CC2640R2F: SDKv5.30: adcbufcontinuous example program does not continuously sample the ADC?

Part Number: CC2640R2F

Tool/software:

Hi,

I am using SDKv5.30 adcbufcontinuous drivers example program. I modified the adcBufCallback() to copy the contents completedADCBuffer[] to rawadcbuffer[]. See code change below.

void adcBufCallback(ADCBuf_Handle handle, ADCBuf_Conversion *conversion,
    void *completedADCBuffer, uint32_t completedChannel)
{
    uint_fast16_t i;
    uint_fast16_t uartTxBufferOffset = 0;

    memcpy(rawadcbuffer, completedADCBuffer, ADCBUFFERSIZE);
    /* Adjust raw ADC values and convert them to microvolts */
    ADCBuf_adjustRawValues(handle, completedADCBuffer, 2*ADCBUFFERSIZE,
        completedChannel);
    memcpy(rawadcbuffer, completedADCBuffer, ADCBUFFERSIZE);
    ADCBuf_convertAdjustedToMicroVolts(handle, completedChannel,
        completedADCBuffer, microVoltBuffer, ADCBUFFERSIZE);

    /* Start with a header message. */
    uartTxBufferOffset = snprintf(uartTxBuffer,
        UARTBUFFERSIZE - uartTxBufferOffset, "\r\nBuffer %u finished.",
        (unsigned int)buffersCompletedCounter++);

    /* Write raw adjusted values to the UART buffer if there is room. */
    uartTxBufferOffset += snprintf(uartTxBuffer + uartTxBufferOffset,
        UARTBUFFERSIZE - uartTxBufferOffset, "\r\nRaw Buffer: ");

    for (i = 0; i < ADCBUFFERSIZE && uartTxBufferOffset < UARTBUFFERSIZE; i++) {
        uartTxBufferOffset += snprintf(uartTxBuffer + uartTxBufferOffset,
            UARTBUFFERSIZE - uartTxBufferOffset, "%u,",
        *(((uint16_t *)completedADCBuffer) + i));
    }

    /* Write microvolt values to the UART buffer if there is room. */
    if (uartTxBufferOffset < UARTBUFFERSIZE) {
        uartTxBufferOffset += snprintf(uartTxBuffer + uartTxBufferOffset,
            UARTBUFFERSIZE - uartTxBufferOffset, "\r\nMicrovolts: ");

        for (i = 0; i < ADCBUFFERSIZE && uartTxBufferOffset < UARTBUFFERSIZE; i++) {
            uartTxBufferOffset += snprintf(uartTxBuffer + uartTxBufferOffset,
                UARTBUFFERSIZE - uartTxBufferOffset, "%u,",
                (unsigned int)microVoltBuffer[i]);
        }
    }

    /*
     * Ensure we don't write outside the buffer.
     * Append a newline after the data.
     */
    if (uartTxBufferOffset < UARTBUFFERSIZE) {
        uartTxBuffer[uartTxBufferOffset++] = '\n';
    }
    else {
        uartTxBuffer[UARTBUFFERSIZE-1] = '\n';
    }

    /* Display the data via UART */
    UART_write(uart, uartTxBuffer, uartTxBufferOffset);
}

Here is the rawadcbuffer[]. There are a lot of zeroes. Only 25 ADC readings out of 100.

-kel