Wunused-variable: Fixed all unused variables in src

This commit addresses all warnings emitted from -Wunused-variable
in the C++ src.

Signed-off-by: Noel Eck <noel.eck@intel.com>

src/ads1x15/ads1015.cxx

@@ -149,7 +149,6 @@ ADS1015::setDelay(){
 
 ADS1X15::ADSMUXMODE
 ADS1015::getMuxMode(unsigned int input) {
-    ADS1X15::ADSMUXMODE mode;
     switch (input) {
     case 0:
         return SINGLE_0;

src/am2315/am2315.cpp

@@ -199,7 +199,12 @@ AM2315::i2cWriteReg(uint8_t reg, uint8_t* data, uint8_t ilen)
     tdata[ilen+3] = crc;
     tdata[ilen+4] = (crc >> 8);
 
-    mraa_result_t ret = mraa_i2c_address(m_i2ControlCtx, m_controlAddr);
+    if (mraa_i2c_address(m_i2ControlCtx, m_controlAddr) != MRAA_SUCCESS)
+    {
+        fprintf(stdout, "Error, setting i2c address.\n");
+        return -1;
+    }
+
     int iLoops = 5;
     mraa_set_priority(HIGH_PRIORITY);
     do {

src/ecs1030/ecs1030.cxx

@@ -53,7 +53,6 @@ ECS1030::~ECS1030 () {
 double
 ECS1030::getCurrency_A () {
     int     sensorValue  = 0;
-    float   rLoad        = 0;
     float   volt         = 0;
     float   rms          = 0;
 

src/grovescam/grovescam.cxx

@@ -98,7 +98,6 @@ bool GROVESCAM::dataAvailable(unsigned int millis)
       timeout.tv_usec = (millis % 1000) * 1000;
     }
 
-  int nfds;  
   fd_set readfds;
 
   FD_ZERO(&readfds);

src/groveultrasonic/groveultrasonic.cxx

@@ -34,7 +34,6 @@
 using namespace upm;
 
 GroveUltraSonic::GroveUltraSonic (uint8_t pin) {
-    mraa_result_t error = MRAA_SUCCESS;
     m_name = "GroveUltraSonic";
 
     mraa_init();

src/hcsr04/hcsr04.cxx

@@ -39,7 +39,6 @@
 using namespace upm;
 
 HCSR04::HCSR04 (uint8_t triggerPin, uint8_t echoPin) {
-    mraa_result_t error  = MRAA_SUCCESS;
     m_name              = "HCSR04";
 
     m_triggerPinCtx     = mraa_gpio_init (triggerPin);

src/hm11/hm11.cxx

@@ -82,7 +82,6 @@ bool HM11::dataAvailable(unsigned int millis)
   timeout.tv_sec = 0;
   timeout.tv_usec = millis * 1000;
 
-  int nfds;  
   fd_set readfds;
 
   FD_ZERO(&readfds);

src/hmtrp/hmtrp.cxx

@@ -85,7 +85,6 @@ bool HMTRP::dataAvailable(unsigned int millis)
   timeout.tv_sec = 0;
   timeout.tv_usec = millis * 1000;
 
-  int nfds;  
   fd_set readfds;
 
   FD_ZERO(&readfds);

src/htu21d/htu21d.cpp

@@ -174,7 +174,7 @@ HTU21D::getDewPoint(int bSampleData)
 int
 HTU21D::getHumidityData(float* pfHum, float* pfHumTemp, float* pfDewPt)
 {
-    float fHum   = getHumidity(true);
+    getHumidity(true);
     float fTemp  = getTemperature(false);
     float fDewPt = getDewPoint(false);
     float fCHum  = getCompRH(false);
@@ -271,7 +271,6 @@ HTU21D::i2cWriteReg (uint8_t reg, uint8_t value) {
 
 uint16_t
 HTU21D::i2cReadReg_16 (int reg) {
-    uint16_t data;
     m_i2ControlCtx.address(m_controlAddr);
     return m_i2ControlCtx.readWordReg(reg);
 }

src/kxcjk1013/kxcjk1013.cxx

@@ -179,7 +179,6 @@ KXCJK1013::extract3Axis(char* data, float* x, float* y, float* z)
 {
     mraa_iio_channel* channels = mraa_iio_get_channels(m_iio);
     float tmp[3];
-    int i = 0;
     int iio_x, iio_y, iio_z;
 
