TM4C1294KCPDT: Tiva C series

Yuvaraj V

Prodigy 100 points

Part Number: TM4C1294KCPDT
Other Parts Discussed in Thread: EK-TM4C1294XL

HI,

I want to use Port D and E normal GPIO function, normally this port pins are allocated to special functions.

How to unlock this and use as a normal Input pins.?

Example code i expecting

Regards,

Yuvaraj

over 1 year ago

+1 Charles Tsai over 1 year ago

TI__Guru**** 191296 points

Hi,

Please refer to this FAQ to unlock the special pins for GPIO.

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1020815/faq-how-to-get-locked-gpio-pins-on-tm4c129-devices-to-work

You can also refer to the example at C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl\gpio_jtag. There is below snippet of code to change PC[3:0] into GPIO inputs.

//
// Change PC0-3 into GPIO inputs.
//
HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x01;
HWREG(GPIO_PORTC_BASE + GPIO_O_AFSEL) &= 0xfe;
HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x02;
HWREG(GPIO_PORTC_BASE + GPIO_O_AFSEL) &= 0xfd;
HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x04;
HWREG(GPIO_PORTC_BASE + GPIO_O_AFSEL) &= 0xfb;
HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x08;
HWREG(GPIO_PORTC_BASE + GPIO_O_AFSEL) &= 0xf7;
HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = GPIO_LOCK_KEY;
HWREG(GPIO_PORTC_BASE + GPIO_O_CR) = 0x00;
HWREG(GPIO_PORTC_BASE + GPIO_O_LOCK) = 0;
MAP_GPIOPinTypeGPIOInput(GPIO_PORTC_BASE, (GPIO_PIN_0 | GPIO_PIN_1 |
GPIO_PIN_2 |
GPIO_PIN_3));

0 Yuvaraj V over 1 year ago in reply to Charles Tsai

Prodigy 100 points

Thank you it's working

Arm-based microcontrollers

Arm-based microcontrollers forum

TM4C1294KCPDT: Tiva C series