Timer (計時器) 就是慢慢數時間,在timer內部有一個計數器. 而計數器會數到Register的value當數值數到設定值Timer就會發起IRQ 而程式就會轉跳到中斷向量裡頭去執行想要做的事情. Timer 計時器配置 TIM_TimeBaseInitTypeDef TIM3_TimeBase; TIM3_TimeBase.TIM_ClockDivision = ; TIM3_TimeBase.TIM_CounterMode = TIM_CounterMode_Up; TIM3_Tim…

Timers TIM1 and TIM8 use 16-bit counters and are the most complex timers of all timers included in the microcontroller. Timers TIM2 and TIM5 are 32-bit versions of TIM1/TIM8, but have less hardware included and therefore less options. Timers TIM3 and…

The Timers can be cascaded to make more complex timing relationships, or longer periods. Internally only some timers can trigger others. This is a Master/Slave relationship and is handled by the SMS register. For example, you can see below that TIM8…

Timer 比較模式(compare) 具體會用在哪種狀況目前還沒有這種經驗,但Compare有配置功能pin想必有應用會用到這個模式 從Function Block來看比較模式比基本Timer多了比較這一個流程去控制Output狀態 Timer 具體配置如下 : TIM_TimeBaseInitTypeDef TIM3_TimeBase; TIM_OCInitTypeDef TIM3_OC; TIM3_TimeBase.TIM_ClockDivision = ; TIM3_TimeBase.T…

#define CLK_FREQ ( 10000 ) #define CORE_FREQ ( 168000000 ) static void TIM_GPIO_Config( void ) { GPIO_InitTypeDef GPIO_InitStructure; // Enable GPIOA clock __HAL_RCC_GPIOA_CLK_ENABLE( ); // Configure PA8 pin as CLK output -- to CK Input GPIO_InitStru…

從一個厲害的國外工程師看來的delay寫法,使用while loop會使用幾個指令去計算,可能會需要多少時間. while(variable--); 這行代碼執行一次預估會消耗MCU 4 clock cycles 的時間.可以透過Disassembly觀察出來. 但是在計算delay之前我們還必須知道,MCU執行一條指令需要花費多少時間. 所以我們透過GetClocksFreq去知道System clock大概需要花多少時間. 但是我們用的STM32F407,System clock = 168…

前面的话 本文将详细介绍SVG基本操作API,并使用这些API操作实例效果 基础API 在javascript中,可以使用一些基本的API来对SVG进行操作 [NS地址] 因为SVG定义在其自身的命令空间下,而不是HTML的命名空间下,可以作为单独的XML文件存在.所以需要使用自身的NS地址 有两个常用的NS地址 var SVG_NS = "http://www.w3.org/2000/svg"; var XLINK_NS = "http://www.w3.org/1999/…

一.前言 严格来讲Alarm Timer也算POSIX Timer一部分,包含两种类型CLOCK_REALTIME_ALARM和CLOCK_BOOTTIME_ALARM.分别是在CLOCK_REALTIME和CLOCK_BOOTTIME后面加上_ALARM.Alarm Timer之外的POSIX Timer在内核进入cpuidle或者suspend之后,都会因为省电关闭ClockEvent设备而停止计时.而Alarm Timer恰恰借助RTC设备的长供电且具备唤醒功能,在系统进入suspend过…

STM32F4 SPI with DMA A few people have requested code, so I thought I’d post the code showing how I’ve configured my GPIO, timer, SPI, DMA and NVIC modules, along with some explanation of how the system works.Note that I’m using the STM32F4 Standard…

78-WS2812-Library (STM32F4) //-------------------------------------------------------------- // File : stm32_ub_ws2812.h //-------------------------------------------------------------- //--------------------------------------------------------------…