projects / ds1820tousb.git / blame
| Commit | Line | Data |
|---|---|---|
| 93ac315e MPM |
1 | /* Name: usbdrvasm.S |
| 2 | * Project: AVR USB driver | |
| 3 | * Author: Christian Starkjohann | |
| 4 | * Creation Date: 2007-06-13 | |
| 5 | * Tabsize: 4 | |
| 6 | * Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH | |
| 7 | * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt) | |
| 8 | * Revision: $Id: usbdrvasm.S 692 2008-11-07 15:07:40Z cs $ | |
| 9 | */ | |
| 10 | ||
| 11 | /* | |
| 12 | General Description: | |
| 13 | This module is the assembler part of the USB driver. This file contains | |
| 14 | general code (preprocessor acrobatics and CRC computation) and then includes | |
| 15 | the file appropriate for the given clock rate. | |
| 16 | */ | |
| 17 | ||
| 18 | #define __SFR_OFFSET 0 /* used by avr-libc's register definitions */ | |
| 19 | #include "usbportability.h" | |
| 20 | #include "usbdrv.h" /* for common defs */ | |
| 21 | ||
| 22 | /* register names */ | |
| 23 | #define x1 r16 | |
| 24 | #define x2 r17 | |
| 25 | #define shift r18 | |
| 26 | #define cnt r19 | |
| 27 | #define x3 r20 | |
| 28 | #define x4 r21 | |
| 29 | #define bitcnt r22 | |
| 30 | #define phase x4 | |
| 31 | #define leap x4 | |
| 32 | ||
| 33 | /* Some assembler dependent definitions and declarations: */ | |
| 34 | ||
| 35 | #ifdef __IAR_SYSTEMS_ASM__ | |
| 36 | extern usbRxBuf, usbDeviceAddr, usbNewDeviceAddr, usbInputBufOffset | |
| 37 | extern usbCurrentTok, usbRxLen, usbRxToken, usbTxLen | |
| 38 | extern usbTxBuf, usbTxStatus1, usbTxStatus3 | |
| 39 | # if USB_COUNT_SOF | |
| 40 | extern usbSofCount | |
| 41 | # endif | |
| 42 | public usbCrc16 | |
| 43 | public usbCrc16Append | |
| 44 | ||
| 45 | COMMON INTVEC | |
| 46 | # ifndef USB_INTR_VECTOR | |
| 47 | ORG INT0_vect | |
| 48 | # else /* USB_INTR_VECTOR */ | |
| 49 | ORG USB_INTR_VECTOR | |
| 50 | # undef USB_INTR_VECTOR | |
| 51 | # endif /* USB_INTR_VECTOR */ | |
| 52 | # define USB_INTR_VECTOR usbInterruptHandler | |
| 53 | rjmp USB_INTR_VECTOR | |
| 54 | RSEG CODE | |
| 55 | ||
| 56 | #else /* __IAR_SYSTEMS_ASM__ */ | |
| 57 | ||
| 58 | # ifndef USB_INTR_VECTOR /* default to hardware interrupt INT0 */ | |
| 59 | # define USB_INTR_VECTOR SIG_INTERRUPT0 | |
| 60 | # endif | |
| 61 | .text | |
| 62 | .global USB_INTR_VECTOR | |
| 63 | .type USB_INTR_VECTOR, @function | |
| 64 | .global usbCrc16 | |
| 65 | .global usbCrc16Append | |
| 66 | #endif /* __IAR_SYSTEMS_ASM__ */ | |
| 67 | ||
| 68 | ||
| 69 | #if USB_INTR_PENDING < 0x40 /* This is an I/O address, use in and out */ | |
| 70 | # define USB_LOAD_PENDING(reg) in reg, USB_INTR_PENDING | |
| 71 | # define USB_STORE_PENDING(reg) out USB_INTR_PENDING, reg | |
| 72 | #else /* It's a memory address, use lds and sts */ | |
