Diff: savePower.cpp

Revision:

0:c05b00be2229

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/savePower.cpp	Thu Jul 13 19:33:37 2017 +0000
@@ -0,0 +1,61 @@
+#include "mbed.h"
+#include "sdram.h"
+#include "savePower.h"
+
+static int phy_write(unsigned int PhyReg, unsigned short Data)
+{
+    unsigned int timeOut;
+
+    LPC_EMAC->MADR = DP83848C_DEF_ADR | PhyReg;
+    LPC_EMAC->MWTD = Data;
+
+    for(timeOut = 0; timeOut < MII_WR_TOUT; timeOut++) {     /* Wait until operation completed */
+        if((LPC_EMAC->MIND & MIND_BUSY) == 0) {
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+DigitalOut cke(P2_24);
+Ethernet eth;
+DigitalOut p1_19(P1_19);
+DigitalOut p2_18(P2_18);
+
+
+void savePower(void)
+{
+    /*
+    ------------------------------------------------------->
+    Initialize SDRAM and set CKE 0 to make sure SDRAM is
+    in power-down mode. CKE is also connected to a 1K5 pull
+    down resistor
+     */
+    //  DigitalOut cke(P2_24);
+    sdram_init();
+    cke = 0; // set low not to draw any current
+
+     /* ------------------------------------------------------->
+    Initialize Ethernet by instantiating the Ethernet class
+    The Ethernet interface doesn't contain a power-down
+    method so we reimplement phy_write in this app and
+    puts the PHY in power-down here
+    */
+    // Ethernet eth;
+    
+    phy_write(PHY_REG_BMCR, PHY_BMCR_PWR_DOWN);
+    
+    /*<-------------------------------------------------------
+    must be low to disable U7 (STMPS2171STR)
+    DigitalOut p1_19(P1_19);
+    */
+    p1_19 = 0;
+
+
+    /* p2.18 connected to 1K5 pull-down resistor
+    DigitalOut p2_18(P2_18);
+    */
+    p2_18 = 0;
+
+}
\ No newline at end of file