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Commit ebe882e3 authored by Mike Lyons's avatar Mike Lyons
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SPILoopback for testing without XPS system

parent 8971e8ed
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projnav/ucf/atlys/spiloop.ucf 0 → 100644
View file @ ebe882e3
Net Reset LOC=N4 | IOSTANDARD=LVCMOS18;
Net SysClk LOC=L15 | IOSTANDARD=LVCMOS33;
# SPI Port
Net spi_miso LOC=U16 | IOSTANDARD=LVCMOS33;
Net spi_mosi LOC=U15 | IOSTANDARD=LVCMOS33;
Net spi_clk LOC=R10 | IOSTANDARD=LVCMOS33;
Net spi_ss LOC=M11 | IOSTANDARD=LVCMOS33;
# LEDs
Net leds<0> LOC=U18 | IOSTANDARD=LVCMOS33;
Net leds<1> LOC=M14 | IOSTANDARD=LVCMOS33;
Net leds<2> LOC=N14 | IOSTANDARD=LVCMOS33;
Net leds<3> LOC=L14 | IOSTANDARD=LVCMOS33;
Net leds<4> LOC=M13 | IOSTANDARD=LVCMOS33;
Net leds<5> LOC=D4 | IOSTANDARD=LVCMOS33;
Net leds<6> LOC=P16 | IOSTANDARD=LVCMOS33;
Net leds<7> LOC=N12 | IOSTANDARD=LVCMOS33;
src/spi_base/spiifc.v
View file @ ebe882e3
......@@ -232,251 +232,4 @@ module spiifc(
end // Reset/Reset'
end
/*
reg rcByte_valid;
wire rcClockBridgeEmpty;
wire readRcByte;
assign getRcByte = ~rcClockBridgeEmpty;
wire rcClockBridgeReadValid;
wire rcClockBridgeFull;
wire [7:0] rcByte;
clock_bridge recvClockBridge (
.rst(Reset), // input rst
.wr_clk(~SPI_CLK), // input wr_clk
.rd_clk(SysClk), // input rd_clk
.din(SPI_MOSI), // input [0 : 0] din
.wr_en(~SPI_SS), // input wr_en
.rd_en(getRcByte), // input rd_en
.dout(rcByte), // output [7 : 0] dout
.full(rcClockBridgeFull), // output full
.empty(rcClockBridgeEmpty), // output empty
.valid(rcClockBridgeReadValid) // output valid
);
always @(posedge SysClk) begin
rcByte_valid <= getRcByte;
end
wire txCmdClkBridgeEmpty;
wire txCmdClkBridgeFull;
wire [7:0] txCmd;
wire txCmdValid;
assign txCmdValid = ~txCmdClkBridgeEmpty;
wire postTxCmd;
assign postTxCmd =
fifo_8bit_to_8bit txCmdClkBridge(
.rst(Reset), // input rst
.wr_clk(SysClk), // input wr_clk
.rd_clk(SPI_CLK), // input rd_clk
.din(din), // input [7 : 0] din
.wr_en(post), // input wr_en
.rd_en(txCmdValid), // input rd_en
.dout(txCmd), // output [7 : 0] dout
.full(txCmdClkBridgeFull), // output full
.empty(txCmdClkBridgeEmpty) // output empty
);
//
// TRANSMIT: FPGA TO PC
//
assign SPI_MISO = txMemData[bitIndex];
reg [2:0] bitIndex;
reg [AddrBits-1:0] byteAddr;
assign txMemAddr = byteAddr;
reg [7:0] debug_reg;
assign debug_out = debug_reg;
initial begin
debug_reg <= 8'h00;
//rcState <= 0;
end
//
// Clocked logic
//
always @(posedge SPI_CLK) begin
if (Reset) begin
bitIndex <= 3'd0;
byteAddr <= 0;
end else if (SPI_SS == 1'b0) begin
bitIndex <= bitIndex - 3'd1;
if (bitIndex == 3'd1) begin
byteAddr <= byteAddr + 1;
end
end
end
//
// RECEIVE: PC TO FPGA
//
// Detect start of receive
reg ss_prev;
wire ss_negedge;
always @(posedge SysClk) begin
ss_prev <= SPI_SS;
end
assign ss_negedge = (ss_prev == 1'b1 && SPI_SS == 1'b0 ? 1'b1 : 1'b0);
`define RC_MODE_GET_STATUS 8'd0
`define RC_MODE_GET_BUFFER 8'd1
`define RC_MODE_PUT_BUFFER 8'd2
reg [7:0] rcMode;
`define RC_STATE_CMD 8'd0
`define RC_STATE_SIZE 8'd1
`define RC_STATE_PAYLOAD 8'd2
reg [7:0] rcState;
reg [31:0] rcByteCount;
reg [31:0] rcByteSize;
reg [7:0] rcMemData_reg;
reg [AddrBits-1:0] rcMemAddr_reg;
reg rcMemWE_reg;
assign rcMemData = rcMemData_reg;
assign rcMemAddr = rcMemAddr_reg;
assign rcMemWE = rcMemWE_reg;
always @(posedge SysClk) begin
// // About to receive
// if (ss_negedge) begin
// rcBitIndex <= 3'd7;
// rcState <= `RC_STATE_CMD;
//
// debug_reg[0] <= 1;
// end
//
// // Receiving
// if (receiving) begin
// rcByte[rcBitIndex] <= SPI_MOSI;
// rcBitIndex <= rcBitIndex - 3'd1;
// end
// rcByte_valid <= (receiving && rcBitIndex == 3'd0 ? 1'b1 : 1'b0);
// Handle the complete incoming byte
if (rcByte_valid) begin
debug_reg[7:4] <= rcByte[3:0];