| 73 | # define USB_LOAD_PENDING(reg) lds reg, USB_INTR_PENDING | |
| 74 | # define USB_STORE_PENDING(reg) sts USB_INTR_PENDING, reg | |
| 75 | #endif | |
| 76 | ||
| 77 | #define usbTxLen1 usbTxStatus1 | |
| 78 | #define usbTxBuf1 (usbTxStatus1 + 1) | |
| 79 | #define usbTxLen3 usbTxStatus3 | |
| 80 | #define usbTxBuf3 (usbTxStatus3 + 1) | |
| 81 | ||
| 82 | ||
| 83 | ;---------------------------------------------------------------------------- | |
| 84 | ; Utility functions | |
| 85 | ;---------------------------------------------------------------------------- | |
| 86 | ||
| 87 | #ifdef __IAR_SYSTEMS_ASM__ | |
| 88 | /* Register assignments for usbCrc16 on IAR cc */ | |
| 89 | /* Calling conventions on IAR: | |
| 90 | * First parameter passed in r16/r17, second in r18/r19 and so on. | |
| 91 | * Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer) | |
| 92 | * Result is passed in r16/r17 | |
| 93 | * In case of the "tiny" memory model, pointers are only 8 bit with no | |
| 94 | * padding. We therefore pass argument 1 as "16 bit unsigned". | |
| 95 | */ | |
| 96 | RTMODEL "__rt_version", "3" | |
| 97 | /* The line above will generate an error if cc calling conventions change. | |
| 98 | * The value "3" above is valid for IAR 4.10B/W32 | |
| 99 | */ | |
| 100 | # define argLen r18 /* argument 2 */ | |
| 101 | # define argPtrL r16 /* argument 1 */ | |
| 102 | # define argPtrH r17 /* argument 1 */ | |
| 103 | ||
| 104 | # define resCrcL r16 /* result */ | |
| 105 | # define resCrcH r17 /* result */ | |
| 106 | ||
| 107 | # define ptrL ZL | |
| 108 | # define ptrH ZH | |
| 109 | # define ptr Z | |
| 110 | # define byte r22 | |
| 111 | # define bitCnt r19 | |
| 112 | # define polyL r20 | |
| 113 | # define polyH r21 | |
| 114 | # define scratch r23 | |
| 115 | ||
| 116 | #else /* __IAR_SYSTEMS_ASM__ */ | |
| 117 | /* Register assignments for usbCrc16 on gcc */ | |
| 118 | /* Calling conventions on gcc: | |
| 119 | * First parameter passed in r24/r25, second in r22/23 and so on. | |
| 120 | * Callee must preserve r1-r17, r28/r29 | |
| 121 | * Result is passed in r24/r25 | |
| 122 | */ | |
| 123 | # define argLen r22 /* argument 2 */ | |
| 124 | # define argPtrL r24 /* argument 1 */ | |
| 125 | # define argPtrH r25 /* argument 1 */ | |
| 126 | ||
| 127 | # define resCrcL r24 /* result */ | |
| 128 | # define resCrcH r25 /* result */ | |
| 129 | ||
| 130 | # define ptrL XL | |
| 131 | # define ptrH XH | |
| 132 | # define ptr x | |
| 133 | # define byte r18 | |
| 134 | # define bitCnt r19 | |
| 135 | # define polyL r20 | |
| 136 | # define polyH r21 | |
| 137 | # define scratch r23 | |
| 138 | ||
| 139 | #endif | |
| 140 | ||
| 141 | ; extern unsigned usbCrc16(unsigned char *data, unsigned char len); | |
