Add updated simpletest

Author: brentru

adafruit_atecc/adafruit_atecc.py

@@ -372,10 +372,7 @@ def sha_update(self, message):
                                 into the hash operation.
 
         """
-        if not hasattr(message, "append"):
-            message = pack("B", message)
         self.wakeup()
-        assert len(message) == 64, "Message provided to sha_update must be 64 bytes"
         self._send_command(OP_SHA, 0x01, 64, message)
         time.sleep(EXEC_TIME[OP_SHA]/1000)
         status = bytearray(1)

examples/atecc_simpletest.py

@@ -1,10 +1,34 @@
-# testing adafruit atecc module
-import board
-import adafruit_atecc
-import busio
-
-
-_WAKE_CLK_FREQ = 100000 # slower clock speed 	
-i2c = busio.I2C(board.SCL, board.SDA, frequency=_WAKE_CLK_FREQ)
-
-adafruit_atecc.ATECCx08A(i2c)
+import board
+import busio
+import time
+import adafruit_ssd1306
+from adafruit_atecc.adafruit_atecc import ATECC, _WAKE_CLK_FREQ
+
+# Initialize the i2c bus
+i2c = busio.I2C(board.SCL, board.SDA,
+                frequency=_WAKE_CLK_FREQ)
+
+# Initialize a new atecc object
+atecc = ATECC(i2c)
+
+print("ATECC Serial: ", atecc.serial_number)
+
+# Generate a random number with a maximum value of 1024
+print("Random Value: ", atecc.random(rnd_max=1024))
+
+# Print out the value from one of the ATECC's counters
+# You should see this counter increase on every time the code.py runs.
+print("ATECC Counter #1 Value: ", atecc.counter(1, increment_counter=True))
+
+# Initialize the SHA256 calculation engine
+atecc.sha_start()
+
+# Append bytes to the SHA digest
+print("Appending to the digest...")
+atecc.sha_update(b"Nobody inspects")
+print("Appending to the digest...")
+atecc.sha_update(b" the spammish repetition")
+
+# Return the digest of the data passed to sha_update
+message = atecc.sha_digest()
+print("SHA Digest: ", message)