fpga/fpga_felica.v

   1 //-----------------------------------------------------------------------------
   2 // The FPGA is responsible for interfacing between the A/D, the coil drivers,
   3 // and the ARM. In the low-frequency modes it passes the data straight
   4 // through, so that the ARM gets raw A/D samples over the SSP. In the high-
   5 // frequency modes, the FPGA might perform some demodulation first, to
   6 // reduce the amount of data that we must send to the ARM.
   7 //
   8 // I am not really an FPGA/ASIC designer, so I am sure that a lot of this
   9 // could be improved.
  10 //
  11 // Jonathan Westhues, March 2006
  12 // Added ISO14443-A support by Gerhard de Koning Gans, April 2008
  13 // iZsh <izsh at fail0verflow.com>, June 2014
  14 // Piwi, Feb 2019
  15 //-----------------------------------------------------------------------------
  16
  17
  18 // Defining commands, modes and options. This must be aligned to the definitions in fpgaloader.h
  19 // Note: the definitions here are without shifts
  20
  21 // Commands:
  22 `define FPGA_CMD_SET_CONFREG                        1
  23 `define FPGA_CMD_TRACE_ENABLE                       2
  24
  25 // Major modes:
  26 `define FPGA_MAJOR_MODE_HF_READER                   0
  27 `define FPGA_MAJOR_MODE_HF_SIMULATOR                1
  28 `define FPGA_MAJOR_MODE_HF_ISO14443A                2
  29 `define FPGA_MAJOR_MODE_HF_SNIFF                    3
  30 `define FPGA_MAJOR_MODE_HF_ISO18092                 4
  31 `define FPGA_MAJOR_MODE_HF_GET_TRACE                5
  32 `define FPGA_MAJOR_MODE_OFF                         7
  33
  34 // Options for the generic HF reader
  35 `define FPGA_HF_READER_MODE_RECEIVE_IQ              0
  36 `define FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE       1
  37 `define FPGA_HF_READER_MODE_RECEIVE_PHASE           2
  38 `define FPGA_HF_READER_MODE_SEND_FULL_MOD           3
  39 `define FPGA_HF_READER_MODE_SEND_SHALLOW_MOD        4
  40 `define FPGA_HF_READER_MODE_SNIFF_IQ                5
  41 `define FPGA_HF_READER_MODE_SNIFF_AMPLITUDE         6
  42 `define FPGA_HF_READER_MODE_SNIFF_PHASE             7
  43 `define FPGA_HF_READER_MODE_SEND_JAM                8
  44
  45 `define FPGA_HF_READER_SUBCARRIER_848_KHZ           0
  46 `define FPGA_HF_READER_SUBCARRIER_424_KHZ           1
  47 `define FPGA_HF_READER_SUBCARRIER_212_KHZ           2
  48
  49 // Options for the HF simulated tag, how to modulate
  50 `define FPGA_HF_SIMULATOR_NO_MODULATION             0
  51 `define FPGA_HF_SIMULATOR_MODULATE_BPSK             1
  52 `define FPGA_HF_SIMULATOR_MODULATE_212K             2
  53 `define FPGA_HF_SIMULATOR_MODULATE_424K             4
  54 `define FPGA_HF_SIMULATOR_MODULATE_424K_8BIT        5
  55
  56 // Options for ISO14443A
  57 `define FPGA_HF_ISO14443A_SNIFFER                   0
  58 `define FPGA_HF_ISO14443A_TAGSIM_LISTEN             1
  59 `define FPGA_HF_ISO14443A_TAGSIM_MOD                2
  60 `define FPGA_HF_ISO14443A_READER_LISTEN             3
  61 `define FPGA_HF_ISO14443A_READER_MOD                4
  62
  63 //options for ISO18092 / Felica
  64 `define FPGA_HF_ISO18092_FLAG_NOMOD                 1 // 0001 disable modulation module
  65 `define FPGA_HF_ISO18092_FLAG_424K                  2 // 0010 should enable 414k mode (untested). No autodetect
  66 `define FPGA_HF_ISO18092_FLAG_READER                4 // 0100 enables antenna power, to act as a reader instead of tag
  67
  68 `include "hi_reader.v"
  69 `include "hi_simulate.v"
  70 //`include "hi_iso14443a.v"
  71 `include "hi_sniffer.v"
  72 `include "util.v"
  73 `include "hi_flite.v"
  74 `include "hi_get_trace.v"
  75
  76 module fpga_felica(
  77     input spck, output miso, input mosi, input ncs,
  78     input pck0, input ck_1356meg, input ck_1356megb,
  79     output pwr_lo, output pwr_hi,
  80     output pwr_oe1, output pwr_oe2, output pwr_oe3, output pwr_oe4,
  81     input [7:0] adc_d, output adc_clk, output adc_noe,
  82     output ssp_frame, output ssp_din, input ssp_dout, output ssp_clk,
  83     input cross_hi, input cross_lo,
  84     output dbg
  85 );
  86
  87 //-----------------------------------------------------------------------------
  88 // The SPI receiver. This sets up the configuration word, which the rest of
  89 // the logic looks at to determine how to connect the A/D and the coil
  90 // drivers (i.e., which section gets it). Also assign some symbolic names
  91 // to the configuration bits, for use below.
