MKV30如何使用ADC的差分模式

鹰宫璞爱惟

MKV30这款芯片支不支持ADC的差分输入，例程中没有，如果有，如何配置成差分模式呢

最佳答案

https://www.nxpic.org.cn/module/ ... =%E5%B7%AE%E5%88%86

• 小恩GG
• 发表于2020-11-13
• 详细答案>>

阅读全文

小恩GG

https://www.nxpic.org.cn/module/ ... =%E5%B7%AE%E5%88%86

鹰宫璞爱惟

小恩GG 发表于 2020-11-13 08:51
https://www.nxpic.org.cn/module/forum/forum.php?mod=viewthread&tid=614978&highlight=%E5%B7%AE%E5%88% ...

借鉴了链接的代码。和我的没啥区别，但是没有效果。咋回事


#include "ADC.h"
/***********************************************************************************************************************
* BOARD_InitPeripherals functional group
**********************************************************************************************************************/
#define ADC16_RESULT_REG_ADDR    0x4003b010U
#define DEMO_ADC16_SAMPLE_COUNT 16U /* The ADC16 sample count. */

volatile bool g_Transfer_Done = false; /* DMA transfer completion flag. */
edma_transfer_config_t g_transferConfig;
uint32_t g_adc16SampleDataArray[DEMO_ADC16_SAMPLE_COUNT];
/***********************************************************************************************************************
* DMA initialization code
**********************************************************************************************************************/

static void Edma_Callback(edma_handle_t *handle, void *userData, bool transferDone, uint32_t tcds)
{
    /* Clear Edma interrupt flag. */
    EDMA_ClearChannelStatusFlags(DMA_DMA_BASEADDR, DMA_CH1_DMA_CHANNEL, kEDMA_InterruptFlag);
    /* Setup transfer */
    EDMA_PrepareTransfer(&g_transferConfig, (void *)ADC16_RESULT_REG_ADDR, sizeof(uint32_t),
                         (void *)g_adc16SampleDataArray, sizeof(uint32_t), sizeof(uint32_t),
                         sizeof(g_adc16SampleDataArray), kEDMA_PeripheralToMemory);
    EDMA_SetTransferConfig(DMA_DMA_BASEADDR, DMA_CH1_DMA_CHANNEL, &g_transferConfig, NULL);
    /* Enable transfer. */
    EDMA_StartTransfer(&DMA_CH1_Handle);
    g_Transfer_Done = true;
}

const edma_config_t DMA_config = {
  .enableContinuousLinkMode = false,
  .enableHaltOnError = false,
  .enableRoundRobinArbitration = false,
  .enableDebugMode = false
};
edma_handle_t DMA_CH1_Handle;
edma_handle_t DMA_CH2_Handle;

void ADC_DMA_init(void) {

  /* Channel CH1 initialization */
  /* Set the source kDmaRequestMux0ADC0 request in the DMAMUX */
  DMAMUX_SetSource(DMA_DMAMUX_BASEADDR, DMA_CH1_DMA_CHANNEL, DMA_CH1_DMA_REQUEST);
  /* Enable the channel 1 in the DMAMUX */
  DMAMUX_EnableChannel(DMA_DMAMUX_BASEADDR, DMA_CH1_DMA_CHANNEL);
  /* Create the eDMA DMA_CH1_Handle handle */
  EDMA_CreateHandle(&DMA_CH1_Handle, DMA_DMA_BASEADDR, DMA_CH1_DMA_CHANNEL);

  /* Channel CH2 initialization */
  /* Set the source kDmaRequestMux0ADC1 request in the DMAMUX */
  DMAMUX_SetSource(DMA_DMAMUX_BASEADDR, DMA_CH2_DMA_CHANNEL, DMA_CH2_DMA_REQUEST);
  /* Enable the channel 2 in the DMAMUX */
  DMAMUX_EnableChannel(DMA_DMAMUX_BASEADDR, DMA_CH2_DMA_CHANNEL);
  /* Create the eDMA DMA_CH2_Handle handle */
  EDMA_CreateHandle(&DMA_CH2_Handle, DMA_DMA_BASEADDR, DMA_CH2_DMA_CHANNEL);
}
void EDMA_Configuration(void)
{
        edma_config_t userConfig;

    EDMA_GetDefaultConfig(&userConfig);
    EDMA_Init(DMA_DMA_BASEADDR, &DMA_config);
    EDMA_CreateHandle(&DMA_CH1_Handle, DMA_DMA_BASEADDR, DMA_CH1_DMA_CHANNEL);
    EDMA_SetCallback(&DMA_CH1_Handle, Edma_Callback, NULL);
    EDMA_PrepareTransfer(&g_transferConfig, (void *)ADC16_RESULT_REG_ADDR, sizeof(uint32_t),
                         (void *)g_adc16SampleDataArray, sizeof(uint32_t), sizeof(uint32_t),
                         sizeof(g_adc16SampleDataArray), kEDMA_PeripheralToMemory);
    EDMA_SubmitTransfer(&DMA_CH1_Handle, &g_transferConfig);
    /* Enable interrupt when transfer is done. */
    EDMA_EnableChannelInterrupts(DMA_DMA_BASEADDR, DMA_CH1_DMA_CHANNEL, kEDMA_MajorInterruptEnable);
#if defined(FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT) && FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT
    /* Enable async DMA request. */
    EDMA_EnableAsyncRequest(DMA_DMA_BASEADDR, DMA_CH1_DMA_CHANNEL, true);
#endif /* FSL_FEATURE_EDMA_ASYNCHRO_REQUEST_CHANNEL_COUNT */
    /* Enable transfer. */
    EDMA_StartTransfer(&DMA_CH1_Handle);
}
/***********************************************************************************************************************
* ADC0 initialization code
**********************************************************************************************************************/

