[hpsdr] Hermes input attenuator enable bit not documented ?
Phil Harman
phil at pharman.org
Mon Jan 21 03:10:05 PST 2013
Hi Andrea,
You are quite correct and apologies for not including this in the protocol
documentation.
I've add this to the protocol and V1.46 is now in SVN.
73 Phil...VK6APH
-----Original Message-----
From: Andrea Montefusco
Sent: Monday, January 21, 2013 8:06 AM
To: HPSDR list
Subject: [hpsdr] Hermes input attenuator enable bit not documented ?
***** High Performance Software Defined Radio Discussion List *****
Hi all,
maybe it has already been spotted and reported, but it seems to me in
protocol doc version 1.45 a
bit of information is missing.
During testing I am doing in order to extend ghpsdr3-alex hpsdr-server
functionality, I was unable
to activate the Hermes attenuator (I have a TAPR Hermes inside an ANAN-10
case and PA).
So, browsing the Verilog code (Hermes.v), I discovered that, aside the value
of attenuation, there
is a additional bit, named Hermes_atten_enable, that is decoded into the
register 0x14-C4:
if (IF_Rx_ctrl_0[7:1] == 7'b0001_010)
begin
IF_Line_In_Gain <= IF_Rx_ctrl_2[4:0]; // decode line-in gain setting
Hermes_atten <= IF_Rx_ctrl_4[4:0]; // decode input attenuation
setting
Hermes_atten_enable <= IF_Rx_ctrl_4[5]; // decode Hermes attenuator
enable/disable
end
looking to the code below, I believe (but may be wrong due my poor knowledge
of Verilog) that the
attenuation value is kept in account as specified, but only if that enable
bit is set.
Otherwise the Preamp bit (0x00-C3) wins and the DAT attenuator is fully
disabled.
If even Preamp is zero, the DAT is set to -20 dB.
assign atten_data = Hermes_atten_enable ? Hermes_atten : (Preamp ? 5'b0_0000
: 5'b1_0100);
Now, whilst all the above could be understood from previous messages in
list, I think the doc should
be changed accordingly.
*am*
---------------------------------------------------------
Andrea Montefusco iw0hdv http://www.montefusco.com
tel: +393356992791 fax: +390623318709
---------------------------------------------------------
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