From 876cfe03f64c144b6353e22240beac09685edb9a Mon Sep 17 00:00:00 2001 From: James Zow Date: Sun, 10 Sep 2023 16:48:25 +0800 Subject: [PATCH] Update one-shot-timer.md --- .../09-clocks-and-timers/one-shot-timer.md | 60 ++++++++----------- 1 file changed, 26 insertions(+), 34 deletions(-) diff --git a/f3discovery/src/09-clocks-and-timers/one-shot-timer.md b/f3discovery/src/09-clocks-and-timers/one-shot-timer.md index 9ffbdd361..c47ae4dbf 100644 --- a/f3discovery/src/09-clocks-and-timers/one-shot-timer.md +++ b/f3discovery/src/09-clocks-and-timers/one-shot-timer.md @@ -1,48 +1,40 @@ -# One-shot timer +# 一次性定时器 -I hope that, by now, I have convinced you that `for` loop delays are a poor way to implement delays. +我希望，到目前为止，我已经说服您，`for`循环延迟是实现延迟的一种糟糕方式。 -Now, we'll implement delays using a *hardware timer*. The basic function of a (hardware) timer is -... to keep precise track of time. A timer is yet another peripheral that's available to the -microcontroller; thus it can be controlled using registers. +现在，我们将使用*硬件计时器*实现延迟。（硬件）计时器的基本功能是...精确跟踪时间。 +定时器是微控制器可用的另一个外围设备；因此可以使用寄存器来控制。 -The microcontroller we are using has several (in fact, more than 10) timers of different kinds -(basic, general purpose, and advanced timers) available to it. Some timers have more *resolution* -(number of bits) than others and some can be used for more than just keeping track of time. +我们使用的微控制器有几个（事实上超过10个）不同类型的定时器（基本定时器、通用定时器和高级定时器）。 +有些计时器比其他计时器具有更高的*分辨率*（位数），有些计时器可用于跟踪时间。 -We'll be using one of the *basic* timers: `TIM6`. This is one of the simplest timers available in -our microcontroller. The documentation for basic timers is in the following section: +我们将使用一个*基本*计时器：`TIM6`。这是我们微控制器中最简单的计时器之一。基本计时器的文档如下： -> Section 22 Timers - Page 670 - Reference Manual +> 第22节计时器-第670页-参考手册 -Its registers are documented in: +其寄存器记录在： -> Section 22.4.9 TIM6/TIM7 register map - Page 682 - Reference Manual +> 第22.4.9节TIM6/TIM7寄存器图-第682页-参考手册 -The registers we'll be using in this section are: +我们将在本节中使用的寄存器是： -- `SR`, the status register. -- `EGR`, the event generation register. -- `CNT`, the counter register. -- `PSC`, the prescaler register. -- `ARR`, the autoreload register. +- `SR`, 状态寄存器。 +- `EGR`, 事件生成寄存器。 +- `CNT`, 计数器寄存器。 +- `PSC`, 预分频器寄存器。 +- `ARR`, 自动卸载寄存器。 -We'll be using the timer as a *one-shot* timer. It will sort of work like an alarm clock. We'll set -the timer to go off after some amount of time and then we'll wait until the timer goes off. The -documentation refers to this mode of operation as *one pulse mode*. +我们将使用计时器作为*一次性*计时器。它会像闹钟一样工作。我们会将计时器设置为在一段时间后关闭， +然后等待计时器关闭。文档将此操作模式称为*单脉冲模式*。 -Here's a description of how a basic timer works when configured in one pulse mode: +以下描述了在单脉冲模式下配置基本计时器时的工作方式： -- The counter is enabled by the user (`CR1.CEN = 1`). -- The `CNT` register resets its value to zero and, on each tick, its value gets incremented by one. -- Once the `CNT` register has reached the value of the `ARR` register, the counter will be disabled - by hardware (`CR1.CEN = 0`) and an *update event* will be raised (`SR.UIF = 1`). +- 计数器由用户启用 (`CR1.CEN = 1`)。 +- `CNT`寄存器将其值重置为零，并且在每个刻度上，其值递增1。 +- 一旦`CNT`寄存器达到`ARR`寄存器的值，硬件将禁用计数器(CR1.CEN = 0)，并引发*更新事件* (`SR.UIF = 1`)。 -`TIM6` is driven by the APB1 clock, whose frequency doesn't have to necessarily match the processor -frequency. That is, the APB1 clock could be running faster or slower. The default, however, is that -both APB1 and the processor are clocked at 8 MHz. +`TIM6`由APB1时钟驱动，其频率不必与处理器频率匹配。也就是说，APB1时钟可能运行得更快或更慢。 +然而，默认情况下，APB1和处理器的时钟均为8 MHz。 -The tick mentioned in the functional description of the one pulse mode is *not* the same as one -tick of the APB1 clock. The `CNT` register increases at a frequency of `apb1 / (psc + 1)` -times per second, where `apb1` is the frequency of the APB1 clock and `psc` is the value of the -prescaler register, `PSC`. +单脉冲模式的功能描述中提到的刻度与APB1时钟的刻度*不*同。`CNT`寄存器以每秒`apb1 / (psc + 1)` 次的频率增加，其中 +`apb1`是APB1时钟的频率，`psc`是预分频器寄存器`PSC`的值。