ubitx-v5d/ubitx_20/ubitx_ui.ino

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/**
* The user interface of the ubitx consists of the encoder, the push-button on top of it
* and the 16x2 LCD display.
* The upper line of the display is constantly used to display frequency and status
* of the radio. Occasionally, it is used to provide a two-line information that is
* quickly cleared up.
*/
char byteToChar(byte srcByte){
if (srcByte < 10)
return 0x30 + srcByte;
else
return 'A' + srcByte - 10;
}
//returns true if the button is pressed
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int btnDown(void){
if (digitalRead(FBUTTON) == HIGH)
return 0;
else
return 1;
}
int enc_prev_state = 3;
/**
* The A7 And A6 are purely analog lines on the Arduino Nano
* These need to be pulled up externally using two 10 K resistors
*
* There are excellent pages on the Internet about how these encoders work
* and how they should be used. We have elected to use the simplest way
* to use these encoders without the complexity of interrupts etc to
* keep it understandable.
*
* The enc_state returns a two-bit number such that each bit reflects the current
* value of each of the two phases of the encoder
*
* The enc_read returns the number of net pulses counted over 50 msecs.
* If the puluses are -ve, they were anti-clockwise, if they are +ve, the
* were in the clockwise directions. Higher the pulses, greater the speed
* at which the enccoder was spun
*/
byte enc_state (void) {
return (analogRead(ENC_A) > 500 ? 1 : 0) + (analogRead(ENC_B) > 500 ? 2: 0);
}
int enc_read(void) {
int result = 0;
byte newState;
int enc_speed = 0;
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unsigned long start_at = millis();
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while (millis() - start_at < 50) { // check if the previous state was stable
newState = enc_state(); // Get current state
if (newState != enc_prev_state)
delay (1);
if (enc_state() != newState || newState == enc_prev_state)
continue;
//these transitions point to the encoder being rotated anti-clockwise
if ((enc_prev_state == 0 && newState == 2) ||
(enc_prev_state == 2 && newState == 3) ||
(enc_prev_state == 3 && newState == 1) ||
(enc_prev_state == 1 && newState == 0)){
result--;
}
//these transitions point o the enccoder being rotated clockwise
if ((enc_prev_state == 0 && newState == 1) ||
(enc_prev_state == 1 && newState == 3) ||
(enc_prev_state == 3 && newState == 2) ||
(enc_prev_state == 2 && newState == 0)){
result++;
}
enc_prev_state = newState; // Record state for next pulse interpretation
enc_speed++;
delay(1);
}
return(result);
}