Use of stm32 basic timer TIM6 and TIM7

The basic timer only has the most basic timing function, that is, when the accumulated number of clock pulses exceeds the preset value, it can trigger an interrupt or trigger a DMA request.

The following settings are required to use the timing function of the basic timer:

1) Enable the timer clock.

2) Set the pre-scaling number.

3) Set the counter value.

4) Set the sampling frequency division number.

5) Set the counting mode, up or down. TIM6 and TIM7 only have up counting function.

6) Enable interrupts, configure interrupt groups and interrupt service functions.

The configuration function is as follows:

/**************************************************************
** Function name: TIM6_Config
** Function description: Basic timer configuration
** Input parameters: None
** Output parameters: None
** Note: Timing time = (prescaler number + 1) * (count value + 1) / TIM6 clock (72MHz), unit (s)
   Here the overflow time t = (7200*10000) / 72000000s = 1s
*******************************************************************/
void TIM6_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE); // Enable TIM6 clock


/* Basic settings */
TIM_TimeBaseStructure.TIM_Period = 10000-1; // Count value 10000   
TIM_TimeBaseStructure.TIM_Prescaler = 7200-1; //Pre-division, this value + 1 is the divisor of the division
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //Sampling division
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //Count up
TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);


TIM_ITConfig(TIM6,TIM_IT_Update, ENABLE); //Enable TIM6 interrupt
TIM_Cmd(TIM6, ENABLE); //Enable timer 6
}
/******************************************************************
** Function name: NVIC_Config
** Function description: Interrupt priority configuration
** Input parameters: None
** Output parameters: None
*****************************************************************/
void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //Use group 2 
 
NVIC_InitStructure.NVIC_IRQChannel =TIM6_IRQn;//TIM6 interrupt
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//Preemptive priority is set to 0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //Sub-priority is set to 0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//Interrupt enable
NVIC_Init(&NVIC_InitStructure);//Interrupt initialization
}

The interrupt service function is as follows:

/**********************************************************
** Function name: TIM6_IRQHandler
** Function description: Timer 6 update interrupt service routine
** Input parameters: None
** Output parameters: None
**************************************************************/
void TIM6_IRQHandler(void)
{
if (TIM_GetITStatus(TIM6, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM6,TIM_IT_Update);//Clear update interrupt flag
GPIOB->ODR^=GPIO_Pin_0;//Reverse PB0 level
}
}

The usage of TIM7 is similar. The timing interrupt function of the general timer is also used in this way. Just modify TIM6.