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fgpa changes from official repo. Had to split felica into its own image. Leading to three bit files created.

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iceman1001 2020-07-02 11:47:46 +02:00
commit 8df14408b8
7 changed files with 191 additions and 203 deletions
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119
fpga/hi_simulate.v
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@ -17,82 +17,105 @@
//-----------------------------------------------------------------------------
module hi_simulate(
pck0, ck_1356meg, ck_1356megb,
ck_1356meg,
pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4,
adc_d, adc_clk,
ssp_frame, ssp_din, ssp_dout, ssp_clk,
cross_hi, cross_lo,
dbg,
mod_type
);
input pck0, ck_1356meg, ck_1356megb;
input ck_1356meg;
output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4;
input [7:0] adc_d;
output adc_clk;
input ssp_dout;
output ssp_frame, ssp_din, ssp_clk;
input cross_hi, cross_lo;
output dbg;
input [2:0] mod_type;
input [3:0] mod_type;
// Power amp goes between LOW and tri-state, so pwr_hi (and pwr_lo) can
// always be low.
assign pwr_hi = 1'b0;
assign pwr_lo = 1'b0;
assign pwr_hi = 1'b0; // HF antenna connected to GND
assign pwr_lo = 1'b0; // LF antenna connected to GND
// This one is all LF, so doesn't matter
assign pwr_oe2 = 1'b0;
assign adc_clk = ck_1356meg;
assign dbg = ssp_frame;
// The comparator with hysteresis on the output from the peak detector.
reg after_hysteresis;
assign adc_clk = ck_1356meg;
reg [11:0] has_been_low_for;
always @(negedge adc_clk)
begin
if(& adc_d[7:5]) after_hysteresis = 1'b1;
else if(~(| adc_d[7:5])) after_hysteresis = 1'b0;
if (& adc_d[7:5]) after_hysteresis <= 1'b1; // if (adc_d >= 224)
else if (~(| adc_d[7:5])) after_hysteresis <= 1'b0; // if (adc_d <= 31)
if (adc_d >= 224)
begin
has_been_low_for <= 12'd0;
end
else
begin
if (has_been_low_for == 12'd4095)
begin
has_been_low_for <= 12'd0;
after_hysteresis <= 1'b1;
end
else
begin
has_been_low_for <= has_been_low_for + 1;
end
end
end
// Divide 13.56 MHz to produce various frequencies for SSP_CLK
// and modulation. 11 bits allow for factors of up to /128.
reg [10:0] ssp_clk_divider;
// and modulation.
reg [8:0] ssp_clk_divider;
always @(posedge adc_clk)
always @(negedge adc_clk)
ssp_clk_divider <= (ssp_clk_divider + 1);
reg ssp_clk;
always @(negedge adc_clk)
begin
if(mod_type == 3'b101)
// Get bit every at 53kHz (every 8th carrier bit of 424kHz)
ssp_clk <= ssp_clk_divider[7];
else if(mod_type == 3'b010)
if (mod_type == `FPGA_HF_SIMULATOR_MODULATE_424K_8BIT)
// Get bit every at 53KHz (every 8th carrier bit of 424kHz)
ssp_clk <= ~ssp_clk_divider[7];
else if (mod_type == `FPGA_HF_SIMULATOR_MODULATE_212K)
// Get next bit at 212kHz
ssp_clk <= ssp_clk_divider[5];
ssp_clk <= ~ssp_clk_divider[5];
else
// Get next bit at 424kHz
ssp_clk <= ssp_clk_divider[4];
ssp_clk <= ~ssp_clk_divider[4];
end
// Divide SSP_CLK by 8 to produce the byte framing signal; the phase of
// this is arbitrary, because it's just a bitstream.
// One nasty issue, though: I can't make it work with both rx and tx at
// once. The phase wrt ssp_clk must be changed. TODO to find out why
// that is and make a better fix.
reg [2:0] ssp_frame_divider_to_arm;
always @(posedge ssp_clk)
ssp_frame_divider_to_arm <= (ssp_frame_divider_to_arm + 1);
reg [2:0] ssp_frame_divider_from_arm;
always @(negedge ssp_clk)
ssp_frame_divider_from_arm <= (ssp_frame_divider_from_arm + 1);
// Produce the byte framing signal; the phase of this signal
// is arbitrary, because it's just a bit stream in this module.
reg ssp_frame;
always @(ssp_frame_divider_to_arm or ssp_frame_divider_from_arm or mod_type)
if(mod_type == 3'b000) // not modulating, so listening, to ARM
ssp_frame = (ssp_frame_divider_to_arm == 3'b000);
always @(negedge adc_clk)
begin
if (mod_type == `FPGA_HF_SIMULATOR_MODULATE_212K)
begin
if (ssp_clk_divider[8:5] == 4'd1)
ssp_frame <= 1'b1;
if (ssp_clk_divider[8:5] == 4'd5)
ssp_frame <= 1'b0;
end
else
ssp_frame = (ssp_frame_divider_from_arm == 3'b000);
begin
if (ssp_clk_divider[7:4] == 4'd1)
ssp_frame <= 1'b1;
if (ssp_clk_divider[7:4] == 4'd5)
ssp_frame <= 1'b0;
end
end
// Synchronize up the after-hysteresis signal, to produce DIN.
reg ssp_din;
@ -101,29 +124,25 @@ always @(posedge ssp_clk)
// Modulating carrier frequency is fc/64 (212kHz) to fc/16 (848kHz). Reuse ssp_clk divider for that.
reg modulating_carrier;
always @(mod_type or ssp_clk or ssp_dout)
if(mod_type == 3'b000)
always @(*)
if(mod_type == `FPGA_HF_SIMULATOR_NO_MODULATION)
modulating_carrier <= 1'b0; // no modulation
else if(mod_type == 3'b001)
else if(mod_type == `FPGA_HF_SIMULATOR_MODULATE_BPSK)
modulating_carrier <= ssp_dout ^ ssp_clk_divider[3]; // XOR means BPSK
else if(mod_type == 3'b010)
else if(mod_type == `FPGA_HF_SIMULATOR_MODULATE_212K)
modulating_carrier <= ssp_dout & ssp_clk_divider[5]; // switch 212kHz subcarrier on/off
else if(mod_type == 3'b100 || mod_type == 3'b101)
else if(mod_type == `FPGA_HF_SIMULATOR_MODULATE_424K || mod_type == `FPGA_HF_SIMULATOR_MODULATE_424K_8BIT)
modulating_carrier <= ssp_dout & ssp_clk_divider[4]; // switch 424kHz modulation on/off
else
modulating_carrier <= 1'b0; // yet unused
// This one is all LF, so doesn't matter
assign pwr_oe2 = modulating_carrier;
// Toggle only one of these, since we are already producing much deeper
// Load modulation. Toggle only one of these, since we are already producing much deeper
// modulation than a real tag would.
assign pwr_oe1 = modulating_carrier;
assign pwr_oe4 = modulating_carrier;
assign pwr_oe1 = 1'b0; // 33 Ohms Load
assign pwr_oe4 = modulating_carrier; // 33 Ohms Load
// This one is always on, so that we can watch the carrier.
assign pwr_oe3 = 1'b0;
assign dbg = ssp_din;
assign pwr_oe3 = 1'b0; // 10k Load
endmodule