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esp32s2: Use the device's EUI-48 address as unique ID #3156

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Merged
merged 1 commit into from
Jul 16, 2020
Merged

esp32s2: Use the device's EUI-48 address as unique ID #3156

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22 changes: 22 additions & 0 deletions ports/esp32s2/common-hal/microcontroller/Processor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,10 +26,14 @@
*/

#include <math.h>
#include <string.h>

#include "common-hal/microcontroller/Processor.h"
#include "py/runtime.h"
#include "supervisor/shared/translate.h"

#include "soc/efuse_reg.h"

float common_hal_mcu_processor_get_temperature(void) {
return NAN;
}
Expand All @@ -42,5 +46,23 @@ uint32_t common_hal_mcu_processor_get_frequency(void) {
return 0;
}

STATIC uint8_t swap_nibbles(uint8_t v) {
return ((v << 4) | (v >> 4)) & 0xff;
}

void common_hal_mcu_processor_get_uid(uint8_t raw_id[]) {
memset(raw_id, 0, COMMON_HAL_MCU_PROCESSOR_UID_LENGTH);

uint8_t *ptr = &raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH-1];
// MAC address contains 48 bits (6 bytes), 32 in the low order word
uint32_t mac_address_part = REG_READ(EFUSE_RD_MAC_SPI_SYS_0_REG);
*ptr-- = swap_nibbles(mac_address_part & 0xff); mac_address_part >>= 8;
*ptr-- = swap_nibbles(mac_address_part & 0xff); mac_address_part >>= 8;
*ptr-- = swap_nibbles(mac_address_part & 0xff); mac_address_part >>= 8;
*ptr-- = swap_nibbles(mac_address_part & 0xff);

// and 16 in the high order word
mac_address_part = REG_READ(EFUSE_RD_MAC_SPI_SYS_1_REG);
*ptr-- = swap_nibbles(mac_address_part & 0xff); mac_address_part >>= 8;
*ptr-- = swap_nibbles(mac_address_part & 0xff);
}
2 changes: 1 addition & 1 deletion ports/esp32s2/common-hal/microcontroller/Processor.h
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Expand Up @@ -27,7 +27,7 @@
#ifndef MICROPY_INCLUDED_LITEX_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
#define MICROPY_INCLUDED_LITEX_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H

#define COMMON_HAL_MCU_PROCESSOR_UID_LENGTH 15
#define COMMON_HAL_MCU_PROCESSOR_UID_LENGTH 6

#include "py/obj.h"

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2 changes: 1 addition & 1 deletion ports/esp32s2/mpconfigport.mk
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Expand Up @@ -7,7 +7,7 @@ MPY_TOOL_LONGINT_IMPL = -mlongint-impl=mpz
INTERNAL_LIBM = 1

# Chip supplied serial number, in bytes
USB_SERIAL_NUMBER_LENGTH = 30
USB_SERIAL_NUMBER_LENGTH = 12

# Longints can be implemented as mpz, as longlong, or not
LONGINT_IMPL = MPZ
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