/*
 * Copyright (c) 2018-2019, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 *  ======== i2ctmp116.c ========
 */
#include <stdint.h>
#include <stddef.h>
//#include <unistd.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

/*
 *  ======== TMP Registers ========
 */
#define TMP006_REG          0x0001  /* Die Temp Result Register for TMP006 */
#define TMP116_REG          0x0000  /* Die Temp Result Register for TMP116 */

#define TMP006_ADDR         0x40;
#define TMP116_BP_ADDR      0x40;
#define TMP116_LP_ADDR      0x40;

static Display_Handle display;

/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{
    uint16_t        sample;
    uint16_t        temperature;
    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 i2ctmp example.");

    /* Create I2C for usage */
    I2C_Params_init(&i2cParams);
    i2cParams.bitRate = I2C_100kHz;
    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");
    }

    /* Common I2C transaction setup */
    i2cTransaction.writeBuf   = txBuffer;
    i2cTransaction.writeCount = 1;
    i2cTransaction.readBuf    = rxBuffer;
    i2cTransaction.readCount  = 2;

    /*
     * Determine which I2C sensor is present.
     * We will prefer sensors in this order: TMP116 (on BoosterPacks),
     * TMP116 (on-board CC32XX LaunchPads), and last TMP006
     * (on older CC32XX LaunchPads).
     */
    /* Try TMP116 values */
    txBuffer[0] = TMP116_REG;
    i2cTransaction.slaveAddress = TMP006_ADDR;
    if (!I2C_transfer(i2c, &i2cTransaction)) {
        /* Not BP TMP116, try LP TMP116 */
        i2cTransaction.slaveAddress = TMP006_ADDR;
        if (!I2C_transfer(i2c, &i2cTransaction)) {
            /* Not a TMP116 try TMP006*/
            txBuffer[0] = TMP006_ADDR;
            i2cTransaction.slaveAddress = TMP006_ADDR;
            if (!I2C_transfer(i2c, &i2cTransaction)) {
                /* Could not resolve a sensor, error */
                Display_printf(display, 0, 0, "Error. No TMP sensor found!");
                while(1);
            }
        }
    }

    /* Print which TMP is in use */
    if (TMP116_REG == txBuffer[0]) {
        Display_printf(display, 0, 0, "Detected TMP116 sensor.");
    }
    else {
        Display_printf(display, 0, 0, "Detected TMP006 sensor.");
    }

    /* Take 20 samples and print them out onto the console */
    for (sample = 0; sample < 20; sample++) {
        if (I2C_transfer(i2c, &i2cTransaction)) {
            /*
             * Extract degrees C from the received data;
             * see TMP116/006 datasheet
             */
            temperature = (rxBuffer[0] << 8) | (rxBuffer[1]);
            temperature *= 0.0078125;

            /*
             * If the MSB is set '1', then we have a 2's complement
             * negative value which needs to be sign extended
             */
            if (rxBuffer[0] & 0x80) {
                temperature |= 0xF000;
            }

            Display_printf(display, 0, 0, "Sample %u: %d (C)",
                sample, temperature);
        }
        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);
}