PowerControl

Published 30 Jan 2010, by Michael Wei
consumption, control, energy, Power
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Show/hide line numbers EthernetPowerControl.cpp Source File
EthernetPowerControl.cpp

00001 #include "EthernetPowerControl.h"
00002 
00003 static void write_PHY (unsigned int PhyReg, unsigned short Value) {
00004    /* Write a data 'Value' to PHY register 'PhyReg'. */
00005    unsigned int tout;
00006    /* Hardware MII Management for LPC176x devices. */
00007    LPC_EMAC->MADR = DP83848C_DEF_ADR | PhyReg;
00008    LPC_EMAC->MWTD = Value;
00009 
00010    /* Wait utill operation completed */
00011    for (tout = 0; tout < MII_WR_TOUT; tout++) {
00012       if ((LPC_EMAC->MIND & MIND_BUSY) == 0) {
00013          break;
00014       }
00015    }
00016 }
00017 
00018 static unsigned short read_PHY (unsigned int PhyReg) {
00019    /* Read a PHY register 'PhyReg'. */
00020    unsigned int tout, val;
00021 
00022    LPC_EMAC->MADR = DP83848C_DEF_ADR | PhyReg;
00023    LPC_EMAC->MCMD = MCMD_READ;
00024 
00025    /* Wait until operation completed */
00026    for (tout = 0; tout < MII_RD_TOUT; tout++) {
00027       if ((LPC_EMAC->MIND & MIND_BUSY) == 0) {
00028          break;
00029       }
00030    }
00031    LPC_EMAC->MCMD = 0;
00032    val = LPC_EMAC->MRDD;
00033    
00034    return (val);
00035 }
00036 
00037 void EMAC_Init()
00038 {
00039   unsigned int tout,regv;
00040   /* Power Up the EMAC controller. */
00041   Peripheral_PowerUp(LPC1768_PCONP_PCENET);
00042   
00043   LPC_PINCON->PINSEL2 = 0x50150105;
00044   LPC_PINCON->PINSEL3 &= ~0x0000000F;
00045   LPC_PINCON->PINSEL3 |= 0x00000005;
00046 
00047   /* Reset all EMAC internal modules. */
00048   LPC_EMAC->MAC1 = MAC1_RES_TX | MAC1_RES_MCS_TX | MAC1_RES_RX | MAC1_RES_MCS_RX |
00049              MAC1_SIM_RES | MAC1_SOFT_RES;
00050   LPC_EMAC->Command = CR_REG_RES | CR_TX_RES | CR_RX_RES;
00051 
00052   /* A short delay after reset. */
00053   for (tout = 100; tout; tout--);
00054 
00055   /* Initialize MAC control registers. */
00056   LPC_EMAC->MAC1 = MAC1_PASS_ALL;
00057   LPC_EMAC->MAC2 = MAC2_CRC_EN | MAC2_PAD_EN;
00058   LPC_EMAC->MAXF = ETH_MAX_FLEN;
00059   LPC_EMAC->CLRT = CLRT_DEF;
00060   LPC_EMAC->IPGR = IPGR_DEF;
00061 
00062   /* Enable Reduced MII interface. */
00063   LPC_EMAC->Command = CR_RMII | CR_PASS_RUNT_FRM;
00064 
00065   /* Reset Reduced MII Logic. */
00066   LPC_EMAC->SUPP = SUPP_RES_RMII;
00067   for (tout = 100; tout; tout--);
00068   LPC_EMAC->SUPP = 0;
00069 
00070   /* Put the DP83848C in reset mode */
00071   write_PHY (PHY_REG_BMCR, 0x8000);
00072 
00073   /* Wait for hardware reset to end. */
00074   for (tout = 0; tout < 0x100000; tout++) {
00075     regv = read_PHY (PHY_REG_BMCR);
00076     if (!(regv & 0x8000)) {
00077       /* Reset complete */
00078       break;
00079     }
00080   }
00081 }
00082 
00083 
00084 void PHY_PowerDown()
00085 {
00086     if (!Peripheral_GetStatus(LPC1768_PCONP_PCENET))
00087         EMAC_Init(); //init EMAC if it is not already init'd
00088     
00089     unsigned int regv;
00090     regv = read_PHY(PHY_REG_BMCR);
00091     write_PHY(PHY_REG_BMCR, regv | (1 << PHY_REG_BMCR_POWERDOWN));
00092     regv = read_PHY(PHY_REG_BMCR);
00093     
00094     //shouldn't need the EMAC now.
00095     Peripheral_PowerDown(LPC1768_PCONP_PCENET);
00096     
00097     //and turn off the PHY OSC
00098      LPC_GPIO1->FIODIR |= 0x8000000;
00099      LPC_GPIO1->FIOCLR = 0x8000000;
00100 }
00101 
00102 void PHY_PowerUp()
00103 {   
00104     if (!Peripheral_GetStatus(LPC1768_PCONP_PCENET))
00105         EMAC_Init(); //init EMAC if it is not already init'd
00106         
00107     LPC_GPIO1->FIODIR |= 0x8000000;
00108     LPC_GPIO1->FIOSET = 0x8000000;
00109     
00110     //wait for osc to be stable
00111     wait_ms(200);
00112     
00113     unsigned int regv;
00114     regv = read_PHY(PHY_REG_BMCR);
00115     write_PHY(PHY_REG_BMCR, regv & ~(1 << PHY_REG_BMCR_POWERDOWN));
00116     regv = read_PHY(PHY_REG_BMCR);
00117 }
00118 
00119 void PHY_EnergyDetect_Enable()
00120 {
00121     if (!Peripheral_GetStatus(LPC1768_PCONP_PCENET))
00122         EMAC_Init(); //init EMAC if it is not already init'd
00123         
00124     unsigned int regv;
00125     regv = read_PHY(PHY_REG_EDCR);
00126     write_PHY(PHY_REG_BMCR, regv | (1 << PHY_REG_EDCR_ENABLE));
00127     regv = read_PHY(PHY_REG_EDCR);   
00128 }
00129 
00130 void PHY_EnergyDetect_Disable()
00131 {
00132     if (!Peripheral_GetStatus(LPC1768_PCONP_PCENET))
00133         EMAC_Init(); //init EMAC if it is not already init'd
00134     unsigned int regv;
00135     regv = read_PHY(PHY_REG_EDCR);
00136     write_PHY(PHY_REG_BMCR, regv & ~(1 << PHY_REG_EDCR_ENABLE));
00137     regv = read_PHY(PHY_REG_EDCR);   
00138 }