/**
* Connects to a cheetah spi interface.
* @param port
* The port if the interface.
* @param mode
* The spi mode (0-3)
* @param baudrate
* The baudrate of the interface (kHz).
* @return
* True on success.
*/
bool CheetahSpi::connectToDevice(quint32 port, qint16 mode, quint32 baudrate)
{
bool result = true;
if (m_handle > 0)
{
ch_close(m_handle);
m_handle = 0;
}
m_handle = ch_open(port);
if (m_handle > 0)
{
ch_spi_configure(m_handle, (CheetahSpiPolarity)(mode >> 1), (CheetahSpiPhase)(mode & 1),
CH_SPI_BITORDER_MSB, 0x0);
// Power the flash using the Cheetah adapter's power supply.
ch_target_power(m_handle, CH_TARGET_POWER_ON);
ch_sleep_ms(100);
int currentBaudrate = ch_spi_bitrate(m_handle, (int)baudrate);
if (currentBaudrate != (int)baudrate)
{
ch_close(m_handle);
m_handle = 0;
}
else
{
ch_spi_queue_ss(m_handle, 0);
}
}
//=========================================================================
// MAIN PROGRAM
//=========================================================================
int main (int argc, char *argv[]) {
Cheetah handle;
int port = 0;
int bitrate = 0;
int mode = 0;
if (argc < 4) {
printf("usage: timing PORT BITRATE MODE\n");
printf("\n");
printf("MODE possibilities are:\n");
printf(" mode 0 : pol = 0, phase = 0\n");
printf(" mode 1 : pol = 0, phase = 1\n");
printf(" mode 2 : pol = 1, phase = 0\n");
printf(" mode 3 : pol = 1, phase = 1\n");
return 1;
}
port = atoi(argv[1]);
bitrate = atoi(argv[2]);
mode = atoi(argv[3]);
// Open the device
handle = ch_open(port);
if (handle <= 0) {
printf("Unable to open Cheetah device on port %d\n", port);
printf("Error code = %d (%s)\n", handle, ch_status_string(handle));
return 1;
}
printf("Opened Cheetah device on port %d\n", port);
printf("Host interface is %s\n",
(ch_host_ifce_speed(handle)) ? "high speed" : "full speed");
fflush(stdout);
// Ensure that the SPI subsystem is configured
ch_spi_configure(handle, (mode >> 1), mode & 1, CH_SPI_BITORDER_MSB, 0x0);
printf("SPI configuration set to mode %d, MSB shift, SS[2:0] active low\n",
mode);
fflush(stdout);
// Power the target using the Cheetah adapter's power supply
ch_target_power(handle, CH_TARGET_POWER_ON);
ch_sleep_ms(100);
// Set the bitrate
bitrate = ch_spi_bitrate(handle, bitrate);
printf("Bitrate set to %d kHz\n", bitrate);
fflush(stdout);
_timing(handle);
// Close and exit
ch_close(handle);
return 0;
}
int main( int argc, char ** argv )
{
ros::init( argc, argv, "sonar_driver" );
if (argc < 3) {
ROS_ERROR("sonar_driver usage: sudo rosrun sonar_driver sonar_driver PORT BITRATE\n");
//port 0, bitrate 40000kHz
return 1;
}
// Initialize Cheetah parameters
port = atoi(argv[1]);
bitrate = atoi(argv[2]); //kHz
// Open the device
handle = ch_open(port);
if (handle <= 0) {
ROS_ERROR("Unable to open Cheetah device on port %d (Error code = %d: %s)", port, handle, ch_status_string(handle));
exit(1);
}
ROS_INFO("Opened Cheetah device on port %d", port);
ROS_INFO("Host interface is %s", (ch_host_ifce_speed(handle)) ? "high speed" : "full speed");
// Configure SPI subsystem
ch_spi_configure(handle, CH_SPI_POL_RISING_FALLING, CH_SPI_PHASE_SETUP_SAMPLE, CH_SPI_BITORDER_MSB, 0x0);
ROS_INFO("SPI configuration set to mode %d, %s shift, SS[2:0] active low", mode, "MSB");
// Power the target using the Cheetah's 5V power supply
ch_target_power(handle, CH_TARGET_POWER_ON);
ch_sleep_ms(100);
// Set the bitrate
bitrate = ch_spi_bitrate(handle, bitrate);
ROS_INFO("Bitrate set to %d kHz", bitrate);
// Make a simple queue to assert OE
ch_spi_queue_clear(handle);
ch_spi_queue_oe(handle, 1);
ch_spi_batch_shift(handle, 0, 0);
// Queue the batch
ROS_INFO("Beginning to queue SPI packets...");
ch_spi_queue_clear(handle);
