460 lines
12 KiB
C
460 lines
12 KiB
C
#include <LPC17xx.h>
|
||
#include <stdbool.h>
|
||
|
||
/* ===================================================
|
||
* SMART CALCULATOR - LPC1768 (Final v2)
|
||
* Supports BIN, BASE4, OCT, DEC, and HEX
|
||
* with 4x4 keypad, LCD, and 7-seg status display.
|
||
*
|
||
* Features:
|
||
* - Base-aware arithmetic and I/O
|
||
* - HEX: double MODE button press within 2s = operator mode
|
||
* - Hardware 1ms timing via SysTick
|
||
* ===================================================
|
||
*/
|
||
|
||
/* 7-Segment patterns for 0–F */
|
||
const unsigned char seven_seg[16] = {
|
||
0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,
|
||
0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71
|
||
};
|
||
|
||
/* ===== Pin & Mode Definitions ===== */
|
||
#define COL_BASE 15
|
||
#define ROW_BASE 19
|
||
#define COL_MASK (0x0F << COL_BASE)
|
||
#define ROW_MASK (0x0F << ROW_BASE)
|
||
|
||
#define SEG_SHIFT 4
|
||
#define DIGIT_EN (1 << 23)
|
||
|
||
#define LCD_DATA_SHIFT 23
|
||
#define LCD_DATA_MASK (0x0F << LCD_DATA_SHIFT)
|
||
#define LCD_RS (1 << 27)
|
||
#define LCD_EN (1 << 28)
|
||
|
||
#define MODE_BUTTON (1 << 12)
|
||
|
||
/* Supported Bases */
|
||
#define MODE_BIN 2
|
||
#define MODE_BASE4 4
|
||
#define MODE_OCT 8
|
||
#define MODE_DEC 10
|
||
#define MODE_HEX 16
|
||
|
||
/* Operators */
|
||
#define OP_NONE 0
|
||
#define OP_ADD 1
|
||
#define OP_SUB 2
|
||
#define OP_MUL 3
|
||
#define OP_CLR 4
|
||
#define OP_RES 5
|
||
|
||
/* ===== Global Variables ===== */
|
||
unsigned int current_base;
|
||
unsigned int input_num;
|
||
unsigned int stored_num;
|
||
unsigned int result;
|
||
unsigned int operation;
|
||
unsigned char result_displayed;
|
||
|
||
unsigned int key, last_key, stable;
|
||
unsigned int button_state, last_button_state, button_stable;
|
||
|
||
unsigned char hex_operator_mode;
|
||
unsigned long last_mode_press_time;
|
||
|
||
/* Millisecond counter via SysTick */
|
||
volatile unsigned long sys_millis = 0;
|
||
|
||
/* ===== Function Declarations ===== */
|
||
void delay(volatile unsigned int d);
|
||
void lcd_delay(unsigned long r);
|
||
void lcd_write_nibble(unsigned char nibble, unsigned char is_data);
|
||
void lcd_cmd(unsigned char cmd);
|
||
void lcd_data(unsigned char data);
|
||
void lcd_init(void);
|
||
void lcd_print_str(const char *str);
|
||
void lcd_print_num(unsigned int num, unsigned int base);
|
||
void display_mode(void);
|
||
void display_input(void);
|
||
void display_result(void);
|
||
unsigned int scan_keypad(void);
|
||
unsigned int scan_mode_button(void);
|
||
unsigned int is_valid_digit(unsigned int key);
|
||
void change_mode(void);
|
||
void handle_mode_button(void);
|
||
void operate(unsigned int op);
|
||
void perform_operation(void);
|
||
unsigned char is_operator_active(unsigned int key);
|
||
unsigned int base_arith(unsigned int a, unsigned int b,
|
||
unsigned int op, unsigned int base);
|
||
unsigned long millis(void);
|
||
|
||
/* ===== Utility ===== */
|
||
void delay(volatile unsigned int d) {
