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Add pico_unique_board_id_t struct and rename some functions/defines

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This commit is contained in:
Luke Wren 2021-01-27 14:04:14 +00:00 committed by Graham Sanderson
parent 35f193386b
commit a33e620424
2 changed files with 22 additions and 11 deletions
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18
src/rp2_common/pico_unique_id/include/pico/unique_id.h
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@ -31,7 +31,19 @@ extern "C" {
* flash-resident interrupt routines to be disabled when called into.
*/
#define PICO_UNIQUE_ID_SIZE_BYTES 8
#define PICO_UNIQUE_BOARD_ID_SIZE_BYTES 8
/**
* \brief Unique board identifier
* \ingroup unique_id
*
* This struct is suitable for holding the unique identifier of a NOR flash
* device on an RP2040-based board. It contains an array of
* PICO_UNIQUE_BOARD_ID_SIZE_BYTES identifier bytes.
*/
typedef struct {
uint8_t id[PICO_UNIQUE_BOARD_ID_SIZE_BYTES];
} pico_unique_board_id_t;
/*! \brief Get unique ID
* \ingroup unique_id
@ -42,9 +54,9 @@ extern "C" {
*
* On PICO_NO_FLASH builds the unique identifier is set to all 0xEE.
*
* \param id_out an 8-byte buffer to which the identifer will be written.
* \param id_out a pointer to a pico_unique_board_id_t struct, to which the identifier will be written
*/
void pico_get_unique_id(uint8_t *id_out);
void pico_get_unique_board_id(pico_unique_board_id_t *id_out);
#ifdef __cplusplus
}

15
src/rp2_common/pico_unique_id/unique_id.c
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@ -7,23 +7,22 @@
#include "hardware/flash.h"
#include "pico/unique_id.h"
static_assert(PICO_UNIQUE_ID_SIZE_BYTES == FLASH_UNIQUE_ID_SIZE_BYTES);
static_assert(PICO_UNIQUE_BOARD_ID_SIZE_BYTES == FLASH_UNIQUE_ID_SIZE_BYTES);
static uint8_t retrieved_id[PICO_UNIQUE_ID_SIZE_BYTES];
static pico_unique_board_id_t retrieved_id;
static void __attribute__((constructor)) _retrieve_unique_id_on_boot() {
#if PICO_NO_FLASH
// The hardware_flash call will panic() if called directly on a NO_FLASH
// build. Since this constructor is pre-main it would be annoying to
// debug, so just produce something well-defined and obviously wrong.
for (int i = 0; i < PICO_UNIQUE_ID_SIZE_BYTES; i++)
retrieved_id[i] = 0xee;
for (int i = 0; i < PICO_UNIQUE_BOARD_ID_SIZE_BYTES; i++)
retrieved_id.id[i] = 0xee;
#else
flash_get_unique_id(retrieved_id);
flash_get_unique_id(retrieved_id.id);
#endif
}
void pico_get_unique_id(uint8_t *id_out) {
for (int i = 0; i < PICO_UNIQUE_ID_SIZE_BYTES; i++)
id_out[i] = retrieved_id[i];
void pico_get_unique_board_id(pico_unique_board_id_t *id_out) {
*id_out = retrieved_id;
}