max77756.cpp

00001 /*******************************************************************************
00002  * Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
00003  *
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00005  * copy of this software and associated documentation files (the "Software"),
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00010  *
00011  * The above copyright notice and this permission notice shall be included
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00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00015  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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00019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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00021  *
00022  * Except as contained in this notice, the name of Maxim Integrated
00023  * Products, Inc. shall not be used except as stated in the Maxim Integrated
00024  * Products, Inc. Branding Policy.
00025  *
00026  * The mere transfer of this software does not imply any licenses
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00032  */
00033 #include "max77756.h"
00034  
00035 /***** Definitions *****/
00036 #define I2C_ADDR            (0x1E<<1)
00037  
00038 //******************************************************************************
00039 MAX77756::MAX77756(PinName sda, PinName scl)
00040 {
00041     i2c_ = new I2C(sda, scl);
00042     i2c_owner = true;
00043  
00044     i2c_->frequency(400000);
00045 }
00046  
00047 //******************************************************************************
00048 MAX77756::MAX77756(I2C *i2c) :
00049     i2c_(i2c)
00050 {
00051     i2c_owner = false;
00052 }
00053  
00054 //******************************************************************************
00055 MAX77756::~MAX77756()
00056 {
00057     if(i2c_owner) {
00058         delete i2c_;
00059     }
00060 }
00061  
00062 //******************************************************************************
00063 int32_t MAX77756::init()
00064 { 
00065     return 0;
00066 }
00067  
00068 //******************************************************************************
00069 int32_t MAX77756::writeReg(MAX77756::registers_t reg_addr, char reg_data)
00070 {
00071     char data[2];
00072  
00073     data[0] = reg_addr;
00074     data[1] = reg_data;
00075     if (i2c_->write(I2C_ADDR, data, 2) != 0) {
00076         return -1;
00077     }
00078  
00079     return 0;
00080 }
00081  
00082 //******************************************************************************
00083 int32_t MAX77756::readReg(MAX77756::registers_t reg_addr)
00084 {
00085     char data;
00086  
00087     data = reg_addr;
00088     if (i2c_->write(I2C_ADDR, &data, 1, true) != 0) {
00089         return -1;
00090     }
00091  
00092     if (i2c_->read(I2C_ADDR | 0x01, &data, 1) != 0) {
00093         return -1;
00094     }
00095  
00096     return (0x0 + data);
00097 }
00098 
00099 //******************************************************************************
00100 int32_t MAX77756::outEnable(MAX77756::Enable_t enable)
00101 {
00102     int32_t data; 
00103     
00104     data = readReg(REG_CONFIGA);
00105     if (data < 0) {
00106         return -1;
00107     }
00108     
00109     data &= (~0x01);
00110     data |= (enable & 0x01);
00111     
00112     data = writeReg(REG_CONFIGA, data & 0xff);
00113     if (data < 0) {
00114         return -1;
00115     }
00116     
00117     return 0;
00118 }
00119 
00120 //******************************************************************************
00121 int32_t MAX77756::setVout(uint32_t outVoltage)
00122 {
00123     int32_t data;
00124     uint32_t bitVolt; 
00125     
00126     if (outVoltage < 1500 || outVoltage > 7500) {
00127         return -1;
00128     }
00129     
00130     bitVolt = (uint32_t)((outVoltage -1500)/50);
00131     data = writeReg(REG_CONFIGB, bitVolt & 0xff);
00132     if (data < 0) {
00133         return -1;
00134     }
00135             
00136     return 0;
00137 }
00138 
00139 //******************************************************************************
00140 int32_t MAX77756::config( MAX77756::SpreadSpectrum_t sspectrum, 
00141                           MAX77756::SoftStart_t sstart,
00142                           MAX77756::PeakCurrent_t ipeak, 
00143                           MAX77756::EnableLogic_t enlogic)
00144 {
00145     int32_t data; 
00146     int32_t config = 0;
00147     
00148     data = readReg(REG_CONFIGA);
00149     if (data < 0) {
00150         return -1;
00151     }
00152     
00153     data &= (~0xF2);
00154     config = (sspectrum << 7) | (sstart << 6) | (ipeak << 4) | (enlogic <<1);
00155     data |= ( config & 0xF2);
00156     
00157     data = writeReg(REG_CONFIGA, data & 0xff);
00158     if (data < 0) {
00159         return -1;
00160     }
00161     
00162     return 0;
00163 }
00164     
00165