|
||
while (d--) __NOP();
|
||
}
|
||
|
||
void lcd_delay(unsigned long r) {
|
||
volatile unsigned long i;
|
||
for (i = 0; i < r; i++)
|
||
;
|
||
}
|
||
|
||
/* ===== SysTick Millisecond Tracker ===== */
|
||
void SysTick_Handler(void) {
|
||
sys_millis++;
|
||
}
|
||
|
||
unsigned long millis(void) {
|
||
return sys_millis;
|
||
}
|
||
|
||
/* ===== LCD Control ===== */
|
||
void lcd_write_nibble(unsigned char nibble, unsigned char is_data) {
|
||
unsigned long temp;
|
||
temp = (nibble & 0x0F) << LCD_DATA_SHIFT;
|
||
LPC_GPIO0->FIOPIN = (LPC_GPIO0->FIOPIN & ~LCD_DATA_MASK) | temp;
|
||
|
||
if (is_data)
|
||
LPC_GPIO0->FIOSET = LCD_RS;
|
||
else
|
||
LPC_GPIO0->FIOCLR = LCD_RS;
|
||
|
||
LPC_GPIO0->FIOSET = LCD_EN;
|
||
lcd_delay(100);
|
||
LPC_GPIO0->FIOCLR = LCD_EN;
|
||
lcd_delay(250000);
|
||
}
|
||
|
||
void lcd_cmd(unsigned char cmd) {
|
||
lcd_write_nibble(cmd >> 4, 0);
|
||
lcd_write_nibble(cmd, 0);
|
||
}
|
||
|
||
void lcd_data(unsigned char data) {
|
||
lcd_write_nibble(data >> 4, 1);
|
||
lcd_write_nibble(data, 1);
|
||
}
|
||
|
||
void lcd_init(void) {
|
||
lcd_delay(5000000);
|
||
lcd_write_nibble(0x03, 0);
|
||
lcd_delay(500000);
|
||
lcd_write_nibble(0x03, 0);
|
||
lcd_delay(500000);
|
||
lcd_write_nibble(0x03, 0);
|
||
lcd_delay(500000);
|
||
lcd_write_nibble(0x02, 0);
|
||
lcd_delay(500000);
|
||
|
||
lcd_cmd(0x28);
|
||
lcd_cmd(0x0C);
|
||
lcd_cmd(0x01);
|
||
lcd_delay(500000);
|
||
lcd_cmd(0x06);
|
||
}
|
||
|
||
void lcd_print_str(const char *str) {
|
||
while (*str)
|
||
lcd_data(*str++);
|
||
}
|
||
|
||
void lcd_print_num(int num, unsigned int base) {
|
||
char buffer[17];
|
||
int i = 0;
|
||
unsigned int unum;
|
||
|
||
if (base == MODE_DEC) {
|
||
if (num < 0) {
|
||
lcd_data('-');
|
||
num = -num;
|
||
}
|
||
}
|
||
|
||
unum = (unsigned int)num;
|
||
|
||
if (unum == 0) {
|
||
lcd_data('0');
|
||
return;
|
||
}
|
||
|
||
while (unum > 0 && i < 16) {
|
||
unsigned int d = unum % base;
|
||
buffer[i++] = (d < 10) ? ('0' + d) : ('A' + d - 10);
|
||
unum /= base;
|
||
}
|
||
|
||
while (i > 0)
|
||
lcd_data(buffer[--i]);
|
||
}
|
||
|
||
/* ===== Display Helpers ===== */
|
||
void display_mode(void) {
|
||
lcd_cmd(0x80);
|
||
lcd_print_str("Mode: ");
|
||
if (current_base == MODE_BIN)
|
||
lcd_print_str("BIN ");
|
||
else if (current_base == MODE_BASE4)
|
||
lcd_print_str("BASE4 ");
|
||
else if (current_base == MODE_OCT)
|
||
lcd_print_str("OCT ");
|
||
else if (current_base == MODE_DEC)
|
||
lcd_print_str("DEC ");
|
||
else {
|
||
lcd_print_str("HEX");
|
||
if (hex_operator_mode)
|
||
lcd_print_str("[OPS]");
|
||
else
|
||
lcd_print_str(" ");
|
||
}
|
||
}
|
||
|
||
void display_input(void) {
|
||
lcd_cmd(0xC0);
|
||
lcd_print_str("Input: ");
|
||
lcd_print_num(input_num, current_base);
|
||
lcd_print_str(" ");
|
||
}
|
||
|
||
void display_result(void) {
|
||
lcd_cmd(0xC0);
|
||
lcd_print_str("Result: ");
|
||
lcd_print_num(result, current_base);
|
||
lcd_print_str(" ");
|
||
}
|
||
|
||
/* ===== Keypad and Button ===== */
|
||
unsigned int scan_keypad(void) {
|
||
