printf()

Thanks Lori.

Another question, I am trying to read a GPIO input value. I am using a pull down resistor circuit with a push button switch. But the input reads 1 no matter what the button position is. I am using this syntax. 

value = GpioDataRegs.GPADAT.bit.GPIO30;

I am expecting to read it 0 initially, and 1 when i push the button down. I did not include a debounce loop yet. 

Any help is appreciated. 

Sandhya rani Jetti said:

Thanks Lori.

Another question, I am trying to read a GPIO input value. I am using a pull down resistor circuit with a push button switch. But the input reads 1 no matter what the button position is. I am using this syntax. 

value = GpioDataRegs.GPADAT.bit.GPIO30;

I am expecting to read it 0 initially, and 1 when i push the button down. I did not include a debounce loop yet. 

Any help is appreciated. 

Hi Sandhya,

I would suggest disabling the internal pull-up on the pin to see if this makes a difference.     i.e. GpioCtrlRegs.GPAPUD.bit.GPIO30 = 1;

-Lori

I disconnected my additional circuit and just reading the GPIO30 value, I disable the internal pull resistor as you mentioned, it still reads 1. 

Sandhya rani Jetti said:

I disconnected my additional circuit and just reading the GPIO30 value, I disable the internal pull resistor as you mentioned, it still reads 1. 

Things I would do to try and debug:

• Double check that you are on the right pin. 
• Do you see any other pins within the data register (or another data register) go low? 
• Are you pulling the pin to ground? 
• Try monitoring the data register in the watch window or the register view 

Lori