I am building a data logger / web server for home power monitoring using the W5100/SD sheild and an Atmega2560.
I added the capability to list the files to the web client and now writing to the current day's file is failing.
I've cut the code down a bit to paste here (no ntp/date stuff). Probably a bit out of my depth here, not familiar with initializing a volume and defining a root file but I have a hunch that something in the setup has screwed up the file writing.
void setup() {
// Open serial communications
Serial.begin(9600);
// disable w5100 while starting SD
pinMode(10,OUTPUT);
digitalWrite(10,HIGH);
pinMode(AmpPin,INPUT);
// Serial.print(F("Starting SD..."));
// if(!sd.begin(chipSelect, SPI_HALF_SPEED)) Serial.println(F("failed"));
// else Serial.println(F("ok"));
PgmPrint("Free RAM: ");
Serial.println(FreeRam());
// initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
// breadboards. use SPI_FULL_SPEED for better performance.
pinMode(10, OUTPUT); // set the SS pin as an output (necessary!)
digitalWrite(10, HIGH); // but turn off the W5100 chip!
Serial.print(F("Starting SD..."));
if (!card.init(SPI_HALF_SPEED, chipSelect)) error("card.init failed!");
// initialize a FAT volume
if (!volume.init(&card)) error("vol.init failed!");
PgmPrint("Volume is FAT");
Serial.println(volume.fatType(),DEC);
Serial.println();
if (!root.openRoot(&volume)) error("openRoot failed");
// list file in root with date and size
PgmPrintln("Files found in root:");
root.ls(LS_DATE | LS_SIZE);
Serial.println();
// Recursive list of all directories
PgmPrintln("Files found in all dirs:");
root.ls(LS_R);
Serial.println();
PgmPrintln("Done");
// start Ethernet and UDP
Serial.print(F("Starting w5100..."));
if (Ethernet.begin(mac) == 0) {
Serial.println("Failed to configure Ethernet using DHCP");
// no point in carrying on, so do nothing forevermore:
for(;;)
;
}
--------------------------//--------------------------//--------------------------//
void saveFileRecord() { //creates the filename from the data string and opens/creates the file and saves a record in the file
char filename_Rec[9] = "000000.d";
int WattsWrite = watts; //truncate the float value watts to an integer
filename_Rec[0] = date[0];
filename_Rec[1] = date[1];
filename_Rec[2] = date[3];
filename_Rec[3] = date[4];
filename_Rec[4] = date[8];
filename_Rec[5] = date[9];
Serial.print("Current File: ");
Serial.println(filename_Rec);
if (!dataFile.open(filename_Rec, O_RDWR | O_CREAT | O_AT_END)) {
Serial.println("error writing file");
}
else{
Serial.println("Writing to file : ");
Serial.println(filename_Rec);
dataFile.print(WattsWrite);
dataFile.print(" ");
dataFile.print(KWH);
dataFile.print(" ");
dataFile.print(Hour); // hour stored in variable because of the MST conversion in GetNTPTime
dataFile.print(":");
dataFile.print((epoch % 3600) / 60); //mins
dataFile.print("\n"); //newline
Serial.println("\n");
dataFile.close();
Serial.println("done");
}
}
void ListFiles(EthernetClient client, uint8_t flags) {
// This code is just copied from SdFile.cpp in the SDFat library
// and tweaked to print to the client output in html!
dir_t p;
//root.seekSet(0);
Serial.println("Listing Files for client");
Serial.println(root.readDir(&p));
root.rewind();
client.println("<ul>");
while (root.readDir(&p) > 0) {
// done if past last used entry
if (p.name[0] == DIR_NAME_FREE) break;
// skip deleted entry and entries for . and ..
if (p.name[0] == DIR_NAME_DELETED || p.name[0] == '.') continue;
// only list subdirectories and files
if (!DIR_IS_FILE_OR_SUBDIR(&p)) continue;
// print any indent spaces
client.print("<li><a href=\"");
for (uint8_t i = 0; i < 11; i++) {
if (p.name[i] == ' ') continue;
if (i == 8) {
client.print('.');
}
client.print(p.name[i]);
}
client.print("\">");
// print file name with possible blank fill
for (uint8_t i = 0; i < 11; i++) {
if (p.name[i] == ' ') continue;
if (i == 8) {
client.print('.');
}
client.print(p.name[i]);
}
client.print("</a>");
if (DIR_IS_SUBDIR(&p)) {
client.print('/');
}
// print modify date/time if requested
if (flags & LS_DATE) {
root.printFatDate(p.lastWriteDate);
client.print(' ');
root.printFatTime(p.lastWriteTime);
}
// print size if requested
if (!DIR_IS_SUBDIR(&p) && (flags & LS_SIZE)) {
client.print(' ');
client.print(p.fileSize);
}
client.println("</li>");
}
client.println("</ul>");
}
void webClient()
#define BUFSIZ 100
{
char clientline[BUFSIZ];
int index = 0;
EthernetClient client = server.available();
if (client) {
// an http request ends with a blank line
boolean current_line_is_blank = true;
// reset the input buffer
index = 0;
while (client.connected()) {
if (client.available()) {
char c = client.read();
// If it isn't a new line, add the character to the buffer
if (c != '\n' && c != '\r') {
clientline[index] = c;
index++;
// are we too big for the buffer? start tossing out data
if (index >= BUFSIZ)
index = BUFSIZ -1;
// continue to read more data!
continue;
}
// got a \n or \r new line, which means the string is done
clientline[index] = 0;
// Print it out for debugging
Serial.println(clientline);
// Look for substring such as a request to get the root file
if (strstr(clientline, "GET / ") != 0) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
client.println(KWH);
client.print(" kwh ");
client.println(watts);
client.print("watts");
Serial.print(checkget);
// print all the files, use a helper to keep it clean
client.println("<h2>Files:</h2>");
ListFiles(client, LS_SIZE);
// debug - remove -----------------------------------------------------------------------------------------------------------------------------------------------
client.println("<a href=260616.d>");
client.print("260616.d");
client.print("</a>");
// debug - remove -----------------------------------------------------------------------------------------------------------------------------------------------
} else if (strstr(clientline, "GET /") != 0) {
// this time no space after the /, so a sub-file!
char *filename_web;
filename_web = clientline + 5; // look after the "GET /" (5 chars)
// a little trick, look for the " HTTP/1.1" string and
// turn the first character of the substring into a 0 to clear it out.
(strstr(clientline, " HTTP"))[0] = 0;
// print the file we want
Serial.println(filename_web);
if (! file.open(&root, filename_web, O_READ)) {
client.println("HTTP/1.1 404 Not Found");
client.println("Content-Type: text/html");
client.println();
client.println("<h2>File Not Found!</h2>");
break;
}
Serial.println("Opened!");
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/plain");
client.println();
int16_t c;
while ((c = file.read()) > 0) {
// uncomment the serial to debug (slow!)
//Serial.print((char)c);
client.print((char)c);
}
file.close();
} else {
// everything else is a 404
client.println("HTTP/1.1 404 Not Found");
client.println("Content-Type: text/html");
client.println();
client.println("<h2>File Not Found!</h2>");
}
break;
}
}
// give the web browser time to receive the data
delay(1);
client.stop();
}
}
