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1 changed files with 210 additions and 219 deletions
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@ -1,66 +1,54 @@
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#include <LPC17xx.h>
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/* PORT MAPPING:
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* KEYPAD MATRIX (4x4):
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* Columns: P0.15 - P0.18 (Output, pulled high, scan low)
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* Rows: P0.19 - P0.22 (Input, pulled high internally)
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*
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* Layout: 0 1 2 3
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* 4 5 6 7
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* 8 9 A B
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* C D E F
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*
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* 7-SEGMENT DISPLAY:
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* Segments: P0.4 - P0.11 (a-g + dp)
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* Digit Enable: P1.23 (active high)
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*
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* LCD (16x2):
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* Data: P0.23 - P0.26 (D4-D7, 4-bit mode)
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* RS: P0.27
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* EN: P0.28
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*
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* MODE BUTTON:
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* P2.12 (Input, internal pull-up)
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*
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* KEY FUNCTIONS:
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* 0-9, A-F: Digit input (valid based on current base)
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*
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* OPERATOR MODE (Hold Key 0 + another key):
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* Key 0 + B: Addition (+)
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* Key 0 + C: Clear (C)
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* Key 0 + D: Subtraction (-)
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* Key 0 + E: Multiplication (*)
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* Key 0 + F: Equals (=)
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*
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* P2.12 Button: Mode selection (cycles: DEC->BIN->OCT->HEX)
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/* ===================================================
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* SMART CALCULATOR - LPC176x
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* Supports DEC, BIN, OCT, and HEX input modes
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*, with 4x4 keypad, LCD, 7-segment, and mode button.
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* ---------------------------------------------------
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* Decimal mode: Operators B-F active directly
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* Hexadecimal mode: Operators B-F active with MODE button
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* ===================================================
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*/
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// 7-Segment patterns
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// 7-Segment patterns for 0-F
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const unsigned char seven_seg[16] = {
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0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,
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0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71
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};
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// Keypad defines
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/* ---------------- Pin Mapping ----------------
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* Keypad (4x4):
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* Columns: P0.15–P0.18 (Output)
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* Rows: P0.19–P0.22 (Input, pull-up)
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*
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* 7-Segment:
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* Segments: P0.4–P0.11
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* Digit Enable: P1.23
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*
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* LCD:
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* Data: P0.23–P0.26
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* RS: P0.27, EN: P0.28
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*
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* Mode Button: P2.12
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* ------------------------------------------------
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*/
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/* ===== MACROS ===== */
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#define COL_BASE 15
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#define ROW_BASE 19
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#define COL_MASK (0x0F << COL_BASE)
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#define ROW_MASK (0x0F << ROW_BASE)
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// 7-Segment defines
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#define SEG_SHIFT 4
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#define DIGIT_EN (1 << 23)
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// LCD defines
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#define LCD_DATA_SHIFT 23
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#define LCD_DATA_MASK (0x0F << LCD_DATA_SHIFT)
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#define LCD_RS (1 << 27)
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#define LCD_EN (1 << 28)
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// Mode button defines
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#define MODE_BUTTON (1 << 12)
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// Calculator states
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#define MODE_BIN 2
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#define MODE_OCT 8
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#define MODE_DEC 10
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@ -71,27 +59,55 @@ const unsigned char seven_seg[16] = {
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#define OP_SUB 2
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#define OP_MUL 3
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// Global variables - CHANGED to signed int
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int input_num = 0;
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int stored_num = 0;
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int result = 0;
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unsigned int current_base = MODE_DEC;
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unsigned int operation = OP_NONE;
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unsigned char lcd_flag = 0;
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/* ===== Global Variables (Predeclared) ===== */
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int input_num;
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int stored_num;
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int result;
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unsigned int current_base;
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unsigned int operation;
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unsigned char lcd_flag;
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unsigned char result_displayed;
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unsigned int key, last_key, stable;
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unsigned int button_state, last_button_state, button_stable;
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unsigned int shift_active;
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/* ===== Function Declarations ===== */
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void delay(volatile unsigned int d);
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void lcd_delay(unsigned long r);
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void lcd_write_nibble(unsigned char nibble, unsigned char is_data);
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void lcd_cmd(unsigned char cmd);
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void lcd_data(unsigned char data);
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void lcd_init(void);
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void lcd_print_str(const char *str);
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void lcd_print_num(int num, unsigned int base);
