<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I made a little progress by looking at this post: <a href="https://forum.arduino.cc/index.php?topic=420453.0" class="">https://forum.arduino.cc/index.php?topic=420453.0</a><div class=""><br class=""></div><div class="">I first moved my external interrupt over to A0, which is EINT2, and doesn’t seem to be shared by anything important. Then I added the following to my code:</div><div class=""><br class=""></div><div class="">REG_EIC_INTENSET = EIC_INTENSET_EXTINT2;</div><div class=""><br class=""></div><div class="">before the attachInterrupt()</div><div class=""><br class=""></div><div class="">and</div><div class=""><br class=""></div><div class="">REG_EIC_INTENCLR = EIC_INTENCLR_EXTINT2;</div><div class=""><br class=""></div><div class="">in the handler on wake. This seems to get things working, but not consistently. Sometimes it will wake up via tapping the accelerometer (as I want), and sometimes it acts like it’s not going to sleep at all.</div><div class=""><br class=""></div><div class="">Oh btw I had to do the following before calling __WFI() to get sleep to work at all:</div><div class=""><br class=""></div><div class=""><div class=""> //set System Control Register (SCR) sleep bit to deep sleep (do once so wfi (wait for intyerrupt) in loop waits)</div><div class=""> //There are 2 sleep modes, idle and standby (deep) Sleep bit is SCR bit 2, 0 is idle, 1 is standby</div><div class=""> // SCB->SCR |= 0b00000100; //just a test to see how to code binary--this works</div><div class=""> SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk; // set to deep sleep (bit-1) by ORing with 100</div><div class=""> //SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk; //set to idle (bit=0) by ANDing with the inverse of above--leaves all bita alone except sleep, which ANDs to 0</div><div class=""> // SCB->SCR &= 0b11111011; //another test</div><div class=""> //There are 3 idle modes, 0 (CPU),1 (CPU,AHB clock),2 (CPU,AHB,APB). Set this if using IDLE</div><div class=""> PM->SLEEP.reg |= PM_SLEEP_IDLE_APB; //idle turn off CPU, AFB, APB //Advanced Peripheral Bus (APB) Advanced High-performance Bus (AHB)</div><div class=""><br class=""></div><div class="">M0 support is definitely still beta. Too bad.</div><div class="">
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