | eor resCrcH, scratch
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| 211 | eor resCrcL, byte
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| 212 | usbCrc16LoopTest:
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| 213 | subi argLen, 1
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| 214 | brsh usbCrc16ByteLoop
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| 215 | com resCrcL
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| 216 | com resCrcH
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| 217 | ret
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| 218 |
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| 219 | #else /* USB_USE_FAST_CRC */
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| 220 |
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| 221 | ; This implementation is slower, but has less code size
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| 222 | ;
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| 223 | ; extern unsigned usbCrc16(unsigned char *argPtr, unsigned char argLen);
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| 224 | ; argPtr r24+25 / r16+r17
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| 225 | ; argLen r22 / r18
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| 226 | ; temp variables:
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| 227 | ; byte r18 / r22
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| 228 | ; bitCnt r19
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| 229 | ; poly r20+r21
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| 230 | ; scratch r23
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| 231 | ; resCrc r24+r25 / r16+r17
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| 232 | ; ptr X / Z
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| 233 | usbCrc16:
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| 234 | mov ptrL, argPtrL
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| 235 | mov ptrH, argPtrH
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| 236 | ldi resCrcL, 0
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| 237 | ldi resCrcH, 0
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| 238 | ldi polyL, lo8(0xa001)
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| 239 | ldi polyH, hi8(0xa001)
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| 240 | com argLen ; argLen = -argLen - 1: modified loop to ensure that carry is set
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| 241 | ldi bitCnt, 0 ; loop counter with starnd condition = end condition
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| 242 | rjmp usbCrcLoopEntry
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| 243 | usbCrcByteLoop:
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| 244 | ld byte, ptr+
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| 245 | eor resCrcL, byte
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| 246 | usbCrcBitLoop:
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| 247 | ror resCrcH ; carry is always set here (see brcs jumps to here)
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| 248 | ror resCrcL
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| 249 | brcs usbCrcNoXor
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| 250 | eor resCrcL, polyL
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| 251 | eor resCrcH, polyH
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| 252 | usbCrcNoXor:
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| 253 | subi bitCnt, 224 ; (8 * 224) % 256 = 0; this loop iterates 8 times
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| 254 | brcs usbCrcBitLoop
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| 255 | usbCrcLoopEntry:
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| 256 | subi argLen, -1
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| 257 | brcs usbCrcByteLoop
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| 258 | usbCrcReady:
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| 259 | ret
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| 260 | ; Thanks to Reimar Doeffinger for optimizing this CRC routine!
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| 261 |
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| 262 | #endif /* USB_USE_FAST_CRC */
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| 263 |
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| 264 | ; extern unsigned usbCrc16Append(unsigned char *data, unsigned char len);
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| 265 | usbCrc16Append:
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| 266 | rcall usbCrc16
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| 267 | st ptr+, resCrcL
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| 268 | st ptr+, resCrcH
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| 269 | ret
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| 270 |
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| 271 | #undef argLen
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| 272 | #undef argPtrL
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| 273 | #undef argPtrH
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| 274 | #undef resCrcL
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| 275 | #undef resCrcH
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| 276 | #undef ptrL
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| 277 | #undef ptrH
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| 278 | #undef ptr
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| 279 | #undef byte
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| 280 | #undef bitCnt
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| 281 | #undef polyL
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| 282 | #undef polyH
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| 283 | #undef scratch
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| 284 |
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| 285 |
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| 286 | #if USB_CFG_HAVE_MEASURE_FRAME_LENGTH
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| 287 | #ifdef __IAR_SYSTEMS_ASM__
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| 288 | /* Register assignments for usbMeasureFrameLength on IAR cc */
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| 289 | /* Calling conventions on IAR:
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| 290 | * First parameter passed in r16/r17, second in r18/r19 and so on.
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| 291 | * Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer)
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| 292 | * Result is passed in r16/r17
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| 293 | * In case of the "tiny" memory model, pointers are only 8 bit with no
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| 294 | * padding. We therefore pass argument 1 as "16 bit unsigned".
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| 295 | */
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| 296 | # define resL r16
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| 297 | # define resH r17
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| 298 | # define cnt16L r30
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| 299 | # define cnt16H r31
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| 300 | # define cntH r18
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| 301 |
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| 302 | #else /* __IAR_SYSTEMS_ASM__ */
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| 303 | /* Register assignments for usbMeasureFrameLength on gcc */
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| 304 | /* Calling conventions on gcc:
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| 305 | * First parameter passed in r24/r25, second in r22/23 and so on.
