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At this time, the power consumption goes down dramatically and should measure about 5 mA @3.3V.
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3. Resuming from Low Power Mode
Press the BTN1 User Button on the STM32H7-BSB board to wake the system up:
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/ # ping 192.168.1.1& [1] 64 ping 192.168.1.1 / # PING 192.168.1.1 (192.168.1.1): 56 data bytes 64 bytes from 192.168.1.1: seq=0 ttl=64 time=3.880 ms 64 bytes from 192.168.1.1: seq=1 ttl=64 time=1.974 ms 64 bytes from 192.168.1.1: seq=6 ttl=64 time=1.927 ms / # echo mem > sys/power/state [ 38.682054] PM: suspend entry (deep) [ 38.684774] Filesystems sync: 0.000 seconds [ 38.688727] Freezing user space processes [ 38.694276] Freezing user space processes completed (elapsed 0.001 seconds) [ 38.700091] OOM killer disabled. [ 38.703263] Freezing remaining freezable tasks [ 38.709326] Freezing remaining freezable tasks completed (elapsed 0.001 seconds) [ 38.715668] printk: Suspending console(s) (use no_console_suspend to debug) [ 38.725384] stm32-dwmac 40028000.ethernet eth0: Link is Down [ 38.742262] stm32-dwmac 40028000.ethernet eth0: No Safety Features support found [ 38.742718] stm32-dwmac 40028000.ethernet eth0: IEEE 1588-2008 Advanced Timestamp supported [ 38.743246] stm32-dwmac 40028000.ethernet eth0: configuring for phy/rmii link mode [ 38.828547] OOM killer enabled. [ 38.831592] Restarting tasks ... done. [ 38.835563] PM: suspend exit / # [ 41.843648] stm32-dwmac 40028000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx 64 bytes from 192.168.1.1: seq=10 ttl=64 time=2069.568 ms 64 bytes from 192.168.1.1: seq=11 ttl=64 time=1068.468 ms 64 bytes from 192.168.1.1: seq=12 ttl=64 time=67.962 ms 64 bytes from 192.168.1.1: seq=13 ttl=64 time=1.983 ms 64 bytes from 192.168.1.1: seq=14 ttl=64 time=1.929 ms |
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4. Configuring GPIO Key as a Wake-up Source
The default trigger used for system wake-up is the BTN1 User Button on the STM32H7-BSB development board. It is connected to the PH.2 GPIO on the STM32H7. The button is configured in the rootfs.dts file correspondingly. The button-1 node in gpio-keys specifies the gpio-key,wakeup property to enable wake-up from this pin:
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