基于zynq的pwm ip核设计

一.用户自定义ip核

1,环境使用的是vivado 2014.4

2,点击Tools—>create and package ip..打开用户创建ip向导,点击next

3.在choose create peripheral or packege ip 对话框中选择 create new AXI 4peripheral 

4.在peripheral details对话框填写自己ip信息,name 填写为axi_pwm.

5.然后依次按默认下一步 ,finish

6 点击左侧的IP catalog选项 搜索到AXI PWM 右键AXI PWM 选择edit in IP packager 对ip进行编辑

7 在source窗口双击axi_pwm_v1_0.v顶层文件 编写

`timescale 1 ns / 1 ps

	module axi_pwm_v1_0 #//<span style="color:#ff0000;">参数的定义</span>
	(
		// Users to add parameters here

		// User parameters ends
		// Do not modify the parameters beyond this line


		// Parameters of Axi Slave Bus Interface S00_AXI
		parameter integer C_S00_AXI_DATA_WIDTH	= 32,
		parameter integer C_S00_AXI_ADDR_WIDTH	= 4
	)
	(
		// Users to add ports here
       <span style="color:#ff0000;"> output wire pwm_out,</span>
		// User ports ends
		// Do not modify the ports beyond this line


		// Ports of Axi Slave Bus Interface S00_AXI
		input wire  s00_axi_aclk,
		input wire  s00_axi_aresetn,
		input wire [C_S00_AXI_ADDR_WIDTH-1 : 0] s00_axi_awaddr,
		input wire [2 : 0] s00_axi_awprot,
		input wire  s00_axi_awvalid,
		output wire  s00_axi_awready,
		input wire [C_S00_AXI_DATA_WIDTH-1 : 0] s00_axi_wdata,
		input wire [(C_S00_AXI_DATA_WIDTH/8)-1 : 0] s00_axi_wstrb,
		input wire  s00_axi_wvalid,
		output wire  s00_axi_wready,
		output wire [1 : 0] s00_axi_bresp,
		output wire  s00_axi_bvalid,
		input wire  s00_axi_bready,
		input wire [C_S00_AXI_ADDR_WIDTH-1 : 0] s00_axi_araddr,
		input wire [2 : 0] s00_axi_arprot,
		input wire  s00_axi_arvalid,
		output wire  s00_axi_arready,
		output wire [C_S00_AXI_DATA_WIDTH-1 : 0] s00_axi_rdata,
		output wire [1 : 0] s00_axi_rresp,
		output wire  s00_axi_rvalid,
		input wire  s00_axi_rready
	);//<span style="color:#ff6666;">ip核端口</span>
// Instantiation of Axi Bus Interface S00_AXI
//<span style="color:#ff6666;">参数的传递</span>
	axi_pwm_v1_0_S00_AXI # ( 
		.C_S_AXI_DATA_WIDTH(C_S00_AXI_DATA_WIDTH),
		.C_S_AXI_ADDR_WIDTH(C_S00_AXI_ADDR_WIDTH)
	) axi_pwm_v1_0_S00_AXI_inst (
	   <span style="color:#ff6666;"> .pwm_out(pwm_out),//端口的例化</span>
		.S_AXI_ACLK(s00_axi_aclk),
		.S_AXI_ARESETN(s00_axi_aresetn),
		.S_AXI_AWADDR(s00_axi_awaddr),
		.S_AXI_AWPROT(s00_axi_awprot),
		.S_AXI_AWVALID(s00_axi_awvalid),
		.S_AXI_AWREADY(s00_axi_awready),
		.S_AXI_WDATA(s00_axi_wdata),
		.S_AXI_WSTRB(s00_axi_wstrb),
		.S_AXI_WVALID(s00_axi_wvalid),
		.S_AXI_WREADY(s00_axi_wready),
		.S_AXI_BRESP(s00_axi_bresp),
		.S_AXI_BVALID(s00_axi_bvalid),
		.S_AXI_BREADY(s00_axi_bready),
		.S_AXI_ARADDR(s00_axi_araddr),
		.S_AXI_ARPROT(s00_axi_arprot),
		.S_AXI_ARVALID(s00_axi_arvalid),
		.S_AXI_ARREADY(s00_axi_arready),
		.S_AXI_RDATA(s00_axi_rdata),
		.S_AXI_RRESP(s00_axi_rresp),
		.S_AXI_RVALID(s00_axi_rvalid),
		.S_AXI_RREADY(s00_axi_rready)
	);

