diff options
Diffstat (limited to 'protocol/vusb/usbdrv/asmcommon.inc')
| -rw-r--r-- | protocol/vusb/usbdrv/asmcommon.inc | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/protocol/vusb/usbdrv/asmcommon.inc b/protocol/vusb/usbdrv/asmcommon.inc deleted file mode 100644 index 07d692be3b..0000000000 --- a/protocol/vusb/usbdrv/asmcommon.inc +++ /dev/null @@ -1,188 +0,0 @@ -/* Name: asmcommon.inc - * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers - * Author: Christian Starkjohann - * Creation Date: 2007-11-05 - * 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: $Id$ - */ - -/* Do not link this file! Link usbdrvasm.S instead, which includes the - * appropriate implementation! - */ - -/* -General Description: -This file contains assembler code which is shared among the USB driver -implementations for different CPU cocks. Since the code must be inserted -in the middle of the module, it's split out into this file and #included. - -Jump destinations called from outside: - sofError: Called when no start sequence was found. - se0: Called when a package has been successfully received. - overflow: Called when receive buffer overflows. - doReturn: Called after sending data. - -Outside jump destinations used by this module: - waitForJ: Called to receive an already arriving packet. - sendAckAndReti: - sendNakAndReti: - sendCntAndReti: - usbSendAndReti: - -The following macros must be defined before this file is included: - .macro POP_STANDARD - .endm - .macro POP_RETI - .endm -*/ - -#define token x1 - -overflow: - ldi x2, 1<<USB_INTR_PENDING_BIT - USB_STORE_PENDING(x2) ; clear any pending interrupts -ignorePacket: - clr token - rjmp storeTokenAndReturn - -;---------------------------------------------------------------------------- -; Processing of received packet (numbers in brackets are cycles after center of SE0) -;---------------------------------------------------------------------------- -;This is the only non-error exit point for the software receiver loop -;we don't check any CRCs here because there is no time left. -se0: - subi cnt, USB_BUFSIZE ;[5] - neg cnt ;[6] - sub YL, cnt ;[7] - sbci YH, 0 ;[8] - ldi x2, 1<<USB_INTR_PENDING_BIT ;[9] - USB_STORE_PENDING(x2) ;[10] clear pending intr and check flag later. SE0 should be over. - ld token, y ;[11] - cpi token, USBPID_DATA0 ;[13] - breq handleData ;[14] - cpi token, USBPID_DATA1 ;[15] - breq handleData ;[16] - lds shift, usbDeviceAddr;[17] - ldd x2, y+1 ;[19] ADDR and 1 bit endpoint number - lsl x2 ;[21] shift out 1 bit endpoint number - cpse x2, shift ;[22] - rjmp ignorePacket ;[23] -/* only compute endpoint number in x3 if required later */ -#if USB_CFG_HAVE_INTRIN_ENDPOINT || USB_CFG_IMPLEMENT_FN_WRITEOUT - ldd x3, y+2 ;[24] endpoint number + crc - rol x3 ;[26] shift in LSB of endpoint -#endif - cpi token, USBPID_IN ;[27] - breq handleIn ;[28] - cpi token, USBPID_SETUP ;[29] - breq handleSetupOrOut ;[30] - cpi token, USBPID_OUT ;[31] - brne ignorePacket ;[32] must be ack, nak or whatever -; rjmp handleSetupOrOut ; fallthrough - -;Setup and Out are followed by a data packet two bit times (16 cycles) after -;the end of SE0. The sync code allows up to 40 cycles delay from the start of -;the sync pattern until the first bit is sampled. That's a total of 56 cycles. -handleSetupOrOut: ;[32] -#if USB_CFG_IMPLEMENT_FN_WRITEOUT /* if we have data for endpoint != 0, set usbCurrentTok to address */ - andi x3, 0xf ;[32] - breq storeTokenAndReturn ;[33] - mov token, x3 ;[34] indicate that this is endpoint x OUT -#endif -storeTokenAndReturn: - sts usbCurrentTok, token;[35] -doReturn: - POP_STANDARD ;[37] 12...16 