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university:tools:pluto:controlling_the_transceiver_and_transferring_data [28 Apr 2017 11:29] – Michael Hennerichuniversity:tools:pluto:controlling_the_transceiver_and_transferring_data [28 Apr 2017 15:52] – [Receiving data] Michael Hennerich
Line 17: Line 17:
   * [[https://www.youtube.com/watch?v=CS9NuRBzN5Y|libiio API introduction presentation video]]   * [[https://www.youtube.com/watch?v=CS9NuRBzN5Y|libiio API introduction presentation video]]
  
 +===== Controlling the transceiver =====
 +
 +<code c>
 +int main (int argc, char **argv)
 +{
 + struct iio_context *ctx;
 + struct iio_device *phy;
 +
 + ctx =  iio_create_context_from_uri("ip:192.168.2.1");
 +
 + phy = iio_context_find_device(ctx, "ad9361-phy");
 +
 + iio_channel_attr_write_longlong(
 + iio_device_find_channel(phy, "altvoltage0", true),
 + "frequency",
 + 2400000000); /* RX LO frequency 2.4GHz */
 +
 + iio_channel_attr_write_longlong(
 + iio_device_find_channel(phy, "voltage0", false),
 + "sampling_frequency",
 + 50000000); /* RX baseband rate 50 MSPS */
 +
 + receive(ctx);
 +
 + iio_context_destroy(ctx);
 +
 + return 0;
 +} 
 +</code>
 +
 +===== Receiving data =====
 +
 +<code c>
 +int receive(struct iio_context *ctx)
 +{
 + struct iio_device *dev;
 + struct iio_channel *rx0_i, *rx0_q;
 + struct iio_buffer *rxbuf;
 +
 + dev = iio_context_find_device(ctx, "cf-ad9361-lpc");
 +
 + rx0_i = iio_device_find_channel(dev, "voltage0", 0);
 + rx0_q = iio_device_find_channel(dev, "voltage1", 0);
 +
 + iio_channel_enable(rx0_i);
 + iio_channel_enable(rx0_q);
 +
 + rxbuf = iio_device_create_buffer(dev, 4096, false);
 + if (!rxbuf) {
 + perror("Could not create RX buffer");
 + shutdown();
 + }
 +
 + while (true) {
 + void *p_dat, *p_end, *t_dat;
 + ptrdiff_t p_inc;
 +
 + iio_buffer_refill(rxbuf);
 +
 + p_inc = iio_buffer_step(rxbuf);
 + p_end = iio_buffer_end(rxbuf);
 +
 + for (p_dat = iio_buffer_first(rxbuf, rx0_i); p_dat < p_end; p_dat += p_inc, t_dat += p_inc) {
 + const int16_t i = ((int16_t*)p_dat)[0]; // Real (I)
 + const int16_t q = ((int16_t*)p_dat)[1]; // Imag (Q)
 +
 + /* Process here */
 +
 + }
 + }
 +
 + iio_buffer_destroy(rxbuf);
 +
 +}
 +</code>
  
university/tools/pluto/controlling_the_transceiver_and_transferring_data.txt · Last modified: 18 Dec 2020 17:55 by Rob Riggs

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