aadit/MIT-Curricular
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Updated data for ES

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This commit is contained in:
sherlock 2025-10-16 12:59:30 +05:30
parent 5c5d001759
commit fd3ec40397
1 changed files with 49 additions and 14 deletions
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63
ES/Project/code.c
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@ -19,15 +19,19 @@
* RS: P0.27
* EN: P0.28
*
* MODE BUTTON:
* P2.12 (Input, internal pull-up)
*
* KEY FUNCTIONS:
* 0-9: Digit input (valid in all bases based on base)
* A-F: Digit input (valid only in appropriate base)
* Key A (10): Mode/Base selection (cycles: BIN->OCT->DEC->HEX)
* Key A (10): Digit input (value 10 in HEX mode)
* Key B (11): Addition (+)
* Key C (12): Clear (C)
* Key D (13): Subtraction (-)
* Key E (14): Multiplication (*)
* Key F (15): Equals (=)
* P2.12 Button: Mode selection (cycles: DEC->BIN->OCT->HEX)
*/
// 7-Segment patterns
@ -52,6 +56,9 @@ const unsigned char seven_seg[16] = {
#define LCD_RS (1<<27)
#define LCD_EN (1<<28)
// Mode button defines
#define MODE_BUTTON (1<<12)
// Calculator states
#define MODE_BIN 2
#define MODE_OCT 8
@ -197,6 +204,11 @@ unsigned int scan_keypad(void){
return 0xFF;
}
unsigned int scan_mode_button(void){
// Return 1 if button is pressed (active low), 0 if not pressed
return ((LPC_GPIO2->FIOPIN & MODE_BUTTON) == 0) ? 1 : 0;
}
unsigned int is_valid_digit(unsigned int key){
if(key >= 16) return 0;
if(current_base == MODE_BIN && key >= 2) return 0;
@ -205,20 +217,39 @@ unsigned int is_valid_digit(unsigned int key){
return 1;
}
void change_mode(void){
if(current_base == MODE_DEC)
current_base = MODE_BIN;
else if(current_base == MODE_BIN)
current_base = MODE_OCT;
else if(current_base == MODE_OCT)
current_base = MODE_HEX;
else
current_base = MODE_DEC;
display_mode();
}
int main(void){
unsigned int key, last_key = 0xFF;
unsigned int stable = 0;
unsigned int button_state, last_button_state = 0;
unsigned int button_stable = 0;
// Configure pins
LPC_PINCON->PINSEL0 = 0;
LPC_PINCON->PINSEL1 = 0;
LPC_PINCON->PINSEL3 = 0;
LPC_PINCON->PINSEL4 = 0; // Configure P2.12
// Keypad: Columns output, Rows input
LPC_GPIO0->FIODIR |= COL_MASK;
LPC_GPIO0->FIODIR &= ~ROW_MASK;
LPC_GPIO0->FIOSET = COL_MASK;
// Mode button: Input with internal pull-up
LPC_GPIO2->FIODIR &= ~MODE_BUTTON; // Set as input
// Note: Internal pull-up is enabled by default on LPC17xx
// 7-Segment
LPC_GPIO0->FIODIR |= (0xFF << SEG_SHIFT);
LPC_GPIO1->FIODIR |= DIGIT_EN;
@ -232,8 +263,9 @@ int main(void){
for(;;){
key = scan_keypad();
button_state = scan_mode_button();
// Debounce
// Debounce keypad
if(key == last_key){
if(stable < 5) stable++;
} else {
@ -241,6 +273,21 @@ int main(void){
stable = 0;
}
// Debounce mode button
if(button_state == last_button_state){
if(button_stable < 5) button_stable++;
} else {
last_button_state = button_state;
button_stable = 0;
}
// Handle mode button press
if(button_stable == 3 && button_state == 1){
change_mode();
button_stable = 5; // Prevent multiple triggers
}
// Handle keypad input
if(stable == 3 && key != 0xFF){
// Key pressed and stable
@ -250,18 +297,6 @@ int main(void){
if(input_num > 9999) input_num = input_num % 10000;
display_input();
}
// Mode selection (Key A / 10)
else if(key == 10){
if(current_base == MODE_BIN)
current_base = MODE_OCT;
else if(current_base == MODE_OCT)
current_base = MODE_DEC;
else if(current_base == MODE_DEC)
current_base = MODE_HEX;
else
current_base = MODE_BIN;
display_mode();
}
// Addition (Key B / 11)
else if(key == 11){
stored_num = input_num;