Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Signed-off-by: Clifford Wolf <clifford@clifford.at>
- Loading branch information
1 parent
b634224
commit 1afe3af
Showing
7 changed files
with
341 additions
and
8 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| # 12 MHz clock | ||
| set_io clk 35 | ||
|
|
||
| # RS232 | ||
| set_io ser_rx 6 | ||
| set_io ser_tx 9 | ||
|
|
||
| # SPI Flash | ||
| set_io flash_clk 15 | ||
| set_io flash_csb 16 | ||
| set_io flash_io0 14 | ||
| set_io flash_io1 17 | ||
| set_io flash_io2 12 | ||
| set_io flash_io3 13 | ||
|
|
||
| # LEDs (PMOD 2) | ||
| set_io led1 27 | ||
| set_io led2 25 | ||
| set_io led3 21 | ||
| set_io led4 23 | ||
| set_io led5 26 | ||
|
|
||
| # Onboard LEDs | ||
| set_io ledr_n 11 | ||
| set_io ledg_n 37 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| /* | ||
| * PicoSoC - A simple example SoC using PicoRV32 | ||
| * | ||
| * Copyright (C) 2017 Clifford Wolf <clifford@clifford.at> | ||
| * | ||
| * Permission to use, copy, modify, and/or distribute this software for any | ||
| * purpose with or without fee is hereby granted, provided that the above | ||
| * copyright notice and this permission notice appear in all copies. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
| * | ||
| */ | ||
|
|
||
| module icebreaker ( | ||
| input clk, | ||
|
|
||
| output ser_tx, | ||
| input ser_rx, | ||
|
|
||
| output led1, | ||
| output led2, | ||
| output led3, | ||
| output led4, | ||
| output led5, | ||
|
|
||
| output ledr_n, | ||
| output ledg_n, | ||
|
|
||
| output flash_csb, | ||
| output flash_clk, | ||
| inout flash_io0, | ||
| inout flash_io1, | ||
| inout flash_io2, | ||
| inout flash_io3 | ||
| ); | ||
| reg [5:0] reset_cnt = 0; | ||
| wire resetn = &reset_cnt; | ||
|
|
||
| always @(posedge clk) begin | ||
| reset_cnt <= reset_cnt + !resetn; | ||
| end | ||
|
|
||
| wire [7:0] leds; | ||
|
|
||
| assign led1 = leds[1]; | ||
| assign led2 = leds[2]; | ||
| assign led3 = leds[3]; | ||
| assign led4 = leds[4]; | ||
| assign led5 = leds[5]; | ||
|
|
||
| assign ledr_n = !leds[6]; | ||
| assign ledg_n = !leds[7]; | ||
|
|
||
| wire flash_io0_oe, flash_io0_do, flash_io0_di; | ||
| wire flash_io1_oe, flash_io1_do, flash_io1_di; | ||
| wire flash_io2_oe, flash_io2_do, flash_io2_di; | ||
| wire flash_io3_oe, flash_io3_do, flash_io3_di; | ||
|
|
||
| SB_IO #( | ||
| .PIN_TYPE(6'b 1010_01), | ||
| .PULLUP(1'b 0) | ||
| ) flash_io_buf [3:0] ( | ||
| .PACKAGE_PIN({flash_io3, flash_io2, flash_io1, flash_io0}), | ||
| .OUTPUT_ENABLE({flash_io3_oe, flash_io2_oe, flash_io1_oe, flash_io0_oe}), | ||
| .D_OUT_0({flash_io3_do, flash_io2_do, flash_io1_do, flash_io0_do}), | ||
| .D_IN_0({flash_io3_di, flash_io2_di, flash_io1_di, flash_io0_di}) | ||
| ); | ||
|
|
||
| wire iomem_valid; | ||
| reg iomem_ready; | ||
| wire [3:0] iomem_wstrb; | ||
| wire [31:0] iomem_addr; | ||
| wire [31:0] iomem_wdata; | ||
| reg [31:0] iomem_rdata; | ||
|
|
||
| reg [31:0] gpio; | ||
| assign leds = gpio; | ||
|
|
||
| always @(posedge clk) begin | ||
| if (!resetn) begin | ||
| gpio <= 0; | ||
| end else begin | ||
| iomem_ready <= 0; | ||
| if (iomem_valid && !iomem_ready && iomem_addr[31:24] == 8'h 03) begin | ||
| iomem_ready <= 1; | ||
| iomem_rdata <= gpio; | ||
| if (iomem_wstrb[0]) gpio[ 7: 0] <= iomem_wdata[ 7: 0]; | ||
| if (iomem_wstrb[1]) gpio[15: 8] <= iomem_wdata[15: 8]; | ||
| if (iomem_wstrb[2]) gpio[23:16] <= iomem_wdata[23:16]; | ||
| if (iomem_wstrb[3]) gpio[31:24] <= iomem_wdata[31:24]; | ||
| end | ||
| end | ||
| end | ||
|
|
||
| picosoc #( | ||
| .BARREL_SHIFTER(0), | ||
| .ENABLE_MULDIV(0) | ||
| ) soc ( | ||
| .clk (clk ), | ||
| .resetn (resetn ), | ||
|
|
||
| .ser_tx (ser_tx ), | ||
| .ser_rx (ser_rx ), | ||