unsigned int col, row, row_bits;
|
||
for (col = 0; col < 4; col++) {
|
||
LPC_GPIO0->FIOSET = COL_MASK;
|
||
delay(50);
|
||
LPC_GPIO0->FIOCLR = (1 << (COL_BASE + col));
|
||
delay(200);
|
||
row_bits = (LPC_GPIO0->FIOPIN & ROW_MASK) >> ROW_BASE;
|
||
|
||
if (row_bits != 0x0F) {
|
||
for (row = 0; row < 4; row++) {
|
||
if (!(row_bits & (1 << row))) {
|
||
LPC_GPIO0->FIOSET = COL_MASK;
|
||
return col * 4 + row;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
LPC_GPIO0->FIOSET = COL_MASK;
|
||
return 0xFF;
|
||
}
|
||
|
||
unsigned int scan_mode_button(void) {
|
||
return ((LPC_GPIO2->FIOPIN & MODE_BUTTON) == 0) ? 1 : 0;
|
||
}
|
||
|
||
/* ===== Mode and Button ===== */
|
||
void change_mode(void) {
|
||
if (current_base == MODE_DEC)
|
||
current_base = MODE_BIN;
|
||
else if (current_base == MODE_BIN)
|
||
current_base = MODE_BASE4;
|
||
else if (current_base == MODE_BASE4)
|
||
current_base = MODE_OCT;
|
||
else if (current_base == MODE_OCT)
|
||
current_base = MODE_HEX;
|
||
else
|
||
current_base = MODE_DEC;
|
||
|
||
display_mode();
|
||
input_num = stored_num = result = 0;
|
||
operation = OP_NONE;
|
||
result_displayed = 0;
|
||
display_input();
|
||
}
|
||
|
||
void handle_mode_button(void) {
|
||
unsigned long now = millis();
|
||
|
||
if (button_stable == 3 && button_state == 1) {
|
||
if (current_base == MODE_HEX) {
|
||
if ((now - last_mode_press_time) < 2000) {
|
||
hex_operator_mode = !hex_operator_mode;
|
||
display_mode();
|
||
last_mode_press_time = 0;
|
||
} else {
|
||
last_mode_press_time = now;
|
||
}
|
||
} else {
|
||
change_mode();
|
||
}
|
||
}
|
||
}
|
||
|
||
/* ===== Validation ===== */
|
||
unsigned int is_valid_digit(unsigned int key) {
|
||
if (key >= 16)
|
||
return 0;
|
||
if (current_base == MODE_BIN && key >= 2)
|
||
return 0;
|
||
if (current_base == MODE_BASE4 && key >= 4)
|
||
return 0;
|
||
if (current_base == MODE_OCT && key >= 8)
|
||
return 0;
|
||
if (current_base == MODE_DEC && key >= 10)
|
||
return 0;
|
||
return 1;
|
||
}
|
||
|
||
/* ===== Arithmetic per base (optimized) ===== */
|
||
int base_arith(int a, int b, unsigned int op, unsigned int base) {
|
||
int r = 0;
|
||
|
||
switch (op) {
|
||
case OP_ADD:
|
||
r = a + b;
|
||
break;
|
||
|
||
case OP_SUB:
|
||
r = a - b;
|
||
break;
|
||
|
||
case OP_MUL:
|
||
r = a * b;
|
||
break;
|
||
|
||
default:
|
||
r = a;
|
||
break;
|
||
}
|
||
|
||
// For non-decimal modes, keep everything positive and base-limited
|
||
if (base != MODE_DEC) {
|
||
if (r < 0)
|
||
r = ((r % base) + base) % base;
|
||
else
|
||
r = r % (base * base * base * base * base); // safe wraparound for multi-digit bases
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
/* ===== Operation/Arithmetic Handling ===== */
|
||
void operate(unsigned int op) {
|
||
stored_num = input_num;
|
||
input_num = 0;
|
||
operation = op;
|
||
result_displayed = 0;
|
||
}
|
||
|
||
void perform_operation(void) {
|
||
result = base_arith(stored_num, input_num, operation, current_base);
|
||
display_result();
|
||
input_num = result;
|
||