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void display_mode(void);
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void display_input(void);
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void display_operator_feedback(const char *op_symbol);
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unsigned int scan_keypad(void);
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unsigned int scan_mode_button(void);
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unsigned int is_valid_digit(unsigned int key);
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void change_mode(void);
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void operate(unsigned int op);
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void perform_operation(void);
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/* ===== Utility & LCD Handling ===== */
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void delay(volatile unsigned int d) {
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while(d--) __NOP();
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while (d--)
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__NOP();
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}
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void lcd_delay(unsigned long r) {
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unsigned long i;
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for(i=0; i<r; i++);
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for (i = 0; i < r; i++)
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;
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}
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void lcd_write_nibble(unsigned char nibble, unsigned char is_data) {
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unsigned long temp;
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temp = (nibble & 0x0F) << LCD_DATA_SHIFT;
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LPC_GPIO0->FIOPIN = (LPC_GPIO0->FIOPIN & ~LCD_DATA_MASK) | temp;
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LPC_GPIO0->FIOPIN =
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(LPC_GPIO0->FIOPIN & ~LCD_DATA_MASK) | temp;
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if (is_data)
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LPC_GPIO0->FIOSET = LCD_RS;
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@ -138,12 +154,10 @@ void lcd_print_str(const char* str){
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}
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}
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// MODIFIED to handle negative numbers
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void lcd_print_num(int num, unsigned int base) {
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char buffer[17];
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int i = 0;
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// For non-decimal bases, show as unsigned (two's complement representation)
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if (base != MODE_DEC) {
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unsigned int unum = (unsigned int)num;
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if (unum == 0) {
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@ -152,34 +166,27 @@ void lcd_print_num(int num, unsigned int base){
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}
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while (unum > 0 && i < 16) {
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unsigned int digit = unum % base;
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if(digit < 10)
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buffer[i++] = '0' + digit;
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else
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buffer[i++] = 'A' + (digit - 10);
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unum = unum / base;
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buffer[i++] = (digit < 10) ? ('0' + digit)
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: ('A' + (digit - 10));
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unum /= base;
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}
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} else {
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// Decimal mode: handle negative with minus sign
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if (num < 0) {
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lcd_data('-');
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num = -num;
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}
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if (num == 0) {
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lcd_data('0');
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return;
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}
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while (num > 0 && i < 16) {
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buffer[i++] = '0' + (num % 10);
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num = num / 10;
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num /= 10;
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}
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}
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while(i > 0){
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while (i > 0)
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lcd_data(buffer[--i]);
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}
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}
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void display_mode(void) {
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lcd_cmd(0x80);
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@ -202,15 +209,15 @@ void display_input(void){
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}
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void display_operator_feedback(const char *op_symbol) {
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// Brief feedback on line 2
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lcd_cmd(0xC0);
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lcd_print_str("Op: ");
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lcd_print_str(op_symbol);
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lcd_print_str(" ");
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delay(100000); // Brief delay to show feedback
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display_input(); // Return to showing input
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delay(100000);
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display_input();
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}
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/* ====== Keypad & Button Handling ===== */
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unsigned int scan_keypad(void) {
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unsigned int col, row;
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unsigned int row_bits;
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return 0xFF;
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}
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// Check if Key 0 is currently pressed (shift key)
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unsigned int is_key0_pressed(void){
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unsigned int col = 0; // Key 0 is at column 0, row 0
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unsigned int row_bits;
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LPC_GPIO0->FIOSET = COL_MASK;
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delay(50);
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LPC_GPIO0->FIOCLR = (1 << (COL_BASE + col));
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delay(200);
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row_bits = (LPC_GPIO0->FIOPIN & ROW_MASK) >> ROW_BASE;
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LPC_GPIO0->FIOSET = COL_MASK;
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// Check if row 0 is pressed (Key 0)
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return ((row_bits & 0x01) == 0) ? 1 : 0;
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}
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unsigned int scan_mode_button(void) {
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// Return 1 if button is pressed (active low), 0 if not pressed
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return ((LPC_GPIO2->FIOPIN & MODE_BUTTON) == 0) ? 1 : 0;
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}
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unsigned int is_valid_digit(unsigned int key) {
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if(key >= 16) return 0;
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if(current_base == MODE_BIN && key >= 2) return 0;
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if(current_base == MODE_OCT && key >= 8) return 0;
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if(current_base == MODE_DEC && key >= 10) return 0;
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// In HEX mode, all keys 0-15 are valid digits!
