XADC內(nèi)嵌在PS端，允許CPU或其他主機連接XADC，而不用使用PL端。XADC最大采樣率為1MSPS，精度為12bits，內(nèi)置電壓和溫度傳感器，可監(jiān)測芯片的電壓及溫度信息。如圖所示電壓傳感器可監(jiān)測芯片的VCCINT,VCCAUX,VCCBRAM等，VP_0和VN_0為一對專用的ADC模擬輸入口。VAUXP[*]和VAUXN[*]也是ADC輸入口，但是不用作ADC輸入口時，可用作普通IO使用。

int XAdcPolledPrintfExample(u16 XAdcDeviceId)

{

int Status;

XAdcPs_Config *ConfigPtr;

u32 TempRawData;

u32 VccPintRawData;

u32 VccPauxRawData;

u32 VccPdroRawData;

float TempData;

float VccPintData;

float VccPauxData;

float MaxData;

float MinData;

XAdcPs *XAdcInstPtr = &XAdcInst;

printf(" Entering the XAdc PolledExample. ");

/*

* Initialize the XAdc driver.

*/

ConfigPtr= XAdcPs_LookupConfig(XAdcDeviceId);

if (ConfigPtr == NULL) {

return XST_FAILURE;

}

XAdcPs_CfgInitialize(XAdcInstPtr,ConfigPtr,

ConfigPtr->BaseAddress);

/*

* Self Test the XADC/ADC device

*/

Status= XAdcPs_SelfTest(XAdcInstPtr);

if (Status != XST_SUCCESS) {

return XST_FAILURE;

}

/*

* Disable the Channel Sequencer beforeconfiguring the Sequence

* registers.

*/

XAdcPs_SetSequencerMode(XAdcInstPtr,XADCPS_SEQ_MODE_SAFE);

/*

* Read the on-chip Temperature Data(Current/Maximum/Minimum)

* from the ADC data registers.

*/

TempRawData= XAdcPs_GetAdcData(XAdcInstPtr, XADCPS_CH_TEMP);

TempData= XAdcPs_RawToTemperature(TempRawData);

printf(" The Current Temperature is%0d.%03d Centigrades. ",

(int)(TempData), XAdcFractionToInt(TempData));

TempRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr, XADCPS_MAX_TEMP);

MaxData= XAdcPs_RawToTemperature(TempRawData);

printf("The Maximum Temperature is%0d.%03d Centigrades. ",

(int)(MaxData), XAdcFractionToInt(MaxData));

TempRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr, XADCPS_MIN_TEMP);

MinData= XAdcPs_RawToTemperature(TempRawData & 0xFFF0);

printf("The Minimum Temperature is%0d.%03d Centigrades. ",

(int)(MinData), XAdcFractionToInt(MinData));

/*

* Read the VccPint Votage Data(Current/Maximum/Minimum) from the

* ADC data registers.

*/

VccPintRawData= XAdcPs_GetAdcData(XAdcInstPtr, XADCPS_CH_VCCPINT);

VccPintData= XAdcPs_RawToVoltage(VccPintRawData);

printf(" The Current VCCPINT is%0d.%03d Volts. ",

(int)(VccPintData),XAdcFractionToInt(VccPintData));

VccPintRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr,

XADCPS_MAX_VCCPINT);

MaxData= XAdcPs_RawToVoltage(VccPintRawData);

printf("The Maximum VCCPINT is %0d.%03dVolts. ",

(int)(MaxData), XAdcFractionToInt(MaxData));

VccPintRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr,

XADCPS_MIN_VCCPINT);

MinData= XAdcPs_RawToVoltage(VccPintRawData);

printf("The Minimum VCCPINT is %0d.%03dVolts. ",

(int)(MinData), XAdcFractionToInt(MinData));

/*

* Read the VccPaux Votage Data(Current/Maximum/Minimum) from the

* ADC data registers.

*/

VccPauxRawData= XAdcPs_GetAdcData(XAdcInstPtr, XADCPS_CH_VCCPAUX);

VccPauxData= XAdcPs_RawToVoltage(VccPauxRawData);

printf(" The Current VCCPAUX is%0d.%03d Volts. ",

(int)(VccPauxData),XAdcFractionToInt(VccPauxData));

VccPauxRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr,

XADCPS_MAX_VCCPAUX);

MaxData= XAdcPs_RawToVoltage(VccPauxRawData);

printf("The Maximum VCCPAUX is %0d.%03dVolts. ",

(int)(MaxData), XAdcFractionToInt(MaxData));

VccPauxRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr,

XADCPS_MIN_VCCPAUX);

MinData= XAdcPs_RawToVoltage(VccPauxRawData);

printf("The Minimum VCCPAUX is %0d.%03dVolts. ",

(int)(MinData), XAdcFractionToInt(MinData));

/*

* Read the VccPdro Votage Data(Current/Maximum/Minimum) from the

* ADC data registers.

*/

VccPdroRawData= XAdcPs_GetAdcData(XAdcInstPtr, XADCPS_CH_VCCPDRO);

VccPintData= XAdcPs_RawToVoltage(VccPdroRawData);

printf(" The Current VCCPDDRO is%0d.%03d Volts. ",

(int)(VccPintData), XAdcFractionToInt(VccPintData));

VccPdroRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr,

XADCPS_MAX_VCCPDRO);

MaxData= XAdcPs_RawToVoltage(VccPdroRawData);

printf("The Maximum VCCPDDRO is %0d.%03dVolts. ",

(int)(MaxData), XAdcFractionToInt(MaxData));

VccPdroRawData= XAdcPs_GetMinMaxMeasurement(XAdcInstPtr,

XADCPS_MIN_VCCPDRO);

MinData= XAdcPs_RawToVoltage(VccPdroRawData);

printf("The Minimum VCCPDDRO is %0d.%03dVolts. ",

(int)(MinData), XAdcFractionToInt(MinData));

printf("Exiting the XAdc Polled Example. ");

return XST_SUCCESS;

}

/****************************************************************************/

/**

*

* This function converts the fractionpart of the given floating point number

* (after the decimal point)to aninteger.

*

* @param FloatNum is the floating point number.

*

* @return Integer number to a precision of 3 digits.

*

* @note

* This function is used in the printingof floating point data to a STDIO device

* using the xil_printf function. Thexil_printf is a very small foot-print

* printf function and does notsupport the printing of floating point numbers.

*

*****************************************************************************/

int XAdcFractionToInt(float FloatNum)

{

float Temp;

Temp= FloatNum;

if (FloatNum < 0) {

Temp= -(FloatNum);

}

return( ((int)((Temp -(float)((int)Temp)) * (1000.0f))));

}

原文標題：Zynq中PS端XADC