SD4DPGenIO Firmware: General I/O Control for the SD4DP Series
SD4DP with MTA-100 connectors
The SD4DPGenIO firmware converts any of our SD4DP series of boards into a generic TTL I/O controller, suitable for control and monitoring of up to 15 TTL level I/O signals plus 8 additional higher-current outputs (usually used to drive relays).
This firmware supports the following I/O ports:
- 15 generic TTL I/O lines with user control of signal direction (input or output)
- 8 high current (up to 200 mA each, if the power is available) outputs (using one ULN2803 driver), for all boards except the original SD4D unit. The original SD4D simply has 8 extra TTL output lines instead.
- 2 programmable 0 to 5 volt 8 bit DAC outputs
- USB communications, using virtual COM port (so it 'feels' like RS232 serial when programming)
- TTL-Serial communications from any PIC micro that handles TTL-Serial
The above I/O ports may be utilized by the firmware to support the following features (not all combinations work at the same time, they are limited by whether a given port is configured as an input or an output):
- Reading up to 7 encoders (each is separately maintained as a 32 bit location)
- Up to four separate pulse generators may be operated concurrently, each operating any combination of the TTL or high-current output ports
- Complete bit-level output level control for all output ports
- Simple TTL input monitoring of all input ports
- Capability of 'waiting' for an edge event on any combination of input ports
- Independent control of the two 0 to 5 volt 8 bit DAC output signals
- SPI output support allows for generic control of multiple external SPI compatible devices.
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