Posted on May 17, 2011 at 09:42Hi MariuszS,
I use this code to generate a 10mSec interrupt:
>>>>>> This code goes in the setup part:
// TIM0 Structure Initialization ---------------------------------------------
/* Timer calculation:
Period = (t * fPCLK / tPRESC) - 5
Where:
t = Desired output compare period (seconds)
fPCLK = Internal clock frequency
tPRESC = Timer clock prescaler
Ex: Period = (0.01 * 48Mhz / 256) - 5 = 0x74E
*/
TIM_StructInit(&TIM_InitStructure);
TIM_InitStructure.TIM_Mode = TIM_PWM;
TIM_InitStructure.TIM_Clock_Source = TIM_CLK_APB;
TIM_InitStructure.TIM_Prescaler = 0xFF;
TIM_InitStructure.TIM_Pulse_Level_1 = TIM_HIGH;
TIM_InitStructure.TIM_Period_Level = TIM_LOW;
TIM_InitStructure.TIM_Pulse_Length_1 = 0xFF;
TIM_InitStructure.TIM_Full_Period = 0x74E; //0xFFF max value for 22mSec
TIM_DeInit(TIM0);
TIM_Init (TIM0, &TIM_InitStructure);
TIM_ITConfig(TIM0, TIM_IT_TO, ENABLE); // Enable the Timer Overflow interrupt
TIM_CounterCmd(TIM0, TIM_START); // Start the Timer0 counter
// VIC configuration ---------------------------------------------------------
VIC_DeInit();
VIC_Config(TIM0_ITLine, VIC_IRQ, 4);
VIC_ITCmd(TIM0_ITLine, ENABLE);
>>>>>> This code goes in the ''91x_it.c'' file:
void TIM0_IRQHandler(void)
{
TIM0_IRQHandlerInvoked();
}
>>>>>> This code goes in the subroutine called by the interrupt:
/*******************************************************************************
* Function Name : TIM0_IRQHandlerInvoked
* Description : this routine is invoked when the Timer0 has generated an
* interrupt
*******************************************************************************/
void TIM0_IRQHandlerInvoked(void)
{
TIM_ClearFlag(TIM0, TIM_FLAG_TO); //Clear the TIM_TO flag for the next interrupt
if(pulse)
{
GPIO_WriteBit(GPIO6, GPIO_Pin_1, Bit_SET);
GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET);
pulse = 0;
}
else
{
GPIO_WriteBit(GPIO6, GPIO_Pin_1, Bit_RESET);
GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);
pulse = 1;
}
}
I just toggle Leds when the interrupt happens. I hope this will help you.
Mark
