Ok, so here are the basic components of this Graupner MZ-32 R/C Transmitter, which was released around first quarter of 2018.
Main components list:
STM32F4229Z -> ST Micro STM32F29, LQFP-144 pin package (ARM Core). The 32F29 has the built-in LCD-TFT controller, which is what they are using as their processor to drive the touch screen, graphics, etc.
STM32F405 ->ST Micro STM32F405, LQFP-64 pin package (ARM Core). The 32F405 is part of their ST32 family, which is what they are using as their main RF processor, handing all the actual Tx/Rx processing.
ISSI IS42S16400J -> Integrated Silicon Solutions IS42S16400, 8MB (64 Mbits) SDRAM, external 8MB memory added on for the Processor 1, LCD processor.
28EW256ABA -> Micron NOR Flash, 32MB (256 Mbits) 56-pin TSOP. This flash provides an external 32MB to the main lcd processor (processor 1).
AMPIRE 480272HG-T32 -> Ampire 480x272 RGB LCD screen with capactive touch, parallel interface. This is the main Tx LCD interface with touch.
ESP-12S -> RF Solutions 2.4Ghz wifi module. This is the wifi SOC module that provides the 2.4Ghz wifi capability for this Tx.
W32i-A -> Silicon Labs Bluetooth SOC module. This unit provides the bluetooth capability for this Tx.
VLSI VS1011E -> VLSI Solutions MP3 SOC Module. This unit provides the mp3 decoding capability for this Tx.
(The 8MB SDRAM is mainly used for the LCD Frame Buffer needed for the STM32F429, as there is no internal ram available on these STM processors big enough for an LCD frame buffer. )
** Just to re-iterate, this Tx design is top-notch, and was well thought out and engineered to very high standards, and not cutting any corners to save costs.
The Dual-processor design gives them so much capability to keep RF comms and GUI/User operational tasks in separate domains.
There is plenty of room for the future in this design, as they have plenty of flash space in both STM32 processors, as well as the external 32MB flash for the main processor. Also, they may have even more external SDRAM available for the main processor, depending on how much of the 8MB SDRAM they are using for the frame buffer (or buffers).