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Providing Delay Using Timer

Saurabh Yadav over 13 years ago

HI,

I am using STR91x

I wish to provide delay using timer in my program.

while studying the timer i came to know in str91 there are different modes like OC,IC.

(I am not using PWM mode).What does they meant for,which one is suitable for giving a delay.

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0 Saurabh Yadav over 13 years ago

Guys,

I got the way,


 TIM_InitStructure.TIM_Clock_Source = TIM_CLK_APB;
 TIM_InitStructure.TIM_Mode = TIM_OCM_CHANNEL_1;   // OUTPUT COMPARE CHANNEL 1 Mode
 TIM_InitStructure.TIM_Prescaler = 0xFF;
 TIM_InitStructure.TIM_OC1_Modes = TIM_TIMING;     //Timing mode
 TIM_InitStructure.TIM_Pulse_Length_1 = 0xFFEE;      // .67s period
 TIM_Init(TIM0, &TIM_InitStructure);

the above calculation
IRQ handler is written in the following way


void TIM0_IRQHandler(void)
{
  GPIO_Write(GPIO3,0x00);
  TIM_CounterCmd(TIM0, TIM_CLEAR);
  // Clear TIM0 flag OC1
  TIM_ClearFlag(TIM0,TIM_FLAG_OC1);
}

using this i m getting my LED glows every .67sec.

now if i wish to toggle the led for example say 3 minutes so what i m supposed to do.

i can get the counter value using the standard function specified.

Tell me if this kind of coding is a gud practise

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