/*
An example analogue clock using a TFT LCD screen to show the time
use of some of the drawing commands with the library.
For a more accurate clock, it would be better to use the RTClib library.
But this is just a demo.
This sketch uses font 4 only.
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 a sketch by Gilchrist 6/2/2014 1.0
*/
#include <SPI.h>
#include <TFT_eSPI.h> // Hardware-specific library
#define TFT_GREY 0x5AEB
TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
float sx = 0, sy = 1, mx = 1, my = 0, hx = -1, hy = 0; // Saved H, M, S x & y multipliers
float sdeg=0, mdeg=0, hdeg=0;
uint16_t osx=120, osy=120, omx=120, omy=120, ohx=120, ohy=120; // Saved H, M, S x & y coords
uint16_t x0=0, x1=0, yy0=0, yy1=0;
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
bool initial = 1;
void setup(void) {
tft.init();
tft.setRotation(0);
//tft.fillScreen(TFT_BLACK);
//tft.fillScreen(TFT_RED);
//tft.fillScreen(TFT_GREEN);
//tft.fillScreen(TFT_BLUE);
//tft.fillScreen(TFT_BLACK);
tft.fillScreen(TFT_GREY);
tft.setTextColor(TFT_WHITE, TFT_GREY); // Adding a background colour erases previous text automatically
// Draw clock face
tft.fillCircle(120, 120, 118, TFT_GREEN);
tft.fillCircle(120, 120, 110, TFT_BLACK);
// Draw 12 lines
for(int i = 0; i<360; i+= 30) {
sx = cos((i-90)*0.0174532925);
sy = sin((i-90)*0.0174532925);
x0 = sx*114+120;
yy0 = sy*114+120;
x1 = sx*100+120;
yy1 = sy*100+120;
tft.drawLine(x0, yy0, x1, yy1, TFT_GREEN);
}
// Draw 60 dots
for(int i = 0; i<360; i+= 6) {
sx = cos((i-90)*0.0174532925);
sy = sin((i-90)*0.0174532925);
x0 = sx*102+120;
yy0 = sy*102+120;
// Draw minute markers
tft.drawPixel(x0, yy0, TFT_WHITE);
// Draw main quadrant dots
if(i==0 || i==180) tft.fillCircle(x0, yy0, 2, TFT_WHITE);
if(i==90 || i==270) tft.fillCircle(x0, yy0, 2, TFT_WHITE);
}
tft.fillCircle(120, 121, 3, TFT_WHITE);
// Draw text at position 120,260 using fonts 4
// Only font numbers 2,4,6,7 are valid. Font 6 only contains characters [space] 0 1 2 3 4 5 6 7 8 9 : . - a p m
// Font 7 is a 7 segment font and only contains characters [space] 0 1 2 3 4 5 6 7 8 9 : .
tft.drawCentreString("Time flies",120,260,4);
targetTime = millis() + 1000;
}
void loop() {
if (targetTime < millis()) {
targetTime += 1000;
ss++; // Advance second
if (ss==60) {
ss=0;
mm++; // Advance minute
if(mm>59) {
mm=0;
hh++; // Advance hour
if (hh>23) {
hh=0;
}
}
}
// Pre-compute hand degrees, x & y coords for a fast screen update
sdeg = ss*6; // 0-59 -> 0-354
mdeg = mm*6+sdeg*0.01666667; // 0-59 -> 0-360 - includes seconds
hdeg = hh*30+mdeg*0.0833333; // 0-11 -> 0-360 - includes minutes and seconds
hx = cos((hdeg-90)*0.0174532925);
hy = sin((hdeg-90)*0.0174532925);
mx = cos((mdeg-90)*0.0174532925);
my = sin((mdeg-90)*0.0174532925);
sx = cos((sdeg-90)*0.0174532925);
sy = sin((sdeg-90)*0.0174532925);
if (ss==0 || initial) {
initial = 0;
// Erase hour and minute hand positions every minute
tft.drawLine(ohx, ohy, 120, 121, TFT_BLACK);
ohx = hx*62+121;
ohy = hy*62+121;
tft.drawLine(omx, omy, 120, 121, TFT_BLACK);
omx = mx*84+120;
omy = my*84+121;
}
// Redraw new hand positions, hour and minute hands not erased here to avoid flicker
tft.drawLine(osx, osy, 120, 121, TFT_BLACK);
osx = sx*90+121;
osy = sy*90+121;
tft.drawLine(osx, osy, 120, 121, TFT_RED);
tft.drawLine(ohx, ohy, 120, 121, TFT_WHITE);
tft.drawLine(omx, omy, 120, 121, TFT_WHITE);
tft.drawLine(osx, osy, 120, 121, TFT_RED);
tft.fillCircle(120, 121, 3, TFT_RED);
}
}
static uint8_t conv2d(const char* p) {
uint8_t v = 0;
if ('0' <= *p && *p <= '9')
v = *p - '0';
return 10 * v + *++p - '0';
}
本文介绍Traffic Flow Template (TFT)的概念及其在不同PDP上下文中如何为数据包提供质量服务(QoS)，通过使用TFT，可以将匹配特定过滤器的数据路由到指定的PDP上下文。
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