416 lines
11 KiB
C
416 lines
11 KiB
C
#include <LPC17xx.h>
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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 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 (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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#define SEG_SHIFT 4
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#define DIGIT_EN (1 << 23)
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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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#define MODE_BUTTON (1 << 12)
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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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#define MODE_HEX 16
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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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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--)
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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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;
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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 =
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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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else
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LPC_GPIO0->FIOCLR = LCD_RS;
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LPC_GPIO0->FIOSET = LCD_EN;
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lcd_delay(100);
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LPC_GPIO0->FIOCLR = LCD_EN;
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lcd_delay(500000);
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}
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void lcd_cmd(unsigned char cmd) {
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lcd_write_nibble(cmd >> 4, 0);
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lcd_write_nibble(cmd, 0);
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}
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void lcd_data(unsigned char data) {
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lcd_write_nibble(data >> 4, 1);
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lcd_write_nibble(data, 1);
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}
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void lcd_init(void) {
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lcd_delay(5000000);
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lcd_write_nibble(0x03, 0);
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lcd_delay(500000);
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lcd_write_nibble(0x03, 0);
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lcd_delay(500000);
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lcd_write_nibble(0x03, 0);
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lcd_delay(500000);
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lcd_write_nibble(0x02, 0);
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lcd_delay(500000);
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lcd_cmd(0x28);
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lcd_cmd(0x0C);
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lcd_cmd(0x01);
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lcd_delay(500000);
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lcd_cmd(0x06);
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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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lcd_data(*str++);
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}
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}
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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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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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lcd_data('0');
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return;
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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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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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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 /= 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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void display_mode(void) {
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lcd_cmd(0x80);
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lcd_print_str("Mode: ");
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if (current_base == MODE_BIN)
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lcd_print_str("BIN ");
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else if (current_base == MODE_OCT)
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lcd_print_str("OCT ");
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else if (current_base == MODE_DEC)
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lcd_print_str("DEC ");
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else
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lcd_print_str("HEX ");
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}
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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_num(input_num, current_base);
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lcd_print_str(" ");
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}
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void display_operator_feedback(const char *op_symbol) {
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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);
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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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for (col = 0; col < 4; col++) {
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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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if (row_bits != 0x0F) {
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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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}
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}
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}
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}
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LPC_GPIO0->FIOSET = COL_MASK;
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return 0xFF;
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}
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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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unsigned int is_valid_digit(unsigned int key) {
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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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if (current_base == MODE_DEC)
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current_base = MODE_BIN;
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else if (current_base == MODE_BIN)
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current_base = MODE_OCT;
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else if (current_base == MODE_OCT)
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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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/* ===== 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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input_num = 0;
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result_displayed = 0;
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}
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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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result = stored_num - input_num;
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else if (operation == OP_MUL)
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result = stored_num * input_num;
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else
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result = input_num;
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lcd_cmd(0xC0);
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lcd_print_str("Res: ");
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lcd_print_num(result, current_base);
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lcd_print_str(" ");
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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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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;
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display_input();
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}
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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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unsigned int seg_pattern;
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if (operation == OP_NONE && result_displayed == 0)
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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
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else if (result_displayed == 1)
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seg_pattern = 0x4F | 0x80; // '3' + DP
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else
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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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LPC_GPIO1->FIOSET = DIGIT_EN;
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delay(3000);
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}
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}
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