EK-TM4C123GXL: Defective Boards.

Poster's "pain" is (somewhat) felt - yet not (fully) undeserved!     Let's all hope that,  "All FIVE LPads CAN be RECOVERED!"

Having, "FIVE out of FIVE" LPads - "DOA" (Dead On Arrival) is statistically  (Off the Charts - UNLIKELY!)     Thus (some) attention must turn to, (pardon) "Poster's Handling and/or Programming."

And Voila - "Crime Scene, Murder Weapon,  and Trace Blood Evidence" - all, "Jump Out" - landing at the feet of  (Homicide Detective) Crüe!

First - presented here - the "Bloody Crime Scene:" 

void PortC_Init(void){ 

volatile unsigned long delay;
SYSCTL_RCGC2_R |= 0x04; // 1) activate Port C
delay = SYSCTL_RCGC2_R; // allow time for clock to stabilize
GPIO_PORTC_LOCK_R = 0x4C4F434B; // 2) To unlock GPIO Port D,C nd F write this value 0x4C4F434B; // 2) no need to unlock PB7-0
GPIO_PORTC_CR_R |= 0xF0; // allow changes to PC4-7 The others are used JTAG on the board
GPIO_PORTC_AMSEL_R =0x00; 
GPIO_PORTC_PCTL_R =0x00; 
GPIO_PORTC_AFSEL_R =0x00; 
GPIO_PORTC_DIR_R |= 0xF0; //Output PC4-PC7
GPIO_PORTC_DEN_R |= 0xF0; 
}

And now - the  "Murder Weapon:"

GPIO_PORTC_PCTL_R   = 0x00;         Note the "bloody knife" (the "=" (assignment)) used in place of the SAFER "|="
GPIO_PORTC_AFSEL_R = 0x00;

And lastly - the "Trace Evidence:"        Note that (both) "GPIOPCTL and GPIOAFSEL" have been CLEARED by Poster!     Chart (evidence) below reveals both Registers - w/regard to PC0-PC3 - must be "1".

Might this be yet ANOTHER CASE - where the "extraordinary  EFFORTS" demanded by "DRM" ...  have "DONE IN" (another) poster?       ("GPIODEN" is "unknown" - as its "update" was "safe.")