330 lines
11 KiB
C++
330 lines
11 KiB
C++
/* Arduino SdFat Library
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* Copyright (C) 2009 by William Greiman
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*
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* This file is part of the Arduino SdFat Library
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Arduino SdFat Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include "SdFat.h"
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#include "SdFatUtil.h"
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//------------------------------------------------------------------------------
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/** Change a volume's working directory to root
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*
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* Changes the volume's working directory to the SD's root directory.
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* Optionally set the current working directory to the volume's
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* working directory.
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*
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* \param[in] set_cwd Set the current working directory to this volume's
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* working directory if true.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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bool SdFat::chdir(bool set_cwd) {
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if (set_cwd) SdBaseFile::cwd_ = &vwd_;
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vwd_.close();
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return vwd_.openRoot(&vol_);
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}
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//------------------------------------------------------------------------------
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/** Change a volume's working directory
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*
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* Changes the volume working directory to the \a path subdirectory.
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* Optionally set the current working directory to the volume's
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* working directory.
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*
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* Example: If the volume's working directory is "/DIR", chdir("SUB")
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* will change the volume's working directory from "/DIR" to "/DIR/SUB".
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*
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* If path is "/", the volume's working directory will be changed to the
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* root directory
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*
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* \param[in] path The name of the subdirectory.
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*
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* \param[in] set_cwd Set the current working directory to this volume's
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* working directory if true.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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bool SdFat::chdir(const char *path, bool set_cwd) {
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SdBaseFile dir;
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if (path[0] == '/' && path[1] == '\0') return chdir(set_cwd);
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if (!dir.open(&vwd_, path, O_READ)) goto fail;
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if (!dir.isDir()) goto fail;
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vwd_ = dir;
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if (set_cwd) SdBaseFile::cwd_ = &vwd_;
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return true;
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fail:
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return false;
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}
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//------------------------------------------------------------------------------
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/** Set the current working directory to a volume's working directory.
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*
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* This is useful with multiple SD cards.
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*
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* The current working directory is changed to this volume's working directory.
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*
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* This is like the Windows/DOS \<drive letter>: command.
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*/
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void SdFat::chvol() {
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SdBaseFile::cwd_ = &vwd_;
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}
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//------------------------------------------------------------------------------
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/** %Print any SD error code and halt. */
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void SdFat::errorHalt() {
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errorPrint();
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while (1);
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}
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//------------------------------------------------------------------------------
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/** %Print msg, any SD error code, and halt.
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*
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* \param[in] msg Message to print.
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*/
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void SdFat::errorHalt(char const* msg) {
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errorPrint(msg);
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while (1);
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}
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//------------------------------------------------------------------------------
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/** %Print msg, any SD error code, and halt.
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*
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* \param[in] msg Message in program space (flash memory) to print.
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*/
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void SdFat::errorHalt_P(PGM_P msg) {
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errorPrint_P(msg);
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while (1);
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}
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//------------------------------------------------------------------------------
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/** %Print any SD error code. */
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void SdFat::errorPrint() {
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if (!card_.errorCode()) return;
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PgmPrint("SD errorCode: 0X");
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Serial.println(card_.errorCode(), HEX);
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}
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//------------------------------------------------------------------------------
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/** %Print msg, any SD error code.
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*
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* \param[in] msg Message to print.
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*/
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void SdFat::errorPrint(char const* msg) {
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PgmPrint("error: ");
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Serial.println(msg);
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errorPrint();
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}
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//------------------------------------------------------------------------------
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/** %Print msg, any SD error code.
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*
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* \param[in] msg Message in program space (flash memory) to print.
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*/
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void SdFat::errorPrint_P(PGM_P msg) {
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PgmPrint("error: ");
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SerialPrintln_P(msg);
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errorPrint();
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}
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//------------------------------------------------------------------------------
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/**
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* Test for the existence of a file.
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*
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* \param[in] name Name of the file to be tested for.
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*
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* \return true if the file exists else false.
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*/
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bool SdFat::exists(const char* name) {
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return vwd_.exists(name);
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}
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//------------------------------------------------------------------------------
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/**
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* Initialize an SdFat object.
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*
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* Initializes the SD card, SD volume, and root directory.
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*
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* \param[in] sckRateID value for SPI SCK rate. See Sd2Card::init().
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* \param[in] chipSelectPin SD chip select pin. See Sd2Card::init().
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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bool SdFat::init(uint8_t sckRateID, uint8_t chipSelectPin) {
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return card_.init(sckRateID, chipSelectPin) && vol_.init(&card_) && chdir(1);
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}
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//------------------------------------------------------------------------------
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/** %Print error details and halt after SdFat::init() fails. */
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void SdFat::initErrorHalt() {
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initErrorPrint();
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while (1);
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}
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//------------------------------------------------------------------------------
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/**Print message, error details, and halt after SdFat::init() fails.
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*
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* \param[in] msg Message to print.
