From 706545cb6c084d8595e9ffe53fd623b8dfc49c12 Mon Sep 17 00:00:00 2001 From: eb Date: Wed, 17 Jan 2007 22:44:13 +0000 Subject: Applied patch from Brett Trotter that stuffs zeros into the head of the tx signal processing pipeline when the Tx FIFO is empty. This results in the DACs outputing zeros when there's no data, unless the tx pipeline is disabled on the host. git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4287 221aa14e-8319-0410-a670-987f0aec2ac5 --- sdr_lib/tx_buffer.v | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) (limited to 'sdr_lib') diff --git a/sdr_lib/tx_buffer.v b/sdr_lib/tx_buffer.v index ff8fd839d..63202c9df 100644 --- a/sdr_lib/tx_buffer.v +++ b/sdr_lib/tx_buffer.v @@ -66,20 +66,20 @@ module tx_buffer load_next <= #1 4'd0; end else - if((load_next != channels) & !tx_empty) + if(load_next != channels) begin load_next <= #1 load_next + 4'd1; case(load_next) - 4'd0 : tx_i_0 <= #1 fifodata; - 4'd1 : tx_q_0 <= #1 fifodata; - 4'd2 : tx_i_1 <= #1 fifodata; - 4'd3 : tx_q_1 <= #1 fifodata; - 4'd4 : tx_i_2 <= #1 fifodata; - 4'd5 : tx_q_2 <= #1 fifodata; - 4'd6 : tx_i_3 <= #1 fifodata; - 4'd7 : tx_q_3 <= #1 fifodata; + 4'd0 : tx_i_0 <= #1 tx_empty ? 16'd0 : fifodata; + 4'd1 : tx_q_0 <= #1 tx_empty ? 16'd0 : fifodata; + 4'd2 : tx_i_1 <= #1 tx_empty ? 16'd0 : fifodata; + 4'd3 : tx_q_1 <= #1 tx_empty ? 16'd0 : fifodata; + 4'd4 : tx_i_2 <= #1 tx_empty ? 16'd0 : fifodata; + 4'd5 : tx_q_2 <= #1 tx_empty ? 16'd0 : fifodata; + 4'd6 : tx_i_3 <= #1 tx_empty ? 16'd0 : fifodata; + 4'd7 : tx_q_3 <= #1 tx_empty ? 16'd0 : fifodata; endcase // case(load_next) - end // if ((load_next != channels) & !tx_empty) + end // if (load_next != channels) else if(txstrobe & (load_next == channels)) begin load_next <= #1 4'd0; -- cgit v1.2.3