Wakeup from sleep with GPIO (not reset)

[Andyi]

 I would like to put a nrf51822 device into system sleep (not off) mode and wake it up (not reset) with a GPIO transition from high to low. I used SDK(nRF5_SDK_12.2.0_f012efa) and the project：

nRF5_SDK_12.2.0_f012efa\examples\ble_peripheral\ble_app_uart\pca10028\s130\arm4， How to modify the code ?   thk

[Bjørn Kvaale]

Do you want to put the system in system on low power mode (see the nrf51822 product specification doc for more info)?

This devzone case should also be helpful, even though it is based on the 52832 & not the 51822 (much of the power management has remained the same). The ble_app_uart code already calls power_manage() inside the main function, which calls sd_app_evt_wait(). sd_app_evt_wait() puts the nrf51 into system on low power mode. You can then wake the chip using GPIOTE interrupts. This case might also be helpful.