我使用通过I2C连接到16x2 LCD的Arduino Uno R3。还可以使用LiquidCrystal_I2C库打印到LCD。我最近更改了一堆我的代码，我的代码的这个新版本使我的Arduino在遇到void setup（）之外的lcd.print（）语句时立即重置。代码是一项正在进行的工作，所以请耐心使用任何意大利面条代码。这是：
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#include <SPI.h>
#include <Wire.h>
#include "Time.h"
#include "WiFly.h" //include the WiFly experimental library
#include "Credentials.h"
#define I2C_ADDR 0x27 // Define I2C Address where the PCF8574A is
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
char msg[320];
char * ptr = &msg[0];
int letterCount = 0;
int countdownFlag = 0;
int cstopFlag = 0;
int lpcount = 0;
void(* resetFunc)(void) = 0; //pointer to reset function @ address 0
long days, hrs, mins, sec, rem1, rem2;
long gametime, timediff, new_timediff, current_time;
int flag1 = 0;
int flag2 = 0;
int flag3 = 0;
int flag4 = 0;
int flag5 = 0;
int flag6 = 0;
int flag7 = 0;
char hmTeam[25];
char awTeam[25];
char dateTime[25];
WiFlyClient client("api.football-data.org", 80);
void setup(){
//Begin LCD
lcd.begin (16,2);
// Switch on the backlight
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.home (); // go home
lcd.print("Loading...");
//Begin WiFly and Serial
WiFly.begin();
Serial.begin(9600);
Serial.println("Serial begun :D");
current_time = WiFly.getTime();
Serial.print("connecting to server...");
if(client.connect()){
Serial.println("connected");
client.print("GET http://api.football-data.org/teams/61/fixtures/?timeFrame=n20");
Serial.print("GET http://api.football-data.org/teams/61/fixtures/?timeFrame=n20");
client.println(" HTTP/1.1");
Serial.println(" HTTP/1.1");
client.println("Host: api.football-data.org");
Serial.println("Host: api.football-data.org");
client.println("X-Auth-Token: 4f02cc524412487989ee61aed27503d5");
Serial.println("X-Auth-Token: 4f02cc524412487989ee61aed27503d5");
client.println("Connection: close");
Serial.println("Connection: close");
client.println();
} else{
Serial.println("connection failed");
}
}
void loop(){
if (client.available()) {
char c = client.read();
Serial.print(c);
if(flag4 == 1 && letterCount < 321){
recordMessage(c);
flag5 = 1;
}
if(c == '\n' && !client.available() && flag5 == 1){
char * ptr2; //declare a second pointer to change reference from start of msg string to start of "homeTeam" - i.e. "h"
int count = 0; //this is to count for hmTeam character array
int i;
for(i = 0; i < 321; i++){
if(*(ptr+i) == 'h' && *(ptr+i+4) == 'T' && *(ptr+i+7) == 'm'){ //once the sequence "h T m" is found, we know we have reached the word "homeTeam" in the string
ptr2 = ptr+i+11;
while(*ptr2 != '"'){
hmTeam[count] = *ptr2;
ptr2++;
count++;
}
}
count = 0;
if(*(ptr+i) == 'a' && *(ptr+i+3) == 'y' && *(ptr+i+4) == 'T' && *(ptr+i+7) == 'm'){
ptr2 = ptr+i+11;
while(*ptr2 != '"'){
awTeam[count] = *ptr2;
ptr2++;
count++;
}
}
count = 0;
if(*(ptr+i) == 'd' && *(ptr+i+2) == 't' && *(ptr+i+3) == 'e'){
ptr2 = ptr+i+7;
while(*ptr2 != '"'){
dateTime[count] = *ptr2;
ptr2++;
count++;
}
}
}
}
if(c == '{'){
flag1 = 1;
}
if(flag1 == 1){
if(c == '"'){
flag2 = 1;
}
}
if(flag2 == 1){
if(c == '_'){
flag3 = 1;
}
}
if(flag3 == 1){
if(c == 'l'){
flag4 = 1;
}
}
}
if(!client.connected() && cstopFlag == 0){
delay(100);
client.flush();
client.stop();
Serial.println();
Serial.println("Disconnected.");
delay(500);
Serial.println();
cstopFlag = 1;
flag7 = 1;
}
if(flag7 == 1){
checkAction();
countdownFlag = 1;
}
if(countdownFlag == 1){
//lcd.setCursor(0,0);
//lcd.setBacklight(LOW);
//teamNamePrint(hmTeam);
//lcd.print(" vs ");
//teamNamePrint(awTeam);
