RTOS/LAUNCHXL-CC1310: Read data from sensor HDC1080 via I2C

macc.n

Prodigy 110 points

Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: HDC1080, , CC1310, CC2650, CC2560, TMP102

Tool/software: TI-RTOS

Hello everybody,

I want to read data from the sensor HDC1080. I connected it to the LAUNCHXL-CC1310's I2C ports.

I added the following line to CC1310_LAUNCHXL.h:

#define Board_I2C_TMP CC1310_LAUNCHXL_I2C0

and I'm trying the code linked here for my purpose.

When I run the program, it returns an error when he tries to open the comunication with the following line of code:

i2c = I2C_open(Board_I2C_TMP, &i2cParams);

How can i fix this problem?

Thanks in advance for the help.

over 8 years ago

0 YiKai Chen over 8 years ago

Guru 735685 points

Try to refer to sunmaysky.blogspot.tw/.../basic-example-to-use-hdc1080-on-cc2650.html

0 macc.n over 8 years ago in reply to YiKai Chen

Prodigy 110 points

I'm already trying that example. I get an error when the code executes the following line:

i2c = I2C_open(Board_I2C_TMP, &i2cParams);

The function I2C_open returns a null value.

0 YiKai Chen over 8 years ago

Guru 735685 points

If you run i2ctmp007 example without modification, does it work?

0 Siri over 8 years ago in reply to YiKai Chen

TI__Guru* 86581 points

Have you made sure that you connec to the correct IOs? The link you have for the CC2650 says that IOID_5 and 6 are used, but both the CC2560 and the CC13xx LPs uses IOID_4 and IOID_5 for I2C (see the CC1310_LAUNCHXL.h)

0 macc.n over 8 years ago in reply to YiKai Chen

Prodigy 110 points

Yes, the examples works. It can open the communication. I don't understand why this happens, because the two codes seem equivalent.

0 macc.n over 8 years ago in reply to Siri

Prodigy 110 points

Yes, I'm using the right IOs

0 macc.n over 8 years ago in reply to macc.n

Prodigy 110 points

I fixed the code and now the function I2C_open works.
Now the problem is in the function I2C_transfer. I'm trying to write the configuration for the HDC1080 using the following code:
txBuffer[0] = 0x02;
txBuffer[1] = 0x10;
txBuffer[2] = 0x00;
i2cTransaction.slaveAddress = 0x40;//HDC1080 ADDR;
i2cTransaction.writeBuf = txBuffer;
i2cTransaction.writeCount = 3;
i2cTransaction.readBuf = rxBuffer;
i2cTransaction.readCount = 0;

if (I2C_transfer(i2c, &i2cTransaction)){
System_printf("Configurazione OK\n");
} else {
System_printf("Configurazione fallita\n");
}
But it crashes when I2C_transfer is execute.
How can I fix this?

0 YiKai Chen over 8 years ago in reply to macc.n

Guru 735685 points

Try the following codes

/*
* Copyright (c) 2016-2017, 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;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
*    ======== i2ctmp007.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

#define TMP007_DIE_TEMP     0x0001 /* Die Temp Result Register */
#define TMP007_OBJ_TEMP     0x0003 /* Object Temp Result Register */

static Display_Handle display;

/*
* ======== mainThread ========
*/
void *mainThread(void *arg0)
{
    unsigned int    i;
    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();

    /* 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 i2ctmp007 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");
    }

    /* Point to the T ambient register and read its 2 bytes */

    /* Take 20 samples and print them out onto the console */
    for (i = 0; i < 20; i++) {
        txBuffer[0] = 0x00;
        i2cTransaction.slaveAddress = 0x40;
        i2cTransaction.writeBuf = txBuffer;
        i2cTransaction.writeCount = 1;
        i2cTransaction.readBuf = rxBuffer;
        i2cTransaction.readCount = 0;
        if (I2C_transfer(i2c, &i2cTransaction)) {
            Display_printf(display, 0, 0, "Temp/Humd!\n");
        }else{
            Display_printf(display, 0, 0, "Temp/Humd failed!\n");
        }
        sleep(1);
        txBuffer[0] = 0x00;
        i2cTransaction.slaveAddress = 0x40;
        i2cTransaction.writeBuf = txBuffer;
        i2cTransaction.writeCount = 0;
        i2cTransaction.readBuf = rxBuffer;
        i2cTransaction.readCount = 4;
        if (I2C_transfer(i2c, &i2cTransaction)) {
            /* Extract degrees C from the received data; see TMP102 datasheet */
            temperature = (rxBuffer[2] << 8) | (rxBuffer[3]);

            /*
             * If the MSB is set '1', then we have a 2's complement
             * negative value which needs to be sign extended
             */
            /*
            * For simplicity, divide the temperature value by 32 to get rid of
            * the decimal precision; see TI's TMP007 datasheet
            */
            temperature = ((double)temperature / 65536)*100;

            //Display_printf(display, 0, 0, "Sample %u: %d (C)\n", i, temperature);
            Display_printf(display, 0, 0, "Sample H %u: %d (%)\n", i, temperature);
            //Display_printf(display, 0, 0, "MID %x: %x (C)\n", i, rxBuffer[1],rxBuffer[0]);
        }
        else {
            Display_printf(display, 0, 0, "I2C Bus fault\n");
        }

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

    /* Deinitialized I2C */
    I2C_close(i2c);
    Display_printf(display, 0, 0, "I2C closed!\n");

    return (NULL);
}

0 macc.n over 8 years ago in reply to YiKai Chen

Prodigy 110 points

Yes, it works. Thank you for the help.

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RTOS/LAUNCHXL-CC1310: Read data from sensor HDC1080 via I2C