Lpc2000

Hello,
Im trying to write some data from the RAM to the flash using the IAP, I followed the application note pdf given by philips but when I call the iap_entry function the processor seems to hang...nothing happens at all!!!
 
Do you pass the command code and command parameters into the command data structure or am I missing something..even when I try to do something simple like read the Part ID it seems to hang!
Thanks....again!
David

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--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Hello,
> Im trying to write some data from the RAM to the flash using the 
IAP, I followed the application note pdf given by philips but when I 
call the iap_entry function the processor seems to hang...nothing 
happens at all!!!
>  
> Do you pass the command code and command parameters into the 
command data structure or am I missing something..even when I try to 
do something simple like read the Part ID it seems to hang!
> Thanks....again!
> David

When you say "nothing happens at all", what do you mean? Is it stuck 
in the IAP code or did it cause an exception?

There are a few things that I can think of that might be causing 
problems:
* Incorrect set up of parameters. Likely to cause a data abort.
* Incorrect set up of the thumb bx stuff. Likely to cause a prefetch 
or other abort.

-- Charles

Yeah, I call iap_entry(command,result) and the next line of the code is printf something and it never calls the printf. I pretty much copied the philips code from the app note because this stuff is new to me!(Like most of it!!!) so it must be incorrect parameter passing??

embeddedjanitor <manningc2@...> wrote:--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Hello,
> Im trying to write some data from the RAM to the flash using the 
IAP, I followed the application note pdf given by philips but when I 
call the iap_entry function the processor seems to hang...nothing 
happens at all!!!
>  
> Do you pass the command code and command parameters into the 
command data structure or am I missing something..even when I try to 
do something simple like read the Part ID it seems to hang!
> Thanks....again!
> David

When you say "nothing happens at all", what do you mean? Is it stuck 
in the IAP code or did it cause an exception?

There are a few things that I can think of that might be causing 
problems:
* Incorrect set up of parameters. Likely to cause a data abort.
* Incorrect set up of the thumb bx stuff. Likely to cause a prefetch 
or other abort.

-- Charles



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--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Yeah, I call iap_entry(command,result) and the next line of the code 
is printf something and it never calls the printf. I pretty much 
copied the philips code from the app note because this stuff is new to 
me!(Like most of it!!!) so it must be incorrect parameter passing??

I guess you are using the GCC compiler and the ARM instruction set? 
Because I'm using that (along with AsIDE) and had exactly the same 
problem.

After some reading, and googling and some more reading and some 
assembly debugging we found some clues that lead to the solution. 

In short: turn on the compiler option '-mthumb-interwork'. This is 
nessecary since the bootloader function you are accessing is written 
in Thumb code, see page 193 of the user manual of 2003 okt 02. 

You should jump from ARM to Thumb using the BX instruction from the 
ARM instruction set. This is automatically done by your compiler but 
GCC has this function (thumb-interwork) disabled by default since it 
generates slightly bigger code. When you switch it on you shuld be 
fine...

Hope that helped!
Greetings,
Herman

Thanks for the reply, Im using ARM ADS 1.2 to compile the code! Does anybody know how or if I have to turn on interworking for ADS?
 
Also, I have a routine which has to be executed out of RAM instead of Flash to operate properly. When I change the scatterloading file so that aes.o is loaded in RAM the program never branches to it...its like its not there!!
When I check the map file generated by ADS it says the code is located in RAM.
 
Is there a way to set up the scatterloading file so that the routine is copied from Flash to RAM and executed from RAM?
 
Sorry for all the questions!
Thanks,
David

deballendeballen <yahoo@...> wrote:
--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Yeah, I call iap_entry(command,result) and the next line of the code 
is printf something and it never calls the printf. I pretty much 
copied the philips code from the app note because this stuff is new to 
me!(Like most of it!!!) so it must be incorrect parameter passing??

I guess you are using the GCC compiler and the ARM instruction set? 
Because I'm using that (along with AsIDE) and had exactly the same 
problem.

After some reading, and googling and some more reading and some 
assembly debugging we found some clues that lead to the solution. 

In short: turn on the compiler option '-mthumb-interwork'. This is 
nessecary since the bootloader function you are accessing is written 
in Thumb code, see page 193 of the user manual of 2003 okt 02. 

