[问答]

nrf51822低功耗睡眠模式的软件应用？

1677

问答对人有帮助，内容完整，我也想知道答案 0 nrf51822芯片datasheet原文，说是系统可以设置在System OFF MODE，此模式下CPU停止，外设运行，RAM数据保存，是最省电的睡眠，系统可以被GPIO的detect信号唤醒而后重启，原文如下: System OFF is the deepest power saving mode the system can enter. In this mode, the system’s core functionality is powered down and all ongoing tasks are terminated. The only mechanism that is functional and responsive in this mode is the reset mechanism. One or more blocks of the RAM can be retained in System OFF mode depending on the settings in the RAMON register. The system can be woken up from system OFF mode either from the DETECT signal generated by the GPIO peripheral, or from a reset. When the system wakes up from OFF mode, a system reset is performed. 库函sd_power_system_off()的函数说明是：Puts the chip in System OFF mode. 我用这个函数点灯基本确定CPU是睡下去了，但是GPIO中断没有唤醒起来。芯片GPIO关于DETECT信号有这样的说明，如下： ORT is an event that can be generated from multiple input pins using the GPIO DETECT signal. The event will be generated on the rising edge of the DETECT signal. See section 13.1 on page 55 for more information about the DETECT signal. This feature is always enabled although the peripheral itself appears to be IDLE, that is, no clocks or other power intensive infrastructure have to be requested to keep this feature enabled. This feature can therefore be used to wake-up the CPU from a WFI or WFE type sleep in System ON with all peripherals and the CPU idle, that is, lowest power consumption in System ON mode. 我个人觉得，detect信号就是一个高低电平，GPIO原文也说这个DETECT信号可以将CPU从睡眠模式唤醒，但是实际却还是没有唤醒。希望有搞这一块的朋友帮一起看看，或者加QQ312382027讨论一下。谢谢哈 0
2020-7-20 08:02:46　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × cmh22 该类别下有 10 个回答。邀请回答 Dockert 该类别下有 10 个回答。邀请回答 tutu10 该类别下有 9 个回答。邀请回答 milly888 该类别下有 9 个回答。邀请回答 testd012 该类别下有 9 个回答。邀请回答 wupei1024 该类别下有 9 个回答。邀请回答报纸弟弟麦花该类别下有 9 个回答。邀请回答 nvhwyrwerw 该类别下有 9 个回答。邀请回答 wyerwwr 该类别下有 8 个回答。邀请回答 hanyan533 该类别下有 8 个回答。邀请回答 scmywkf 该类别下有 8 个回答。邀请回答 st94wo 该类别下有 8 个回答。邀请回答 04860860686 该类别下有 8 个回答。邀请回答 vtwterwer 该类别下有 8 个回答。邀请回答 kingnet_52040 该类别下有 8 个回答。邀请回答 60user118 该类别下有 7 个回答。邀请回答 h1654155958.0499 该类别下有 7 个回答。邀请回答 chunlan83768 该类别下有 7 个回答。邀请回答 n73483852 该类别下有 7 个回答。邀请回答 C880U 该类别下有 7 个回答。邀请回答举报李妍相关推荐 • 有人需要nRF51822低功耗CPU睡眠软件应用的代码吗 1758 • 蓝牙nRF51822具有哪些特点应用？ 2076 • nRF51822蓝牙芯片量产烧录工具 13490 • Nordic nRF51822具有哪些功能特性？ 1165 • 买了一个nrf51822模块，但是手机搜不到蓝牙信号。 9316 • nrf51822运行BLE时iPad发现不了nrf51822但是通过nrf软件能连上 2137 • 为什么选择蓝牙NRF51822模块？ 1679 • NRF51802-qfaa-r,256k flash版本。 5063 • 2.4GRF协议BLE蓝牙4.0协议芯片NRF51822是什么 1820 • nRF51822与STM32可以用USART方式吗？ 1315 7个回答

答案对人有帮助，有参考价值 0 不太正確喔!system off mode 除了core停止，peripheral也是停止的，功能幾乎等同關機，RAM可以設定是否保存(需耗費額外電力)，喚醒除了power on reset，其他方式要在NRF_POWER register進行設定喚醒源(RESETREAS) 而 sd_app_evt_wait功能等同m0裡的WFE__，core停止，peripheral可以單獨運行，差別在enable softdevice時使用 sd_app_evt_wait，disable softdevice時使用WFE__ 補充一下你看得GPIO DETECT 內容是使用GPIOTE的port event觸發 WFI or WFE用的!跟喚醒system off 不同

2020-7-20 11:54:13 评论举报陈龙

此外，蓝牙好几个Demo应用软件中有个power_manage()的应用，小弟看了这是调用库函数

sd_app_evt_wait ( )

，关于这个函数nordic官网SDK提供的API手册说明如下：

uint32_t sd_app_evt_wait ( void )

Waits for an application event.

An application event is either an application interrupt or a pended
interrupt when the interrupt is disabled. When the interrupt is enabled
it will be taken immediately since this function will wait in thread
mode, then the execution will return in the application's main thread.
When an interrupt is disabled and gets pended it will return to the
application's thread main. The application must ensure that the pended
flag is cleared using sd_nvic_ClearPendingIRQ in order to sleep using this function. This is only necessary for
disabled interrupts, as the interrupt handler will clear the pending
flag automatically for enabled interrupts.

In order to wake up from disabled interrupts, the SEVONPEND flag has to be set in the Cortex-M0 System Control Register (SCR).

See AlsoCMSIS_SCBNoteIf an application interrupt
has happened since the last time sd_app_evt_wait was called this
function will return immediately and not go to sleep. This is to avoid
race conditions that can occur when a flag is updated in the interrupt
handler and processed in the main loop.PostconditionAn application interrupt has happened or a interrupt pending flag is set.Return values

NRF_SUCCESS

小弟英文水平有限，看了几遍也没看明白这个函数到底有什么作用？如何用？哪位大哥大姐大神，百忙中能抽点空，帮看看讨论讨论，拜谢哪。

2020-7-20 12:02:26 评论

孙成红

答案对人有帮助，有参考价值 0 这位大神说的非常正确，请问还在弄这款MCU芯片吗，以后希望多多指教呀！！

2020-7-20 12:28:38 评论举报赵秀英

答案对人有帮助，有参考价值 0 哪裡!聞道有先後，目前持續研究中，下周要去聽nrf52的發表啦，大家切磋切磋囉

2020-7-20 12:45:58 评论举报李淑珍

答案对人有帮助，有参考价值 0 在哪里更新了呀，给个链接呗，我时常去膜拜下，哈哈

2020-7-20 12:52:05 评论举报李翰肃

答案对人有帮助，有参考价值 0 http://www.trtos.com/web/wp/?p=792

2020-7-20 13:00:45 评论举报薛丽娜

答案对人有帮助，有参考价值 0 少年，给个链接你，希望能帮到你http://www.trtos.com/web/wp/?p=792

2020-7-20 13:15:09 评论举报杨季赟