Math Functions

Development Boards MicroMod
1

I’m having trouble getting some math functions to work in CCS. I can get the basic sin cos, etc. to work but not having any luck with pow(). Can someone shed some light on this?

How do I get the IDE to recognize the functions when I type them in? Is there a setting for that?

2

kaye7877:
I’m having trouble getting some math functions to work in CCS. I can get the basic sin cos, etc. to work but not having any luck with pow(). Can someone shed some light on this?

How do I get the IDE to recognize the functions when I type them in? Is there a setting for that?

If you post your code and/or the compiler error it would be much easier to help you.

Have you added an #include statement for the relevant libraries?

3

I gave up and changed the code so I don’t have the original. I’m sure it is something I am not doing correctly.

I did include

math.h

float.h

The variables were also double as described in the header file.

Why, when I include them, do the functions not highlight in my CCS editor either?

I’ll make some basic code and try it again and post the code.

4

The sin function works just fine. When I add the pow function in, the compiler gives me the following errors

errors encountered during linking; “Project010MathFunctions.out” not built

placement fails for object “.text”,

placement fails for object “.text”, size 0xa2e (page 0). Available ranges: FLASH size: 0x7e0 unused: 0x7b6 max hole: 0x7b6

// Written on CCS 4.x

//*****************************************************************************

#include “msp430g2211.h”

#include “float.h”

#include “math.h”

volatile float fTest = 0;

volatile double dTest = (45 * 3.1415926 / 180);

volatile double dResult1;

volatile double dResult2;

volatile double a = 2;

volatile double b = 2;

const unsigned int ctest = 100;

void main(void)

{

WDTCTL = WDTPW + WDTHOLD; // Hold watchdog timer.

// Port setups.

// Port 1 P1.3 is already wired to a SMD switch SW2.

P1DIR = 0xFF - BIT3; // Pins to be outputs

P1IE = BIT3;

P1OUT = 0;

// GIE must be enabled to allow any ISR to work. Can also be set by

// the command _enable_interrupts(void) and intrinsics.h must be included

_BIS_SR(GIE); // interrupt

for(;:wink:

{

}

}

// Interrupt service routine for Port 1

#pragma vector = PORT1_VECTOR

__interrupt void Port_1(void)

{

_BIC_SR(GIE); // Dis-allow interrupts

P1IFG = 0;

dResult1 = sin(dTest);

dResult2 = pow(a,b);

_BIS_SR(GIE); // interrupt

}

5

kaye7877:
The sin function works just fine. When I add the pow function in, the compiler gives me the following errors

errors encountered during linking; “Project010MathFunctions.out” not built

placement fails for object “.text”,

placement fails for object “.text”, size 0xa2e (page 0). Available ranges: FLASH size: 0x7e0 unused: 0x7b6 max hole: 0x7b6

The linker is telling you that you are trying to fit a square peg into a round hole. (code too big for memory)

Either redesign your code to control its size (avoiding library calls is good) or move to a part with more memory.

6

Thank you…