When deploying a custom built model to replace the default models in MCUXpresso SDK examples, there are several modifications that need to be made as described in the eIQ Neutron NPU hands-on labs.
Here are some common issues and error messages that you might encounter when using a new custom model with the SDK examples and how to solve them. If there is an issue not covered here, then please make a new thread to discuss that issue.
“Didn't find op for builtin opcode ‘<operator_name>’”
- Need to add that operator to MODEL_GetOpsResolver function found in source\model\model_name_ops_npu.cpp
- A full list of operators used by a model that can be copy-and-pasted into that file is automatically generated by Neutron Converter Tool with the dump-header-file option.
- Make sure to also increase the size of the static array s_microOpResolver to match the number of operators
“resolver size is too small”
- Need to increase the size of the static array s_microOpResolver in MODEL_GetOpsResolver function found in source\model\model_name_ops_npu.cpp to match the number of operators
“Failed to resize buffer”
- The scratch memory buffer is too small for the model and needs to be increased.
- The size of the memory buffer is set with the kTensorArenaSize variable found in the model data header file
“Incompatible Neutron NPU microcode and driver versions!”
- Ensure the version of the eIQ Neutron Converter Tool used to convert the model is the correct one that is compatible with the NPU libraries used by the SDK project.
- eIQ Toolkit v1.10.0 should be used with MCXUpresso SDK for MCX N 2.14.0. The Neutron Converter Tool version is 1.2.0+0X84d37e1f
Camera colors are incorrect on FRDM-MCXN947 board
- Modify solder jumpers SJ16, SJ26, and SJ27 on the back of board to move them to the left (dashed line side) to connect camera signals properly.
- This modification will disable Ethernet functionality on the board due to a signal conflict with EZH D0 and ENET_TXCLK. If your project needs both camera and Ethernet functionality, then only move SJ16 and SJ26 to the left (dashed line side) and then connect a wire from P1_4 (J9 pin
to the left side of R58. Then in the pin_mux.c file in the project, instead of using PORT1_PCR4 for EZH_Camera_D0, use PORT3_PCR0.
