main.cpp

00001 #include "mbed.h"
00002 #include "PowerControl/PowerControl.h"
00003 #include "PowerControl/EthernetPowerControl.h"
00004 
00005 #if 0
00006 int main() {
00007     //turn OSC1 down
00008      PHY_PowerDown();
00009      wait(5);
00010      LPC_GPIO1->FIODIR = 0x8000000;
00011      LPC_GPIO1->FIOCLR = 0x8000000;
00012      wait(5);
00013      LPC_GPIO1->FIOSET = 0x8000000;
00014      wait(5);
00015      PHY_PowerUp();
00016 }
00017 #else
00018 // Need PowerControl *.h files from this URL
00019 // http://mbed.org/users/no2chem/notebook/mbed-power-controlconsumption/
00020  
00021 // Function to power down magic USB interface chip with new firmware
00022 #define USR_POWERDOWN    (0x104)
00023 int semihost_powerdown() {
00024     uint32_t arg;
00025     return __semihost(USR_POWERDOWN, &arg);
00026 }
00027  
00028 DigitalOut myled1(LED1);
00029 DigitalOut myled2(LED2);
00030 DigitalOut myled3(LED3);
00031 DigitalOut myled4(LED4);
00032  
00033 Ticker blinker;
00034 int count=1;
00035  
00036 void blink() {
00037     count = count << 1;
00038     if (count > 0x08) count = 0x01;
00039     myled1 = count & 0x01;
00040     myled2 = count & 0x02;
00041     myled3 = count & 0x04;
00042     myled4 = count & 0x08;
00043 }
00044  
00045 int main() {
00046     int result;
00047 // Normal mbed power level for this setup is around 690mW
00048 // assuming 5V used on Vin pin
00049 // If you don't need networking...
00050 // Power down Ethernet interface - saves around 175mW
00051 // Also need to unplug network cable - just a cable sucks power
00052     PHY_PowerDown();
00053  
00054 // If you don't need the PC host USB interface....
00055 // Power down magic USB interface chip - saves around 150mW
00056 // Needs new firmware (URL below) and USB cable not connected
00057 // http://mbed.org/users/simon/notebook/interface-powerdown/
00058 // Supply power to mbed using Vin pin
00059     result = semihost_powerdown();
00060 // Power consumption is now around half
00061  
00062 // Turn off clock enables on unused I/O Peripherals (UARTs, Timers, PWM, SPI, CAN, I2C, A/D...)
00063 // To save just a tiny bit more power - most are already off by default in this short code example
00064 // See PowerControl.h for I/O device bit assignments
00065 // Don't turn off GPIO - it is needed to blink the LEDs
00066     Peripheral_PowerDown(0xFFFF7FFF);
00067  
00068 // use Ticker interrupt and Sleep instead of a wait for time delay - saves up to 70mW
00069 // Sleep halts and waits for an interrupt instead of executing instructions
00070 // power is saved by not constantly fetching and decoding instructions
00071 // Exact power level reduction depends on the amount of time spent in Sleep mode
00072     blinker.attach(&blink, 0.625);//0.0625 almost no difference 
00073     while (1) {
00074         //Sleep();
00075         DeepSleep();
00076         //PowerDown();
00077         //DeepPowerDown();     
00078     }
00079 }
00080 #endif