// main.c
// Runs on LM4F120 or TM4C123
// C2_Toggle_PF1, toggles PF1 (red LED) at 5 Hz
// Daniel Valvano, Jonathan Valvano, and Ramesh Yerraballi
// July 21, 2013

// LaunchPad built-in hardware
// SW1 left switch is negative logic PF4 on the Launchpad
// SW2 right switch is negative logic PF0 on the Launchpad
// red LED connected to PF1 on the Launchpad
// blue LED connected to PF2 on the Launchpad
// green LED connected to PF3 on the Launchpad


#define GPIO_PORTF_DATA_R (*((volatile unsigned long *)0x400253FC))
#define GPIO_PORTF_DIR_R (*((volatile unsigned long *)0x40025400))
#define GPIO_PORTF_AFSEL_R (*((volatile unsigned long *)0x40025420))
#define GPIO_PORTF_PUR_R (*((volatile unsigned long *)0x40025510))
#define GPIO_PORTF_DEN_R (*((volatile unsigned long *)0x4002551C))
#define GPIO_PORTF_LOCK_R (*((volatile unsigned long *)0x40025520))
#define GPIO_PORTF_CR_R (*((volatile unsigned long *)0x40025524))
#define GPIO_PORTF_AMSEL_R (*((volatile unsigned long *)0x40025528))
#define GPIO_PORTF_PCTL_R (*((volatile unsigned long *)0x4002552C))
#define PF4 (*((volatile unsigned long *)0x40025040))
#define PF3 (*((volatile unsigned long *)0x40025020))
#define PF2 (*((volatile unsigned long *)0x40025010))
#define PF1 (*((volatile unsigned long *)0x40025008))
#define PF0 (*((volatile unsigned long *)0x40025004))
#define GPIO_PORTF_DR2R_R (*((volatile unsigned long *)0x40025500))
#define GPIO_PORTF_DR4R_R (*((volatile unsigned long *)0x40025504))
#define GPIO_PORTF_DR8R_R (*((volatile unsigned long *)0x40025508))
#define GPIO_LOCK_KEY 0x4C4F434B // Unlocks the GPIO_CR register
#define SYSCTL_RCGC2_R (*((volatile unsigned long *)0x400FE108))

void PortF_Init(void){ volatile unsigned long delay;
SYSCTL_RCGC2_R |= 0x00000020; // 1) activate clock for Port F
delay = SYSCTL_RCGC2_R; // allow time for clock to start
GPIO_PORTF_LOCK_R = 0x4C4F434B; // 2) unlock GPIO Port F
GPIO_PORTF_CR_R = 0x1F; // allow changes to PF4-0
// only PF0 needs to be unlocked, other bits can't be locked
GPIO_PORTF_AMSEL_R = 0x00; // 3) disable analog on PF
GPIO_PORTF_PCTL_R = 0x00000000; // 4) PCTL GPIO on PF4-0
GPIO_PORTF_DIR_R = 0x0E; // 5) PF4,PF0 in, PF3-1 out
GPIO_PORTF_AFSEL_R = 0x00; // 6) disable alt funct on PF7-0
GPIO_PORTF_PUR_R = 0x11; // enable pull-up on PF0 and PF4
GPIO_PORTF_DEN_R = 0x1F; // 7) enable digital I/O on PF4-0
}
unsigned long Led;
void Delay(void){unsigned long volatile time;
time = 145448; // 0.1sec
while(time){
time--;
}
}
int main(void){
PortF_Init(); // make PF1 out (PF1 built-in LED)
while(1){
Led = GPIO_PORTF_DATA_R; // read previous
Led = Led^0x02; // toggle red LED, PF1
GPIO_PORTF_DATA_R = Led; // output
Delay();
}
}









// Color LED(s) PortF
// dark --- 0
// red R-- 0x02
// blue --B 0x04
// green -G- 0x08
// yellow RG- 0x0A
// sky blue -GB 0x0C
// white RGB 0x0E
// pink R-B 0x06