xilinx FPGA的XADC功能测试_xilinx xadc

作者：繁依Fanyi0 | 2024-04-26 12:41:14

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xilinx xadc

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Xilinx 7系列FPGA内置了一个模数转换模块，称为XADC。XADC内部集成了两个最高1MHz采样率，1Vpp的ADC模块，可以采集FPGA外部输入的模拟信号并转为数字信号。

XADC不需要外接任何输入信号，就可以测量FPGA内部的温度、VCCINT、VCCBRAM、VCCAUX电压。另外，还可以测量多达17路的外部差分输入模拟信号的幅度，包括专用差分信号输入信号VP/N以及VAUXP/N[15:0]。

所有的待测量信号均通过XADC内部的两个12bit-1MSPS的ADC模块(ADC_A和ADC_B)测量，并将转换结果存入状态寄存器(Status Registers)，用户通过DRP接口可以在FPGA内部读取这些数据，也可以在vivado软件的调试界面中用JTAG获得这些数据。

另外ADC工作的配置参数由用户提供，用户将参数可以实时在线写入控制寄存器(Control Registers)，从而实时控制ADC的工作状态，用户也可以在初始化配置XADC后将参数固定，不用实时配置，用户只需等待XADC初始化完成后，不断读取状态寄存器中的值即可。如下图1所示为XADC的功能模块图：

图1：XADC的功能模块图

1，硬件工作环境

FPGA：kintex-7。供电：12V/4A 直流电源。该板卡最多外接32通道2Vpp模拟信号以及20路外部触发信号。数据传输接口方式有千兆以太网接口、高速光纤接口以及低速USB串口。

图2：硬件PCB

2，逻辑开发环境

Vivado2017.4。

3，测试工程的逻辑框图介绍

如下图3所示为逻辑实现框图，由于硬件电路在设计时并没有考虑外部输入模拟电压的应用需求，因此本次测试针对的是FPGA内部的工作温度、内核电压VCCINT、VCCBRAM以及辅助电压VCCAUX这4个工作参数。

图3：逻辑测试框图

4，实现方法介绍

实现上就是对Dynamic Reconfiguration Port (DRP) 的时序进行读写操作，XADC的源语参数确定后，只需要对DRP端口进行读操作，就ok了。时序上并不复杂，其ug480官方文档给出的时序图如下图4所示，我们按照该时序控制信号就行了。

图4：DRP读写时序

如果我们连时序图都懒得看，也有其它办法。其官方给出了片上温度测量、VCCINT、VCCBRAM、VCCAUX以及4路VAUXP/N[3:0]的代码例程，ug480的第83页开始给出了应用例程和仿真测试时序，直接copy到我们的工程就可以了，DRP控制时序上非常简单，小青菜哥哥在这里就不一一介绍DRP端口信号的时序了，可以直接仿真看更清晰。

5，板级测试

我们copy了官方提供的代码并修改配置参数为只测试片上温度测量、VCCINT、VCCBRAM、VCCAUX这4路信号，并利用图3的框图建立工程，在线测试了温度和电压的功能。如图5所示为ILA在线监测的片上温度测量、VCCINT、VCCBRAM、VCCAUX这4路信号的时序图：其中EOC为每次ADC完成1路信号转换指示信号，EOS为每4路信号完成转换的指示信号。每个EOC指示信号的时间间隔为100个DRP时钟周期，因此可以推断出ADC的采样率为1MSPS。每次EOS拉高后，就表示用户可以从状态寄存器中读取4路信号的值了。

图5：4路信号整体测试时序图

如图6所示为读取这4路信号的更细节时序图，可以看到连续写入4个Dadd地址后，随后会出现drdy信号4次拉高，每次拉高时我们取出数据即可，共取4次，从而完成片上温度测量、VCCINT、VCCBRAM、VCCAUX这4路信号的取数。

图6：4路信号测试细节时序图

从图7可以更明显的观察到，每次drdy拉高时，对应读取了1路信号。拉高4次，完成4路信号的一次读取过程，之后再监测EOS信号，只要它再次拉高，就又在状态寄存器中读取这4路信号的值，如此循环往复。

图7：drdy信号拉高时取数

将取出来的4路数据通过网络接口发送到计算机，通过编写上位机软件就可以实时显示FPGA的温度和和电压了，如图8所示：FPGA的工作温度在49°附近波动，VCCINT为~1V，VCCBRAM也为~1V，VCCAUX为~1.8V，和实际FPGA的供电电压一致。

