[STM32 NUCLEO] Init MAC address

Author: jeromecoutant

features/net/FEATURE_IPV4/lwip-interface/lwip-eth/arch/TARGET_STM/TARGET_STM32F4/TARGET_UBLOX_C029/stm32f4_eth_init.c

@@ -119,7 +119,7 @@ void HAL_ETH_MspDeInit(ETH_HandleTypeDef* heth)
     }
 }
 
-void mbed_mac_address(char *mac)
+uint8_t mbed_otp_mac_address(char *mac)
 {
     C029_OTP_Header *pFound = NULL;
     C029_OTP_Header *pTemp = (C029_OTP_Header*)C029_OTP_START_ADDRESS;
@@ -140,4 +140,6 @@ void mbed_mac_address(char *mac)
         }
     }
     memcpy(mac, _macAddr, 6);
+
+    return 1;
 }

features/net/FEATURE_IPV4/lwip-interface/lwip-eth/arch/TARGET_STM/stm32xx_emac.c

@@ -431,3 +431,45 @@ void eth_arch_disable_interrupts(void)
 {
     NVIC_DisableIRQ(ETH_IRQn);
 }
+
+/** This returns a unique 6-byte MAC address, based on the device UID
+*  This function overrides hal/common/mbed_interface.c function
+*  @param mac A 6-byte array to write the MAC address
+*/
+
+void mbed_mac_address(char *mac) {
+	if (mbed_otp_mac_address(mac)) {
+		return;
+	} else {
+		mbed_default_mac_address(mac);
+	}
+	return;
+}
+
+__weak uint8_t mbed_otp_mac_address(char *mac) {
+    return 0;
+}
+
+void mbed_default_mac_address(char *mac) {
+    unsigned char ST_mac_addr[3] = {0x00, 0x80, 0xe1}; // default STMicro mac address
+
+    // Read unic id
+#if defined (TARGET_STM32F2)
+    uint32_t word0 = *(uint32_t *)0x1FFF7A10;
+#elif defined (TARGET_STM32F4)
+    uint32_t word0 = *(uint32_t *)0x1FFF7A10;
+#elif defined (TARGET_STM32F7)
+    uint32_t word0 = *(uint32_t *)0x1FF0F420;
+#else
+    #error MAC address can not be derived from target unique Id
+#endif
+
+    mac[0] = ST_mac_addr[0];
+    mac[1] = ST_mac_addr[1];
+    mac[2] = ST_mac_addr[2];
+    mac[3] = (word0 & 0x00ff0000) >> 16;
+    mac[4] = (word0 & 0x0000ff00) >> 8;
+    mac[5] = (word0 & 0x000000ff);
+
+    return;
+}