USB dynamic serial number

In this use case, the USB serial strings is dynamic. For a static serial string refer to Use USB strings.

Setup steps

Prior to implement this use case, be sure to have already apply the UDI module "basic use case".

Usage steps

Example code

Content of conf_usb.h:

#define  USB_DEVICE_SERIAL_NAME
#define  USB_DEVICE_GET_SERIAL_NAME_POINTER serial_number
#define  USB_DEVICE_GET_SERIAL_NAME_LENGTH  12
extern uint8_t serial_number[];

Add to application C-file:

uint8_t serial_number[USB_DEVICE_GET_SERIAL_NAME_LENGTH];

void init_build_usb_serial_number(void)
{
serial_number[0] = 'A';
serial_number[1] = 'B';
...
serial_number[USB_DEVICE_GET_SERIAL_NAME_LENGTH-1] = 'C';
} 

Workflow

1. Ensure that conf_usb.h is available and contains the following parameters required to enable a USB serial number strings dynamically:

   • #define  USB_DEVICE_SERIAL_NAME // Define this empty
            #define  USB_DEVICE_GET_SERIAL_NAME_POINTER serial_number // Give serial array pointer
            #define  USB_DEVICE_GET_SERIAL_NAME_LENGTH  12 // Give size of serial array
            extern uint8_t serial_number[]; // Declare external serial array 

2. Before start USB stack, initialize the serial array

   • uint8_t serial_number[USB_DEVICE_GET_SERIAL_NAME_LENGTH];
     
     void init_build_usb_serial_number(void)
     {
     serial_number[0] = 'A';
     serial_number[1] = 'B';
     ...
     serial_number[USB_DEVICE_GET_SERIAL_NAME_LENGTH-1] = 'C';
     }