jrrk

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About jrrk

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  1. The SPI header has a number of uses, the main useful one for the end user is being able to switch between SPP/DUN/HID mode (one at a time with one peer), and all-powerful HCI mode which supports any profile and up to seven slaves. Obviously with some pathetic Arduino attached the SPP might be more suitable, but with an FPGA running a Linux softcore, what's not to like about the scary HCI mode ? More information (for experts only) is available at https://github.com/lorf/csr-spi-ftdi
  2. I purchased a PMOD-BT2 recently and since (according to your documentation) the SPI connector uses the same power as the regular PMOD connector, I though I could just connect it via the SPI header (not supplied), for programming. Strangely enough, the FPGA board (a Nexys4-DDR) would not power up. An investigation reveals a strange fact: according to an ohm-meter the power on the SPI header is reversed compared to your documentation. I would appreciate it if someone from Digilent could confirm this from the PCB schematics and update your documentation ASAP, as well as issue an errata, because connecting the power the wrong way round has a habit of blowing things up.
  3. Judging from the circuit diagram, the correct pinout in Figure 13 should be V20, T20, T21, W20, W19, U18, V19, T18.
  4. The SD-card pinout for the Nexys-Video in the reference manual is copied from Nexys-DDR and is incorrect. It is impossible to complete vivado with the incorrect information because one of the incorrect pins is now a ground.