CCS/LAUNCHXL-CC1350: how to print two decimal points

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 * Copyright (c) 2018-2019, Texas Instruments Incorporated
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 *    from this software without specific prior written permission.
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/*
 *  ======== i2ctmp116.c ========
 */
#include <stdint.h>
#include <stddef.h>
#include <unistd.h>
#include <stdio.h>
//#include <stdlib.h>
//#include <math.h>
/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/I2C.h>
#include <ti/display/Display.h>

/* Example/Board Header files */
#include "Board.h"

#define TASKSTACKSIZE       640

/* TMP116 DIE Temp Result Register */
#define TMP116_DIE_TEMP     0xE3
#define Si7021_ADDR         0x40
static Display_Handle display;

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    //uint16_t        sample;
    float        temperature;
    double        temper;
    float        humidity;
    double        humi;
    uint8_t         txBuffer[1];
    uint8_t         rxBuffer[2];
    I2C_Handle      i2c;
    I2C_Params      i2cParams;
    I2C_Transaction i2cTransaction;

    /* Call driver init functions */
    Display_init();
    GPIO_init();
    I2C_init();

    /* Configure the LED and if applicable, the TMP116_EN pin */
    GPIO_setConfig(Board_GPIO_LED0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
#ifdef Board_GPIO_TMP116_EN
    GPIO_setConfig(Board_GPIO_TMP116_EN, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_HIGH);
    /* 1.5 ms reset time for the TMP116 */
    sleep(1);
#endif

    /* Open the HOST display for output */
    display = Display_open(Display_Type_UART, NULL);
    if (display == NULL) {
        while (1);
    }

    /* Turn on user LED */
    GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);
    Display_printf(display, 0, 0, "Starting the i2ctmp116 example\n");

    /* Create I2C for usage */
    I2C_Params_init(&i2cParams);
    i2cParams.bitRate = I2C_400kHz;
    i2c = I2C_open(Board_I2C_TMP, &i2cParams);
    if (i2c == NULL) {
        Display_printf(display, 0, 0, "Error Initializing I2C\n");
        while (1);
    }
    else {
        Display_printf(display, 0, 0, "I2C Initialized!\n");
    }

    while(1)
    {
        /* Point to the die tempature register and read its 2 bytes */
        txBuffer[0] = 0xE3;
        i2cTransaction.slaveAddress = Si7021_ADDR;
        i2cTransaction.writeBuf = txBuffer;
        i2cTransaction.writeCount = 1;
        i2cTransaction.readBuf = rxBuffer;
        i2cTransaction.readCount = 2;

        if (I2C_transfer(i2c, &i2cTransaction))
        {
            //char buf[64];
            temper = (rxBuffer[0] << 8) | (rxBuffer[1]);
            temperature = (175.72*temper)/65536;
            temperature -= 46.85;
           // sprintf(buf,"Buffer:%3.2fC\n",temperature);
            Display_printf(display, 1, 0, "Temp:%3.2fC\n",temperature);
           // Display_printf(display, 1, 0, "%s\n",buf);
        }
        else
        {
            Display_printf(display, 0, 0, "I2C Bus fault.");
        }

        txBuffer[0] = 0xE5;
        i2cTransaction.slaveAddress = Si7021_ADDR;
        i2cTransaction.writeBuf = txBuffer;
        i2cTransaction.writeCount = 1;
        i2cTransaction.readBuf = rxBuffer;
        i2cTransaction.readCount = 2;

        if (I2C_transfer(i2c, &i2cTransaction))
        {
            humi = (rxBuffer[0] << 8) | (rxBuffer[1]);
            humidity = (125*humi)/65536;
            humidity -=6;
            Display_printf(display, 0, 0, "Humi:%.1f%c",humidity,37);
        }
        else
        {
            Display_printf(display, 0, 0, "I2C Bus fault.");
        }

        /* Sleep for 1 second */
        sleep(1);
    }

    //I2C_close(i2c);
   // Display_printf(display, 0, 0, "I2C closed!");

  //  return (NULL);
}