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Hello,

It seems there is a bug in i2c_slave implementation for Mojo/HDMI Shield. I have used rk3328 box as HDMI source in HDMI pass through scenario. On HDMI source I can see error: "failed to get edid".

Inside i2c_slave.luc there is state transition from READ_ACK_WAIT to WRITE_BYTE. It is good idea to check master's ACK/NACK before going to WRITE_BYTE again. Go to IDLE state if master responds NACK. Currently it goes into WRITE_BYTE anyway and continues to write into bidirectional sda line. Such behavior considered incorrect. For more details see please patch in attachment.

Thanks.

Attached Files

  fix_i2c_slave.txt (Size: 354 bytes / Downloads: 4)

How do I easily convert an io element into an io shield to stack onto the mojo dev board? Many thanks

Hi all, 

I'm new to FPGA's but have a background in PIC/Arduino projects. I would like to grab a mojo board and the HDMI shield and then be able to make modifications to the image "live". 

I imagine I can store the image in a frame buffer and then output that frame rather than processing pixel by pixel in a live fashion. (separating the input and output clocks). Going forward I would like to be able to do things like fade to and from black (or other colour), load in stills into a separate buffer and fade to and from them, And possible scale 1/4 of the screen input to be full output. I realise this is all quite ambitious, but the mojo and HDMI shield look like they would fit the bill for learning how to do these things? 

Anyone got any tips, advice or suggestions or support they would like to share with me? 

Thanks, 
Matt

So I have a question that applies to both the Mojo V3 and the Au boards.

I know that both can be powered through the RAW voltage pins mixed in with the I/O pins. My question is, is it safe to plug in USB for programming while the board is being powered this way? Can these boards be programmed "in circuit" without damaging the board or the computer? Do I need to remove them from the project before programming?

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Hello all, 
I noticed the was not a convenient list of what physical pins of the Cu board connects to what header on the Br board. So I figured it out and am going to post the .pcf file here. I also have a template for icestorm builds using that pcf. I was wondering if I should submit a pull request and to which projects if any. Would anybody be interested? Also, did I duplicate work by accident?

Attached Files

  pins.txt (Size: 1.68 KB / Downloads: 19)

Hi, I am just learning about FPGA and programming it and don't know much about it.
I was wondering if Alchitry Labs and the Lucid IDE can be used to program other boards that have a different usecase but posses the Xilinx chip, like the ettus USRP?

Hi all,

In my FPGA adventures, I quickly stumbled onto the "FPGA Hell", so now I am looking how to debug the signals going through the Alchitry boards.

Which tool do you prefer and why?

1. Alchitry wave capture
   
   
   
2. Wishbone controlled scope to capture vcd and show in gtkwave, setup described in this article
   
   
   
3. Vivado debugging Integrated Logic Analyzer ILA
   
   
   
4. Litescope, wich can also export to sigrok
   
   
5. Your own debug statements sent over uart