ELEC2645 (2015/16)
Mobile Security System - Revision 1.0
Dependencies: FXOS8700Q N5110 SDFileSystem SRF02 mbed
Diff: main.cpp
- Revision:
- 6:dc1229224d8e
- Parent:
- 5:41cb88f47f42
- Child:
- 7:8ac5aee0c13e
--- a/main.cpp Sun May 01 16:53:56 2016 +0000
+++ b/main.cpp Mon May 02 13:47:17 2016 +0000
@@ -1,76 +1,59 @@
-/* ELEC2645 Project
-
-Week 19 - Take distance readings from the sensor and limited ticker interrupts
-Week 20 - Added the SD library
-Week 21 - Existing code has been edited to get consistent distance readings from the sensor and alll inputs and outputs have been added in main.h
-Week Easter -
-Week 22 -
-Week 23 -
-Week 24 -
-
-*/
-
+/* ELEC2645 Project */
#include "main.h"
int main()
{
-
- init_serial();
- init_K64F();
- init_buttons();
- init_variables();
- lcd.init();
-
- read_pin();
-
- buzzer.period(1.0/500.0); // 500 Hz
-
- buzzer.write(0.5);
+
+ init_serial(); // set up UART connection with PC for debugging
+ init_K64F(); // set up K64F on board LEDs and switches
+ init_buttons(); // set up the three external buttons
+ init_variables(); // initialise all variables to 0
+ lcd.init(); // initialise the Nokia 5110 LCD
- wait(2);
-
- screen_selection();
+ read_pin(); // read current pin from the SD card to the set_pin array
+
+ buzzer.period(1.0/500.0); // set the buzzer period - 500 Hz
+
+ buzzer.write(0.5); // duty cycle = 0.5 ----> Square Wave
+
+ wait(2); // wait two seconds to allow LCD to initialise
+
+ screen_selection(); // initial screen
wait(4);
g_next_state = 1;
-
- screen_selection();
-
+
+ screen_selection(); // menu screen
+
g_current_state = 1;
while (1) {
- if (g_button_0_flag) {
+ if (g_button_0_flag) { // if button_0 is pressed
pc.printf("g_button_0_flag = %d \n", g_button_0_flag);
g_button_0_flag = 0;
button_0_protocol();
-
- pc.printf("Current State = %d \n",g_current_state);
- pc.printf("Next State = %d \n",g_next_state);
}
- if (g_button_1_flag) {
+ if (g_button_1_flag) { // if button_1 is pressed
pc.printf("g_button_1_flag = %d \n", g_button_1_flag);
g_button_1_flag = 0;
-
+
button_1_protocol();
- pc.printf("Current State = %d \n",g_current_state);
- pc.printf("Next State = %d \n",g_next_state);
-
}
- if (g_button_c_flag) {
+ if (g_button_c_flag) { // if button_c is pressed
pc.printf("g_button_c_flag = %d \n", g_button_c_flag);
@@ -78,12 +61,9 @@
button_c_protocol();
- pc.printf("Current State = %d \n",g_current_state);
- pc.printf("Next State = %d \n",g_next_state);
-
}
- if (g_setting_distance_flag) {
+ if (g_setting_distance_flag) { // state 4 - initial setting distance
g_setting_distance_flag = 0;
@@ -91,92 +71,91 @@
}
- if (g_intruder_distance_flag) {
+ if (g_intruder_distance_flag) { // state 5 - current distance compared to initial setting distance
g_setting_distance_flag = 0;
get_intruder_distance();
}
-
- if (g_setting_screen_flag) {
-
+
+ if (g_setting_screen_flag) { // state 4 loading bar and percentage animation
+
g_setting_screen_flag = 0;
-
- loading_bar();
-
- }
+
+ setting_animation();
- if (g_led_buzzer_flag) {
+ }
+
+ if (g_led_buzzer_flag) { // toggles LED and buzzer