  92 //-----------------------------------------------------------------------------
  93
  94 /*
  95  Attempt to write up how its hooked up. Iceman 2020.
  96
  97  Communication between ARM / FPGA is done inside armsrc/fpgaloader.c see: function FpgaSendCommand()
  98  Send 16 bit command / data pair to FPGA
  99  The bit format is: C3 C2 C1 C0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
 100  where
 101    C is 4bit command
 102    D is 12bit data
 103
 104   shift_reg receive this 16bit frame
 105
 106
 107 -----+--------- frame layout --------------------
 108 bit  |    15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
 109 -----+-------------------------------------------
 110 cmd  |     x  x  x  x
 111 major|                          x x x
 112 opt  |                                    x x x
 113 divi |                          x x x x x x x x
 114 thres|                          x x x x x x x x
 115 -----+-------------------------------------------
 116 */
 117
 118 reg [15:0] shift_reg;
 119 reg [8:0] conf_word;
 120 reg trace_enable;
 121
 122 // We switch modes between transmitting to the 13.56 MHz tag and receiving
 123 // from it, which means that we must make sure that we can do so without
 124 // glitching, or else we will glitch the transmitted carrier.
 125 always @(posedge ncs)
 126 begin
 127     case(shift_reg[15:12])
 128         `FPGA_CMD_SET_CONFREG:  conf_word <= shift_reg[8:0];
 129         `FPGA_CMD_TRACE_ENABLE: trace_enable <= shift_reg[0];
 130     endcase
 131 end
 132
 133 always @(posedge spck)
 134 begin
 135     if(~ncs)
 136     begin
 137         shift_reg[15:1] <= shift_reg[14:0];
 138         shift_reg[0] <= mosi;
 139     end
 140 end
 141
 142 // select module (outputs) based on major mode
 143 wire [2:0] major_mode = conf_word[8:6];
 144
 145 // configuring the HF reader
 146 wire [1:0] subcarrier_frequency = conf_word[5:4];
 147 wire [3:0] minor_mode = conf_word[3:0];
 148
 149 //-----------------------------------------------------------------------------
 150 // And then we instantiate the modules corresponding to each of the FPGA's
 151 // major modes, and use muxes to connect the outputs of the active mode to
 152 // the output pins.
 153 //-----------------------------------------------------------------------------
 154
 155 // 000 - HF reader
 156 hi_reader hr(
 157     ck_1356megb,
 158     hr_pwr_lo, hr_pwr_hi, hr_pwr_oe1, hr_pwr_oe2, hr_pwr_oe3, hr_pwr_oe4,
 159     adc_d, hr_adc_clk,
 160     hr_ssp_frame, hr_ssp_din, ssp_dout, hr_ssp_clk,
 161     hr_dbg,
 162     subcarrier_frequency, minor_mode
 163 );
 164
 165 // 001 - HF simulated tag
 166 hi_simulate hs(
 167     ck_1356meg,
 168     hs_pwr_lo, hs_pwr_hi, hs_pwr_oe1, hs_pwr_oe2, hs_pwr_oe3, hs_pwr_oe4,
 169     adc_d, hs_adc_clk,
 170     hs_ssp_frame, hs_ssp_din, ssp_dout, hs_ssp_clk,
 171     hs_dbg,
 172     minor_mode
 173 );
 174
 175 // 011 - HF sniff
 176 hi_sniffer he(
 177     ck_1356megb,
 178     he_pwr_lo, he_pwr_hi, he_pwr_oe1, he_pwr_oe2, he_pwr_oe3, he_pwr_oe4,
 179     adc_d, he_adc_clk,
 180     he_ssp_frame, he_ssp_din, he_ssp_clk
 181 );
 182
 183 // 100 - HF ISO18092 FeliCa
 184 hi_flite hfl(
 185     ck_1356megb,
 186     hfl_pwr_lo, hfl_pwr_hi, hfl_pwr_oe1, hfl_pwr_oe2, hfl_pwr_oe3, hfl_pwr_oe4,
 187     adc_d, hfl_adc_clk,
 188     hfl_ssp_frame, hfl_ssp_din, ssp_dout, hfl_ssp_clk,
 189     hfl_dbg,
 190     minor_mode
 191 );
 192
 193 // 101 - HF get trace
 194 hi_get_trace gt(
 195     ck_1356megb,
 196     adc_d, trace_enable, major_mode,
 197     gt_ssp_frame, gt_ssp_din, gt_ssp_clk
 198 );
 199
 200 // Major modes:
 201 //   000 --  HF reader; subcarrier frequency and modulation depth selectable
 202 //   001 --  HF simulated tag
 203 //   010 --  HF ISO14443-A - removed for space...
