fix: align MAC address api with Arduino reference

References:
https://www.arduino.cc/reference/en/libraries/ethernet/ethernet.macaddress/
https://www.arduino.cc/reference/en/libraries/ethernet/ethernet.setmacaddress/

Pay attention that setMACAddress have to be called before Begin().
Else new MAC will be ignored.

Fixes #81



Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

README.md

@@ -29,7 +29,7 @@ extend the default one by adding some extra configuration in a file named `lwipo
 
 ## New alternative init procedure **!!!**
 
-There are alternative inits of the Ethernetinterface with following orders:
+There are alternative inits of the Ethernet interface with following orders:
 
 	Ethernet.begin();
 	Ethernet.begin(ip);
@@ -39,16 +39,16 @@ There are alternative inits of the Ethernetinterface with following orders:
 
 This is more logical. A MAC address is no more needed and will retrieved internally by the mbed MAC address!
 
-You can get the MAC address with following function, this must done after Ethernet.Begin()
+You can get the MAC address with following function, this must be done after Ethernet.Begin()
 
 	uint8_t *mac;
 	Ethernet.begin();
-	mac = Ethernet.MACAddress();
+	Ethernet.MACAddress(mac);
 
-You can also set a new user based MAC address, this must done before Ethernet.begin()
+You can also set a new user based MAC address, this must be done before Ethernet.begin()
 
 	uint8_t newMAC[] = {0x00, 0x80, 0xE1, 0x01, 0x01, 0x01};
-	Ethernet.MACAddress(newMAC);
+	Ethernet.setMACAddress(newMAC);
 	Ethernet.begin();
 
 ## Note

keywords.txt

@@ -38,9 +38,11 @@ localPort	KEYWORD2
 maintain	KEYWORD2
 linkStatus	KEYWORD2
 MACAddress	KEYWORD2
+setMACAddress	KEYWORD2
 subnetMask	KEYWORD2
 gatewayIP	KEYWORD2
 dnsServerIP	KEYWORD2
+setDnsServerIP	KEYWORD2
 setConnectionTimeout	KEYWORD2
 
 #######################################

src/Dhcp.cpp

@@ -16,8 +16,12 @@ int DhcpClass::beginWithDHCP(uint8_t *mac, unsigned long timeout, unsigned long
   // zero out _dhcpMacAddr
   memset(_dhcpMacAddr, 0, 6);
   reset_DHCP_lease();
-
-  memcpy((void *)_dhcpMacAddr, (void *)mac, 6);
+  if (mac == NULL) {
+    // use mac from Ethernet chip
+    stm32_eth_get_macaddr(_dhcpMacAddr);
+  } else {
+    memcpy((void *)_dhcpMacAddr, (void *)mac, 6);
+  }
   _dhcp_state = STATE_DHCP_START;
   stm32_set_DHCP_state(_dhcp_state);
   return request_DHCP_lease();

src/STM32Ethernet.cpp

@@ -8,7 +8,7 @@ int EthernetClass::begin(unsigned long timeout, unsigned long responseTimeout)
   stm32_eth_init(NULL, NULL, NULL, NULL);
 
   // Now try to get our config info from a DHCP server
-  int ret = _dhcp->beginWithDHCP(mac_address, timeout, responseTimeout);
+  int ret = _dhcp->beginWithDHCP(NULL, timeout, responseTimeout);
   if (ret == 1) {
     _dnsServerAddress = _dhcp->getDnsServerIp();
   }
@@ -58,7 +58,6 @@ int EthernetClass::begin(uint8_t *mac_address, unsigned long timeout, unsigned l
   if (ret == 1) {
     _dnsServerAddress = _dhcp->getDnsServerIp();
   }
-  MACAddress(mac_address);
   return ret;
 }
 
@@ -86,14 +85,13 @@ void EthernetClass::begin(uint8_t *mac_address, IPAddress local_ip, IPAddress dn
   begin(mac_address, local_ip, dns_server, gateway, subnet);
 }
 
-void EthernetClass::begin(uint8_t *mac, IPAddress local_ip, IPAddress dns_server, IPAddress gateway, IPAddress subnet)
+void EthernetClass::begin(uint8_t *mac_address, IPAddress local_ip, IPAddress dns_server, IPAddress gateway, IPAddress subnet)
 {
-  stm32_eth_init(mac, local_ip.raw_address(), gateway.raw_address(), subnet.raw_address());
+  stm32_eth_init(mac_address, local_ip.raw_address(), gateway.raw_address(), subnet.raw_address());
   /* If there is a local DHCP informs it of our manual IP configuration to
   prevent IP conflict */
   stm32_DHCP_manual_config();
   _dnsServerAddress = dns_server;
-  MACAddress(mac);
 }
 
