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…

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…

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…

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…

#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…

BACKGROUND OF THE INVENTION FIG. 1A is a simplified block diagram schematically representing a typical prior art network router 10. Packet forwarding router 10 includes two major subsystems: control plane 12 and data plane 11. Data plane 11 provides…

专题文档汇总目录 Notes:BroadcastTick作为cpuidle的waker,硬件基础.BroadcastTick嵌入在当前系统Tick框架中.BroadcastTick设备初始化:周期性Tick和OneShot两种模式下BroadcastTick的工作. 原文地址:Linux时间子系统之(十四):tick broadcast framework 一.前言 在内核中,有cpuidle framework可以控制cpu的节电:当没有进程调度到该cpu上执行的时候,swapper进程粉墨登…

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011794 In many applications, a DC/DC Converter is used to produce a regulated voltage or current, derived from an unregulated power supply, or from a battery. Ex…

一.前言 在内核中,有cpuidle framework可以控制cpu的节电:当没有进程调度到该cpu上执行的时候,swapper进程粉墨登场,将该cpu会被推入到idle状态.当然CPU的idle状态有深有浅,当CPU睡的比较深入的时候,有可能会关闭本地的timer硬件.这样就会引入一个很有意思的问题:local timer将无法唤醒CPU,该cpu上的所有的software timer将无法唤醒cpu.tick broadcast framework就是用来解决这个问题的. 本文中的代码来自…

An application binary interface includes linkage structures for interfacing a binary application program to a digital computer. A function in a relocatable shared object module obtains the absolute address of a Global Offset Table (GOT) in the module…

BACKGROUND OF THE INVENTION The present invention relates to data transfer across domains, and more particularly, to data transfer across a number of different protection domains using page remapping. Operating systems that utilize different protecti…

A system and method in one embodiment includes modules for detecting an access attempt to a critical address space (CAS) of a guest operating system (OS) that has implemented address space layout randomization in a hypervisor environment, identifying…

A system and method for address space layout randomization ("ASLR") for a Windows operating system is disclosed. The address space layout includes one or more memory regions that are identified and then a particular implementation of the system…

In a computing system, cache coherency is performed by selecting one of a plurality of coherency protocols for a first memory transaction. Each of the plurality of coherency protocols has a unique set of cache states that may be applied to cached dat…

To ensure that a memory device operates in self-refresh mode, the memory controller includes (1) a normal-mode output buffer for driving a clock enable signal CKE onto the memory device's CKE input and (2) a power island for driving a clock enable si…

A method for operating a memory module device. The method can include transferring a chip select, command, and address information from a host memory controller. The host memory controller can be coupled to a memory interface device, which can be cou…

专题文档汇总目录 Notes:ARM平台Clock/Timer架构:System counter.Timer以及两者之间关系:Per cpu timer通过CP15访问,System counter通过memory mapped IO访问:将System counter和Per cpu timer分别作为clocksource和clock event device注册到Linux时间子系统. 原文地址:Linux时间子系统之(十七):ARM generic timer驱动代码分析 一.前言 关注…

Timers get their clock source from External pins or Internal timer sources. External External = pins: TI1 or TI2 or ETR set pin to be used: in TIMx_CCMR1 reg - set pin to be used by writing CCxS bits select polarity of input in TIMx_CCER reg - write…

一.前言 关注ARM平台上timer driver(clocksource chip driver和clockevent chip driver)的驱动工程师应该会注意到timer硬件的演化过程.在单核时代,各个SOC vendor厂商购买ARM core的IP,然后自己设计SOC上的peripherals,这里面就包括了timer的硬件.由于没有统一的标准,各个厂商的设计各不相同,这给驱动工程师带来了工作量.然而,如果仅仅是工作量的话就还好,实际上,不仅仅如此.linux的时间子系统要求硬件t…

In one embodiment, a method includes transitioning control to a virtual machine (VM) from a virtual machine monitor (VMM), determining that a VMM timer indicator is set to an enabling value, and identifying a VMM timer value configured by the VMM. Th…

大多数开发者可能都会这样来实现定时器.创建定时器的时候,由于目标对象是self,所以要保留此实例.然而,因为定时器是用实例变量存放的,所以实例也保留了定时器,这就造成了循环引用.除非调用stop方法,或者系统回收实例,才能打破循环引用,如果无法确保stop一定被调用,就极易造成内存泄露.当指向XXClass实例的最后一个外部引用移走之后,该实例仍然会继续存活,因为定时器还保留着它.而定时器对象也不可能被系统释放,因为实例中还有一个强引用正在指向它.这种内存泄露是很严重的,如果定时器每次轮训都执行…

参考文档 https://www.cnblogs.com/chengqi521/p/7977616.html 前言 对于ZYNQ的开发,顶层一般为PS+PL,而PL一般会封装成顶层,只露出接口. 而PL的子模块一般会用到Vivado提供的IP,如果是把所有PL端的模块直接导入工程,再想拖到block diagram中,就会报错. 错误类似下述: update_module_reference aeye_vivado_top_st_top_0_0 ERROR: [filemgmt 56-181]…

蓝牙BLE实用教程 Bluetooth BLE 欢迎使用 小书匠(xiaoshujiang)编辑器,您可以通过 设置 里的修改模板来改变新建文章的内容. 1.蓝牙BLE常见问答 Q: Smart Ready 和 Smart 以及传统蓝牙之间是什么关系? Q: 双模(dual-mode)和单模(single-mode)有什么区别? Q: There is a confusion between Server-Client vs Master-Slave vs Central-Peripheral.…

形象解释PID算法 小明接到这样一个任务: 有一个水缸点漏水(而且漏水的速度还不一定固定不变),要求水面高度维持在某个位置,一旦发现水面高度低于要求位置,就要往水缸里加水. 小明接到任务后就一直守在水缸旁边,时间长就觉得无聊,就跑到房里看小说了,每30分钟来检查一次水面高度.水漏得太快,每次小明来检查时,水都快漏完了,离要求的高度相差很远,小明改为每3分钟来检查一次,结果每次来水都没怎么漏,不需要加水,来得太频繁做的是无用功.几次试验后,确定每10分钟来检查一次.这个检查时间就称为采样周期. 开…

欢迎使用 小书匠(xiaoshujiang)编辑器,您可以通过 设置 里的修改模板来改变新建文章的内容. 1.蓝牙BLE常见问答 Q: Smart Ready 和 Smart 以及传统蓝牙之间是什么关系? Q: 双模(dual-mode)和单模(single-mode)有什么区别? Q: There is a confusion between Server-Client vs Master-Slave vs Central-Peripheral. I need a simplified exp…

BACKGROUND Many processors include a time stamp count (TSC) counter which is typically implemented as a counter that increments at a fixed rate. Some known TSC counters are clocked at a bus clock rate and a multiplier value is added each bus clock cy…

BACKGROUND The present disclosure relates generally to information processing systems and, more specifically, to a mechanism that maintains the architectural state values for both active and inactive software threads that may be executed on a process…

In one embodiment, a network management system (NMS) determines an intent to initialize a request-response exchange with a plurality of clients in a low power and lossy network (LLN). In response, the NMS adaptively schedules corresponding responses…

A novel massively parallel supercomputer of hundreds of teraOPS-scale includes node architectures based upon System-On-a-Chip technology, i.e., each processing node comprises a single Application Specific Integrated Circuit (ASIC). Within each ASIC n…

In one embodiment, a first stationary router may detect a disconnected backhaul link to a destination. In response to detecting the disconnected backhaul link, the first stationary router may send a message to a first traveling mobile device, to caus…