Reputation: 11
#include "Main.h"
#define MAX_Intensity 1600
static volatile uint16_t Intensity = 10;
void Timer4_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_BaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_BaseStructure.TIM_Prescaler = 1 - 1;
TIM_BaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_BaseStructure.TIM_Period = MAX_Intensity - 1;
TIM_BaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM4, &TIM_BaseStructure);
TIM_Cmd(TIM4, ENABLE);
}
void PWM_Configuration()
{
TIM_OCInitTypeDef TIM_OCStructure;
TIM_OCStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCStructure.TIM_Pulse = 0;
TIM_OC1Init(TIM4, &TIM_OCStructure);
TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_OC2Init(TIM4, &TIM_OCStructure);
TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_OC3Init(TIM4, &TIM_OCStructure);
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
TIM_OC4Init(TIM4, &TIM_OCStructure);
TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);
}
void GPIO_PWM_Configuration()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource12, GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource13, GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_TIM4);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_TIM4);
GPIO_InitStructure.GPIO_Pin = ALL_LEDS;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
}
void TIM2_Configuration(u32 Intervalms)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Prescaler = 16000-1;
TIM_TimeBaseStructure.TIM_Period = Intervalms-1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM2, ENABLE);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void TIM2_IRQHandler()
{
if(TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
if(Intensity > MAX_Intensity)
{
Intensity = 10;
}
TIM4->CCR1 = Intensity;
TIM4->CCR2 = Intensity;
TIM4->CCR3 = Intensity;
TIM4->CCR4 = Intensity;
Intensity = Intensity * 2;
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
}
}
int main(void)
{
GPIO_PWM_Configuration();
Timer4_Configuration();
// Do not work
PWM_Configuration();
TIM2_Configuration(500);
// Do work
//TIM2_Configuration(500);
//PWM_Configuration();
while(1)
{
}
}
The code above is the example I am referring to. However, the Timer2 interrupt does not occur in this code. However, if you change the TIM2_Configuration function call to before the PWM_Configuration function call, the interrupt operates normally. I can't find the cause of this behavior, so I'm asking a question.
i'm conducting practice using STM32F407G-DISC1.
I called the printf function for debugging, but an interrupt occurred in any order.
Upvotes: 1
Views: 44