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//go:build nrf && softdevice
// +build nrf,softdevice
package runtime
import (
"device/arm"
"device/nrf"
)
//export sd_app_evt_wait
func sd_app_evt_wait()
// This is a global variable to avoid a heap allocation in waitForEvents.
var softdeviceEnabled uint8
func waitForEvents() {
// Call into the SoftDevice to sleep. This is necessary here because a
// normal wfe will not put the chip in low power mode (it still consumes
// 500µA-1mA). It is really needed to call sd_app_evt_wait for low power
// consumption.
// First check whether the SoftDevice is enabled. Unfortunately,
// sd_app_evt_wait cannot be called when the SoftDevice is not enabled.
arm.SVCall1(0x12, &softdeviceEnabled) // sd_softdevice_is_enabled
if softdeviceEnabled != 0 {
// Now pick the appropriate SVCall number. Hopefully they won't change
// in the future with a different SoftDevice version.
if nrf.Device == "nrf51" {
// sd_app_evt_wait: SOC_SVC_BASE_NOT_AVAILABLE + 29
arm.SVCall0(0x2B + 29)
} else if nrf.Device == "nrf52" || nrf.Device == "nrf52840" || nrf.Device == "nrf52833" {
// sd_app_evt_wait: SOC_SVC_BASE_NOT_AVAILABLE + 21
arm.SVCall0(0x2C + 21)
} else {
sd_app_evt_wait()
}
} else {
// SoftDevice is disabled so we can sleep normally.
arm.Asm("wfe")
}
}
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