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芯旺微KF32A156芯片ADC配置

news 2025/7/10 5:34:31

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速时，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0ADC_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);}

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