diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d7433c8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+/nbproject/private/
+/build
+*.elf
+*.hex
+*.lst
+*.a
+*.d
+*.o
+*.map
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000..1ecc37c
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,128 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+ and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+ overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+ advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+ address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when
+an individual is officially representing the community in public spaces.
+Examples of representing our community include using an official e-mail address,
+posting via an official social media account, or acting as an appointed
+representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement at
+dode@luniks.net.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining
+the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed
+unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing
+clarity around the nature of the violation and an explanation of why the
+behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series
+of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No
+interaction with the people involved, including unsolicited interaction with
+those enforcing the Code of Conduct, for a specified period of time. This
+includes avoiding interactions in community spaces as well as external channels
+like social media. Violating these terms may lead to a temporary or
+permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including
+sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public
+communication with the community for a specified period of time. No public or
+private interaction with the people involved, including unsolicited interaction
+with those enforcing the Code of Conduct, is allowed during this period.
+Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community
+standards, including sustained inappropriate behavior, harassment of an
+individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within
+the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage],
+version 2.0, available at
+https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct
+enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at
+https://www.contributor-covenant.org/translations.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
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+
+ The licenses for most software and other practical works are designed
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+share and change all versions of a program--to make sure it remains free
+software for all its users. We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors. You can apply it to
+your programs, too.
+
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+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+ If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+ A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License. You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+ Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+ 12. No Surrender of Others' Freedom.
+
+ If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all. For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+ 13. Use with the GNU Affero General Public License.
+
+ Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+ 14. Revised Versions of this License.
+
+ The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+ Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+ If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+ Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+ 15. Disclaimer of Warranty.
+
+ THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+
+ Copyright (C)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see .
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ Copyright (C)
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..0583ea9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,42 @@
+# Makefile to build libsdc
+#
+# Simplified version from: https://github.com/hexagon5un/AVR-Programming
+
+MAIN = libsdc.c
+
+CC = avr-gcc
+AR = avr-ar
+
+CFLAGS += -O2 -I.
+CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -Wall -Wstrict-prototypes
+CFLAGS += -g -ggdb
+CFLAGS += -ffunction-sections -fdata-sections -Wl,--gc-sections -mrelax
+CFLAGS += -std=gnu99
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105523
+# CFLAGS += --param=min-pagesize=0
+CFLAGS += -c
+
+ARFLAGS = rcs
+
+TARGET = $(strip $(basename $(MAIN)))
+SRC += $(TARGET).c
+
+OBJ = $(SRC:.c=.o)
+OBJ = $(SRC:.S=.o)
+
+$(TARGET).o: libsdc.h Makefile
+
+all: $(TARGET).a
+
+%.a: %.o
+ $(AR) $(ARFLAGS) $(TARGET).a $(TARGET).o
+
+%.o: $(SRC)
+ $(CC) $(CFLAGS) $(SRC) --output $@
+
+clean:
+ rm -f $(TARGET).a $(TARGET).hex $(TARGET).obj \
+ $(TARGET).o $(TARGET).d $(TARGET).eep $(TARGET).lst \
+ $(TARGET).lss $(TARGET).sym $(TARGET).map $(TARGET)~ \
+ $(TARGET).eeprom
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..88588c9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,24 @@
+# libsdc
+
+## About
+
+Static avr-libc library providing basic support for SD cards.
+
+Tested with a few recent SD cards with 16/64 GB from SanDisk, Transcend and
+Samsung.
+
+## TODO
+
+- Write multiple blocks
+
+## Usage
+
+1. Include `libsdc.h` and `libsdc.a` in the project
+2. To make the library device and CPU frequency independent, the
+`_sdc*` functions in `libsdc.h` must be implemented in the application
+
+## Features
+
+- Read single block
+- Read multiple blocks
+- Write single block
diff --git a/libsdc.c b/libsdc.c
new file mode 100644
index 0000000..a8873ab
--- /dev/null
+++ b/libsdc.c
@@ -0,0 +1,371 @@
+/*
+ * File: libsdc.c
+ * Author: torsten.roemer@luniks.net
+ *
+ * Thanks to http://rjhcoding.com/avrc-sd-interface-1.php ff.
+ *
+ * Created on 25.03.2025, 20:29
+ */
+
+#include "libsdc.h"
+
+/**
+ * Transmits the given command, argument and CRC value.
+ *
+ * @param command
+ * @param argument
+ * @param crc
+ */
+static void command(uint8_t command, uint32_t argument, uint8_t crc) {
+ // 6-bit command, start bit is always 0, _sdcTxter bit is 1 (host command)
+ _sdcTx(command | 0x40);
+
+ _sdcTx(argument >> 24);
+ _sdcTx(argument >> 16);
+ _sdcTx(argument >> 8);
+ _sdcTx(argument);
+
+ // 7-bit crc, end bit is always 1
+ _sdcTx(crc | 0x01);
+}
+
+/**
+ * Reads an R1 response and returns it.
+ *
+ * @return R1
+ */
+static uint8_t readR1(void) {
+ uint8_t i = 0;
+ uint8_t response;
+
+ // poll up to 8 times for response
+ while ((response = _sdcTx(0xff)) == 0xff) {
+ i++;
+ if (i > 8) {
+ break;
+ }
+ }
+
+ return response;
+}
+
+/**
+ * Reads an R3/R7 response into the given array of 5 bytes.
+ *
+ * @param R3/R7
+ */
+static void readR3_7(uint8_t *response) {
+ // read R1
+ response[0] = readR1();
+
+ // stop reading if R1 indicates an error
+ if (response[0] > 0x01) {
+ return;
+ }
+
+ response[1] = _sdcTx(0xff);
+ response[2] = _sdcTx(0xff);
+ response[3] = _sdcTx(0xff);
+ response[4] = _sdcTx(0xff);
+}
+
+/**
+ * SPI selects the SD card with extra clocks before and after.
+ */
+static void select(void) {
+ _sdcTx(0xff);
+ _sdcSel();
+ _sdcTx(0xff);
+}
+
+/**
+ * SPI deselects the SD card with extra clocks before and after.
+ */
+static void deselect(void) {
+ _sdcTx(0xff);
+ _sdcDes();
+ _sdcTx(0xff);
+}
+
+/**
+ * Supplies ramp up time.
+ */
+static void powerOn(void) {
+ for (uint8_t i = 0; i < 10; i++) _sdcDelay10();
+ deselect();
+
+ // supply at least 74 clocks
+ for (uint8_t i = 0; i < 10; i++) {
+ _sdcTx(0xff);
+ }
+}
+
+/**
+ * Sends CMD0 to set idle SPI mode and returns the R1 response.
+ *
+ * @return R1
+ */
+static uint8_t sendIdle(void) {
+ select();
+
+ command(CMD0, CMD0_ARG, CMD0_CRC);
+ uint8_t response = readR1();
+
+ deselect();
+
+ return response;
+}
+
+/**
+ * Sends CMD8 to check version and voltage and reads the R7 response
+ * into the given array of 5 bytes.
+ *
+ * @param R7
+ */
+static void sendIfCond(uint8_t *response) {
+ select();
+
+ command(CMD8, CMD8_ARG, CMD8_CRC);
+ readR3_7(response);
+
+ deselect();
+}
+
+/**
+ * Sends CMD55 to tell that an app command is next and returns the R1 response.
+ *
+ * @return R1
+ */
+static uint8_t sendApp(void) {
+ select();
+
+ command(CMD55, CMD55_ARG, CMD55_CRC);
+ uint8_t response = readR1();
+
+ deselect();
+
+ return response;
+}
+
+/**
+ * Sends CMD58 to read the OCR register and reads the R3 response
+ * into the given array of 5 bytes.
+ *
+ * @param R3
+ */
+static void sendOCR(uint8_t *response) {
+ select();
+
+ command(CMD58, CMD58_ARG, CMD58_CRC);
+ readR3_7(response);
+
+ deselect();
+}
+
+/**
+ * Sends ACMD41 to start initialization and returns the R1 response.
+ *
+ * @return R1
+ */
+static uint8_t sendOpCond(void) {
+ select();
+
+ command(ACMD41, ACMD41_ARG, ACMD41_CRC);
+ uint8_t response = readR1();
+
+ deselect();
+
+ return response;
+}
+
+bool initSDCard(void) {
+ uint8_t response[5];
+
+ // power on
+ powerOn();
+
+ // CMD0 - go to idle state
+ response[0] = sendIdle();
+ if (response[0] != 0x01) {
+ // retry solves failure possibly caused by another component
+ // on the same SPI bus
+ response[0] = sendIdle();
+ }
+ if (response[0] != 0x01) {
+ // printString("SD card error 0\r\n");
+ return false;
+ }
+
+ // CMD8 - send interface condition
+ sendIfCond(response);
+ if (response[0] & (1 << SD_CMD_ILLEGAL)) {
+ // printString("SD card is V1.x or not SD card\r\n");
+ return false;
+ } else if (response[0] > 0x01) {
+ // printString("SD card error 8\r\n");
+ return false;
+ } else if (response[4] != 0xaa) {
+ // printString("SD card echo pattern mismatch\r\n");
+ return false;
+ }
+
+ // initialize to ready state
+ uint8_t attempts = 0;
+ do {
+ if (attempts > 100) {
+ // printString("SD card did not become ready\r\n");
+ return false;
+ }
+
+ // CMD55 - send app command
+ response[0] = sendApp();
+ if (response[0] < 0x02) {
+ // ACMD41 - start initialization
+ response[0] = sendOpCond();
+ }
+
+ _sdcDelay10();
+ attempts++;
+ } while (response[0] != SD_SUCCESS);
+
+ // CMD58 - send operation conditions register
+ sendOCR(response);
+ if (response[0] > 0x01) {
+ // printString("SD card error 58\r\n");
+ return false;
+ } else if (!(response[1] & 0x80)) {
+ // printString("SD card not ready\r\n");
+ return false;
+ }
+
+ // printString("SD card ready\r\n");
+
+ return true;
+}
+
+bool readSingleBlock(uint32_t address, uint8_t *block) {
+ select();
+
+ command(CMD17, address, CMD17_CRC);
+ uint8_t response = readR1();
+ uint8_t token = 0xff;
+ bool success = false;
+
+ if (response == SD_SUCCESS) {
+ // read command was successful, wait for start block token
+ for (uint16_t attempt = 0; attempt < SD_MAX_READ && token == 0xff; attempt++) {
+ token = _sdcTx(0xff);
+ }
+
+ if (token == SD_START_BLOCK) {
+ // start block token received, 512 data bytes follow
+ for (uint16_t i = 0; i < SD_BLOCK_SIZE; i++) {
+ block[i] = _sdcTx(0xff);
+ }
+
+ // 16-bit CRC (ignore for now)
+ _sdcTx(0xff);
+ _sdcTx(0xff);
+
+ success = true;
+ }
+ }
+
+ deselect();
+
+ return success;
+}
+
+bool readMultiBlock(uint32_t address, SDConsumer consume) {
+ select();
+
+ command(CMD18, address, CMD18_CRC);
+ uint8_t response = readR1();
+ bool success = false;
+ bool cont = false;
+ uint8_t block[SD_BLOCK_SIZE];
+
+ if (response == SD_SUCCESS) {
+ // read command was successful
+ do {
+ // wait for start block token
+ uint8_t token = 0xff;
+ for (uint16_t attempt = 0; attempt < SD_MAX_READ && token == 0xff; attempt++) {
+ token = _sdcTx(0xff);
+ }
+
+ if (token == SD_START_BLOCK) {
+ // start block token received, 512 data bytes follow
+ for (uint16_t i = 0; i < SD_BLOCK_SIZE; i++) {
+ block[i] = _sdcTx(0xff);
+ }
+
+ // 16-bit CRC (ignore for now)
+ _sdcTx(0xff);
+ _sdcTx(0xff);
+
+ cont = consume(block);
+ } else {
+ break;
+ }
+ } while (cont);
+
+ deselect();
+ select();
+
+ command(CMD12, CMD12_ARG, CMD12_CRC);
+ // stuff byte on CMD12?
