怎么把w5100从网络上获得的时间送给另一块Arduino
怎么把w5100从网络上获得的时间送给另一块Arduino ntp获取时间后，串口、I2C发给另一个arduino就可以啦 zhangyadong300 发表于 2016-4-12 09:34 static/image/common/back.gifntp获取时间后，串口、I2C发给另一个arduino就可以啦
无法获得ntp的信息，这是怎么回事。自定义的IP gateway subnet 代码贴上吧 zhangyadong300 发表于 2016-4-15 20:32 static/image/common/back.gif
代码贴上吧
#include <Time.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <SPI.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xE2 };
// NTP Servers:
IPAddress ip(10,0,49,243);
IPAddress gateway(10,0,49,254);
IPAddress subnet(255,255,255,128);
IPAddress timeServer(132,163,4,101); // time-a.timefreq.bldrdoc.gov
// IPAddress timeServer(132, 163, 4, 102); // time-b.timefreq.bldrdoc.gov
// IPAddress timeServer(132, 163, 4, 103); // time-c.timefreq.bldrdoc.gov
const int timeZone = +8; // Central European Time
//const int timeZone = -5;// Eastern Standard Time (USA)
//const int timeZone = -4;// Eastern Daylight Time (USA)
//const int timeZone = -8;// Pacific Standard Time (USA)
//const int timeZone = -7;// Pacific Daylight Time (USA)
EthernetUDP Udp;
unsigned int localPort = 8888;// local port to listen for UDP packets
void setup()
{
Serial.begin(9600);
while (!Serial) ; // Needed for Leonardo only
delay(250);
Serial.println("TimeNTP Example");
//if (Ethernet.begin(mac) == 0) {
// // no point in carrying on, so do nothing forevermore:
// while (1) {
// Serial.println("Failed to configure Ethernet using DHCP");
// delay(10000);
// }
//}
Ethernet.begin(mac,ip,gateway,subnet);
Serial.print("IP number assignedis ");
Serial.println(Ethernet.localIP());
Udp.begin(localPort);
Serial.println("waiting for sync");
setSyncProvider(getNtpTime);
}
time_t prevDisplay = 0; // when the digital clock was displayed
void loop()
{
if (timeStatus() != timeNotSet) {
if (now() != prevDisplay) { //update the display only if time has changed
prevDisplay = now();
digitalClockDisplay();
}
}
}
void digitalClockDisplay(){
// digital clock display of the time
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.print(" ");
Serial.print(day());
Serial.print(" ");
Serial.print(month());
Serial.print(" ");
Serial.print(year());
Serial.println();
}
void printDigits(int digits){
// utility for digital clock display: prints preceding colon and leading 0
Serial.print(":");
if(digits < 10)
Serial.print('0');
Serial.print(digits);
}
/*-------- NTP code ----------*/
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()
{
while (Udp.parsePacket() > 0) ; // discard any previously received packets
Serial.println("Transmit NTP Request");
sendNTPpacket(timeServer);
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();
}
zhangxiaoyang77 发表于 2016-4-18 09:47 static/image/common/back.gif
#include
#include
#include
不知道你上级路由怎么设置的，10,0,49,254是你路由器的地址么？
感觉一般家里都直接192.168.1.1了吧。是二级路由器么？
还有你的IPAddress subnet(255,255,255,128);
你把10,0,49,129-10,0,49,254分成一个子网是做什么？
你设置的ntp服务器我没ping通。试试time.nist.gov 的 128.138.141.172
zhangyadong300 发表于 2016-4-21 11:22 static/image/common/back.gif
不知道你上级路由怎么设置的，10,0,49,254是你路由器的地址么？
感觉一般家里都直接192.168.1.1了吧。是 ...
我用的公司内网，在家里做的实验室可以的，我用的这个地址是没有问题的。使用的time库函数。是不是内网配置有问题 zhangyadong300 发表于 2016-4-21 11:22 static/image/common/back.gif
不知道你上级路由怎么设置的，10,0,49,254是你路由器的地址么？
感觉一般家里都直接192.168.1.1了吧。是 ...
我用的公司内网，在家里做的实验室可以的，我用的这个地址是没有问题的。使用的time库函数。是不是内网配置有问题 不太清楚你们公司网络状况，不好硬答了 设置一下dns就可以了
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