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*/
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void SdFat::initErrorHalt(char const *msg) {
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Serial.println(msg);
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initErrorHalt();
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}
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//------------------------------------------------------------------------------
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/**Print message, error details, and halt after SdFat::init() fails.
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*
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* \param[in] msg Message in program space (flash memory) to print.
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*/
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void SdFat::initErrorHalt_P(PGM_P msg) {
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SerialPrintln_P(msg);
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initErrorHalt();
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}
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//------------------------------------------------------------------------------
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/** Print error details after SdFat::init() fails. */
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void SdFat::initErrorPrint() {
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if (card_.errorCode()) {
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PgmPrintln("Can't access SD card. Do not reformat.");
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if (card_.errorCode() == SD_CARD_ERROR_CMD0) {
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PgmPrintln("No card, wrong chip select pin, or SPI problem?");
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}
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errorPrint();
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} else if (vol_.fatType() == 0) {
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PgmPrintln("Invalid format, reformat SD.");
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} else if (!vwd_.isOpen()) {
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PgmPrintln("Can't open root directory.");
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} else {
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PgmPrintln("No error found.");
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}
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}
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//------------------------------------------------------------------------------
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/**Print message and error details and halt after SdFat::init() fails.
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*
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* \param[in] msg Message to print.
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*/
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void SdFat::initErrorPrint(char const *msg) {
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Serial.println(msg);
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initErrorPrint();
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}
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//------------------------------------------------------------------------------
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/**Print message and error details after SdFat::init() fails.
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*
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* \param[in] msg Message in program space (flash memory) to print.
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*/
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void SdFat::initErrorPrint_P(PGM_P msg) {
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SerialPrintln_P(msg);
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initErrorHalt();
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}
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//------------------------------------------------------------------------------
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/** List the directory contents of the volume working directory to Serial.
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*
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* \param[in] flags The inclusive OR of
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*
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* LS_DATE - %Print file modification date
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*
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* LS_SIZE - %Print file size.
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*
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* LS_R - Recursive list of subdirectories.
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*/
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void SdFat::ls(uint8_t flags) {
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vwd_.ls(&Serial, flags);
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}
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//------------------------------------------------------------------------------
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/** List the directory contents of the volume working directory to Serial.
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*
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* \param[in] pr Print stream for list.
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*
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* \param[in] flags The inclusive OR of
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*
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* LS_DATE - %Print file modification date
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*
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* LS_SIZE - %Print file size.
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*
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* LS_R - Recursive list of subdirectories.
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*/
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void SdFat::ls(Print* pr, uint8_t flags) {
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vwd_.ls(pr, flags);
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}
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//------------------------------------------------------------------------------
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/** Make a subdirectory in the volume working directory.
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*
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* \param[in] path A path with a valid 8.3 DOS name for the subdirectory.
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*
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* \param[in] pFlag Create missing parent directories if true.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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bool SdFat::mkdir(const char* path, bool pFlag) {
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SdBaseFile sub;
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return sub.mkdir(&vwd_, path, pFlag);
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}
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//------------------------------------------------------------------------------
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/** Remove a file from the volume working directory.
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*
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* \param[in] path A path with a valid 8.3 DOS name for the file.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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bool SdFat::remove(const char* path) {
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return SdBaseFile::remove(&vwd_, path);
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}
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//------------------------------------------------------------------------------
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/** Rename a file or subdirectory.
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*
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* \param[in] oldPath Path name to the file or subdirectory to be renamed.
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*
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* \param[in] newPath New path name of the file or subdirectory.
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*
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* The \a newPath object must not exist before the rename call.
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*
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* The file to be renamed must not be open. The directory entry may be
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* moved and file system corruption could occur if the file is accessed by
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* a file object that was opened before the rename() call.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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bool SdFat::rename(const char *oldPath, const char *newPath) {
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SdBaseFile file;
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if (!file.open(oldPath, O_READ)) return false;
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return file.rename(&vwd_, newPath);
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}
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//------------------------------------------------------------------------------
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/** Remove a subdirectory from the volume's working directory.
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*
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* \param[in] path A path with a valid 8.3 DOS name for the subdirectory.
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*
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* The subdirectory file will be removed only if it is empty.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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*/
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bool SdFat::rmdir(const char* path) {
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SdBaseFile sub;
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if (!sub.open(path, O_READ)) return false;
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return sub.rmdir();
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}
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//------------------------------------------------------------------------------
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/** Truncate a file to a specified length. The current file position
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* will be maintained if it is less than or equal to \a length otherwise
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* it will be set to end of file.
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*
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* \param[in] path A path with a valid 8.3 DOS name for the file.
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* \param[in] length The desired length for the file.
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*
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* \return The value one, true, is returned for success and
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* the value zero, false, is returned for failure.
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* Reasons for failure include file is read only, file is a directory,
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* \a length is greater than the current file size or an I/O error occurs.
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*/
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bool SdFat::truncate(const char* path, uint32_t length) {
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SdBaseFile file;
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if (!file.open(path, O_WRITE)) return false;
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return file.truncate(length);
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}
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