uint8_t RF24BLE::recvPacket(uint8_t *input, uint8_t length,uint8_t channel ){
unsigned long time = millis();
while (_radio.available()<=0 && (millis()-time)<RECV_TIMEOUT){delay(1);}
if (_radio.available()>0){
_radio.read(input, length);
}
else { return RF24BLE_TIMEOUT; }
uint8_t i, dataLen = length - 3;
#if DEBUG == 1
// Packet length includes crc of 3 bytes
for (i = 0; i < length; i++){ Serial.print((char)input[i]); }
Serial.println();
#endif
//reversing the bits of the complete packet
for (i = 0; i < length; i++){ input[i] = reverseBits(input[i]); }
//de-whiten the packet using the same polynomial
bleWhiten(input, length, bleWhitenStart(RF24BLE::chLe[channel]));
//reversing bits of the crc
for (i = 0; i < 3; i++, dataLen++){ input[dataLen] = reverseBits(input[dataLen]); }
#if DEBUG == 1
for (i = 0; i < length; i++){ Serial.print((char)input[i]); }
Serial.println();
#endif
return checkCRC(input, length);
}
int main()
{
unsigned char c = 0x23;
printf("%x %x\n", c, reverseBytes(c));
unsigned int val = 0xdeadbeef;
printf("%x %x\n", val, reverseBits(val));
val = 1;
printf("%x %x\n", val, reverseBits(val));
}
void main(void)
{
uint32_t i = reverseBits(2147483649);
i = reverseBits(32768);
i = reverseBits(43261596);
bool palindrome = isPalindrome(-2147447412);
palindrome = isPalindrome(2112);
palindrome = isPalindrome(2147447412);
}
void RF24BLE::blePacketEncode(uint8_t* packet, uint8_t len, uint8_t chan){
// Assemble the packet to be transmitted
// Packet length includes pre-populated crc
uint8_t i, dataLen = len - 3;
BLEcrc(packet, dataLen, packet + dataLen);
for (i = 0; i < 3; i++, dataLen++)
packet[dataLen] = reverseBits(packet[dataLen]);
bleWhiten(packet, len, bleWhitenStart(chan));
for (i = 0; i < len; i++)
packet[i] = reverseBits(packet[i]); // the byte order of the packet should be reversed as well
}
int main(){
// allocate buffer size for input
char buf[MAX_BUFFER_SIZE];
CyGlobalIntEnable; /* Enable global interrupts */
// start UART
UART_1_Start();
// print line
strcpy(buf, "Established Communication \n \r");
UART_1_UartPutString(buf);
uint v4 = 0x56; // hex representation of the integer
uint vv4 = reverseBits(v4);
// print result
// integer to string to be printed
sprintf(buf, "%X", vv4);
strcat(buf, "\n \r");
UART_1_UartPutString(buf);
for(;;){}
}
inline int FastFourierTransform::fastReverseBits(int i, int NumBits)
{
if (NumBits <= MaxFastBits)
return gFFTBitTable[NumBits - 1][i];
else
return reverseBits(i, NumBits);
}
/*
* ======== taskLoad ========
*/
Void task(UArg arg1, UArg arg2)
{
UInt count = 1;
Int status = Ipc_S_SUCCESS;
UInt16 remoteProcId = MultiProc_getId("HOST");
do {
status = Ipc_attach(remoteProcId);
} while (status < 0);
Notify_registerEvent(remoteProcId, 0, SHUTDOWN,
(Notify_FnNotifyCbck)notifyCallbackFxn, 0);
while (shutdownFlag == FALSE) {
Semaphore_pend(sem, BIOS_WAIT_FOREVER);
/* Benchmark how long it takes to flip all the bits */
Log_write1(UIABenchmark_start, (xdc_IArg)"Reverse");
reverseBits(buffer, sizeof(buffer));
Log_write1(UIABenchmark_stop, (xdc_IArg)"Reverse");
