Hardfault exception error

May i know what is the exact cause of this.

You may. Use the debugger and find the point where the HardFault is triggered.

Peripherals->Core peripherals->Fault reports

I have a delay function in while loop. When this delay function is executing it goes to void xPortSysTickHandler( void ), it executes few instructions, then it goes to
__asm void vPortSetInterruptMask( void )

{ PRESERVE8

push { r0 } mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY msr basepri, r0 pop { r0 } bx r14
}

it executes this then void vTaskIncrementTick( void ) is done.
then it goes to

__asm void vPortClearInterruptMask( void )

{ PRESERVE8

push { r0 } mov r0, #0 msr basepri, r0 pop { r0 } bx r14
} then it goes to

__asm void xPortPendSVHandler( void )

{ extern uxCriticalNesting; extern pxCurrentTCB; extern vTaskSwitchContext;

PRESERVE8

-----> mrs r0, psp

ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */ ldr r2, [r3]

stmdb r0!, {r4-r11} /* Save the remaining registers. */ str r0, [r2] /* Save the new top of stack into the first member of the TCB. */

stmdb sp!, {r3, r14} mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY msr basepri, r0 bl vTaskSwitchContext mov r0, #0 msr basepri, r0 ldmia sp!, {r3, r14}

ldr r1, [r3] ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */ ldmia r0!, {r4-r11} /* Pop the registers and the critical nesting count. */ msr psp, r0 bx r14

nop
}

i have show arrow in above code, from that is executes. When it executes nop instruction at last it jumps to Hardfault exception.

i guess while poping it is going to some different location.

Do help me out please

May i know sir what do you mean by Peripherals->Core peripherals->Fault reports?

Is it that i have initialized GPIO pins so it is giving error?

May i know sir what do you mean by Peripherals->Core peripherals->Fault reports?

Look at uv4's menu bar and you'll get it.
And yet, maybe your GPIO block is not powered. That can lead to a hard fault.

Peripherals->Core peripherals->Fault reports?
i checked in bar menu. in that HARD_FAULT_STAT: 0x40000000 and forced option is ticked when i debug.
Should i make it zero?
what does this mean?

Should i make it zero?

NO !

what does this mean?

Read a cortex M3 architecture document and your chip's user manual.

Sir what changes should i make to resolve my error. My GPIO is set properly when i check in debug.
please do help

please do help

How can I? I am not telepathic. I would argue that no one here is. Debug it -> solve it.

Have you made sure you don't have a stack overflow, and don't have a memory overrun, and don't make use of any uninitialized pointers or index variables?

After all - debugging is a significant part of programming.

thank u all..
finally it worked...
have to do few changes in freertos code..

have to do few changes in freertos code..

Probably the wrong solution, unless it is a change to the ported code !

Its not wrong..
did one change in port.c file