7x71 RGB柔性屏测试2：NTP网络时钟
NTP【Network Time Protocol】是用来使计算机时间同步化的一种协议，它可以使计算机对其服务器或时钟源（如石英钟，GPS等等)做同步化，它可以提供高精准度的时间校正，其精度在局域网内可达0.1ms，在互联网上绝大多数的地方其精度可以达到1-50ms。
1.前期准备：
Nodemcu (引脚对应的是8266的引脚，不是开发板上丝印对应的引脚)
Time库
Timezone库
2.安装烧录：
下载好两个库文件后，直接解压到arduino的libraries文件夹下就可以了。安装好库文件之后直接烧录进8266就可以啦：
#include <Arduino.h>
#include <HardwareSerial.h>
#include<stdlib.h>
#include <SoftwareSerial.h>
#include "DFRobot_SerialScreen771.h"
#include <TimeLib.h>
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#ifdef ARDUINO_AVR_UNO
SoftwareSerial Serial1( 2, 5 ); //RX, TX
#endif
DFRobot_SerialScreen771 screen;
const char ssid[] = "Develop"; //your network SSID (name)
const char pass[] = "ccbfudevelop"; // your network password
static const char ntpServerName[] = "ntp.aliyun.com"; //NTP服务器，阿里云
const int timeZone = 8; //时区，北京时间为+8
WiFiUDP Udp;
unsigned int localPort = 8888;// local port to listen for UDP packets
time_t getNtpTime();
void setup() {
Serial.begin( 115200 );
Serial1.begin( 19200 );
screen.begin( Serial1 );
screen.setDbgSerial( Serial );
while( WiFi.status() != WL_CONNECTED ) {
delay( 500 );
Serial.print( "." );
}
Serial.print( "IP number assigned by DHCP is " );
Serial.println( WiFi.localIP() );
Serial.println( "Starting UDP" );
Udp.begin( localPort );
Serial.print( "Local port: " );
Serial.println( Udp.localPort() );
Serial.println( "waiting for sync" );
setSyncProvider( getNtpTime );
setSyncInterval( 300 );
screen.setBrightness(eBrightLevel_5);
//screen.setMoveMode(eMove_right);
}
time_t prevDisplay = 0;
void loop() {
if( timeStatus() != timeNotSet ) {
if( now() != prevDisplay ) {
prevDisplay = now();
showtime();
}
}
}
void showtime() {
int Hour = hour();
int Min = minute();
int Sec = second();
//char TIME;
char HOUR;
char MIN;
char SEC;
itoa( Hour, HOUR, 10 );
itoa( Min, MIN, 10 );
itoa( Sec, SEC, 10 );
strcat( HOUR, ":" );
strcat( HOUR, MIN );
strcat( HOUR, ":" );
strcat( HOUR, SEC );
screen.setMessageList( 1, HOUR );
screen.displayBanner( "A" );
}
const int NTP_PACKET_SIZE = 48; // NTP time is in the first 48 bytes of message
byte packetBuffer; //buffer to hold incoming & outgoing packets
time_t getNtpTime()
{
IPAddress ntpServerIP; // NTP server's ip address
while( Udp.parsePacket() > 0 ) ; // discard any previously received packets
Serial.println( "Transmit NTP Request" );
// get a random server from the pool
WiFi.hostByName( ntpServerName, ntpServerIP );
Serial.print( ntpServerName );
Serial.print( ": " );
Serial.println( ntpServerIP );
sendNTPpacket( ntpServerIP );
uint32_t beginWait = millis();
while( millis() - beginWait < 1500 ) {
int size = Udp.parsePacket();
if( size >= NTP_PACKET_SIZE ) {
Serial.println( "Receive NTP Response" );
Udp.read( packetBuffer, NTP_PACKET_SIZE ); // read packet into the buffer
unsigned long secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = ( unsigned long )packetBuffer << 24;
secsSince1900 |= ( unsigned long )packetBuffer << 16;
secsSince1900 |= ( unsigned long )packetBuffer << 8;
secsSince1900 |= ( unsigned long )packetBuffer;
return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
}
}
Serial.println( "No NTP Response :-(" );
return 0; // return 0 if unable to get the time
}
// send an NTP request to the time server at the given address
void sendNTPpacket( IPAddress &address )
{
// set all bytes in the buffer to 0
memset( packetBuffer, 0, NTP_PACKET_SIZE );
// Initialize values needed to form NTP request
// (see URL above for details on the packets)
packetBuffer = 0b11100011; // LI, Version, Mode
packetBuffer = 0; // Stratum, or type of clock
packetBuffer = 6; // Polling Interval
packetBuffer = 0xEC;// Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer = 49;
packetBuffer = 0x4E;
packetBuffer = 49;
packetBuffer = 52;
// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
Udp.beginPacket( address, 123 ); //NTP requests are to port 123
Udp.write( packetBuffer, NTP_PACKET_SIZE );
Udp.endPacket();
}
遇到的问题和其他人一样，底层是直接写在51上的，正常秒跳动应该是两个“ ：”跳动的，但是现在只能整体刷新，效果非常的不理想。{:5_129:}
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