Picosoc fusesoc

examples/picosoc/Makefile

@@ -20,6 +20,8 @@ firmware.elf: sections.lds start.S firmware.c
 firmware.bin: firmware.elf
 	riscv32-unknown-elf-objcopy -O binary firmware.elf /dev/stdout > firmware.bin
 
+firmware.hex: firmware.elf
+	riscv32-unknown-elf-objcopy -O verilog firmware.elf firmware.hex
 
 clean:
 	rm -f firmware.elf firmware.hex firmware.bin firmware.o firmware.map \

examples/picosoc/hardware.v

@@ -121,6 +121,7 @@ module hardware (
     end
 
     picosoc #(
+        .ENABLE_IRQ_QREGS(1),
         .PROGADDR_RESET(32'h0005_0000), // beginning of user space in SPI flash
         .PROGADDR_IRQ(32'h0005_0010),
         .MEM_WORDS(2048)                // use 2KBytes of block RAM by default

examples/picosoc/hardware_tb.v

@@ -0,0 +1,56 @@
+module hardware_tb;
+
+   vlog_tb_utils vtu();
+
+   reg clk = 1'b1;
+   always #31 clk = !clk; //~16 MHz clock
+
+   wire user_led;
+
+   wire flash_csb;
+   wire flash_clk;
+   wire flash_io0;
+   wire flash_io1;
+   wire flash_io2;
+   wire flash_io3;
+
+   initial begin
+      repeat (2) begin
+	 @(posedge user_led);
+	 $display("LED is on");
+	 @(posedge user_led);
+	 $display("LED is off");
+      end
+      $finish;
+   end
+
+   hardware dut
+     (.clk_16mhz (clk),
+      // onboard USB interface
+      .pin_pu    (),
+      .pin_usbp  (),
+      .pin_usbn  (),
+      // hardware UART
+      .pin_1     (),
+      .pin_2     (1'b1),
+      // onboard LED
+      .user_led  (user_led),
+      // onboard SPI flash interface
+      .flash_csb (flash_csb),
+      .flash_clk (flash_clk),
+      .flash_io0 (flash_io0),
+      .flash_io1 (flash_io1),
+      .flash_io2 (flash_io2),
+      .flash_io3 (flash_io3));
+
+   AT25SF081
+     #(.tVSL (1000)) //Ensure flash is ready when reset is released
+   spiflash
+     (.SCLK   (flash_clk),
+      .CS_N   (flash_csb),
+      .SI     (flash_io0),
+      .HOLD_N (flash_io3),
+      .WP_N   (flash_io2),
+      .SO     (flash_io1));
+
+endmodule

examples/picosoc/picosoc.core

@@ -0,0 +1,33 @@
+CAPI=2:
+name : tinyfpga:bx:picosoc:0
+
+filesets:
+  rtl:
+    files:
+      - hardware.v : {file_type : verilogSource}
+    depend : [picosoc]
+  constraints:
+    files:
+      - hardware.pcf : {file_type : PCF}
+  tb:
+    files:
+      - hardware_tb.v : {file_type : verilogSource}
+    depend : [at25sf081, vlog_tb_utils, "yosys:techlibs:ice40"]
+
+targets:
+  synth:
+    default_tool : icestorm
+    filesets: [rtl, constraints]
+    tools:
+      icestorm:
+        arachne_pnr_options : [-d, 8k, -P, cm81]
+        nextpnr_options : [--lp8k, --package, cm81]
+        pnr: next
+    toplevel : hardware
+  sim:
+    default_tool: icarus
+    filesets: [rtl, tb]
+    tools:
+      modelsim:
+        vlog_options: [-timescale=1ns/100ps]
+    toplevel: hardware_tb

examples/picosoc/picosoc.v

@@ -59,6 +59,7 @@ module picosoc (
 	input  flash_io2_di,
 	input  flash_io3_di
 );
+	parameter [0:0] ENABLE_IRQ_QREGS = 0;
 	parameter integer MEM_WORDS = 256;
 	parameter [31:0] STACKADDR = (4*MEM_WORDS);       // end of memory
 	parameter [31:0] PROGADDR_RESET = 32'h 0005_0000; // 1 MB into flash
@@ -122,7 +123,7 @@ module picosoc (
 		.ENABLE_MUL(1),
 		.ENABLE_DIV(1),
 		.ENABLE_IRQ(1),
-		.ENABLE_IRQ_QREGS(1)
+		.ENABLE_IRQ_QREGS(ENABLE_IRQ_QREGS)
 	) cpu (
 		.clk         (clk        ),
 		.resetn      (resetn     ),