I am trying to read the status of PF0. I wrote two configurations for PF0, the first one :
GPIOF->DIR &=~(1<<0); //Make PF0 INPUT
GPIOF->DEN |= 0XFF; //ENABLE DIGITAL FUNCTION ON PORT F
GPIOF->PUR &= 0X00; //DISABLE PULL UP RESISTOR ON PORT F
As it appears in the memory map the DATA register for PF. The PF0 is reading zero, which is an unexpected value for two reasons. The first reason is I didn't unlock the PORT, the second reason is I am reading 2.97 v, using the multimeter.
My second configuration:
GPIOF->LOCK = 0X4C4F434B; //Unlock PORT F
GPIOF->CR |= 0XFF; //Enable writing to DIR, DEN and PUR register
GPIOF->DIR &=~(1<<0); //Make PF0 INPUT
GPIOF->DEN |= 0XFF; //ENABLE DIGITAL FUNCTION ON PORT F
GPIOF->PUR &= 0X00; //DISABLE PULL UP RESISTOR ON PORT F
The read value in this case is one. which is again an unexpected value. Since I did unlock the port and disabled the pull up resistor, and the value is still 1. When I measured the voltage it's still 2.97 v, and I don't know why this voltage is not even enough to power up a LED.
Any explanation to what is going on ?