// First byte: the command
if (`RC_STATE_CMD == rcState || ss_negedge) begin
// Disable writing to the read buffer (will be left on if the prev
// cycle was writing to it)
rcMemWE_reg <= 1'b0;
debug_reg[0] <= 1;
// Decode the SPI command
case (rcByte)
`RC_MODE_GET_STATUS: begin end // no status yet
`RC_MODE_GET_BUFFER: begin rcMode <= `RC_MODE_GET_BUFFER; rcState <= `RC_STATE_SIZE; end
`RC_MODE_PUT_BUFFER: begin rcMode <= `RC_MODE_PUT_BUFFER; rcState <= `RC_STATE_SIZE; end
endcase
// Initialize counters
rcByteCount <= 32'd0;
rcByteSize <= 32'd0;
end
// Record size (in bytes) of payload
if (`RC_STATE_SIZE == rcState) begin
debug_reg[1] <= 1;
case (rcByteCount)
32'd0: begin rcByteSize[31:24] <= rcByte; rcByteCount <= 32'd1; end
32'd1: begin rcByteSize[23:16] <= rcByte; rcByteCount <= 32'd2; end
32'd2: begin rcByteSize[15: 8] <= rcByte; rcByteCount <= 32'd3; end
32'd3: begin
rcByteSize[ 7: 0] <= rcByte;
rcByteCount <= 32'd0;
rcState <= `RC_STATE_PAYLOAD;
rcByteCount <= 32'd0;
if (`RC_MODE_GET_BUFFER == rcMode) begin
// TODO: want reset tx byte addr here probably
end
end
endcase
end
// The payload
if (rcState == `RC_STATE_PAYLOAD) begin
debug_reg[2] <= 1;
case (rcMode)
`RC_MODE_GET_BUFFER: begin
// IGNORE EVERYTHING SO STUFF CAN BE READ OUT
end
`RC_MODE_PUT_BUFFER: begin
//debug_reg[4] <= 1;
rcMemWE_reg <= 1'b1;
rcMemData_reg <= rcByte;
rcMemAddr_reg <= rcByteCount[AddrBits-1:0];
end
endcase
if (rcByteCount == rcByteSize - 1) begin
rcState <= `RC_STATE_CMD;
//debug_reg[5] <= 1;
end else begin
rcByteCount <= rcByteCount + 32'd1;
end
end
end
else begin // not valid byte
if (ss_negedge) begin
rcState <= `RC_STATE_CMD;
end
end
end
//reg [7:0] rcByteReg;
//wire [7:0] rcByte;
//assign rcByte = {rcByteReg[7:1], (SPI_SS == 1'b0 && bitIndex ==
// //
// // Receive (GPU to SPI)
// //
// reg SPI_SS_prev_cycle;
//
// // This is the register backing rcByteId. It is always one cycle
// // behind the true value of rcByteId, which we have to do a little
// // work to get instantaneously correct using wire logic.
// reg [31:0] rcByteIdPrev;
// wire [31:0] rcByteId;
// assign rcByteId = (SPI_SS_prev_cycle == 1 && SPI_SS == 0 ? 32'd0 : 32'd1 + rcByteIdPrev);
//
// // 1 if we're receiving from GPC, 0 if not.
// wire isRecv;
// assign isRecv = ~SPI_SS;
//
// // Bits to Byte aggregator
// reg [2:0] rcBitId;
// reg [7:0] rcByte;
//
//
// reg [31:0] rcSizeBytes;
//
// always @(posedge SPI_CLK) begin
// if (1 == isRecv) begin
// case (rcByteId)
// 0: rcSizeBytes[ 7: 0] <=
// end
//
// // Update registers for next cycle
// SPI_SS_prev_cycle <= SPI_SS;
// rcByteId <= rcByteIdPrev;
// end
*/
endmodule
src/spi_base/spiloop.v 0 → 100644
View file @ ebe882e3
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 17:49:15 11/02/2011
// Design Name:
// Module Name: spiwrap
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module spiloop(
input Reset,
input SysClk,
input spi_ss,
input spi_mosi,
input spi_clk,
output spi_miso,
output [7:0] leds
);
wire [7:0] debug_out;
wire [11:0] txMemAddr;
wire [7:0] txMemData;
wire [11:0] rcMemAddr;
wire [7:0] rcMemData;
wire rcMemWE;
spiloopmem your_instance_name (
.clka(spi_clk), // input clka
.ena(1'b1), // input ena
.wea(rcMemWE), // input [0 : 0] wea
.addra(rcMemAddr), // input [11 : 0] addra
.dina(rcMemData), // input [7 : 0] dina
.clkb(spi_clk), // input clkb
.enb(1'b1), // input enb
.addrb(txMemAddr), // input [11 : 0] addrb
.doutb(txMemData) // output [7 : 0] doutb
);
spiifc mySpiIfc (
.Reset(Reset),
.SysClk(SysClk),
.SPI_CLK(spi_clk),
.SPI_MISO(spi_miso),
.SPI_MOSI(spi_mosi),
.SPI_SS(spi_ss),
.txMemAddr(txMemAddr),
.txMemData(txMemData),
.rcMemAddr(rcMemAddr),
.rcMemData(rcMemData),
.rcMemWE(rcMemWE),
.debug_out(debug_out)
);
assign leds = debug_out ;
endmodule
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