for (int i = 0; i < DATA_BLOCK_SIZE; ++i) {
// Convert Slave 1
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xE);
// Convert Slave 2
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xD);
// Convert Slave 3
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xB);
}
ROS_INFO("Finished queueing packets\n");
// Open output filestreams
std::ofstream file1 ("1_adc_samples.txt");
std::ofstream file2 ("2_adc_samples.txt");
std::ofstream file3 ("3_adc_samples.txt");
int batch_cnt = 1; //count number of sample batches
double elapsed;
s64 start;
while( ros::ok() ) {
// Submit the batch and collect data
ROS_INFO("Collecting data from batch %d...", batch_cnt);
start = _timeMillis();
ch_spi_async_submit(handle);
ret = ch_spi_async_collect(handle, TX_LENGTH, data_in);
elapsed = ((double)(_timeMillis() - start)) / 1000;
ROS_INFO("collected %d bytes from batch #%04d in %.4lf seconds\n", ret, batch_cnt, elapsed);
if (ret < 0) ROS_INFO("status error: %s\n", ch_status_string(ret));
batch_cnt++;
// Process raw data for the 12-bit ADC's, and write data to text files
int data_idx = 0;
if ( file1.is_open() && file2.is_open() && file3.is_open() ) {
for (int j = 0; j < TX_LENGTH; j += 6) {
// SS3 Data
input = (data_in[j] << 8) + data_in[j+1];
valid_data_point = (input & 0x3ffc) >> 2;
if(valid_data_point >= 0x0800) valid_data_point = valid_data_point - 0x1000; //convert 2's comp to signed
data3[data_idx] = valid_data_point;
file3 << data3[data_idx] << ",";
// SS1 Data
input = (data_in[j+2] << 8) + data_in[j+3];
valid_data_point = (input & 0x3ffc) >> 2;
if(valid_data_point >= 0x0800) valid_data_point = valid_data_point - 0x1000;
data1[data_idx] = valid_data_point;
file1 << data1[data_idx] << ",";
// SS2 Data
input = (data_in[j+4] << 8) + data_in[j+5];
valid_data_point = (input & 0x3ffc) >> 2;
if(valid_data_point >= 0x0800) valid_data_point = valid_data_point - 0x1000;
data2[data_idx] = valid_data_point;
file2 << data2[data_idx] << ",";
++data_idx;
}
}
else std::cout << "Error opening output filestream!" << std::endl;
}
int main (int argc, char const *argv[]) {
//fprintf(stderr, "Starting up...\n");
port = 0;
bitrate = 10000;
double sampling_frequency = SeaBee3_Sonar::getSamplingFrequency(bitrate, BIN_PREDICTION_M, BIN_PREDICTION_B);
// Assign Target Frequencies
target_frequency1 = 25000; //atoi(argv[2]);
target_frequency2 = 23000; //atoi(argv[3]);
target_wavelength1 = (double)SPEED_SOUND_WATER / (double)target_frequency1;
target_wavelength2 = (double)SPEED_SOUND_WATER / (double)target_frequency2;
// Declare Data Vectors
double FP_adc1_samples[FP_FFT_LENGTH], FP_adc2_samples[FP_FFT_LENGTH], FP_adc3_samples[FP_FFT_LENGTH];
adc1_data_history = new std::vector<double>;
adc2_data_history = new std::vector<double>;
adc3_data_history = new std::vector<double>;
// Define and allocate the Data Vectors
double *data1, *data2, *data3;
data1 = (double *) fftw_malloc(sizeof(double) * DATA_BLOCK_SIZE);
data2 = (double *) fftw_malloc(sizeof(double) * DATA_BLOCK_SIZE);
data3 = (double *) fftw_malloc(sizeof(double) * DATA_BLOCK_SIZE);
memset(data1, 0, sizeof(double) * DATA_BLOCK_SIZE);
memset(data2, 0, sizeof(double) * DATA_BLOCK_SIZE);
memset(data3, 0, sizeof(double) * DATA_BLOCK_SIZE);
// Open the device
handle = ch_open(port);
if (handle <= 0) {
fprintf(stderr, "Unable to open Cheetah device on port %d\n", port);
fprintf(stderr, "Error code = %d (%s)\n", handle, ch_status_string(handle));
exit(1);
}
fprintf(stderr, "Opened Cheetah device on port %d\n", port);
fprintf(stderr, "Host interface is %s\n",
(ch_host_ifce_speed(handle)) ? "high speed" : "full speed");
// Ensure that the SPI subsystem is configured.
