How can I start and stop a timer on STM32?
The timers can be enabled/disabled by toggling the CEN bit of the timers control register 1 (TIMx_CR1). CEN is usually the 0th bit. TIM_Cmd (ENABLE) function call will enable the timer. TIM_Cmd (DISABLE) function call will disable the timer. By calling NVIC_DisableIRQ (TIM7_IRQn), you are just disabling the interrupt for Timer7 not the Timer.
Why does Tim _ timebaseinit ( ) trigger the interrupt?
Issuing the TIM_TimeBaseInit () function caused the TIM_SR_UIF flag to become set. I haven’t gone back yet to figure out why. Once this bit is set, the interrupt will trigger as soon as it is enabled. To fix it, after calling TIM_TimeBaseInit (), I immediately called TIM_ClearITPendingBit ().
Why do peripherals keep triggering the timer interrupt?
If debugging, remember that by default the peripherals won’t stop on core halt, so the timers will keep triggering the interrupt while you’re halted. I also had a nice headache back time ago, until I discovered the bits for freezing peripherals in debug mode.
How to enable an interrupt in a microcontroller?
Once this bit is set, the interrupt will trigger as soon as it is enabled. To fix it, after calling TIM_TimeBaseInit (), I immediately called TIM_ClearITPendingBit (). Then I would enable the interrupt with TIM_ITConfig (). This fixed the problem.
How does synchronization circuit in STM32 work?
Synchronization circuit to control the timer with external signals and to interconnect several timers together. Repetition counter to update the timer registers only after a given number of cycles of the counter. Break input to put the timer’s output signals in a reset state or in a known state.
How does the ADC work on the STM32?
The ADCs can be triggered with most of the STM32 timers, with three options. This can be done using compare events: the ADC conversion will start on a given compare match. The list of supported compare events varies from one timer to the other, as shown on the table. The TRGO event can also be used on certain timers.
Where does the default clock come from on the STM32?
The default clock comes from the reset and clock controller, linked to one of APB clock domains. The various timers are shared on the 2 APB domains to implement low-power schemes (typically one high-speed APB and one low-speed APB to limit the current drawn by the peripherals, including the timers).
How to set up timers at the same time?
To be noted that in the same program I have Timer1 set up as Capture Compare No Output, and Timer2 to generate a 1.4 MHz clock in the same manner as Timer3 and Timer4. Later Edit. The called function in the HAL driver: The best way of doing this will be by using timer synchronization.
How to start TIM3 and tim4 at the same time?
Set TIM3 to “Enable” master mode ( MMS field of TIM3_CR2 ), and set TIM4 to “Trigger mode” slave mode with trigger ITR2 ( TS and SMS fields of TIM4_SMCR ). If you’ve configured everything properly, starting TIM3 will also simultaneously start TIM4.