Lepton 3.5 Not Sending Frames

[ddwa...@gmail.com]

Hi Guys

  I really need help on this one.  I have a hardware SPI/VoSPI Lepton interface communicating with a Lepton 3.5 camera, SPI running a 12MHz and I can not for the life of me get the lepton to send a full frame, moreover it won't send a full segment, I'm getting discard packets within a segment causing me to abort and resync the Lepton.  

   I have NO IDEA why this is happening, I know my interface is operating properly but perhaps there is something I do not understand about the protocol.  

1. Should I expect to see discard packets in the middle of a segment?  If so how should I handle this?

2. Sometimes it seems the lepton starts sending packets out of order causing the hardware interface to resync, is this normal, how should I handle it?

3. Even more strange after a resync sometimes the lepton sends packet headers which are all zeros, or perhaps these aren't headers at all perhaps they are something else.  Any ideas on what is going on?

[Aiara Brea Portals]

Hi!

I have the same problem with Lepton 3.1R and SPI communication. The sensor seems to initialize correctly, but the data packets always have invalid values like 0F FF FF FF. I only need obtain RAW data from the sensor.

Details of the issue:

• Sensor initialization: The inicialization seems to initialize correctly. It responds well when I try to obtain the part number and other parameters.
• SPI pins: I've verified many times that the SCK, MISO and CS pins are correctly connected. I even tried using different cameras and breakout boards.
• SPI configuration: I'm using spi_device_transmit, but the data received is incorrect.
• Packet reception: The received packets always have the same invalid values and sometimes I get packets with values like FF 00 00 00.

What I've tried:

• I've checked the SPI pin configuration, packet length, I2C configuration, and other parameters.
• I've adjusted the SPI frecuency and tried different configuration.
• I've been following the firmwares from Dan Julio for ESP32, but I can't find any solution for this issue. I think the configuration is the same, but I haven't been able to resolve it.

My environment:

• Platform: ESP32 Arduino Nano (ESP32-S3)
• Framework: ESP-IDF
• Lepton version: Lepton 3.1R

If anyone has solutions for this problem or suggestions to help resolve it, I would really appreciate.

Thank you!!