ch_spi_configure(handle, CheetahSpiPolarity(mode >> 1), CheetahSpiPhase(mode & 1), CH_SPI_BITORDER_MSB, 0x0);
fprintf(stderr, "SPI configuration set to mode %d, %s shift, SS[2:0] active low\n", mode, "MSB");
// Power the target using the Cheetah adapter's power supply.
ch_target_power(handle, CH_TARGET_POWER_ON);
ch_sleep_ms(100);
// Set the bitrate.
bitrate = ch_spi_bitrate(handle, bitrate);
fprintf(stderr, "Bitrate set to %d kHz\n", bitrate);
// Make a simple queue to just assert OE.
ch_spi_queue_clear(handle);
ch_spi_queue_oe(handle, 1);
ch_spi_batch_shift(handle, 0, 0);
// Queue the batch, which is a sequence of SPI packets (back-to-back) each of length 2.
fprintf(stderr, "Beginning to queue SPI packets...");
data_out[0] = 0xff;
data_out[1] = 0xff;
ch_spi_queue_clear(handle);
for (int i = 0; i < DATA_BLOCK_SIZE; ++i) {
// Convert Slave 1
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xE);
// Convert Slave 2
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xD);
// Convert Slave 3
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xB);
}
fprintf(stderr, " Done\n");
// Submit the first batch
ch_spi_async_submit(handle);
int z = 0;
while (true) {
//fprintf(stderr, "Starting Loop!\n");
// Submit another batch, while the previous one is in
// progress. The application may even clear the current
// batch queue and queue a different set of SPI
// transactions before submitting this batch
// asynchronously.
ch_spi_async_submit(handle);
// The application can now perform some other functions
// while the Cheetah is both finishing the previous batch
// and shifting the current batch as well. In order to
// keep the Cheetah's pipe full, this entire loop must
// complete AND another batch must be submitted
// before the current batch completes.
//ch_sleep_ms(1);
// Collect the previous batch
// The length of the batch, FP_FFT_LENGTH * 6, come from the fact that 3 ADCs
// are batched and the return data requires 2 bytes. (2 * 3 = 6)
ret = ch_spi_async_collect(handle, TX_LENGTH, data_in);
int data_idx = 0;
for (int j = 0; j < TX_LENGTH; j += 6) {
// SS3 Data
input = (data_in[j] << 8) + data_in[j+1];
ready_bit = input & 0x4000;
valid_data_point = (input & 0x3ffc) >> 2;
data3[data_idx] = valid_data_point;
// SS1 Data
input = (data_in[j+2] << 8) + data_in[j+3];
ready_bit = input & 0x4000;
valid_data_point = (input & 0x3ffc) >> 2;
data1[data_idx] = valid_data_point;
// SS2 Data
input = (data_in[j+4] << 8) + data_in[j+5];
ready_bit = input & 0x4000;
valid_data_point = (input & 0x3ffc) >> 2;
data2[data_idx] = valid_data_point;
++data_idx;
}
// Append current data to history vectors
adc1_data_history->insert(adc1_data_history->end(), data1, data1 + DATA_BLOCK_SIZE);
adc2_data_history->insert(adc2_data_history->end(), data2, data2 + DATA_BLOCK_SIZE);
adc3_data_history->insert(adc3_data_history->end(), data3, data3 + DATA_BLOCK_SIZE);
//printf("Vector Length: %d\n", adc1_data_history->size());
for (int vector_idx = 0; vector_idx <= adc1_data_history->size() - FP_FFT_LENGTH; vector_idx += FP_FFT_LENGTH) {
//fprintf(stderr, "Copying vector memory\n");
std::copy(adc1_data_history->begin() + vector_idx, adc1_data_history->begin() + vector_idx + FP_FFT_LENGTH, FP_adc1_samples);
std::copy(adc2_data_history->begin() + vector_idx, adc2_data_history->begin() + vector_idx + FP_FFT_LENGTH, FP_adc2_samples);
std::copy(adc3_data_history->begin() + vector_idx, adc3_data_history->begin() + vector_idx + FP_FFT_LENGTH, FP_adc3_samples);
//fprintf(stderr, "Done copying vector memory\n");
/* for (int i = 0; i < FP_FFT_LENGTH; ++i)
