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[submodule "arduino_core"]
path = arduino_core
url = https://egit.irs.uni-stuttgart.de/mohr/arduino_core.git

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arduino_core Submodule

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Subproject commit 2e1a21773763b2e17b24825f6f7f1e4015e0e9d8

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#include "DleEncoder.h"
DleEncoder::DleEncoder() {
}
DleEncoder::~DleEncoder() {
}
ReturnValue_t DleEncoder::decode(const uint8_t *sourceStream,
size_t sourceStreamLen, size_t *readLen, uint8_t *destStream,
size_t maxDestStreamlen, size_t *decodedLen) {
size_t encodedIndex = 0, decodedIndex = 0;
uint8_t nextByte;
if (*sourceStream != STX) {
return RETURN_FAILED;
}
++encodedIndex;
while ((encodedIndex < sourceStreamLen) && (decodedIndex < maxDestStreamlen)
&& (sourceStream[encodedIndex] != ETX)
&& (sourceStream[encodedIndex] != STX)) {
if (sourceStream[encodedIndex] == DLE) {
nextByte = sourceStream[encodedIndex + 1];
if (nextByte == 0x10) {
destStream[decodedIndex] = nextByte;
} else {
if ((nextByte == 0x42) || (nextByte == 0x43)
|| (nextByte == 0x4D)) {
destStream[decodedIndex] = nextByte - 0x40;
} else {
return RETURN_FAILED;
}
}
++encodedIndex;
} else {
destStream[decodedIndex] = sourceStream[encodedIndex];
}
++encodedIndex;
++decodedIndex;
}
if (sourceStream[encodedIndex] != ETX) {
return RETURN_FAILED;
} else {
*readLen = ++encodedIndex;
*decodedLen = decodedIndex;
return RETURN_OK;
}
}
ReturnValue_t DleEncoder::encode(const uint8_t* sourceStream,
size_t sourceLen, uint8_t* destStream, size_t maxDestLen,
size_t* encodedLen, bool addStxEtx) {
if (maxDestLen < 2) {
return RETURN_FAILED;
}
uint32_t encodedIndex = 0, sourceIndex = 0;
uint8_t nextByte;
if (addStxEtx) {
destStream[0] = STX;
++encodedIndex;
}
while ((encodedIndex < maxDestLen) && (sourceIndex < sourceLen)) {
nextByte = sourceStream[sourceIndex];
if ((nextByte == STX) || (nextByte == ETX) || (nextByte == 0x0D)) {
if (encodedIndex + 1 >= maxDestLen) {
return RETURN_FAILED;
} else {
destStream[encodedIndex] = DLE;
++encodedIndex;
destStream[encodedIndex] = nextByte + 0x40;
}
} else if (nextByte == DLE) {
if (encodedIndex + 1 >= maxDestLen) {
return RETURN_FAILED;
} else {
destStream[encodedIndex] = DLE;
++encodedIndex;
destStream[encodedIndex] = DLE;
}
} else {
destStream[encodedIndex] = nextByte;
}
++encodedIndex;
++sourceIndex;
}
if ((sourceIndex == sourceLen) && (encodedIndex < maxDestLen)) {
if (addStxEtx) {
destStream[encodedIndex] = ETX;
++encodedIndex;
}
*encodedLen = encodedIndex;
return RETURN_OK;
} else {
return RETURN_FAILED;
}
}

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#ifndef DLEENCODER_H_
#define DLEENCODER_H_
#include "HasReturnvaluesIF.h"
#include <stdlib.h>
class DleEncoder: public HasReturnvaluesIF {
private:
DleEncoder();
virtual ~DleEncoder();
public:
static const uint8_t STX = 0x02;
static const uint8_t ETX = 0x03;
static const uint8_t DLE = 0x10;
static ReturnValue_t decode(const uint8_t *sourceStream,
size_t sourceStreamLen, size_t *readLen, uint8_t *destStream,
size_t maxDestStreamlen, size_t *decodedLen);
static ReturnValue_t encode(const uint8_t *sourceStream, size_t sourceLen,
uint8_t *destStream, size_t maxDestLen, size_t *encodedLen,
bool addStxEtx = true);
};
#endif /* DLEENCODER_H_ */

