[[FpgaI2c]] - Nexys 4 付属のI2C温度計の SDA, SCL 信号線を直接スイッチで ON/OFFしながら、温度計を操作してみます。チャタリング防止や LED 表示などのため、ちょっと verilog で回路を作ります。 - verilog -- top.v module top(sSegAnode, sSegCathode, sw, led, cled1, cled2, bu, bd, bl, br, bc, scl, sda, bclck ); output [7:0] sSegAnode; output [7:0] sSegCathode; output [15:0] led; // led[8] ... if sda is sending, corresponding to the last sended sda, else corresponding to the last received sda // it is shifted to left when a positive edge of scl is detected. // led[0] corresponding to sw[0] // led[1] corresponding to sw[1] // led[2] corresponsing to center button, bc. output [2:0] cled1, cled2; input [15:0] sw; // sw[15:8] ... for setting sda send data, sw[7:0] ... for controlling // sw[0] ... if 1 sda is high=Z=high impedance, else low; input bu, bd, bl, br, bc, bclck; // bd corresponding to !reset. // bc corresponding to scl. scl=sw[0]|bc // if posedge bl is detected, sw is shown in hex in the 7seg led array. inout scl, sda; wire BNx, BWx, BEx, BCx; wire [7:0] swx; wire reset; wire sclRw, sdaRw; // write=1, read=0; reg [7:0] data; assign led[15:8]=data; assign led[7:0]=swx; assign reset=~bd; assign scl=BCx?1'bz:1'b0; assign cled1[2]=scl; assign sda=(swx[0])?1'bz:1'b0; assign cled2[2]=sda; always @(posedge scl, negedge reset) begin if(!reset) data<=0; else data<={data[6:0],sda}; end chattering #(12) chattering0(.clk(bclck), .reset(reset), .in({bu,bl,br,bc,sw[7:0]}), .out({BNx, BWx, BEx, BCx,swx})); // assign BNx=BN; // assign BWx=BW; // assign BEx=BE; // assign BCx=BC; sSegArray sSegArray0(.clk(bclck), .reset(reset), .load(1), .d({data,swx}), .anode(sSegAnode), .cathode(sSegCathode)); endmodule -- chattering.v module chattering(clk, reset, in, out ); parameter N=1; input clk, reset; input [N-1:0]in; output [N-1:0]out; reg [N-1:0]out; reg [21:0] count; always @(posedge clk or negedge reset) if(!reset) count <=0; else count <= count +1; always @(posedge clk) if(count==0) out <= in; endmodule -- sSegArray.v module sSegArray( clk,reset,load,d, anode, cathode ); parameter N=32; input clk,reset,load; input [N-1:0] d; output [7:0] anode; output [7:0] cathode; reg [7:0] anode; reg [7:0] cathode; reg [31:0] q; wire [2:0] selectedSeg; wire [7:0] wOneSeg; reg segClk; counter #(8) waitOneSeg(.clk(clk), .reset(reset), .load(0), .inc(1), .d(16'h0000), .q(wOneSeg)); //assign segClk= (wOneSeg==0)? ~segClk: segClk; always @(posedge clk, negedge reset) begin if(!reset) segClk<=0; else if (wOneSeg==0) segClk<=~segClk; end counter #(3) selector(.clk(segClk),.reset(reset),.load(0), .inc(1), .d(4'h0), .q(selectedSeg)); //counter #(3) selector(.clk(clk), .reset(reset), .load(0), .inc(1), .d(4'h0), .q(selectedSeg)); always @(posedge clk, negedge reset) begin if(!reset) anode=8'hFE; // note! anode is connected by pnp transistor. else // in order to active one 7seg, low should be setted to the 7seg. case (selectedSeg) 3'b000: anode=8'hFE; 3'b001: anode=8'hFD; 3'b010: anode=8'hFB; 3'b011: anode=8'hF7; 3'b100: anode=8'hEF; 3'b101: anode=8'hDF; 3'b110: anode=8'hBF; 3'b111: anode=8'h7F; endcase end reg [3:0] selectedVal; always @(posedge clk, negedge reset) begin if(!reset) cathode=8'h03; // note! when one segment of the cathode is low, else // and its anode is low, the segment glow. case (selectedVal) // ca 4'b0000: cathode=8'h03; //8'hfc; 0 ------ 4'b0001: cathode=8'h9f; //8'h60; 1 / / 4'b0010: cathode=8'h25; //8'hda; 2 /cf / cb 4'b0011: cathode=8'h0d; //8'hf2; 3 / / 4'b0100: cathode=8'h99; //8'h66; 4 ----- 4'b0101: cathode=8'h49; //8'hb6; 5 / cg / 4'b0110: cathode=8'h41; //8'hbe; 6 /ce / cc 4'b0111: cathode=8'h1f; //8'he0; 7 / / 4'b1000: cathode=8'h01; //8'hfe; 8 ------ . ch 4'b1001: cathode=8'h09; //8'hf6; 9 cd 4'b1010: cathode=8'h11; //8'hee; A 4'b1011: cathode=8'hc1; //8'h3e; B 4'b1100: cathode=8'h63; //8'h9c; C 4'b1101: cathode=8'h85; //8'h7c; D 4'b1110: cathode=8'h61; //8'h9e; E 4'b1111: cathode=8'h71; //8'h8e; F endcase end always @(posedge clk, negedge reset) begin if(!reset) selectedVal=q[3:0]; else case (selectedSeg) 3'b000: selectedVal=q[3:0]; 3'b001: selectedVal=q[7:4]; 3'b010: selectedVal=q[11:8]; 3'b011: selectedVal=q[15:12]; 3'b100: selectedVal=q[19:16]; 3'b101: selectedVal=q[23:20]; 3'b110: selectedVal=q[27:24]; 3'b111: selectedVal=q[31:28]; endcase end always @(posedge clk, negedge reset) begin if(!reset) q=0; else if(load) q=d; end endmodule -- counter.v module counter(clk, reset, load, inc, d, q ); parameter N=16; input clk, reset, load, inc; input [N-1:0] d; output [N-1:0] q; reg [N-1:0] q; always @(posedge clk or negedge reset) if(!reset) q <=0; else if(load) q<=d; else if(inc) q<=q+1; endmodule -- top.ucf ## Clock signal NET "bclck" LOC = "E3" | IOSTANDARD = "LVCMOS33"; #Bank = 35, Pin name = IO_L12P_T1_MRCC_35, Sch name = CLK100MHZ #NET "clk" TNM_NET = sys_clk_pin; #TIMESPEC TS_sys_clk_pin = PERIOD sys_clk_pin 100 MHz HIGH 50%; ## Switches NET "sw<0>" LOC = "U9" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L21P_T3_DQS_34, Sch name = SW0 NET "sw<1>" LOC = "U8" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_25_34, Sch name = SW1 NET "sw<2>" LOC = "R7" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L23P_T3_34, Sch name = SW2 NET "sw<3>" LOC = "R6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L19P_T3_34, Sch name = SW3 NET "sw<4>" LOC = "R5" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L19N_T3_VREF_34, Sch name = SW4 NET "sw<5>" LOC = "V7" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L20P_T3_34, Sch name = SW5 NET "sw<6>" LOC = "V6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L20N_T3_34, Sch name = SW6 NET "sw<7>" LOC = "V5" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L10P_T1_34, Sch name = SW7 NET "sw<8>" LOC = "U4" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L8P_T1-34, Sch name = SW8 NET "sw<9>" LOC = "V2" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L9N_T1_DQS_34, Sch name = SW9 NET "sw<10>" LOC = "U2" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L9P_T1_DQS_34, Sch name = SW10 NET "sw<11>" LOC = "T3" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L11N_T1_MRCC_34, Sch name = SW11 NET "sw<12>" LOC = "T1" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L17N_T2_34, Sch name = SW12 NET "sw<13>" LOC = "R3" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L11P_T1_SRCC_34, Sch name = SW13 NET "sw<14>" LOC = "P3" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L14N_T2_SRCC_34, Sch name = SW14 NET "sw<15>" LOC = "P4" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L14P_T2_SRCC_34, Sch name = SW15 ## LEDs NET "led<0>" LOC = "T8" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L24N_T3_34, Sch name = LED0 NET "led<1>" LOC = "V9" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L21N_T3_DQS_34, Sch name = LED1 NET "led<2>" LOC = "R8" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L24P_T3_34, Sch name = LED2 NET "led<3>" LOC = "T6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L23N_T3_34, Sch name = LED3 NET "led<4>" LOC = "T5" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L12P_T1_MRCC_34, Sch name = LED4 NET "led<5>" LOC = "T4" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L12N_T1_MRCC_34, Sch name = LED5 NET "led<6>" LOC = "U7" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L22P_T3_34, Sch name = LED6 NET "led<7>" LOC = "U6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L22N_T3_34, Sch name = LED7 NET "led<8>" LOC = "V4" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L10N_T1_34, Sch name = LED8 NET "led<9>" LOC = "U3" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L8N_T1_34, Sch name = LED9 NET "led<10>" LOC = "V1" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L7N_T1_34, Sch name = LED10 NET "led<11>" LOC = "R1" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L17P_T2_34, Sch name = LED11 NET "led<12>" LOC = "P5" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L13N_T2_MRCC_34, Sch name = LED12 NET "led<13>" LOC = "U1" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L7P_T1_34, Sch name = LED13 NET "led<14>" LOC = "R2" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L15N_T2_DQS_34, Sch name = LED14 NET "led<15>" LOC = "P2" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L15P_T2_DQS_34, Sch