diff --git a/fast-servo/pyfastservo/adc.py b/fast-servo/pyfastservo/adc.py
index 9cbe137..2f7efe1 100644
--- a/fast-servo/pyfastservo/adc.py
+++ b/fast-servo/pyfastservo/adc.py
@@ -19,6 +19,7 @@
 
 
 import spidev
+import json
 from pyfastservo.common import (
     ADC_AFE_CTRL_ADDR,
     ADC_BITSLIP_ADDR,
@@ -113,11 +114,12 @@ def find_edge():
 def read_adc_channel(high_addr, low_addr):
     return (read_from_memory(high_addr, 1)[0] << 8) | read_from_memory(low_addr, 1)[0]
 
-def print_adc_channels():
+def get_adc_channels():
     adc_ch0 = read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
     adc_ch1 = read_adc_channel(ADC_CH1_HIGH_ADDR, ADC_CH1_LOW_ADDR)
     print(f"Final ADC_CH0: 0x{adc_ch0:04x}")
     print(f"Final ADC_CH1: 0x{adc_ch1:04x}")
+    return adc_ch0, adc_ch1
 
 def enable_adc_afe(ch1_x10=False, ch2_x10=False):
     ctrl_value = (ch2_x10 << 1) | ch1_x10
@@ -147,7 +149,10 @@ def configure_ltc2195():
         # Performing Word Align
         perform_bitslip()
         find_edge()
-        print_adc_channels()
+        adc_ch0, adc_ch1 = get_adc_channels()
+
+        with open('adc_values.json', 'w') as f:
+            json.dump({'adc_ch0': adc_ch0, 'adc_ch1': adc_ch1}, f)
 
         main_adc_test_mode(spi, False)
         verify_adc_registers(spi, {0x02: 0x11})  # Verify test mode is off
diff --git a/fast-servo/pyfastservo/loopback.py b/fast-servo/pyfastservo/loopback.py
index 12f0a8e..a45c936 100644
--- a/fast-servo/pyfastservo/loopback.py
+++ b/fast-servo/pyfastservo/loopback.py
@@ -1,3 +1,4 @@
+import json
 import time
 from pyfastservo import adc, dac
 from pyfastservo.common import (
@@ -8,11 +9,26 @@ from pyfastservo.common import (
     read_from_memory,
     write_to_memory
 )
-###
+
+try:
+    with open('adc_values.json', 'r') as f:
+        adc_values = json.load(f)
+    INITIALIZED_ADC_CH0 = int(adc_values['adc_ch0'], 16)  # Convert hex string to int
+    INITIALIZED_ADC_CH1 = int(adc_values['adc_ch1'], 16)  # Convert hex string to int
+except FileNotFoundError:
+    print("Warning: ADC initialization values not found. Using default addresses.")
+    INITIALIZED_ADC_CH0 = None
+    INITIALIZED_ADC_CH1 = None
 
 def read_adc():
-    adc_value = adc.read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
-    return adc_value
+    if INITIALIZED_ADC_CH0 is not None:
+        return INITIALIZED_ADC_CH0
+    else:
+        return adc.read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
+
+# def read_adc():
+#     adc_value = adc.read_adc_channel(ADC_CH0_HIGH_ADDR, ADC_CH0_LOW_ADDR)
+#     return adc_value
 
 def write_dac(value):
     dac.set_dac_output(value)
@@ -42,7 +58,7 @@ def perform_loopback_test(test_value):
         print(f"Expected: {test_value}, ADC: {adc_value}, DAC: {dac_value}")
 
 def main():
-    test_value = 0x2000  # Mid-range value (8192 in decimal)
+    test_value = 0x3F3F  # Mid-range value (8192 in decimal)
     perform_loopback_test(test_value)
 
 if __name__ == "__main__":