图8：上位机温度、电压监视界面

小青菜哥哥的XADC测试完整源代码如下，请大家参考：


`timescale 1ns / 1ps
//
// Engineer: 小青菜哥哥
// Create Date: 2020/06/12 17:12:08
// Design Name: 
// Module Name: Module_XADC
// Project Name: xilinx XADC测试
module Module_XADC(
	input DCLK, // Clock input for DRP 100MHz
    input RESET,   
	output [31:0]	dataout,
	output			datavld
);
	
	wire busy;
    wire [5:0] channel;
    wire drdy;
	reg [6:0] daddr;
    reg [15:0] di_drp;
    wire [15:0] do_drp;
    wire [15:0] vauxp_active;
    wire [15:0] vauxn_active;
    reg [1:0]  den_reg;
    reg [1:0]  dwe_reg;
    reg [11:0] MEASURED_TEMP, MEASURED_VCCINT; 
	reg			TEMP_VALID,VCCINT_VALID,VCCAUX_VALID,VCCBRAM_VALID;
	reg [11:0] MEASURED_VCCAUX, MEASURED_VCCBRAM;
	
    reg [7:0]   state = init_read;
    parameter       init_read       = 8'h00,
                    read_waitdrdy   = 8'h01,
                    write_waitdrdy  = 8'h03,
                    read_reg00      = 8'h04,
                    reg00_waitdrdy  = 8'h05,
                    read_reg01      = 8'h06,
                    reg01_waitdrdy  = 8'h07,
                    read_reg02      = 8'h08,
                    reg02_waitdrdy  = 8'h09,
                    read_reg06      = 8'h0a,
                    reg06_waitdrdy  = 8'h0b,
                    read_reg10      = 8'h0c,
                    reg10_waitdrdy  = 8'h0d,
                    read_reg11      = 8'h0e,
                    reg11_waitdrdy  = 8'h0f,
                    read_reg12      = 8'h10,
                    reg12_waitdrdy  = 8'h11,
                    read_reg13      = 8'h12,
                    reg13_waitdrdy  = 8'h13;
    
