This error makes no sense to me. It must be trivial, but I am stumped.

gideon prior

Hello all, I am getting a compiler error saying " error:expected a declaration". It sounds like I have not declared a variable as a type. I have declared a variable as 'int usePI = 0;' and then later in the code I have if(usePI){ several lines of code }. The if(usePI) line is where the compiler complains about a declaration, but I have declared it. I am pasting the code up to where the error happens below. I am using CCS 3.3.59.4 and the TI IDE v 5.98.0.339, BIOS 5.32 I appreciate any help. Thanks

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File
#include "SineTable.h"  // Contains look-up table used in Clarke-Park transforms
#include "ClarkePark.h"  // Include header for the CLARKEPARK object
#include "PosSpeed.h"  // Header for QEP and Speed
#include "PIController.h" // Header for PI controller
#include "CLF.h"            // Header for Control Lyapunov Function Controller
#include "InvParkClarke.h"  // Header for Inverse Park Transform
#include "SpaceVectorMod.h" // Header for Space Vector Modulation
#include "PWM.h"   // Header for PWM update
const float SYSTEM_FREQUENCY = 150;   // System clock (MHz)
const float ISR_FREQUENCY = 5; // Sample frequency (kHz)

// Configure which ePWM timer interrupts are enabled at the PIE level:
#define PWM1_INT_ENABLE 1

// Configure the period for each timer
#define PWM1_TIMER_TBPRD 0x1FFF

// Configure ADC
#define ADC_usDELAY 5000L
#define ADC_CKPS 0x1 // ADC module clock = HSPCLK/2*ADC_CKPS = 25.0MHz/(1*2) = 12.5MHz
#define ADC_SHCLK 0xf // S/H width in ADC module periods = 16 ADC clocks
#define Volt_Scale 45.77637e-6 // Scale factor for volts
#define Volt_Offset -1.5
#define Current_Scale 0.0443

// Prototype statements for functions found within this file.
interrupt void FOC_isr(void);
void InitEPwmTimer(void);

// Global variables used in this example
float CurrentPhase1;
float CurrentPhase2;
float rotorangle;
float speedRef = 1;
float IdRef = 0;
long loopcnt = 0;
int usePI = 0; //set to one for PI control

// Instance objects
CLARKEPARK clarkpark = CLARKEPARK_DEFAULTS;
POSSPEED qep_posspeed = POSSPEED_DEFAULTS;
if(usePI){
PICONTROLLER pi_speed = PICONTROLLER_DEFAULTS;
PICONTROLLER pi_Id = PICONTROLLER_DEFAULTS;
PICONTROLLER pi_Iq = PICONTROLLER_DEFAULTS;
}
else{

CLF clf = CLF_DEFAULTS;

}

//More code here ...

over 15 years ago

0 AartiG over 15 years ago

TI__Guru**** 173310 points

Is the if/else code within the context of a function? It should work if it is within a function.

You can use #if/#else/#endif preprocessor conditionals in place of the if/else if you want these evaluated during preprocessing.

0 George Mock over 15 years ago

TI__Guru**** 249440 points

Try the option -pdv (verbose diagnostics). That usually helps situations like this. See slide 27 of this presentation http://tiexpressdsp.com/index.php/CGT_Tips_%26_Tricks_for_Beginners .

Thanks and regards,

-George

0 Archaeologist over 15 years ago

TI__Guru* 84285 points

"expected a declaration" does not mean that the variable is undefined, it means that the compiler expected a declaration for a function or variable instead of an if-statement. Most likely your code is not enclosed within a function; you can't put statements at the global scope. Even if you were to enclose it in a function, the contents of the if would declare some variables that would never be usable elsewhere. You probably meant to use an #ifdef preprocessor directive instead of an if-statement. You can't refer to a declared variable in such an if statement, so you'll also have to make usePI a preprocessor macro, too.

#define usePI 0
#if usePI
PICONTROLLER pi_speed = PICONTROLLER_DEFAULTS;
PICONTROLLER pi_Id = PICONTROLLER_DEFAULTS;
PICONTROLLER pi_Iq = PICONTROLLER_DEFAULTS;
#else
CLF clf = CLF_DEFAULTS;
#endif

Code Composer Studio™︎

Code Composer Studio forum

This error makes no sense to me. It must be trivial, but I am stumped.