103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
/*
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Blink
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The circuit:
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* VFD Data to digital pin 2 (blue)
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* VFD Clock to digital pin 3 (yellow)
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* VFD Chip select to digital pin 4 (green)
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* VFD VCC (power) to 5V
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* VFD Ground (power) to Ground
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*/
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// include the library code:
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#include <SPI_VFD.h>
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// initialize the library with the numbers of the interface pins
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SPI_VFD vfd(2, 3, 4);
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// | 1 2|
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// |12345678901234567890|
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String vfd_line_top = "Booting up... ";
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String vfd_line_bottom = "Waiting for stream. ";
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unsigned int vfd_line_position = 0;
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bool vfd_line_print = false;
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unsigned long millis_last_incoming_ping = 0;
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unsigned long millis_last_outgoing_ping = 0;
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// the setup function runs once when you press reset or power the board
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void setup() {
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// initialize digital pin LED_BUILTIN as an output.
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite(LED_BUILTIN, LOW);
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Serial.begin(9600);
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// set up the VFD's number of columns and rows:
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vfd.begin(20, 2);
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update_display();
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}
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void update_display() {
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vfd.setCursor(0, 0);
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vfd.print(vfd_line_top);
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vfd.setCursor(0, 1);
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vfd.print(vfd_line_bottom);
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}
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void check_serial() {
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while (Serial.available() > 0) {
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millis_last_incoming_ping = millis();
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int incomingByte = Serial.read();
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if (incomingByte == 0 || incomingByte == '^') {
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incomingByte = vfd_line_position = 0;
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}
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if (incomingByte < 32) {
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continue;
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}
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if (vfd_line_position < 20) {
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vfd_line_top.setCharAt(vfd_line_position, incomingByte);
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} else {
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vfd_line_bottom.setCharAt(vfd_line_position - 20, incomingByte);
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}
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vfd_line_position = (vfd_line_position + 1) % 40;
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vfd_line_print = vfd_line_position == 0;
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if (vfd_line_print) {
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break;
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}
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}
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}
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// the loop function runs over and over again forever
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void loop() {
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// We've been running for over 50 days and wrapped to zero. Reset all our timers
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if (millis() < 10000 && (millis_last_outgoing_ping > 10000 || millis_last_incoming_ping > 10000)) {
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millis_last_outgoing_ping = 0;
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millis_last_incoming_ping = 0;
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}
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check_serial();
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// If it's been 10 seconds since last incoming data
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if (millis() - millis_last_incoming_ping > 30000) {
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// |12345678901234567890|
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vfd_line_top = "Error stream is down";
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vfd_line_bottom = "Verify or restart...";
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vfd_line_print = true;
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millis_last_incoming_ping = millis();
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}
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// Send outgoing ping every 5 seconds if we can.
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if (millis() - millis_last_outgoing_ping > 30000 && Serial.availableForWrite()) {
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Serial.write('^');
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millis_last_outgoing_ping = millis();
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}
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// If we have something to print, print it
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if (vfd_line_print) {
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vfd_line_print = false;
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update_display();
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}
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delay(100);
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}
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