Posted on May 17, 2011 at 09:31/* This function for STR9 */
void ToggleLed(void)
{
static int ledv=0;
ledv^=1;
GPIO7->DR[0x3FC] =ledv;
}
void FuncTest(void)
{
register int ToggleCounter=10000000;
volatile register int Val2=0;
volatile register int Val3=0;
volatile register int Val4=0;
volatile register int Val5=0;
volatile register int Val6=0;
volatile register int Val7=0;
volatile register int Val8=0;
volatile int Val9=0;
volatile int Val10=0;
volatile int Val11=0;
volatile int Val12=0;
volatile int Val13=0;
volatile int Val14=0;
volatile int Val15=0;
volatile int Val16=0;
volatile int Val17=0;
volatile int Val18=0;
volatile int Val19=0;
for(;;)
{
while (ToggleCounter--)
{
++Val2;
++Val3;
++Val4;
++Val5;
++Val6;
++Val7;
++Val8;
++Val9;
++Val10;
++Val11;
++Val12;
++Val13;
++Val14;
++Val15;
++Val16;
++Val17;
++Val18;
++Val19;
}
ToggleLed();
ToggleCounter=10000000;
}
}
I run this test with IAR EWARM compiler. For STR9, I get 31.2 sec if app. is running from Flash, 18.3 second if application is running from ram. (with __runfunc ) I used variables (val2 to val19) to run the code in linear way as possible. The Ewarm produce a nice ''load , increment and store'' (3 instruction ) for ++Valxx . I did this way in order to see the real flash performance, because jumps are generally decrease the performance of the flash with prefetch mechanism. I used EWARM as compiler,because I could not be able to run my code from RAM with the compiler comes with STR9 Keil Evaluation board (MCB-STR9).
My initialize code for the EWarm:
void SCU_Configuration(void)
{
/* Enable the __GPIO7 */
SCU_APBPeriphReset(__GPIO7,DISABLE);
SCU_APBPeriphClockConfig(__GPIO7 ,ENABLE);
}
GPIO_InitTypeDef GPIO_InitStructure;
void main()
{
SCU_Configuration();
SCU_MCLKSourceConfig(SCU_MCLK_OSC);
SCU_RCLKDivisorConfig(SCU_RCLK_Div1);
SCU_HCLKDivisorConfig(SCU_HCLK_Div1);
FMI_Config(FMI_READ_WAIT_STATE_3,FMI_WRITE_WAIT_STATE_0, FMI_PWD_ENABLE,
FMI_LVD_ENABLE,FMI_FREQ_HIGH);
SCU_PLLFactorsConfig(192,25,2); /* PLL = 96 MHz */
SCU_PLLCmd(ENABLE); /* PLL Enabled */
SCU_MCLKSourceConfig(SCU_MCLK_PLL); /* MCLK = PLL */
SCU->GPIOOUT[7]=0x5555;
GPIO7->DDR=0xff;
FuncTest();
}
Best regards,
