Timer 1 ms with STR75 and Raisonance print

[xaviooo]

Posted on May 23, 2007 at 10:45

Timer 1 ms with STR75 and Raisonance print

[xaviooo]

Posted on May 22, 2007 at 15:21

Hello everybody,

I'm trying to create a 1ms timer with a STR750 microcontroller.

void TB_Configuration(void)

{

/* TB configuration in Timing mode */

TB_InitStructure.TB_Mode = TB_Mode_Timing;

TB_InitStructure.TB_ClockSource = TB_ClockSource_CKTIM;

TB_InitStructure.TB_Prescaler = 29; /* TB clock = 60MHz / (29 +1) = 2 MHz*/

TB_InitStructure.TB_CounterMode = TB_CounterMode_Up;

TB_InitStructure.TB_AutoReload = 19; /* update each: 2 MHz/(19+1)= 100 KHZ ---> 10 us */

TB_Init(&TB_InitStructure);

TB_ITConfig(TB_IT_Update, ENABLE);/* Enable TB update interrupt */

TB_Cmd(ENABLE); /* Enable TB counter */

}

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

.... //EIC ENABLE

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

void TB_IRQHandler(void)

{

INC_10us++;

TB_ClearITPendingBit(TB_IT_Update);

}

Works

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

void WaitClock(u16 time)

{

while (INC_10us < time)

{

Here is the problem

print('' INC_10us: %d \r'',INC_10us);[/B] // Raisonance print

}

INC_10us = 0; //Reset counter

}

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

main

{

... // INIT

while(1)

{

WaitClock(100); // Wait 10 * 100us = 1ms

}

}

Problem

In the function WaitClock, when I don't use the function print, i'm stuck in the while of the function.

When I use the function print, it works, but the timer is a 20 ms timer instead of a 1 ms timer.

Of course, I'd prefer not to use the function print.

Is there an obvious mistake ?

Did anyone have the same problem ?

Thank you again.

-Xavier

[xaviooo]

Posted on May 23, 2007 at 10:45

Well,

First problem solved : print function takes too long :-? .

I have a 1 ms timer:).

Second problem :

This works... but it's ugly... It's the best I can do for now?

-------------------------------------------------

void WaitClock(u16 time)

{

while (INC_10us < time)

{

Here is the problem

GPIO_WriteBit(GPIO0, GPIO_Pin_4, 0);

}

INC_10us = 0; //Reset counter

}

-------------------------------------------------

Why this doesn't work ?:

void WaitClock(u16 time)

{

while (INC_10us < time);

INC_10us = 0; //Reset counter

}