Zedboard学习（六）：XADC读取数据

zynq 的内嵌了 XADC，可以用来采集电压；

Temp：芯片温度
VCCINT： 内部PL核心电压
VCCAUX： 辅助PL电压
VCCBram： PL BRAM电压
VCCPInt： PS内部核心电压
VCCPAux： PS辅助电压
VCCDDR： DDR RAM的工作电压
VREFP： XADC正参考电压
VREFN： XADC负参考电压

1、新建工程，添加block design。添加zynq7 processor和xadc模块。

2、Run Block Automation后会自动配置zynq7处理器；Run Connection Automation 会自动将模块进行连接，将xadc模块挂载在axi总线下，这样xadc的相关寄存器会映射到处理器的内存（DDR）上。自动添加的两个模块，一个用于管理全局复位，一个用于同步axi总线。

点击 自动重新对整个block design布局。

3、保存并生成顶层头文件。

4、生成比特流文件，等会儿就生成好了。

5、导出比特流，打开sdk。sdk下新建工程，输入如下代码：

/* * main.c * *  Created on: 2017年7月16日 *      Author: XHB */#include <stdio.h>#include "xparameters.h"#include "xadcps.h"#include "xil_types.h"#include "xadcps_hw.h"#include "sleep.h"int main(){    static XAdcPs Adc_Struct;    XAdcPs_Config *Adc_Config;    int xStatus;    //temperature readings    u32 TempRawData;    float TempData;    //Vcc Int readings    u32 VccIntRawData;    float VccIntData;    //Vcc Aux readings    u32 VccAuxRawData;    float VccAuxData;    //Vbram readings    u32 VBramRawData;    float VBramData;    //VccPInt readings    u32 VccPIntRawData;    float VccPIntData;    //VccPAux readings    u32 VccPAuxRawData;    float VccPAuxData;    //Vddr readings    u32 VDDRRawData;    float VDDRData;    Adc_Config = XAdcPs_LookupConfig(XPAR_PS7_XADC_0_DEVICE_ID);    if(Adc_Config == NULL)    {        print("error to look up config!!!\n");        return XST_FAILURE;    }    xStatus = XAdcPs_CfgInitialize(&Adc_Struct, Adc_Config, Adc_Config->BaseAddress);    if(xStatus != XST_SUCCESS)    {        print("error to initialize!!!\n");        return XST_FAILURE;    }    xStatus = XAdcPs_SelfTest(&Adc_Struct);    if(xStatus != XST_SUCCESS)    {        print("error to Self Test!!!\n");        return XST_FAILURE;    }    //设置采样模式    XAdcPs_SetSequencerMode(&Adc_Struct, XADCPS_SEQ_MODE_SINGCHAN);    //设置报警使能，直接关闭掉    XAdcPs_SetAlarmEnables(&Adc_Struct, 0x0);    //设置使能采样通道    XAdcPs_SetSeqChEnables(&Adc_Struct, XADCPS_CH_TEMP|XADCPS_CH_VCCINT|XADCPS_CH_VCCAUX|XADCPS_CH_VBRAM|XADCPS_CH_VCCPINT| XADCPS_CH_VCCPAUX|XADCPS_CH_VCCPDRO);    while(1)    {        TempRawData = XAdcPs_GetAdcData(&Adc_Struct, XADCPS_CH_TEMP);        TempData = XAdcPs_RawToTemperature(TempRawData);        printf("Raw Temp %lu Real Temp %f \n", TempRawData, TempData);        VccIntRawData= XAdcPs_GetAdcData(&Adc_Struct, XADCPS_CH_VCCINT);        VccIntData = XAdcPs_RawToVoltage(VccIntRawData);        printf("Raw VccInt %lu Real VccInt %f \n", VccIntRawData,VccIntData);        VccAuxRawData = XAdcPs_GetAdcData(&Adc_Struct, XADCPS_CH_VCCAUX);        VccAuxData = XAdcPs_RawToVoltage(VccAuxRawData);        printf("Raw VccAux %lu Real VccAux %f \n", VccAuxRawData,VccAuxData);        VBramRawData = XAdcPs_GetAdcData(&Adc_Struct, XADCPS_CH_VBRAM);        VBramData = XAdcPs_RawToVoltage(VBramRawData);        printf("Raw VccBram %lu Real VccBram %f \n", VBramRawData, VBramData);        VccPIntRawData = XAdcPs_GetAdcData(&Adc_Struct, XADCPS_CH_VCCPINT);        VccPIntData = XAdcPs_RawToVoltage(VccPIntRawData);        printf("Raw VccPInt %lu Real VccPInt %f \n", VccPIntRawData, VccPIntData);        VccPAuxRawData = XAdcPs_GetAdcData(&Adc_Struct, XADCPS_CH_VCCPAUX);        VccPAuxData = XAdcPs_RawToVoltage(VccPAuxRawData);        printf("Raw VccPAux %lu Real VccPAux %f \n", VccPAuxRawData, VccPAuxData);        VDDRRawData = XAdcPs_GetAdcData(&Adc_Struct, XADCPS_CH_VCCPDRO);        VDDRData = XAdcPs_RawToVoltage(VDDRRawData);        printf("Raw VccDDR %lu Real VccDDR %f \n", VDDRRawData, VDDRData);        sleep(1);    }    return 0;}

