topic Re: Problem with GPIO readning and writing ? in Kinetis Microcontrollers

Problem with GPIO readning and writing ?

karthikpoojary — Sat, 12 Nov 2016 08:41:09 GMT

I am setting few portlines GPIO mux and enabling internal pulldown. I want this GPIO lines to remain low till externally pulled high.But when GPIO lines pulled high externally and try to read the values the process goes to hardset faults.

My MCU is k64

PORTC->PCR[8] = 0x102;
PORTC->PCR[9] = 0x102;
PORTC->PCR[10] = 0x102;
PORTC->PCR[11] = 0x102;
PORTC->PCR[12] = 0x102;
PORTC->PCR[13] = 0x102;

This are the commands I am using to enable internal pulldowns and set it as GPIOs.

Re: Problem with GPIO readning and writing ?

mjbcswitzerland — Sat, 12 Nov 2016 20:02:41 GMT

It sounds as though you have forgotten to enable the clock to the port in SIM_SCGC5 (bit 0x00000800 for PORT C).

Regards

Mark

Re: Problem with GPIO readning and writing ?

karthikpoojary — Mon, 14 Nov 2016 09:01:15 GMT

I have enabled the clock but still the hardset fault is occuring

Re: Problem with GPIO readning and writing ?

mjbcswitzerland — Mon, 14 Nov 2016 09:42:15 GMT

I think that you need to show the complete code in order for the cause to be visible if you are sure that clocks are enabled.

Regards

Mark

Kinetis for professionals: http://www.utasker.com/kinetis.html
K64 for professionals: http://www.utasker.com/kinetis/FRDM-K64F.html / http://www.utasker.com/kinetis/TWR-K64F120M.html