Dear all,
recently, we purchased a X410. According to the
[manual](https://www.ni.com/pdf/manuals/378493a), the USRP supports a maximum
I/Q samples rate of up to 491.52 MSps. Using the UHD API however, warnings are
printed to stdout that the rate is set to 245.76 MSps.
In the following, you can find a MWE:
```cpp
#include <uhd/usrp/multi_usrp.hpp>
#include <iostream>
int main() {
uhd::device_addr_t addr = uhd::device_addr_t("addr=localhost");
uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(addr);
usrp->set_rx_rate(491.52e6); // max. value deifned in
https://www.ni.com/pdf/manuals/378493a
usrp->set_tx_rate(491.52e6); // max. value deifned in
https://www.ni.com/pdf/manuals/378493a
std::cout << "Rx rates range from " << usrp->get_rx_rates().start() << " to
" << usrp->get_rx_rates().stop()<< std::endl;
std::cout << "Tx rates range from " << usrp->get_tx_rates().start() << " to
" << usrp->get_tx_rates().stop()<< std::endl;
std::cout << "Current rate is (rx): " << usrp->get_rx_rate() << std::endl;
std::cout << "Current rate is (tx): " << usrp->get_tx_rate() << std::endl;
}
```
After building, the following is printed:
```bash
root@ni-x4xx-323F74C:~/uhd-evaluation/debug/build# ./set_usrp_rates
[INFO] [UHD] linux; GNU C++ version 9.2.0; Boost_107100; UHD_4.1.0.5-0-g18f5f9a4
[INFO] [MPMD] Initializing 1 device(s) in parallel with args:
mgmt_addr=127.0.0.1,type=x4xx,product=x410,serial=323F74C,fpga=X4_200,claimed=False,addr=localhost
[INFO] [MPM.PeriphManager] init() called with device args
`fpga=X4_200,mgmt_addr=127.0.0.1,product=x410,clock_source=internal,time_source=internal'.
[WARNING] [MPM.RPCServer] A timeout event occured!
[INFO] [MPM.PeriphManager] init() called with device args
`fpga=X4_200,mgmt_addr=127.0.0.1,product=x410,clock_source=internal,time_source=internal'.
[WARNING] [MULTI_USRP] Could not set RX rate to 491.520 MHz. Actual rate is
245.760 MHz
[WARNING] [MULTI_USRP] Could not set RX rate to 491.520 MHz. Actual rate is
245.760 MHz
[WARNING] [MULTI_USRP] Could not set RX rate to 491.520 MHz. Actual rate is
245.760 MHz
[WARNING] [MULTI_USRP] Could not set RX rate to 491.520 MHz. Actual rate is
245.760 MHz
[WARNING] [MULTI_USRP] Could not set TX rate to 491.520 MHz. Actual rate is
245.760 MHz
[WARNING] [MULTI_USRP] Could not set TX rate to 491.520 MHz. Actual rate is
245.760 MHz
[WARNING] [MULTI_USRP] Could not set TX rate to 491.520 MHz. Actual rate is
245.760 MHz
[WARNING] [MULTI_USRP] Could not set TX rate to 491.520 MHz. Actual rate is
245.760 MHz
Rx rates range from 240941 to 2.4576e+08
Tx rates range from 240941 to 2.4576e+08
Current rate is (rx): 2.4576e+08
Current rate is (tx): 2.4576e+08
```
The same can be observed using the `txrx_loopback_to_file` example. Can you
help me on that? Thank you in advance 🙂
**Version information**:
```bash
root@ni-x4xx-323F74C:/usr/lib/uhd/examples# uhd_config_info --print-all
UHD 4.1.0.5-0-g18f5f9a4
Build date: Mon, 06 Dec 2021 19:14:55
C compiler: GNU 9.2.0
C++ compiler: GNU 9.2.0
C flags: -DBOOST_ERROR_CODE_HEADER_ONLY -DBOOST_ASIO_DISABLE_STD_STRING_VIEW
-DBOOST_ASIO_DISABLE_STD_EXPERIMENTAL_STRING_VIEW -DHAVE_CONFIG_H
-DUHD_LOG_MIN_LEVEL=1 -DUHD_LOG_CONSOLE_LEVEL=2 -DUHD_LOG_FILE_LEVEL=2
-DUHD_LOG_CONSOLE_COLOR
--sysroot=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot
-O2 -pipe -g -feliminate-unused-debug-types
-fmacro-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0=/usr/src/debug/uhd/4.1.0.5+rc2-r0
-fdebug-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0=/usr/src/debug/uhd/4.1.0.5+rc2-r0
-fdebug-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot=
-fdebug-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot-native=
--sysroot=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot
C++ flags: -DBOOST_ERROR_CODE_HEADER_ONLY -DBOOST_ASIO_DISABLE_STD_STRING_VIEW
-DBOOST_ASIO_DISABLE_STD_EXPERIMENTAL_STRING_VIEW -DHAVE_CONFIG_H
-DUHD_LOG_MIN_LEVEL=1 -DUHD_LOG_CONSOLE_LEVEL=2 -DUHD_LOG_FILE_LEVEL=2
-DUHD_LOG_CONSOLE_COLOR
--sysroot=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot
-O2 -pipe -g -feliminate-unused-debug-types
-fmacro-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0=/usr/src/debug/uhd/4.1.0.5+rc2-r0
-fdebug-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0=/usr/src/debug/uhd/4.1.0.5+rc2-r0
-fdebug-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot=
-fdebug-prefix-map=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot-native=
-fvisibility-inlines-hidden
--sysroot=/__w/790/build/tmp-glibc/work/aarch64-oe-linux/uhd/4.1.0.5+rc2-r0/recipe-sysroot
-fvisibility=hidden -fvisibility-inlines-hidden
Enabled components: LibUHD, LibUHD - C API, LibUHD - Python API, Examples,
Utils, Tests, MPMD, N300, N320, E320, E300, X400, OctoClock
Install prefix: /usr
Boost version: 1.71
Libusb version: N/A
Library path: /usr/lib
Package path: /usr
Images directory: /usr/share/uhd/images
ABI version string: 4.1.0
```
Kind regards,
Tobias
Barkhausen Institut
www.barkhauseninstitut.org
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