g_led_buzzer_flag = 0;
led_alarm = !led_alarm;
-
+
if (buzzer == 0) {
-
+
buzzer = 0.5;
-
+
}
-
+
else {
-
+
buzzer = 0;
-
- }
+
+ }
}
- if (g_pin_timeout_flag) {
+ if (g_pin_timeout_flag) { // state 7 - 20 second timeout
g_pin_timeout_flag = 0;
timeout_protocol();
-
-
+
}
-
+
if (g_next_state != g_current_state) {
-
+
pc.printf("TRANSITION \n");
- screen_selection(); // the screen is determined by the current value of g_next_state
-
+ screen_selection(); // the screen is determined by the value of g_next_state
+
g_current_state = g_next_state;
-
+
pc.printf("Current State = %d \n",g_current_state);
-
+
}
-
+
if (g_current_state == 4) {
-
- if (setting_distance_ticker_status == 0) {
+
+ if (setting_distance_ticker_status == 0) { // if the setting_distance ticker has not been attached
setting_distance_ticker_status = 1;
setting_distance.attach(&setting_distance_isr,0.1);
-
+
}
}
if (g_current_state == 5) {
- intruder_distance.attach(&intruder_distance_isr,0.1);
+ intruder_distance.attach(&intruder_distance_isr,0.1);
}
-
+
else {
-
+
intruder_distance.detach();
-
- }
-
+
+ }
+
sleep();
-
+
}
@@ -191,7 +170,7 @@
void init_K64F()
{
- // on-board LEDs are active-low, so set pin high to turn them off.
+ // on-board LEDs are active-low, so they are set high to turn them off.
r_led = 1;
g_led = 1;
b_led = 1;
@@ -205,11 +184,12 @@
void init_buttons()
{
-
+ // all external buttons trigger the relevant ISR when the voltage at the K64F pin falls
button_0.fall(&button_0_isr);
button_1.fall(&button_1_isr);
button_c.fall(&button_c_isr);
+ // enable the internal pull-down resistors
button_0.mode(PullDown);
button_1.mode(PullDown);
button_c.mode(PullDown);
@@ -240,6 +220,8 @@
g_current_state = 0;
+ reset_entered_pin();
+
}
void setting_distance_isr()
@@ -263,8 +245,8 @@
void setting_screen_isr()
{
g_setting_screen_flag = 1;
-
-}
+
+}
void button_0_isr()
{
@@ -290,53 +272,57 @@
}
-void loading_bar()
+void setting_animation()
{
- setting_alarm_counter = setting_alarm_counter + 5;
-
- if (setting_alarm_counter < 101) {
-
- lcd.drawRect(0,20,setting_alarm_counter,5,1);
-
+ setting_alarm_counter = setting_alarm_counter + 5; // increment setting_alarm_counter in steps of five
+
+ if (setting_alarm_counter < 101) {
+
+ lcd.drawRect(0,20,setting_alarm_counter,5,1); // prints the loading bar to the LCD
+
+ // format how the percentage is displayed depending on its value
if (setting_alarm_counter < 10) {
-
+
length = sprintf(buffer,"0%d%%",setting_alarm_counter);
-
+
}
-
- else {
-
+
+ else {
+
length = sprintf(buffer,"%d%%",setting_alarm_counter);
-
- }
-
- if (length <= 14) {
-
+
+ }
+
+ if (length <= 14) { // if length of string will fit on the screen ( WIDTH = 6 * 24 = 84 pixels )
+
if (setting_alarm_counter < 100) {
-
+
lcd.printString(buffer,33,4);
-
+
}
-
+
else {
-
- lcd.printString(buffer,30,4);
-
- }
-
- }
-
- lcd.refresh();
-
-
- }
-}
+
+ lcd.printString(buffer,30,4); // this string is four characters long and is therefore shifted to the left of the screen
+
+ }
+
+ }
+
+ lcd.refresh(); // refresh screen
+
+
+ }
+}