name = LED15 NET "cled1<2>" LOC = "K5" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L5P_T0_34, Sch name = LED16_R #NET "cled1<1>" LOC = "F13" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L5P_T0_AD9P_15, Sch name = LED16_G #NET "cled1<0>" LOC = "F6" | IOSTANDARD = "LVCMOS33"; #Bank = 35, Pin name = IO_L19N_T3_VREF_35, Sch name = LED16_B NET "cled2<2>" LOC = "K6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_0_34, Sch name = LED17_R #NET "cled2<1>" LOC = "H6" | IOSTANDARD = "LVCMOS33"; #Bank = 35, Pin name = IO_24P_T3_35, Sch name = LED17_G #NET "cled2<0>" LOC = "L16" | IOSTANDARD = "LVCMOS33"; #Bank = CONFIG, Pin name = IO_L3N_T0_DQS_EMCCLK_14, Sch name = LED17_B ## 7 segment display NET "sSegCathode<7>" LOC = "L3" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L2N_T0_34, Sch name = CA NET "sSegCathode<6>" LOC = "N1" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L3N_T0_DQS_34, Sch name = CB NET "sSegCathode<5>" LOC = "L5" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L6N_T0_VREF_34, Sch name = CC NET "sSegCathode<4>" LOC = "L4" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L5N_T0_34, Sch name = CD NET "sSegCathode<3>" LOC = "K3" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L2P_T0_34, Sch name = CE NET "sSegCathode<2>" LOC = "M2" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L4N_T0_34, Sch name = CF NET "sSegCathode<1>" LOC = "L6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L6P_T0_34, Sch name = CG NET "sSegCathode<0>" LOC = "M4" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L16P_T2_34, Sch name = DP NET "sSegAnode<0>" LOC = "N6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L18N_T2_34, Sch name = AN0 NET "sSegAnode<1>" LOC = "M6" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L18P_T2_34, Sch name = AN1 NET "sSegAnode<2>" LOC = "M3" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L4P_T0_34, Sch name = AN2 NET "sSegAnode<3>" LOC = "N5" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L13_T2_MRCC_34, Sch name = AN3 NET "sSegAnode<4>" LOC = "N2" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L3P_T0_DQS_34, Sch name = AN4 NET "sSegAnode<5>" LOC = "N4" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L16N_T2_34, Sch name = AN5 NET "sSegAnode<6>" LOC = "L1" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L1P_T0_34, Sch name = AN6 NET "sSegAnode<7>" LOC = "M1" | IOSTANDARD = "LVCMOS33"; #Bank = 34, Pin name = IO_L1N_T034, Sch name = AN7 ## Buttons #NET "btnCpuReset" LOC = "C12" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L3P_T0_DQS_AD1P_15, Sch name = CPU_RESET NET "bc" LOC = "E16" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L11N_T1_SRCC_15, Sch name = BTNC NET "bu" LOC = "F15" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L14P_T2_SRCC_15, Sch name = BTNU NET "bl" LOC = "T16" | IOSTANDARD = "LVCMOS33"; #Bank = CONFIG, Pin name = IO_L15N_T2_DQS_DOUT_CSO_B_14, Sch name = BTNL NET "br" LOC = "R10" | IOSTANDARD = "LVCMOS33"; #Bank = 14, Pin name = IO_25_14, Sch name = BTNR NET "bd" LOC = "V10" | IOSTANDARD = "LVCMOS33"; #Bank = 14, Pin name = IO_L21P_T3_DQS_14, Sch name = BTND ## Temperature Sensor #NET "tmpSCL" LOC = "F16" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L14N_T2_SRCC_15, Sch name = TMP_SCL #NET "tmpSDA" LOC = "G16" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L13N_T2_MRCC_15, Sch name = TMP_SDA #NET "tmpInt" LOC = "D14" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L1P_T0_AD0P_15, Sch name = TMP_INT #NET "tmpCT" LOC = "C14" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L1N_T0_AD0N_15, Sch name = TMP_CT NET "scl" LOC = "F16" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L14N_T2_SRCC_15, Sch name = TMP_SCL NET "sda" LOC = "G16" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L13N_T2_MRCC_15, Sch name = TMP_SDA #NET "tmpInt" LOC = "D14" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L1P_T0_AD0P_15, Sch name = TMP_INT #NET "tmpCT" LOC = "C14" | IOSTANDARD = "LVCMOS33"; #Bank = 15, Pin name = IO_L1N_T0_AD0N_15, Sch name = TMP_CT ---- #counter