Update sw/vuart/spec7_vuart.py

968517cd · Ton Damen · Pascal Bos · 9937dc8e · 968517cd
Commit 968517cd authored Sep 07, 2020 by Ton Damen Committed by Pascal Bos Sep 21, 2020
Hide whitespace changes
Inline Side-by-side

Showing with 88 additions and 0 deletions

spec7_vuart.py sw/vuart/spec7_vuart.py +88 -0

No files found.
--- a/sw/vuart/spec7_vuart.py
+++ b/sw/vuart/spec7_vuart.py
+#!/usr/bin/python3
+#
+# Simple terminal interface to the uart of the WR core
+#
+# Depending on the presents of the Xilinx XDMA driver
+# Based on the Single AXI4 memory mapped (MM) user interface of the The Xilinx
+# DMA/Bridge Subsystem for PCI Express (pg195)
+#
+# Author: Ton Damen, tond@nikhef.nl
+# Date: 8/4/2020
+#
+
+import os
+import sys
+import argparse
+import time
+import termios
+import pdb
+
+syscon_addr = 0x20400
+vuart_addr = 0x20500
+xmda_user_fd = 0;
+
+parser = argparse.ArgumentParser(description='Terminal interface to the uart of the wr core on the SPEC card')
+parser.add_argument('--device', '-d', default='/dev/xdma0_user', help = 'device path name, default is /dev/xdma0_user')
+
+args = parser.parse_args()
+
+def str2int(s):
+	try:
+		if (len(s) > 0 and s[0:2] == '0x'):
+			val = int(s[2:], 16)
+		else:
+			val = int(s)
+		return val
+	except ValueError:
+		sys.exit('Invalid value: {}'.format(s))
+
+def vuart_getc():
+	while True:
+		data = os.pread(xdma_user_fd, 4, vuart_addr + 0x14)
+		rx_reg = int.from_bytes(data, "little")
+		if (rx_reg & 0x100) != 0:
+			return rx_reg & 0xff
+		else:
+			return -1
+
+def vuart_putc(c):	
+	while True:
+		data = os.pread(xdma_user_fd, 4, vuart_addr + 0x10)
+		if (int.from_bytes(data, "little") & 0x100) != 0:
+			break
+		time.sleep(0.1)
+	os.pwrite(xdma_user_fd, c.to_bytes(4, 'little'), vuart_addr + 0x10)
+	
+stdio_fd = sys.stdin.fileno()
+old = termios.tcgetattr(stdio_fd)
+new = termios.tcgetattr(stdio_fd)
+# [iflag, oflag, cflag, lflag, ispeed, ospeed, cc]
+new[0] = termios.IGNPAR
+new[1] = 0
+new[2] = termios.B9600 | termios.CS8 | termios.CLOCAL | termios.CREAD
+new[3] = 0
+new[6][termios.VMIN] = 0
+new[6][termios.VTIME] = 0
+
+print('Type C-a to exit\n')
+
+try:
+    termios.tcsetattr(stdio_fd, termios.TCSADRAIN, new)
+    xdma_user_fd = os.open(args.device, os.O_RDWR)
+    while True:
+        key = sys.stdin.read(1)
+        if (len(key) > 0):
+            if key == chr(1):
+                break
+            else:
+                vuart_putc(ord(key))
+        c = vuart_getc()
+        if c > 0:
+            sys.stdout.write(chr(c))
+            sys.stdout.flush()
+		
+except OSError as error: 
+    sys.exit('Device i/o failed: {}'.format(error))
+
+finally:
+    termios.tcsetattr(stdio_fd, termios.TCSADRAIN, old)