You should jump from ARM to Thumb using the BX instruction from the 
ARM instruction set. This is automatically done by your compiler but 
GCC has this function (thumb-interwork) disabled by default since it 
generates slightly bigger code. When you switch it on you shuld be 
fine...

Hope that helped!
Greetings,
Herman



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--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Thanks for the reply, Im using ARM ADS 1.2 to compile the code! 
Does anybody know how or if I have to turn on interworking for ADS?

Hi David, yes you need to turn on interworking, however this is done 
for you automatically if you create an application using the 
Thumb/ARM interworking template. This is convenient as you simply 
place source files to be built as ARM code in the ARM subproject, 
and the IDE takes care of all the other details.

Alternatively, you'll find the interworking tickbox in the project 
settings dialog, under the ATPCS tab when you select the assembler, 
ARM C compiler or Thumb C compiler. A major irritation (for me 
anyway) is that you have to set this for each subproject (Thumb and 
ARM), each target (Debug, DebugRel, Release) and each tool (asm, C, 
C++) that you use.

>  
> Also, I have a routine which has to be executed out of RAM instead 
of Flash to operate properly. When I change the scatterloading file 
so that aes.o is loaded in RAM the program never branches to 
it...its like its not there!!
> When I check the map file generated by ADS it says the code is 
located in RAM.
>  
> Is there a way to set up the scatterloading file so that the 
routine is copied from Flash to RAM and executed from RAM?

Can I ask first if you have a main() function in your project? If 
you have, then the linker pulls in some C-startup code, which 
includes a section to move code and initialised data from their load 
positions (in Flash) to their execute positions in RAM.

If not, you have to write your own code snippets in the reset 
handler to move the code and data around. Conveniently, the linker 
will generate symbols giving you the load address, execution 
address, and length of each region to be moved. See page 4-2 of the 
Linker and Utilities guide, for a description of the format for 
these symbols.

HTH, Peter.

Hi Peter,
Thanks for the info....that solved the IAP issue!!Works prefectly now!
 
As regards the second problem/issue, The startup file Im using just initialises the exception vectors, stacks and branches to main(). Do I need another assembly routine to move the data from Flash to RAM?? I thought the scatterloading file set that up?
The problem I have is that any global variables or buffers in the code seem to cause the error! I can remove the problem by using local variables and passing them between functions but this is less than pretty!!!
 
Thanks,
David
 
 
 
 
 

Peter <fudd@...> wrote:
--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Thanks for the reply, Im using ARM ADS 1.2 to compile the code! 
Does anybody know how or if I have to turn on interworking for ADS?

Hi David, yes you need to turn on interworking, however this is done 
for you automatically if you create an application using the 
Thumb/ARM interworking template. This is convenient as you simply 
place source files to be built as ARM code in the ARM subproject, 
and the IDE takes care of all the other details.

Alternatively, you'll find the interworking tickbox in the project 
settings dialog, under the ATPCS tab when you select the assembler, 
ARM C compiler or Thumb C compiler. A major irritation (for me 
anyway) is that you have to set this for each subproject (Thumb and 
ARM), each target (Debug, DebugRel, Release) and each tool (asm, C, 
C++) that you use.

>  
> Also, I have a routine which has to be executed out of RAM instead 
of Flash to operate properly. When I change the scatterloading file 
so that aes.o is loaded in RAM the program never branches to 
it...its like its not there!!
> When I check the map file generated by ADS it says the code is 
located in RAM.
>  
> Is there a way to set up the scatterloading file so that the 
routine is copied from Flash to RAM and executed from RAM?

Can I ask first if you have a main() function in your project? If 
you have, then the linker pulls in some C-startup code, which 
includes a section to move code and initialised data from their load 
positions (in Flash) to their execute positions in RAM.

If not, you have to write your own code snippets in the reset 
handler to move the code and data around. Conveniently, the linker 
will generate symbols giving you the load address, execution 
address, and length of each region to be moved. See page 4-2 of the 
Linker and Utilities guide, for a description of the format for 
these symbols.

HTH, Peter.



