![](/media/cache/profiles/f095cedd23b99f1696fc8caecbcf257e.jpg.50x50_q85.jpg)
deep sleep and wake-up. GPIO group interrupt, start logic sample see: http://mbed.org/users/okini3939/notebook/low-power-m0/
Diff: main.cpp
- Revision:
- 0:ae90ac40c518
- Child:
- 1:d676ec86101e
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Mon Oct 15 05:07:10 2012 +0000 @@ -0,0 +1,97 @@ +#include "mbed.h" + +DigitalOut myled(LED1); + +Serial pc(p9, p10); + +void initStartLogic (unsigned int p0, unsigned int p1) { + LPC_SYSCON->SYSAHBCLKCTRL |= (1<<24); + LPC_GPIO_GROUP_INT1->PORT_POL[0] = 0; + LPC_GPIO_GROUP_INT1->PORT_POL[1] = 0; + LPC_GPIO_GROUP_INT1->PORT_ENA[0] = p0; + LPC_GPIO_GROUP_INT1->PORT_ENA[1] = p1; + LPC_GPIO_GROUP_INT1->CTRL = 0; // Edge, OR, INT + + LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG; + + LPC_SYSCON->STARTERP1 = (1<<21); // start logic GROUP1 + NVIC_ClearPendingIRQ(GINT1_IRQn); + NVIC_EnableIRQ(GINT1_IRQn); +} + +unsigned int setSystemMainClock(unsigned short S) { + + if ((S & 0x03) == 3) { + LPC_SYSCON->PDRUNCFG &= ~(1 << 5); /* Power-up System Osc */ + for (int i = 0; i < 200; i++) __NOP(); + } + + LPC_SYSCON->MAINCLKSEL = S; /* Select PLL Clock Output */ + LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */ + LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */ + LPC_SYSCON->MAINCLKUEN = 0x01; + while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */ + + if ((S & 0x03) == 0) { + LPC_SYSCON->PDRUNCFG |= (1 << 5); /* Power-down System Osc */ + } + + SystemCoreClockUpdate(); + return SystemCoreClock; +} + +unsigned int setSystemFrequency(unsigned short M, unsigned short P) { + LPC_SYSCON->SYSPLLCTRL = ((P & 0x03)<<5) | (M & 0x1f); + while (!(LPC_SYSCON->SYSPLLSTAT & 0x01)); // Wait Until PLL Locked + SystemCoreClockUpdate(); + return SystemCoreClock; +} + +void DeepSleep () { + SCB->SCR |= (1<<2); + __WFI(); +} + +void Sleep () { + __WFI(); +} + +extern "C" +void GINT1_IRQHandler(void) { + LPC_GPIO_GROUP_INT1->CTRL |= (1<<0); + NVIC_ClearPendingIRQ(GINT0_IRQn); +} + +int main() { + int i; + +// setSystemFrequency(3, 1); // M, P, 48MHz + + pc.baud(9600); + pc.printf("low power\r\n"); + + for (i = 0; i < 6; i ++) { + myled = !myled; + wait(0.5); + } + + initStartLogic((1<<8), 0); + +loop: + pc.printf("enter sleep\r\n"); + wait_ms(10); + setSystemMainClock(0); + + DeepSleep(); + + setSystemMainClock(3); + + pc.printf("wake up\r\n"); + for (i = 0; i < 6; i ++) { + myled = !myled; + wait(0.5); + } + + goto loop; + +}