	// Add user logic here

	// User logic ends

	endmodule
8.在axi_pwm_v1_0_S00_AXI.v 编写

`timescale 1 ns / 1 ps

	module axi_pwm_v1_0_S00_AXI #
	(
		// Users to add parameters here

		// User parameters ends
		// Do not modify the parameters beyond this line

		// Width of S_AXI data bus
		parameter integer C_S_AXI_DATA_WIDTH	= 32,
		// Width of S_AXI address bus
		parameter integer C_S_AXI_ADDR_WIDTH	= 4
	)
	(
		// Users to add ports here
        <span style="color:#ff0000;">output wire pwm_out,</span>
		// User ports ends
		// Do not modify the ports beyond this line

		// Global Clock Signal
		input wire  S_AXI_ACLK,
		// Global Reset Signal. This Signal is Active LOW
		input wire  S_AXI_ARESETN,
		// Write address (issued by master, acceped by Slave)
		input wire [C_S_AXI_ADDR_WIDTH-1 : 0] S_AXI_AWADDR,
		// Write channel Protection type. This signal indicates the
    		// privilege and security level of the transaction, and whether
    		// the transaction is a data access or an instruction access.
		input wire [2 : 0] S_AXI_AWPROT,
		// Write address valid. This signal indicates that the master signaling
    		// valid write address and control information.
		input wire  S_AXI_AWVALID,
		// Write address ready. This signal indicates that the slave is ready
    		// to accept an address and associated control signals.
		output wire  S_AXI_AWREADY,
		// Write data (issued by master, acceped by Slave) 
		input wire [C_S_AXI_DATA_WIDTH-1 : 0] S_AXI_WDATA,
		// Write strobes. This signal indicates which byte lanes hold
    		// valid data. There is one write strobe bit for each eight
    		// bits of the write data bus.    
		input wire [(C_S_AXI_DATA_WIDTH/8)-1 : 0] S_AXI_WSTRB,
		// Write valid. This signal indicates that valid write
    		// data and strobes are available.
		input wire  S_AXI_WVALID,
		// Write ready. This signal indicates that the slave
    		// can accept the write data.
		output wire  S_AXI_WREADY,
		// Write response. This signal indicates the status
    		// of the write transaction.
		output wire [1 : 0] S_AXI_BRESP,
		// Write response valid. This signal indicates that the channel
    		// is signaling a valid write response.
		output wire  S_AXI_BVALID,
		// Response ready. This signal indicates that the master
    		// can accept a write response.
		input wire  S_AXI_BREADY,
		// Read address (issued by master, acceped by Slave)
		input wire [C_S_AXI_ADDR_WIDTH-1 : 0] S_AXI_ARADDR,
		// Protection type. This signal indicates the privilege
    		// and security level of the transaction, and whether the
    		// transaction is a data access or an instruction access.
		input wire [2 : 0] S_AXI_ARPROT,
		// Read address valid. This signal indicates that the channel
    		// is signaling valid read address and control information.
		input wire  S_AXI_ARVALID,
		// Read address ready. This signal indicates that the slave is
    		// ready to accept an address and associated control signals.
		output wire  S_AXI_ARREADY,
		// Read data (issued by slave)
		output wire [C_S_AXI_DATA_WIDTH-1 : 0] S_AXI_RDATA,
		// Read response. This signal indicates the status of the
    		// read transfer.
		output wire [1 : 0] S_AXI_RRESP,
		// Read valid. This signal indicates that the channel is
    		// signaling the required read data.
		output wire  S_AXI_RVALID,
		// Read ready. This signal indicates that the master can
    		// accept the read data and response information.
		input wire  S_AXI_RREADY
	);