adc16_channel_config_t ADC0_channelsConfig[1] = {
  {
    .channelNumber = 1U,
    .enableDifferentialConversion = false,
    .enableInterruptOnConversionCompleted = false,
  }
};
const adc16_config_t ADC0_config = {
  .referenceVoltageSource = kADC16_ReferenceVoltageSourceVref,
  .clockSource = kADC16_ClockSourceAsynchronousClock,
  .enableAsynchronousClock = true,
  .clockDivider = kADC16_ClockDivider8,
  .resolution = kADC16_ResolutionSE16Bit,
  .longSampleMode = kADC16_LongSampleDisabled,
  .enableHighSpeed = false,
  .enableLowPower = false,
  .enableContinuousConversion = true
};
const adc16_channel_mux_mode_t ADC0_muxMode = kADC16_ChannelMuxA;
const adc16_hardware_average_mode_t ADC0_hardwareAverageMode = kADC16_HardwareAverageCount8;

void ADC0_init(void) {
  /* Initialize ADC16 converter */
  ADC16_Init(ADC0_PERIPHERAL, &ADC0_config);
  /* Make sure, that software trigger is used */
  ADC16_EnableHardwareTrigger(ADC0_PERIPHERAL, false);
  /* Configure hardware average mode */
  ADC16_SetHardwareAverage(ADC0_PERIPHERAL, ADC0_hardwareAverageMode);
  /* Configure channel multiplexing mode */
  ADC16_SetChannelMuxMode(ADC0_PERIPHERAL, ADC0_muxMode);
  /* Initialize channel */
  ADC16_SetChannelConfig(ADC0_PERIPHERAL, 0U, &ADC0_channelsConfig[0]);
  /* Enable DMA. */
  ADC16_EnableDMA(ADC0_PERIPHERAL, true);
}

/***********************************************************************************************************************
* ADC1 initialization code
**********************************************************************************************************************/

adc16_channel_config_t ADC1_channelsConfig[1] = {
  {
    .channelNumber = 1U,
    .enableDifferentialConversion = true,
    .enableInterruptOnConversionCompleted = false,
  }
};
const adc16_config_t ADC1_config = {
  .referenceVoltageSource = kADC16_ReferenceVoltageSourceVref,
  .clockSource = kADC16_ClockSourceAsynchronousClock,
  .enableAsynchronousClock = true,
  .clockDivider = kADC16_ClockDivider8,
  .resolution = kADC16_ResolutionSE16Bit,
  .longSampleMode = kADC16_LongSampleDisabled,
  .enableHighSpeed = false,
  .enableLowPower = false,
  .enableContinuousConversion = false
};
const adc16_channel_mux_mode_t ADC1_muxMode = kADC16_ChannelMuxA;
const adc16_hardware_average_mode_t ADC1_hardwareAverageMode = kADC16_HardwareAverageDisabled;

void ADC1_init(void) {
  /* Initialize ADC16 converter */
  ADC16_Init(ADC1_PERIPHERAL, &ADC1_config);
  /* Make sure, that software trigger is used */
  ADC16_EnableHardwareTrigger(ADC1_PERIPHERAL, false);
  /* Configure hardware average mode */
  ADC16_SetHardwareAverage(ADC1_PERIPHERAL, ADC1_hardwareAverageMode);
  /* Configure channel multiplexing mode */
  ADC16_SetChannelMuxMode(ADC1_PERIPHERAL, ADC1_muxMode);
  /* Initialize channel */
  ADC16_SetChannelConfig(ADC1_PERIPHERAL, 0U, &ADC1_channelsConfig[0]);
   /* Enable DMA. */
   ADC16_EnableDMA(ADC1_PERIPHERAL, true);       

}
uint32_t ADC_Value = 0;

void DifferentialSample_DC(void)
{
      
      
        while (0U == (kADC16_ChannelConversionDoneFlag & ADC16_GetChannelStatusFlags(ADC0, 0)))
        {
        }
        ADC_Value = ADC16_GetChannelConversionValue(ADC0, 0);
        ADC_Value = ADC_Value*3000/4095;
     

}
/***********************************************************************************************************************
* Initialization functions
**********************************************************************************************************************/
void ADC_InitPeripherals(void)
{
  /* Global initialization */
  DMAMUX_Init(DMAMUX);
  EDMA_Init(DMA_DMA_BASEADDR, &DMA_config);
  EDMA_Configuration();
  /* Initialize components */
  ADC_DMA_init();
  ADC0_init();
  ADC1_init();
        DifferentialSample_DC();
}

/***********************************************************************************************************************
* BOARD_InitBootPeripherals function
**********************************************************************************************************************/
void ADC_InitBootPeripherals(void)
{
  ADC_InitPeripherals();
}

鹰宫璞爱惟

小恩GG 发表于 2020-11-13 08:51
https://www.nxpic.org.cn/module/forum/forum.php?mod=viewthread&tid=614978&highlight=%E5%B7%AE%E5%88% ...

我现在使用SDK里面的例程移植过来，可以采集出AD，但是16个大小的数组，只有第一个有数据其他都是0