Hi,
I encount some problem when I run the OpenBTS source code with usrp.
First, I have made some check of the usrp to ensure that it work in the right state, as follows:
xfered 1.34e+08 bytes in 4.19 seconds. 3.2e+07 bytes/sec. cpu time = 0.62
noverruns = 0
which: 0
interp: 16
rf_freq: -1
amp: 10000.000000
nsamples: 3.2e+07
Subdevice name is Flex 1800 Tx MIMO B
Subdevice freq range: (1.6e+09, 2e+09)
mux: 0x000098
baseband rate: 8e+06
target_freq: 1800000000.000000
ok: true
r.baseband_freq: 1804000000.000000
r.dxc_freq: -4000000.000000
r.residual_freq: 0.000000
r.inverted: 0
tx_underrun
tx_underrun
tx_underrun
tx_underrun
tx_underrun
tx_underrun
tx_underrun
tx_underrun
tx_underrun
xfered 3.2e+07 bytes in 1.18 seconds. 2.715e+07 bytes/sec. cpu time = 0.132
9 underruns
But when I run the OpenBTS code, it will return false in "m_uRx->read_io(1)" which is in the end of the following code.
(after the function "compute_regs", freq=1739800000.000000, R=3407936, control=5228836, N=4208152, actual_freq=1740000000.000000)
(I use the operating band "DCS1800")
usrp_standard_rx_sptr m_uRx;
bool USRPDevice::rx_setFreq(double freq, double *actual_freq)
{
unsigned R, control, N;
if (!compute_regs(freq, &R, &control, &N, actual_freq))
return false;
if (R==0)
return false;
m_uRx->_write_spi(0,SPI_ENABLE_RX_B,SPI_FMT_MSB | SPI_FMT_HDR_0,write_it((R & ~0x3) | 1));
m_uRx->_write_spi(0,SPI_ENABLE_RX_B,SPI_FMT_MSB | SPI_FMT_HDR_0,write_it((control & ~0x3) | 0));
usleep(10000);
m_uRx->_write_spi(0,SPI_ENABLE_RX_B,SPI_FMT_MSB | SPI_FMT_HDR_0, write_it((N & ~0x3) | 2));
if (m_uRx->read_io(1) & PLL_LOCK_DETECT) return true;
if (m_uRx->read_io(1) & PLL_LOCK_DETECT) return true;
return false;
}
And I try to use the mobile phone to find the network make up by the usrp, but I can only find the networks "中国移动" and "中国联通".(The sim card is belong to "中国移动"). (But I have add the mobile phone’s IMIS to “sip.conf” in etc/Asterisk/ and add something like “exten => 2103,1,Macro(dialGSM,310410186585291)” to the “extensions.conf” )
I don't know what's wrong , could you give me some advice?
Thanks very much!
Best wishes:)
Pingping
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