   always @(posedge DCLK)
      if (RESET) begin
         state   <= init_read;
         den_reg <= 2'h0;
         dwe_reg <= 2'h0;
         di_drp  <= 16'h0000;
		 TEMP_VALID<=1'b0;
		 VCCINT_VALID<=1'b0;
		 VCCAUX_VALID<=1'b0;
		 VCCBRAM_VALID<=1'b0;
      end
      else
         case (state)
         init_read : begin
            daddr = 7'h40;
            den_reg = 2'h2; // performing read
            if (busy == 0 ) state <= read_waitdrdy;
            end
         read_waitdrdy : 
            if (drdy ==1)  begin
               di_drp = do_drp  & 16'h03_FF; //Clearing AVG bits for Configreg0
               daddr = 7'h40;
               den_reg = 2'h2;
               dwe_reg = 2'h2; // performing write
               state = write_waitdrdy;
            end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;
               state = state;                
            end
         write_waitdrdy : 
            if (drdy ==1) begin
				  state = read_reg00;
               end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
         read_reg00 : begin
			TEMP_VALID<=1'b0;
			VCCINT_VALID<=1'b0;
			VCCAUX_VALID<=1'b0;
			VCCBRAM_VALID<=1'b0;
            daddr   = 7'h00;
            den_reg = 2'h2; // performing read
            if (EOS == 1) state   <=reg00_waitdrdy;
            end
         reg00_waitdrdy : 
            if (drdy ==1)  begin
               MEASURED_TEMP = do_drp[15:4]; 
			   TEMP_VALID<=1'b1;
			   VCCINT_VALID<=1'b0;
			   VCCAUX_VALID<=1'b0;
			   VCCBRAM_VALID<=1'b0;
               state <=read_reg01;
               end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
         read_reg01 : begin
			TEMP_VALID<=1'b0;
			VCCINT_VALID<=1'b0;
			VCCAUX_VALID<=1'b0;
			VCCBRAM_VALID<=1'b0;
            daddr   = 7'h01;
            den_reg = 2'h2; // performing read
            state   <=reg01_waitdrdy;
            end
            reg01_waitdrdy : 
            if (drdy ==1)  begin
               MEASURED_VCCINT = do_drp[15:4]; 
			   TEMP_VALID<=1'b0;
			   VCCINT_VALID<=1'b1;
			   VCCAUX_VALID<=1'b0;
			   VCCBRAM_VALID<=1'b0;
               state <=read_reg02;
               end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
         read_reg02 : begin
		     TEMP_VALID<=1'b0;
			 VCCINT_VALID<=1'b0;
			 VCCAUX_VALID<=1'b0;
			 VCCBRAM_VALID<=1'b0;
            daddr   = 7'h02;
            den_reg = 2'h2; // performing read
            state   <=reg02_waitdrdy;
            end
         reg02_waitdrdy : 
            if (drdy ==1)  begin
               MEASURED_VCCAUX = do_drp[15:4];
			   TEMP_VALID<=1'b0;
			   VCCINT_VALID<=1'b0;
			   VCCAUX_VALID<=1'b1;
			   VCCBRAM_VALID<=1'b0;
               state <=read_reg06;
               end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
         read_reg06 : begin
		    TEMP_VALID<=1'b0;
			VCCINT_VALID<=1'b0;
			VCCAUX_VALID<=1'b0;
			VCCBRAM_VALID<=1'b0;
            daddr   = 7'h06;
            den_reg = 2'h2; // performing read
            state   <=reg06_waitdrdy;
            end
         reg06_waitdrdy : 
            if (drdy ==1)  begin
				MEASURED_VCCBRAM = do_drp[15:4]; //由于硬件设计没有使用外部输入模拟端口，因此只进行温度、vccint、vccaux、vccbram这前四个值的读取
				TEMP_VALID<=1'b0;
			    VCCINT_VALID<=1'b0;
			    VCCAUX_VALID<=1'b0;
			    VCCBRAM_VALID<=1'b1;
               state <= read_reg00/*read_reg10*/;
            end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
        /* read_reg10 : begin
               daddr   = 7'h10;
               den_reg = 2'h2; // performing read
               state   <= reg10_waitdrdy;
            end
         reg10_waitdrdy : 
            if (drdy ==1)  begin
               MEASURED_AUX0 = do_drp; 
               state <= read_reg11;
            end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
         read_reg11 : begin
            daddr   = 7'h11;
            den_reg = 2'h2; // performing read
            state   <= reg11_waitdrdy;
            end
         reg11_waitdrdy : 
            if (drdy ==1)  begin
               MEASURED_AUX1 = do_drp; 
               state <= read_reg12;
               end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
         read_reg12 : begin
            daddr   = 7'h12;
            den_reg = 2'h2; // performing read
            state   <= reg12_waitdrdy;
            end
         reg12_waitdrdy : 
            if (drdy ==1)  begin
               MEASURED_AUX2= do_drp; 
               state <= read_reg13;
               end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end
         read_reg13 : begin
            daddr   = 7'h13;
            den_reg = 2'h2; // performing read
            state   <= reg13_waitdrdy;
            end
         reg13_waitdrdy :
			if (drdy ==1)  begin
               MEASURED_AUX3= do_drp; 
               state <=read_reg00;
               daddr   = 7'h00;
            end
            else begin
               den_reg = { 1'b0, den_reg[1] } ;
               dwe_reg = { 1'b0, dwe_reg[1] } ;      
               state = state;          
            end*/
         endcase
		 
		XADC #(// Initializing the XADC Control Registers
			.INIT_40(16'h9000),// Calibration coefficient averaging disabled, averaging of 16 selected for external channels
			.INIT_41(16'h2ef0),// Continuous Seq Mode, Disable unused ALMs, Enable calibration
			.INIT_42(16'h0400),//  Set DCLK divider to 4, ADC = 1Msps, DCLK = 100MHz
			.INIT_48(16'h4701),// Sequencer channel - enable Temp sensor, VCCINT, VCCAUX, VCCBRAM, and calibration
			.INIT_49(16'h0000),//  Sequencer channel - disabled all aux analog channels 0
			.INIT_4A(16'h4700),// Averaging enabled for Temp sensor, VCCINT, VCCAUX,VCCBRAM
			.INIT_4B(16'h0000),//  No averaging on external channels
			.INIT_4C(16'h0000),// Sequencer Bipolar selection 
			.INIT_4D(16'h0000),// Sequencer Bipolar selection
			.INIT_4E(16'h0000),//  Sequencer Acq time selection
			.INIT_4F(16'h0000),//  Sequencer Acq time selection
			.INIT_50(16'hb5ed),// Temp upper alarm trigger 85°C
			.INIT_51(16'h5999),// Vccint upper alarm limit 1.05V
			.INIT_52(16'hA147),// Vccaux upper alarm limit 1.89V
			.INIT_53(16'h0000),// OT upper alarm limit 125°C using automatic shutdown - see Thermal 
			.INIT_54(16'ha93a),// Temp lower alarm reset 60°C
			.INIT_55(16'h5111),// Vccint lower alarm limit 0.95V
			.INIT_56(16'h91Eb),// Vccaux lower alarm limit 1.71V
			.INIT_57(16'hae4e),// OT lower alarm reset 70°C - see Thermal Management
			.INIT_58(16'h5999),// VCCBRAM upper alarm limit 1.05V
			.SIM_MONITOR_FILE("design.txt")// Analog Stimulus file for simulation
		)
		
