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stm32u0: implement board_get_unique_id from UID_BASE

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Previously stm32u0 had no board_get_unique_id(), so it fell back to the
weak default in hw/bsp/board.c and every board reported the placeholder
USB serial 0123456789ABCDEF. HIL identifies boards by USB serial, so a
non-unique serial collides on a multi-board rig. Read the 96-bit unique
ID from UID_BASE, mirroring stm32u5. Verified on stm32u083nucleo: now
enumerates as 300044000D5036394E373620.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
hathach
2026-06-08 14:34:47 +07:00
parent 7c68545ab6
commit 97480bad2c
1 changed files with 13 additions and 0 deletions
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13
hw/bsp/stm32u0/family.c
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@ -166,6 +166,19 @@ uint32_t board_button_read(void) {
return BUTTON_STATE_ACTIVE == HAL_GPIO_ReadPin(BUTTON_PORT, BUTTON_PIN);
}
size_t board_get_unique_id(uint8_t id[], size_t max_len) {
(void) max_len;
volatile uint32_t *stm32_uuid = (volatile uint32_t *) UID_BASE;
uint32_t *id32 = (uint32_t *) (uintptr_t) id;
uint8_t const len = 12;
id32[0] = stm32_uuid[0];
id32[1] = stm32_uuid[1];
id32[2] = stm32_uuid[2];
return len;
}
int board_uart_read(uint8_t* buf, int len) {
#ifdef UART_ID
int count = 0;