I'm with a problem reading the Micro Sd through the Ethernet Shield, the first time it reads the file, but the second time he already failed, perhaps I'm using the keypad? or by using the library display 128x64 GLCD?
#include <glcd.h>
#include <fonts/allFonts.h>
#include <Keypad.h>
#include <SD.h>
//DECLARAÇÃO DO TECLADO
unsigned long startMillis;
unsigned int iter = 0;
unsigned int iterStart = 0;
const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns
char keys[ROWS][COLS] = {
{
'1','2','3','A' }
,
{
'4','5','6','B' }
,
{
'7','8','9','C' }
,
{
'*','0','#','D' }
};
byte rowPins[ROWS] = {
A12, A13, A14, A15}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {
A8, A9, A10,A11}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
char key = keypad.getKey();
char id[5];
int a=0;
const int chipSelect =4;
void setup() {
Serial.begin(9600);
pinMode(10, OUTPUT);
//INICIALIZAÇÃO DO DISPLAY
GLCD.Init(NON_INVERTED); // initialise the library
GLCD.ClearScreen(); //limpa lcd
GLCD.SelectFont(System5x7); // select fixed width system font
GLCD.SetTextMode(SCROLL_UP);
}
void loop(){
int i=0;
delay(150);
GLCD.ClearScreen();
GLCD.CursorTo(0,0);
GLCD.print("ID=");
//SE NÃO FOI DIGITADO NENHUM ID AINDA ID=0000
if (a == 0){ //A VARIAVEL FOR FALSA ELE JOGA O ID = 0000
for(i=0;i<5;i++){
id[i]=0;
}
}
while (i < 5 ){ //MOSTRA O ID
GLCD.CursorTo(i+4,0);
GLCD.print(id[i]);
i++;
}
GLCD.CursorTo(0,1);
GLCD.println("PRECIONE A FUNCAO DESEJADA");
GLCD.println("A=Identificação");
GLCD.println("B=Mensagens Diversas");
//MENU DE ESCOLHA
switch (key = keypad.getKey()){
case 'B':
Sd();
break;
}}
}
}
//**************--------------******************************---------------------------------------
void Sd(){
File myFile;
delay(110);
myFile = SD.open("test.txt", FILE_WRITE);
if (!SD.begin(4)) {
Serial.println("initialization failed!");
return;
}
Serial.println("initialization done.");
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open("test.txt", FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to test.txt...");
myFile.println("testing 1, 2, 3.");
// close the file:
myFile.close();
Serial.println("done.");
}
else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
delay(110);
// re-open the file for reading:
myFile = SD.open("test.txt");
if (myFile) {
Serial.println("test.txt:");
// read from the file until there's nothing else in it:
while (myFile.available()) {
Serial.write(myFile.read());
}
myFile.close();
}
else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
}
