Posted on April 27, 2018 at 04:31Hi,
Would anyone have advice about minimizing power consumption in an input port that generates an interrupt.
I have a STM32L072 micro with reset switch on Port PB_8 to GND
I am configuring it with
GpioInit( &Switch, SWITCH_PORT, PIN_INPUT, PIN_PUSH_PULL, GPIO_PULLUP, 1 );
GpioSetInterrupt( &Switch, IRQ_FALLING_EDGE, IRQ_VERY_LOW_PRIORITY, &Switch_IRQ );
to wake the micro when it is in low power sleep mode
It appears that pull up does not work with the port after it is set as an interrupt so I have had to put a pull up resistor on the port which I have changed from 10K to 100K without any change.
If the port is configured as an interrupt as above, in sleep mode it draws 300uA more than if I set to same port still with the resistor and switch attached using
GPIO_InitStruct.Pin = GPIO_PIN_8;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = 0;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
Any advice on a port configuration that reduces the current would be appreciated
Thank You
Regards