void button_0_protocol()
{
+
+ // states 2, 3, 6 and 7 require a pin to be entered
+
if (g_current_state == 2) {
- if (pin_counter < 4) {
+ if (pin_counter < 4) { // entered_pin has four elements
entered_pin[pin_counter] = 0;
@@ -344,13 +330,13 @@
}
- enter_pin();
+ enter_pin(); // prints '*' to the LCD
}
else if (g_current_state == 3) {
- if (pin_counter < 4) {
+ if (pin_counter < 4) { // entered_pin has four elements
entered_pin[pin_counter] = 0;
@@ -358,12 +344,26 @@
}
- enter_pin();
+ enter_pin(); // prints '*' to the LCD
}
else if (g_current_state == 6) {
+ if (pin_counter < 4) { // entered_pin has four elements
+
+ entered_pin[pin_counter] = 0;
+
+ pin_counter++;
+
+ }
+
+ enter_pin(); // prints '*' to the LCD
+
+ }
+
+ else if (g_current_state == 7) { // entered_pin has four elements
+
if (pin_counter < 4) {
entered_pin[pin_counter] = 0;
@@ -372,27 +372,13 @@
}
- enter_pin();
-
- }
-
- else if (g_current_state == 7) {
-
- if (pin_counter < 4) {
-
- entered_pin[pin_counter] = 0;
-
- pin_counter++;
-
- }
-
- enter_pin();
+ enter_pin(); // prints '*' to the LCD
}
else {
- g_next_state = fsm[g_current_state].nextState[0];
+ g_next_state = fsm[g_current_state].nextState[0]; // filters through fsm to find the next state
}
@@ -401,9 +387,11 @@
void button_1_protocol()
{
+ // states 2, 3, 6 and 7 require a pin to be entered
+
if (g_current_state == 2) {
- if (pin_counter < 4) {
+ if (pin_counter < 4) { // entered_pin has four elements
entered_pin[pin_counter] = 1;
@@ -411,13 +399,13 @@
}
- enter_pin();
+ enter_pin(); // prints '*' to the LCD
}
else if (g_current_state == 3) {
- if (pin_counter < 4) {
+ if (pin_counter < 4) { // entered_pin has four elements
entered_pin[pin_counter] = 1;
@@ -425,13 +413,13 @@
}
- enter_pin();
+ enter_pin(); // prints '*' to the LCD
}
else if (g_current_state == 6) {
- if (pin_counter < 4) {
+ if (pin_counter < 4) { // entered_pin has four elements
entered_pin[pin_counter] = 1;
@@ -439,13 +427,13 @@
}
- enter_pin();
+ enter_pin(); // prints '*' to the LCD
}
else if (g_current_state == 7) {
- if (pin_counter < 4) {
+ if (pin_counter < 4) { // entered_pin has four elements
entered_pin[pin_counter] = 1;
@@ -453,13 +441,13 @@
}
- enter_pin();
+ enter_pin(); // prints '*' to the LCD
}
else {
- g_next_state = fsm[g_current_state].nextState[1];
+ g_next_state = fsm[g_current_state].nextState[1]; // filters through fsm to find the next state
}
@@ -468,6 +456,9 @@
void button_c_protocol()
{
+ // states 2, 3, 6 and 7 require a pin to be entered
+ // the screen only progresses if the correct pin is entered
+
if (g_current_state == 2) {
screen_progression();
@@ -494,7 +485,7 @@
else {
- g_next_state = fsm[g_current_state].nextState[2];
+ g_next_state = fsm[g_current_state].nextState[2]; // filters through fsm to find the next state
}
@@ -502,15 +493,15 @@
void get_setting_distance()
{
- distance[setting_distance_counter] = srf02.getDistanceCm();
+ distance[setting_distance_counter] = srf02.getDistanceCm(); // distance array stores 10 distance readings
setting_distance_counter++;
- if (setting_distance_counter == 10) {
+ if (setting_distance_counter == 10) { // if distance array has 10 new readings (arrays are zero indexed)
setting_distance.detach();
- calculate_setting_distance();
+ calculate_setting_distance(); // find the average of the 10 distance readings
}
@@ -521,9 +512,9 @@
pin_timeout_counter++;
- seconds_till_timeout = 20 - pin_timeout_counter;
+ seconds_till_timeout = 21 - pin_timeout_counter; // timeout counts down from 20
- if (seconds_till_timeout == 0) {
+ if (seconds_till_timeout == 0) { // if 20 seconds passes
g_next_state = 8;
@@ -531,7 +522,9 @@
}
- else {
+ else { // less than 20 seconds has passed
+
+ // These if statements manage the formatting of the number of seconds remaining
if (seconds_till_timeout >= 10) {
@@ -545,6 +538,8 @@
}
+ // if the length of the formatted string will fit on the screen print it ( WIDTH = 14 * 6 = 84 pixels )
+
if (length <= 14)
lcd.printString(buffer,3,4);
@@ -557,15 +552,15 @@
void get_intruder_distance()
{
- distance[intruder_distance_counter] = srf02.getDistanceCm();
+ distance[intruder_distance_counter] = srf02.getDistanceCm(); // distance array stores 10 distance readings
intruder_distance_counter++;
- if (intruder_distance_counter == 10) {
+ if (intruder_distance_counter == 10) { // if distance array has 10 new readings (arrays are zero indexed)
intruder_distance.detach();
-
- calculate_intruder_distance();
+
+ calculate_intruder_distance(); // find the average of the 10 distance readings
}
@@ -576,19 +571,19 @@
for (int i = 0; i < 10; i++) {
- one_second_distance = one_second_distance + distance[i];
+ one_second_distance = one_second_distance + distance[i]; // add all 10 readings together
}
initial_setting_distance = (one_second_distance / 10);
-
+
pc.printf("Initial Setting Distance = %.2f cm\n",initial_setting_distance);
setting_distance_counter = 0;
one_second_distance = 0;
- transition.attach(&screen_5_transition,5);
+ transition.attach(&screen_5_transition,5); // transition to the set screen in five seconds
}
@@ -597,20 +592,20 @@
for (int i = 0; i < 10; i++) {
- one_second_distance = one_second_distance + distance[i];
+ one_second_distance = one_second_distance + distance[i]; // add all 10 distance readings together
}
one_second_avg_distance = one_second_distance / 10;
-
+
pc.printf("Intruder Distance = %.2f cm\n",one_second_avg_distance);
-
+
intruder_distance_counter = 0;
one_second_distance = 0;
- if (one_second_avg_distance > (1.05*initial_setting_distance)) {
+ if (one_second_avg_distance > (1.1*initial_setting_distance)) { // if the current average distance is 10% greater than the initial_setting_distance set off the alarm
g_next_state = 7;
@@ -620,7 +615,7 @@
}
- else if (one_second_avg_distance < (0.95 * initial_setting_distance)) {
+ else if (one_second_avg_distance < (0.9 * initial_setting_distance)) { // if the current average distance is 10% smaller than the initial_setting_distance set off the alarm
g_next_state = 7;
@@ -630,7 +625,7 @@
}
- else {
+ else { // if the current distance is within 10% of the initial_setting_distance carry on reading distance
intruder_distance.attach(&intruder_distance_isr,0.1);
@@ -644,18 +639,22 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("Mobile",27,1);
-
+
lcd.printString("Security",18,2);
lcd.printString("System",27,3);
-
+
lcd_border();
-
- led_alarm = 0;
-
+
+ // set LED and buzzer
+
+ led_alarm = 0;
+
buzzer.write(0.0);
-
+
lcd.refresh();
}
@@ -664,28 +663,36 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("Set Alarm",15,1);
lcd.printString("Set New Pin",9,4);
-
+
lcd_border();
-
+
for (int i = 0; i < WIDTH; i++) {
-
+
lcd.setPixel(i,24);
-
- }
-
- pin_timeout.detach();
-
+
+ }
+
+ // detach tickers
+
+ pin_timeout.detach();
+
alerts.detach();
-
- led_alarm = 0;
-
+
+ // set LED and buzzer
+
+ led_alarm = 0;
+
buzzer.write(0);
-
+
+ // reset counter
+
pin_timeout_counter = 0;
-
+
lcd.refresh();
}
@@ -694,18 +701,22 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("Enter 4 Digit",3,1);
lcd.printString("Pin Below",15,2);
-
+
pin_text_box();
-
+
lcd_border();
-
- led_alarm = 0;
-
+
+ // set the LED and buzzer
+
+ led_alarm = 0;
+
buzzer.write(0.0);
-
+
lcd.refresh();
}
@@ -714,18 +725,22 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("Enter New 4",9,1);
lcd.printString("Digit Pin",15,2);
-
+
pin_text_box();
lcd_border();
-
- led_alarm = 0;
-
+
+ // set the LED and buzzer
+
+ led_alarm = 0;
+
buzzer.write(0.0);
-
+
lcd.refresh();
}
@@ -734,23 +749,31 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("Setting",21,1);
-
+
lcd_border();
-
- lcd.drawRect(0,20,84,5,0);
-
- lcd.printString("0%",41,4);
-
+
+ lcd.drawRect(0,20,84,5,0); // blank setting bar
+
+ lcd.printString("0%",41,4); // 0% of setting complete
+
+ // reset counter
+
setting_alarm_counter = 0;
-
+
+ // set LED and buzzer
+
led_alarm = 0;
-
+
buzzer.write(0.0);
-
+
+ // attach tickers
+
alerts.attach(&led_buzzer_isr,0.5);
-
- setting_screen.attach(&setting_screen_isr,0.25);
+
+ setting_screen.attach(&setting_screen_isr,0.3);
lcd.refresh();
@@ -760,48 +783,62 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("Alarm Set",15,1);
lcd.printString("DEACTIVATE?",9,4);
-
+
lcd_border();
-
+
for (int i = 0; i < WIDTH; i++) {
-
+
lcd.setPixel(i,20);
-
- }
-
+
+ }
+
+ // detach tickers
+
alerts.detach();
-
+
setting_screen.detach();
-
+
+ // set LED and buzzer
+
led_alarm = 1;
-
+
buzzer.write(0.5);
-
+
+ // turn off buzzer after 1 second
+
buzz.attach(&alarm_setting_buzz,1);
lcd.refresh();
-
+
}
void state_6_screen()
{
lcd.clear();
+ // print the screen
+
lcd.printString("DEACTIVATE",12,1);
lcd.printString("Enter Pin",15,2);
-
+
lcd_border();
-
+
pin_text_box();
-
+
+ // set the LED and buzzer
+
led_alarm = 0;
-
+
buzzer.write(0.0);
-
+
+ // attach ticker
+
alerts.attach(&led_buzzer_isr,0.5);
lcd.refresh();
@@ -812,24 +849,28 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("INTRUDER",18,1);
lcd.printString("Enter Pin",15,2);
-
- lcd.printString("20",3,4);
-
+
lcd_border();
-
- lcd.drawRect(1,30,15,10,0);
-
+
+ lcd.drawRect(1,30,15,10,0);
+
pin_text_box();
-
+
+ // set the LED and buzzer
+
led_alarm = 0;
-
+
buzzer.write(0.0);
-
+
+ // attach tickers
+
alerts.attach(&led_buzzer_isr,0.5);
-
+
pin_timeout.attach(&pin_timeout_isr,1);
lcd.refresh();
@@ -840,22 +881,30 @@
{
lcd.clear();
+ // print the screen
+
lcd.printString("ALARM",27,1);
lcd.printString("TRIGGERED",15,2);
-
+
lcd.printString("Menu?",27,4);
-
+
lcd_border();
-
+
+ // set the LED and buzzer
+
led_alarm = 0;
-
+
buzzer.write(0.0);
-
+
+ // detach tickers
+
alerts.detach();
-
+
pin_timeout.detach();
-
+
+ // attach ticker
+
alerts.attach(&led_buzzer_isr,0.2);
lcd.refresh();
@@ -863,8 +912,8 @@
void screen_selection()
{
-
- reset_entered_pin();
+
+ reset_entered_pin(); // re-set each element of the entered pin array to -1
if (g_next_state == 0) {
@@ -919,151 +968,174 @@
state_8_screen();
}
-
+
}
void screen_5_transition()
{
g_next_state = 5;
-
- screen_selection();
+
+ screen_selection(); // sets the LCD to screen 5
g_current_state = 5;
-
- setting_distance_ticker_status = 0;
+
+ setting_distance_ticker_status = 0; // setting_distance ticker is off
- intruder_distance.attach(&intruder_distance_isr,0.1);
-
+ intruder_distance.attach(&intruder_distance_isr,0.1); // start reading distance to detect potential intruder
+
}
-void screen_progression()
+void screen_progression()
{
- if (g_current_state == 3) {
-
- if (pin_counter > 3) {
-
- change_pin();
-
- read_pin();
-
+ if (g_current_state == 3) { // set new pin state
+
+ if (pin_counter > 3) { // if a four digit pin has been entered
+
+ change_pin(); // save entered_pin to the SD card
+
+ read_pin(); // read the pin from the SD card to the set_pin array
+
g_next_state = fsm[g_current_state].nextState[2];
-
+
}
+
else {
-
+
g_next_state = fsm[g_current_state].nextState[3];
-
+
}
- }
-
- else {
-
- check_pin();
-
+
+ }
+
+ else { // if the current state is either 2, 6 or 7
+
+ check_pin(); // sets incorrect_pin_flag to 1 if entered pin doesn't match set_pin
+
if (incorrect_pin_flag == 1) {
-
+
incorrect_pin_flag = 0;
-
- g_next_state = fsm[g_current_state].nextState[3];
-
+
+ g_next_state = fsm[g_current_state].nextState[3]; // go to previous state or alarm triggered state
+
pc.printf("g_next_state = %d\n",g_next_state);
-
+
}
-
+
else {
-
- g_next_state = fsm[g_current_state].nextState[2];
-
+
+ g_next_state = fsm[g_current_state].nextState[2]; // proceed
+
pc.printf("g_next_state = %d\n",g_next_state);
-
+
}
-
+
}
-
-}
+
+}
void alarm_setting_buzz()
{
-
- buzzer.write(0.0);
-
-}
+
+ buzzer.write(0.0); // turn off buzzer
+
+}
+
+void pin_confirm()
+{
+ lcd.clear();
+
+ lcd_border();
+
+ lcd.printString("Press C",24,1);
+
+ lcd.printString("to",36,2);
+
+ lcd.printString("Confirm",24,3);
+
+ lcd.refresh();
+
+}
void lcd_border()
{
- lcd.drawRect(0,0,83,47,0);
-
- lcd.drawRect(1,1,81,45,0);
-
+ lcd.drawRect(0,0,83,47,0);
+
+ lcd.drawRect(1,1,81,45,0);
+
}
void pin_text_box()
{
- lcd.drawRect(15,30,15,10,0); // transparent, just outline
- lcd.drawRect(29,30,15,10,0); // transparent, just outline
- lcd.drawRect(43,30,15,10,0); // transparent, just outline
- lcd.drawRect(57,30,15,10,0); // transparent, just outline
-
-}
