Optimizing power consumption

[Tjoms99]

Summary

Addressing the issue of current draw by certain GPIOs when enabled, with a focus on optimizing power consumption.

Affected GPIOs

These three GPIOs are drawing current when enabled:

#define GPIO_BATTERY_CHARGE_SPEED 13
#define GPIO_BATTERY_CHARGING_ENABLE 17
#define GPIO_BATTERY_READ_ENABLE 14

Proposed Solution

When not in use, two of these GPIOs can be disabled to save power:

• GPIO_BATTERY_CHARGE_SPEED
• GPIO_BATTERY_READ_ENABLE

Details

• GPIO_BATTERY_CHARGE_SPEED :

  • Should be disabled when the charger is not connected.

• GPIO_BATTERY_CHARGING_ENABLE:

  • If disabled, the battery driver will not be able to detect when a charger is connected or disconnected.
  • Consequently, it will not be able to reconnect GPIO_BATTERY_CHARGE_SPEED automatically, and this would have to be done manually which is something we dont want.

• GPIO_BATTERY_READ_ENABLE:

  • Should be enabled just before a voltage sample is taken.
  • Should be disabled immediately after the sampling is done.