I am in the process of installing a manual control panel on my router, using a MESA 7i73 pendent card. The panel has a 5x6 button matrix and 16 LED indicators. I am driving the LED indicators with a pair of 74HC573 8-bit latch. I had initially planned on wiring each buffer input to a corresponding output on the MESA 7i73 . However, after mapping out the keys, I discovered that this is not possible becuase the 23 keys on my panel are arranged in a 5x6 matrix, which requires that I configure the MESA 7i73 for an 8x8 keypad. This leaves me with 14 outputs total; 2 short.
One option that I think I have is to connect the inputs of both latch chips to the same 8 outputs and use the latch enable on each chip. I have no idea how I would implement a latching buffer scheme in the LinuxCNC HAL. Can anyone help me with that? I am using the 74HC573 devices because I have them on hand. Would it be simpler to use a 74HC154 demultiplexer instead? Thaddeus Waldner _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
