Modified the write with a hardcoded delay to avoid ack on every write.

arduino_programs/arduino_programmer/arduino_programmer.ino

@@ -245,8 +245,6 @@ void program() {
     while(Serial.available() == 0);
     value = Serial.read();
     writeEEPROM(addr, value, true);
-    // Send ack.
-    Serial.write(value);
   }
 }
 

cli/cli.py

@@ -1,6 +1,7 @@
 import argparse
 import time
 import serial
+from tqdm import tqdm
 
 
 def get_parsed_args():
@@ -82,17 +83,19 @@ def program(args):
         # Sending command
         ser.write((0).to_bytes(1, "big"))
 
-        bytesToWrite = args.file.read()
+        bytes_to_write = args.file.read()
         # Forward the bytes from the selected file
-        for i in range(32 * 1024):
-            # Show progress.
-            if i % 1024 == 0:
-                print(".", end="")
-            value = (bytesToWrite[i]).to_bytes(1, "big")
+        for i in tqdm(range(32 * 1024)):
+            value = (bytes_to_write[i]).to_bytes(1, "big")
             ser.write(value)
-            if value != ser.read():
-                # There was an error with the ack, finish early.
-                break
+            # This delay was found by experimentation.
+            # A byte write in the arduino takes about 80us.
+            # Every 64 bytes (a page) we do data polling and could
+            # take much longer. A byte send given a 115200 baud rate
+            # should take ~70us, a 100us delay should give the EEPROM enough time
+            # to internally write the page withouh the UART read buffer (64 bytes)
+            # overflowing.
+            time.sleep(100.0 * 1e-6)
         print("Done programming!")
 
 

cli/requirements.txt

@@ -0,0 +1,17 @@
+appdirs==1.4.4
+astroid==2.4.2
+isort==5.6.4
+jedi==0.17.2
+lazy-object-proxy==1.4.3
+mccabe==0.6.1
+mypy-extensions==0.4.3
+parso==0.7.1
+pathspec==0.8.1
+pylint==2.6.0
+pyserial==3.5
+rope==0.18.0
+six==1.15.0
+toml==0.10.2
+tqdm==4.54.1
+typing-extensions==3.7.4.3
+wrapt==1.12.1