From 02f4427705e36d532289587a1db7def0f8061fd9 Mon Sep 17 00:00:00 2001
From: aadit <aadit@noreply.localhost>
Date: Thu, 23 Oct 2025 12:30:39 +0530
Subject: [PATCH] Update ES/Lab/Lab11/PWM.c

---
 ES/Lab/Lab11/PWM.c | 160 +++++++++++++++++++++++++++++++--------------
 1 file changed, 110 insertions(+), 50 deletions(-)

diff --git a/ES/Lab/Lab11/PWM.c b/ES/Lab/Lab11/PWM.c
index e1e2325..b4a8b1e 100644
--- a/ES/Lab/Lab11/PWM.c
+++ b/ES/Lab/Lab11/PWM.c
@@ -1,57 +1,117 @@
-#include "LPC17xx.h"
+#include <LPC17xx.h>
+#include <stdio.h>
 
-unsigned long int duty_cycle = 0;
-int direction = 1;
-int step = 50;
+#define RS_CTRL 0x08000000
+#define EN_CTRL 0x10000000
+#define DT_CTRL 0x07800000
 
-void PWM1_IRQHandler(void)
-{
-    if (LPC_PWM1->IR & (1 << 0))
-    {
-        if (direction == 1)
-        {
-            duty_cycle += step;
-            if (duty_cycle >= 3000)
-            {
-                duty_cycle = 3000;
-                direction = 0;
-            }
-        }
-        else
-        {
-            duty_cycle -= step;
-            if (duty_cycle <= 0)
-            {
-                duty_cycle = 0;
-                direction = 1;
-            }
-        }
+unsigned long result, y,m;
+unsigned long int temp1 = 0, temp2 = 0, i;
+unsigned char flag1 = 0, flag2 = 0;
+unsigned char msg[20];
 
-        LPC_PWM1->MR4 = duty_cycle;
-        LPC_PWM1->LER = (1 << 4);
-        LPC_PWM1->IR = (1 << 0);
+void lcd_write(void);
+void port_write(void);
+void delay_lcd(unsigned long);
+void lcd_init(void);
+void lcd_print(unsigned char *);
+void lcd_clear(void);
+void ADC_IRQHandler(void);
+void ADC_init(void);
+
+int main(void) {
+    LPC_GPIO0->FIODIR = DT_CTRL | RS_CTRL | EN_CTRL; // LCD pins as output
+
+    lcd_init();  // Initialize LCD
+    lcd_print((unsigned char *)"ADC Val:"); // Idle message
+
+    ADC_init();  // Initialize ADC
+
+    while (1) {
+        // idle loop
     }
 }
 
-int main(void)
-{
-    LPC_PINCON->PINSEL3 |= (2 << 14);
-
-    LPC_PWM1->TCR = (1 << 1);
-    LPC_PWM1->CTCR = 0;
-    LPC_PWM1->PR = 0;
-
-    LPC_PWM1->MR0 = 3000;
-    LPC_PWM1->MR4 = duty_cycle;
-
-    LPC_PWM1->MCR = (1 << 1) | (1 << 0);
-    LPC_PWM1->PCR = (1 << 12);
-
-    LPC_PWM1->LER = (1 << 0) | (1 << 4);
-
-    NVIC_EnableIRQ(PWM1_IRQn);
-
-    LPC_PWM1->TCR = (1 << 0) | (1 << 3);
-
-    while (1);
+void ADC_init(void) {
+    LPC_PINCON->PINSEL3 = 3 << 28;  // P1.30 as AD0.4
+    LPC_SC->PCONP |= 1 << 12;        // Power to ADC
+    LPC_ADC->ADCR = (1 << 4) | (1 << 21) | (1 << 16); // select AD0.4, burst mode, enable
+    LPC_ADC->ADINTEN = (1 << 4);    // Enable interrupt for AD0.4
+    NVIC_EnableIRQ(ADC_IRQn);
+}
+
+void ADC_IRQHandler(void) {
+    result = (LPC_ADC->ADGDR >> 4) & 0xFFF; // 12-bit ADC result
+
+    lcd_clear();
+    lcd_print((unsigned char *)"ADC Val:");
+    sprintf((char *)msg, " %lu", result);
+    lcd_print(msg);
+
+    y = (LPC_ADC->ADDR4 >> 4) & 0xFFF; // clear done flag
+	
+		for(m=0;m<1000000;m++);
+}
+
+void lcd_init(void) {
+    unsigned long int init_command[] =
+        {0x30, 0x30, 0x30, 0x20, 0x28, 0x0C, 0x01, 0x80};
+
+    flag1 = 0;
+    for (i = 0; i < 8; i++) {
+        temp1 = init_command[i];
+        lcd_write();
+    }
+    flag1 = 1;
+    delay_lcd(5000);
+}
+
+void lcd_print(unsigned char *text) {
+    unsigned int j = 0;
+    while (text[j] != '\0') {
+        temp1 = text[j];
+        lcd_write();
+        j++;
+    }
+}
+
+void lcd_clear(void) {
+    flag1 = 0;
+    temp1 = 0x01; // clear command
+    lcd_write();
+    delay_lcd(5000);
+    flag1 = 1;
+}
+
+void lcd_write(void) {
+    flag2 = (flag1 == 1) ? 0 : (((temp1 == 0x30) || (temp1 == 0x20)) ? 1 : 0);
+
+    temp2 = temp1 & 0xF0;
+    temp2 = temp2 << 19;
+    port_write();
+
+    if (!flag2) {
+        temp2 = temp1 & 0x0F;
+        temp2 = temp2 << 23;
+        port_write();
+    }
+}
+
+void port_write(void) {
+    LPC_GPIO0->FIOPIN = temp2;
+
+    if (flag1 == 0)
+        LPC_GPIO0->FIOCLR = RS_CTRL;
+    else
+        LPC_GPIO0->FIOSET = RS_CTRL;
+
+    LPC_GPIO0->FIOSET = EN_CTRL;
+    delay_lcd(100);
+    LPC_GPIO0->FIOCLR = EN_CTRL;
+    delay_lcd(50000);
+}
+
+void delay_lcd(unsigned long r1) {
+    unsigned long r;
+    for (r = 0; r < r1; r++);
 }