	// AXI4LITE signals
	reg [C_S_AXI_ADDR_WIDTH-1 : 0] 	axi_awaddr;
	reg  	axi_awready;
	reg  	axi_wready;
	reg [1 : 0] 	axi_bresp;
	reg  	axi_bvalid;
	reg [C_S_AXI_ADDR_WIDTH-1 : 0] 	axi_araddr;
	reg  	axi_arready;
	reg [C_S_AXI_DATA_WIDTH-1 : 0] 	axi_rdata;
	reg [1 : 0] 	axi_rresp;
	reg  	axi_rvalid;

	// Example-specific design signals
	// local parameter for addressing 32 bit / 64 bit C_S_AXI_DATA_WIDTH
	// ADDR_LSB is used for addressing 32/64 bit registers/memories
	// ADDR_LSB = 2 for 32 bits (n downto 2)
	// ADDR_LSB = 3 for 64 bits (n downto 3)
	localparam integer ADDR_LSB = (C_S_AXI_DATA_WIDTH/32) + 1;
	localparam integer OPT_MEM_ADDR_BITS = 1;
	//----------------------------------------------
	//-- Signals for user logic register space example
	<span style="color:#ff0000;">wire                        ovprd;
	reg[C_S_AXI_DATA_WIDTH-1:0]   pwm_counter;
	wire                        pre_pwm_out;</span>
	//------------------------------------------------
	//-- Number of Slave Registers 4
	reg [C_S_AXI_DATA_WIDTH-1:0]	slv_reg0;
	reg [C_S_AXI_DATA_WIDTH-1:0]	slv_reg1;
	reg [C_S_AXI_DATA_WIDTH-1:0]	slv_reg2;
	reg [C_S_AXI_DATA_WIDTH-1:0]	slv_reg3;
	wire	 slv_reg_rden;
	wire	 slv_reg_wren;
	reg [C_S_AXI_DATA_WIDTH-1:0]	 reg_data_out;
	integer	 byte_index;

	// I/O Connections assignments

	assign S_AXI_AWREADY	= axi_awready;
	assign S_AXI_WREADY	= axi_wready;
	assign S_AXI_BRESP	= axi_bresp;
	assign S_AXI_BVALID	= axi_bvalid;
	assign S_AXI_ARREADY	= axi_arready;
	assign S_AXI_RDATA	= axi_rdata;
	assign S_AXI_RRESP	= axi_rresp;
	assign S_AXI_RVALID	= axi_rvalid;
	// Implement axi_awready generation
	// axi_awready is asserted for one S_AXI_ACLK clock cycle when both
	// S_AXI_AWVALID and S_AXI_WVALID are asserted. axi_awready is
	// de-asserted when reset is low.

	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      axi_awready <= 1'b0;
	    end 
	  else
	    begin    
	      if (~axi_awready && S_AXI_AWVALID && S_AXI_WVALID)
	        begin
	          // slave is ready to accept write address when 
	          // there is a valid write address and write data
	          // on the write address and data bus. This design 
	          // expects no outstanding transactions. 
	          axi_awready <= 1'b1;
	        end
	      else           
	        begin
	          axi_awready <= 1'b0;
	        end
	    end 
	end       

	// Implement axi_awaddr latching
	// This process is used to latch the address when both 
	// S_AXI_AWVALID and S_AXI_WVALID are valid. 

	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      axi_awaddr <= 0;
	    end 
	  else
	    begin    
	      if (~axi_awready && S_AXI_AWVALID && S_AXI_WVALID)
	        begin
	          // Write Address latching 
	          axi_awaddr <= S_AXI_AWADDR;
	        end
	    end 
	end       

	// Implement axi_wready generation
	// axi_wready is asserted for one S_AXI_ACLK clock cycle when both
	// S_AXI_AWVALID and S_AXI_WVALID are asserted. axi_wready is 
	// de-asserted when reset is low. 