countdown();
}
}
void recordMessage(char message){
msg[letterCount] = message;
letterCount++;
}
/*
void teamNamePrint(){
char team[25];
strcpy(team,hmTeam);
if(team == "Arsenal FC")
lcd.print("Arsenal");
else if (team == "Aston Villa FC")
lcd.print("AVFC");
else if (team =="Burnley FC")
lcd.print("Burnley");
else if (team =="Chelsea FC")
lcd.print("Chelsea");
else if (team =="Crystal Palace FC")
lcd.print("CPFC");
else if (team =="Everton FC")
lcd.print("Everton");
else if (team =="Hull City")
lcd.print("Hull");
else if (team =="Leiceter City FC")
lcd.print("Lcity");
else if (team =="Liverpool FC")
lcd.print("Lpool");
else if (team =="Manchester City FC")
lcd.print("ManCity");
else if (team =="Manchester United")
lcd.print("ManU");
else if (team =="Newcastle FC")
lcd.print("NCFC");
else if (team =="Queens Park Rangers")
lcd.print("QPR");
else if (team =="FC Southampton")
lcd.print("Sthtn");
else if (team =="Stoke FC")
lcd.print("Stoke");
else if (team =="Sunderland FC")
lcd.print("Sndlnd");
else if (team =="Swansea FC")
lcd.print("SwnFC");
else if (team =="Tottenham Hotspur")
lcd.print("Spurs");
else if (team =="West Bromwich Albion")
lcd.print("WBrom");
else if (team =="West Ham Utd")
lcd.print("WHU");
}
*/
void checkAction(){
if(lpcount < 60){
gametime_calc();
timediff = gametime - current_time;
days = timediff / 86400;
rem1 = timediff % 86400;
hrs = rem1 / 3600;
rem2 = rem1 % 3600;
mins = rem2 / 60;
sec = rem2 % 60;
} else if(lpcount == 60){
lpcount = 0;
current_time = WiFly.getTime();
new_timediff = gametime - current_time;
if((new_timediff - timediff) != 0){
lcd.setBacklight(HIGH);
lcd.clear();
lcd.print("Resetting...");
delay(1500);
days = new_timediff / 86400;
rem1 = new_timediff % 86400;
hrs = rem1 / 3600;
rem2 = rem1 % 3600;
mins = rem2 / 60;
sec = rem2 % 60;
lcd.clear();
}
}
}
void countdown(){
lcd.setCursor(0,1);
lcd_print(days,0); //print days
lcd_print(hrs,3); //print hours
lcd_print(mins,6); //print minutes
lcd_print(sec,9); //print seconds
if(sec == 0 && mins == 0 && hrs == 0 && days == 0){
lcd.setBacklight(HIGH);
lcd.setCursor(0,0);
lcd.print("Game begins now!");
lcd.setCursor(0,1);
lcd.print(" ");
delay(30000);
resetFunc(); //call reset
} else if(sec == 0 && mins != 0){
mins--;
lpcount++;
sec = 60;
} else if(sec == 0 && mins == 0 && hrs != 0){
hrs--;
mins = 59;
sec = 60;
} else if(sec == 0 && mins == 0 && hrs == 0 && days != 0){
days--;
hrs = 23;
mins = 59;
sec = 60;
}
if(lpcount == 60){
checkAction();
lcd.setCursor(0,1);
lcd_print(days,0); //print days
lcd_print(hrs,3); //print hours
lcd_print(mins,6); //print minutes
lcd_print(sec,9); //print seconds
}
delay(1000);
sec--;
}
void lcd_print(long period, int col){
if(period < 10){
lcd.setCursor(col,1);
lcd.print("0");
lcd.setCursor(col+1,1);
lcd.print(period);
} else{
lcd.print(period);
}
if(col != 9){
lcd.print(":");
}
}
void gametime_calc(){
TimeElements tm; //create a TimeElements variable
//for conversion to time_t variable
//Fill in the elements of tm with those from the msg array
tm.Second = (dateTime[17] - '0')*10 + (dateTime[18] - '0');
tm.Minute = (dateTime[14] - '0')*10 + (dateTime[15] - '0');
tm.Hour = (dateTime[11] - '0')*10 + (dateTime[12] - '0');
tm.Day = (dateTime[8] - '0')*10 + (dateTime[9] - '0');
tm.Month = (dateTime[5] - '0')*10 + (dateTime[6] - '0');
tm.Year = ((dateTime[0] - '0')*1000 + (dateTime[1] - '0')*100 + (dateTime[2] - '0')*10 + (dateTime[3] - '0')) - 1970;
gametime = makeTime(tm); //game time as time_t variable
}
可能导致此问题的原因是什么？可能是硬件？