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NoKo_3612966
New Contributor

I'm working on CY8CKIT-062S2-43012.

* Create project from AnyCloud_BLE_Battery_Service.

* I'd like to change sending POT voltage as the battery level.

Add code to initialize and get ADC value.

However, execution stop at `cyhal_adc_read_u16();` It does not return value.

File `cyhal_adc.c` function `cyhal_adc_read()`, the following infinity loop does not break.

`while(!obj->adc->conversion_complete) { }`

How to use ADC?

```

int main()

{

    cy_rslt_t result ;

    /* Initialize the board support package */

    result = cybsp_init();

    if (CY_RSLT_SUCCESS != result)

    {

        CY_ASSERT(0);

    }

    /* Enable global interrupts */

    __enable_irq();

    /* Initialize retarget-io to use the debug UART port */

    cy_retarget_io_init(CYBSP_DEBUG_UART_TX, CYBSP_DEBUG_UART_RX, CY_RETARGET_IO_BAUDRATE);

    cy_rslt_t rslt;

    cyhal_adc_t adc_obj;

    cyhal_adc_channel_t adc_chan_0_obj;

    /* ADC conversion result. */

    int32_t adc_out;

    /* Initialize ADC. The ADC block which can connect to pin 10[6] is selected */

    rslt = cyhal_adc_init(&adc_obj, P10_6, NULL);

    /* Initialize ADC channel, allocate channel number 0 to pin 10[0] as this is the first channel initialized */

    const cyhal_adc_channel_config_t channel_config = { .enable_averaging = false, .min_acquisition_ns = 220, .enabled = true };

    rslt = cyhal_adc_channel_init_diff(&adc_chan_0_obj, &adc_obj, P10_6, CYHAL_ADC_VNEG, &channel_config);

    /* Read the ADC conversion result for corresponding ADC channel. Repeat as necessary. */

    printf("adc start\n");

    adc_out = cyhal_adc_read(&adc_chan_0_obj);

    printf("adc=%ld\n", adc_out);

```

```

int32_t cyhal_adc_read(const cyhal_adc_channel_t *obj)

{

    uint32_t old_en_mask = 0u;

    if(!obj->adc->continuous_scanning)

    {

        /* Enable the selected channel only, then perform an on-demand conversion.

         * Save the old enabled channel set to restore after we're done */

        old_en_mask = SAR_CHAN_EN(obj->adc->base);

        Cy_SAR_SetChanMask(obj->adc->base, 1U << obj->channel_idx);

        obj->adc->conversion_complete = false;

        Cy_SAR_StartConvert(obj->adc->base, CY_SAR_START_CONVERT_SINGLE_SHOT);

    }

    /* Cy_SAR_IsEndConversion relies on and clears the EOS interrupt status bit.

     * We don't know how this read will be used in combination with interrupts,

     * so implement our own interrupt-driven EOS flag

     */

    while(!obj->adc->conversion_complete) { }

    int32_t result = Cy_SAR_GetResult32(obj->adc->base, obj->channel_idx);

    if(!obj->adc->continuous_scanning)

    {

        Cy_SAR_SetChanMask(obj->adc->base, old_en_mask);

    }

    return result;

}

```

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3 Replies
Vasanth
Moderator
Moderator

Hi,

I tried the same code in 062BLE kit and it seems to work. Let me check in the same hardware and get back to you.

Best Regards,
Vasanth

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NoKo_3612966
New Contributor

Hi,

Does it work with FreeRTOS, BLE and another timer interrupt?

If I miss some initialize code for ADC, please let me know.

Regards,

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Vasanth
Moderator
Moderator

Hi,

Ideally it is expected to work. Kindly check example code with HAL ADC (https://github.com/cypresssemiconductorco/mtb-example-psoc6-adc-basic). You can refer ADC initialization part from here.

Best Regards,
Vasanth

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