smt32f429 timer free running

To set up a free-running timer on the STM32F429 microcontroller, you can follow these steps:

  1. Enable the clock for the timer you want to use. For example, if you want to use Timer 2, you need to enable the clock for Timer 2 by setting the appropriate bit in the RCC_APB1ENR register.

  2. Configure the timer's prescaler and period values. The prescaler determines the frequency at which the timer will run, and the period determines the timer's overflow value. You can set these values by writing to the appropriate registers (TIMx_PSC and TIMx_ARR) of the timer you are using.

  3. Enable the timer's update event interrupt, if needed. This will allow you to handle the timer's overflow event in your code. You can do this by setting the appropriate bit in the TIMx_DIER register.

  4. Start the timer by setting the appropriate bit in the TIMx_CR1 register. This will start the timer counting.

Here is an example code snippet in assembly language for setting up a free-running timer on the STM32F429 microcontroller:

; Enable the clock for Timer 2
LDR R0, =RCC_BASE
LDR R1, [R0]
ORR R1, R1, #0x00000001 ; Set bit 0 to enable Timer 2 clock
STR R1, [R0]

; Configure the prescaler and period values for Timer 2
LDR R0, =TIM2_BASE
LDR R1, [R0, #0x28] ; Load TIMx_PSC register address
MOV R2, #1000 ; Set prescaler value
STR R2, [R1]
LDR R1, [R0, #0x2C] ; Load TIMx_ARR register address
MOV R2, #65535 ; Set period value
STR R2, [R1]

; Enable the update event interrupt for Timer 2
LDR R1, [R0, #0x0C] ; Load TIMx_DIER register address
ORR R2, R2, #0x00000001 ; Set bit 0 to enable update event interrupt
STR R2, [R1]

; Start Timer 2
LDR R1, [R0, #0x00] ; Load TIMx_CR1 register address
ORR R2, R2, #0x00000001 ; Set bit 0 to start the timer
STR R2, [R1]

Please note that this is just an example and you may need to modify it based on your specific requirements and the timer you are using.