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university:tools:pluto:hacking:power_amp [10 Jul 2019 23:30] – [VDD_GPO] Robin Getzuniversity:tools:pluto:hacking:power_amp [13 Jul 2019 02:19] – [Test Results] Robin Getz
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 More information about the [[adi>AD9363]] can be found on the product page. More information about the [[adi>AD9363]] can be found on the product page.
  
-===== ADLM-PLUTO implementation =====+===== ADALM-PLUTO implementation =====
  
 ==== VDD_GPO ==== ==== VDD_GPO ====
Line 83: Line 83:
  
 {{ :university:tools:pluto:hacking:gpo_rx_tx.png?600 |}} {{ :university:tools:pluto:hacking:gpo_rx_tx.png?600 |}}
 +
 +<WRAP round help>While this shows the Rx/Tx switching in 30-35ms or so, this is based on **software** control over SPI, running in an interpreted bash shell. Doing things in a C application, would make things faster, and doing things via pin control (via a state machine in the FPGA) can make things sub ~30 μs between Rx and Tx swaps to handle slotted specifications like LTE. IF you need things to go faster - just ask.
 +</WRAP>
 +
 +OK, someone asked for the C code - it's pretty trivial, just longer. You will need to change the uri, and put in proper error checking.
 +
 +<code>
 +#include <stdio.h>
 +#include <iio.h>
 +#include <unistd.h>
 +#include <stdio.h>
 +#include <signal.h>
 +
 +
 +volatile sig_atomic_t stop = 0;
 +
 +void inthand(int signum) {
 +        stop = 1;
 +}
 +
 +int main(int argc, char **argv)
 +{
 +        struct iio_context *ctx;
 +        struct iio_device *dev;
 +        struct iio_channel *ch;
 +        const char* val_str;
 +        ssize_t ret = 0;
 +        char buf[256];
 +
 +        signal(SIGINT, inthand);
 +
 +        /* Create IIO Context */
 +        ctx = iio_create_context_from_uri("usb:1.3.5");
 +
 +        /* Find IIO device in current context */
 +        dev = iio_context_find_device(ctx, "ad9361-phy");
 +
 +        /* Write into the IIO debug attributes */
 +        iio_device_debug_attr_write_bool(dev, "adi,frequency-division-duplex-mode-enable", 0);
 +        iio_device_debug_attr_write_bool(dev, "adi,gpo0-slave-rx-enable", 1);
 +        iio_device_debug_attr_write_bool(dev, "adi,gpo1-slave-tx-enable", 1);
 +        iio_device_debug_attr_write_bool(dev, "initialize", 1);
 +        
 +        while (!stop) {
 +                ret++;
 +                iio_device_attr_write(dev, "ensm_mode", "rx");
 +                iio_device_attr_write(dev, "ensm_mode", "tx");
 +        }
 +        iio_context_destroy(ctx);
 +        printf("iteration = %li\n", ret);
 +        return EXIT_SUCCESS;
 +}
 +</code>
 +
 +Over USB, you get:<xterm>
 + time ./foo 
 +^Citteration = 2693
 +
 +real 0m5.283s
 +</xterm>
 +
 +or about 0.980876346 ms per Rx/Tx slot.
 ===== Testing in IIO Oscilloscope ===== ===== Testing in IIO Oscilloscope =====
  
university/tools/pluto/hacking/power_amp.txt · Last modified: 16 Jul 2019 20:15 by Robin Getz

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