Interrupt Doesn't occur

[anuj]

Posted on September 01, 2016 at 21:47

I am working on STM32F030 Discovery. I trying to generate 1ms interrupt. But the code doesn't work. But when change the htim3.Init.Period from 0 to 1, it works with 2ms interrupt. But I need 1ms interrupt. Frequency is set at 48MHz.

Here is my TIM3_Initvoid TIM3_Init(void){  TIM_ClockConfigTypeDef sClockSourceConfig;  TIM_MasterConfigTypeDef sMasterConfig;  htim3.Instance = TIM3;  htim3.Init.Prescaler = 48000;  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;  htim3.Init.Period = 0;  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;  HAL_TIM_Base_Init(&htim3);  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;  HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig);  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;  HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig);} #!stm32-!cubemx #interrupts

[Tesla DeLorean]

Posted on September 01, 2016 at 22:43

Put the smaller number in the Prescaler, review the diagrams in the Reference Manual to understand how the counting portion functions.

  htim3.Init.Prescaler = 0; // DIV1

  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;

  htim3.Init.Period = 48000-1; // DIV48000, ie 0-47999, where final count before rollover is 47999