From c394652d008662c9f0a4bc579186cdc617e3ba4f Mon Sep 17 00:00:00 2001
From: Sanyog Ramesh Nevase <ee24mt028@iitdh.ac.in>
Date: Sun, 22 Sep 2024 20:56:04 +0530
Subject: [PATCH] Add switch press logic

Add GPIO PortF Handler
Add Button Press measurement
---
 Group21_Lab06_Task2/main.c | 51 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 49 insertions(+), 2 deletions(-)

diff --git a/Group21_Lab06_Task2/main.c b/Group21_Lab06_Task2/main.c
index 0d8d1b0..11d47b0 100644
--- a/Group21_Lab06_Task2/main.c
+++ b/Group21_Lab06_Task2/main.c
@@ -1,11 +1,13 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "tm4c123gh6pm.h"
+
+
 // Global Variables
 volatile int duty = 50; // Initial duty cycle
 volatile bool buttonPressed = false; // Track button state
 volatile uint32_t pressDuration = 0; // Track how long the button is pressed
-const long int PWM_PERIOD = 1000000; // Period for 100kHz in microseconds (10ms)
+const long int PWM_PERIOD = 1000; // Period for 100kHz in microseconds (10ms)
 #define STCTRL *((volatile uint32_t *) 0xE000E010) // Control and status
 #define STRELOAD *((volatile uint32_t *) 0xE000E014) // Reload value
 #define STCURRENT *((volatile uint32_t *) 0xE000E018) // Current value
@@ -61,4 +63,49 @@ void SystickHandler(void)
     {
         ontime = 0;                 // Reset counter after one period
     }
-}
\ No newline at end of file
+// Handle button press duration measurement
+    if (buttonPressed) {
+        pressDuration++;
+    }
+
+} 
+
+void GPIOF_interruptHandler(void) {
+    // Check if PF0 (SW1) is pressed (interrupt)
+    //long int i = 0;
+    //for (i=0; i < 100000 ; i++){ }
+    if (!(GPIO_PORTF_DATA_R & 0x01))
+    {
+        if (!buttonPressed) { // If button was not already pressed
+            buttonPressed = true;
+            pressDuration = 0; // Reset press duration
+        }
+    } else { // Button released
+        if (buttonPressed) { // Only if button was previously pressed
+            buttonPressed = false;
+
+            // Determine press duration
+            if (pressDuration > 100) {  // Long press (>1 sec if using 10 ms ticks)
+                    duty -= 5;  // Decrease duty cycle
+                                    if (duty < 0)
+                                        {duty = 0;
+                                        // Ensure duty cycle doesn't gor below 0%
+
+                    }
+            } else if (pressDuration < 100){  // Short press
+                duty += 5;  // decrease duty cycle
+                               if (duty > 100)
+                                   {duty = 100;
+                                   // Ensure duty cycle doesn't exceed 100%
+                    }
+            }
+        }
+
+        // Clear the interrupt flag for PF0 (Switch 1)
+        GPIO_PORTF_ICR_R = 0x01;  // Clear interrupt flag
+    }
+}
+
+
+
+