Andy A / WakeUp

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Fork of WakeUp by Erik -

Device/WakeUp_LPC11u24.cpp@19:c1fc9bb48d2b, 2015-06-25 (annotated)

Committer:
AndyA
Date:
Thu Jun 25 08:22:40 2015 +0000
Revision:
19:c1fc9bb48d2b
Parent:
18:e71f388710b7
Child:
20:1bd0c314f043
Fixed sign issue

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;
AndyA 18:e71f388710b7 14 uint32_t WakeUp::timeoutSet = 0;
Sissors 4:ec26a6713bb9 15
Sissors 4:ec26a6713bb9 16 void WakeUp::set_ms(uint32_t ms)
Sissors 4:ec26a6713bb9 17 {
Sissors 4:ec26a6713bb9 18 if (ms != 0) {
Sissors 4:ec26a6713bb9 19 LPC_SYSCON->SYSAHBCLKCTRL |= 0x8000;
Sissors 4:ec26a6713bb9 20 LPC_SYSCON->PDRUNCFG &= ~(1<<6);
Sissors 4:ec26a6713bb9 21 LPC_SYSCON->PDSLEEPCFG &= ~(1<<6);
Sissors 4:ec26a6713bb9 22 LPC_SYSCON->STARTERP1 |= 1<<12;
AndyA 18:e71f388710b7 23
Sissors 4:ec26a6713bb9 24 //Set oscillator for 20kHz = 5kHz after divide by 4 in WDT
Sissors 4:ec26a6713bb9 25 LPC_SYSCON->WDTOSCCTRL = 14 | (1<<5);
AndyA 18:e71f388710b7 26
Sissors 4:ec26a6713bb9 27 LPC_WWDT->MOD = 1; //Enable WDT
AndyA 18:e71f388710b7 28 timeoutSet = (uint32_t)((float)ms * cycles_per_ms);
AndyA 18:e71f388710b7 29 LPC_WWDT->TC = timeoutSet;
Sissors 4:ec26a6713bb9 30 LPC_WWDT->CLKSEL = 1; //WDTOSC
Sissors 4:ec26a6713bb9 31 LPC_WWDT->WARNINT = 0;
AndyA 18:e71f388710b7 32
Sissors 4:ec26a6713bb9 33 NVIC_SetVector(WDT_IRQn, (uint32_t)WakeUp::irq_handler);
AndyA 18:e71f388710b7 34
Sissors 4:ec26a6713bb9 35 //Feeeeeed me
Sissors 4:ec26a6713bb9 36 LPC_WWDT->FEED = 0xAA;
Sissors 4:ec26a6713bb9 37 LPC_WWDT->FEED = 0x55;
AndyA 18:e71f388710b7 38
Sissors 4:ec26a6713bb9 39 NVIC_EnableIRQ(WDT_IRQn);
Sissors 4:ec26a6713bb9 40 } else
Sissors 4:ec26a6713bb9 41 NVIC_DisableIRQ(WDT_IRQn);
AndyA 18:e71f388710b7 42
Sissors 4:ec26a6713bb9 43 }
Sissors 4:ec26a6713bb9 44
Sissors 4:ec26a6713bb9 45 void WakeUp::irq_handler(void)
Sissors 4:ec26a6713bb9 46 {
Sissors 4:ec26a6713bb9 47 LPC_WWDT->MOD = 1<<3;
Sissors 4:ec26a6713bb9 48 callback.call();
Sissors 4:ec26a6713bb9 49 }
Sissors 4:ec26a6713bb9 50
Sissors 4:ec26a6713bb9 51 void WakeUp::calibrate(void)
Sissors 4:ec26a6713bb9 52 {
Sissors 4:ec26a6713bb9 53 cycles_per_ms = 5.0;
Sissors 4:ec26a6713bb9 54 set_ms(1100);
Sissors 4:ec26a6713bb9 55 wait_ms(10); //Give time to sync
Sissors 4:ec26a6713bb9 56 uint32_t count1 = LPC_WWDT->TV;
Sissors 4:ec26a6713bb9 57 wait_ms(100);
Sissors 4:ec26a6713bb9 58 uint32_t count2 = LPC_WWDT->TV;
Sissors 4:ec26a6713bb9 59 set_ms(0);
Sissors 4:ec26a6713bb9 60 count1 = count1 - count2;
AndyA 18:e71f388710b7 61
Sissors 4:ec26a6713bb9 62 cycles_per_ms = count1 / 100.0;
Sissors 4:ec26a6713bb9 63 }
Sissors 4:ec26a6713bb9 64
AndyA 19:c1fc9bb48d2b 65 float WakeUp::timeRemaining(void)
AndyA 18:e71f388710b7 66 {
AndyA 19:c1fc9bb48d2b 67 return (timeoutSet - LPC_WWDT->TV) / (cycles_per_ms*1000);
AndyA 18:e71f388710b7 68 }
AndyA 18:e71f388710b7 69
Sissors 4:ec26a6713bb9 70 #endif