Andy A / mBuino_Sleep_Minimal

Minimal version of mBuino Sleep

This is a cut down version of mBuino_Sleep that doesn't control any IO lines.

This version should work fine on any NXP LPC11Uxx CPUs although you will need to check the external pin pullup/down status, any conflicts between external and internal pulls will increase power usage.

If using this version on an mBuino ensure you disable the pullup on P0_3 (on by default for any unconfigured GPIO lines) and turn all the LEDs off before entering sleep. Failing to do so will increase the sleep mode power draw.

See mBuino_Sleep for usage details.

mBuinoSleep.cpp@2:9c5cd0f7aa8a, 2014-09-28 (annotated)

Committer:
AndyA
Date:
Sun Sep 28 09:24:32 2014 +0000
Revision:
2:9c5cd0f7aa8a
Parent:
1:219e1147c6fa 
Added watchdog modes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AndyA 0:af76f9a302ea 1 #include "mBuinoSleep.h"
AndyA 0:af76f9a302ea 2
AndyA 0:af76f9a302ea 3 void mBuinoSleep(enum sleepMode_t mode)
AndyA 0:af76f9a302ea 4 {
AndyA 1:219e1147c6fa 5
AndyA 1:219e1147c6fa 6 if ((mode == DeepPowerDown) && (LPC_PMU->PCON & 0x08)) // bit 3 high blocks deep power down.
AndyA 1:219e1147c6fa 7 mode = PowerDown;
AndyA 1:219e1147c6fa 8
AndyA 0:af76f9a302ea 9 switch (mode) {
AndyA 0:af76f9a302ea 10 default:
AndyA 0:af76f9a302ea 11 case Sleep:
AndyA 0:af76f9a302ea 12 LPC_PMU->PCON = 0x0;
AndyA 0:af76f9a302ea 13 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
AndyA 0:af76f9a302ea 14 __WFI();
AndyA 0:af76f9a302ea 15 break;
AndyA 0:af76f9a302ea 16
AndyA 0:af76f9a302ea 17 case DeepSleep:
AndyA 2:9c5cd0f7aa8a 18 case PowerDown:
AndyA 2:9c5cd0f7aa8a 19 case PowerDownWD:
AndyA 2:9c5cd0f7aa8a 20 case DeepSleepWD: {
AndyA 2:9c5cd0f7aa8a 21 if ((mode == PowerDown) || (mode == PowerDownWD))
AndyA 0:af76f9a302ea 22 LPC_PMU->PCON = 0x2;
AndyA 0:af76f9a302ea 23 else
AndyA 0:af76f9a302ea 24 LPC_PMU->PCON = 0x1;
AndyA 0:af76f9a302ea 25
AndyA 0:af76f9a302ea 26 LPC_SYSCON->PDSLEEPCFG |= 0x7f; // shut off everything we can.
AndyA 2:9c5cd0f7aa8a 27
AndyA 2:9c5cd0f7aa8a 28 if ((mode == DeepSleepWD) || (mode == PowerDownWD))
AndyA 2:9c5cd0f7aa8a 29 LPC_SYSCON->PDSLEEPCFG &= ~(1<<6);
AndyA 2:9c5cd0f7aa8a 30
AndyA 0:af76f9a302ea 31 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
AndyA 0:af76f9a302ea 32
AndyA 0:af76f9a302ea 33 bool IRCPowered = (LPC_SYSCON->PDRUNCFG & 0x01); // only used for cleen shutdown but defined here for scope reasons.
AndyA 0:af76f9a302ea 34 if (!IRCPowered)
AndyA 0:af76f9a302ea 35 LPC_SYSCON->PDRUNCFG &= 0xfffffffe; // power up the IRC
AndyA 0:af76f9a302ea 36
AndyA 0:af76f9a302ea 37 if(sleep_CleanShutdown) {
AndyA 0:af76f9a302ea 38 LPC_SYSCON->MAINCLKSEL = 0x00; // switch to IRC to avoid glitches
AndyA 0:af76f9a302ea 39 LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */
AndyA 0:af76f9a302ea 40 LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */
AndyA 0:af76f9a302ea 41 LPC_SYSCON->MAINCLKUEN = 0x01;
AndyA 0:af76f9a302ea 42 while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */
AndyA 0:af76f9a302ea 43 }
AndyA 0:af76f9a302ea 44
AndyA 0:af76f9a302ea 45 LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG; // switch on everything that is currently on when we wake up.
AndyA 0:af76f9a302ea 46 __WFI();
AndyA 0:af76f9a302ea 47
AndyA 0:af76f9a302ea 48 if(sleep_CleanShutdown) {
AndyA 0:af76f9a302ea 49 LPC_SYSCON->MAINCLKSEL = 0x03; // switch to PLL output
AndyA 0:af76f9a302ea 50 LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */
AndyA 0:af76f9a302ea 51 LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */
AndyA 0:af76f9a302ea 52 LPC_SYSCON->MAINCLKUEN = 0x01;
AndyA 0:af76f9a302ea 53 while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */
AndyA 0:af76f9a302ea 54 }
AndyA 0:af76f9a302ea 55
AndyA 0:af76f9a302ea 56 if (!IRCPowered)
AndyA 0:af76f9a302ea 57 LPC_SYSCON->PDRUNCFG |= 0x01; // power down the IRC if it was off before
AndyA 0:af76f9a302ea 58 }
AndyA 0:af76f9a302ea 59 break;
AndyA 1:219e1147c6fa 60 case DeepPowerDown:
AndyA 1:219e1147c6fa 61 LPC_PMU->PCON = 0x3;
AndyA 1:219e1147c6fa 62 LPC_SYSCON->PDSLEEPCFG |= 0x7f; // shut off everything we can.
AndyA 1:219e1147c6fa 63 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
AndyA 1:219e1147c6fa 64 __WFI();
AndyA 0:af76f9a302ea 65 }
AndyA 0:af76f9a302ea 66 }