fprintf(stderr, "%5.0f", FP_adc1_samples[i]);
fprintf(stderr, "\n");*/
//fprintf(stderr, "Prepping DataToFFT\n");
SeaBee3_Sonar::DataToFFT fp_fft_f1 = SeaBee3_Sonar::DataToFFT(FP_adc1_samples, FP_adc2_samples, FP_adc3_samples,
FP_FFT_LENGTH, sampling_frequency, target_frequency1);
SeaBee3_Sonar::DataToFFT fp_fft_f2 = SeaBee3_Sonar::DataToFFT(FP_adc1_samples, FP_adc2_samples, FP_adc3_samples,
FP_FFT_LENGTH, sampling_frequency, target_frequency2);
//fprintf(stderr, "Done prepping DataToFFT\n");
bin_current_mag_sq_1 = fp_fft_f1.getMagnitude(1);
bin_current_mag_sq_2 = fp_fft_f1.getMagnitude(2);
bin_current_mag_sq_3 = fp_fft_f1.getMagnitude(3);
// Index Check
if (FP_bin_mean_idx >= FP_BIN_HISTORY_LENGTH)
FP_bin_mean_idx = 0;
// Initilize Mean Array
if (FP_bin_history_fill < FP_BIN_HISTORY_LENGTH) {
FP_adc1_bin_history[FP_bin_mean_idx] = bin_current_mag_sq_1;
FP_adc2_bin_history[FP_bin_mean_idx] = bin_current_mag_sq_2;
FP_adc3_bin_history[FP_bin_mean_idx] = bin_current_mag_sq_3;
++FP_bin_mean_idx;
++FP_bin_history_fill;
continue;
}
adc1_bin_mean = 0;
adc2_bin_mean = 0;
adc3_bin_mean = 0;
for (int i = 0; i < FP_BIN_HISTORY_LENGTH; ++i) {
adc1_bin_mean += FP_adc1_bin_history[i];
adc2_bin_mean += FP_adc2_bin_history[i];
adc3_bin_mean += FP_adc3_bin_history[i];
}
adc1_bin_mean /= (double)FP_BIN_HISTORY_LENGTH;
adc2_bin_mean /= (double)FP_BIN_HISTORY_LENGTH;
adc3_bin_mean /= (double)FP_BIN_HISTORY_LENGTH;
if (bin_current_mag_sq_1 > MEAN_SCALE_FACTOR * adc1_bin_mean &&
bin_current_mag_sq_2 > MEAN_SCALE_FACTOR * adc2_bin_mean &&
bin_current_mag_sq_3 > MEAN_SCALE_FACTOR * adc3_bin_mean) {
FP_bin_indicator.push_back(true);
printf("1 ");
printf("%15.0f\n", bin_current_mag_sq_3);
} else {
FP_bin_indicator.push_back(false);
//printf("0 ");
//printf("%15.0f\n", bin_current_mag_sq_3);
FP_adc1_bin_history[FP_bin_mean_idx] = bin_current_mag_sq_1;
FP_adc2_bin_history[FP_bin_mean_idx] = bin_current_mag_sq_2;
FP_adc3_bin_history[FP_bin_mean_idx] = bin_current_mag_sq_3;
//printf("%10.0f, %10.0f, %10.0f\n", adc1_bin_mean, adc2_bin_mean, adc3_bin_mean);
++FP_bin_mean_idx;
}
if (FP_bin_indicator[0] == 0 && FP_bin_indicator[1] == 1) {
printf("Just had a pulse!\n");
int SP_bin_count = 0;
while (FP_bin_indicator[SP_bin_count + 1] != 0)
++SP_bin_count;
printf("Signal Bin Count of %d\n", SP_bin_count);
if (SP_bin_count * FP_FFT_LENGTH >= FP_MIN_SAMPLE_LENGTH) {
int SP_fft_length = SP_bin_count * FP_FFT_LENGTH;
// Copy the sample data into new double array
double *SP_adc1_samples = new double[SP_fft_length];
double *SP_adc2_samples = new double[SP_fft_length];
double *SP_adc3_samples = new double[SP_fft_length];
std::copy(adc1_data_history->begin() + vector_idx - (SP_bin_count) * FP_FFT_LENGTH, adc1_data_history->begin() + vector_idx, SP_adc1_samples);
std::copy(adc2_data_history->begin() + vector_idx - (SP_bin_count) * FP_FFT_LENGTH, adc2_data_history->begin() + vector_idx, SP_adc2_samples);
std::copy(adc3_data_history->begin() + vector_idx - (SP_bin_count) * FP_FFT_LENGTH, adc3_data_history->begin() + vector_idx, SP_adc3_samples);
// Delete all data up to and including the detected ping
adc1_data_history->erase(adc1_data_history->begin(), adc1_data_history->begin() + vector_idx);
adc2_data_history->erase(adc2_data_history->begin(), adc2_data_history->begin() + vector_idx);
adc3_data_history->erase(adc3_data_history->begin(), adc3_data_history->begin() + vector_idx);
/* // DEBUG
for (int blah = 0; blah < FP_FFT_LENGTH; ++blah)
printf("%5.0f", FP_adc1_samples[blah]);
printf("\n\n\n\n");*/
