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FreeRTOS on MSP430 using IAR interrupts probl

Posted by Mario Huizar on June 2, 2010
Hello all,

I am using the FreeRTOS on a MSP430FG439 and I want to use the Uart0 but because the Free RTOS on the file portext.s43 redefine the INTVEC I am having problems...
The FreeRTOS needs the timer0 to define the "tick" of the OS. And it defines it in assembler like this:

ASEG
ORG 0xFFE0 + TIMERA0_VECTOR

_vTickISR_: DC16 vTickISR

I was having the following error:

Error[e16]: Segment INTVEC (size: 0x14 align: 0x1) is too long for segment definition. At least 0x2 more bytes needed. The problem occurred while processing the
segment placement command "-Z(CODE)INTVEC=FFE0-FFFF", where at the moment of placement the available memory ranges were "CODE:ffe0-ffeb,CODE:ffee-ffff"
Reserved ranges relevant to this placement:
ffe0-ffeb INTVEC
ffec-ffed Absolute code from TICK_ISR
ffee-ffff INTVEC

Now what I did was to redefine the INTVEC as a Common segment like this:

COMMON INTVEC(1) ; Interrupt vectors
ORG TIMERA0_VECTOR
_vTickISR_: DC16 vTickISR

But now the linker complains with:


Linking
Error[e46]: Undefined external "?cstart_init_copy" referred in port ( C:\Users\Mario\Documents\MasterArbeit\Lifebridge\Supervisor\Demo\msp430_IAR\Debug\Obj\
port.r43 )
Error[e46]: Undefined external "?cstart_init_zero" referred in tasks ( C:\Users\Mario\Documents\MasterArbeit\Lifebridge\Supervisor\Demo\msp430_IAR\Debug\Obj\
tasks.r43 )
Error while running Linker

Any ideas?

Thanks!
Mario Huizar

RE: FreeRTOS on MSP430 using IAR interrupts probl

Posted by Dave on June 2, 2010
Sorry, no ideas, but FreeRTOS can use any suitable timer if it is the actual timer it is using that is the issue.

RE: FreeRTOS on MSP430 using IAR interrupts probl

Posted by Mario Huizar on June 2, 2010
Thanks I already found the solution.. Although I do not know exactly what it was.
I think it was a bad configuration setting on the project.
I added this Common INTVEC instruction and it actually worked.


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