|
|
||
| .flash_csb (flash_csb ), | ||
| .flash_clk (flash_clk ), | ||
|
|
||
| .flash_io0_oe (flash_io0_oe), | ||
| .flash_io1_oe (flash_io1_oe), | ||
| .flash_io2_oe (flash_io2_oe), | ||
| .flash_io3_oe (flash_io3_oe), | ||
|
|
||
| .flash_io0_do (flash_io0_do), | ||
| .flash_io1_do (flash_io1_do), | ||
| .flash_io2_do (flash_io2_do), | ||
| .flash_io3_do (flash_io3_do), | ||
|
|
||
| .flash_io0_di (flash_io0_di), | ||
| .flash_io1_di (flash_io1_di), | ||
| .flash_io2_di (flash_io2_di), | ||
| .flash_io3_di (flash_io3_di), | ||
|
|
||
| .irq_5 (1'b0 ), | ||
| .irq_6 (1'b0 ), | ||
| .irq_7 (1'b0 ), | ||
|
|
||
| .iomem_valid (iomem_valid ), | ||
| .iomem_ready (iomem_ready ), | ||
| .iomem_wstrb (iomem_wstrb ), | ||
| .iomem_addr (iomem_addr ), | ||
| .iomem_wdata (iomem_wdata ), | ||
| .iomem_rdata (iomem_rdata ) | ||
| ); | ||
| endmodule |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /* | ||
| * PicoSoC - A simple example SoC using PicoRV32 | ||
| * | ||
| * Copyright (C) 2017 Clifford Wolf <clifford@clifford.at> | ||
| * | ||
| * Permission to use, copy, modify, and/or distribute this software for any | ||
| * purpose with or without fee is hereby granted, provided that the above | ||
| * copyright notice and this permission notice appear in all copies. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
| * | ||
| */ | ||
|
|
||
| `timescale 1 ns / 1 ps | ||
|
|
||
| module testbench; | ||
| reg clk; | ||
| always #5 clk = (clk === 1'b0); | ||
|
|
||
| localparam ser_half_period = 53; | ||
| event ser_sample; | ||
|
|
||
| initial begin | ||
| $dumpfile("testbench.vcd"); | ||
| $dumpvars(0, testbench); | ||
|
|
||
| repeat (6) begin | ||
| repeat (50000) @(posedge clk); | ||
| $display("+50000 cycles"); | ||
| end | ||
| $finish; | ||
| end | ||
|
|
||
| integer cycle_cnt = 0; | ||
|
|
||
| always @(posedge clk) begin | ||
| cycle_cnt <= cycle_cnt + 1; | ||
| end | ||
|
|
||
| wire led1, led2, led3, led4, led5; | ||
| wire ledr_n, ledg_n; | ||
|
|
||
| wire [6:0] leds = {!ledg_n, !ledr_n, led5, led4, led3, led2, led1}; | ||
|
|
||
| wire ser_rx; | ||
| wire ser_tx; | ||
|
|
||
| wire flash_csb; | ||
| wire flash_clk; | ||
| wire flash_io0; | ||
| wire flash_io1; | ||
| wire flash_io2; | ||
| wire flash_io3; | ||
|
|
||
| always @(leds) begin | ||
| #1 $display("%b", leds); | ||
| end | ||
|
|
||
| icebreaker uut ( | ||
| .clk (clk ), | ||
| .led1 (led1 ), | ||
| .led2 (led2 ), | ||
| .led3 (led3 ), | ||
| .led4 (led4 ), | ||
| .led5 (led5 ), | ||
| .ledr_n (ledr_n ), | ||
| .ledg_n (ledg_n ), | ||
| .ser_rx (ser_rx ), | ||
| .ser_tx (ser_tx ), | ||
| .flash_csb(flash_csb), | ||
| .flash_clk(flash_clk), | ||
| .flash_io0(flash_io0), | ||
| .flash_io1(flash_io1), | ||
| .flash_io2(flash_io2), | ||
| .flash_io3(flash_io3) | ||
| ); | ||
|
|
||
| spiflash spiflash ( | ||
| .csb(flash_csb), | ||
| .clk(flash_clk), | ||
| .io0(flash_io0), | ||
| .io1(flash_io1), | ||
| .io2(flash_io2), | ||
| .io3(flash_io3) | ||
| ); | ||
|
|
||
| reg [7:0] buffer; | ||
|
|
||
| always begin | ||
| @(negedge ser_tx); | ||
|
|
||
| repeat (ser_half_period) @(posedge clk); | ||
| -> ser_sample; // start bit | ||
|
|
||
| repeat (8) begin | ||
| repeat (ser_half_period) @(posedge clk); | ||
| repeat (ser_half_period) @(posedge clk); | ||
| buffer = {ser_tx, buffer[7:1]}; | ||
| -> ser_sample; // data bit | ||
| end | ||
|
|
||
| repeat (ser_half_period) @(posedge clk); | ||
| repeat (ser_half_period) @(posedge clk); | ||
| -> ser_sample; // stop bit | ||
|
|
||
| if (buffer < 32 || buffer >= 127) | ||
| $display("Serial data: %d", buffer); | ||
| else | ||
| $display("Serial data: '%c'", buffer); | ||
| end | ||
| endmodule |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters