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zigbee协议栈里怎么使用cc2530adc？

yg wu
Prodigy 50 points

uint16 ReadLightData( void )
{
uint16 reading = 0;


HalAdcSetReference( HAL_ADC_REF_AVDD );
reading = HalAdcRead (HAL_ADC_CHANNEL_6 , HAL_ADC_RESOLUTION_12);
return reading;
}

char str[9];
uint16 value;

osal_memset(str, 0, 9);
value = ReadLightData();
sprintf(str, "%d ", value);

我接的是p0.6口，输出到串口后一直显示200，不管是接3.3v还是gnd都没变化。

请问怎么调用hal_adc里的uint16 HalAdcRead (uint8 channel, uint8 resolution)函数，该怎么配置才能采集到电压?

  • 0
    Intellectual 971 points

    你可能还没有使能IO的ADC功能，设置APCFG寄存器。

  • 0
    TI__Guru**** 188340 points

    参考这边的详细配置： http://blog.csdn.net/qq_15647227/article/details/53393253

  • 0 回复 gancheng
    Prodigy 50 points

    额，我去试试

  • 0 回复 Viki Shi
    Prodigy 50 points

    调用了下面的函数后还要配置那些东西才行啊？

    uint16 HalAdcRead (uint8 channel, uint8 resolution)
    {
    int16 reading = 0;

    #if (HAL_ADC == TRUE)
    uint8 i, resbits;
    uint8 adcChannel = 1;

    /*
    * If Analog input channel is AIN0..AIN7, make sure corresponing P0 I/O pin is enabled. The code
    * does NOT disable the pin at the end of this function. I think it is better to leave the pin
    * enabled because the results will be more accurate. Because of the inherent capacitance on the
    * pin, it takes time for the voltage on the pin to charge up to its steady-state level. If
    * HalAdcRead() has to turn on the pin for every conversion, the results may show a lower voltage
    * than actuality because the pin did not have time to fully charge.
    */
    if (channel < 8)
    {
    for (i=0; i < channel; i++)
    {
    adcChannel <<= 1;
    }
    }

    /* Enable channel */
    ADCCFG |= adcChannel;

    /* Convert resolution to decimation rate */
    switch (resolution)
    {
    case HAL_ADC_RESOLUTION_8:
    resbits = HAL_ADC_DEC_064;
    break;
    case HAL_ADC_RESOLUTION_10:
    resbits = HAL_ADC_DEC_128;
    break;
    case HAL_ADC_RESOLUTION_12:
    resbits = HAL_ADC_DEC_256;
    break;
    case HAL_ADC_RESOLUTION_14:
    default:
    resbits = HAL_ADC_DEC_512;
    break;
    }

    /* writing to this register starts the extra conversion */
    ADCCON3 = channel | resbits | adcRef;

    /* Wait for the conversion to be done */
    while (!(ADCCON1 & HAL_ADC_EOC));

    /* Disable channel after done conversion */
    ADCCFG &= (adcChannel ^ 0xFF);

    /* Read the result */
    reading = (int16) (ADCL);
    reading |= (int16) (ADCH << 8);

    /* Treat small negative as 0 */
    if (reading < 0)
    reading = 0;

    switch (resolution)
    {
    case HAL_ADC_RESOLUTION_8:
    reading >>= 8;
    break;
    case HAL_ADC_RESOLUTION_10:
    reading >>= 6;
    break;
    case HAL_ADC_RESOLUTION_12:
    reading >>= 4;
    break;
    case HAL_ADC_RESOLUTION_14:
    default:
    reading >>= 2;
    break;
    }
    #else
    // unused arguments
    (void) channel;
    (void) resolution;
    #endif

    return ((uint16)reading);
    }

  • 0 回复 yg wu
    Prodigy 50 points

    这两个我也配置了
    APCFG |= 0x40;
    P0SEL |= 0x40;