SeaBee3_Sonar::DataToFFT sp_fft_f1 = SeaBee3_Sonar::DataToFFT(FP_adc1_samples, FP_adc2_samples, FP_adc3_samples,
FP_FFT_LENGTH, sampling_frequency, target_frequency1);
SeaBee3_Sonar::DataToFFT sp_fft_f2 = SeaBee3_Sonar::DataToFFT(FP_adc1_samples, FP_adc2_samples, FP_adc3_samples,
FP_FFT_LENGTH, sampling_frequency, target_frequency2);
fprintf(stderr, "SP Target Bin: %d\n", sp_fft_f1.getTargetBin());
double phase1 = sp_fft_f1.getPhase(1);
double phase2 = sp_fft_f1.getPhase(2);
double phase3 = sp_fft_f1.getPhase(3);
// Calculate usable phase differences
double delta1 = phase2 - phase1;
double delta2 = phase3 - phase2;
double delta3 = phase1 - phase3;
fprintf(stderr, "Phase: %5.5f %5.5f %5.5f\n", phase1, phase2, phase3);
fprintf(stderr, "Deltas: %5.5f %5.5f %5.5f\n", delta1, delta2, delta3);
// Determine minimum phase difference for pair selection
int min_index = 3;
if (fabs(delta2) < fabs(delta1) && fabs(delta2) < fabs(delta3))
min_index = 2;
if (fabs(delta1) < fabs(delta2) && fabs(delta1) < fabs(delta3))
min_index = 1;
double delta_tmp;
switch (min_index) {
case 1:
delta_tmp = delta1;
if (delta3 > delta2)
delta_tmp = -1.0 * delta1 + SeaBee3_Sonar::sign(delta_tmp) * 2.0 * M_PI;
angle_estimate1 = delta_tmp * (double)(((double)target_wavelength1 / 2.0) / SENSOR_SPACING_2_1) * 180.0 / M_PI / 2.0;
break;
case 2:
delta_tmp = delta2;
if (delta1 > delta3)
delta_tmp = -1.0 * delta2 + 2.0 * M_PI;
angle_estimate1 = (delta_tmp - 4.0 / 3.0 * M_PI) * ((target_wavelength1 / 2.0) / SENSOR_SPACING_3_2) * 180.0 / M_PI / 2.0;
break;
case 3:
delta_tmp = delta3;
if (delta2 > delta1)
delta_tmp = -1.0 * delta3 - 2.0 * M_PI;
angle_estimate1 = (delta_tmp + 4.0 / 3.0 * M_PI ) * (((double)target_wavelength1 / 2.0) / SENSOR_SPACING_1_3) * 180.0 / M_PI / 2.0;
break;
default:
fprintf(stderr, "Sonar: Invalid min_index for phase difference.");
}
fprintf(stderr, "Min Index: %d\n", min_index);
fprintf(stderr, "Angle Estimate (1): %3.2f\n", angle_estimate1);
/* // DEBUG
for (int blah = 0; blah < SP_bin_count * FP_FFT_LENGTH; ++blah)
printf("%5.0f", SP_adc1_samples[blah]);
printf("\n");*/
}
}
// Check data history vector length constraints
if (adc1_data_history->size() > DATA_RETENTION_LENGTH) {
//printf("Data history is too long, reducing vector sizes\n");
tmp_data_buffer = new std::vector<double> (adc1_data_history->begin() + adc1_data_history->size() - DATA_RETENTION_LENGTH, adc1_data_history->end());
delete adc1_data_history;
adc1_data_history = tmp_data_buffer;
tmp_data_buffer = NULL;
}
if (adc2_data_history->size() > DATA_RETENTION_LENGTH) {
tmp_data_buffer = new std::vector<double> (adc2_data_history->begin() + adc2_data_history->size() - DATA_RETENTION_LENGTH, adc2_data_history->end());
delete adc2_data_history;
adc2_data_history = tmp_data_buffer;
tmp_data_buffer = NULL;
}
if (adc3_data_history->size() > DATA_RETENTION_LENGTH) {
tmp_data_buffer = new std::vector<double> (adc3_data_history->begin() + adc3_data_history->size() - DATA_RETENTION_LENGTH, adc3_data_history->end());
delete adc3_data_history;
adc3_data_history = tmp_data_buffer;
tmp_data_buffer = NULL;
}
if (FP_bin_indicator.size() > FP_BIN_HISTORY_LENGTH)
FP_bin_indicator.erase(FP_bin_indicator.begin());
}
}
return 0;
}
//=========================================================================
// FUNCTIONS
//=========================================================================
static void _blast_async (Cheetah handle, u32 txnlen, u32 iter) {
double elapsed;
u32 i;
int count = 0;
u08 data_out[4];
s64 start;
int ret;
// Make a simple queue to just assert OE.
