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- // Use the Parola library to scroll text on the display
- //
- // Demonstrates the use of the scrolling function to display text received
- // from the serial interface
- //
- // User can enter text on the serial monitor and this will display as a
- // scrolling message on the display.
- // Speed for the display is controlled by a pot on SPEED_IN analog in.
- // Scrolling direction is controlled by a switch on DIRECTION_SET digital in.
- // Invert ON/OFF is set by a switch on INVERT_SET digital in.
- //
- // UISwitch library can be found at https://github.com/MajicDesigns/MD_UISwitch
- // MD_MAX72XX library can be found at https://github.com/MajicDesigns/MD_MAX72XX
- //
- #include <MD_Parola.h>
- #include <MD_MAX72xx.h>
- #include <SPI.h>
- // set to 1 if we are implementing the user interface pot, switch, etc
- #define USE_UI_CONTROL 0
- #if USE_UI_CONTROL
- #include <MD_UISwitch.h>
- #endif
- // Turn on debug statements to the serial output
- #define DEBUG 0
- #if DEBUG
- #define PRINT(s, x) { Serial.print(F(s)); Serial.print(x); }
- #define PRINTS(x) Serial.print(F(x))
- #define PRINTX(x) Serial.println(x, HEX)
- #else
- #define PRINT(s, x)
- #define PRINTS(x)
- #define PRINTX(x)
- #endif
- // Define the number of devices we have in the chain and the hardware interface
- // NOTE: These pin numbers will probably not work with your hardware and may
- // need to be adapted
- #define HARDWARE_TYPE MD_MAX72XX::FC16_HW
- #define MAX_DEVICES 4
- #define CS_PIN D4
- #define CLK_PIN D5
- #define DATA_PIN D7
- // HARDWARE SPI
- //MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
- // SOFTWARE SPI
- MD_Parola P = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);
- // Scrolling parameters
- #if USE_UI_CONTROL
- const uint8_t SPEED_IN = A5;
- const uint8_t DIRECTION_SET = 8; // change the effect
- const uint8_t INVERT_SET = 9; // change the invert
- const uint8_t SPEED_DEADBAND = 5;
- #endif // USE_UI_CONTROL
- uint8_t scrollSpeed = 25; // default frame delay value
- textEffect_t scrollEffect = PA_SCROLL_LEFT;
- textPosition_t scrollAlign = PA_LEFT;
- uint16_t scrollPause = 2000; // in milliseconds
- // Global message buffers shared by Serial and Scrolling functions
- #define BUF_SIZE 75
- char curMessage[BUF_SIZE] = { "" };
- char newMessage[BUF_SIZE] = { "Hello! Enter new message?" };
- bool newMessageAvailable = true;
- #if USE_UI_CONTROL
- MD_UISwitch_Digital uiDirection(DIRECTION_SET);
- MD_UISwitch_Digital uiInvert(INVERT_SET);
- void doUI(void)
- {
- // set the speed if it has changed
- {
- int16_t speed = map(analogRead(SPEED_IN), 0, 1023, 10, 150);
- if ((speed >= ((int16_t)P.getSpeed() + SPEED_DEADBAND)) ||
- (speed <= ((int16_t)P.getSpeed() - SPEED_DEADBAND)))
- {
- P.setSpeed(speed);
- scrollSpeed = speed;
- PRINT("\nChanged speed to ", P.getSpeed());
- }
- }
- if (uiDirection.read() == MD_UISwitch::KEY_PRESS) // SCROLL DIRECTION
- {
- PRINTS("\nChanging scroll direction");
- scrollEffect = (scrollEffect == PA_SCROLL_LEFT ? PA_SCROLL_RIGHT : PA_SCROLL_LEFT);
- P.setTextEffect(scrollEffect, scrollEffect);
- P.displayClear();
- P.displayReset();
- }
- if (uiInvert.read() == MD_UISwitch::KEY_PRESS) // INVERT MODE
- {
- PRINTS("\nChanging invert mode");
- P.setInvert(!P.getInvert());
- }
- }
- #endif // USE_UI_CONTROL
- void readSerial(void)
- {
- static char *cp = newMessage;
- while (Serial.available())
- {
- *cp = (char)Serial.read();
- if ((*cp == '\n') || (cp - newMessage >= BUF_SIZE-2)) // end of message character or full buffer
- {
- *cp = '\0'; // end the string
- // restart the index for next filling spree and flag we have a message waiting
- cp = newMessage;
- newMessageAvailable = true;
- }
- else // move char pointer to next position
- cp++;
- }
- }
- void setup()
- {
- Serial.begin(57600);
- Serial.print("\n[Parola Scrolling Display]\nType a message for the scrolling display\nEnd message line with a newline");
- #if USE_UI_CONTROL
- uiDirection.begin();
- uiInvert.begin();
- pinMode(SPEED_IN, INPUT);
- doUI();
- #endif // USE_UI_CONTROL
- P.begin();
- P.displayText(curMessage, scrollAlign, scrollSpeed, scrollPause, scrollEffect, scrollEffect);
- }
- void loop()
- {
- #if USE_UI_CONTROL
- doUI();
- #endif // USE_UI_CONTROL
- if (P.displayAnimate())
- {
- if (newMessageAvailable)
- {
- strcpy(curMessage, newMessage);
- newMessageAvailable = false;
- }
- P.displayReset();
- }
- readSerial();
- }
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