Diff: main.cpp

Revision:

1:9ec2b510c2b1

Parent:

0:9bd5f1bdb845

--- a/main.cpp	Sat Jan 30 02:23:30 2010 +0000
+++ b/main.cpp	Wed Feb 14 08:53:47 2018 +0000
@@ -1,15 +1,103 @@
 #include "mbed.h"
+#include "RTC.h"
 #include "PowerControl/PowerControl.h"
 #include "PowerControl/EthernetPowerControl.h"
 
+#define USR_POWERDOWN    (0x104)
+int semihost_powerdown() {
+    uint32_t arg;
+    return __semihost(USR_POWERDOWN, &arg);
+}
+
+ 
+DigitalOut myled1(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut myled4(LED4);
+ 
+int volatile count;
+ 
+// Simon's Watchdog code from
+// http://mbed.org/forum/mbed/topic/508/
+class Watchdog {
+public:
+// Load timeout value in watchdog timer and enable //Register descriptions in the manual
+    void kick(float s) {
+        LPC_WDT->WDCLKSEL = 0x02;               // Set CLK src to RTC for DeepSleep wakeup; RTC runs on 32kHz
+        LPC_WDT->WDTC = (s/4.0)*32768;          // Timeout value in 32bit register in terms of RTC ticks
+        LPC_WDT->WDMOD = 0x3;                   // Enabled register(0) and Reset register(1)
+        kick();
+    }
+// "kick" or "feed" the dog - reset the watchdog timer
+// by writing this required bit pattern. If wrong sequence is used, a RESET is triggeered
+    void kick() {
+        LPC_WDT->WDFEED = 0xAA;
+        LPC_WDT->WDFEED = 0x55;
+    }
+};
+ 
+// Setup the watchdog timer
+Watchdog wdt;
+ 
+// Blink LED
+void blink() {
+    myled4 = 0;
+    myled1 = 1;
+}
+Serial pc(USBTX, USBRX);
 int main() {
-    //turn OSC1 down
-     PHY_PowerDown();
-     wait(5);
-     LPC_GPIO1->FIODIR = 0x8000000;
-     LPC_GPIO1->FIOCLR = 0x8000000;
-     wait(5);
-     LPC_GPIO1->FIOSET = 0x8000000;
-     wait(5);
-     PHY_PowerUp();
+    set_time(1256729737);
+    //RTC::attach(&blink, RTC::Second);
+    //Serial pc(USBTX, USBRX);
+    int result;
+    //Watchdog wdt;
+    //pc.printf("Hello World!\n");
+    
+// On reset, determine if a watchdog, power on reset or a pushbutton caused reset and display on LED 4 or 3
+// Check reset source register
+    result = LPC_SC->RSID;
+    if ((result & 0x03 )==0) {
+// was not POR or reset pushbutton so
+// Mbed is out of debug mode and reset so can enter DeepSleep now and wakeup using watchdog
+        //myled4 = 1;
+        wait(.0625);
+        //wdt.kick(2);
+        //blink();
+        tm t = RTC::getDefaultTM();
+        t.tm_sec = 5;
+        RTC::alarm(&blink, t);
+        DeepSleep();
+        
+        myled4 = 0;
+// Watch dog timer wakes it up with a reset
+//
+    } else {
+// Was an initial manual or Power on Reset
+// This codes only executes the first time after initial POR or button reset
+        LPC_SC->RSID = 0x0F;
+// Clear reset source register bits for next reset
+        myled3 = 1;
+// LED3 on to indicate initial reset at full power level
+// Normal mbed power level for this setup is around 690mW
+// assuming 5V used on Vin pin
+// Power down Ethernet interface - saves around 175mW -no cable as well
+        PHY_PowerDown();
+// Power down magic USB interface chip - saves around 150mW
+// Needs new firmware (URL below) and Power need to be supplied from Vin pin not USB
+// http://mbed.org/handbook/Beta
+
+// Also exits debug mode - must not be in debug mode for deep power down modes (Board limitation)
+        result = semihost_powerdown();
+        
+// Power consumption is now around half
+// Turn off clock enables on unused I/O Peripherals (UARTs, Timers, PWM, SPI, CAN, I2C, A/D...)
+// To save just a tiny bit more power - most are already off by default in this short code example
+// See PowerControl.h for I/O device bit assignments
+// Don't turn off GPIO - it is needed to blink the LEDs
+        Peripheral_PowerDown(0xFFFF7FFF);
+// Now can do a reset to free mbed of debug mode
+// NXP manual says must exit debug mode and reset for DeepSleep or lower power levels to wakeup
+        wait(1);
+        NVIC_SystemReset();
+    }
 }
\ No newline at end of file