/*
An example digital clock using a TFT LCD screen to show the time.
Demonstrates use of the font printing routines. (Time updates but date does not.)
It uses the time of compile/upload to set the time
For a more accurate clock, it would be better to use the RTClib library.
But this is just a demo...
Make sure all the display driver and pin connections are correct by
editing the User_Setup.h file in the TFT_eSPI library folder.
#########################################################################
###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
#########################################################################
Based on clock sketch by Gilchrist 6/2/2014 1.0
A few colour codes:
code color
0x0000 Black
0xFFFF White
0xBDF7 Light Gray
0x7BEF Dark Gray
0xF800 Red
0xFFE0 Yellow
0xFBE0 Orange
0x79E0 Brown
0x7E0 Green
0x7FF Cyan
0x1F Blue
0xF81F Pink
*/
#include <TFT_eSPI.h> // Hardware-specific library
#include <SPI.h>
#define TFT_MISO 19
#define TFT_MOSI 23
#define TFT_SCLK 18
#define TFT_CS 15 // Chip select control pin
#define TFT_DC 2 // Data Command control pin
#define TFT_RST 4 // Reset pin (could connect to RST pin)
#define TFT_GREY 0x5AEB
TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
uint32_t targetTime = 0; // for next 1 second timeout
static uint8_t conv2d(const char* p); // Forward declaration needed for IDE 1.6.x
uint8_t hh = conv2d(__TIME__), mm = conv2d(__TIME__ + 3), ss = conv2d(__TIME__ + 6); // Get H, M, S from compile time
byte omm = 99, oss = 99;
byte xcolon = 0, xsecs = 0;
unsigned int colour = 0;
void setup(void) {
//Serial.begin(115200);
tft.init();
tft.setRotation(1);
tft.fillScreen(TFT_BLACK);
tft.setTextSize(1);
tft.setTextColor(TFT_YELLOW, TFT_BLACK);
targetTime = millis() + 1000;
}
void loop() {
if (targetTime < millis()) {
// Set next update for 1 second later
targetTime = millis() + 1000;
// Adjust the time values by adding 1 second
ss++; // Advance second
if (ss == 60) { // Check for roll-over
ss = 0; // Reset seconds to zero
omm = mm; // Save last minute time for display update
mm++; // Advance minute
if (mm > 59) { // Check for roll-over
mm = 0;
hh++; // Advance hour
if (hh > 23) { // Check for 24hr roll-over (could roll-over on 13)
hh = 0; // 0 for 24 hour clock, set to 1 for 12 hour clock
}
}
}
// Update digital time
int xpos = 0;
int ypos = 85; // Top left corner ot clock text, about half way down
int ysecs = ypos + 24;
if (omm != mm) { // Redraw hours and minutes time every minute
omm = mm;
// Draw hours and minutes
if (hh < 10) xpos += tft.drawChar('0', xpos, ypos, 8); // Add hours leading zero for 24 hr clock
xpos += tft.drawNumber(hh, xpos, ypos, 8); // Draw hours
xcolon = xpos; // Save colon coord for later to flash on/off later
xpos += tft.drawChar(':', xpos, ypos - 8, 8);
if (mm < 10) xpos += tft.drawChar('0', xpos, ypos, 8); // Add minutes leading zero
xpos += tft.drawNumber(mm, xpos, ypos, 8); // Draw minutes
xsecs = xpos; // Sae seconds 'x' position for later display updates
}
if (oss != ss) { // Redraw seconds time every second
oss = ss;
xpos = xsecs;
if (ss % 2) { // Flash the colons on/off
tft.setTextColor(0x39C4, TFT_BLACK); // Set colour to grey to dim colon
tft.drawChar(':', xcolon, ypos - 8, 8); // Hour:minute colon
xpos += tft.drawChar(':', xsecs, ysecs, 6); // Seconds colon
tft.setTextColor(TFT_YELLOW, TFT_BLACK); // Set colour back to yellow
}
else {
tft.drawChar(':', xcolon, ypos - 8, 8); // Hour:minute colon
xpos += tft.drawChar(':', xsecs, ysecs, 6); // Seconds colon
}
//Draw seconds
if (ss < 10) xpos += tft.drawChar('0', xpos, ysecs, 6); // Add leading zero
tft.drawNumber(ss, xpos, ysecs, 6); // Draw seconds
}
}
}
// Function to extract numbers from compile time string
static uint8_t conv2d(const char* p) {
uint8_t v = 0;
if ('0' <= *p && *p <= '9')
v = *p - '0';
return 10 * v + *++p - '0';
}