Interrupts are not responding on ARM core

Mitul Shinde

Other Parts Discussed in Thread: OMAPL138, OMAP-L138

Hi,
I am using OMAPL-138 custom board in our project. We are facing critical issue with ARM core interrupt. ARM core is not allow any peripheral interrupt to host. TI provided sample codes for each peripheral. When I load any sample project on DSP core it's working fine. Interrupts are working with DSP code but same project I load on ARM core I am getting any interrupt from any peripheral.

Regards this issue,

I noticed that processor do not allow to configure PINMUX registers because of processor is operate in user mode after startup. I am trying to change user mode to supervisor mode but in built CSS ARM library does not allow any change. Please suggest and do needful to change processor mode from user mode to supervisor mode.

This is the following code which is reside in boot.asm library file.

;*------------------------------------------------------

;* SET TO USER MODE

;*------------------------------------------------------

MRS r0, cpsr

BIC r0, r0, #0x1F ; CLEAR MODES

ORR r0, r0, #0x10 ; SET USER MODE <--------------------------------------- I want to change this value to #0x13

MSR cpsr_cf, r0

;*------------------------------------------------------

;* INITIALIZE THE USER MODE STACK

;*------------------------------------------------------

.if __TI_AVOID_EMBEDDED_CONSTANTS

MOVW sp, __stack

MOVT sp, __stack

MOVW r0, __STACK_SIZE

MOVT r0, __STACK_SIZE

.else

LDR sp, c_stack

LDR r0, c_STACK_SIZE

.endif

ADD sp, sp, r0

;*-----------------------------------------------------

;* ALIGN THE STACK TO 64-BITS IF EABI.

;*-----------------------------------------------------

Also,

I noticed that IRQ bit in CPRS register is set(means IRQ is disable). Usually what should be the status for this bit while execution of application program.

Please do needful for this issue.

Regards,

Mitul Shinde

over 7 years ago

0 Shankari G over 7 years ago

TI__Mastermind 43955 points

Hi Mitul Shinde,
What package and example are you testing on your custom board ?

The UART example based on interrupts.
C:\ti\OMAPL138_StarterWare_1_10_04_01\examples\lcdkOMAPL138\uart

Use the following link to import the ARM based UART project in CCS.
C:\ti\OMAPL138_StarterWare_1_10_04_01\build\armv5\cgt_ccs\omapl138\lcdkOMAPL138\uart

0 Mitul Shinde over 7 years ago in reply to Shankari G

Prodigy 130 points

Hi Shankari,

Thanks for reply. We have OMAP-L138 package and trying to run same example code for UART what you mentioned on your reply.

Regards,
Mitul Shinde

0 Shankari G over 7 years ago in reply to Mitul Shinde

TI__Mastermind 43955 points

Hi Mitul Shinde,

Please make sure that you have included the following library into your project.

C:\ti\OMAPL138_StarterWare_1_10_04_01\binary\armv5\cgt_ccs\omapl138\system_config\Debug\system_config.lib

Also you should use the following linker command file which says that "system_config.lib" has the entry point.

-stack 0x8000 /* SOFTWARE STACK SIZE */

-heap 0x2000 /* HEAP AREA SIZE */

-e Entry

/* SPECIFY THE SYSTEM MEMORY MAP */

MEMORY

{

DDR_MEM : org = 0xC1080000 len = 0x2F7FFFF /* RAM */

}

/* SPECIFY THE SECTIONS ALLOCATION INTO MEMORY */

SECTIONS

{

.init : {

system_config.lib<init.obj> (.text)

} load > 0xC1080000

.text : load > DDR_MEM /* CODE */

.data : load > DDR_MEM

.bss : load > DDR_MEM /* GLOBAL & STATIC VARS */

RUN_START(bss_start),

RUN_END(bss_end)

.const : load > DDR_MEM /* SOFTWARE SYSTEM STACK */

.cinit : load > DDR_MEM /* SOFTWARE SYSTEM STACK */

.stack : load > 0xC3FF7FFC /* SOFTWARE SYSTEM STACK */

0 Mitul Shinde over 7 years ago in reply to Shankari G

Prodigy 130 points

HI Shankari,

Thanks a lot for kind support. I followed above steps you have mentioned now it's working.

Regards,
Mitul Shinde

0 Shankari G over 7 years ago in reply to Mitul Shinde

TI__Mastermind 43955 points

Hi Mitul Shinde,
You are welcome.
Thanks for the update.

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Interrupts are not responding on ARM core