Revision 0:a447869e1046, committed 2014-09-30

Comitter:

loopsva

Date:

Tue Sep 30 21:48:34 2014 +0000

Child:

1:cbd7e77b6e38

Commit message:

Crude driver for obtaining the K64F's Ethernet link status

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/k64f_EthLink.cpp	Tue Sep 30 21:48:34 2014 +0000
@@ -0,0 +1,34 @@
+#include "k64f_EthLink.h"
+#include "rtos.h"
+
+//--------------------------------------------------------------------------------------------------------------------------------------//
+// Constructor
+
+k64fEthLink::k64fEthLink() {
+}
+
+//--------------------------------------------------------------------------------------------------------------------------------------//
+// Get Ethernet link status on the K64F
+
+int k64fEthLink::GetELink() {
+    int mdio_timer = 0;
+    uint32_t k64f_mdio_reg = ENET_EIR;
+    
+    //wait for MDIO interface to be ready
+    do {
+        k64f_mdio_reg = ENET_EIR;
+        Thread::wait(1);            //release RTOS to do other functions
+        mdio_timer++;
+    } while(((k64f_mdio_reg & MDIO_MII_READY_BIT) == 0) && (mdio_timer < 200));
+    if(mdio_timer > 198) {          //average is about 122mS
+        return(MDIO_TIMEOUT);       //timeout error
+    }   
+    
+    //get Basic Status Register
+    ENET_MMFR = MDIO_GET_LINK_REG;
+    wait_us(35);                    //20 is absolute minimum!!
+    k64f_mdio_reg = ENET_MMFR;      //get the phy result
+    if(k64f_mdio_reg & MDIO_MII_LINK_BITS) return(PHY_UP);
+    return(PHY_DOWN);
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/k64f_EthLink.h	Tue Sep 30 21:48:34 2014 +0000
@@ -0,0 +1,55 @@
+#ifndef K64FLINK_H
+#define K64FLINK_H
+
+#include "mbed.h"
+
+/** Software routine used to get Ethernet Link status from the KSZ8081 
+ *  Ethernet PHY on the FRDM-K64F via the K64F MDIO interface. 
+ * 
+ * @code
+ * //See K64F_EthLink_HelloWorld example
+ * @endcode
+*/
+
+#define MDIO_MII_READY_BIT      0x00800000  //Bit in ENET_EIR reister that allows access to ENET_MMFR register
+#define MDIO_MII_LINK_BITS      0x0004      //Ethernet Link Up / Down bit in Phy's Basic Status Register
+#define MDIO_GET_LINK_REG       0x60060000  //command for ENET_MMFR register to read Phy's Basic Status
+//                                |-------  ST = 01 start of frame                  31,30
+//                                |-------  OP = 10 read                            29,28
+//                                 ||-----  PA = 00000 phy address                  27,26,25,24,23
+//                                  ||----  RA = 00001 phy register Basic Status    22,21,20,19,18
+//                                   |----  TA = 10 turn around                     17,16
+//                                    ||||  DATA
+
+
+    /** k64f_phy_status Ethernet link result enumator
+     *
+     * @param k64f_phy_status enumator
+     *
+     */
+enum k64f_phy_status {PHY_UP = 0, PHY_DOWN = 1, MDIO_TIMEOUT = 2};
+
+    /** Create k64fEthLink controller class
+     *
+     * @param k64fEthLink class
+     *
+     */
+class k64fEthLink {
+
+public:
+    /** Create a k64fEthLink object
+     *
+     * @param -none-
+     */
+    k64fEthLink();
+    /** Return Ethernet Link Status
+     *
+     * @param -none-
+     *
+     * @return the link status code from enum k64f_phy_status
+     */
+    int GetELink();
+
+};
+
+#endif
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