This c code is given how would i change it so that it loops the SOS signal in a

Question

This c code is given how would i change it so that it loops the SOS signal in a red color on the LED. (SOS is three short light bursts followed by three long and then three short then a pause) this is on Keil using the simulator on port f

#include <stdint.h>
#include "../inc/tm4c123gh6pm.h"

unsigned long In; // input from PF4
unsigned long Out; // output to PF2 (blue LED)
// Function Prototypes
void PortF_Init(void);
// 3. Subroutines Section
// MAIN: Mandatory for a C Program to be executable
int main(void){ // initialize PF0 and PF4 and make them inputs
PortF_Init(); // make PF3-1 out (PF3-1 built-in LEDs)
while(1){
In = GPIO_PORTF_DATA_R&0x10; // read PF4 into Sw1
In = In>>2; // shift into position PF2
Out = GPIO_PORTF_DATA_R;
Out = Out&0xFB;
Out = Out|In;
GPIO_PORTF_DATA_R = Out; // output
}
}
// Subroutine to initialize port F pins for input and output
// PF4 is input SW1 and PF2 is output Blue LED
// Inputs: None
// Outputs: None
// Notes: ...
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
}

Explanation / Answer

for 3 shortest light :- use the for loop with the int variable because the range of int is not big and put the condition like

int a=213;

int b=0;

while(b<=2)//while loop execute 3 times because you want to show 3 shortest light

{for(a=0;a<=213;a++)

//your code to display lights

}

b++;

}

2)for 3 longest light use the float variable because the range of float is maximum.

float a=21342314531;

int b=0;

while(b<=2)//while loop will execute 3 times

{for(a=0;a<=21342314531;a++)

{

//your code to display light

}

b++;

}

3)for again 3 shortest light again use the int variable because of minumum range

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