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Fixing unique id DEVICE_ID3 on STM32L0 and STM32L1 #3083

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Fixing unique id DEVICE_ID3 on STM32L0 and STM32L1 #3083

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13 changes: 12 additions & 1 deletion libraries/USBDevice/inc/usbd_desc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,18 @@
/* Exported constants --------------------------------------------------------*/
#define DEVICE_ID1 (UID_BASE)
#define DEVICE_ID2 (UID_BASE + 0x4U)
#define DEVICE_ID3 (UID_BASE + 0x8U)
/*
* On STM32L0 and STM32L1 the three unique-ID words are NOT contiguous:
* the reference manuals place bits 95:64 at offset 0x14, not 0x08
* (RM0376/RM0377/RM0367/RM0451 "Unique device ID registers (96 bits)",
* and RM0038 for STM32L1). UID_BASE + 0x8U is a reserved location there.
* ST's own HAL_GetUIDw2() already uses 0x14U for these two families.
*/
#if defined(STM32L0xx) || defined(STM32L1xx)
#define DEVICE_ID3 (UID_BASE + 0x14U)
#else
#define DEVICE_ID3 (UID_BASE + 0x8U)
#endif

/*
* USB Billboard Class USER string desc Defines Template
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