operation = OP_NONE;
|
||
result_displayed = 1;
|
||
}
|
||
|
||
/* ===== Key Classifier ===== */
|
||
unsigned char is_operator_active(unsigned int key) {
|
||
if (key >= 11 && key <= 15) {
|
||
if (current_base == MODE_HEX)
|
||
return hex_operator_mode;
|
||
else
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* ===== MAIN ===== */
|
||
int main(void) {
|
||
current_base = MODE_DEC;
|
||
input_num = stored_num = result = 0;
|
||
operation = OP_NONE;
|
||
result_displayed = 0;
|
||
key = last_key = 0xFF;
|
||
stable = 0;
|
||
button_stable = 0;
|
||
button_state = last_button_state = 0;
|
||
hex_operator_mode = 0;
|
||
last_mode_press_time = 0;
|
||
|
||
/* ===== SystemClock & SysTick Setup ===== */
|
||
SystemCoreClockUpdate();
|
||
SysTick_Config(SystemCoreClock / 1000); // 1ms tick
|
||
|
||
/* ===== Peripheral Init ===== */
|
||
LPC_PINCON->PINSEL0 = 0;
|
||
LPC_PINCON->PINSEL1 = 0;
|
||
LPC_PINCON->PINSEL3 = 0;
|
||
LPC_PINCON->PINSEL4 = 0;
|
||
|
||
LPC_GPIO0->FIODIR |= COL_MASK;
|
||
LPC_GPIO0->FIODIR &= ~ROW_MASK;
|
||
LPC_GPIO0->FIOSET = COL_MASK;
|
||
|
||
LPC_GPIO2->FIODIR &= ~MODE_BUTTON;
|
||
|
||
LPC_GPIO0->FIODIR |= (0xFF << SEG_SHIFT);
|
||
LPC_GPIO1->FIODIR |= DIGIT_EN;
|
||
LPC_GPIO0->FIODIR |= LCD_DATA_MASK | LCD_RS | LCD_EN;
|
||
|
||
lcd_init();
|
||
display_mode();
|
||
display_input();
|
||
|
||
/* ===== Main Loop ===== */
|
||
while (1) {
|
||
key = scan_keypad();
|
||
button_state = scan_mode_button();
|
||
|
||
// Debounce keypad
|
||
if (key == last_key)
|
||
stable = (stable < 5) ? stable + 1 : stable;
|
||
else {
|
||
last_key = key;
|
||
stable = 0;
|
||
}
|
||
|
||
// Debounce button
|
||
if (button_state == last_button_state)
|
||
button_stable = (button_stable < 5) ? button_stable + 1 : button_stable;
|
||
else {
|
||
last_button_state = button_state;
|
||
button_stable = 0;
|
||
}
|
||
|
||
handle_mode_button();
|
||
|
||
if (stable == 3 && key != 0xFF) {
|
||
if (is_operator_active(key)) {
|
||
switch (key) {
|
||
case 11: operate(OP_ADD); display_input(); break;
|
||
case 12: input_num = stored_num = result = 0;
|
||
operation = OP_NONE; display_input(); break;
|
||
case 13: operate(OP_SUB); display_input(); break;
|
||
case 14: operate(OP_MUL); display_input(); break;
|
||
case 15: perform_operation(); break;
|
||
}
|
||
} else if (is_valid_digit(key)) {
|
||
result_displayed = 0;
|
||
input_num = input_num * current_base + key;
|
||
display_input();
|
||
}
|
||
stable = 5;
|
||
}
|
||
|
||
// Simple 7-seg base display
|
||
LPC_GPIO0->FIOCLR = (0xFF << SEG_SHIFT);
|
||
unsigned int segval = 0x3F; // default '0'
|
||
if (current_base == MODE_BIN) segval = seven_seg[2];
|
||
else if (current_base == MODE_BASE4) segval = seven_seg[4];
|
||
else if (current_base == MODE_OCT) segval = seven_seg[8];
|
||
else if (current_base == MODE_DEC) segval = seven_seg[0];
|
||
else if (current_base == MODE_HEX) segval = seven_seg[0xA]; // 'A' for HEX
|
||
|
||
LPC_GPIO0->FIOSET = (segval << SEG_SHIFT);
|
||
LPC_GPIO1->FIOSET = DIGIT_EN;
|
||
|
||
delay(3000);
|
||
}
|
||
}
|