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d87ac86f53
- Goals for rlink v4
- 16 bit addresses (instead of 8 bit)
- more robust encoding, support for error recovery at transport level
- add features to reduce round trips
- improved attention handling
- new 'list abort' command
- For further details see README_Rlink_V4.txt
- use own C++ based tcl shell tclshcpp instead of tclsh
80 lines
2.8 KiB
Plaintext
80 lines
2.8 KiB
Plaintext
# $Id: README.txt 604 2014-11-16 22:33:09Z mueller $
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#
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The FX2 software is based on the Sourceforge project ixo-jtag
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http://sourceforge.net/projects/ixo-jtag/
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The usb_jtag sub project was checked out on 2011-07-17 (Rev 204) from
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Sourceforge and take as the basis for the further developement.
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The original README.txt is preserved under README_iso_jtag.txt.
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Only the hw_nexys.c branch is kept on the import.
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Change log:
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2014-11-16 (Rev 604)
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- ported to sdcc 3.3
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- all prior development was done with sdcc 2.x, latest sdcc 2.9 was bundled
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with Ubuntu 12.04 LTS.
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- now switching to sdcc 3.3 as bundled with Ubuntu 14.04 LTS.
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- mayor changes:
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1. assembler now named sdas8051 (was asx8051)
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2. all special reserved keywords start now with a double underscore
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at --> __at
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bit --> __bit
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interrupt --> __interrupt
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sbit --> __sbit
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sfr --> __sfr
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xdata --> __xdata
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_asm --> __asm
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_endasm --> __endasm
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_naked --> __naked
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- in general sources stayed untouched in the sdcc 2.9 form, all keyword
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mappings are done with the preprocessor and defs like "-Dat=__at"
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- make usage now
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- default is now sdcc 3.x, in this case simply use
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make clean && make
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- on systems with sdcc 2.x use
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make clean && make SDCC29=1
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- detected and fixed BUG inherted from ixo-jtag and GNU Radio in SYNCDELAY
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The macro SYNCDELAY (defined in lib/syncdelay.h) inserts 'nop' needed
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to resolve some timing issues in the FX2. The old implementation was
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#define SYNCDELAY _asm nop; nop; nop; _endasm
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#define NOP _asm nop; _endasm
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This inserts into the assembler output a single line
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nop; nop; nop;
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Since ';' is the comment delimiter for the assember the 2nd and 3rd nop
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are simply ignored.
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This wrong implementation was changed to
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#define SYNCDELAY NOP; NOP; NOP
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That created three lines in the assembler output
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nop;
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nop;
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nop;
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and generated the three desired nops in the binary.
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!! This was definitively broken from the very beginning. !!
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!! The code ran alway. Reason is mosu likely that the SYNCDELAY !!
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!! macros were only used in the setup phase and never is a !!
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!! really time critical context. !!
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2011-07-17 (Rev 395)
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- Makefile: reorganized to support multiple target/fifo configs
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- renames:
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dscr.a51->dscr_jtag.a51
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hw_nexys.c->hw_nexys2.c
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usbjtag.c->main.c
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- dscr_jtag.a51
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- Use USB 2.0; New string values
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- use 512 byte for all high speed endpoints
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- dscr_jtag_2fifo.a51
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- dscr with EP4 as HOST->FPGA and EP6 as FPGA->HOST hardware fifo
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