IWR1843BOOST: Non-blocking ADC readings

Javier Fernandez

Part Number: IWR1843BOOST

Hello,

I have to read the temperature from a NTC sensor connected to GPADC_1. Reviewing the SDK I see that is implemented blocking and non-blocking methods. However, I do not know how to use them. As it is said in the documentation:

There are a callbackFxn and a returnMode to do it in non-block way. However, my ADCBuf_Params does not have those variables:

I am using mmwave_sdk_03_05_00_04 version on iwr18xx EVK. How can I implement in non-blocking way?

If it is not possible, Which is the better approach to do it? How can I retrieve the readings?

Best regards,

Javier

over 3 years ago

+1 Alec May over 3 years ago

TI__Genius 17265 points

Hi,

If you are trying to read the GPADC's, I would recommend following the advice in this thread:
https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/910986/faq-faq-hardware-queries-related-to-mmwave-devices

And use the MmwaveLink_setGpAdcConfig function from the mmwavelink control layer, and then look for the Async event RL_RF_AE_GPADC_MEAS_DATA_SB in your main file (you should be able to find the Aync Event handler in MSS_Main.c or equivalent file)

Best Regards,
Alec

0 Javier Fernandez over 3 years ago in reply to Alec May

Prodigy 152 points

Hi Alec,

Many thanks for the recommendation, it is working as expected. I can share my configuration:

const rlGpAdcCfg_t gpAdcCfg =
{
 .enable = 0x01,
 .bufferEnable = 0x01,
 .numOfSamples[0].sampleCnt = 14,
 .numOfSamples[0].settlingTime = 3,
 .numOfSamples[1].sampleCnt = 20,
 .numOfSamples[1].settlingTime = 3,
 .numOfSamples[2].sampleCnt = 14,
 .numOfSamples[2].settlingTime = 3,
 .numOfSamples[3].sampleCnt = 14,
 .numOfSamples[3].settlingTime = 3,
 .numOfSamples[4].sampleCnt = 14,
 .numOfSamples[4].settlingTime = 3,
 .numOfSamples[5].sampleCnt = 14,
 .numOfSamples[5].settlingTime = 3,
 .reserved0 = 0,
 .reserved1[0] = 0,
 .reserved1[1] = 0,
 .reserved1[2] = 0
};

And then I just create a task with the following code:

    while (1)
    {
        Semaphore_pend(mAdcReadSemHandle, BIOS_WAIT_FOREVER);

        int32_t         retVal;

        /* Set GPADC configuration */
        retVal = rlSetGpAdcConfig(RL_DEVICE_MAP_INTERNAL_BSS, (rlGpAdcCfg_t*)&gpAdcCfg);

        /* Check for mmWaveLink API call status */
        if(retVal != 0)
        {
            /* Error: Link reported an issue. */
            System_printf("Error: rlSetGpAdcConfig retVal=%d\n", retVal);
        }

        Task_sleep(1);
    }

And read the value as follow:

        case RL_RF_AE_GPADC_MEAS_DATA_SB:
        {
            System_printf ("!!!!GPADC DATA!!!! \n");
            memcpy(&rcvGpAdcData, payload, sizeof(rlRecvdGpAdcData_t));
            uint16_t adc_val = rcvGpAdcData.sensor[RL_SENSOR_ANALOGTEST_ONE].avg;

Best regards,

Javier

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IWR1843BOOST: Non-blocking ADC readings