+ _sdcTx(0xff);
+ response = readR1();
+
+ if (response == SD_SUCCESS) {
+ // wait for not busy
+ uint8_t busy = 0x00;
+ for (uint16_t attempt = 0; attempt < SD_MAX_READ && busy == 0x00; attempt++) {
+ busy = _sdcTx(0xff);
+ }
+ success = busy != 0x00;
+ }
+ }
+
+ deselect();
+
+ return success;
+}
+
+bool writeSingleBlock(uint32_t address, uint8_t *block) {
+ select();
+
+ command(CMD24, address, CMD24_CRC);
+ uint8_t response = readR1();
+ uint8_t token = 0xff;
+ bool success = false;
+
+ if (response == SD_SUCCESS) {
+ // write command was successful, send start block token
+ _sdcTx(SD_START_BLOCK);
+
+ // write 512 data bytes
+ for (uint16_t i = 0; i < SD_BLOCK_SIZE; i++) {
+ _sdcTx(block[i]);
+ }
+
+ // wait for data response
+ for (uint16_t attempt = 0; attempt < SD_MAX_WRITE && token == 0xff; attempt++) {
+ token = _sdcTx(0xff);
+ }
+
+ if ((token & 0x0f) == 0x05) {
+ // data was accepted, wait while busy programming data
+ for (uint16_t attempt = 0; attempt < SD_MAX_WRITE && token == 0x00; attempt++) {
+ token = _sdcTx(0xff);
+ }
+
+ success = true;
+ }
+ }
+
+ deselect();
+
+ return success;
+}
diff --git a/libsdc.h b/libsdc.h
new file mode 100644
index 0000000..b277fa2
--- /dev/null
+++ b/libsdc.h
@@ -0,0 +1,131 @@
+/*
+ * File: libsdc.h
+ * Author: torsten.roemer@luniks.net
+ *
+ * Created on 25.03.2025, 20:29
+ */
+
+#ifndef SDCARD_H
+#define SDCARD_H
+
+#include
+#include
+#include
+
+#define CMD0 0
+#define CMD0_ARG 0x00000000
+#define CMD0_CRC 0x94
+
+#define CMD8 8
+#define CMD8_ARG 0x0000001aa
+#define CMD8_CRC 0x86
+
+#define CMD12 12
+#define CMD12_ARG 0x00000000
+#define CMD12_CRC 0x60
+
+#define CMD17 17
+#define CMD17_CRC 0x00
+
+#define CMD18 18
+#define CMD18_CRC 0x00
+
+#define CMD24 24
+#define CMD24_CRC 0x00
+
+#define CMD55 55
+#define CMD55_ARG 0x00000000
+#define CMD55_CRC 0x64
+
+#define CMD58 58
+#define CMD58_ARG 0x00000000
+#define CMD58_CRC 0xfc
+
+#define ACMD41 41
+#define ACMD41_ARG 0x40000000
+#define ACMD41_CRC 0x76
+
+// TODO depends on SPI SCK frequency
+#define SD_MAX_READ 50000 // SPI clock ticks in 100 ms
+#define SD_MAX_WRITE 125000 // SPI clock ticks in 250 ms
+
+#define SD_BLOCK_SIZE 512
+
+#define SD_CMD_ILLEGAL 2
+
+#define SD_SUCCESS 0x00
+#define SD_START_BLOCK 0xfe
+
+/**
+ * Pointer to a function that takes an array of bytes
+ * and returns a boolean.
+ */
+typedef bool (*SDConsumer)(uint8_t*);
+
+/**
+ * F_CPU dependent delay of 10 milliseconds.
