STM32 capture/compare channels-EEWORLD

Collect

Each capture/compare channel is built around a capture/compare register (including shadow registers), including the capture input section (digital filtering, multiplexing and prescaler), and the output section (comparator and output control).

Input: Digital filtering, multiplexing and prescaler

Output: Comparator and output control

In capture mode, the capture occurs on the shadow register, which is then copied to the preload register. In compare mode, the contents of the preload register are copied to the shadow register, which is then compared to the counter.

Configuration steps for output compare mode:

1. Select counter clock (internal, external, prescaler)

2. Write the corresponding data into the TIMx_ARR and TIMx_CCRx registers

3. If you want to generate an interrupt request and/or a DMA request, set the CCxIE bit and/or CCxDE bit.

4. Select the output mode, for example, toggle the OCx output pin when the counter CNT matches CCRx, preload CCRx and unused, turn on the OCx output and high level is valid, then you must set OCxM='011', OCxPE='0', CCxP='0' and CCxE='1'.

5. Set the CEN bit of the TIMx_CR1 register to start the counter

Keywords：STM32 Reference address：STM32 capture/compare channels

Previous article：Knowledge and configuration of STM32 general timer
Next article：Error[Pe020]: identifier appears when debugging STM32 with IAR

Recommended ReadingLatest update time:2024-11-16 12:55

STM32 clock frequency and timer clock explanation

******************************** This study note is based on the STM32 firmware library V3.0. Chip model used: STM32F103 Development environment: MDK ********************************* Lesson 1 Clock Frequency The internal 8M oscillator of STM32F103 can reach a maximum of 72M after frequency multiplication.

[Microcontroller]

STM32 clock frequency and timer clock explanation

FreeRTOS interrupt settings based on STM32 applications

1. Introduction to FreeRTOS interrupt settings Two macros are defined in FreeRTOSConfig.h: configKERNEL_INTERRUPT_PRIORITY configMAX_SYSCALL_INTERRUPT_PRIORITY configKERNEL_INTERRUPT_PRIORITY is used to set the interrupt priority of the RTOS kernel. Because the RTOS kernel interrupt is not allowed to p

[Microcontroller]

FreeRTOS interrupt settings based on STM32 applications

STM32 system timer SysTick

1. SysTick system timer overview After learning about STM32 interrupts, we need to learn about STM32 timers. Just like the most basic function of a phone is to talk to people, the most basic function of a timer is timing (some STM32 timers are more powerful than you can imagine, of course, not SysTick that we are go

[Microcontroller]

Analysis of GPIO_Init() function in STM32

When learning STM32, you must first be familiar with the running light routine. Here we will analyze the GPIO_Init() function in the running light. For example: the port used in the running light example is macLED1_GPIO_PORT=GPIOB, The controlled pin is GPIO_Pin_0, The pin mode is GPIO_Mode_Out_PP (general p

[Microcontroller]

Analysis of GPIO_Init() function in STM32

SPI clock of STM32

1) fPCLK is not the CPU frequency, but the frequency of the peripheral bus. 2) The fastest SPI clock of STM32 is 18MHz, which is determined when the chip is designed. 3) STM32's SPI1 is on APB2, SPI2 and SPI3 are on APB1, the highest frequency of APB1 is 36MHz, and the highest frequency of APB2 is 72MHz; therefor

[Microcontroller]

stm32 register address name mapping

Base address + offset address

[Microcontroller]

The STM32 serial port DMA sends two frames continuously, resulting in partial data overwriting

Problem Description When using the STM32 serial port for DMA transmission (Noraml mode), the transmission function log_printf() is called twice in a task, but the data sent back is not consistent with the expected display on the serial port debugging assistant. Part of the data sent for the first time is overwritten

[Microcontroller]

How to set the timer in STM32

How to set the timer in STM32 The following uses stm32's TIM2 as an example to configure it step by step as a timer: The first Basic configuration of the timer TIM_TimeBaseStructure.TIM_Period = 1000; //Set the automatic load register TIM_TimeBaseStructure.TIM_Prescaler = 35999; //Frequency division count

[Microcontroller]

Popular Resources
Popular amplifiers