     iio_x = getChannelValue((unsigned char*) (data + channels[0].location), &channels[0]);

src/lcd/lcm1602.cxx

@@ -109,7 +109,6 @@ Lcm1602::Lcm1602(uint8_t rs,  uint8_t enable, uint8_t d0,
   m_gpioD2(new mraa::Gpio(d2)), m_gpioD3(new mraa::Gpio(d3)),
   m_numColumns(numColumns), m_numRows(numRows)
 {
-    mraa::Result error = mraa::SUCCESS;
     m_name = "Lcm1602 (4-bit GPIO)";
     m_isI2C = false;
     m_backlight = LCD_BACKLIGHT;
@@ -202,7 +201,6 @@ Lcm1602::write(std::string msg)
 mraa::Result
 Lcm1602::setCursor(int row, int column)
 {
-    mraa::Result error = mraa::SUCCESS;
     column = column % m_numColumns;
     uint8_t offset = column;
 

src/lcd/ssd1308.cxx

@@ -78,15 +78,12 @@ SSD1308::draw(uint8_t* data, int bytes)
 mraa::Result
 SSD1308::write(std::string msg)
 {
-    mraa::Result error = mraa::SUCCESS;
-    uint8_t data[2] = { 0x40, 0 };
-
     setAddressingMode(PAGE);
     for (std::string::size_type i = 0; i < msg.size(); ++i) {
         writeChar(msg[i]);
     }
 
-    return error;
+    return mraa::SUCCESS;
 }
 
 mraa::Result
@@ -108,7 +105,6 @@ SSD1308::setCursor(int row, int column)
 mraa::Result
 SSD1308::clear()
 {
-    mraa::Result error = mraa::SUCCESS;
     uint8_t columnIdx, rowIdx;
 
     m_i2c_lcd_control.writeReg(LCD_CMD, DISPLAY_CMD_OFF); // display off

src/lcd/ssd1327.cxx

@@ -215,7 +215,6 @@ SSD1327::setCursor(int row, int column)
 mraa::Result
 SSD1327::clear()
 {
-    mraa::Result error = mraa::SUCCESS;
     uint8_t columnIdx, rowIdx;
 
     for (rowIdx = 0; rowIdx < 12; rowIdx++) {

src/lol/lol.cxx

@@ -136,7 +136,6 @@ void *do_draw(void *arg)
 
 LoL::LoL() {
     int i = 0;
-    mraa_result_t error;
     for (i = 0; i < 12; i++)
       {
         if ( !(m_LoLCtx[i] = mraa_gpio_init(i+2)) ) 
@@ -159,7 +158,6 @@ LoL::LoL() {
 
 LoL::~LoL() {
     int i = 0;
-    mraa_result_t error;
     for (i = 0; i < 12; i++)
         mraa_gpio_close(m_LoLCtx[i]);
 }

src/max44009/max44009.cxx

@@ -64,7 +64,6 @@ MAX44009::reset() {
 
 uint16_t
 MAX44009::getVisibleRaw() {
-    uint8_t exponent, mantissa;
     uint8_t data[MAX44009_LUX_LENGTH];
     uint16_t* value = reinterpret_cast<uint16_t*>(&data[0]);
 

src/max5487/max5487.cxx

@@ -57,7 +57,7 @@ MAX5487::setWiperA (uint8_t wiper) {
     data[0] = R_WR_WIPER_A;
     data[1] = wiper;
 
-    uint8_t* retData = m_spi.write(data, 2);
+    m_spi.write(data, 2);
 
     CSOff ();
 }
@@ -71,7 +71,7 @@ MAX5487::setWiperB (uint8_t wiper) {
     data[0] = R_WR_WIPER_B;
     data[1] = wiper;
 
-    uint8_t* retData = m_spi.write(data, 2);
+    m_spi.write(data, 2);
 
     CSOff ();
 }

src/mhz16/mhz16.cxx

@@ -84,7 +84,6 @@ bool MHZ16::dataAvailable(unsigned int millis)
   timeout.tv_sec = 0;
   timeout.tv_usec = millis * 1000;
 
