Diff: MAX17043.cpp

Revision:

0:4287b7d9c9ca

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MAX17043.cpp	Sun Jul 01 12:00:52 2018 +0000
@@ -0,0 +1,118 @@
+/* MAX17043.cpp
+ * Tested with mbed board: FRDM-KL46Z
+ * Author: Mark Gottscho
+ * mgottscho@ucla.edu
+ */
+
+
+#include "mbed.h"
+#include "MAX17043.h"
+#include <new>
+
+MAX17043::MAX17043(PinName sda, PinName scl, int i2c_addr) : i2c_(*reinterpret_cast<I2C*>(i2cRaw)), __i2c_addr(i2c_addr)
+{
+    // Placement new to avoid additional heap memory allocation.
+    new(i2cRaw) I2C(sda, scl);
+
+    selfInit();
+}
+
+MAX17043::MAX17043(I2C &i2c, int i2c_addr): i2c_(i2c), __i2c_addr(i2c_addr)
+{
+    selfInit();
+}
+
+MAX17043::~MAX17043() { }
+
+void MAX17043::selfInit()
+{
+    __soc = 0;
+    __vcell = 0;
+    reset();
+}
+
+void MAX17043::reset()
+{
+    uint16_t data = RST_CODE;
+    setRegister16b(COMMAND_MSB, data);
+    wait(0.130); //wait 130ms until first readings are valid (125ms est)
+}
+
+uint16_t MAX17043::getVersion()
+{
+    uint8_t data = getRegister(VERSION_MSB);
+    return (data << 8) | (getRegister(VERSION_LSB));
+}
+
+uint16_t MAX17043::getVCell()
+{
+    uint16_t data = getRegister16b(VCELL_MSB);
+    __vcell = data >> 4; //right shift by 4 to throw out the don't care bits
+    return __vcell;
+}
+
+float MAX17043::getFloatVCell()
+{
+    return getVCell() * DIV_VCELL;
+}
+
+uint16_t MAX17043::getSOC()
+{
+    uint8_t data = getRegister(SOC_MSB);
+    __soc =  (data << 8) | (getRegister(SOC_LSB));
+    return __soc;
+}
+
+float MAX17043::getFloatSOC()
+{
+    return getSOC() * DIV_SOC;
+}
+
+
+void MAX17043::setRegister16b(const uint8_t reg_addr, const uint16_t data)
+{
+    uint8_t dataMSB = (data >> 8) & 0x00FF;
+    uint8_t dataLSB = data & 0x00FF;
+    uint8_t payload[3] = {reg_addr, dataMSB, dataLSB};
+    __writeReg(payload, 3);
+}
+void MAX17043::setRegister(const uint8_t reg_addr, const uint8_t data)
+{
+    uint8_t payload[2] = {reg_addr, data};
+    __writeReg(payload, 2);
+}
+
+uint8_t MAX17043::getRegister(const uint8_t reg_addr)
+{
+    uint8_t data;
+    __readReg(reg_addr, &data, 1);
+    return data;
+}
+
+uint16_t MAX17043::getRegister16b(const uint8_t reg_addr)
+{
+    uint8_t payload[2];
+    __readReg(reg_addr, payload, 2);
+    uint16_t data = (payload[0] << 8) | (payload[1]);
+    return data;
+}
+int MAX17043::__readReg(const uint8_t reg_addr, uint8_t *data, int len)
+{
+    int retval = 0;
+
+    retval = i2c_.write(__i2c_addr, (char *) &reg_addr, 1, true);
+    if (retval != 0) {
+        return retval;
+    }
+    retval = i2c_.read(__i2c_addr, (char *) data, len);
+
+    return retval;
+}
+
+int MAX17043::__writeReg(const uint8_t *data, int total_len)
+{
+    int retval = 0;
+    retval = i2c_.write(__i2c_addr, (char *) data, total_len);
+
+    return retval;
+}