/**
* Function starts the SD card service and makes sure that the appropriate directory
* structure exists, then creates the file to use for logging data. Data will be logged
* to a file called fileNamePrefix_0.csv or fileNamePrefix_0.bin (number will be incremented
* for each new log file)
*
* @param chipSelectPin Arduino pin SD card reader CS pin is attached to
* @param fileNamePrefix string to prefix at beginning of data file
* @param csvData boolean flag whether we are writing csv data or binary data (used for filename)
*
* @return true if successful, false if failed
*/
bool beginDataLog(int chipSelectPin, const char *fileNamePrefix, bool csvData)
{
bool ret;
int i = 0;
int max_len;
char fileName[19];
char prefix[8];
char rootPath[] = "/data";
if (_output_buffer != NULL) {
delete []_output_buffer;
}
OUTPUT_BUF_SIZE = 512;
_output_buffer = vol.cacheAddress()->output_buf;
if (freeMemory() < 400) {
strcpy_P(_getOutBuf(), sd_card_error);
Serial.print(_getOutBuf());
Serial.print(freeMemory());
Serial.println(", need 400)");
ret = false;
} else {
ret = sd.begin(chipSelectPin, SPI_FULL_SPEED);
}
//Filenames need to fit the 8.3 filename convention, so truncate down the
//given filename if it is too long.
memcpy(prefix, fileNamePrefix, 7);
prefix[7] = '\0';
if (ret) {
if (!sd.exists(rootPath))
ret = sd.mkdir(rootPath);
if (ret) {
while (true) {
if (i < 10) {
max_len = 7;
} else if (i < 100) {
max_len = 6;
} else if (i < 1000) {
max_len = 5;
} else {
break;
}
prefix[max_len - 1] = '\0';
sprintf(fileName, "%s/%s%d.%s", rootPath, prefix, i,
csvData ? "csv" : "bin");
if (!sd.exists(fileName)) {
file = sd.open(fileName, FILE_WRITE);
break;
}
i++;
}
}
}
return file.isOpen();
}
boolean put_handler(AtMegaWebServer& web_server) {
const char* length_str = web_server.get_header_value("Content-Length");
long length = atol(length_str);
const char *path = web_server.get_path();
SdFile file;
if(!file.open(path, O_CREAT | O_WRITE | O_TRUNC)){
// maybe the folder must be created
char *c = strrchr(path, '/');
if(c){
*c = 0;
if(sdfat.mkdir(path)){
#if DEBUG
Serial << "put_handler make DIR: ok " << path <<'\n';
#endif
*c = '/';
if(!file.open(path, O_CREAT | O_WRITE | O_TRUNC)){
#if DEBUG
Serial << "put_handler open FILE: failed " << path <<'\n';
#endif
}
}
*c = '/';
}
}
if(file.isOpen()){
EthernetClient client = web_server.get_client();
long size = 0;
int read = 0;
while(size < length && web_server.waitClientAvailable()){
read = client.read((uint8_t*)buffer, sizeof(buffer));
file.write(buffer, read);
size += read;
}
file.close();
#if DEBUG
Serial << "file written: " << size << " of: " << length << '\n';
#endif
if(size < length){
web_server.sendHttpResult(404);
}else{
web_server.sendHttpResult(200);
web_server << path;
}
}else{
web_server.sendHttpResult(422); // assuming it's a bad filename (non 8.3 name)
#if DEBUG
Serial << F("put_handler open file failed: send 422 ") << path <<'\n';
#endif
}
return true;
}
//------------------------------------------------------------------------------
void setup() {
Serial.begin(9600);
// Wait for USB Serial
while (!Serial) {
SysCall::yield();
}
delay(1000);
cout << F("Type any character to start\n");
// Wait for input line and discard.
cin.readline();
cout << endl;
// Initialize the SD card at SPI_HALF_SPEED to avoid bus errors with
// breadboards. use SPI_FULL_SPEED for better performance.
if (!sd.begin(SD_CHIP_SELECT, SPI_HALF_SPEED)) {
sd.initErrorHalt();
}
if (sd.exists("Folder1")
|| sd.exists("Folder1/file1.txt")
|| sd.exists("Folder1/File2.txt")) {
error("Please remove existing Folder1, file1.txt, and File2.txt");
}
int rootFileCount = 0;
sd.vwd()->rewind();
while (file.openNext(sd.vwd(), O_READ)) {
if (!file.isHidden()) {
rootFileCount++;
}
file.close();
if (rootFileCount > 10) {
error("Too many files in root. Please use an empty SD.");
}
}
if (rootFileCount) {
cout << F("\nPlease use an empty SD for best results.\n\n");
delay(1000);
}
// Create a new folder.
if (!sd.mkdir("Folder1")) {
error("Create Folder1 failed");
}
cout << F("Created Folder1\n");
// Create a file in Folder1 using a path.
if (!file.open("Folder1/file1.txt", O_CREAT | O_WRITE)) {
error("create Folder1/file1.txt failed");
}
file.close();
cout << F("Created Folder1/file1.txt\n");
// Change volume working directory to Folder1.
if (!sd.chdir("Folder1")) {
error("chdir failed for Folder1.\n");
}
cout << F("chdir to Folder1\n");
// Create File2.txt in current directory.
if (!file.open("File2.txt", O_CREAT | O_WRITE)) {
error("create File2.txt failed");
}
file.close();
cout << F("Created File2.txt in current directory\n");
cout << F("\nList of files on the SD.\n");
sd.ls("/", LS_R);
// Remove files from current directory.
if (!sd.remove("file1.txt") || !sd.remove("File2.txt")) {
error("remove failed");
}
cout << F("\nfile1.txt and File2.txt removed.\n");
// Change current directory to root.
if (!sd.chdir()) {
error("chdir to root failed.\n");
}
cout << F("\nList of files on the SD.\n");
sd.ls(LS_R);
// Remove Folder1.
if (!sd.rmdir("Folder1")) {
error("rmdir for Folder1 failed\n");
}
cout << F("\nFolder1 removed.\n");
cout << F("\nList of files on the SD.\n");
sd.ls(LS_R);
cout << F("Done!\n");
}