topic MC56F8002 interrupt reset MCU in Digital Signal Controllers

MC56F8002 interrupt reset MCU

jean-francoisle — Wed, 29 Apr 2015 19:39:25 GMT

Hi,

Code warrior 8.3.

I started a projet on MC56F8002 based on an old code. With the new silicon revision, the MCU is not working properly. After a debugging session, I realized that the MCU reset when an interrupt occurs. If I don't activate interrupts, the MCU do not reset. Here is the line to enable the interrupt __EI(0);. On the old silicon revision (mask 1M53M) there is no problem with interrupts.

Any suggestion?

Re: MC56F8002 interrupt reset MCU

johnlwinters — Wed, 29 Apr 2015 19:45:08 GMT

Make sure the interrupt vectors are located up at the correct Address and that your startup code is telling the core that the vectors are up there. The 8006 has vectors at amuck lower address.

Best Regards,

John L. Winters

Senior Applications Engineer

AMR/EU MCU & MPU AE Group

Freescale Inc.

2100 Elliot Road

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Re: MC56F8002 interrupt reset MCU

jean-francoisle — Wed, 29 Apr 2015 19:52:27 GMT

Hi,

I don't know this MCU. How can I do to verify the interrupt vector address? I suppose this address in define in the linker file (.cmd)

.p_Interruptsboot (RWX) : ORIGIN = 0x00001000, LENGTH = 0x0004

.p_Interrupts (RWX) : ORIGIN = 0x00001000, LENGTH = 0x000000CC

How to configure the startup code? Is it in the 56F80xx_int.asm? What I have to do?

/////////////////////////////////////////////////

section startup

XREF F_stack_addr

XREF F_xROM_to_xRAM

XREF F_pROM_to_xRAM

XREF F_Ldata_size

XREF F_Ldata_ROM_addr

XREF F_Ldata_RAM_addr

org p:

GLOBAL Finit_56800_

/////////////////////////////////////////////////

Thanks for your help.

Re: MC56F8002 interrupt reset MCU

jean-francoisle — Wed, 29 Apr 2015 20:26:34 GMT

I got it.

In function _EntryPoint() I had this line: INTC_VBA = (int)&_vba >>7;

In the variable declaration section in this file, I put this line: extern unsigned int _vba;

In the linker file, I add the line in bold.

.interrupt_vectors :

{

# interrupt vectors

F_vba = .;

* (interrupt_vectors.text) }

>.p_Interrupts

Seems to work properly. I'm doing test.

Regards.