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@0:af76f9a302ea, 2014-09-21 (annotated)

Committer:
AndyA
Date:
Sun Sep 21 11:02:19 2014 +0000
Revision:
0:af76f9a302ea
Child:
1:219e1147c6fa
first commit;

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 0:af76f9a302ea 5 switch (mode) {
AndyA 0:af76f9a302ea 6 default:
AndyA 0:af76f9a302ea 7 case Sleep:
AndyA 0:af76f9a302ea 8 LPC_PMU->PCON = 0x0;
AndyA 0:af76f9a302ea 9 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
AndyA 0:af76f9a302ea 10 __WFI();
AndyA 0:af76f9a302ea 11 break;
AndyA 0:af76f9a302ea 12
AndyA 0:af76f9a302ea 13 case DeepSleep:
AndyA 0:af76f9a302ea 14 case PowerDown: {
AndyA 0:af76f9a302ea 15 if (mode == PowerDown)
AndyA 0:af76f9a302ea 16 LPC_PMU->PCON = 0x2;
AndyA 0:af76f9a302ea 17 else
AndyA 0:af76f9a302ea 18 LPC_PMU->PCON = 0x1;
AndyA 0:af76f9a302ea 19
AndyA 0:af76f9a302ea 20 LPC_SYSCON->PDSLEEPCFG |= 0x7f; // shut off everything we can.
AndyA 0:af76f9a302ea 21 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
AndyA 0:af76f9a302ea 22
AndyA 0:af76f9a302ea 23 bool IRCPowered = (LPC_SYSCON->PDRUNCFG & 0x01); // only used for cleen shutdown but defined here for scope reasons.
AndyA 0:af76f9a302ea 24 if (!IRCPowered)
AndyA 0:af76f9a302ea 25 LPC_SYSCON->PDRUNCFG &= 0xfffffffe; // power up the IRC
AndyA 0:af76f9a302ea 26
AndyA 0:af76f9a302ea 27 if(sleep_CleanShutdown) {
AndyA 0:af76f9a302ea 28 LPC_SYSCON->MAINCLKSEL = 0x00; // switch to IRC to avoid glitches
AndyA 0:af76f9a302ea 29 LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */
AndyA 0:af76f9a302ea 30 LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */
AndyA 0:af76f9a302ea 31 LPC_SYSCON->MAINCLKUEN = 0x01;
AndyA 0:af76f9a302ea 32 while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */
AndyA 0:af76f9a302ea 33 }
AndyA 0:af76f9a302ea 34
AndyA 0:af76f9a302ea 35 LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG; // switch on everything that is currently on when we wake up.
AndyA 0:af76f9a302ea 36 __WFI();
AndyA 0:af76f9a302ea 37
AndyA 0:af76f9a302ea 38 if(sleep_CleanShutdown) {
AndyA 0:af76f9a302ea 39 LPC_SYSCON->MAINCLKSEL = 0x03; // switch to PLL output
AndyA 0:af76f9a302ea 40 LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */
AndyA 0:af76f9a302ea 41 LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */
AndyA 0:af76f9a302ea 42 LPC_SYSCON->MAINCLKUEN = 0x01;
AndyA 0:af76f9a302ea 43 while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */
AndyA 0:af76f9a302ea 44 }
AndyA 0:af76f9a302ea 45
AndyA 0:af76f9a302ea 46 if (!IRCPowered)
AndyA 0:af76f9a302ea 47 LPC_SYSCON->PDRUNCFG |= 0x01; // power down the IRC if it was off before
AndyA 0:af76f9a302ea 48 }
AndyA 0:af76f9a302ea 49 break;
AndyA 0:af76f9a302ea 50 }
AndyA 0:af76f9a302ea 51 }