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| 306 | * Callee must preserve r1-r17, r28/r29
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| 307 | * Result is passed in r24/r25
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| 308 | */
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| 309 | # define resL r24
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| 310 | # define resH r25
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| 311 | # define cnt16L r24
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| 312 | # define cnt16H r25
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| 313 | # define cntH r26
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| 314 | #endif
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| 315 | # define cnt16 cnt16L
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| 316 |
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| 317 | ; extern unsigned usbMeasurePacketLength(void);
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| 318 | ; returns time between two idle strobes in multiples of 7 CPU clocks
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| 319 | .global usbMeasureFrameLength
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| 320 | usbMeasureFrameLength:
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| 321 | ldi cntH, 6 ; wait ~ 10 ms for D- == 0
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| 322 | clr cnt16L
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| 323 | clr cnt16H
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| 324 | usbMFTime16:
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| 325 | dec cntH
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| 326 | breq usbMFTimeout
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| 327 | usbMFWaitStrobe: ; first wait for D- == 0 (idle strobe)
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| 328 | sbiw cnt16, 1 ;[0] [6]
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| 329 | breq usbMFTime16 ;[2]
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| 330 | sbic USBIN, USBMINUS ;[3]
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| 331 | rjmp usbMFWaitStrobe ;[4]
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| 332 | usbMFWaitIdle: ; then wait until idle again
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| 333 | sbis USBIN, USBMINUS ;1 wait for D- == 1
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| 334 | rjmp usbMFWaitIdle ;2
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| 335 | ldi cnt16L, 1 ;1 represents cycles so far
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| 336 | clr cnt16H ;1
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| 337 | usbMFWaitLoop:
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| 338 | in cntH, USBIN ;[0] [7]
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| 339 | adiw cnt16, 1 ;[1]
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| 340 | breq usbMFTimeout ;[3]
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| 341 | andi cntH, USBMASK ;[4]
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| 342 | brne usbMFWaitLoop ;[5]
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| 343 | usbMFTimeout:
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| 344 | #if resL != cnt16L
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| 345 | mov resL, cnt16L
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| 346 | mov resH, cnt16H
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| 347 | #endif
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| 348 | ret
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| 349 |
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| 350 | #undef resL
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| 351 | #undef resH
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| 352 | #undef cnt16
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| 353 | #undef cnt16L
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| 354 | #undef cnt16H
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| 355 | #undef cntH
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| 356 |
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| 357 | #endif /* USB_CFG_HAVE_MEASURE_FRAME_LENGTH */
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| 358 |
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| 359 | ;----------------------------------------------------------------------------
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| 360 | ; Now include the clock rate specific code
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| 361 | ;----------------------------------------------------------------------------
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| 362 |
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| 363 | #ifndef USB_CFG_CLOCK_KHZ
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| 364 | # ifdef F_CPU
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| 365 | # define USB_CFG_CLOCK_KHZ (F_CPU/1000)
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| 366 | # else
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| 367 | # error "USB_CFG_CLOCK_KHZ not defined in usbconfig.h and no F_CPU set!"
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| 368 | # endif
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| 369 | #endif
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| 370 |
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| 371 | #if USB_CFG_CHECK_CRC /* separate dispatcher for CRC type modules */
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| 372 | # if USB_CFG_CLOCK_KHZ == 18000
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| 373 | # include "usbdrvasm18-crc.inc"
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| 374 | # else
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| 375 | # error "USB_CFG_CLOCK_KHZ is not one of the supported crc-rates!"
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| 376 | # endif
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| 377 | #else /* USB_CFG_CHECK_CRC */
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| 378 | # if USB_CFG_CLOCK_KHZ == 12000
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| 379 | # include "usbdrvasm12.inc"
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| 380 | # elif USB_CFG_CLOCK_KHZ == 12800
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| 381 | # include "usbdrvasm128.inc"
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| 382 | # elif USB_CFG_CLOCK_KHZ == 15000
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| 383 | # include "usbdrvasm15.inc"
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| 384 | # elif USB_CFG_CLOCK_KHZ == 16000
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| 385 | # include "usbdrvasm16.inc"
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| 386 | # elif USB_CFG_CLOCK_KHZ == 16500
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| 387 | # include "usbdrvasm165.inc"
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| 388 | # elif USB_CFG_CLOCK_KHZ == 20000
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| 389 | # include "usbdrvasm20.inc"
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| 390 | # else
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| 391 | # error "USB_CFG_CLOCK_KHZ is not one of the supported non-crc-rates!"
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| 392 | # endif
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| 393 | #endif /* USB_CFG_CHECK_CRC */
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