请问USB Get_SerialNum函数意义是什么

tjusyj · 发表于 2015-1-5 12:31:08

[mw_shl_code=c,true] [/mw_shl_code] [mw_shl_code=c,true] [/mw_shl_code] [mw_shl_code=c,true]/******************************************************************************* * Function Name : Get_SerialNum. * ?????è±??ò??????×?±???unicode×?·??® * Description : Create the serial number string descriptor. * Input : None. * Output : None. * Return : None. *******************************************************************************/ void Get_SerialNum(void) { u32 Device_Serial0, Device_Serial1, Device_Serial2; Device_Serial0 = *(u32*)(0x1FFFF7E8); Device_Serial1 = *(u32*)(0x1FFFF7EC); Device_Serial2 = *(u32*)(0x1FFFF7F0); if (Device_Serial0 != 0) { Joystick_StringSerial[2] = (u8)(Device_Serial0 & 0x000000FF); Joystick_StringSerial[4] = (u8)((Device_Serial0 & 0x0000FF00) >> 8); Joystick_StringSerial[6] = (u8)((Device_Serial0 & 0x00FF0000) >> 16); Joystick_StringSerial[8] = (u8)((Device_Serial0 & 0xFF000000) >> 24); Joystick_StringSerial[10] = (u8)(Device_Serial1 & 0x000000FF); Joystick_StringSerial[12] = (u8)((Device_Serial1 & 0x0000FF00) >> 8); Joystick_StringSerial[14] = (u8)((Device_Serial1 & 0x00FF0000) >> 16); Joystick_StringSerial[16] = (u8)((Device_Serial1 & 0xFF000000) >> 24); Joystick_StringSerial[18] = (u8)(Device_Serial2 & 0x000000FF); Joystick_StringSerial[20] = (u8)((Device_Serial2 & 0x0000FF00) >> 8); Joystick_StringSerial[22] = (u8)((Device_Serial2 & 0x00FF0000) >> 16); Joystick_StringSerial[24] = (u8)((Device_Serial2 & 0xFF000000) >> 24); } }[/mw_shl_code]

注释该函数后看到serialnumber是所定义的STM3210

iSerialNumber: 0x03
0x0409: "STM3210"

但是Get_SerialNum这个函数意义是什么

函数中得到的derialnumber

Device_Serial0 = *(u32*)(0x1FFFF7E8);

是哪里来的

0x1FFFF7E8这个地址对应的是什么地方呢？