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#ifndef HASRETURNVALUESIF_H_
#define HASRETURNVALUESIF_H_
#include <stdint.h>
#define MAKE_RETURN_CODE( number ) ((INTERFACE_ID << 8) + (number))
typedef uint16_t ReturnValue_t;
class HasReturnvaluesIF {
public:
static const ReturnValue_t RETURN_OK = 0;
static const ReturnValue_t RETURN_FAILED = 1;
virtual ~HasReturnvaluesIF() {
}
};
#endif /* HASRETURNVALUESIF_H_ */

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Apache License
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as of the date such litigation is filed.
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stating that You changed the files; and
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You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
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5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
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work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
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License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
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To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
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See the License for the specific language governing permissions and
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24
helper/NOTICE Normal file
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The classes in this folder are taken from the Flight Software Framework, hosted at
https://egit.irs.uni-stuttgart.de/fsfw/fsfw. Original NOTICE file below:
Flight Software Framework
The initial version of the Flight Software Framework was developed during
the Flying Laptop Project by the Universität Stuttgart in coorporation
with Airbus Defence and Space GmbH.
Copyrights in the Flight Software Framework are retained by their contributors.
No copyright assignment is required to contribute to the Flight Software Framework.
Some files include explicit copyright notices and/or license notices.
For full authorship information, see the version control history.
Except as otherwise noted (below and/or in individual files), the
Flight Software Framework is licensed under the Apache License, Version 2.0.
The Flight Software Framework includes modules written by third parties.
The following third party modules are included, and carry
their own copyright notices and license terms:
under contrib/:
* sgp4: sgp4 code developed by david vallado under public domain, see https://www.celestrak.com/publications/AIAA/2006-6753/

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#ifndef FRAMEWORK_CONTAINER_RINGBUFFERBASE_H_
#define FRAMEWORK_CONTAINER_RINGBUFFERBASE_H_
#include "HasReturnvaluesIF.h"
#include <stdlib.h>
template<uint8_t N_READ_PTRS = 1>
class RingBufferBase {
public:
RingBufferBase(size_t startAddress, size_t size, bool overwriteOld) :
start(startAddress), write(startAddress), size(size), overwriteOld(overwriteOld) {
for (uint8_t count = 0; count < N_READ_PTRS; count++) {
read[count] = startAddress;
}
}
ReturnValue_t readData(size_t amount, uint8_t n = 0) {
if (availableReadData(n) >= amount) {
incrementRead(amount, n);
return HasReturnvaluesIF::RETURN_OK;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
ReturnValue_t writeData(size_t amount) {
if (availableWriteSpace() >= amount || overwriteOld) {
incrementWrite(amount);
return HasReturnvaluesIF::RETURN_OK;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
size_t availableReadData(uint8_t n = 0) const {
return ((write + size) - read[n]) % size;
}
size_t availableWriteSpace(uint8_t n = 0) const {
//One less to avoid ambiguous full/empty problem.
return (((read[n] + size) - write - 1) % size);
}
bool isFull(uint8_t n = 0) {
return (availableWriteSpace(n) == 0);
}
bool isEmpty(uint8_t n = 0) {
return (availableReadData(n) == 0);
}
virtual ~RingBufferBase() {
}
size_t getRead(uint8_t n = 0) const {
return read[n];
}
void setRead(size_t read, uint8_t n = 0) {
if (read >= start && read < (start+size)) {
this->read[n] = read;
}
}
size_t getWrite() const {
return write;
}
void setWrite(size_t write) {
this->write = write;
}
void clear() {
write = start;
for (uint8_t count = 0; count < N_READ_PTRS; count++) {
read[count] = start;
}
}
size_t writeTillWrap() {
return (start + size) - write;
}
size_t readTillWrap(uint8_t n = 0) {
return (start + size) - read[n];
}
size_t getStart() const {
return start;
}
bool overwritesOld() const {
return overwriteOld;
}
size_t maxSize() const {
return size - 1;
}
protected:
const size_t start;
size_t write;
size_t read[N_READ_PTRS];
const size_t size;
const bool overwriteOld;
void incrementWrite(size_t amount) {
write = ((write + amount - start) % size) + start;
}
void incrementRead(size_t amount, uint8_t n = 0) {
read[n] = ((read[n] + amount - start) % size) + start;
}
};
#endif /* FRAMEWORK_CONTAINER_RINGBUFFERBASE_H_ */