+ * _delay_ms(10);
+ *
+ * @param ms
+ */
+void _sdcDelay10(void);
+
+/**
+ * Selects the radio to talk to via SPI.
+ * PORTB &= ~(1 << PB1);
+ */
+void _sdcSel(void);
+
+/**
+ * Deselects the radio to talk to via SPI.
+ * PORTB |= (1 << PB1);
+ */
+void _sdcDes(void);
+
+/**
+ * SPI transmits/receives given data/returns it.
+ *
+ * @param data
+ * @return data
+ */
+uint8_t _sdcTx(uint8_t data);
+
+/**
+ * Initializes the SD Card and returns true on success, false otherwise.
+ *
+ * @return true on success, false otherwise
+ */
+bool initSDCard(void);
+
+/**
+ * Reads a single block of 512 bytes at the given address into
+ * the given buffer and returns true on success, false otherwise.
+ *
+ * @param address address in 512 byte units
+ * @param block 512 byte buffer
+ * @return success
+ */
+bool readSingleBlock(uint32_t address, uint8_t *block);
+
+/**
+ * Reads multiple blocks of 512 bytes starting at the given address
+ * and, for each block, passes the buffer to the given function.
+ * By returning false, the function can request to stop reading blocks.
+ *
+ * @param address
+ * @param consume
+ * @return success
+ */
+bool readMultiBlock(uint32_t address, SDConsumer consume);
+
+/**
+ * Writes a single block of 512 bytes starting at the given address
+ * from the given buffer and returns true on success, false otherwise.
+ *
+ * @param address address in 512 byte units
+ * @param block 512 byte buffer
+ * @return success
+ */
+bool writeSingleBlock(uint32_t address, uint8_t *block);
+
+#endif /* SDCARD_H */
diff --git a/nbproject/Makefile-Custom.mk b/nbproject/Makefile-Custom.mk
new file mode 100644
index 0000000..3128903
--- /dev/null
+++ b/nbproject/Makefile-Custom.mk
@@ -0,0 +1,77 @@
+#
+# Generated Makefile - do not edit!
+#
+# Edit the Makefile in the project folder instead (../Makefile). Each target
+# has a -pre and a -post target defined where you can add customized code.
+#
+# This makefile implements configuration specific macros and targets.
+
+
+# Environment
+MKDIR=mkdir
+CP=cp
+GREP=grep
+NM=nm
+CCADMIN=CCadmin
+RANLIB=ranlib
+CC=avr-gcc
+CCC=avr-g++
+CXX=avr-g++
+FC=gfortran
+AS=avr-as
+
+# Macros
+CND_PLATFORM=AVR-Linux
+CND_DLIB_EXT=so
+CND_CONF=Custom
+CND_DISTDIR=dist
+CND_BUILDDIR=build
+
+# Include project Makefile
+include /home/dode/dev/libsdc/Makefile
+
+# Object Directory
+OBJECTDIR=${CND_BUILDDIR}/${CND_CONF}/${CND_PLATFORM}
+
+# Object Files
+OBJECTFILES= \
+ ${OBJECTDIR}/_ext/5ac087e9/libsdc.o
+
+
+# C Compiler Flags
+CFLAGS=
+
+# CC Compiler Flags
+CCFLAGS=
+CXXFLAGS=
+
+# Fortran Compiler Flags
+FFLAGS=
+
+# Assembler Flags
+ASFLAGS=
+
+# Link Libraries and Options
+LDLIBSOPTIONS=
+
+# Build Targets
+.build-conf: ${BUILD_SUBPROJECTS}
+ "${MAKE}" -f nbproject/Makefile-${CND_CONF}.mk ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/libsdc
+
+${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/libsdc: ${OBJECTFILES}
+ ${MKDIR} -p ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}
+ ${LINK.c} -o ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/libsdc ${OBJECTFILES} ${LDLIBSOPTIONS}
+
+${OBJECTDIR}/_ext/5ac087e9/libsdc.o: /home/dode/dev/libsdc/libsdc.c
+ ${MKDIR} -p ${OBJECTDIR}/_ext/5ac087e9
+ $(COMPILE.c) -g -o ${OBJECTDIR}/_ext/5ac087e9/libsdc.o /home/dode/dev/libsdc/libsdc.c
+
+# Subprojects
+.build-subprojects:
+
+# Clean Targets
+.clean-conf: ${CLEAN_SUBPROJECTS}
+ ${RM} -r ${CND_BUILDDIR}/${CND_CONF}
+
+# Subprojects
+.clean-subprojects:
diff --git a/nbproject/Makefile-impl.mk b/nbproject/Makefile-impl.mk
new file mode 100644
index 0000000..47adc8e
--- /dev/null
+++ b/nbproject/Makefile-impl.mk
@@ -0,0 +1,133 @@
+#
+# Generated Makefile - do not edit!
