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Added OrangeCrab board-specific code to connect the cpu to the outside world

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This commit is contained in:
(Tim) Efthimis Kritikos 2023-11-02 20:40:04 +00:00
parent 5feee9de57
commit 36bf8f9c7a
3 changed files with 61 additions and 6 deletions
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2
system/Makefile
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@ -64,7 +64,7 @@ else
$(error invalid ECP5 device ${ECP5_DEVICE})
endif
ECP5_TARGETS=synth_ecp5.json synth_ecp5_out.config synth_ecp5.bit synth_ecp5.dfu
ECP5_TARGETS=synth_ecp5.json synth_ecp5_out.config synth_ecp5.bit synth_ecp5.dfu fpga_config/${FPGA_BOARD}/fpga_top.v
ECP5_TARGETS+=abc.history # created from yosys
synth_ecp5.json: ${SOURCES} ${TOP_LEVEL_SOURCE} ${INCLUDES} boot_code.txt

55
system/fpga_config/OrangeCrab_r0.2.1/fpga_top.v Normal file
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@ -0,0 +1,55 @@
/* top.v - Implements FPGA and Board specific circuitry
This file is part of the 9086 project.
Copyright (c) 2023 Efthymios Kritikos
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
`include "error_header.v"
module fpga_top(
input clk48,
input user_button;
output reset_n;
output reg rgb_led0_r;
output reg rgb_led0_g;
output reg rgb_led0_b;
);
wire HALT,[`ERROR_BITS-1:0]ERROR;
system system(
/* MISC */ clk48,user_button,HALT,ERROR
/* MEMORY / IO */ ,address_bus,data_bus,rd,wr,BHE,IOMEM
)
always @(HALT or ERROR or user_button) begin
if (HALT==0) begin
/* yellow */
rgb_led_r=0;
rgb_led_g=0;
rgb_led_b=1;
end else if (ERROR != `ERROR_BITS'b0) begin
/* red */
rgb_led_r=0;
rgb_led_g=1;
rgb_led_b=1;
end else begin
rgb_led_r=1;
rgb_led_g=0;
rgb_led_b=1;
end
end

8
system/fpga_config/OrangeCrab_r0.2.1/pin_constraint.pcf
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@ -232,10 +232,10 @@ IOBUF PORT "gpio_a2" PULLMODE=DOWN;
LOCATE COMP "gpio_a3" SITE "H4";
IOBUF PORT "gpio_a3" IO_TYPE=LVCMOS33;
IOBUF PORT "gpio_a3" PULLMODE=DOWN;
LOCATE COMP "usr_btn" SITE "J17";
IOBUF PORT "usr_btn" IO_TYPE=SSTL135_I;
LOCATE COMP "rst_n" SITE "V17";
IOBUF PORT "rst_n" IO_TYPE=LVCMOS33;
LOCATE COMP "user_button" SITE "J17";
IOBUF PORT "user_button" IO_TYPE=SSTL135_I;
LOCATE COMP "reset_n" SITE "V17";
IOBUF PORT "reset_n" IO_TYPE=LVCMOS33;
LOCATE COMP "spiflash4x_cs_n" SITE "U17";
IOBUF PORT "spiflash4x_cs_n" IO_TYPE=LVCMOS33;
LOCATE COMP "spiflash4x_dq[0]" SITE "U18";