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1 changed files with 89 additions and 76 deletions
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@ -2,36 +2,22 @@
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/* ===================================================
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* SMART CALCULATOR - LPC176x
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* Supports BIN, BASE4, OCT, DEC, and HEX modes with
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* 4x4 keypad, LCD, and 7-segment display.
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* ---------------------------------------------------
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* DEC/BIN/BASE4/OCT : Operators B–F work directly
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* HEX : Operators B–F require MODE pressed
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* Supports BIN, BASE4, OCT, DEC, and HEX
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* with 4x4 keypad, LCD, and 7-seg status.
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*
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* BIN/BASE4/OCT/DEC: operators B–F direct
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* HEX: operators B–F only when MODE button held
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* Arithmetic is performed modulo the current base
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* ===================================================
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*/
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// 7-Segment patterns for 0–F
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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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/* ===== Pin Mapping =====
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* Keypad (4x4):
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* Columns: P0.15–P0.18 (Outputs)
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* Rows: P0.19–P0.22 (Inputs, pull-ups)
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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, RS: P0.27, EN: P0.28
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*
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* Mode Button: P2.12 (active low)
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*/
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/* ===== MACROS ===== */
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/* ===== Pin & Mode Definitions ===== */
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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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@ -47,20 +33,21 @@ const unsigned char seven_seg[16] = {
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#define MODE_BUTTON (1 << 12)
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/* Supported Bases */
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#define MODE_BIN 2
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#define MODE_BASE4 4
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#define MODE_OCT 8
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#define MODE_DEC 10
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#define MODE_HEX 16
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/* Operators */
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#define OP_NONE 0
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#define OP_ADD 1
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#define OP_SUB 2
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#define OP_MUL 3
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/* ===== Global Variables (Predeclared) ===== */
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/* ===== Global Variables (predeclared) ===== */
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int input_num;
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unsigned int seg_pattern;
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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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@ -71,7 +58,7 @@ 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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/* ===== Function Declarations ===== */
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/* ===== Function Prototypes ===== */
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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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@ -89,8 +76,9 @@ 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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unsigned char is_operator_active(unsigned int key, unsigned int mode_button);
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/* ===== Delays ===== */
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/* ====== Utility ====== */
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void delay(volatile unsigned int d) {
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while (d--)
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__NOP();
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@ -102,7 +90,7 @@ void lcd_delay(unsigned long r) {
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;
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}
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/* ===== LCD ===== */
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/* ===== LCD ==== */
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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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@ -149,11 +137,11 @@ void lcd_init(void) {
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}
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void lcd_print_str(const char *str) {
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while (*str) {
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while (*str)
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lcd_data(*str++);
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}
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}
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/* ===== Print number in base ===== */
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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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@ -184,11 +172,12 @@ void lcd_print_num(int num, unsigned int base) {
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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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lcd_data(buffer[--i]);
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}
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/* ===== Display Handling ===== */
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/* ===== Display handlers ===== */
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void display_mode(void) {
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lcd_cmd(0x80);
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lcd_print_str("Mode: ");
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@ -206,7 +195,18 @@ void display_mode(void) {
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void display_input(void) {
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lcd_cmd(0xC0);
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lcd_print_str("Inp: ");
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lcd_print_str("Inp(");
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if (current_base == MODE_BIN)
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lcd_print_str("2");
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else if (current_base == MODE_BASE4)
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lcd_print_str("4");
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else if (current_base == MODE_OCT)
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lcd_print_str("8");
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else if (current_base == MODE_DEC)
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lcd_print_str("10");
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else
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lcd_print_str("16");
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lcd_print_str("): ");
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lcd_print_num(input_num, current_base);
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lcd_print_str(" ");
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}
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@ -220,7 +220,7 @@ void display_operator_feedback(const char *op_symbol) {
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display_input();
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}
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/* ===== Input Handling ===== */
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/* ====== Scan Keypad ====== */
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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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@ -236,7 +236,7 @@ unsigned int scan_keypad(void) {
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for (row = 0; row < 4; row++) {
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if ((row_bits & (1 << row)) == 0) {
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LPC_GPIO0->FIOSET = COL_MASK;
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return col * 4 + row;
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return (col * 4 + row);
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}
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}
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}
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@ -245,11 +245,12 @@ unsigned int scan_keypad(void) {
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return 0xFF;
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}
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/* ===== Mode button ===== */
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unsigned int scan_mode_button(void) {
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return ((LPC_GPIO2->FIOPIN & MODE_BUTTON) == 0) ? 1 : 0;
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}
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/* ===== Mode Switching ===== */
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/* ===== Modes and Validation ===== */
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void change_mode(void) {
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if (current_base == MODE_DEC)