		XADC_INST (// Connect up instance IO. See UG580 for port descriptions
			.CONVST (1'b0),// not used
			.CONVSTCLK  (1'b0), // not used
			.DADDR  (daddr),
			.DCLK   (DCLK),
			.DEN    (den_reg[0]),
			.DI     (di_drp),
			.DWE    (dwe_reg[0]),
			.RESET  (RESET),
			.VAUXN  (16'd0 ),// not used
			.VAUXP  (16'd0 ),// not used
			.ALM    (ALM),
			.BUSY   (busy),
			.CHANNEL(CHANNEL),
			.DO     (do_drp),
			.DRDY   (drdy),
			.EOC    (EOC),
			.EOS    (EOS),
			.JTAGBUSY   (),// not used
			.JTAGLOCKED (),// not used
			.JTAGMODIFIED (),// not used
			.OT     (OT),
			.MUXADDR    (),// not used
			.VP     (1'b0),// not used
			.VN     (1'b0)// not used
			);
				
	
	ila_xadc ila_xadc_inst (
	.clk	(DCLK), // input wire clk
	.probe0(MEASURED_TEMP), // input wire [11:0]  probe0  
	.probe1(MEASURED_VCCINT), // input wire [11:0]  probe1 
	.probe2(MEASURED_VCCAUX), // input wire [11:0]  probe2 
	.probe3(MEASURED_VCCBRAM), // input wire [11:0]  probe3 
	.probe4(TEMP_VALID), // input wire [0:0]  probe4 
	.probe5(VCCINT_VALID), // input wire [0:0]  probe5 
	.probe6(VCCAUX_VALID), // input wire [0:0]  probe6 
	.probe7(VCCBRAM_VALID), // input wire [0:0]  probe7 
	.probe8(daddr),//wire [6:0]
	.probe9(den_reg[0]),//wire [0:0]
	.probe10(dwe_reg[0]),//wire [0:0]
	.probe11(busy),//wire [0:0]
	.probe12(do_drp),//wire [15:0]
	.probe13(drdy),//wire [0:0]
	.probe14(EOC),//wire [0:0]
	.probe15(EOS)//wire [0:0]
	);
	
	wire	[31:0]	fifo_in_temp = {16'd0,4'd1,MEASURED_TEMP};
	wire	[31:0]	fifo_in_vint = {16'd0,4'd2,MEASURED_VCCINT};
	wire	[31:0]	fifo_in_vaux = {16'd0,4'd3,MEASURED_VCCAUX};
	wire	[31:0]	fifo_in_vram = {16'd0,4'd4,MEASURED_VCCBRAM};	
	
	reg	[31:0] fifo_data_in;
	reg		   fifo_data_en;
	wire		empty;
	fifo_xadc fifo_xadc_inst (
	  .clk(DCLK),      // input wire clk
	  .srst(RESET),    // input wire srst
	  .din(fifo_data_in),      // input wire [31 : 0] din
	  .wr_en(fifo_data_en),  // input wire wr_en
	  .rd_en(~empty),  // input wire rd_en
	  .dout(dataout),    // output wire [31 : 0] dout
	  .full(),    // output wire full
	  .empty(empty),  // output wire empty
	  .valid(datavld)  // output wire valid
	);
 
	always @(posedge DCLK)
		if (RESET) begin
			fifo_data_en<=1'b0;
			fifo_data_in<=32'b0;
		end
		else if(TEMP_VALID)
			begin
			fifo_data_en<=1'b1;
			fifo_data_in<=fifo_in_temp;
		end
		else if(VCCINT_VALID)
			begin
			fifo_data_en<=1'b1;
			fifo_data_in<=fifo_in_vint;
		end
		else if(VCCAUX_VALID)
			begin
			fifo_data_en<=1'b1;
			fifo_data_in<=fifo_in_vaux;
		end
		else if(VCCBRAM_VALID)
			begin
			fifo_data_en<=1'b1;
			fifo_data_in<=fifo_in_vram;
		end
		else 
			begin
			fifo_data_en<=1'b0;
			fifo_data_in<=32'b0;
		end
endmodule

今天的博文就到这里了，有问题请在小青菜哥哥的公众号留言，谢谢！

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