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#include "SimpleRingBuffer.h"
#include <string.h>
SimpleRingBuffer::SimpleRingBuffer(size_t size, bool overwriteOld) :
RingBufferBase<>(0, size, overwriteOld), buffer(NULL) {
buffer = new uint8_t[size];
}
SimpleRingBuffer::~SimpleRingBuffer() {
delete[] buffer;
}
ReturnValue_t SimpleRingBuffer::writeData(const uint8_t* data,
size_t amount) {
if (availableWriteSpace() >= amount || overwriteOld) {
size_t amountTillWrap = writeTillWrap();
if (amountTillWrap >= amount) {
memcpy(&buffer[write], data, amount);
} else {
memcpy(&buffer[write], data, amountTillWrap);
memcpy(buffer, data + amountTillWrap, amount - amountTillWrap);
}
incrementWrite(amount);
return HasReturnvaluesIF::RETURN_OK;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
ReturnValue_t SimpleRingBuffer::readData(uint8_t* data, size_t amount,
bool readRemaining, size_t* trueAmount) {
size_t availableData = availableReadData(READ_PTR);
size_t amountTillWrap = readTillWrap(READ_PTR);
if (availableData < amount) {
if (readRemaining) {
amount = availableData;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
if (trueAmount != NULL) {
*trueAmount = amount;
}
if (amountTillWrap >= amount) {
memcpy(data, &buffer[read[READ_PTR]], amount);
} else {
memcpy(data, &buffer[read[READ_PTR]], amountTillWrap);
memcpy(data + amountTillWrap, buffer, amount - amountTillWrap);
}
return HasReturnvaluesIF::RETURN_OK;
}
ReturnValue_t SimpleRingBuffer::deleteData(size_t amount,
bool deleteRemaining, size_t* trueAmount) {
size_t availableData = availableReadData(READ_PTR);
if (availableData < amount) {
if (deleteRemaining) {
amount = availableData;
} else {
return HasReturnvaluesIF::RETURN_FAILED;
}
}
if (trueAmount != NULL) {
*trueAmount = amount;
}
incrementRead(amount, READ_PTR);
return HasReturnvaluesIF::RETURN_OK;
}

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#ifndef FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_
#define FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_
#include "RingBufferBase.h"
#include <stddef.h>
class SimpleRingBuffer: public RingBufferBase<> {
public:
SimpleRingBuffer(size_t size, bool overwriteOld);
virtual ~SimpleRingBuffer();
ReturnValue_t writeData(const uint8_t* data, size_t amount);
ReturnValue_t readData(uint8_t* data, size_t amount, bool readRemaining = false, size_t* trueAmount = NULL);
ReturnValue_t deleteData(size_t amount, bool deleteRemaining = false, size_t* trueAmount = NULL);
private:
// static const uint8_t TEMP_READ_PTR = 1;
static const uint8_t READ_PTR = 0;
uint8_t* buffer;
};
#endif /* FRAMEWORK_CONTAINER_SIMPLERINGBUFFER_H_ */

