add mac address offset for some esp32s2.
@@ -164,7 +164,20 @@ esp_err_t esp_read_mac(uint8_t* mac, esp_mac_type_t type)
case ESP_MAC_WIFI_SOFTAP:
#if CONFIG_ESP_MAC_ADDR_UNIVERSE_WIFI_AP
memcpy(mac, efuse_mac, 6);
+ // as a result of some esp32s2 chips burned with one MAC address by mistake,
+ // there are some MAC address are reserved for this bug fix.
+ // related mistake MAC address is 0x7cdfa1003000~0x7cdfa1005fff,
+ // reserved MAC address is 0x7cdfa1020000~0x7cdfa1022fff (MAC address + 0x1d000).
+#ifdef CONFIG_IDF_TARGET_ESP32S2
+ uint8_t mac_begin[6] = { 0x7c, 0xdf, 0xa1, 0x00, 0x30, 0x00 };
+ uint8_t mac_end[6] = { 0x7c, 0xdf, 0xa1, 0x00, 0x5f, 0xff };
+ if(memcmp(mac,mac_begin,6) >= 0 && memcmp(mac_end,mac,6) >=0 ){
+ mac[3] += 0x02; // contain carry bit
+ mac[4] += 0xd0;
+ }
+#else
mac[5] += 1;
+#endif // IDF_TARGET_ESP32S2
#else
esp_derive_local_mac(mac, efuse_mac);
#endif
