We want to interface a 3 axis accelerometer with WICED-Wifi dev kit.the follwing is the code we came up with

[Anonymous]

#include "wiced.h"

#include "stdio.h"

void application_start( )

{

    int i;

    unsigned int x,y,z;

    wiced_init( );

    for(i=0;i<5000;i++)

    {

    wiced_result_t wiced_adc_init(wiced_adc_t adc1,uint32_t);

    wiced_result_t wiced_adc_take_sample( wiced_adc_t adc1, uint16_t* x );

    wiced_result_t wiced_adc_init(wiced_adc_t adc2, uint32_t );

    wiced_result_t wiced_adc_take_sample( wiced_adc_t adc2, uint16_t* y );

    wiced_result_t wiced_adc_init(wiced_adc_t adc3, uint32_t );

    wiced_result_t wiced_adc_take_sample( wiced_adc_t adc3, uint16_t* z );

    }

    x=x-338;

    y=y-338;

    z=z-338;

    printf("x=%d\ny=%d\nz=%d\n",x,y,z);

    wiced_result_t wiced_adc_deinit( wiced_adc_t adc1 );

    wiced_result_t wiced_adc_deinit( wiced_adc_t adc2 );

    wiced_result_t wiced_adc_deinit( wiced_adc_t adc3 );

}

We are getting a zero output for all x,y,z.

Please help

[SeyhanA_31]

Hi,

No need to keep initialize the adc, wiced_adc_init(...), before each reading of the adc value. Initialize the acd outside of the loop. Then the wiced_adc_take_sample(...) could be called to within a loop to read the ADC values.

For sample code, you may look at the .../apps/demo/temp_control/temp_control.c for initializing the ADC then reading the ADC values.

You may try following simple code as well.

/*
 * Copyright 2014, Broadcom Corporation
 * All Rights Reserved.
 *
 * This is UNPUBLISHED PROPRIETARY SOURCE CODE of Broadcom Corporation;
 * the contents of this file may not be disclosed to third parties, copied
 * or duplicated in any form, in whole or in part, without the prior
 * written permission of Broadcom Corporation.
 */

/** @file
 *
 * ADC Read Sample
 *
 */

#include <stdlib.h>
#include "wiced.h"

/******************************************************
 *                      Macros
 ******************************************************/

/******************************************************
 *                    Constants
 ******************************************************/

#define THERMISTOR_ADC        (WICED_THERMISTOR_JOINS_ADC) // thermistor on eval board
#define ADC_READ_DELAYS        (200) // msec

/******************************************************
 *                   Enumerations
 ******************************************************/

/******************************************************
 *                 Type Definitions
 ******************************************************/

/******************************************************
 *                    Structures
 ******************************************************/

/******************************************************
 *               Static Function Declarations
 ******************************************************/

/******************************************************
 *               Variable Definitions
 ******************************************************/

/******************************************************
 *               Function Definitions
 ******************************************************/

void application_start( )
{
    wiced_init( );
    /* Initialize ADC */
    wiced_adc_init(THERMISTOR_ADC, 5);
    uint16_t adcValue;
    while(1)
    {
        wiced_result_t result = wiced_adc_take_sample(THERMISTOR_ADC, &adcValue);

        if (result == WICED_SUCCESS)
            WPRINT_APP_INFO(("ADC Value read (thermistor)=0x%x\n", adcValue));
        else
            WPRINT_APP_INFO(("ADC read error=%d\n", result));

        wiced_rtos_delay_milliseconds(ADC_READ_DELAYS);
    }
}

Seyhan