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Clarify that RP2350 gets its unique id from OTP #1942

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Clarify that RP2350 gets its unique id from OTP #1942

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6f83725
Clarify that RP2350 gets its unique id from OTP
peterharperuk Sep 23, 2024
ed843a0
Wrap rp2040_specific and rp2350_specific bits
peterharperuk Sep 25, 2024
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46 changes: 36 additions & 10 deletions src/rp2_common/pico_unique_id/include/pico/unique_id.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ extern "C" {
*
* \brief Unique device ID access API
*
* \if rp2040_specific
* RP2040 does not have an on-board unique identifier (all instances of RP2040
* silicon are identical and have no persistent state). However, RP2040 boots
* from serial NOR flash devices which have at least a 64-bit unique ID as a standard
Expand All @@ -31,6 +32,11 @@ extern "C" {
*
* This avoids some pitfalls of the hardware_flash API, which requires any
* flash-resident interrupt routines to be disabled when called into.
* \endif
*
* \if rp2350_specific
* On boards using RP2350, the unique identifier is read from OTP memory on boot.
* \endif
*/

#define PICO_UNIQUE_BOARD_ID_SIZE_BYTES 8
Expand All @@ -39,9 +45,18 @@ extern "C" {
* \brief Unique board identifier
* \ingroup pico_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.
* This structure contains an array of PICO_UNIQUE_BOARD_ID_SIZE_BYTES identifier bytes suitable for
* holding the unique identifier for the device.
*
* \if rp2040_specific
* On an RP2040-based board, the unique identifier is retrieved from the external NOR flash device at boot,
* or for PICO_NO_FLASH builds the unique identifier is set to all 0xEE.
* \endif
*
* \if rp2350_specific
* On an RP2350-based board, the unique identifier is retrieved from OTP memory at boot.
* \endif
*
*/
typedef struct {
uint8_t id[PICO_UNIQUE_BOARD_ID_SIZE_BYTES];
Expand All @@ -50,10 +65,16 @@ typedef struct {
/*! \brief Get unique ID
* \ingroup pico_unique_id
*
* Get the unique 64-bit device identifier which was retrieved from the
* external NOR flash device at boot.
* Get the unique 64-bit device identifier.
*
* \if rp2040_specific
* On an RP2040-based board, the unique identifier is retrieved from the external NOR flash device at boot,
* or for PICO_NO_FLASH builds the unique identifier is set to all 0xEE.
* \endif
*
* On PICO_NO_FLASH builds the unique identifier is set to all 0xEE.
* \if rp2350_specific
* On an RP2350-based board, the unique identifier is retrieved from OTP memory at boot.
* \endif
*
* \param id_out a pointer to a pico_unique_board_id_t struct, to which the identifier will be written
*/
Expand All @@ -62,11 +83,16 @@ void pico_get_unique_board_id(pico_unique_board_id_t *id_out);
/*! \brief Get unique ID in string format
* \ingroup pico_unique_id
*
* Get the unique 64-bit device identifier which was retrieved from the
* external NOR flash device at boot, formatted as an ASCII hex string.
* Will always 0-terminate.
* Get the unique 64-bit device identifier formatted as a 0-terminated ASCII hex string.
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Would "null-terminated" be better than "0-terminated" ?

*
* \if rp2040_specific
* On an RP2040-based board, the unique identifier is retrieved from the external NOR flash device at boot,
* or for PICO_NO_FLASH builds the unique identifier is set to all 0xEE.
* \endif
*
* On PICO_NO_FLASH builds the unique identifier is set to all 0xEE.
* \if rp2350_specific
* On an RP2350-based board, the unique identifier is retrieved from OTP memory at boot.
* \endif
*
* \param id_out a pointer to a char buffer of size len, to which the identifier will be written
* \param len the size of id_out. For full serial, len >= 2 * PICO_UNIQUE_BOARD_ID_SIZE_BYTES + 1
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