头文件：

#include "xparameters.h"//定义了相关的硬件设备的参数，如设备ID、基地址等#include "xadcps.h"//定义了与操作xadc相关的库函数和结构体

结构体：
XAdcPs_Config结构体：存放与XADC/ADC有关的初始化信息。

typedef struct {    u16  DeviceId;      /**< Unique ID of device */    u32  BaseAddress;   /**< Device base address */} XAdcPs_Config;

XAdcPs结构体：库函数在对ADC操作时所使用的结构体。

typedef struct {    XAdcPs_Config Config;   /**< XAdcPs_Config of current device */    u32  IsReady;       /**< Device is initialized and ready  */} XAdcPs;

库函数：
a、通过设备ID号，返回定义有相关信息的XAdcPs_Config结构体；

XAdcPs_Config *XAdcPs_LookupConfig(u16 DeviceId)

b、初始化ADC；

int XAdcPs_CfgInitialize(XAdcPs *InstancePtr, XAdcPs_Config *ConfigPtr,u32 EffectiveAddr)

c、自测，就是字面意思；

int XAdcPs_SelfTest(XAdcPs *InstancePtr)

d、设置采样模式；

void XAdcPs_SetSequencerMode(XAdcPs *InstancePtr, u8 SequencerMode)

采样模式有以下几种：

- Default safe mode (XADCPS_SEQ_MODE_SAFE)- One pass through sequence (XADCPS_SEQ_MODE_ONEPASS)- Continuous channel sequencing (XADCPS_SEQ_MODE_CONTINPASS)- Single Channel/Sequencer off (XADCPS_SEQ_MODE_SINGCHAN)- Simulataneous sampling mode (XADCPS_SEQ_MODE_SIMUL_SAMPLING)- Independent mode (XADCPS_SEQ_MODE_INDEPENDENT)

e、设置报警模式，关掉就行了；

void XAdcPs_SetAlarmEnables(XAdcPs *InstancePtr, u16 AlmEnableMask)

掩码AlmEnableMask填0，屏蔽掉了所有位。

f、使能采样通道。

int XAdcPs_SetSeqChEnables(XAdcPs *InstancePtr, u32 ChEnableMask)

通道如下：

#define XADCPS_CH_TEMP      0x0  /**< On Chip Temperature */#define XADCPS_CH_VCCINT    0x1  /**< VCCINT */#define XADCPS_CH_VCCAUX    0x2  /**< VCCAUX */#define XADCPS_CH_VPVN      0x3  /**< VP/VN Dedicated analog inputs */#define XADCPS_CH_VREFP     0x4  /**< VREFP */#define XADCPS_CH_VREFN     0x5  /**< VREFN */#define XADCPS_CH_VBRAM     0x6  /**< On-chip VBRAM Data Reg, 7 series */#define XADCPS_CH_SUPPLY_CALIB  0x07 /**< Supply Calib Data Reg */#define XADCPS_CH_ADC_CALIB 0x08 /**< ADC Offset Channel Reg */#define XADCPS_CH_GAINERR_CALIB 0x09 /**< Gain Error Channel Reg  */#define XADCPS_CH_VCCPINT   0x0D /**< On-chip PS VCCPINT Channel , Zynq */#define XADCPS_CH_VCCPAUX   0x0E /**< On-chip PS VCCPAUX Channel , Zynq */#define XADCPS_CH_VCCPDRO   0x0F /**< On-chip PS VCCPDRO Channel , Zynq */#define XADCPS_CH_AUX_MIN    16 /**< Channel number for 1st Aux Channel */#define XADCPS_CH_AUX_MAX    31 /**< Channel number for Last Aux channel */

6、先下载比特流文件配置硬件，后在sdk中run程序。
运行结果：