 204 //   011 --  HF sniff
 205 //   100 --  HF ISO18092 FeliCa
 206 //   101 --  HF get trace
 207 //   110 --  unused
 208 //   111 --  FPGA_MAJOR_MODE_OFF
 209
 210 //                                         000           001           010     011           100            101           110   111
 211 mux8 mux_ssp_clk   (major_mode, ssp_clk,   hr_ssp_clk,   hs_ssp_clk,   1'b0,   he_ssp_clk,   hfl_ssp_clk,   gt_ssp_clk,   1'b0, 1'b0);
 212 mux8 mux_ssp_din   (major_mode, ssp_din,   hr_ssp_din,   hs_ssp_din,   1'b0,   he_ssp_din,   hfl_ssp_din,   gt_ssp_din,   1'b0, 1'b0);
 213 mux8 mux_ssp_frame (major_mode, ssp_frame, hr_ssp_frame, hs_ssp_frame, 1'b0,   he_ssp_frame, hfl_ssp_frame, gt_ssp_frame, 1'b0, 1'b0);
 214 mux8 mux_pwr_oe1   (major_mode, pwr_oe1,   hr_pwr_oe1,   hs_pwr_oe1,   1'b0,   he_pwr_oe1,   hfl_pwr_oe1,   1'b0,         1'b0, 1'b0);
 215 mux8 mux_pwr_oe2   (major_mode, pwr_oe2,   hr_pwr_oe2,   hs_pwr_oe2,   1'b0,   he_pwr_oe2,   hfl_pwr_oe2,   1'b0,         1'b0, 1'b0);
 216 mux8 mux_pwr_oe3   (major_mode, pwr_oe3,   hr_pwr_oe3,   hs_pwr_oe3,   1'b0,   he_pwr_oe3,   hfl_pwr_oe3,   1'b0,         1'b0, 1'b0);
 217 mux8 mux_pwr_oe4   (major_mode, pwr_oe4,   hr_pwr_oe4,   hs_pwr_oe4,   1'b0,   he_pwr_oe4,   hfl_pwr_oe4,   1'b0,         1'b0, 1'b0);
 218 mux8 mux_pwr_lo    (major_mode, pwr_lo,    hr_pwr_lo,    hs_pwr_lo,    1'b0,   he_pwr_lo,    hfl_pwr_lo,    1'b0,         1'b0, 1'b0);
 219 mux8 mux_pwr_hi    (major_mode, pwr_hi,    hr_pwr_hi,    hs_pwr_hi,    1'b0,   he_pwr_hi,    hfl_pwr_hi,    1'b0,         1'b0, 1'b0);
 220 mux8 mux_adc_clk   (major_mode, adc_clk,   hr_adc_clk,   hs_adc_clk,   1'b0,   he_adc_clk,   hfl_adc_clk,   1'b0,         1'b0, 1'b0);
 221 mux8 mux_dbg       (major_mode, dbg,       hr_dbg,       hs_dbg,       1'b0,   he_dbg,       hfl_dbg,       1'b0,         1'b0, 1'b0);
 222
 223 // In all modes, let the ADC's outputs be enabled.
 224 assign adc_noe = 1'b0;
 225
 226 endmodule