I haven't encountered the non-response mode using this code. It displays about the same response as what I get transferring directly to an LCD I am grabbing a frame every ~320 ms at the moment. Three seconds is quite long between frames. Using ASCII doubles the amount of bytes needed to be sent so that could be sped up. I have implemented it printing to an LCD and sending in different formats but this transmits ASCII through USB. Footprint-compatibleEdit Single sided with SMD and TH components 5 V and 3.3 V LDO onboard USB to serial PL2303 instead of Atmega16U2 16 MHz crystal. I have been using that but working on implementing USB transmission to speed up the transmission. I was able to transmit a whole frame reliably in HEX or DEC though. If too much is written between frames, the camera can get out of sync. You are also re-initializing SPI in every loop which I think can be done in the setup and may be causing an issue. I've been running my SPI at a faster clock than you because I found it easily will fall out of sync otherwise. It specifies a 185ms wait period between disable/enable of the CS pin. I believe this is your central issue with your frame grabbing code. If you look on page 34 and 35 of the FLIR data brief(could there have been a more poorly written data sheet?) for the camera it will describe how to maintain/fall out of/re-establish sync on the camera. The 'red square' issue I believe is just the camera getting out of sync and then the program just throwing up a red square.

I've been using the Due to transfer frames and do some I2C commanding(the I2C command scheme isn't implemented properly in the github code). There is a native USB port available on the Arduino Due, which is connected to the USB peripheral of the chip.

As this was my first attempt at using embedded code it has been a bit frustrating. Which only makes me think no one tested it. Mostly my issue is that it was written for an arduino that couldn't even buffer a frame. There are numerous issues I have found with it.

Arduino due usb host serial