Posted on October 12, 2013 at 18:10
I want to write function using timer 2 for have millisecond in STM32F103 I just don't know why this doesn't work!
TIMER2 config:
void config_TIM2()
{
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
/* Enable the TIM2 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = TIM_CKD_DIV1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
/* Initialize TIM2 Interrupt */
NVIC_Init(&NVIC_InitStructure);
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* Time base configuration */
TIM_TimeBaseInitStructure.TIM_Period = 360 - 1;
TIM_TimeBaseInitStructure.TIM_Prescaler = 10 - 1;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
/* Initialize TIM2 */
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
/* TIM IT enable */
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
/* TIM2 enable counter */
TIM_Cmd(TIM2, DISABLE);
}
here I count down each milliseconds :
void TIM2_IRQHandler()
{
TIM_ClearITPendingBit(TIM2, TIM_FLAG_Update);
ntime--;
}
Here wait until nms milliseconds
void delay_ms(u16 nms)
{
ntime = nms;
TIM_Cmd(TIM2, ENABLE);
while (ntime);
TIM_Cmd(TIM2, DISABLE);
}
#timer #stm32 #interrupts