	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      axi_wready <= 1'b0;
	    end 
	  else
	    begin    
	      if (~axi_wready && S_AXI_WVALID && S_AXI_AWVALID)
	        begin
	          // slave is ready to accept write data when 
	          // there is a valid write address and write data
	          // on the write address and data bus. This design 
	          // expects no outstanding transactions. 
	          axi_wready <= 1'b1;
	        end
	      else
	        begin
	          axi_wready <= 1'b0;
	        end
	    end 
	end       

	// Implement memory mapped register select and write logic generation
	// The write data is accepted and written to memory mapped registers when
	// axi_awready, S_AXI_WVALID, axi_wready and S_AXI_WVALID are asserted. Write strobes are used to
	// select byte enables of slave registers while writing.
	// These registers are cleared when reset (active low) is applied.
	// Slave register write enable is asserted when valid address and data are available
	// and the slave is ready to accept the write address and write data.
	assign slv_reg_wren = axi_wready && S_AXI_WVALID && axi_awready && S_AXI_AWVALID;

	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      slv_reg0 <= 0;
	      slv_reg1 <= 0;
	      slv_reg2 <= 0;
	      slv_reg3 <= 0;
	    end 
	  else begin
	    if (slv_reg_wren)
	      begin
	        case ( axi_awaddr[ADDR_LSB+OPT_MEM_ADDR_BITS:ADDR_LSB] )
	          2'h0:
	            for ( byte_index = 0; byte_index <= (C_S_AXI_DATA_WIDTH/8)-1; byte_index = byte_index+1 )
	              if ( S_AXI_WSTRB[byte_index] == 1 ) begin
	                // Respective byte enables are asserted as per write strobes 
	                // Slave register 0
	                slv_reg0[(byte_index*8) +: 8] <= S_AXI_WDATA[(byte_index*8) +: 8];
	              end  
	          2'h1:
	            for ( byte_index = 0; byte_index <= (C_S_AXI_DATA_WIDTH/8)-1; byte_index = byte_index+1 )
	              if ( S_AXI_WSTRB[byte_index] == 1 ) begin
	                // Respective byte enables are asserted as per write strobes 
	                // Slave register 1
	                slv_reg1[(byte_index*8) +: 8] <= S_AXI_WDATA[(byte_index*8) +: 8];
	              end  
	          2'h2:
	            for ( byte_index = 0; byte_index <= (C_S_AXI_DATA_WIDTH/8)-1; byte_index = byte_index+1 )
	              if ( S_AXI_WSTRB[byte_index] == 1 ) begin
	                // Respective byte enables are asserted as per write strobes 
	                // Slave register 2
	                slv_reg2[(byte_index*8) +: 8] <= S_AXI_WDATA[(byte_index*8) +: 8];
	              end  
	          2'h3:
	            for ( byte_index = 0; byte_index <= (C_S_AXI_DATA_WIDTH/8)-1; byte_index = byte_index+1 )
	              if ( S_AXI_WSTRB[byte_index] == 1 ) begin
	                // Respective byte enables are asserted as per write strobes 
	                // Slave register 3
	                slv_reg3[(byte_index*8) +: 8] <= S_AXI_WDATA[(byte_index*8) +: 8];
	              end  
	          default : begin
	                      slv_reg0 <= slv_reg0;
	                      slv_reg1 <= slv_reg1;
	                      slv_reg2 <= slv_reg2;
	                      slv_reg3 <= slv_reg3;
	                    end
	        endcase
	      end
	  end
	end    

	// Implement write response logic generation
	// The write response and response valid signals are asserted by the slave 
	// when axi_wready, S_AXI_WVALID, axi_wready and S_AXI_WVALID are asserted.  
	// This marks the acceptance of address and indicates the status of 
	// write transaction.

	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      axi_bvalid  <= 0;
	      axi_bresp   <= 2'b0;
	    end 
	  else
	    begin    
	      if (axi_awready && S_AXI_AWVALID && ~axi_bvalid && axi_wready && S_AXI_WVALID)
	        begin
	          // indicates a valid write response is available
	          axi_bvalid <= 1'b1;
	          axi_bresp  <= 2'b0; // 'OKAY' response 
	        end                   // work error responses in future
	      else
	        begin
	          if (S_AXI_BREADY && axi_bvalid) 
	            //check if bready is asserted while bvalid is high) 
	            //(there is a possibility that bready is always asserted high)   
	            begin
	              axi_bvalid <= 1'b0; 
	            end  
	        end
	    end
	end   

	// Implement axi_arready generation
	// axi_arready is asserted for one S_AXI_ACLK clock cycle when
	// S_AXI_ARVALID is asserted. axi_awready is 
	// de-asserted when reset (active low) is asserted. 
	// The read address is also latched when S_AXI_ARVALID is 
	// asserted. axi_araddr is reset to zero on reset assertion.

