deep sleep and wake-up. WDT interrupt sample. see: http://mbed.org/users/okini3939/notebook/low-power-m0/
Revision 0:766ef51c9b11, committed 2014-07-08
- Comitter:
- okini3939
- Date:
- Tue Jul 08 05:57:10 2014 +0000
- Commit message:
- 1st build
Changed in this revision
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r 766ef51c9b11 main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Tue Jul 08 05:57:10 2014 +0000 @@ -0,0 +1,85 @@ +#include "mbed.h" + +DigitalOut led1(LED1), led2(LED2), led3(LED3), led4(LED4); + +Serial pc(USBTX, USBRX); + +extern "C" +void WDT_IRQHandler(void) { + LPC_WWDT->MOD |= (1<<3); + LPC_WWDT->MOD &= ~(1<<2); + led2 = !led2; +} + +void initWDT (float s) { + LPC_SYSCON->SYSAHBCLKCTRL |= (1<<15); + LPC_SYSCON->PDRUNCFG &= ~(1<<6); // WDT on + LPC_SYSCON->PDSLEEPCFG &= ~(1<<6); // WDT on + LPC_SYSCON->WDTOSCCTRL = (1<<5)|(0x1f<<0); // 500kHz / 64 + + LPC_WWDT->CLKSEL = (1<<0); // Set CLK src to PCLK + uint32_t clk = 500000 / 64 / 4; // WD has a fixed /4 prescaler, PCLK default is /4 + LPC_WWDT->TC = s * (float)clk; + LPC_WWDT->WARNINT = 0; + LPC_WWDT->MOD = (1<<0); // Enabled but Reset disable + + LPC_WWDT->FEED = 0xAA; + LPC_WWDT->FEED = 0x55; + + LPC_SYSCON->STARTERP1 |= (1<<12); + NVIC_ClearPendingIRQ(WDT_IRQn); + NVIC_EnableIRQ(WDT_IRQn); +} + +void PowerDown () { + LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG; + LPC_PMU->PCON = (2<<0); + SCB->SCR |= (1<<2); + __WFI(); +} + +void DeepSleep () { + LPC_SYSCON->PDAWAKECFG = LPC_SYSCON->PDRUNCFG; + LPC_PMU->PCON = (1<<0); + SCB->SCR |= (1<<2); + __WFI(); +} + +void Sleep () { + LPC_PMU->PCON = 0; + SCB->SCR &= ~(1<<2); + __WFI(); +} + +int main() { + int i; + + pc.baud(9600); + pc.printf("low power\r\n"); + + for (i = 0; i < 6; i ++) { + led1 = !led1; + wait(0.2); + } + + for (;;) { + + pc.printf("enter sleep\r\n"); + wait_ms(10); + + initWDT(1); + wait_ms(10); +// Sleep(); + DeepSleep(); +// PowerDown(); + + pc.printf("wake up\r\n"); + for (i = 0; i < 6; i ++) { + led1 = !led1; + wait(0.2); + } + + for (;;); + + } +}
diff -r 000000000000 -r 766ef51c9b11 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Jul 08 05:57:10 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/04dd9b1680ae \ No newline at end of file