ISR not entered (52259 board)

MangoBot — Tue, 02 Oct 2012 08:57:11 GMT

Hello ,

It's 52259-based Tower Mechatronics board.

We use DTIM0 to generate interrupt by following codes :

MCF_DTIM0_DTRR = (1000000);

MCF_DTIM0_DTMR = 0

| MCF_DTIM_DTMR_PS(SYS_CLK_MHZ)

| MCF_DTIM_DTMR_ORRI

| MCF_DTIM_DTMR_FRR

| MCF_DTIM_DTMR_CLK_DIV1

| MCF_DTIM_DTMR_RST;

// Setup the interrupt controller registers for DTIM0

MCF_INTC0_ICR19 = MCF_INTC_ICR_IL(7) | MCF_INTC_ICR_IP(7);

MCF_INTC0_IMRL &= ~(MCF_INTC_IMRL_INT_MASK19 | MCF_INTC_IMRL_MASKALL);

ISR is defined :

__declspec(interrupt) void dtim0_handler_1(void)

{

printf("\n------------->>> DTIM0 <<<---------------\n");

/* Clear the interrupt event */

MCF_DTIM0_DTER |= MCF_DTIM_DTER_REF;

}

and vectors.s will define the VECTOR_TABLE.

During initialization, VBR will be written :

/* Copy the vector table to RAM */

for (n = 0; n < 256; n++)

__VECTOR_RAM[n] = VECTOR_TABLE[n];

mcf5xxx_wr_vbr((uint32)__VECTOR_RAM);

mcf5xxx_wr_vbr:

_mcf5xxx_wr_vbr:

move.l 4(SP),D0

.long 0x4e7b0801 /* movec d0,VBR */

nop

rts

We find interrupt is successfully triggered but ISR is not entered.

We check in debugger to see ISR address of dtim0_handler_1 has been correctly copied to __VECTOR_RAM.

Wondering why ISR is not entered?

Kind advices are appreciated.

Best Regards,

Re: ISR not entered (52259 board)

MangoBot — Wed, 07 Nov 2012 04:21:29 GMT

found modify mcf5xxx_wr_vbr can solve it, as advised in https://community.freescale.com/message/89618#89618 , due to porting old codes to newer compiler of CW10.2