Posted on January 19, 2015 at 06:54Basically what my problem is Once I de-init the Timer after a successful operation I'm not able to re-init it again...
I am writing a program to generate a delay using timer whose delay canbe varied according to the user defined value. But for the First timeI'm able to generate the desired delay but Once I de-initialize I'm notable to reinitialize the timer again
void TIM2_irq(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
count++;
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
if(count == Max_Cnt )
{
flag=1; //Once the defined count is reached set the flag
TIM_DeInit(TIM2);
//Deinitialise the Timer
}
}
}
void delay_using_TIM(float delay_val)
{
Max_Cnt = delay_val *10;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* Enable the TIM2 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 5;
TIM_TimeBaseStructure.TIM_Prescaler = 0x410; // Verfied 100 microsec for timer expiry
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* TIM IT enable */
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
while(!flag);
flag=0;
}
int main()
{
while(1)
{
GPIO_SetBits(GPIOB, GPIO_Pin_6); //Gpio is already initialised
delay_js(6.2);
GPIO_ResetBits(GPIOB, GPIO_Pin_6);
rtos_delay_milliseconds(10);
}
}
Is this the proper way of de-initializing the Timer ?
Please help
#stm32f4 #discovery #stm32f2 #timers