| 142 | ; data: r24/25 | |
| 143 | ; len: r22 | |
| 144 | ; temp variables: | |
| 145 | ; r18: data byte | |
| 146 | ; r19: bit counter | |
| 147 | ; r20/21: polynomial | |
| 148 | ; r23: scratch | |
| 149 | ; r24/25: crc-sum | |
| 150 | ; r26/27=X: ptr | |
| 151 | usbCrc16: | |
| 152 | mov ptrL, argPtrL | |
| 153 | mov ptrH, argPtrH | |
| 154 | ldi resCrcL, 0 | |
| 155 | ldi resCrcH, 0 | |
| 156 | ldi polyL, lo8(0xa001) | |
| 157 | ldi polyH, hi8(0xa001) | |
| 158 | com argLen ; argLen = -argLen - 1 | |
| 159 | crcByteLoop: | |
| 160 | subi argLen, -1 | |
| 161 | brcc crcReady ; modified loop to ensure that carry is set below | |
| 162 | ld byte, ptr+ | |
| 163 | ldi bitCnt, -8 ; strange loop counter to ensure that carry is set where we need it | |
| 164 | eor resCrcL, byte | |
| 165 | crcBitLoop: | |
| 166 | ror resCrcH ; carry is always set here | |
| 167 | ror resCrcL | |
| 168 | brcs crcNoXor | |
| 169 | eor resCrcL, polyL | |
| 170 | eor resCrcH, polyH | |
| 171 | crcNoXor: | |
| 172 | subi bitCnt, -1 | |
| 173 | brcs crcBitLoop | |
| 174 | rjmp crcByteLoop | |
| 175 | crcReady: | |
| 176 | ret | |
| 177 | ; Thanks to Reimar Doeffinger for optimizing this CRC routine! | |
| 178 | ||
| 179 | ; extern unsigned usbCrc16Append(unsigned char *data, unsigned char len); | |
| 180 | usbCrc16Append: | |
| 181 | rcall usbCrc16 | |
| 182 | st ptr+, resCrcL | |
| 183 | st ptr+, resCrcH | |
| 184 | ret | |
| 185 | ||
| 186 | #undef argLen | |
| 187 | #undef argPtrL | |
| 188 | #undef argPtrH | |
| 189 | #undef resCrcL | |
| 190 | #undef resCrcH | |
| 191 | #undef ptrL | |
| 192 | #undef ptrH | |
| 193 | #undef ptr | |
| 194 | #undef byte | |
| 195 | #undef bitCnt | |
| 196 | #undef polyL | |
| 197 | #undef polyH | |
| 198 | #undef scratch | |
| 199 | ||
| 200 | ||
| 201 | #if USB_CFG_HAVE_MEASURE_FRAME_LENGTH | |
| 202 | #ifdef __IAR_SYSTEMS_ASM__ | |
| 203 | /* Register assignments for usbMeasureFrameLength on IAR cc */ | |
| 204 | /* Calling conventions on IAR: | |
| 205 | * First parameter passed in r16/r17, second in r18/r19 and so on. | |
| 206 | * Callee must preserve r4-r15, r24-r29 (r28/r29 is frame pointer) | |
| 207 | * Result is passed in r16/r17 | |
| 208 | * In case of the "tiny" memory model, pointers are only 8 bit with no | |
| 209 | * padding. We therefore pass argument 1 as "16 bit unsigned". | |
| 210 | */ | |
| 211 | # define resL r16 | |
| 212 | # define resH r17 | |
| 213 | # define cnt16L r30 | |
| 214 | # define cnt16H r31 | |
| 215 | # define cntH r18 | |
| 216 | ||
| 217 | #else /* __IAR_SYSTEMS_ASM__ */ | |
| 218 | /* Register assignments for usbMeasureFrameLength on gcc */ | |
| 219 | /* Calling conventions on gcc: | |
| 220 | * First parameter passed in r24/r25, second in r22/23 and so on. | |
