Re-reading your initial mail I am kind of wondering what you actually did ?
When using -WpSTM32F407VG you will automagially use stm32f407xx.pp unit
which is the correct one for your chip and also stack should be correct
as ram size is set to 128MB.
How/why did you use STM32F429 unit for the chip?
Michael
Am 19.03.16 um 12:36 schrieb Michael Ring:
Are you sure about RAM? I checked in cpuinfo, it is set to 128MB, this
matches what is written in the user manual, (Page 70)
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00037051.pdf
or are the last 16k for some special use? Could not find a hint while
quickly searching through the manual.
Michael
Am 19.03.16 um 04:47 schrieb Andrew Haines:
Hi,
I've been trying to get a very simple program to run on my discovery
board that I've had for a while(STM32F407VG). Using st-util with gdb
I managed to make some progress.
I've been using the code in fpc for STM32F429 since it's pretty
similar. My first problem was that the stackpointer was too high. The
STM32F407VG has 64kb less memory than the STM32F429. I added a define
in compiler/arm/cpuinfo.pas with the correct info and had it use the
STM32F429 unit. That fixed my first problem.
The next/current problem is in CommonInit in system.
SynchronizeTimeoutEvent:=RtlEventCreate;
RtlEventCreate has:
result:=currenttm.rtleventcreate();
This produces the assembly:
0x8007e08 <SYSTEM_$$_RTLEVENTCREATE$$PRTLEVENT> push {lr}
(gdb) i registers pc
pc 0x8007e0a 0x8007e0a
<SYSTEM_$$_RTLEVENTCREATE$$PRTLEVENT+2>
0x8007e0a <SYSTEM_$$_RTLEVENTCREATE$$PRTLEVENT+2> ldr r0, [pc, #8]
; (0x8007e14 <SYSTEM_$$_RTLEVENTCREATE$$PRTLEVENT+12>)
(gdb) i registers r0
r0 0x20001dc0 536878528 // the address 1dc0 seems
reasonable. Location of currenttm+rtleventcreate?
0x8007e0c <SYSTEM_$$_RTLEVENTCREATE$$PRTLEVENT+4> ldr r0, [r0, #0]
(gdb) i registers r0
r0 0x0 0
0x8007e0e <SYSTEM_$$_RTLEVENTCREATE$$PRTLEVENT+6> blx r0
For the last instruction r0 is nil. This causes the default interrupt
handler to be called which loops forever.
backtrace is:
(gdb) bt
#0 0x08007e0e in SYSTEM_$$_RTLEVENTCREATE$$PRTLEVENT ()
#1 0x0800ce5e in CLASSES_$$_COMMONINIT ()
#2 0x08012886 in CLASSES_$$_init ()
#3 0x08007a5c in fpc_initializeunits ()
#4 0x08000294 in main () at blinky.lpr:48
I compiled the crosscompiler with:
make clean buildbase CROSSINSTALL=1 CROSSOPT="-XParm-none-eabi-"
OS_TARGET=embedded CPU_TARGET=arm SUBARCH=armv7em
the program is compiled with
-Oparmv7em
-WpSTM32F407VG
I'm guessing there is some define I have to use and everything will
start working :)
Where do I go from here?
Thanks in advance,
Andrew Haines
_______________________________________________
fpc-devel maillist - [email protected]
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
_______________________________________________
fpc-devel maillist - [email protected]
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
_______________________________________________
fpc-devel maillist - [email protected]
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