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return 1;
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if (key >= 16)
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return 0;
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if (current_base == MODE_BIN && key >= 2)
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return 0;
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if (current_base == MODE_OCT && key >= 8)
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return 0;
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if (current_base == MODE_DEC && key >= 10)
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return 0;
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return 1; // HEX accepts all 0-F
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}
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void change_mode(void) {
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current_base = MODE_HEX;
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else
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current_base = MODE_DEC;
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display_mode();
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}
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int main(void){
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unsigned int key, last_key = 0xFF;
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unsigned int stable = 0;
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unsigned int button_state, last_button_state = 0;
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unsigned int button_stable = 0;
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unsigned int shift_active = 0;
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// Configure pins
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LPC_PINCON->PINSEL0 = 0;
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LPC_PINCON->PINSEL1 = 0;
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LPC_PINCON->PINSEL3 = 0;
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LPC_PINCON->PINSEL4 = 0; // Configure P2.12
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// Keypad: Columns output, Rows input
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LPC_GPIO0->FIODIR |= COL_MASK;
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LPC_GPIO0->FIODIR &= ~ROW_MASK;
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LPC_GPIO0->FIOSET = COL_MASK;
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// Mode button: Input with internal pull-up
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LPC_GPIO2->FIODIR &= ~MODE_BUTTON; // Set as input
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// 7-Segment
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LPC_GPIO0->FIODIR |= (0xFF << SEG_SHIFT);
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LPC_GPIO1->FIODIR |= DIGIT_EN;
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// LCD
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LPC_GPIO0->FIODIR |= LCD_DATA_MASK | LCD_RS | LCD_EN;
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lcd_init();
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display_mode();
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display_input();
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for(;;){
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// Check if shift key (Key 0) is being held
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shift_active = is_key0_pressed();
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// Scan for other keys
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key = scan_keypad();
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button_state = scan_mode_button();
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// Debounce keypad
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if(key == last_key){
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if(stable < 5) stable++;
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} else {
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last_key = key;
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stable = 0;
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}
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// Debounce mode button
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if(button_state == last_button_state){
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if(button_stable < 5) button_stable++;
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} else {
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last_button_state = button_state;
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button_stable = 0;
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}
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// Handle mode button press
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if(button_stable == 3 && button_state == 1){
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change_mode();
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button_stable = 5; // Prevent multiple triggers
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}
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// Handle keypad input
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if(stable == 3 && key != 0xFF){
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// Key pressed and stable
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// If Key 0 is also pressed, we're in operator mode
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if(shift_active && key != 0){
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// OPERATOR MODE (Key 0 + another key)
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if(key == 11){ // Key 0 + B = Addition
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/* ===== Operator Handling ===== */
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void operate(unsigned int op) {
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stored_num = input_num;
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operation = OP_ADD;
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operation = op;
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input_num = 0;
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display_operator_feedback("+");
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result_displayed = 0;
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}
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else if(key == 12){ // Key 0 + C = Clear
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input_num = 0;
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stored_num = 0;
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operation = OP_NONE;
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result = 0;
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display_operator_feedback("CLR");
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}
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else if(key == 13){ // Key 0 + D = Subtraction
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stored_num = input_num;
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operation = OP_SUB;
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input_num = 0;
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display_operator_feedback("-");
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}
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else if(key == 14){ // Key 0 + E = Multiplication
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stored_num = input_num;
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operation = OP_MUL;
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input_num = 0;
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display_operator_feedback("*");
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}
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else if(key == 15){ // Key 0 + F = Equals
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void perform_operation(void) {
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if (operation == OP_ADD)