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current_base = MODE_BIN;
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@ -261,6 +262,7 @@ 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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@ -275,10 +277,10 @@ unsigned int is_valid_digit(unsigned int key) {
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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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return 1;
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}
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/* ===== Operations ===== */
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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;
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@ -286,6 +288,7 @@ void operate(unsigned int op) {
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result_displayed = 0;
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}
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/* perform_operation: arithmetic within the active base */
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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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@ -296,8 +299,27 @@ void perform_operation(void) {
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else
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result = input_num;
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/* Base-aware modular arithmetic for non-DEC modes */
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if (current_base != MODE_DEC) {
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if (result < 0)
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result = (result % current_base + current_base) % current_base;
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else
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result %= current_base;
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}
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lcd_cmd(0xC0);
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lcd_print_str("Res: ");
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lcd_print_str("Res(");
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if (current_base == MODE_BIN)
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lcd_print_str("2");
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else if (current_base == MODE_BASE4)
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lcd_print_str("4");
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else if (current_base == MODE_OCT)
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lcd_print_str("8");
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else if (current_base == MODE_DEC)
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lcd_print_str("10");
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else
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lcd_print_str("16");
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lcd_print_str("): ");
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lcd_print_num(result, current_base);
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lcd_print_str(" ");
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@ -306,9 +328,15 @@ void perform_operation(void) {
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result_displayed = 1;
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}
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unsigned char is_operator_active(unsigned int key, unsigned int mode_button) {
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if (current_base == MODE_HEX)
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return (mode_button && key >= 11 && key <= 15);
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else
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return (key >= 11 && key <= 15);
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}
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/* ===== MAIN ===== */
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int main(void) {
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// Initialize 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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stable = button_stable = 0;
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button_state = last_button_state = 0;
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// Configure Pins
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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;
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// Keypad setup
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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 setup
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LPC_GPIO2->FIODIR &= ~MODE_BUTTON;
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// 7-Segment setup
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LPC_GPIO0->FIODIR |= (0xFF << SEG_SHIFT);
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LPC_GPIO1->FIODIR |= DIGIT_EN;
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// LCD setup
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LPC_GPIO0->FIODIR |= LCD_DATA_MASK | LCD_RS | LCD_EN;
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lcd_init();
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@ -347,7 +371,7 @@ int main(void) {
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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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/* Debounce keypad */
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if (key == last_key) {
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if (stable < 5)
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stable++;
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@ -356,7 +380,7 @@ int main(void) {
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stable = 0;
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}
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// Debounce mode button
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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)
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button_stable++;
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button_stable = 0;
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}
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// Cycle through modes
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/* Handle mode change */
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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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// Handle keypad press
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/* Handle key event */
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if (stable == 3 && key != 0xFF) {
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unsigned char allow_operator = 0;
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unsigned char op_allowed = is_operator_active(key, button_state);
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// Operators allowed directly for all modes except HEX (must hold mode)
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if (current_base == MODE_HEX && button_state == 1)
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allow_operator = 1;
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else if (current_base != MODE_HEX)
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allow_operator = 1;
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// Operator Keys: B–F (indices 11–15)
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if (allow_operator) {
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if (key == 11) { // B = +
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if (op_allowed) {
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if (key == 11) {
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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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} else if (key == 12) {
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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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} else if (key == 13) {
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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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} else if (key == 14) {
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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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} else if (key == 15) {
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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;
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display_input();
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}
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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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stable = 5;
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}
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// ===== STATE DISPLAY on 7-Segment =====
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/* Update 7-seg state display */
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unsigned int seg_pattern;
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if (operation == OP_NONE && result_displayed == 0)
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seg_pattern = 0x06; // '1' - Input mode
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seg_pattern = 0x06; // '1'
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else if (operation != OP_NONE)
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seg_pattern = 0x5B | 0x80; // '2' + DP - Waiting for 2nd operand
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seg_pattern = 0x5B | 0x80; // '2' + dp
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else if (result_displayed == 1)
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seg_pattern = 0x4F | 0x80; // '3' + DP - Result shown
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seg_pattern = 0x4F | 0x80; // '3' + dp
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else
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seg_pattern = 0x3F; // '0' - Reset
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seg_pattern = 0x3F; // '0'
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LPC_GPIO0->FIOCLR = (0xFF << SEG_SHIFT);
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LPC_GPIO0->FIOSET = (seg_pattern << SEG_SHIFT);
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