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#include "crc_ccitt.h"
#include <math.h>
static const uint16_t crc_table[256] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
// CRC implementation
uint16_t Calculate_CRC(uint8_t const input[], uint32_t length)
{
uint16_t crc = 0xFFFF;
uint8_t *data = (uint8_t *)input;
unsigned int tbl_idx;
while (length--) {
tbl_idx = ((crc >> 8) ^ *data) & 0xff;
crc = (crc_table[tbl_idx] ^ (crc << 8)) & 0xffff;
data++;
}
return crc & 0xffff;
//The part below is not used!
// bool temr[16];
// bool xor_out[16];
// bool r[16];
// bool d[8];
// uint16_t crc_value = 0;
//
//
// for (int i=0; i<16 ;i++) {
// temr[i] = false;
// xor_out[i] = false;
// }
//
//
// for (int i=0; i<16 ;i++)
// r[i] = true; // initialize with 0xFFFF
//
//
//
// for (int j=0; j<length ;j++)
// {
//
// for (int i=0; i<8 ;i++)
// if ((input[j] & 1<<i) == 1<<i)
// d[7-i]=true; // reverse input data
// else
// d[7-i]=false; // reverse input data
//
//
//
// temr[0] = d[4] ^ d[0];
// temr[1] = d[5] ^ d[1];
// temr[2] = d[6] ^ d[2];
// temr[3] = d[7] ^ d[3];
// temr[4] = r[12] ^ r[8];
// temr[5] = r[13] ^ r[9];
// temr[6] = r[14] ^ r[10];
// temr[7] = r[15] ^ r[11];
// temr[8] = d[4] ^ r[12];
// temr[9] = d[5] ^ r[13];
// temr[10] = d[6] ^ r[14];
// temr[11] = d[7] ^ r[15];
// temr[12] = temr[0] ^ temr[4];
// temr[13] = temr[1] ^ temr[5];
// temr[14] = temr[2] ^ temr[6];
// temr[15] = temr[3] ^ temr[7];
//
//
// xor_out[0] = temr[12];
// xor_out[1] = temr[13];
// xor_out[2] = temr[14];
// xor_out[3] = temr[15];
// xor_out[4] = temr[8];
// xor_out[5] = temr[9] ^ temr[12];
// xor_out[6] = temr[10] ^ temr[13];
// xor_out[7] = temr[11] ^ temr[14];
// xor_out[8] = temr[15] ^ r[0];
// xor_out[9] = temr[8] ^ r[1];
// xor_out[10] = temr[9] ^ r[2];
// xor_out[11] = temr[10] ^ r[3];
// xor_out[12] = temr[11] ^ temr[12] ^ r[4];
// xor_out[13] = temr[13] ^ r[5];
// xor_out[14] = temr[14] ^ r[6];
// xor_out[15] = temr[15] ^ r[7];
//
// for (int i=0; i<16 ;i++)
// {
// r[i]= xor_out[i] ;
// }
//
// }
//
//
//
// for (int i=0; i<16 ;i++)
// {
// if (xor_out[i] == true)
// crc_value = crc_value + pow(2,(15 -i)); // reverse CrC result before Final XOR
// }
//
// crc_value = 0;// for debug mode
// return (crc_value);
} /* Calculate_CRC() */

9
helper/crc_ccitt.h Normal file
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#ifndef CRC_CCITT_H_
#define CRC_CCITT_H_
#include <stdint.h>
uint16_t Calculate_CRC(uint8_t const input[], uint32_t length);
#endif /* CRC_H_ */

153
main.cpp Normal file
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#include <Arduino.h>
#include "helper/SimpleRingBuffer.h"
#include "helper/DleEncoder.h"
#include "helper/crc_ccitt.h"
//SPI is formally a library, so it is not part of the objects compiled
//from the core and we need to include it explicitly
#include "arduino_core/ArduinoCore-avr/libraries/SPI/src/SPI.h"
//Define which port to use for the SPI Chip Select
#define CS_PORT PORTC
#define CS_DDR DDRC
#define RING_BUFFER_SIZE 100
#define MAX_PACKET_LENGTH 20
static const uint8_t COMMAND_TRANSFER_SPI = 1;
SimpleRingBuffer ringBuffer(RING_BUFFER_SIZE, true);
uint8_t rawData[2 * RING_BUFFER_SIZE];
size_t rawDataSize = 0;
/**
* Encode and send the data, last two bytes of data are assumed to be for the checksum
* and will be overwritten with it
*/
void sendData(uint8_t *data, size_t len) {
uint16_t crc = Calculate_CRC(data,len-2);
data[len-2] = crc >> 8;
data[len-1] = crc;
//we're being conservative here
//TODO move this to global so other protocols can use it too
uint8_t buffer[2*len +2];
buffer[0] = DleEncoder::STX;
size_t writtenLen;
ReturnValue_t result = DleEncoder::encode(data,len,buffer,sizeof(buffer),&writtenLen, true);
if (result != HasReturnvaluesIF::RETURN_OK){
return;
}
Serial.write(buffer, writtenLen);
}
void transferSPI(uint8_t address, uint8_t *data, size_t datalen) {
SPI.beginTransaction(SPISettings(14000000, MSBFIRST, SPI_MODE0));
CS_PORT = ~address;
SPI.transfer(data,datalen);
delay(100);
CS_PORT = 0xff;
SPI.endTransaction();
}
void handlePacket(uint8_t *packet, size_t packetLen) {
//Paket layout is:
// 8 bit command | 8 bit address | 16bit length | <length> byte data | 16 bit crc
uint16_t crc = Calculate_CRC(packet, packetLen);
if (crc != 0) {
//Serial.println("invalid Checksum");
return;
}
uint16_t payloadLen = (packet[2] << 8) | packet[3];
if (payloadLen + 6 != packetLen) {
//Serial.println("invalid len");
return;
}
uint8_t command = packet[0];
uint8_t address = packet[1];
switch (command) {
case COMMAND_TRANSFER_SPI:
transferSPI(address, packet + 4, payloadLen);
//echo the data back, no need to change the header fields, they are the same
//checksum will be written by sendData()
sendData(packet,packetLen);
break;
default:
//Serial.println("invalid command");
break;
}
}
void handleNewData() {
ringBuffer.readData(rawData, sizeof(rawData), true, &rawDataSize);
if (rawDataSize == 0) {
return;
}
//look for STX
size_t firstSTXinRawData = 0;
while ((firstSTXinRawData < rawDataSize)
&& (rawData[firstSTXinRawData] != DleEncoder::STX)) {
firstSTXinRawData++;
}
if (rawData[firstSTXinRawData] != DleEncoder::STX) {
//there is no STX in our data, throw it away...
Serial.println(firstSTXinRawData);
ringBuffer.deleteData(rawDataSize);
return;
}
uint8_t packet[MAX_PACKET_LENGTH];
size_t packetLen;
size_t readSize;
ReturnValue_t result = DleEncoder::decode(rawData + firstSTXinRawData,
rawDataSize - firstSTXinRawData, &readSize, packet, sizeof(packet),
&packetLen);
size_t toDelete = firstSTXinRawData;
if (result == HasReturnvaluesIF::RETURN_OK) {
handlePacket(packet, packetLen);
//after handling the packet, we can delete it from the raw stream, it has been copied to packet
toDelete += readSize;
}
//remove Data which was processed
ringBuffer.deleteData(toDelete);
}
//TODO check if this is thread safe by arduino
void serialEvent() {
while (Serial.available()) {
uint8_t byte = Serial.read();
ringBuffer.writeData(&byte, 1);
}
}
void setup() {
CS_DDR = 0xff;
CS_PORT = 0xff;
Serial.begin(9600);
SPI.begin();
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
handleNewData();
delay(100);
}

5
makefile Normal file
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TARGET = ArduinoIO
SRC = # the C source files
PSRC = main.cpp $(wildcard helper/*.cpp) arduino_core/ArduinoCore-avr/libraries/SPI/src/SPI.cpp # the C++ source files
ARDLIBS = # extra Arduino libraries
include arduino_core/arduino-base.mk # this line includes the Makefile.base