Mailing lists / fpc-devel / 2012-09
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I would like to port fpc to the AVR32 uc3c devices. I need more details on the functions that need to be implemented. The uc3c devices have hardware single precision floating point, CAN, USB and ethernet.
Michel
Michel Catudal wroteI would like to port fpc to the AVR32 uc3c devices. I need more details on the functions that need to be implemented.
Take a look at one of the other architectures like arm, fpc/compiler/arm contains the arm specific compiler files.
I have made a preliminary backend and RTL stub in branches/laksen/avr32new/
Some of the large problems is that the load instructions allow non-aligned loads in the ld.w forms. This proves to introduce many strange problems, and I don't have any debug equipment.
Regards, Jeppe
________________________________________
Fra: på vegne af Florian Klämpfl
Sendt: 13. september 2012 19:08
Til: FPC developers' list
Emne: Re: [fpc-devel] fpc on AVR32
Michel Catudal wroteI would like to port fpc to the AVR32 uc3c devices. I need more details on the functions that need to be implemented.
Take a look at one of the other architectures like arm, fpc/compiler/arm contains the arm specific compiler files.
Why is this a problem?
Because PC relative loads with the wide format aren't automatically aligned to a 4 byte boundary by the processor, and the instruction set is a variable length 16bit ISA like thumb-2.
There were a few other issues that were highly annoying too, but I can't remember what they were. Other than that the ISA was beautifully simple.
I have made a preliminary backend and RTL stub in branches/laksen/avr32new/ Some of the…
I bought JTAGICE mkII, it works nicely with Scientific Linux 6.2. The binaries from Fedora 12 and 13 work with Scientifc Linux. I will have no problem with debugging AVR32 code. What I find with AVR32 is that it makes nice compact code.
I have written code for a cluster with a Micronas (ARM7TDMI) and AVR32UC3C 144 pins and found a major reduction in code size and code is a lot faster. That is running at the same speed. I run will look at your code, nice to know that I don't have to start from scratch. I don't really like eclipse, do you know if anyone is working on a plugin for codeblocks? I will have to learn the AVR32 assembler. I have coded automotive applications with the 100 pins and 144 pins devices AVR32UC3C but only in C with IAR. I have a very good knowledge of the processors. I wrote a lot of assembler with the AVR8 but never with the AVR32.
At home I use gcc with eclipse since it is the only thing right now.
Just so you know, I started with microprocessors in the early 70s, thus not a newbie with microprocessors.
I will keep you posted of my progress.
Michel
Agreed, it is a very good processor.
MSEide can be used to debug AVR32 programs with gdb and the ATMEL gdb server. I use it in combination with the "AVR ONE!" debug interface and the gnu tool chain.
http://sourceforge.net/projects/mseide-msegui/
Martin
I bought JTAGICE mkII, it works nicely with Scientific Linux 6.2. The binaries from…
Did you use the Thumb ISA for the ARM ? Same is said to be more compact than ARM32. With a slow memory interface (regarding CPU speed) Thumb might be faster, too.
-Michael
Yes because code would not fit otherwise and I had the largest flash processor available. The micronas device uses AMD/Spansion flash internally. We were in production for just a few years with Micronas and they decided to discontinue all the ARM devices that we were using. The redesign has cost us a fortune. A few months later at a show in Detroit a Micronas salesman asked me if I was interested in their processors. My response was that their name was a curse where I work.