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Are there any options for delay in STM32F4?
For that purpose, lib has been changes. now you have 2 options for delay: With Systick timer, there is 1ms interrupt (not 1us anymore) for counting time and for 1us delay there is just simple variable based counter (not so accurate). If you need Systick timer for RTOS (or anything else) then you can enable any timer on your MCU for delay.
How to use delay function in microcontroller library?
Microcontroller has Systick timer, which can be configured as interrupt generator every X ticks of core clock. In my delay library I set timer to interrupt every 1us. This is every 180 clock ticks. When you use delay function, you set number of microseconds to delay. Systick timer decrease variable everytime interrupt is called.
What kind of CPU does stm32l151 / 152 use?
The STM32L151/152 devices extend the ultra-low-power concept with no compromise on performance, using the Cortex-M3 core and a flexible CPU clock from 32 kHz up to 32 MHz.
How to set STM32F4 system clock in Excel?
PS: On Clock speeds is a great tutorial how to do it with ST’s excel clock configuration tool, but this tool does not support frequencies larger than 168MHz, so we will do it manually. STEP 1: Open your project file stm32f4xx.h and find code below (it should start at line 91 ):
Are there LEDs on the PWM pins on STM32F4 Discovery?
Because STM32F429 Discovery board does not have leds on PWM pins, I will use STM32F4 Discovery with 168MHz core clock for this example. Leds are connected to pins PD12 to PD15, what give us timer TIM4 with Output channels 1 to 4. Here we will initialize timer, for our PWM frequency.
How to increase the frequency of the stm32f429 clock?
STM32F429 can go up to 180MHz. It has PLL ( P hase- L ocked L oop) inside to increase frequency from 8MHz external crystal which is on board. I will describe how you do this, step by step.