Abstract: A tool for replacing a code image in an embedded device including a control program for issuing device commands in order to replace a code image within the embedded device. A monitoring program, operating asynchronously with respect to the control program, generates event indications in response to detecting a change in an attribute associated with the embedded device. The disclosed monitoring program issues device commands and receives event indications. Separate threads of control are used for monitoring and controlling the device being upgraded, and each step of the upgrade process is abstracted as a device independent command. The disclosed system further uses a state machine to keep track of where the device is in the upgrade process.

Abstract: A method and circuit for controlling a reference voltage for an analog-to-digital converter having plural outputs includes a sensor for indicating when outputs from the A/D converter are at least a desired voltage, and a processor responsive to the sensor and connected to a digital-to-analog converter which provides a reference voltage for the A/D converter. The processor provides signals to the D/A converter which change the reference voltage. A logic unit in the processor increments an accumulator when either an I or a Q component in the A/D converter output is at least the desired voltage and decrements the accumulator when neither the I nor the Q component is at least the desired voltage. A counter may buffer the accumulator changes by using only several of the most significant bits of the counter to change the A/D converter reference voltage.