STM32f100: how start TIM1 interrupt handler

[n239955_stm1_stmicro_com]

Posted on June 23, 2011 at 18:03

Hi!

I've to program STM32f100R4H6; particularly i've to manage TIM1 interrupt. Below there is my code..Thank you in advance.. -------------------------------------------------------------------------------------------- //In the first part of the main.. void RCC_init(void){ // 1. Clocking the controller from internal HSI RC (8 MHz)   RCC_HSICmd(ENABLE);   // wait until the HSI is ready   while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);   RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);   // 2. Enable ext. high frequency OSC   RCC_HSEConfig(RCC_HSE_ON);   // wait until the HSE is ready   // 3. Init PLL   RCC_PLLCmd(ENABLE);   // wait until the PLL is ready   while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);   // 4. Set system clock dividers   RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);   RCC_ADCCLKConfig(RCC_PCLK2_Div8);   RCC_PCLK2Config(RCC_HCLK_Div1);   RCC_PCLK1Config(RCC_HCLK_Div2);   RCC_HCLKConfig(RCC_SYSCLK_Div1);   /*&sharpdefine EMB_FLASH &sharpifdef EMB_FLASH   // 5. Init Embedded Flash   // Zero wait state, if 0 < HCLK 24 MHz   // One wait state, if 24 MHz < HCLK 56 MHz   // Two wait states, if 56 MHz < HCLK 72 MHz   // Flash wait state   FLASH_SetLatency(FLASH_Latency_2);   // Half cycle access   FLASH_HalfCycleAccessCmd(FLASH_HalfCycleAccess_Disable);   // Prefetch buffer   FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); &sharpendif // EMB_FLASH */     // 5. Clock system from PLL   RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); --------------------------------------------------------------------------------------------- //Function that manage TIM1 void tim1_init(void){ /*-------TIMER START----------*/  TIM_TimeBaseInitTypeDef TIM1_TimeBaseInitStruct;   // Timer1 Init   // Enable Timer1 clock and release reset   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);   RCC_APB2PeriphResetCmd(RCC_APB2Periph_TIM1,DISABLE);   /*-----------------SETTAGGIO PARAMETRI TIMER1----------------*/   //  Prescaler=7200  &   Period=10000 & Repetition =0-->Trigger event ogni secondo   //  Prescaler=3600  &   Period=10000 & Repetition =0-->Trigger event ogni 0.5 secondi   //  Prescaler=720   &   Period=10000 & Repetition =0-->Trigger event ogni 100ms   //  Prescaler=6534  &   Period=10   & Repetition =0-->Trigger event ogni 1ms   /*-----------------------------------------------------------*/   TIM1_TimeBaseInitStruct.TIM_Prescaler = 1;    TIM1_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;   TIM1_TimeBaseInitStruct.TIM_Period = 1;    TIM1_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;   TIM1_TimeBaseInitStruct.TIM_RepetitionCounter = 0;   TIM_TimeBaseInit(TIM1,&TIM1_TimeBaseInitStruct);   // Clear update interrupt bit   TIM_ClearITPendingBit(TIM1,TIM_IT_Update);   // Enable update interrupt   TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);   NVIC_InitTypeDef NVIC_InitStructure; //create NVIC structure   NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_TIM16_IRQn;   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   NVIC_Init(&NVIC_InitStructure);   // Enable timer counting   TIM_Cmd(TIM1,ENABLE); /*---------END TIMER----------*/  } void TIM1_UP_TIM16_IRQHandler(void){ ... } #problem #tim1 #stm32 #timer #interrupt

[Tesla DeLorean]

Posted on November 05, 2015 at 21:18

Update is the reset/zero event, ie rolls to zero, you yes you'll get that initial interrupt. You'll have to manage that if it's critical to your process. ie use a flag, and ignore the first entry.