Flash sample initial version

python/samples/flash.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+
+from spidriver import SPIDriver
+import struct
+import time
+import sys
+import getopt
+
+def hexdump(s):
+    def toprint(c):
+        if 32 <= ord(c) < 127:
+            return c
+        else:
+            return "."
+    def hexline(s):
+        return (" ".join(["%02x" % ord(c) for c in s]).ljust(49) +
+                "|" +
+                "".join([toprint(c) for c in s]).ljust(16) +
+                "|")
+    return "\n".join([hexline(s[i:i+16]) for i in range(0, len(s), 16)])
+
+def rnd(n):
+    return random.randrange(n)
+
+
+def pattern(n):
+    return [rnd(256) for i in range(n)]
+
+if __name__ == '__main__':
+    try:
+        optlist, args = getopt.getopt(sys.argv[1:], "h:")
+    except getopt.GetoptError as reason:
+        print()
+        print('usage: st7735 [ -h device ] image...')
+        print()
+        print()
+        sys.exit(1)
+    optdict = dict(optlist)
+
+    s = SPIDriver(optdict.get('-h', "/dev/ttyUSB0"))
+
+    while True:
+        s.sel()               # start command
+        s.write(b'\x9f')      # command 9F is READ JEDEC ID 
+        ids = s.read(3)
+        (id1, id2, id3) = struct.unpack("BBB", ids)
+        print ("JEDEC ID: %02x %02x %02x" % (id1, id2, id3))
+        s.unsel()             # end command
+        time.sleep(.02)
+        if id1 not in (0x00, 0xff):
+            break
+
+    for c in (0x66, 0x99):
+        s.sel()               # start command
+        s.write(bytes([c]))
+        s.unsel()
+        time.sleep(.2)
+
+    s.sel()               # start command
+    s.write([0x03, 0x00, 0x00, 0x00])
+    page = s.read(256)
+    print(hexdump(page))
+    s.unsel()             # end command
+    time.sleep(.02)