b wake_up 什么意思
时间: 2024-03-10 10:47:42 浏览: 34
`wake_up` 是 Linux 内核中用于唤醒等待队列中进程的函数。等待队列是一种用于进程同步的机制,当多个进程需要共享某些资源时,它们可以加入到同一个等待队列中等待资源的释放。当资源可用时,等待队列中的进程会被唤醒并竞争资源的使用权。
`wake_up` 函数的函数原型如下:
```c
void wake_up(wait_queue_head_t *q);
```
其中,`q` 参数是指向等待队列头结构体的指针。`wake_up` 函数会遍历等待队列中的所有进程,并将它们从等待队列中移除,然后将它们添加到调度器的运行队列中,使它们可以被调度器调度执行。
需要注意的是,`wake_up` 函数只会唤醒等待队列中的所有进程,而不会进行资源的分配或者保护,因此需要在使用 `wake_up` 函数时确保资源被正确地分配和保护。另外,Linux 内核中还提供了其他类型的等待队列,如读写等待队列、定时器等待队列等,每种类型的等待队列都有对应的唤醒函数。
相关问题
翻译Enable/Disable WAKE_B to wake-up the device on falling edge when VDDQ is not present. • 0 - WAKE_B is pulled up to VDDQ (internally and/or externally). WAKE_B is ignored while in LPM if VDDQ is low. • 1 - WAKE_B is externally pulled up to VBATP or VDDQ and wakes upon a falling edge of the WAKE_B pin regardless of the VDDQ status.(VDDQ is not expected to go low)
启用/禁用 WAKE_B 来在 VDDQ 不存在时由下降沿唤醒设备。
• 0 - WAKE_B 被拉高到 VDDQ(内部和/或外部)。在低功耗模式时,如果 VDDQ 低电平,将忽略 WAKE_B 信号。
• 1 - WAKE_B 外部被拉高到 VBATP 或 VDDQ,并且在 WAKE_B 引脚上出现下降沿时唤醒,无论 VDDQ 的状态如何。(不预期 VDDQ 会出现低电平)
翻译Device configuration register The device has various configuration settings that are global in nature. The configuration settings are as follows: • When the 33978 is in the overvoltage region, a Logic [0] on the VBATP OV bit limits the wetting current on all input channels to 2 mA and the 33978 will not be able to enter into the Low-power mode. A Logic [1] allows the device to operate normally even in the overvoltage region. The OV flag will be set when the device enters in the OV region, regardless the value of the VBATP OV bit. • WAKE_B can be used to enable an external power supply regulator to supply the VDDQ voltage rail. When the WAKE_B VDDQ check bit is a Logic [0], the WAKE_B pin is expected to be pulled-up internally or externally to VDDQ and VDDQ is expected to go low, therefore the 33978 does not wake-up on the falling edge of WAKE_B. A Logic [1], assumes the user is using an external pull-up to VBATP or VDDQ (when VDDQ is not expected to be off) and the IC wakes up on a falling edge of WAKE_B. • INT_B out is used to select how the INT_B pin operates when an interrupt occurs. The IC is able to pulse low [1] or latch low [0]. • Aconfig[1-0] is used to determine the method of selecting the AMUX output, either a SPI command or using a hardwired setup using SG[3-1]. • Inputs SP0-7 may be programmable for switch-to-battery or switch-to-ground. These inputs types are defined using the settings command. To set a SPn input for switch-to-battery, a logic [1] for the appropriate bit must be set. To set a SPn input for switch-toground, a logic [0] for the appropriate bit must be set. The MCU may change or update the programmable switch register via software at any time in Normal mode. Regardless of the setting, when the SPn input switch is closed a logic [1] is placed in the serial output response register.
设备配置寄存器
该设备具有多种全局性质的配置设置。配置设置如下:
• 当33978处于过压区域时,VBATP OV位为逻辑[0]将所有输入通道的润湿电流限制为2 mA,并且33978无法进入低功耗模式。逻辑[1]允许设备即使在过压区域正常运行。当设备进入过压区域时,OV标志将被设置,而不管VBATP OV位的值如何。
• WAKE_B可用于启用外部电源调节器来供应VDDQ电压轨。当WAKE_B VDDQ检查位为逻辑[0]时,预期WAKE_B引脚会被内部或外部拉高到VDDQ,并且预期VDDQ会变低,因此33978不会在WAKE_B下降沿唤醒。逻辑[1]假设用户正在使用外部上拉到VBATP或VDDQ(当不希望VDDQ关闭时),并且IC在WAKE_B下降沿唤醒。
• INT_B out用于在发生中断时选择INT_B引脚的操作方式。IC能够脉冲低电平[1]或锁定低电平[0]。
• Aconfig [1-0]用于确定选择AMUX输出的方法,可以是SPI命令或使用硬连线设置使用SG [3-1]。
• 输入SP0-7可以编程为切换至电池或切换至地。这些输入类型使用设置命令进行定义。要将SPn输入设置为切换至电池,必须设置相应位的逻辑[1]。要将SPn输入设置为切换至地,必须设置相应位的逻辑[0]。MCU可以在正常模式下随时通过软件更改或更新可编程开关寄存器。无论设置如何,当SPn输入开关闭合时,逻辑[1]将放置在串行输出响应寄存器中。