CCS/MSP430FR6989: Use C Function Parameter in inline Assembler MSP430FR6989

Al Lev

Prodigy 250 points

Part Number: MSP430FR6989

Tool/software: Code Composer Studio

Hallo.

I have C Function with two Parameter:

void FunctionTest (uint16_t *const timerName, uint8_t channel)

{

asm("mov.b channel, r13") ; //Value channel in R13

asm("mov.w timerName, r15") ; //Value timerName in R15

}

I want to write Function Input Parameters in CPU Register. But I get Errors. How can I get Funktion Parameters in CPU Register in likebel way?

Do you know TI Dokuments that describes handling from MSP430FR6989 C and Assembler and both together and Assembler Commands?

Thanks in Adwance

Alex

over 5 years ago

0 George Mock over 5 years ago

TI__Guru**** 249390 points

Al Lev said:
How can I get Funktion Parameters in CPU Register in likebel way?

Unfortunately, it is not possible for asm statements to access C variables like timerName and channel. Please search the MSP430 compiler manual for the sub-chapter titled The __asm Statement.

Thanks and regards,

-George

0 Al Lev over 5 years ago in reply to George Mock

Prodigy 250 points

Hello George.

Thanks for the Information. And you don't know any method or example to get function Parameter in CPU Register from C Function

using asm?

best regards

Alex

0 George Mock over 5 years ago in reply to Al Lev

TI__Guru**** 249390 points

Al Lev said:
you don't know any method or example to get function Parameter in CPU Register from C Function

Not directly. No. That said, here are two alternatives to consider.

One ... Write the function entirely in hand-coded assembly. For help with that, please search the MSP430 compiler manual for the sub-chapter titled Interfacing C and C++ With Assembly Language.

Two ... Use compiler intrinsics. They look and act like function calls. But no function is called. Instead, a few assembly instructions are emitted. In many cases, just one instruction is emitted. For the list of available intrinsics, please search the MSP430 compiler manual for the sub-chapter titled Using Intrinsics to Access Assembly Language Statements.

Thanks and regards,

-George

0 Al Lev over 5 years ago in reply to George Mock

Prodigy 250 points

Nothing to add

regards

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CCS/MSP430FR6989: Use C Function Parameter in inline Assembler MSP430FR6989