Add ATtiny13a board definitions, example upload code, and blink hex file.

adafruit_avrprog.py

@@ -59,6 +59,14 @@ class AVRprog:
       """
       Some well known board definitions
       """
+      ATtiny13a = {
+        'name': "ATtiny13a",
+        'sig': [0x1E, 0x90, 0x07],
+        'flash_size': 1024,
+        'page_size': 32,
+        'fuse_mask': (0xFF, 0xFF, 0x00, 0x03),
+        'clock_speed': 100000
+      }
       ATtiny85 = {
         'name': "ATtiny85",
         'sig': [0x1E, 0x93, 0x0B],

examples/attiny13a_blink.hex

@@ -0,0 +1,6 @@
+:1000000009C00EC00DC00CC00BC00AC009C008C09A
+:1000100007C006C011241FBECFE9CDBF02D012C059
+:10002000EFCF81E087BB18BA98E088B3892788BBF7
+:100030002FEF35EA8EE0215030408040E1F700C0DC
+:080040000000F3CFF894FFCF9C
+:00000001FF

examples/avrprog_program_tiny13a.py

@@ -0,0 +1,44 @@
+"""
+ATtiny13a programming example, be sure you have the '13a wired up so:
+  ATtiny13a GND to CircuitPython GND
+  ATtiny13a VCC to CircuitPython USB
+  Pin 2 -> CircuitPython SCK
+  Pin 1 -> CircuitPython MISO
+  Pin 0 -> CircuitPython MOSI
+  RESET  -> CircuitPython D5 (or change the init() below to change it!)
+Drag "attiny13a_blink.hex" onto the CircuitPython disk drive, then open REPL!
+"""
+
+import board
+import busio
+import adafruit_avrprog
+
+spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
+avrprog = adafruit_avrprog.AVRprog()
+avrprog.init(spi, board.D5)
+
+# Each chip has to have a definition so the script knows how to find it
+attiny13 = avrprog.Boards.ATtiny13a
+
+def error(err):
+    """ Helper to print out errors for us and then halt """
+    print("ERROR: "+err)
+    avrprog.end()
+    while True:
+        pass
+
+while input("Ready to GO, type 'G' here to start> ") != 'G':
+    pass
+
+if not avrprog.verify_sig(attiny13, verbose=True):
+    error("Signature read failure")
+print("Found", attiny13['name'])
+
+avrprog.write_fuses(attiny13, low=0x7A, high=0xFF)
+if not avrprog.verify_fuses(attiny13, low=0x7A, high=0xFF):
+    error("Failure verifying fuses!")
+
+print("Programming flash from file")
+avrprog.program_file(attiny13, "attiny13a_blink.hex", verbose=True, verify=True)
+
+print("Done!")