 EthernetLinkStatus EthernetClass::linkStatus()
@@ -133,19 +131,14 @@ void EthernetClass::schedule(void)
   stm32_eth_scheduler();
 }
 
-void EthernetClass::MACAddress(uint8_t *mac)
+void EthernetClass::setMACAddress(const uint8_t *mac_address)
 {
-  mac_address[0] = mac[0];
-  mac_address[1] = mac[1];
-  mac_address[2] = mac[2];
-  mac_address[3] = mac[3];
-  mac_address[4] = mac[4];
-  mac_address[5] = mac[5];
+  stm32_eth_set_macaddr(mac_address);
 }
 
-uint8_t *EthernetClass::MACAddress(void)
+void EthernetClass::MACAddress(uint8_t *mac_address)
 {
-  return mac_address;
+  stm32_eth_get_macaddr(mac_address);
 }
 
 IPAddress EthernetClass::localIP()

src/STM32Ethernet.h

@@ -17,7 +17,6 @@ class EthernetClass {
   private:
     IPAddress _dnsServerAddress;
     DhcpClass *_dhcp;
-    uint8_t mac_address[6];
 
   public:
     // Initialise the Ethernet with the internal provided MAC address and gain the rest of the
@@ -42,13 +41,13 @@ class EthernetClass {
     int maintain();
     void schedule(void);
 
-    void MACAddress(uint8_t *mac);
-    uint8_t *MACAddress(void);
+    void MACAddress(uint8_t *mac_address);
     IPAddress localIP();
     IPAddress subnetMask();
     IPAddress gatewayIP();
     IPAddress dnsServerIP();
 
+    void setMACAddress(const uint8_t *mac_address);
     void setDnsServerIP(const IPAddress dns_server);
 
     friend class EthernetClient;

src/utility/ethernetif.cpp

@@ -627,11 +627,23 @@ __weak void ethernetif_notify_conn_changed(struct netif *netif)
   */
 void ethernetif_set_mac_addr(const uint8_t *mac)
 {
-  if (mac != NULL) {
+  if ((mac != NULL) && !(ethernetif_is_init())) {
     memcpy(macaddress, mac, 6);
   }
 }
 
+/**
+  * @brief  This function get the current MAC address.
+  * @param  mac: mac address
+  * @retval None
+  */
+void ethernetif_get_mac_addr(uint8_t *mac)
+{
+  if (mac != NULL) {
+    memcpy(mac, macaddress, 6);
+  }
+}
+
 #if LWIP_IGMP
 err_t igmp_mac_filter(struct netif *netif, const ip4_addr_t *ip4_addr, netif_mac_filter_action action)
 {

src/utility/ethernetif.h

@@ -61,6 +61,7 @@ void ethernetif_update_config(struct netif *netif);
 void ethernetif_notify_conn_changed(struct netif *netif);
 
 void ethernetif_set_mac_addr(const uint8_t *mac);
+void ethernetif_get_mac_addr(uint8_t *mac);
 
 #if LWIP_IGMP
 err_t igmp_mac_filter(struct netif *netif, const ip4_addr_t *ip4_addr, netif_mac_filter_action action);

src/utility/stm32_eth.cpp

@@ -268,6 +268,25 @@ uint8_t stm32_eth_is_init(void)
   return ethernetif_is_init();
 }
 
+/**
+  * @brief Set Ethernet MAC address
+  * @param  mac: mac address
+  * @retval None
+  */
+void stm32_eth_set_macaddr(const uint8_t *mac)
+{
+  ethernetif_set_mac_addr(mac);
+}
+/**
+  * @brief Return Ethernet MAC address
+  * @param  mac: mac address
+  * @retval None
+  */
+void stm32_eth_get_macaddr(uint8_t *mac)
+{
+  return ethernetif_get_mac_addr(mac);
+}
+
 /**
   * @brief Return Ethernet link status
   * @param  None

src/utility/stm32_eth.h

@@ -119,6 +119,8 @@ struct tcp_struct {
 /* Exported functions ------------------------------------------------------- */
 void stm32_eth_init(const uint8_t *mac, const uint8_t *ip, const uint8_t *gw, const uint8_t *netmask);
 uint8_t stm32_eth_is_init(void);
+void stm32_eth_get_macaddr(uint8_t *mac);
+void stm32_eth_set_macaddr(const uint8_t *mac);
 uint8_t stm32_eth_link_up(void);
 void stm32_eth_scheduler(void);