-  int nfds;  
   fd_set readfds;
 
   FD_ZERO(&readfds);

src/mma7455/mma7455.cxx

@@ -37,7 +37,6 @@ using namespace upm;
 
 MMA7455::MMA7455 (int bus, int devAddr) : m_i2ControlCtx(bus) {
     unsigned char data   = 0;
-    int           nBytes = 0;
 
     m_name = "MMA7455";
 
@@ -98,7 +97,6 @@ MMA7455::calibrate () {
 mraa::Result
 MMA7455::readData (short * ptrX, short * ptrY, short * ptrZ) {
     accelData xyz;
-    unsigned char data = 0;
     int nBytes = 0;
 
     /*do {

src/mpl3115a2/mpl3115a2.cpp

@@ -72,8 +72,7 @@ MPL3115A2::MPL3115A2 (int bus, int devAddr, uint8_t mode) : m_i2ControlCtx(bus)
 int
 MPL3115A2::testSensor(void)
 {
-    int i, iTries;
+    int iTries;
-    int iError = 0;
     float pressure, temperature;
     float fPMin, fPMax, fTMin, fTMax;
 
@@ -113,7 +112,7 @@ MPL3115A2::testSensor(void)
 void
 MPL3115A2::dumpSensor(void)
 {
-    int i, j, ival;
+    int i, j;
 
     fprintf(stdout, "Dumping i2c block from %s\n", MPL3115A2_NAME);
     for (i=0; i < 256; i+=16) {

src/ms5611/ms5611.cxx

@@ -144,8 +144,7 @@ void MS5611::setOverSampling(OsrMode osrMode)
 
 void MS5611::delayms(int millisecs)
 {
-   struct timespec sleepTime, rem;
+   struct timespec sleepTime;
-   uint64_t nanosecs = 1000ULL * millisecs;
    sleepTime.tv_sec = millisecs / 1000;
    sleepTime.tv_nsec = (millisecs % 1000) * 1000000;
    while ((nanosleep( &sleepTime, &sleepTime ) != 0 ) && ( errno == EINTR ) );

src/pn532/pn532.cxx

@@ -200,8 +200,6 @@ uint32_t PN532::getFirmwareVersion()
 bool PN532::sendCommandCheckAck(uint8_t *cmd, uint8_t cmdlen, 
                                 uint16_t timeout)
 {
-  uint16_t timer = 0;
-
   // clear any outstanding irq's
   isReady();
   
@@ -747,7 +745,6 @@ bool PN532::mifareclassic_AuthenticateBlock (uint8_t * uid, uint8_t uidLen,
                                              uint8_t keyNumber,
                                              uint8_t * keyData)
 {
-  uint8_t len;
   uint8_t i;
   
   // Hang on to the key and uid data

src/scam/scam.cxx

@@ -98,7 +98,6 @@ bool SCAM::dataAvailable(unsigned int millis)
       timeout.tv_usec = (millis % 1000) * 1000;
     }
 
-  int nfds;  
   fd_set readfds;
 
   FD_ZERO(&readfds);

src/ultrasonic/ultrasonic.cxx

@@ -34,7 +34,6 @@
 using namespace upm;
 
 UltraSonic::UltraSonic (uint8_t pin) {
-    mraa_result_t error = MRAA_SUCCESS;
     m_name = "UltraSonic";
 
     mraa_init();

src/wt5001/wt5001.cxx

@@ -85,7 +85,6 @@ bool WT5001::dataAvailable(unsigned int millis)
   timeout.tv_sec = 0;
   timeout.tv_usec = millis * 1000;
 
-  int nfds;  
   fd_set readfds;
 
   FD_ZERO(&readfds);

src/zfm20/zfm20.cxx

@@ -90,7 +90,6 @@ bool ZFM20::dataAvailable(unsigned int millis)
   timeout.tv_sec = 0;
   timeout.tv_usec = millis * 1000;
 
-  int nfds;  
   fd_set readfds;
 
   FD_ZERO(&readfds);
@@ -281,7 +280,6 @@ bool ZFM20::getResponse(uint8_t *pkt, int len)
   int idx = 0;
   int timer = 0;
   int rv;
-  int plen = 0;
 
   while (idx < len)
     {