To understand your Open4 tool's capabilities and organization, there is user documentation in the "Resources" section of this site. The documentation has two principle documents the Open4 base user manual (information specific to the Open4 and EvoPrimer bases) and the STM8L user manual (information specific to the target board and the target MCU).
>Question: There is a built-in STM32 on the primer to manage the system. Is that STM32 >wired to all the primer HW resources? (joystick, SDCard, LCD, IrDa...)
>How the STM8 access the resources without conflict?
The STM32 on the base is only the debug/programming interface (RLink) for the target STM8... it is not connected directly to the features of the base. The target MCU drives the features on the base.
>Can the STM8 talk to the STM32 to perform some of the code size hungry tasks (SD Card, >Emulate LCD as character (non dot matrix) display without the need to define the font?)
The STM8 (target MCU) and the STM32 (RLink debug interface) do not work together to use or manage the features on the base.
>What type of HW link between the two? Only SWIM?
The base and target board are wired to provide SWIM interface connection to STM8 targets and SWD interface connection to STM32 targets.
>Can uSD, irda or even RS232 via USB be implemented on STM8 through the help of STM32?
No, as described above, the STM32 on the base only serves for debug and programming connection to the target STM8 (or STM32). That is to say the MCU mounted on a compatible target board.
>It's quite hard to find out how the system works... at hardware level.
All board electrical schematics and two user manuals (Base and Target Board) are provided in the resources section of this site.
Don't hesistate to pose questions via the forum.
