Power management

From OpenTom

Jump to: navigation, search

the hardware supports power management.

There is a GPIO pin used to switch on/off the device.


the code also talks about an 'ignote' -- if you take into account that there is also 

B08 	 IGNITION 	 INP 	 Pull-Down resistor within TTGO 	 Ignition sense ..

I would assume that this pin is used to maybe switch on display et all.


see source code trunk: ..../drivers/Barcelona/Power/


You can read the battery status with this program : 

 int batfd;
 batfd = open("/dev/battery", O_RDWR);
 BATTERY_STATUS status;
 ioctl (batfd, IOR_BATTERY_STATUS, &status);
 printf ("Battery Voltage = %d\n", status.u16BatteryVoltage);           // battery voltage
 printf ("Reference Voltage = %d\n",status.u16ReferenceVoltage);        // reference voltage
 printf ("Charge Current = %d\n",status.u16ChargeCurrent);              // Charge current
 close(batfd);

And then you get, for example : 

 Battery Voltage = 650
 Reference Voltage = 383
 Charge Current = 33

But what are the units ?

Retrieved from "http://opentom.org/Power_management"
Personal tools