| 221 | * Callee must preserve r1-r17, r28/r29 | |
| 222 | * Result is passed in r24/r25 | |
| 223 | */ | |
| 224 | # define resL r24 | |
| 225 | # define resH r25 | |
| 226 | # define cnt16L r24 | |
| 227 | # define cnt16H r25 | |
| 228 | # define cntH r26 | |
| 229 | #endif | |
| 230 | # define cnt16 cnt16L | |
| 231 | ||
| 232 | ; extern unsigned usbMeasurePacketLength(void); | |
| 233 | ; returns time between two idle strobes in multiples of 7 CPU clocks | |
| 234 | .global usbMeasureFrameLength | |
| 235 | usbMeasureFrameLength: | |
| 236 | ldi cntH, 6 ; wait ~ 10 ms for D- == 0 | |
| 237 | clr cnt16L | |
| 238 | clr cnt16H | |
| 239 | usbMFTime16: | |
| 240 | dec cntH | |
| 241 | breq usbMFTimeout | |
| 242 | usbMFWaitStrobe: ; first wait for D- == 0 (idle strobe) | |
| 243 | sbiw cnt16, 1 ;[0] [6] | |
| 244 | breq usbMFTime16 ;[2] | |
| 245 | sbic USBIN, USBMINUS ;[3] | |
| 246 | rjmp usbMFWaitStrobe ;[4] | |
| 247 | usbMFWaitIdle: ; then wait until idle again | |
| 248 | sbis USBIN, USBMINUS ;1 wait for D- == 1 | |
| 249 | rjmp usbMFWaitIdle ;2 | |
| 250 | ldi cnt16L, 1 ;1 represents cycles so far | |
| 251 | clr cnt16H ;1 | |
| 252 | usbMFWaitLoop: | |
| 253 | in cntH, USBIN ;[0] [7] | |
| 254 | adiw cnt16, 1 ;[1] | |
| 255 | breq usbMFTimeout ;[3] | |
| 256 | andi cntH, USBMASK ;[4] | |
| 257 | brne usbMFWaitLoop ;[5] | |
| 258 | usbMFTimeout: | |
| 259 | #if resL != cnt16L | |
| 260 | mov resL, cnt16L | |
| 261 | mov resH, cnt16H | |
| 262 | #endif | |
| 263 | ret | |
| 264 | ||
| 265 | #undef resL | |
| 266 | #undef resH | |
| 267 | #undef cnt16 | |
| 268 | #undef cnt16L | |
| 269 | #undef cnt16H | |
| 270 | #undef cntH | |
| 271 | ||
| 272 | #endif /* USB_CFG_HAVE_MEASURE_FRAME_LENGTH */ | |
| 273 | ||
| 274 | ;---------------------------------------------------------------------------- | |
| 275 | ; Now include the clock rate specific code | |
| 276 | ;---------------------------------------------------------------------------- | |
| 277 | ||
| 278 | #ifndef USB_CFG_CLOCK_KHZ | |
| 279 | # define USB_CFG_CLOCK_KHZ 12000 | |
| 280 | #endif | |
| 281 | ||
| 282 | #if USB_CFG_CLOCK_KHZ == 12000 | |
| 283 | # include "usbdrvasm12.inc" | |
| 284 | #elif USB_CFG_CLOCK_KHZ == 12800 | |
| 285 | # include "usbdrvasm128.inc" | |
| 286 | #elif USB_CFG_CLOCK_KHZ == 15000 | |
| 287 | # include "usbdrvasm15.inc" | |
| 288 | #elif USB_CFG_CLOCK_KHZ == 16000 | |
| 289 | # include "usbdrvasm16.inc" | |
| 290 | #elif USB_CFG_CLOCK_KHZ == 16500 | |
| 291 | # include "usbdrvasm165.inc" | |
| 292 | #elif USB_CFG_CLOCK_KHZ == 20000 | |
| 293 | # include "usbdrvasm20.inc" | |
| 294 | #else | |
| 295 | # error "USB_CFG_CLOCK_KHZ is not one of the supported rates!" | |
| 296 | #endif |