This week I helped in choosing MIDI keyboard for the BOM and continued working on bringup for the FPGA.
We finalized on choosing the MIDI keyboard here : https://www.amazon.com/Alesis-VI25-Controller-Assignable-Production/dp/B00IWVL3SW. This features both a MIDI output as well as the after touch keys and velocity sensitive pads.
Additionally I took last week’s SDRAM tests and started integrating/stripping it down so that we can use the controller independently from the rest of the Altera test files. This is still in progress.
I finished testing writes to the GPIO pins on the FPGA to make sure that we can properly observe the required voltage changes. Below are the results.
Tested using power supplied by laptop (usb)
- GPIO 0
- VCC5 = 4.632 V
- VCC3P3 = 3.327 V
- undriven pin = 0.53 – 0.61 V
- drive 0 to [34] = 0.205 mV
- drive 1 to [34] = 3.326 V
- drive 0 to [35] = 0.210 mV
- drive 1 to [35] = 3.326 V
- GPIO 1
- VCC5 = 4.633 V
- VCC3P3 = 3.327 V
- undriven pin = 1.0 – 1.1 V
- drive 0 to [3] = 0.288 mV
- drive 1 to [3] = 3.326 V
- drive 0 to [5] = 0.274 mV
- drive 1 to [5] = 3.326 V
For the next week I will begin researching more into the Panning effect as well as start writing a simple testbench so we can begin writing verilog for each of the DSP blocks.