A TFT backlight can be dimmed by an MCU timer or by the display controller’s own PWM, set with the MIPI DCS brightness commands. What each option costs, what it frees up, and the traps when you move from one to the other.
How FlexSPI talks to a QSPI NOR on the i.MX RT1062: the two access paths, the LUT, the sampling clock that caps your frequency, and how to prove you run at full speed. Read speed is checked against the bus, write speed against the flash datasheet.
What each IOMUXC pad-control field on the i.MX RT10xx actually does, how to derive its value from the schematic and the protocol spec instead of trusting generated defaults, and a microSD interface as a worked example.
GPIO, ADC and FlexPWM interrupts follow one NVIC pattern but differ in where the trigger lives and how the flag clears. Plus the audit that matters with FreeRTOS: which ISRs sit above the syscall barrier, and therefore must never touch a FreeRTOS API.
What it takes in firmware to run a daisy chain of devices over Single Pair Ethernet: which port decides that the controller is gone, how a node learns its position, when to store the topology, why the receive interrupt lies, and how to update every device on the chain.