+#
+# Edit the Makefile in the project folder instead (../Makefile). Each target
+# has a pre- and a post- target defined where you can add customization code.
+#
+# This makefile implements macros and targets common to all configurations.
+#
+# NOCDDL
+
+
+# Building and Cleaning subprojects are done by default, but can be controlled with the SUB
+# macro. If SUB=no, subprojects will not be built or cleaned. The following macro
+# statements set BUILD_SUB-CONF and CLEAN_SUB-CONF to .build-reqprojects-conf
+# and .clean-reqprojects-conf unless SUB has the value 'no'
+SUB_no=NO
+SUBPROJECTS=${SUB_${SUB}}
+BUILD_SUBPROJECTS_=.build-subprojects
+BUILD_SUBPROJECTS_NO=
+BUILD_SUBPROJECTS=${BUILD_SUBPROJECTS_${SUBPROJECTS}}
+CLEAN_SUBPROJECTS_=.clean-subprojects
+CLEAN_SUBPROJECTS_NO=
+CLEAN_SUBPROJECTS=${CLEAN_SUBPROJECTS_${SUBPROJECTS}}
+
+
+# Project Name
+PROJECTNAME=libsdc
+
+# Active Configuration
+DEFAULTCONF=Custom
+CONF=${DEFAULTCONF}
+
+# All Configurations
+ALLCONFS=Custom
+
+
+# build
+.build-impl: .build-pre .validate-impl .depcheck-impl
+ @#echo "=> Running $@... Configuration=$(CONF)"
+ "${MAKE}" -f nbproject/Makefile-${CONF}.mk QMAKE=${QMAKE} SUBPROJECTS=${SUBPROJECTS} .build-conf
+
+
+# clean
+.clean-impl: .clean-pre .validate-impl .depcheck-impl
+ @#echo "=> Running $@... Configuration=$(CONF)"
+ "${MAKE}" -f nbproject/Makefile-${CONF}.mk QMAKE=${QMAKE} SUBPROJECTS=${SUBPROJECTS} .clean-conf
+
+
+# clobber
+.clobber-impl: .clobber-pre .depcheck-impl
+ @#echo "=> Running $@..."
+ for CONF in ${ALLCONFS}; \
+ do \
+ "${MAKE}" -f nbproject/Makefile-$${CONF}.mk QMAKE=${QMAKE} SUBPROJECTS=${SUBPROJECTS} .clean-conf; \
+ done
+
+# all
+.all-impl: .all-pre .depcheck-impl
+ @#echo "=> Running $@..."
