Wiki

Analog Devices Wiki

English
English
简体中文
简体中文
日本語
日本語
Руccкий
Руccкий

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
Next revisionBoth sides next revision
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 16:06] – [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 =====
 +
 +The code snippet below is a minimalistic example without error checking.
 +It shows how to control the AD936x transceiver via a remote connection.
 +
 +  - Create IIO IP Network context. Instead of ip:xxx.xxx.xxx.xxx it'll also accept usb:XX.XX.X
 +  - Get the AD936x PHY device structure
 +  - Set the TX LO frequency (see [[resources:tools-software:linux-drivers:iio-transceiver:ad9361|AD9361 device driver documentation]]) 
 +  - Set RX baseband rate
 + 
 +\\
 +<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 =====
 +
 +  - Get the RX capture device structure
 +  - Get the IQ input channels
 +  - Enable I and Q channel
 +  - Create the RX buffer
 +  - Fill the buffer 
 +  - Process samples
 +
 +\\
 +
 +<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

Page Tools