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result = stored_num + input_num;
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else if (operation == OP_SUB)
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@ -389,32 +296,116 @@ int main(void){
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input_num = result;
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operation = OP_NONE;
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result_displayed = 1;
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}
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/* ===== MAIN ===== */
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int main(void) {
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// Init globals
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input_num = stored_num = result = 0;
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current_base = MODE_DEC;
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operation = OP_NONE;
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lcd_flag = 0;
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result_displayed = 0;
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key = last_key = 0xFF;
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stable = button_stable = 0;
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button_state = last_button_state = 0;
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LPC_PINCON->PINSEL0 = 0;
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LPC_PINCON->PINSEL1 = 0;
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LPC_PINCON->PINSEL3 = 0;
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LPC_PINCON->PINSEL4 = 0;
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LPC_GPIO0->FIODIR |= COL_MASK;
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LPC_GPIO0->FIODIR &= ~ROW_MASK;
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LPC_GPIO0->FIOSET = COL_MASK;
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LPC_GPIO2->FIODIR &= ~MODE_BUTTON;
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LPC_GPIO0->FIODIR |= (0xFF << SEG_SHIFT);
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LPC_GPIO1->FIODIR |= DIGIT_EN;
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LPC_GPIO0->FIODIR |= LCD_DATA_MASK | LCD_RS | LCD_EN;
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lcd_init();
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display_mode();
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display_input();
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for (;;) {
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key = scan_keypad();
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button_state = scan_mode_button();
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if (key == last_key) {
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if (stable < 5)
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stable++;
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} else {
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last_key = key;
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stable = 0;
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}
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else {
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// NORMAL MODE - Digit input
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if(is_valid_digit(key)){
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if (button_state == last_button_state) {
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if (button_stable < 5)
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button_stable++;
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} else {
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last_button_state = button_state;
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button_stable = 0;
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}
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if (button_stable == 3 && button_state == 1) {
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change_mode();
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button_stable = 5;
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}
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if (stable == 3 && key != 0xFF) {
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/* =========================
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* DECIMAL MODE: Operator works directly
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* HEX MODE: Operator works with MODE_BUTTON held
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* ========================= */
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if ((current_base == MODE_DEC) ||
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(current_base == MODE_HEX && button_state == 1)) {
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if (key == 11) { // B = +
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operate(OP_ADD);
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display_operator_feedback("+");
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} else if (key == 12) { // C = CLR
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input_num = stored_num = result = 0;
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operation = OP_NONE;
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result_displayed = 0;
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display_operator_feedback("CLR");
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} else if (key == 13) { // D = -
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operate(OP_SUB);
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display_operator_feedback("-");
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} else if (key == 14) { // E = *
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operate(OP_MUL);
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display_operator_feedback("*");
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} else if (key == 15) { // F = =
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perform_operation();
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} else if (is_valid_digit(key)) {
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result_displayed = 0;
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input_num = input_num * current_base + key;
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display_input();
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}
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} else {
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if (is_valid_digit(key)) {
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result_displayed = 0;
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input_num = input_num * current_base + key;
|
||||
// Handle overflow with wrap-around for signed int
|
||||
if(input_num > 32767) input_num = input_num % 32768;
|
||||
if(input_num < -32768) input_num = -32768;
|
||||
display_input();
|
||||
}
|
||||
}
|
||||
|
||||
stable = 5; // Prevent repeated triggers
|
||||
stable = 5;
|
||||
}
|
||||
|
||||
// Display result on 7-segment (last digit only)
|
||||
// MODIFIED: Use decimal point to indicate negative numbers
|
||||
int display_value = (input_num < 0) ? -input_num : input_num;
|
||||
unsigned int display_digit = display_value % 16;
|
||||
unsigned int seg_pattern = seven_seg[display_digit];
|
||||
// ===== STATE DISPLAY on 7-Segment =====
|
||||
unsigned int seg_pattern;
|
||||
|
||||
// Turn on decimal point if number is negative
|
||||
if(input_num < 0){
|
||||
seg_pattern |= 0x80; // Bit 7 is the decimal point
|
||||
}
|
||||
if (operation == OP_NONE && result_displayed == 0)
|
||||
seg_pattern = 0x06; // '1'
|
||||
else if (operation != OP_NONE)
|
||||
seg_pattern = 0x5B | 0x80; // '2' + DP
|
||||
else if (result_displayed == 1)
|
||||
seg_pattern = 0x4F | 0x80; // '3' + DP
|
||||
else
|
||||
seg_pattern = 0x3F; // '0'
|
||||
|
||||
LPC_GPIO0->FIOCLR = (0xFF << SEG_SHIFT);
|
||||
LPC_GPIO0->FIOSET = (seg_pattern << SEG_SHIFT);
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue