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utility.c
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utility.c
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/*
* @file utility.c
*
* @date Jul 24, 2017
* @author hamster
*
* Utility functions
*
*/
#include "system.h"
#include "utility.h"
/**
* @brief Determine if a button is being pressed.
* @return Button pressed, with long press mask if long pressed
*
* Buttons are debounced for a few milliseconds
* Buttons held down for longer than the defined long press duration are sent
* as a long press button
*/
int getButton(void){
int longPress = 0;
int button = 0;
if(isButtonDown(USER_BUTTON_1)){
// Debounce
nrf_delay_ms(BUTTON_DEBOUNCE_MS);
if(isButtonDown(USER_BUTTON_1)){
button = USER_BUTTON_1;
while(isButtonDown(USER_BUTTON_1)){
nrf_delay_ms(1);
longPress++;
if(longPress > BUTTON_LONG_PRESS_MS){
break;
}
}
}
}
if(isButtonDown(USER_BUTTON_2)){
// Debounce
nrf_delay_ms(BUTTON_DEBOUNCE_MS);
if(isButtonDown(USER_BUTTON_2)){
button = USER_BUTTON_2;
while(isButtonDown(USER_BUTTON_2)){
nrf_delay_ms(1);
longPress++;
if(longPress > BUTTON_LONG_PRESS_MS){
break;
}
}
}
}
if(isButtonDown(USER_BUTTON_3)){
// Debounce
nrf_delay_ms(BUTTON_DEBOUNCE_MS);
if(isButtonDown(USER_BUTTON_3)){
button = USER_BUTTON_3;
while(isButtonDown(USER_BUTTON_3)){
nrf_delay_ms(1);
longPress++;
if(longPress > BUTTON_LONG_PRESS_MS){
break;
}
}
}
}
if(isButtonDown(USER_BUTTON_4)){
// Debounce
nrf_delay_ms(BUTTON_DEBOUNCE_MS);
if(isButtonDown(USER_BUTTON_4)){
button = USER_BUTTON_4;
while(isButtonDown(USER_BUTTON_4)){
nrf_delay_ms(1);
longPress++;
if(longPress > BUTTON_LONG_PRESS_MS){
break;
}
}
}
}
if(isButtonDown(TAIL_TOUCH)){
// Debounce
nrf_delay_ms(BUTTON_DEBOUNCE_MS);
if(isButtonDown(TAIL_TOUCH)){
button = TAIL_TOUCH;
while(isButtonDown(TAIL_TOUCH)){
nrf_delay_ms(1);
longPress++;
if(longPress > BUTTON_LONG_PRESS_MS){
break;
}
}
}
}
if(isButtonDown(EAR_TOUCH)){
// Debounce
nrf_delay_ms(BUTTON_DEBOUNCE_MS);
if(isButtonDown(EAR_TOUCH)){
button = EAR_TOUCH;
while(isButtonDown(EAR_TOUCH)){
nrf_delay_ms(1);
longPress++;
if(longPress > BUTTON_LONG_PRESS_MS){
break;
}
}
}
}
if(longPress > BUTTON_LONG_PRESS_MS){
button |= LONG_PRESS_MASK;
}
return button;
}
/**
* @brief Get a string from the user
* @param string Where to place the chars
* @param len Max length
* @param point Start point to draw string
* @param box Bounding box of chars to erase
*
* Draws the string as entered from the point passed in
* Blinks the cursor every second
*/
void getString(char* string, int len, nrf_gfx_point_t *point, nrf_gfx_rect_t *box){
int button;
bool done = false;
int pos = 0;
int lastTick = 0;
int changed = true;
// Clear the string
memset(string, 0, len);
while(!done){
// Display the current string
if(changed){
nrf_gfx_rect_draw(p_lcd, box, 0, LCD_COLOR_BLACK, true);
nrf_gfx_print(p_lcd, point,
LCD_COLOR_WHITE, string, font_8_point, true);
changed = false;
}
button = getButton();
switch(button){
case USER_BUTTON_1:
case USER_BUTTON_1_LONG:
// +
// If this entry is null, zip to the letters first
if(string[pos] > LAST_ALLOWED_CHAR || string[pos] < FIRST_ALLOWED_CHAR){
string[pos] = FIRST_LETTER - 1;
}
if(string[pos] < LAST_ALLOWED_CHAR && string[pos]){
string[pos]++;
}
else{
string[pos] = FIRST_ALLOWED_CHAR;
}
changed = true;
break;
case USER_BUTTON_2:
case USER_BUTTON_2_LONG:
// -
// If this entry is null, zip to the letters first
if(string[pos] > LAST_ALLOWED_CHAR || string[pos] < FIRST_ALLOWED_CHAR){
string[pos] = LAST_LETTER + 1;
}
if(string[pos] > FIRST_ALLOWED_CHAR){
string[pos]--;
}
else{
string[pos] = LAST_ALLOWED_CHAR;
}
changed = true;
break;
case USER_BUTTON_3:
if(pos < len - 1) pos++;
// ENT
break;
case USER_BUTTON_4:
if(pos > 0) pos--;
// BACK
break;
case USER_BUTTON_3_LONG:
// Done
done = true;
// Hold here until the user lets go
printf("String: %s\n", string);
nrf_gfx_rect_draw(p_lcd, box, 0, LCD_COLOR_BLACK, true);
nrf_gfx_print(p_lcd, point,
LCD_COLOR_WHITE, "SAVED", font_8_point, true);
while(isButtonDown(USER_BUTTON_3));
break;
default:
break;
}
}
}
/**
* @brief Detects if a button is being held down
* @param button Is this button pressed down?
* @return true if button is pressed down
*/
bool isButtonDown(int button){
if(nrf_gpio_pin_read(button) == BUTTON_PRESSED){
return true;
}
return false;
}
/**
* @brief Pause the program until a button has been pressed and released
* @param button Wait on this button
*/
void pauseUntilPress(int button){
while(true){
if(nrf_gpio_pin_read(button) == BUTTON_PRESSED){
// Debounce
nrf_delay_ms(button);
if(nrf_gpio_pin_read(button) == BUTTON_PRESSED){
while(nrf_gpio_pin_read(button) == BUTTON_PRESSED);
return;
}
}
}
}
/**
* @brief Beeps the speaker for a duration at a certain frequency
* @param duration How long to beep
* @param frequency Tone freq in hz
*
* @note Busy waits, frequency might not be exact, might sound uneven if the softdevice needs to do BLE things
*/
void beep(int duration, int frequency){
// Figure out how many beeps
float period = 1000 / (float)frequency;
long counter = period * duration;
float delay = period / 2;
//printf("Duration: %d Freq: %d Period: %f Count: %ld Delay: %f\n", duration, frequency, period, counter, delay);
for(long i = 0; i < counter; i++){
nrf_gpio_pin_write(SPEAKER, 1);
nrf_delay_us(delay * 1000);
nrf_gpio_pin_write(SPEAKER, 0);
nrf_delay_us(delay * 1000);
}
}
/**
* @brief Check if a string is blank
* @param string String to check
* @param len Number of chars to check
* @return true if all chars are null
*/
bool stringIsBlank(char *string, int len){
for(int i = 0; i < len; i++){
// Is the char a null or a space char?
if(!((string[i] == '\0') || (string[i] == ' '))){
// Nope, the string has something in it
return false;
}
}
return true;
}