A Wishbone Controller for a PMod-MIC
Digilent makes a MEMs microphone that can be connected to one of their FPGA boards via a peripheral module (PMod) interface standard. The purpose of this project is to provide a set of open source cores that create a wishbone interface to this device.
Thie project provides two separate interfaces are offered in this project: The first one buffers its data into a FIFO, allowing a relaxed reading structure. The second, provides a single sample wishbone capability. Both cores make it possible to:
- Turn the ADC on and off
- Read single samples on command
- Read from the ADC at a programmable rate.
Further, there is a very simple interface core which can be used to get non-wishbone access to this data, should your application not require a wishbone interface.
Several other Digilent PMod ADC devices use the same SPI based interface, so the utility of this core extends well beyond that of the PModMIC3 alone.
Status
The wbmic cores has currently passed its bench test. Neither core has been used within an FPGA (yet). Further, the specification for this core has yet to be written as well, leaving the only specification for how things work the actual code itself.
License
Gisselquist Technology is pleased to offer these cores to all who are interested, subject to the GPLv3 license.
Commercial Opportunities
If the GPLv3 license is insufficient for your needs, other licenses may be purchased from Gisselquist Technology, LLC.