STM32 H573 TrustZone Enabled question.
I'm executing the STM32 H573 example for TrustZone Enabled (OEMiROT, Secure, and Non Secure Apps). I know the OEMiROT and Non Secure App prints out and logs info, but I want to be able to do that in the Secure App for logging purposes - errors and debugging. I tried to use Gemini to create code that does that, but there appears to be many security hoops to jump through to do that, and I have been unsuccessful. Do you have an example of what I can do to do this?
Gemini creates the following functions and instructs me to place it under the Non Secure App and call it from a Secure App function, but I keep running into the problem of where I'm getting multiple definition of `NS_putc_utility' error.
/**
* @brief Non-Secure Call-able (NSC) function that returns the pointer
* to the Non-Secure World's _write (UART) function.
*
* The __attribute__ flag ensures the compiler generates the security veneer.
*/
__attribute__((cmse_nonsecure_entry))
int32_t NS_putc_utility(int32_t ch)
{
char buffer[1] = {(char)ch};
// Call the actual low-level _write function.
// The security veneer is wrapped around this function entry.
return _write(1, buffer, 1);
}
