teralytic / WakeUp

wake library

Dependencies:   LPC1114_WakeInterruptIn

Fork of WakeUp by Erik -

Device/WakeUp_LPC11u24.cpp@23:a443fbaba1da, 2016-10-17 (annotated)

Committer:
rodriguise
Date:
Mon Oct 17 19:59:49 2016 +0000
Revision:
23:a443fbaba1da
Parent:
7:bb411115f814 
backup

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Sissors 4:ec26a6713bb9 1 /**
Sissors 4:ec26a6713bb9 2 Due to lack of another option for the LPC11u24 the watchdog timer is used as wakeup source.
Sissors 4:ec26a6713bb9 3 Since if the reset on watchdog event bit is set, I cannot remove it again, this means if you also got watchdog code running
Sissors 4:ec26a6713bb9 4 the most likely result is that it just resets your board.
Sissors 4:ec26a6713bb9 5 **/
Sissors 4:ec26a6713bb9 6
Sissors 4:ec26a6713bb9 7
Sissors 4:ec26a6713bb9 8 #ifdef TARGET_LPC11U24
Sissors 4:ec26a6713bb9 9
Sissors 4:ec26a6713bb9 10 #include "WakeUp.h"
Sissors 4:ec26a6713bb9 11
Sissors 4:ec26a6713bb9 12 FunctionPointer WakeUp::callback;
Sissors 4:ec26a6713bb9 13 float WakeUp::cycles_per_ms = 5.0;
Sissors 4:ec26a6713bb9 14
Sissors 4:ec26a6713bb9 15 void WakeUp::set_ms(uint32_t ms)
Sissors 4:ec26a6713bb9 16 {
Sissors 4:ec26a6713bb9 17 if (ms != 0) {
Sissors 4:ec26a6713bb9 18 LPC_SYSCON->SYSAHBCLKCTRL |= 0x8000;
Sissors 4:ec26a6713bb9 19 LPC_SYSCON->PDRUNCFG &= ~(1<<6);
Sissors 4:ec26a6713bb9 20 LPC_SYSCON->PDSLEEPCFG &= ~(1<<6);
Sissors 4:ec26a6713bb9 21 LPC_SYSCON->STARTERP1 |= 1<<12;
Sissors 4:ec26a6713bb9 22
Sissors 4:ec26a6713bb9 23 //Set oscillator for 20kHz = 5kHz after divide by 4 in WDT
Sissors 4:ec26a6713bb9 24 LPC_SYSCON->WDTOSCCTRL = 14 | (1<<5);
Sissors 4:ec26a6713bb9 25
Sissors 4:ec26a6713bb9 26 LPC_WWDT->MOD = 1; //Enable WDT
Sissors 4:ec26a6713bb9 27 LPC_WWDT->TC = (uint32_t)((float)ms * cycles_per_ms);
Sissors 4:ec26a6713bb9 28 LPC_WWDT->CLKSEL = 1; //WDTOSC
Sissors 4:ec26a6713bb9 29 LPC_WWDT->WARNINT = 0;
Sissors 4:ec26a6713bb9 30
Sissors 4:ec26a6713bb9 31 NVIC_SetVector(WDT_IRQn, (uint32_t)WakeUp::irq_handler);
Sissors 4:ec26a6713bb9 32
Sissors 4:ec26a6713bb9 33 //Feeeeeed me
Sissors 4:ec26a6713bb9 34 LPC_WWDT->FEED = 0xAA;
Sissors 4:ec26a6713bb9 35 LPC_WWDT->FEED = 0x55;
Sissors 4:ec26a6713bb9 36
Sissors 4:ec26a6713bb9 37 NVIC_EnableIRQ(WDT_IRQn);
Sissors 4:ec26a6713bb9 38 } else
Sissors 4:ec26a6713bb9 39 NVIC_DisableIRQ(WDT_IRQn);
Sissors 4:ec26a6713bb9 40
Sissors 4:ec26a6713bb9 41 }
Sissors 4:ec26a6713bb9 42
Sissors 4:ec26a6713bb9 43 void WakeUp::irq_handler(void)
Sissors 4:ec26a6713bb9 44 {
Sissors 4:ec26a6713bb9 45 LPC_WWDT->MOD = 1<<3;
Sissors 4:ec26a6713bb9 46 callback.call();
Sissors 4:ec26a6713bb9 47 }
Sissors 4:ec26a6713bb9 48
Sissors 4:ec26a6713bb9 49 void WakeUp::calibrate(void)
Sissors 4:ec26a6713bb9 50 {
Sissors 4:ec26a6713bb9 51 cycles_per_ms = 5.0;
Sissors 4:ec26a6713bb9 52 set_ms(1100);
Sissors 4:ec26a6713bb9 53 wait_ms(10); //Give time to sync
Sissors 4:ec26a6713bb9 54 uint32_t count1 = LPC_WWDT->TV;
Sissors 4:ec26a6713bb9 55 wait_ms(100);
Sissors 4:ec26a6713bb9 56 uint32_t count2 = LPC_WWDT->TV;
Sissors 4:ec26a6713bb9 57 set_ms(0);
Sissors 4:ec26a6713bb9 58 count1 = count1 - count2;
Sissors 4:ec26a6713bb9 59
Sissors 4:ec26a6713bb9 60 cycles_per_ms = count1 / 100.0;
Sissors 4:ec26a6713bb9 61 }
Sissors 4:ec26a6713bb9 62
Sissors 4:ec26a6713bb9 63 #endif