April 2020
Intermediate to advanced
412 pages
9h 58m
English
Content preview from Embedded Programming with Modern C++ Cookbook
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How to do it...
In this recipe, we will set a wake-up time to 1 minute in advance and put the system to sleep:
- Log in to any Linux system that has an RTC clock—any Linux laptop can work. Unfortunately, Raspberry Pi does not have an onboard RTC, and cannot be woken up without additional hardware.
- Get root permissions using sudo:
$ sudo bash#
- Instruct RTC to wake up the system in 1 minute:
# date '+%s' -d '+1 minute' > /sys/class/rtc/rtc0/wakealarm
- Put the system to sleep:
# echo freeze > /sys/power/state
- Wait for a minute. Your system will wake up.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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