From d372569b45b7ce862d2ed2db192eead861806251 Mon Sep 17 00:00:00 2001 From: pwpiwi Date: Thu, 7 Sep 2017 09:33:32 +0200 Subject: [PATCH] FPGA changes ISO14443B: * slightly increase reader field strength * increase sensitivity when reading, allowing increased reading distance --- fpga/fpga_hf.bit | Bin 42175 -> 42175 bytes fpga/hi_read_rx_xcorr.v | 31 +++++++++++++++++-------------- fpga/hi_read_tx.v | 16 +++++++++------- 3 files changed, 26 insertions(+), 21 deletions(-) diff --git a/fpga/fpga_hf.bit b/fpga/fpga_hf.bit index b9f2e6292e42801a73b57aa3e43dff00191ec8b9..bd8cf8e7dcf7ae80756e29f2417a94da7e9dd290 100644 GIT binary patch literal 42175 zcmeIb4RjROl`gvbRJB}Ex9CDZM)6-tEt#}&BQ+An1Y@a?6^{~=pd?O)o0~Pa?J&8# zJkN}rnROpCcYcmqvT1%C+76Q;xt`nxlSJ__xs7nlUjl_JI|9qL;$bqx<5YpkplwyTe-&)?qP{`TJIh^k{H_kTp8yJ^msdjIp? z|7q=)7WUqI_ZR6ixg>1ExM&8^^um;&9sK9Q%jfK zoLaVM3H<@l&fZJ-dF&gX{Zfi#h={IAh0^@5kqTKMk{t_EZEf`b8*S|0@*-V*_Dhq} zR8LhDl9&w$Rwzqfrq9a{rDSeut*%HtUn4bNGfx}Lt~H13S76ED-_GIUZ2d*$|%cTQnT*xaVu 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It should +// be safe to assume that a tag will not be able to modulate the carrier signal by more than 25%. +// 32 * 255 * 0,25 = 2040, which can be held in 11 bits. Add 1 bit for sign. +reg signed [11:0] corr_i_accum; +reg signed [11:0] corr_q_accum; +// we will report maximum 8 significant bits reg signed [7:0] corr_i_out; reg signed [7:0] corr_q_out; // clock and frame signal for communication to ARM @@ -99,16 +102,16 @@ begin begin if(snoop) begin - // Send only 7 most significant bits of tag signal (signed), LSB is reader signal: - corr_i_out <= {corr_i_accum[13:7], after_hysteresis_prev_prev}; - corr_q_out <= {corr_q_accum[13:7], after_hysteresis_prev}; + // Send 7 most significant bits of tag signal (signed), plus 1 bit reader signal + corr_i_out <= {corr_i_accum[11:5], after_hysteresis_prev_prev}; + corr_q_out <= {corr_q_accum[11:5], after_hysteresis_prev}; after_hysteresis_prev_prev <= after_hysteresis; end else begin - // 8 most significant bits of tag signal - corr_i_out <= corr_i_accum[13:6]; - corr_q_out <= corr_q_accum[13:6]; + // 8 bits of tag signal + corr_i_out <= corr_i_accum[11:4]; + corr_q_out <= corr_q_accum[11:4]; end corr_i_accum <= adc_d; diff --git a/fpga/hi_read_tx.v b/fpga/hi_read_tx.v index f12e64eb..fc309cde 100644 --- a/fpga/hi_read_tx.v +++ b/fpga/hi_read_tx.v @@ -24,33 +24,36 @@ module hi_read_tx( output dbg; input shallow_modulation; +// low frequency outputs, not relevant +assign pwr_lo = 1'b0; +assign pwr_oe2 = 1'b0; + // The high-frequency stuff. For now, for testing, just bring out the carrier, // and allow the ARM to modulate it over the SSP. reg pwr_hi; reg pwr_oe1; -reg pwr_oe2; reg pwr_oe3; reg pwr_oe4; + always @(ck_1356megb or ssp_dout or shallow_modulation) begin if(shallow_modulation) begin pwr_hi <= ck_1356megb; - pwr_oe1 <= ~ssp_dout; - pwr_oe2 <= ~ssp_dout; - pwr_oe3 <= ~ssp_dout; - pwr_oe4 <= 1'b0; + pwr_oe1 <= 1'b0; + pwr_oe3 <= 1'b0; + pwr_oe4 <= ~ssp_dout; end else begin pwr_hi <= ck_1356megb & ssp_dout; pwr_oe1 <= 1'b0; - pwr_oe2 <= 1'b0; pwr_oe3 <= 1'b0; pwr_oe4 <= 1'b0; end end + // Then just divide the 13.56 MHz clock down to produce appropriate clocks // for the synchronous serial port. @@ -83,7 +86,6 @@ end assign ssp_din = after_hysteresis; -assign pwr_lo = 1'b0; assign dbg = ssp_din; endmodule -- 2.39.2