diff options
Diffstat (limited to 'picosoc/icebreaker.v')
-rw-r--r-- | picosoc/icebreaker.v | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/picosoc/icebreaker.v b/picosoc/icebreaker.v new file mode 100644 index 0000000..a943bc6 --- /dev/null +++ b/picosoc/icebreaker.v @@ -0,0 +1,151 @@ +/* + * PicoSoC - A simple example SoC using PicoRV32 + * + * Copyright (C) 2017 Claire Xenia Wolf <claire@yosyshq.com> + * + * 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. + * + */ + +`ifdef PICOSOC_V +`error "icebreaker.v must be read before picosoc.v!" +`endif + +`define PICOSOC_MEM ice40up5k_spram + +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 +); + parameter integer MEM_WORDS = 32768; + + 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_MUL(0), + .ENABLE_DIV(0), + .ENABLE_FAST_MUL(1), + .MEM_WORDS(MEM_WORDS) + ) 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 |