Log_print1(Diags_USER1, "count = %d", count++);
}
/* Start shutdown process */
Notify_unregisterEvent(remoteProcId, 0, SHUTDOWN,
(Notify_FnNotifyCbck)notifyCallbackFxn, 0);
do {
status = Ipc_detach(remoteProcId);
} while (status < 0);
Ipc_stop();
}
void RF24BLE::transmitBegin(){
_radio.disableCRC();
_radio.powerUp();
_radio.setAutoAck(false);
_radio.stopListening();
_radio.setAddressWidth(4);
_radio.setRetries(0, 0);
_radio.setDataRate(RF24_1MBPS);
_radio.setPALevel(RF24_PA_MAX);
// Set access addresses (TX address in nRF24L01) to BLE advertising 0x8E89BED6
// Both bit and byte orders are reversed for BLE packet format
unsigned long address;
address = reverseBits(0xD6);
address <<= BYTELEN;
address |= reverseBits(0xBE);
address <<= BYTELEN;
address |= reverseBits(0x89);
address <<= BYTELEN;
address |= reverseBits(0x8E);
_radio.openWritingPipe(address);
}
/* Driver function to test above function */
int main()
{
unsigned int x = 0xf0000000;
char ch, *chp, **chpp, ***chppp, ****chpppp;
printf("Size of int is %ld\n", sizeof(x));
printf("%x\n", reverseBits(x));
chp = &ch;
chpp = &chp;
chppp = &chpp;
chpppp = &chppp;
foo (chp, chpp, chpp, chppp);
arr_size();
test_operator();
return 1;
}
int main (void) {
unsigned ui;
printf("\n%s%u%s","Please enter an unsigned integer "
"(whole number between 0 and ", ULONG_MAX, "):\n\n");
scanf("%u", &ui);
displayBits(ui);
printf("\n\n%s%u%s", "The result of reversing ", ui, " is:\n");
displayBits(reverseBits(ui));
waitOnInput();
return 0;
}
fftLite::fftLite(size_t N_) : cosLUT(nullptr), sinLUT(nullptr),
cosLUT_blu(nullptr), sinLUT_blu(nullptr),
revBits(nullptr), temps(nullptr), N(0), log2N(0)
{
if (N_ == 0)
return;
// prepare for radix-2 Cooley-Tukey
if (isPowOf2(N_))
{
M = 0;
N = N_;
}
else { // prepare for Bluestein
M = N_;
N = nextpow2(2 * N_ + 1);
cosLUT_blu = new double[M];
sinLUT_blu = new double[M];
for (int i = 0; i < M; ++i) {
double temp = M_PI * (((uint64_t)i * i) % (2*M)) / M;
//double temp = M_PI * i * i / M; // cos(temp), with large temp
cosLUT_blu[i] = cos(temp);
sinLUT_blu[i] = sin(temp);
}
temps = new double[4 * N];
}
// radix twiddle factors
cosLUT = new double[N / 2];
sinLUT = new double[N / 2];
for (int i = 0; i < N / 2; ++i) {
cosLUT[i] = cos(2 * M_PI * i / N);
sinLUT[i] = sin(2 * M_PI * i / N);
}
// pre-compute bit reversal of position index
log2N = log2uint(N);
revBits = new int[N];
for (int i = 0; i < N; ++i)
revBits[i] = reverseBits(i, log2N);
}
/*
* Initialisation routine - sets up tables and space to work in.
* Returns a pointer to internal state, to be used when performing calls.
* On error, returns NULL.
* The pointer should be freed when it is finished with, by fft_close().
*/
fft_state *fft_init(void) {
fft_state *state;
unsigned int i;
state = malloc (sizeof(fft_state));
if(!state) return NULL;
for(i = 0; i < FFT_BUFFER_SIZE; i++) {
bitReverse[i] = reverseBits(i);
}
for(i = 0; i < FFT_BUFFER_SIZE / 2; i++) {
double j = 2 * PI * i / FFT_BUFFER_SIZE;
costable[i] = cos(j);
sintable[i] = sin(j);
}
return state;
}
/*
* Write the supplied data to the specified strip.
* There must be space for the data; we don't check
* if strips overlap!
*
* NB: Image length must be setup before writing.
*/
tsize_t ExifStripImage::writeRawStrip(exif_uint32 strip, tdata_t data, tsize_t cc)
{
if (!WRITECHECKSTRIPS)
return ((tsize_t) -1);
/*
* Check strip array to make sure there's space.
* We don't support dynamically growing files that
* have data organized in separate bitplanes because
* it's too painful. In that case we require that
* the imagelength be set properly before the first
* write (so that the strips array will be fully
* allocated above).
*/
if (strip >= mNStrips)
{
if (mExifdir->planarConfig() == PLANARCONFIG_SEPARATE)
{
// Can not grow image by strips when using separate planes
return ((tsize_t) -1);
}
/*
* Watch out for a growing image. The value of
* strips/image will initially be 1 (since it
* can't be deduced until the imagelength is known).
*/
if (strip >= mStripsperimage)
mStripsperimage =
EXIFhowmany(mExifdir->imageLength(),mExifdir->rowsPerStrip());
if (!growStrips(1))
return ((tsize_t) -1);
}
mCurstrip = strip;
if (!mExifdir->isFillOrder( mExifio, FILLORDER_MSB2LSB) &&
(mExifio->flags() & EXIF_NOBITREV) == 0)
{
reverseBits( (tdata_t)data, cc );
}
return ((appendToStrip(strip, (tdata_t) data, cc) == EXIF_OK) ?
cc : (tsize_t) -1);
}
void FastFourierTransform::initFFT()
{
if( gFFTBitTable != NULL ){
for(int i=0; i<MaxFastBits; i++)
delete[] gFFTBitTable[i];
gFFTBitTable = NULL;
}
gFFTBitTable = new int *[MaxFastBits];
int len = 2;
for (int b = 1; b <= MaxFastBits; b++) {
gFFTBitTable[b - 1] = new int[len];
for (int i = 0; i < len; i++)
gFFTBitTable[b - 1][i] = reverseBits(i, b);
len <<= 1;
}
}
/*
* Initialisation routine - sets up tables and space to work in.
* Returns a pointer to internal state, to be used when performing calls.
* On error, returns NULL.
* The pointer should be freed when it is finished with, by fft_close().
*/
fft_state *visual_fft_init(void) {
fft_state *p_state;
unsigned int i;
p_state = malloc( sizeof(*p_state) );
if(! p_state )
return NULL;
for(i = 0; i < FFT_BUFFER_SIZE; i++)
{
p_state->bitReverse[i] = reverseBits(i);
}
for(i = 0; i < FFT_BUFFER_SIZE / 2; i++)
{
float j = 2 * PI * i / FFT_BUFFER_SIZE;
p_state->costable[i] = cos(j);
p_state->sintable[i] = sin(j);
}
return p_state;
}
void
FFT::process(bool p_bInverseTransform,
const double *p_lpRealIn, const double *p_lpImagIn,
double *p_lpRealOut, double *p_lpImagOut)
{
if (!p_lpRealIn || !p_lpRealOut || !p_lpImagOut) return;
// std::cerr << "FFT::process(" << m_n << "," << p_bInverseTransform << ")" << std::endl;
unsigned int NumBits;
unsigned int i, j, k, n;
unsigned int BlockSize, BlockEnd;
double angle_numerator = 2.0 * M_PI;
double tr, ti;
if( !MathUtilities::isPowerOfTwo(m_n) )
{
std::cerr << "ERROR: FFT::process: Non-power-of-two FFT size "
<< m_n << " not supported in this implementation"
<< std::endl;
return;
}
if( p_bInverseTransform ) angle_numerator = -angle_numerator;
NumBits = numberOfBitsNeeded ( m_n );
for( i=0; i < m_n; i++ )
{
j = reverseBits ( i, NumBits );
p_lpRealOut[j] = p_lpRealIn[i];
p_lpImagOut[j] = (p_lpImagIn == 0) ? 0.0 : p_lpImagIn[i];
}
BlockEnd = 1;
for( BlockSize = 2; BlockSize <= m_n; BlockSize <<= 1 )
{
double delta_angle = angle_numerator / (double)BlockSize;
double sm2 = -sin ( -2 * delta_angle );
double sm1 = -sin ( -delta_angle );
double cm2 = cos ( -2 * delta_angle );
double cm1 = cos ( -delta_angle );
double w = 2 * cm1;
double ar[3], ai[3];
for( i=0; i < m_n; i += BlockSize )
{
ar[2] = cm2;
ar[1] = cm1;
ai[2] = sm2;
ai[1] = sm1;
for ( j=i, n=0; n < BlockEnd; j++, n++ )
{
ar[0] = w*ar[1] - ar[2];
ar[2] = ar[1];
ar[1] = ar[0];
ai[0] = w*ai[1] - ai[2];
ai[2] = ai[1];
ai[1] = ai[0];
k = j + BlockEnd;
tr = ar[0]*p_lpRealOut[k] - ai[0]*p_lpImagOut[k];
ti = ar[0]*p_lpImagOut[k] + ai[0]*p_lpRealOut[k];
p_lpRealOut[k] = p_lpRealOut[j] - tr;
p_lpImagOut[k] = p_lpImagOut[j] - ti;
p_lpRealOut[j] += tr;
p_lpImagOut[j] += ti;
}
}
BlockEnd = BlockSize;
}
if( p_bInverseTransform )
{
double denom = (double)m_n;
for ( i=0; i < m_n; i++ )
{
p_lpRealOut[i] /= denom;
p_lpImagOut[i] /= denom;
}
}
}
int main(void){
uint32_t n = 43261596;
uint32_t result = reverseBits(n);
return 0;
}
ExifStatus ExifStripImage::readScanline(tdata_t buf, exif_uint32 row,
tsample_t sample)
{
if (row >= mExifdir->imageLength())
{ /* out of range */
// Row out of range
return EXIF_ERROR;
}
ExifStatus status = EXIF_OK;
exif_uint32 strip = computeStrip( row, sample, status ) ;
if ( status != EXIF_OK )
return status;
// if (strip != mCurstrip)
// { /* different strip, refill */
// if (!fillStrip(strip))
// return (0);
// }
tsize_t bytecount;
if (strip >= mNStrips)
{
// Strip out of range
return EXIF_ERROR;
}
std::vector<exif_uint32> stripbytecount = mExifdir->stripByteCounts();
bytecount = stripbytecount[strip];
if (bytecount <= 0)
{
// Invalid strip byte count
return EXIF_ERROR;
}
if (mScanlinesize != (tsize_t)-1 && mScanlinesize < bytecount)
bytecount = mScanlinesize;
std::vector<exif_uint32> stripoffset = mExifdir->stripOffsets();
exifoff_t offset = stripoffset[strip] + mExifdir->getExifOffset() ;
offset += (row - strip * mExifdir->rowsPerStrip()) * bytecount ;
if (mExifio->seek(offset, SEEK_SET) != offset)
{
// Seek error at scanline
return EXIF_ERROR;
}
if (mExifio->read(buf, bytecount) != bytecount)
{
// Read error at scanline
return EXIF_ERROR;
}
if (!mExifdir->isFillOrder( mExifio, FILLORDER_MSB2LSB ) &&
(mExifio->flags() & EXIF_NOBITREV) == 0)
reverseBits( buf, bytecount );
return EXIF_OK ;
}