newStep.v

RTL/DEVICES/HardwareConfig.v

@@ -0,0 +1,59 @@
+// femtorv32, a minimalistic RISC-V RV32I core
+//       Bruno Levy, 2020-2021
+//
+// This file: memory-mapped constants to query 
+//   hardware config.
+
+module HardwareConfig(
+    input wire 	       clk, 
+    input wire 	       sel_memory,  // available RAM
+    input wire 	       sel_devices, // configured devices 
+    input wire         sel_cpuinfo, // CPU information 	      
+    output wire [31:0] rdata        // read data
+);
+
+`include "HardwareConfig_bits.v"   
+
+`ifdef NRV_COUNTER_WIDTH
+   localparam counter_width = `NRV_COUNTER_WIDTH;
+`else
+   localparam counter_width = 32;
+`endif   
+
+   
+// configured devices
+localparam NRV_DEVICES = 0
+`ifdef NRV_IO_LEDS
+   | (1 << IO_LEDS_bit)			 
+`endif			    
+`ifdef NRV_IO_UART
+   | (1 << IO_UART_DAT_bit) | (1 << IO_UART_CNTL_bit)
+`endif			    
+`ifdef NRV_IO_SSD1351_1331
+   | (1 << IO_SSD1351_CNTL_bit) | (1 << IO_SSD1351_CMD_bit) | (1 << IO_SSD1351_DAT_bit)  
+`endif			    
+`ifdef NRV_IO_MAX7219     
+   | (1 << IO_MAX7219_DAT_bit) 
+`endif			    
+`ifdef NRV_IO_SPI_FLASH
+   | (1 << IO_SPI_FLASH_bit) 			 
+`endif			    
+`ifdef NRV_MAPPED_SPI_FLASH
+   | (1 << IO_MAPPED_SPI_FLASH_bit) 			 
+`endif			    
+`ifdef NRV_IO_SDCARD
+   | (1 << IO_SDCARD_bit) 			 			 
+`endif			    
+`ifdef NRV_IO_BUTTONS
+   | (1 << IO_BUTTONS_bit) 			 			 			 
+`endif 
+`ifdef NRV_IO_FGA
+   | (1 << IO_FGA_CNTL_bit) | (1 << IO_FGA_DAT_bit)
+`endif			 
+;
+   
+   assign rdata = sel_memory  ? `NRV_RAM  :
+		  sel_devices ?  NRV_DEVICES :
+                  sel_cpuinfo ? (`NRV_FREQ << 16) | counter_width : 32'b0;
+   
+endmodule