ch_spi_queue_clear(handle);
ch_spi_queue_oe(handle, 1);
ch_spi_batch_shift(handle, 0, 0);
// Queue the batch which is a sequence of SPI packets
// (back-to-back) each of length 4.
ch_spi_queue_clear(handle);
for (i = 0; i < txnlen; ++i) {
// Convert Slave 1
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xE);
// Convert Slave 2
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xD);
// Convert Slave 3
ch_spi_queue_ss(handle, 0xF);
ch_spi_queue_array(handle, 2, data_out);
ch_spi_queue_ss(handle, 0xB);
}
start = _timeMillis();
// First, submit first batch
ch_spi_async_submit(handle);
for (i = 0; i < iter-1; ++i) {
// Submit another batch, while the previous one is in
// progress. The application may even clear the current
// batch queue and queue a different set of SPI
// transactions before submitting this batch
// asynchronously.
ch_spi_async_submit(handle);
// The application can now perform some other functions
// while the Cheetah is both finishing the previous batch
// and shifting the current batch as well. In order to
// keep the Cheetah's pipe full, this entire loop must
// complete AND another batch must be submitted
// before the current batch completes.
ch_sleep_ms(25);
// Collect the previous batch
ret = ch_spi_async_collect(handle, 0, 0);
elapsed = ((double)(_timeMillis() - start)) / 1000;
printf("collected batch #%03d in %.2lf seconds\n", i+1, elapsed);
if (ret < 0) printf("status error: %s\n", ch_status_string(ret));
fflush(stdout);
start = _timeMillis();
// The current batch is now shifting out on the SPI
// interface. The application can again do some more tasks
// here but this entire loop must finish so that a new
// batch is armed before the current batch completes.
ch_sleep_ms(25);
}
// Collect batch the last batch
ret = ch_spi_async_collect(handle, 0, 0);
elapsed = ((double)(_timeMillis() - start)) / 1000;
printf("collected batch #%03d in %.2lf seconds\n", i+1, elapsed);
if (ret < 0) printf("status error: %s\n", ch_status_string(ret));
fflush(stdout);
// Process raw data for the 12-bit ADC's, and write data to text files
int data_idx = 0;
if ( file1.is_open() && file2.is_open() && file3.is_open() ) {
for (int j = 0; j < TX_LENGTH; j += 6) {
// SS3 Data
input = (data_in[j] << 8) + data_in[j+1];
valid_data_point = (input & 0x3ffc) >> 2;
if(valid_data_point >= 0x0800) valid_data_point = valid_data_point - 0x1000; //convert 2's comp to signed
data3[data_idx] = valid_data_point;
file3 << data3[data_idx] << ",";
// SS1 Data
input = (data_in[j+2] << 8) + data_in[j+3];
valid_data_point = (input & 0x3ffc) >> 2;
if(valid_data_point >= 0x0800) valid_data_point = valid_data_point - 0x1000;
data1[data_idx] = valid_data_point;
file1 << data1[data_idx] << ",";
// SS2 Data
input = (data_in[j+4] << 8) + data_in[j+5];
valid_data_point = (input & 0x3ffc) >> 2;
if(valid_data_point >= 0x0800) valid_data_point = valid_data_point - 0x1000;
data2[data_idx] = valid_data_point;
file2 << data2[data_idx] << ",";
++data_idx;
}
}
else std::cout << "Error opening output filestream!" << std::endl;
