sdr: ensure that all samples were transmitted before TX is stopped
This is done by tracking the time that the transmitter must stay on based on the number of samples to be transmitted and the sampling rate.
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@ -69,6 +69,8 @@ static int tx_callback(hackrf_transfer *transfer)
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int result;
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int retcode = 0;
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fprintf(stderr, "tx_callback()\n");
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sdr_ctx_t *sdr_ctx = (sdr_ctx_t*)transfer->tx_ctx;
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if(transfer->valid_length % 2 != 0) {
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@ -96,11 +98,20 @@ static int tx_callback(hackrf_transfer *transfer)
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sdr_ctx->tx_done = true;
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}
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if(sdr_ctx->tx_start_time == 0.0) {
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sdr_ctx->tx_start_time = get_hires_time();
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sdr_ctx->tx_duration = 0.0f;
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}
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for(size_t i = 0; i < samples_read; i++) {
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transfer->buffer[2*i + 0] = clamp_float2int8(creal(samples[i]));
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transfer->buffer[2*i + 1] = clamp_float2int8(cimag(samples[i]));
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}
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sdr_ctx->tx_duration += (double)samples_read / SDR_TX_SAMPLING_RATE;
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fprintf(stderr, "copied %u samples to HackRF.\n", samples_read);
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if(samples_read < samples_requested) {
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// fill the rest with zeros
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memset(&transfer->buffer[2*samples_read], 0, 2*(samples_requested-samples_read));
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@ -255,6 +266,7 @@ result_t sdr_start_tx(sdr_ctx_t *ctx, size_t burst_size)
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CHECK_HACKRF_RESULT(result, "hackrf_start_tx");
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ctx->status = SDR_STATUS_TX;
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ctx->tx_start_time = 0.0f; // will be updated by tx_callback
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return OK;
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}
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@ -32,6 +32,8 @@ typedef struct {
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sdr_status_t status;
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bool tx_done;
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double tx_duration;
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double tx_start_time; // time when tx_callback() was first called
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} sdr_ctx_t;
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result_t sdr_init(sdr_ctx_t *ctx);
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