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