Fixes ohmpi_card_3_15 imports

hardware/mb_2024_rev_0_0.py

 import importlib
-from OhmPi.config import OHMPI_CONFIG
+from OhmPi.config import HARDWARE_CONFIG
 import adafruit_ads1x15.ads1115 as ads  # noqa
 from adafruit_ads1x15.analog_in import AnalogIn  # noqa
 from adafruit_mcp230xx.mcp23008 import MCP23008  # noqa
@@ -9,10 +9,10 @@ import time
 import numpy as np
 import os
 from OhmPi.hardware import TxAbstract, RxAbstract
-controller_module = importlib.import_module(f'OhmPi.hardware.{OHMPI_CONFIG["hardware"]["controller"]["model"]}')
+controller_module = importlib.import_module(f'OhmPi.hardware.{HARDWARE_CONFIG["hardware"]["controller"]["model"]}')
 
-TX_CONFIG = OHMPI_CONFIG['rx']
-RX_CONFIG = OHMPI_CONFIG['tx']
+TX_CONFIG = HARDWARE_CONFIG['tx']
+RX_CONFIG = HARDWARE_CONFIG['rx']
 
 # hardware characteristics and limitations
 # *** RX ***

hardware/ohmpi_card_3_15.py

@@ -11,8 +11,8 @@ import os
 from OhmPi.hardware import TxAbstract, RxAbstract
 controller_module = importlib.import_module(f'OhmPi.hardware.raspberry_pi_3')
 
-TX_CONFIG = HARDWARE_CONFIG['rx']
-RX_CONFIG = HARDWARE_CONFIG['tx']
+TX_CONFIG = HARDWARE_CONFIG['tx']
+RX_CONFIG = HARDWARE_CONFIG['rx']
 
 # hardware characteristics and limitations
 # *** RX ***