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read SAM3S unique serial number at start and print it

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This commit is contained in:
Harald Welte
2016-03-20 16:00:39 +01:00
parent 28772ebcdc
commit 8ee15dbc2a
5 changed files with 56 additions and 1 deletions
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43
firmware/src_sam3s/unique_id.c Normal file
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#include "chip.h"
#define EFC_FCMD_STUI 0x0E
#define EFC_FCMD_SPUI 0x0F
__attribute__ ((section(".ramfunc")))
void EEFC_ReadUniqueID(unsigned int *pdwUniqueID)
{
unsigned int status;
/* Errata / Workaround: Set bit 16 of EEFC Flash Mode Register
* to 1 */
EFC->EEFC_FMR |= (1 << 16);
/* Send the Start Read unique Identifier command (STUI) by
* writing the Flash Command Register with the STUI command. */
EFC->EEFC_FCR = (0x5A << 24) | EFC_FCMD_STUI;
/* Wait for the FRDY bit to fall */
do {
status = EFC->EEFC_FSR;
} while ((status & EEFC_FSR_FRDY) == EEFC_FSR_FRDY);
/* The Unique Identifier is located in the first 128 bits of the
* Flash memory mapping. So, at the address 0x400000-0x400003.
* */
pdwUniqueID[0] = *(uint32_t *) IFLASH_ADDR;
pdwUniqueID[1] = *(uint32_t *) (IFLASH_ADDR + 4);
pdwUniqueID[2] = *(uint32_t *) (IFLASH_ADDR + 8);
pdwUniqueID[3] = *(uint32_t *) (IFLASH_ADDR + 12);
/* To stop the Unique Identifier mode, the user needs to send
* the Stop Read unique Identifier command (SPUI) by writing the
* Flash Command Register with the SPUI command. */
EFC->EEFC_FCR = (0x5A << 24) | EFC_FCMD_SPUI;
/* When the Stop read Unique Unique Identifier command (SPUI)
* has been performed, the FRDY bit in the Flash Programming
* Status Register (EEFC_FSR) rises. */
do {
status = EFC->EEFC_FSR;
} while ((status & EEFC_FSR_FRDY) != EEFC_FSR_FRDY);
}