Hardware-based graphics interface for medical device sensors and controllers

A hardware-based graphics controller and therapeutic electric current generator apparatus comprising:

• a timer;
• a current source with a conditioning circuit and an output;
• an ammeter configured to measure the current source output;
• a liquid crystal display (LCD);
• a random-access memory (RAM) frame buffer connected with the LCD;
• a programmable logic device (PLD) comprising a series of logic gates, the PLD connected with the timer, the ammeter, and the LCD;
• a read-only memory operatively connected with the PLD, the memory hosting:
• two-dimensional pixel representations of digits 0 through 9;
• a fixed image address in the RAM frame buffer for the LCD for displaying time;
• and
• a permanent image address in the RAM frame buffer for the LCD for displaying current,
• wherein the PLD is configured to select, through the series of logic gates, pixel representations from the memory based on values from the timer and write the selected pixel representations starting at the fixed image address in the RAM frame buffer;
• and
• wherein the PLD is configured to look up pixel representations from the memory based on values from the ammeter and write the looked-up pixel representations starting at the permanent image address in the RAM frame buffer.