+ for CONF in ${ALLCONFS}; \
+ do \
+ "${MAKE}" -f nbproject/Makefile-$${CONF}.mk QMAKE=${QMAKE} SUBPROJECTS=${SUBPROJECTS} .build-conf; \
+ done
+
+# build tests
+.build-tests-impl: .build-impl .build-tests-pre
+ @#echo "=> Running $@... Configuration=$(CONF)"
+ "${MAKE}" -f nbproject/Makefile-${CONF}.mk SUBPROJECTS=${SUBPROJECTS} .build-tests-conf
+
+# run tests
+.test-impl: .build-tests-impl .test-pre
+ @#echo "=> Running $@... Configuration=$(CONF)"
+ "${MAKE}" -f nbproject/Makefile-${CONF}.mk SUBPROJECTS=${SUBPROJECTS} .test-conf
+
+# dependency checking support
+.depcheck-impl:
+ @echo "# This code depends on make tool being used" >.dep.inc
+ @if [ -n "${MAKE_VERSION}" ]; then \
+ echo "DEPFILES=\$$(wildcard \$$(addsuffix .d, \$${OBJECTFILES} \$${TESTOBJECTFILES}))" >>.dep.inc; \
+ echo "ifneq (\$${DEPFILES},)" >>.dep.inc; \
+ echo "include \$${DEPFILES}" >>.dep.inc; \
+ echo "endif" >>.dep.inc; \
+ else \
+ echo ".KEEP_STATE:" >>.dep.inc; \
+ echo ".KEEP_STATE_FILE:.make.state.\$${CONF}" >>.dep.inc; \
+ fi
+
+# configuration validation
+.validate-impl:
+ @if [ ! -f nbproject/Makefile-${CONF}.mk ]; \
+ then \
+ echo ""; \
+ echo "Error: can not find the makefile for configuration '${CONF}' in project ${PROJECTNAME}"; \
+ echo "See 'make help' for details."; \
+ echo "Current directory: " `pwd`; \
+ echo ""; \
+ fi
+ @if [ ! -f nbproject/Makefile-${CONF}.mk ]; \
+ then \
+ exit 1; \
+ fi
+
+
+# help
+.help-impl: .help-pre
+ @echo "This makefile supports the following configurations:"
+ @echo " ${ALLCONFS}"
+ @echo ""
+ @echo "and the following targets:"
+ @echo " build (default target)"
+ @echo " clean"
+ @echo " clobber"
+ @echo " all"
+ @echo " help"
+ @echo ""
+ @echo "Makefile Usage:"
+ @echo " make [CONF=] [SUB=no] build"
+ @echo " make [CONF=] [SUB=no] clean"
+ @echo " make [SUB=no] clobber"
+ @echo " make [SUB=no] all"
+ @echo " make help"
+ @echo ""
+ @echo "Target 'build' will build a specific configuration and, unless 'SUB=no',"
+ @echo " also build subprojects."
+ @echo "Target 'clean' will clean a specific configuration and, unless 'SUB=no',"
+ @echo " also clean subprojects."
+ @echo "Target 'clobber' will remove all built files from all configurations and,"
+ @echo " unless 'SUB=no', also from subprojects."
+ @echo "Target 'all' will will build all configurations and, unless 'SUB=no',"
+ @echo " also build subprojects."
+ @echo "Target 'help' prints this message."
+ @echo ""
+
diff --git a/nbproject/Makefile-variables.mk b/nbproject/Makefile-variables.mk
new file mode 100644
index 0000000..456caf2
--- /dev/null
+++ b/nbproject/Makefile-variables.mk
@@ -0,0 +1,27 @@
+#
+# Generated - do not edit!
+#
+# NOCDDL
+#
+CND_BASEDIR=`pwd`
+CND_BUILDDIR=build
+CND_DISTDIR=dist
+# Custom configuration
+CND_PLATFORM_Custom=AVR-Linux
+CND_ARTIFACT_DIR_Custom=dist/Custom/AVR-Linux
+CND_ARTIFACT_NAME_Custom=libsdc
+CND_ARTIFACT_PATH_Custom=dist/Custom/AVR-Linux/libsdc
+CND_PACKAGE_DIR_Custom=dist/Custom/AVR-Linux/package
+CND_PACKAGE_NAME_Custom=libsdc.tar
+CND_PACKAGE_PATH_Custom=dist/Custom/AVR-Linux/package/libsdc.tar
+#
+# include compiler specific variables
+#
+# dmake command
+ROOT:sh = test -f nbproject/private/Makefile-variables.mk || \
+ (mkdir -p nbproject/private && touch nbproject/private/Makefile-variables.mk)
+#
+# gmake command
+.PHONY: $(shell test -f nbproject/private/Makefile-variables.mk || (mkdir -p nbproject/private && touch nbproject/private/Makefile-variables.mk))
+#
+include nbproject/private/Makefile-variables.mk
diff --git a/nbproject/Package-Custom.bash b/nbproject/Package-Custom.bash
new file mode 100644
index 0000000..c9d35d5
--- /dev/null
+++ b/nbproject/Package-Custom.bash
@@ -0,0 +1,76 @@
+#!/bin/bash -x
+
+#
+# Generated - do not edit!
