What are the versions of STUSB4500?

[JulienD]

Hello,

While having a look at NVM flashing example, I came across those lines:

I2C_Read_USB_PD(0,DEVICE_ID,&Buffer,1); 
// DEV_CUT 0 : 1600 , 1 Reserved , 2 : 1602 , 3 Autorun 
 
if(Buffer & ID_Reg >= CUT) 
{
 if ( nvm_flash(0) == 1)  
 printf("STUSB Flashing Failed \r\n"); // Port 0 mean I2C1 For I2C2 change to Port 1
 else printf("STUSB Flashing Done\r\n");
 }
 else printf("STUSB Flashing Not done : Bad version\r\n");

With my STUSB4500QTR the returned deviceID is 0x25. (On the chip 4500 / M24605 is written).

With this code, everything works (flash and read) but I need explanations for this line :

if(Buffer & ID_Reg >= CUT) 
 

As ID_Reg and CUT are constants, I supposed that this line should more be something

like this:

if ((Buffer & ID_Reg) >= CUT) 
 

But with this code, flash does not occur anymore.

The comment on line 2 in first snippet does not help a lot.

Please can you provide some information on the meanings vs capabilities of productId

and the mean of this line of code?

Thanks

Julien

 NVM flash what does "if ((Buffer & ID_Reg) >= CUT)" mean?

on my road on using STUSB4500