Play back compressed 1-bit I/Q sample data
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OSQZSS
parent
0106011ce3
commit
a60b5b1cb5
@ -2,7 +2,13 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <libbladeRF.h>
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#ifdef _WIN32
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#include "getopt.h"
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#else
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#include <unistd.h>
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#endif
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#define TX_FREQUENCY 1575420000
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#define TX_SAMPLERATE 2600000
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@ -15,6 +21,18 @@
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#define NUM_TRANSFERS 16
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#define TIMEOUT_MS 1000
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#define AMPLITUDE (1000) // Default amplitude for 12-bit I/Q
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void usage(void)
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{
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fprintf(stderr, "Usage: bladeplayer [options]\n"
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" -f <tx_file> I/Q sampling data file (required)\n"
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" -b <iq_bits> I/Q data format [1/16] (default: 16)\n"
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" -g <tx_vga1> TX VGA1 gain (default: %d)\n",
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TX_VGA1);
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return;
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}
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int main(int argc, char *argv[])
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{
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int status;
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@ -26,16 +44,71 @@ int main(int argc, char *argv[])
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enum state {INIT, READ_FILE, PAD_TRAILING, DONE};
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enum state state = INIT;
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if (argc!=2) {
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fprintf(stderr, "Usage: bladeplayer <tx_file>\n");
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int compressed = 0;
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uint8_t *read_buffer;
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size_t samples_read;
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int16_t lut[256][8];
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int16_t amp = AMPLITUDE;
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int i,k;
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int gain = TX_VGA1;
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int result;
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int data_format;
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char txfile[128];
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// Empty TX file name
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txfile[0] = 0;
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if (argc<3) {
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usage();
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exit(1);
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}
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while ((result=getopt(argc,argv,"g:b:f:"))!=-1)
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{
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switch (result)
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{
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case 'g':
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gain = atoi(optarg);
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if (gain>-4 || gain<-35)
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{
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printf("ERROR: Invalid TX VGA1 gain.\n");
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exit(1);
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}
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break;
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case 'b':
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data_format = atoi(optarg);
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if (data_format!=1 && data_format!=16)
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{
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printf("ERROR: Invalid I/Q data format.\n");
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exit(1);
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}
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else if (data_format==1)
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compressed = 1;
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break;
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case 'f':
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strcpy(txfile, optarg);
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break;
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case ':':
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case '?':
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usage();
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exit(1);
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default:
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break;
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}
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}
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// Open TX file.
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fp = fopen(argv[1], "rb");
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if (txfile[0]==0)
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{
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printf("ERROR: I/Q sampling data file is not specified.\n");
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exit(1);
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}
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fp = fopen(txfile, "rb");
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if (fp==NULL) {
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fprintf(stderr, "Failed to open TX file: %s\n", argv[1]);
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fprintf(stderr, "ERROR: Failed to open TX file: %s\n", argv[1]);
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exit(1);
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}
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@ -75,13 +148,13 @@ int main(int argc, char *argv[])
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printf("TX bandwidth: %u Hz\n", TX_BANDWIDTH);
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}
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status = bladerf_set_txvga1(dev, TX_VGA1);
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status = bladerf_set_txvga1(dev, gain);
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if (status != 0) {
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fprintf(stderr, "Failed to set TX VGA1 gain: %s\n", bladerf_strerror(status));
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goto out;
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}
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else {
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printf("TX VGA1 gain: %d dB\n", TX_VGA1);
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printf("TX VGA1 gain: %d dB\n", gain);
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}
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status = bladerf_set_txvga2(dev, TX_VGA2);
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@ -97,13 +170,27 @@ int main(int argc, char *argv[])
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printf("Running...\n");
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// Allocate a buffer to hold each block of samples to transmit.
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tx_buffer = (int16_t*)malloc(SAMPLES_PER_BUFFER* 2 * sizeof(int16_t));
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tx_buffer = (int16_t*)malloc(SAMPLES_PER_BUFFER * 2 * sizeof(int16_t));
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if (tx_buffer == NULL) {
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fprintf(stderr, "Failed to allocate TX buffer.\n");
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goto out;
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}
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// if compressed
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read_buffer = (uint8_t*)malloc(SAMPLES_PER_BUFFER / 4);
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if (read_buffer == NULL) {
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fprintf(stderr, "Failed to allocate read buffer.\n");
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goto out;
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}
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for (i=0; i<256; i++)
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{
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for (k=0; k<8; k++)
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lut[i][k] = ((i>>(7-k))&0x1)?amp:-amp;
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}
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// Configure the TX module for use with the synchronous interface.
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status = bladerf_sync_config(dev,
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BLADERF_MODULE_TX,
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@ -131,6 +218,9 @@ int main(int argc, char *argv[])
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int16_t *tx_buffer_current = tx_buffer;
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unsigned int buffer_samples_remaining = SAMPLES_PER_BUFFER;
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// if compressed
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unsigned int read_samples_remaining = SAMPLES_PER_BUFFER / 4;
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// Keep adding to the buffer until it is full or a failure occurs
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while (buffer_samples_remaining > 0 && status == 0 && state != DONE) {
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size_t samples_populated = 0;
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@ -139,11 +229,35 @@ int main(int argc, char *argv[])
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case INIT:
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case READ_FILE:
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// Read from the input file
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samples_populated = fread(tx_buffer_current,
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2 * sizeof(int16_t),
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buffer_samples_remaining,
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fp);
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if (compressed)
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{
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int16_t *write_buffer_current = tx_buffer;
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samples_read = fread(read_buffer,
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sizeof(uint8_t),
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read_samples_remaining,
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fp);
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samples_populated = samples_read * 4;
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buffer_samples_remaining = read_samples_remaining * 4;
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// Expand compressed data into TX buffer
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for (i=0; i<samples_read; i++)
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{
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memcpy(write_buffer_current, lut[read_buffer[i]], 8);
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// Advance the write buffer pointer
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write_buffer_current += 8;
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}
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}
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else
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{
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samples_populated = fread(tx_buffer_current,
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2 * sizeof(int16_t),
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buffer_samples_remaining,
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fp);
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}
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// If the end of the file was reached, pad the rest of the buffer and finish.
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if (feof(fp)) {
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state = PAD_TRAILING;
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@ -187,6 +301,9 @@ int main(int argc, char *argv[])
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// Free up our resources
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free(tx_buffer);
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// if compressed
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free(read_buffer);
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// Close TX file
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fclose(fp);
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