芯旺微KF32A156芯片ADC配置

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已于 2024-12-24 13:16:31 修改

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分类专栏：芯片文章标签：单片机

于 2024-12-19 21:30:00 首次发布

本文链接：https://blog.youkuaiyun.com/u012568663/article/details/144588041

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使用芯旺微KF32A156的芯片做预研项目，使用了ADC0外设，根据芯片规格书中的描述进行了配置：

/**
 * @brief: Configure ADC.
 *
 *  @param[in]  none.
 *  @param[in]  none.
 *  @param[out] None
 * @retval: None
 */
static void adc_peripheral_init(void) {
  ADC_InitTypeDef ADC_InitStructure;

  ADC_Reset(ADC0_SFR);

  ADC_InitStructure.m_Clock = ADC_HFCLK;
  ADC_InitStructure.m_ClockDiv = ADC_CLK_DIV_2;
  ADC_InitStructure.m_ScanMode = TRUE;
  ADC_InitStructure.m_ContinuousMode = ADC_SINGLE_MODE;
  ADC_InitStructure.m_DataAlign = ADC_DATAALIGN_RIGHT;
  ADC_InitStructure.m_ExternalTrig_EN = TRUE;
  ADC_InitStructure.m_HPExternalTrig_EN = FALSE;
  ADC_InitStructure.m_ExternalTrig = ADC_EXTERNALTRIG_T1TRGO;
  ADC_InitStructure.m_VoltageRef = ADC_REF_AVDD;
  ADC_InitStructure.m_NumOfConv = ADC_CH_NUM_MAX;
  ADC_InitStructure.m_NumOfHPConv = 0;
  ADC_Configuration(ADC0_SFR, &ADC_InitStructure);

  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_14, 0x01);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_15, 0x02);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_58, 0x03);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_60, 0x04);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_68, 0x05);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_69, 0x06);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_70, 0x07);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_72, 0x08);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_76, 0x09);
  ADC_Regular_Channel_DMA_Cmd(ADC0_SFR, TRUE);
  ADC_Cmd(ADC0_SFR, TRUE);

  /* 使能AD 后，延迟大概5us 后，再去给触发信号去触发AD 转换 */
  systick_delay_ms(1);

}

发现采样结果一直异常，之后进入到初始化配置函数，发现如下代码：

    /*---------------- 设置ADC_HSCANSQ寄存器 ----------------*/
    /* 根据结构体成员m_NumOfHPConv，设置HSLEN位域 */
    tmpreg = (adcInitStruct->m_NumOfHPConv - 1) << ADC_SCANCTL_HSLEN0_POS;
    ADCx->SCANCTL = SFR_Config (ADCx->SCANCTL,~ADC_SCANCTL_HSLEN,tmpreg);

这是高级转换通道的数量，因为不使用，所以配置了0，但是这里进行了减1的操作， tmpreg是uint32_t 类型的，tmpreg十六进制数就是0xFFFFFFF0，而SFR_Config的定义如下：

/* 写特殊功能寄存器 */
static inline uint32_t SFR_Config(uint32_t SfrMem, uint32_t SfrMask, uint32_t WriteVal)
{
    return ((SfrMem & SfrMask) | (WriteVal));
}

所以不使能高优先级通道转换时，m_NumOfHPConv 不能配置为0，需要配置为1；正确配置如下：

/**
 * @brief: Configure ADC.
 *
 *  @param[in]  none.
 *  @param[in]  none.
 *  @param[out] None
 * @retval: None
 */
static void adc_peripheral_init(void) {
  ADC_InitTypeDef ADC_InitStructure;

  ADC_Reset(ADC0_SFR);

  ADC_InitStructure.m_Clock = ADC_HFCLK;
  ADC_InitStructure.m_ClockDiv = ADC_CLK_DIV_2;
  ADC_InitStructure.m_ScanMode = TRUE;
  ADC_InitStructure.m_ContinuousMode = ADC_SINGLE_MODE;
  ADC_InitStructure.m_DataAlign = ADC_DATAALIGN_RIGHT;
  ADC_InitStructure.m_ExternalTrig_EN = TRUE;
  ADC_InitStructure.m_HPExternalTrig_EN = FALSE;
  ADC_InitStructure.m_ExternalTrig = ADC_EXTERNALTRIG_T1TRGO;
  ADC_InitStructure.m_VoltageRef = ADC_REF_AVDD;
  ADC_InitStructure.m_NumOfConv = ADC_CH_NUM_MAX;
  ADC_InitStructure.m_NumOfHPConv = 1;//不能为0
  ADC_Configuration(ADC0_SFR, &ADC_InitStructure);

  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_14, 0x01);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_15, 0x02);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_58, 0x03);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_60, 0x04);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_68, 0x05);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_69, 0x06);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_70, 0x07);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_72, 0x08);
  ADC_Regular_Channel_Config(ADC0_SFR, ADC_CHANNEL_76, 0x09);
  ADC_Regular_Channel_DMA_Cmd(ADC0_SFR, TRUE);
  ADC_Cmd(ADC0_SFR, TRUE);

  /* 使能AD 后，延迟大概5us 后，再去给触发信号去触发AD 转换 */
  systick_delay_ms(1);

}