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--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Hi Peter,
> Thanks for the info....that solved the IAP issue!!Works prefectly 
now!
>  
> As regards the second problem/issue, The startup file Im using 
just initialises the exception vectors, stacks and branches to main
(). Do I need another assembly routine to move the data from Flash 
to RAM?? I thought the scatterloading file set that up?
> The problem I have is that any global variables or buffers in the 
code seem to cause the error! I can remove the problem by using 
local variables and passing them between functions but this is less 
than pretty!!!
>  
> Thanks,
> David
>  

Hi David,

Excellent - glad the IAP is working now. For the scatterloading 
problem, try branching to __main instead of main. Have you also 
written your own version of __user_initial_stackheap, to tell the C 
startup code where to place the heap base and stack limit?

Peter.

No I was just using the startup file given with Keil's IDE for ADS...
 
Section of Startup.s
 
; Setup Stack for each mode
                LDR     R0, =Top_Stack
;  Enter Undefined Instruction Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_UND:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #UND_Stack_Size
;  Enter Abort Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_ABT:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #ABT_Stack_Size
;  Enter FIQ Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_FIQ:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #FIQ_Stack_Size
;  Enter IRQ Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_IRQ:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #IRQ_Stack_Size
;  Enter Supervisor Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_SVC:OR:I_Bit:OR:F_Bit
                MOV     SP, R0
                SUB     R0, R0, #SVC_Stack_Size
;  Enter User Mode and set its Stack Pointer
                MSR     CPSR_c, #Mode_USR
          MOV     SP, R0

; Enter the C code
                IMPORT  __main
                LDR     R0, =__main
                BX      R0

The gcc Startup files have the loop to move .data section and clear the .bss section before jumping to main so I assume there is a setting in ADS to do this automatically during assembly? Like I say, the code wont execute on anything with global variables....I get either random data or program crash and that it must be due to how im initializing the micro!
 
David.
 


Peter <pmaloy@...> wrote:
--- In lpc2000@yahoogroups.com, David Bermingham <crwpulsar@y...> 
wrote:
> Hi Peter,
> Thanks for the info....that solved the IAP issue!!Works prefectly 
now!
>  
> As regards the second problem/issue, The startup file Im using 
just initialises the exception vectors, stacks and branches to main
(). Do I need another assembly routine to move the data from Flash 
to RAM?? I thought the scatterloading file set that up?
> The problem I have is that any global variables or buffers in the 
code seem to cause the error! I can remove the problem by using 
local variables and passing them between functions but this is less 
than pretty!!!
>  
> Thanks,
> David
>  

Hi David,

Excellent - glad the IAP is working now. For the scatterloading 
problem, try branching to __main instead of main. Have you also 
written your own version of __user_initial_stackheap, to tell the C 
startup code where to place the heap base and stack limit?

Peter.





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> The gcc Startup files have the loop to move .data section and 
clear the .bss section before jumping to main so I assume there is a 
setting in ADS to do this automatically during assembly? Like I say, 
the code wont execute on anything with global variables....I get 
either random data or program crash and that it must be due to how 
im initializing the micro!
>  
> David.

Hmmm... the C startup code should move all the initialised data and 
zero the ZI (.bss) data for you. I can't see that Keil's IDE would 
be changing things. We had better take this offline, and post the 
fix back to the group (if appropriate) when we've sorted it out.

Peter.

Hi Peter...
This morning I compiled the code using the eval version of Crossworks and it works perfectly!! No problem with global variables, structures or anything, so think il get my work finished with Crossworks and then try to figure out what im doing wrong with ADS that is causing the problems!!!!
Thanks!
 
 

Peter <pmaloy@...> wrote:

> The gcc Startup files have the loop to move .data section and 
clear the .bss section before jumping to main so I assume there is a 
setting in ADS to do this automatically during assembly? Like I say, 
the code wont execute on anything with global variables....I get 
either random data or program crash and that it must be due to how 
im initializing the micro!
>  
> David.

Hmmm... the C startup code should move all the initialised data and 
zero the ZI (.bss) data for you. I can't see that Keil's IDE would 
be changing things. We had better take this offline, and post the 
fix back to the group (if appropriate) when we've sorted it out.

Peter.



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