pespin has uploaded this change for review. ( 
https://gerrit.osmocom.org/c/osmo-trx/+/16878 )


Change subject: lms: Initial multi-arfcn support
......................................................................

lms: Initial multi-arfcn support

With current state multi-arfcn can be used (eg. I can place a call
between 2 phones using TRX1 and sustain for as long as wanted), but from
time to time (around every 20seconds), a burst of Tx packed dropped
events from LimeSuite appears.

LimeNet-micro coefficients have yet not been tested.

Change-Id: I7e67d90a8126546eeeeba376f816ec5d158d4712
---
M Transceiver52M/device/lms/LMSDevice.cpp
1 file changed, 17 insertions(+), 7 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-trx refs/changes/78/16878/1

diff --git a/Transceiver52M/device/lms/LMSDevice.cpp 
b/Transceiver52M/device/lms/LMSDevice.cpp
index d9cc371..7d67158 100644
--- a/Transceiver52M/device/lms/LMSDevice.cpp
+++ b/Transceiver52M/device/lms/LMSDevice.cpp
@@ -68,17 +68,21 @@
        double max_tx_gain;
        /* Sample rate coef (without having TX/RX samples per symbol into 
account) */
        double rate;
+       /* Sample rate coef (without having TX/RX samples per symbol into 
account), if multi-arfcn is enabled */
+       double rate_multiarfcn;
        /* Coefficient multiplied by TX sample rate in order to shift Tx time */
        double ts_offset_coef;
+       /* Coefficient multiplied by TX sample rate in order to shift Tx time, 
if multi-arfcn is enabled */
+       double ts_offset_coef_multiarfcn;
        /* Device Name Prefix as presented by LimeSuite API LMS_GetDeviceInfo() 
*/
        std::string name_prefix;
 };

 static const std::map<enum lms_dev_type, struct dev_desc> dev_param_map {
-       { LMS_DEV_SDR_USB,   { true,  true,  73.0, GSMRATE, 8.9e-5, 
LMS_DEV_SDR_USB_PREFIX_NAME } },
-       { LMS_DEV_SDR_MINI,  { false, true,  66.0, GSMRATE, 8.9e-5, 
LMS_DEV_SDR_MINI_PREFIX_NAME } },
-       { LMS_DEV_NET_MICRO, { true,  false, 71.0, GSMRATE, 8.9e-5, 
LMS_DEV_NET_MICRO_PREFIX_NAME } },
-       { LMS_DEV_UNKNOWN,   { true,  true,  73.0, GSMRATE, 8.9e-5, "UNKNOWN" } 
},
+       { LMS_DEV_SDR_USB,   { true,  true,  73.0, GSMRATE, MCBTS_SPACING, 
8.9e-5, 7.9e-5, LMS_DEV_SDR_USB_PREFIX_NAME } },
+       { LMS_DEV_SDR_MINI,  { false, true,  66.0, GSMRATE, MCBTS_SPACING, 
8.9e-5, 8.2e-5, LMS_DEV_SDR_MINI_PREFIX_NAME } },
+       { LMS_DEV_NET_MICRO, { true,  false, 71.0, GSMRATE, MCBTS_SPACING, 
8.9e-5, 7.9e-5, LMS_DEV_NET_MICRO_PREFIX_NAME } },
+       { LMS_DEV_UNKNOWN,   { true,  true,  73.0, GSMRATE, MCBTS_SPACING, 
8.9e-5, 7.9e-5, "UNKNOWN" } },
 };

 static enum lms_dev_type parse_dev_type(lms_device_t *m_lms_dev)
@@ -294,7 +298,10 @@
                goto out_close;
        print_range("Sample Rate", &range_sr);

-       sr_host = dev_desc.rate * tx_sps;
+       if (iface == MULTI_ARFCN)
+               sr_host = dev_desc.rate_multiarfcn * tx_sps;
+       else
+               sr_host = dev_desc.rate * tx_sps;
        LOGC(DDEV, INFO) << "Setting sample rate to " << sr_host << " " << 
tx_sps;
        if (LMS_SetSampleRate(m_lms_dev, sr_host, 32) < 0)
                goto out_close;
@@ -303,7 +310,10 @@
                goto out_close;
        LOGC(DDEV, INFO) << "Sample Rate: Host=" << sr_host << " RF=" << sr_rf;

-       ts_offset = static_cast<TIMESTAMP>(dev_desc.ts_offset_coef * sr_host);
+       if (iface == MULTI_ARFCN)
+               ts_offset = 
static_cast<TIMESTAMP>(dev_desc.ts_offset_coef_multiarfcn * sr_host);
+       else
+               ts_offset = static_cast<TIMESTAMP>(dev_desc.ts_offset_coef * 
sr_host);

        /* configure antennas */
        if (!set_antennas()) {
@@ -311,7 +321,7 @@
                goto out_close;
        }

-       return NORMAL;
+       return iface == MULTI_ARFCN ? MULTI_ARFCN : NORMAL;

 out_close:
        LOGC(DDEV, FATAL) << "Error in LMS open, closing: " << 
LMS_GetLastErrorMessage();

--
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Gerrit-Project: osmo-trx
Gerrit-Branch: master
Gerrit-Change-Id: I7e67d90a8126546eeeeba376f816ec5d158d4712
Gerrit-Change-Number: 16878
Gerrit-PatchSet: 1
Gerrit-Owner: pespin <pes...@sysmocom.de>
Gerrit-MessageType: newchange

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