	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      axi_arready <= 1'b0;
	      axi_araddr  <= 32'b0;
	    end 
	  else
	    begin    
	      if (~axi_arready && S_AXI_ARVALID)
	        begin
	          // indicates that the slave has acceped the valid read address
	          axi_arready <= 1'b1;
	          // Read address latching
	          axi_araddr  <= S_AXI_ARADDR;
	        end
	      else
	        begin
	          axi_arready <= 1'b0;
	        end
	    end 
	end       

	// Implement axi_arvalid generation
	// axi_rvalid is asserted for one S_AXI_ACLK clock cycle when both 
	// S_AXI_ARVALID and axi_arready are asserted. The slave registers 
	// data are available on the axi_rdata bus at this instance. The 
	// assertion of axi_rvalid marks the validity of read data on the 
	// bus and axi_rresp indicates the status of read transaction.axi_rvalid 
	// is deasserted on reset (active low). axi_rresp and axi_rdata are 
	// cleared to zero on reset (active low).  
	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      axi_rvalid <= 0;
	      axi_rresp  <= 0;
	    end 
	  else
	    begin    
	      if (axi_arready && S_AXI_ARVALID && ~axi_rvalid)
	        begin
	          // Valid read data is available at the read data bus
	          axi_rvalid <= 1'b1;
	          axi_rresp  <= 2'b0; // 'OKAY' response
	        end   
	      else if (axi_rvalid && S_AXI_RREADY)
	        begin
	          // Read data is accepted by the master
	          axi_rvalid <= 1'b0;
	        end                
	    end
	end    

	// Implement memory mapped register select and read logic generation
	// Slave register read enable is asserted when valid address is available
	// and the slave is ready to accept the read address.
	assign slv_reg_rden = axi_arready & S_AXI_ARVALID & ~axi_rvalid;
	always @(*)
	begin
	      // Address decoding for reading registers
	      case ( axi_araddr[ADDR_LSB+OPT_MEM_ADDR_BITS:ADDR_LSB] )
	        2'h0   : reg_data_out <= slv_reg0;
	        2'h1   : reg_data_out <= slv_reg1;
	        2'h2   : reg_data_out <= slv_reg2;
	        2'h3   : reg_data_out <= slv_reg3;
	        default : reg_data_out <= 0;
	      endcase
	end

	// Output register or memory read data
	always @( posedge S_AXI_ACLK )
	begin
	  if ( S_AXI_ARESETN == 1'b0 )
	    begin
	      axi_rdata  <= 0;
	    end 
	  else
	    begin    
	      // When there is a valid read address (S_AXI_ARVALID) with 
	      // acceptance of read address by the slave (axi_arready), 
	      // output the read dada 
	      if (slv_reg_rden)
	        begin
	          axi_rdata <= reg_data_out;     // register read data
	        end   
	    end
	end    

	// Add user logic here
    <span style="color:#ff0000;">always @(posedge S_AXI_ACLK)
    begin
      if(S_AXI_ARESETN == 1'b0 || ovprd || ~slv_reg1[31])
         pwm_counter = pwm_counter+1;
      else if (slv_reg1[31])
         pwm_counter = pwm_counter +1;
      else
         pwm_counter =pwm_counter;
    end
    assign ovprd=(pwm_counter[31:0] == slv_reg0[31:0])? 1'b0 : 1'b1;
    assign pre_pwm_out = (slv_reg1<pwm_counter)? 1'b0:1'b1;
    assign pwm_out = pre_pwm_out &slv_reg1[31];
       </span>
	// User logic ends

	endmodule
//注:红色是需要添加的

9,选择Package IP-axi_pwm 窗口单击Re-Package按钮完成ip核的封装

总结,此ip核的接口是基于axi总线的,内部有两个寄存器 一个是周期寄存器,另一个占空比寄存器

10.源码工程点击打开链接

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