Kevin Braun
Ethernet link status for the K64F
Dependents: JRO_CR2 K64F_EthLink_HelloWorld frdm_test JRO_DDSv2
Simple K64F technique to determine if the Ethernet PHY link is up or down. The routine utilizes the Ethernet MII interface to gain access to the Ethernet PHY which contains the actual link status.
I wrote this because the mbed Ethernet function does not recognize its own "int link();" function with the K64F.
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
| k64f_EthLink.cpp | Show annotated file Show diff for this revision Revisions of this file |
| k64f_EthLink.h | Show annotated file Show diff for this revision Revisions of this file |
--- /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
\ No newline at end of file