cycles - USB_LOAD_PENDING(YL) ;[49] - sbrc YL, USB_INTR_PENDING_BIT;[50] check whether data is already arriving - rjmp waitForJ ;[51] save the pops and pushes -- a new interrupt is already pending -sofError: - POP_RETI ;macro call - reti - -handleData: -#if USB_CFG_CHECK_CRC - CRC_CLEANUP_AND_CHECK ; jumps to ignorePacket if CRC error -#endif - lds shift, usbCurrentTok;[18] - tst shift ;[20] - breq doReturn ;[21] - lds x2, usbRxLen ;[22] - tst x2 ;[24] - brne sendNakAndReti ;[25] -; 2006-03-11: The following two lines fix a problem where the device was not -; recognized if usbPoll() was called less frequently than once every 4 ms. - cpi cnt, 4 ;[26] zero sized data packets are status phase only -- ignore and ack - brmi sendAckAndReti ;[27] keep rx buffer clean -- we must not NAK next SETUP -#if USB_CFG_CHECK_DATA_TOGGLING - sts usbCurrentDataToken, token ; store for checking by C code -#endif - sts usbRxLen, cnt ;[28] store received data, swap buffers - sts usbRxToken, shift ;[30] - lds x2, usbInputBufOffset;[32] swap buffers - ldi cnt, USB_BUFSIZE ;[34] - sub cnt, x2 ;[35] - sts usbInputBufOffset, cnt;[36] buffers now swapped - rjmp sendAckAndReti ;[38] 40 + 17 = 57 until SOP - -handleIn: -;We don't send any data as long as the C code has not processed the current -;input data and potentially updated the output data. That's more efficient -;in terms of code size than clearing the tx buffers when a packet is received. - lds x1, usbRxLen ;[30] - cpi x1, 1 ;[32] negative values are flow control, 0 means "buffer free" - brge sendNakAndReti ;[33] unprocessed input packet? - ldi x1, USBPID_NAK ;[34] prepare value for usbTxLen -#if USB_CFG_HAVE_INTRIN_ENDPOINT - andi x3, 0xf ;[35] x3 contains endpoint -#if USB_CFG_SUPPRESS_INTR_CODE - brne sendNakAndReti ;[36] -#else - brne handleIn1 ;[36] -#endif -#endif - lds cnt, usbTxLen ;[37] - sbrc cnt, 4 ;[39] all handshake tokens have bit 4 set - rjmp sendCntAndReti ;[40] 42 + 16 = 58 until SOP - sts usbTxLen, x1 ;[41] x1 == USBPID_NAK from above - ldi YL, lo8(usbTxBuf) ;[43] - ldi YH, hi8(usbTxBuf) ;[44] - rjmp usbSendAndReti ;[45] 57 + 12 = 59 until SOP - -; Comment about when to set usbTxLen to USBPID_NAK: -; We should set it back when we receive the ACK from the host. This would -; be simple to implement: One static variable which stores whether the last -; tx was for endpoint 0 or 1 and a compare in the receiver to distinguish the -; ACK. However, we set it back immediately when we send the package, -; assuming that no error occurs and the host sends an ACK. We save one byte -; RAM this way and avoid potential problems with endless retries. The rest of -; the driver assumes error-free transfers anyway. - -#if !USB_CFG_SUPPRESS_INTR_CODE && USB_CFG_HAVE_INTRIN_ENDPOINT /* placed here due to relative jump range */ -handleIn1: ;[38] -#if USB_CFG_HAVE_INTRIN_ENDPOINT3 -; 2006-06-10 as suggested by O.Tamura: support second INTR IN / BULK IN endpoint - cpi x3, USB_CFG_EP3_NUMBER;[38] - breq handleIn3 ;[39] -#endif - lds cnt, usbTxLen1 ;[40] - sbrc cnt, 4 ;[42] all handshake tokens have bit 4 set - rjmp sendCntAndReti ;[43] 47 + 16 = 63 until SOP - sts usbTxLen1, x1 ;[44] x1 == USBPID_NAK from above - ldi YL, lo8(usbTxBuf1) ;[46] - ldi YH, hi8(usbTxBuf1) ;[47] - rjmp usbSendAndReti ;[48] 50 + 12 = 62 until SOP - -#if USB_CFG_HAVE_INTRIN_ENDPOINT3 -handleIn3: - lds cnt, usbTxLen3 ;[41] - sbrc cnt, 4 ;[43] - rjmp sendCntAndReti ;[44] 49 + 16 = 65 until SOP - sts usbTxLen3, x1 ;[45] x1 == USBPID_NAK from above - ldi YL, lo8(usbTxBuf3) ;[47] - ldi YH, hi8(usbTxBuf3) ;[48] - rjmp usbSendAndReti ;[49] 51 + 12 = 63 until SOP -#endif -#endif |