Posted on July 31, 2013 at 22:17Hello,
I don't know if my understanding of NVIC is correct especially to System Tick Timer.
&sharpinclude ''stm32f10x.h''
void NVIC_Configuration(void)
{
uint32_t priorityGroup; /* Variables to store priority group and priority */
uint32_t priority;
NVIC_SetPriorityGrouping(1); /* 1 bits for pre-emption priority, 3 bits for subpriority */
priorityGroup = NVIC_GetPriorityGrouping(); /* Get used priority grouping */
priority = NVIC_EncodePriority(priorityGroup, 1, 3); /* Encode priority with 3 for subpriority and 1 for preempt priority */
NVIC_SetPriority(ADC1_2_IRQn, priority); /* Set new ADC1_2_IRQn priority */
NVIC_EnableIRQ(ADC1_2_IRQn); /* Enable ADC Interrupt */
priority = NVIC_EncodePriority(priorityGroup, 1, 1); /* Encode priority with 1 for subpriority and 1 for preempt priority */
NVIC_SetPriority(TIM1_CC_IRQn, priority); /* Set new TIM1_CC_IRQn priority */
NVIC_EnableIRQ(TIM1_CC_IRQn); /* Enable Timer1 CC4 Interrupt */
priority = NVIC_EncodePriority(priorityGroup, 1, 2); /* Encode priority with 2 for subpriority and 1 for preempt priority */
NVIC_SetPriority(TIM2_IRQn, priority); /* Set new TIM2_IRQn priority */
NVIC_EnableIRQ(TIM2_IRQn); /* Enable Timer1 CC4 Interrupt */
/* TIM4_IRQn should preempt all other interrupt (Highest Priority)*/
priority = NVIC_EncodePriority(priorityGroup, 0, 0); /* Encode priority with 0 for subpriority and 0 for preempt priority */
NVIC_SetPriority(TIM4_IRQn, priority); /* Set new TIM4_IRQn priority */
NVIC_EnableIRQ(TIM4_IRQn); /* Enable Timer1 CC4 Interrupt */
//NB: My main code does not work if I include the below section and Systick_Configuration(void) in main
//Systick interrupt does nothing in my main code. Adding or Removing Systick interrupt supposed not to affect it
//functionality.I just wanted to test my understanding of NVIC
/* SysTick_IRQn lowest Priority */
priority = NVIC_EncodePriority(priorityGroup, 1, 6); /* Encode priority with 6 for subpriority and 1 for preempt priority */
NVIC_SetPriority(SysTick_IRQn, priority); /* Set new SysTick_IRQn priority */
NVIC_EnableIRQ(SysTick_IRQn); /* Enable SysTick_IRQn Interrupt */
}
void Systick_Configuration(void)
{
if (SysTick_Config(SystemCoreClock / 1000)) //2KHz
{
/* Capture error */
while (1);
}
}
void SysTick_Handler(void)
{
GPIOB->ODR ^= (1 << 8);
}
int main(void)
{
Systick_Configuration();
NVIC_Configuration();
RCC_Configuration(); //Configure System Peripherals Clock
GPIO_Configuration(); //Configure Input & Output Pins
ADC1_2_Configuration(); //Configure ADC1_2 in Dual Simultanous Sampling on a Single Channel
PWM_Configuration(); //Configure Timer1 for 25KHz Independent Complementary PWM
TIM4_Configuration();
TIM3_Configuration(); //Configure & Start Timer3 for Alignment and StartUp Phase
TIM2_Configuration();
StartMotor(); //Start Motor
while(1)
{
//Configure USART to Send and Receive Important Motor Details
}
}
#nvic #stm32