+#
+
+# Macros
+TOP=`pwd`
+CND_PLATFORM=AVR-Linux
+CND_CONF=Custom
+CND_DISTDIR=dist
+CND_BUILDDIR=build
+CND_DLIB_EXT=so
+NBTMPDIR=${CND_BUILDDIR}/${CND_CONF}/${CND_PLATFORM}/tmp-packaging
+TMPDIRNAME=tmp-packaging
+OUTPUT_PATH=${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/libsdc
+OUTPUT_BASENAME=libsdc
+PACKAGE_TOP_DIR=libsdc/
+
+# Functions
+function checkReturnCode
+{
+ rc=$?
+ if [ $rc != 0 ]
+ then
+ exit $rc
+ fi
+}
+function makeDirectory
+# $1 directory path
+# $2 permission (optional)
+{
+ mkdir -p "$1"
+ checkReturnCode
+ if [ "$2" != "" ]
+ then
+ chmod $2 "$1"
+ checkReturnCode
+ fi
+}
+function copyFileToTmpDir
+# $1 from-file path
+# $2 to-file path
+# $3 permission
+{
+ cp "$1" "$2"
+ checkReturnCode
+ if [ "$3" != "" ]
+ then
+ chmod $3 "$2"
+ checkReturnCode
+ fi
+}
+
+# Setup
+cd "${TOP}"
+mkdir -p ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/package
+rm -rf ${NBTMPDIR}
+mkdir -p ${NBTMPDIR}
+
+# Copy files and create directories and links
+cd "${TOP}"
+makeDirectory "${NBTMPDIR}/libsdc/bin"
+copyFileToTmpDir "${OUTPUT_PATH}" "${NBTMPDIR}/${PACKAGE_TOP_DIR}bin/${OUTPUT_BASENAME}" 0755
+
+
+# Generate tar file
+cd "${TOP}"
+rm -f ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/package/libsdc.tar
+cd ${NBTMPDIR}
+tar -vcf ../../../../${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/package/libsdc.tar *
+checkReturnCode
+
+# Cleanup
+cd "${TOP}"
+rm -rf ${NBTMPDIR}
diff --git a/nbproject/configurations.xml b/nbproject/configurations.xml
new file mode 100644
index 0000000..0f7a92f
--- /dev/null
+++ b/nbproject/configurations.xml
@@ -0,0 +1,33 @@
+
+
+
+
+ libsdc.c
+
+
+ /home/dode/dev/libsdc/Makefile
+ /home/dode/dev/libsdc/nbproject/private/launcher.properties
+
+
+ ^(nbproject)$
+
+ /home/dode/dev/libsdc
+
+ /home/dode/dev/libsdc/Makefile
+
+
+
+ AVR|GNU
+ false
+ false
+
+
+
+ -
+
+
+
+
diff --git a/nbproject/project.xml b/nbproject/project.xml
new file mode 100644
index 0000000..c7560c8
--- /dev/null
+++ b/nbproject/project.xml
@@ -0,0 +1,26 @@
+
+
+ org.netbeans.modules.cnd.makeproject
+
+
+ libsdc
+ c
+
+ h
+ UTF-8
+
+
+ /home/dode/dev/libsdc
+
+
+
+ Custom
+ 1
+
+
+
+ false
+
+
+
+