+ lcd.drawRect(15,30,15,10,0); // transparent box, just outline
+ lcd.drawRect(29,30,15,10,0); // transparent box, just outline
+ lcd.drawRect(43,30,15,10,0); // transparent box, just outline
+ lcd.drawRect(57,30,15,10,0); // transparent boox, just outline
+
+}
void enter_pin()
{
+
+ // current value of the pin_counter determines where '*' is printed
+
if (pin_counter == 1) {
-
+
lcd.printString("*",20,4);
-
+
}
-
+
else if (pin_counter == 2) {
-
+
lcd.printString("*",34,4);
-
+
}
-
+
else if (pin_counter == 3) {
-
+
lcd.printString("*",48,4);
-
+
}
-
+
else if (pin_counter == 4) {
-
+
lcd.printString("*",62,4);
-
- }
-
-}
+
+ confirm.attach(&pin_confirm,0.5); // 'Press C to Confirm' screen
+
+ }
+
+}
void check_pin()
{
for (int i = 0; i < 4; i++) {
-
- if (entered_pin[i] != set_pin[i]) {
-
+
+ if (entered_pin[i] != set_pin[i]) { // if any element of entered_pin doesn't match set_pin
+
pc.printf("entered pin doesn't match set pin...");
-
+
incorrect_pin_flag = 1;
-
+
break;
-
+
}
-
+
}
-
+
}
void reset_entered_pin()
{
- for (int i = 0; i < 4; i++) {
-
- entered_pin[i] = -1;
-
- }
-
- pin_counter = 0;
-
-}
-
+ for (int i = 0; i < 4; i++) {
+
+ entered_pin[i] = -1;
+
+ }
+
+ pin_counter = 0;
+
+}
+
void change_pin()
{
delete_file("/sd/test.txt");
@@ -1082,19 +1154,19 @@
for(int i = 0; i < 4; i++) {
- int pin_element = entered_pin[i];; // pin_element variable
+ int pin_element = entered_pin[i];; // pin_element takes on the value of each element in the entered_pin array
- fprintf(pin, "%d,%d\n",i,pin_element); // print formatted string to file (CSV)
+ fprintf(pin, "%d,%d\n",i,pin_element); // pin element is printed to SD card file (CSV)
}
for(int i = 0; i < 4; i++) {
- pc.printf("[%d] %d\n",i,entered_pin[i]);
+ pc.printf("[%d] %d\n",i,entered_pin[i]); // print to PC for debugging purposes
}
pc.printf("Done.\n");
- fclose(pin); // ensure you close the file after writing
+ fclose(pin); // close the file after writing
}
@@ -1103,35 +1175,43 @@
void read_pin()
{
pin = fopen("/sd/test.txt", "r");
-
+
int i = 0;
pc.printf("Reading into set_pin array...\n");
- while (fscanf(pin, "%d,%d",&index_array[i],&set_pin[i]) != EOF) {
+ while (fscanf(pin, "%d,%d",&index_array[i],&set_pin[i]) != EOF) { // EOF ---> End of File
i++; // read data into array and increment index
}
- fclose(pin); // ensure you close the file after reading
+ fclose(pin); // close the file after reading
for(int i = 0; i < 4 ; i++) {
- pc.printf("[%d] %d\n",i,set_pin[i]);
+ pc.printf("[%d] %d\n",i,set_pin[i]); // print to PC for debugging purposes
}
-
+
pc.printf("Done.\n");
-
+
}
-
+
void delete_file(char filename[])
{
pc.printf("Deleting file '%s'...",filename);
+
FILE *fp = fopen(filename, "r"); // try and open file
+
if (fp != NULL) { // if it does open...
+
fclose(fp); // close it
- remove(filename); // and then delete
+
+ remove(filename); // delete the file
+
pc.printf("Done!\n");
+
}
- // if we can't open it, it doesn't exist and so we can't delete it
-}
\ No newline at end of file
+
+ // if it can't be opened, it doesn't exist and can't be deleted
+
+}
\ No newline at end of file