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This commit is contained in:
Philippe Teuwen 2021-09-05 00:49:57 +02:00
commit 7404695e46
9 changed files with 290 additions and 290 deletions
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176
fpga-xc3s100e/hi_get_trace.v
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@ -12,25 +12,25 @@ module hi_get_trace(
);
input ck_1356megb;
input [7:0] adc_d;
input trace_enable;
input [2:0] major_mode;
input trace_enable;
input [2:0] major_mode;
output ssp_frame, ssp_din, ssp_clk;
// clock divider
reg [6:0] clock_cnt;
always @(negedge ck_1356megb)
begin
clock_cnt <= clock_cnt + 1;
clock_cnt <= clock_cnt + 1;
end
// sample at 13,56MHz / 8. The highest signal frequency (subcarrier) is 848,5kHz, i.e. in this case we oversample by a factor of 2
reg [2:0] sample_clock;
always @(negedge ck_1356megb)
begin
if (sample_clock == 3'd7)
sample_clock <= 3'd0;
else
sample_clock <= sample_clock + 1;
if (sample_clock == 3'd7)
sample_clock <= 3'd0;
else
sample_clock <= sample_clock + 1;
end
@ -41,65 +41,65 @@ reg write_enable1;
reg write_enable2;
always @(negedge ck_1356megb)
begin
previous_major_mode <= major_mode;
if (major_mode == `FPGA_MAJOR_MODE_HF_GET_TRACE)
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b0;
if (previous_major_mode != `FPGA_MAJOR_MODE_HF_GET_TRACE) // just switched into GET_TRACE mode
addr <= start_addr;
if (clock_cnt == 7'd0)
begin
if (addr == 12'd3071)
addr <= 12'd0;
else
addr <= addr + 1;
end
end
else if (major_mode != `FPGA_MAJOR_MODE_OFF)
begin
if (trace_enable)
begin
if (addr[11] == 1'b0)
begin
write_enable1 <= 1'b1;
write_enable2 <= 1'b0;
end
else
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b1;
end
if (sample_clock == 3'b000)
begin
if (addr == 12'd3071)
begin
addr <= 12'd0;
write_enable1 <= 1'b1;
write_enable2 <= 1'b0;
end
else
begin
addr <= addr + 1;
end
end
end
else
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b0;
start_addr <= addr;
end
end
else // major_mode == `FPGA_MAJOR_MODE_OFF
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b0;
if (previous_major_mode != `FPGA_MAJOR_MODE_OFF && previous_major_mode != `FPGA_MAJOR_MODE_HF_GET_TRACE) // just switched off
previous_major_mode <= major_mode;
if (major_mode == `FPGA_MAJOR_MODE_HF_GET_TRACE)
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b0;
if (previous_major_mode != `FPGA_MAJOR_MODE_HF_GET_TRACE) // just switched into GET_TRACE mode
addr <= start_addr;
if (clock_cnt == 7'd0)
begin
if (addr == 12'd3071)
addr <= 12'd0;
else
addr <= addr + 1;
end
end
else if (major_mode != `FPGA_MAJOR_MODE_OFF)
begin
if (trace_enable)
begin
if (addr[11] == 1'b0)
begin
write_enable1 <= 1'b1;
write_enable2 <= 1'b0;
end
else
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b1;
end
if (sample_clock == 3'b000)
begin
if (addr == 12'd3071)
begin
start_addr <= addr;
addr <= 12'd0;
write_enable1 <= 1'b1;
write_enable2 <= 1'b0;
end
end
else
begin
addr <= addr + 1;
end
end
end
else
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b0;
start_addr <= addr;
end
end
else // major_mode == `FPGA_MAJOR_MODE_OFF
begin
write_enable1 <= 1'b0;
write_enable2 <= 1'b0;
if (previous_major_mode != `FPGA_MAJOR_MODE_OFF && previous_major_mode != `FPGA_MAJOR_MODE_HF_GET_TRACE) // just switched off
begin
start_addr <= addr;
end
end
end
@ -110,20 +110,20 @@ reg [7:0] ram2 [1023:0]; // 1024 u8
always @(negedge ck_1356megb)
begin
if (write_enable1)
begin
ram1[addr[10:0]] <= adc_d;
D_out1 <= adc_d;
end
else
D_out1 <= ram1[addr[10:0]];
if (write_enable2)
if (write_enable1)
begin
ram1[addr[10:0]] <= adc_d;
D_out1 <= adc_d;
end
else
D_out1 <= ram1[addr[10:0]];
if (write_enable2)
begin
ram2[addr[9:0]] <= adc_d;
D_out2 <= adc_d;
end
else
D_out2 <= ram2[addr[9:0]];
ram2[addr[9:0]] <= adc_d;
D_out2 <= adc_d;
end
else
D_out2 <= ram2[addr[9:0]];
end
@ -135,27 +135,27 @@ reg [7:0] shift_out;
always @(negedge ck_1356megb)
begin
if (clock_cnt[3:0] == 4'd0) // update shift register every 16 clock cycles
begin
if (clock_cnt[6:4] == 3'd0) // either load new value
begin
begin
if (clock_cnt[6:4] == 3'd0) // either load new value
begin
if (addr[11] == 1'b0)
shift_out <= D_out1;
else
shift_out <= D_out2;
end
else
end
else
begin
// or shift left
shift_out[7:1] <= shift_out[6:0];
end
end
end
ssp_clk <= ~clock_cnt[3]; // ssp_clk frequency = 13,56MHz / 16 = 847,5 kHz
ssp_clk <= ~clock_cnt[3]; // ssp_clk frequency = 13,56MHz / 16 = 847,5 kHz
if (clock_cnt[6:4] == 3'b000) // set ssp_frame for 0...31
ssp_frame <= 1'b1;
else
ssp_frame <= 1'b0;
if (clock_cnt[6:4] == 3'b000) // set ssp_frame for 0...31
ssp_frame <= 1'b1;
else
ssp_frame <= 1'b0;
end