static void button_readState() {
/* middle button - pause */
int button_press;
int button_release;
button_press = get_single_debounced_button_press(ANY_BUTTON);
button_release = get_single_debounced_button_release(ANY_BUTTON);
switch (g_middle_button.state) {
case BUTTON_STATE_RELEASED:
if (button_press & MIDDLE_BUTTON) {
g_middle_button.state = BUTTON_STATE_PRESSED;
if (g_motor_state.enabled) {
g_motor_state.enabled = false;
g_motor_state.direction = DIRECTION_FORWARD;
play_note(A(5), 200, 12);
} else {
g_motor_state.enabled = true;
play_note(A(5), 200, 12);
}
}
break;
case BUTTON_STATE_PRESSED:
if (button_release & MIDDLE_BUTTON) {
g_middle_button.state = BUTTON_STATE_RELEASED;
}
break;
}
/* bottom button - speed down */
switch (g_bottom_button.state) {
case BUTTON_STATE_RELEASED:
if (button_press & BOTTOM_BUTTON) {
g_bottom_button.state = BUTTON_STATE_PRESSED;
g_motor_state.speed = MIN(g_motor_state.speed + 5, 255);
}
break;
case BUTTON_STATE_PRESSED:
if (button_release & BOTTOM_BUTTON) {
g_bottom_button.state = BUTTON_STATE_RELEASED;
}
break;
}
/* top button - speed up */
switch (g_top_button.state) {
case BUTTON_STATE_RELEASED:
if (button_press & TOP_BUTTON) {
g_top_button.state = BUTTON_STATE_PRESSED;
g_motor_state.speed = MAX(g_motor_state.speed - 5, 0);
}
break;
case BUTTON_STATE_PRESSED:
if (button_release & TOP_BUTTON) {
g_top_button.state = BUTTON_STATE_RELEASED;
}
break;
}
}
int main()
{
lcd_init_printf();
clear(); // clear the LCD
printf("Time: ");
while (1)
{
unsigned char button = get_single_debounced_button_press(ANY_BUTTON);
switch (button)
{
case BUTTON_A:
play_note(A(4), 50, 10);
break;
case BUTTON_B:
play_note(B(4), 50, 10);
break;
case BUTTON_C:
play_note(C(5), 50, 10);
}
button = get_single_debounced_button_release(ANY_BUTTON);
switch (button)
{
case BUTTON_A:
play_note(A(5), 50, 10);
break;
case BUTTON_B:
play_note(B(5), 50, 10);
break;
case BUTTON_C:
play_note(C(6), 50, 10);
}
unsigned long ms = get_ms(); // get elapsed milliseconds
// convert to the current time in minutes, seconds, and hundredths of seconds
unsigned char centiseconds = (ms / 10) % 100;
unsigned char seconds = (ms / 1000) % 60;
unsigned char minutes = (ms / 60000) % 60;
lcd_goto_xy(0, 1); // go to the start of the second LCD row
// print as [m]m:ss.cc (m = minute, s = second, c = hundredth of second)
printf("%2u:%02u.%02u", minutes, seconds, centiseconds);
}
}
