Digilent提供的Pmod AD5驱动程序
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- examples里的main.c
/******************************************************************************/
/* */
/* main.c -- Example program using the PmodAD5 IP */
/* */
/******************************************************************************/
/* Author: Jon Peyron */
/* */
/******************************************************************************/
/* File Description: */
/* */
/* This demo continuously reads analog data from the PmodAD5 converts it into */
/* digital data. Then it converts the digital data into voltage and prints */
/* the value through uart to a serial terminal */
/* */
/******************************************************************************/
/* Revision History: */
/* */
/* 12/19/17(JPEYRON): Created */
/* */
/******************************************************************************/
/************ Include Files ************/
#include "PmodAD5.h"
#include "sleep.h"
#include "xil_cache.h"
#include <stdio.h>
#include "xparameters.h"
/************ Macro Definitions ************/
/************ Function Prototypes ************/
void DemoInitialize();
void DemoRun();
void DemoCleanup();
void EnableCaches();
void DisableCaches();
/************ Global Variables ************/
PmodAD5 myDevice;
/************ Function Definitions ************/
int main(void) {
DemoInitialize();
DemoRun();
DemoCleanup();
return 0;
}
void DemoInitialize() {
EnableCaches();
AD5_begin(&myDevice, XPAR_PMODAD5_0_AXI_LITE_SPI_BASEADDR);
}
void DemoRun() {
xil_printf("starting...\\n\\r");
while (1) {
float voltage= 0;
AD5_readData(&myDevice);
voltage = AD5_DataToVoltage(&myDevice);
printf("Voltage is: %lf \\n\\r", voltage); // format text for display
sleep(10);
}
}
void DemoCleanup() {
AD5_end(&myDevice);
DisableCaches();
}
void EnableCaches() {
#ifdef __MICROBLAZE__
#ifdef XPAR_MICROBLAZE_USE_DCACHE
Xil_DCacheEnable();
#endif
#ifdef XPAR_MICROBLAZE_USE_ICACHE
Xil_ICacheEnable();
#endif
#endif
}
void DisableCaches() {
#ifdef __MICROBLAZE__
#ifdef XPAR_MICROBLAZE_USE_DCACHE
Xil_DCacheDisable();
#endif
#ifdef XPAR_MICROBLAZE_USE_ICACHE
Xil_ICacheDisable();
#endif
#endif
}
- src里的PmodAD5.c
/*************************************************************************/
/* */
/* PmodAD5.c -- PmodAD5 Driver Source */
/* */
/*************************************************************************/
/* Author: Jon Peyron */
/* Copyright 2017, Digilent Inc. */
/*************************************************************************/
/* Module Description: */
/* */
/* This file contains source code for the PmodAD5 driver */
/* */
/*************************************************************************/
/* Revision History: */
/* */
/* 12/19/2017(JPEYRON): Created */
/* */
/*************************************************************************/
/***************************** Include Files *******************************/
#include "PmodAD5.h"
/************************** Function Definitions ***************************/
XSpi_Config AD5Config =
{
0,
0,
1,
0,
1,
8,
0,
0,
0,
0,
0
};
/* ------------------------------------------------------------ */
/*** void AD1_begin(PmodAD5* InstancePtr, u32 BaseAddress)
**
** Parameters:
** InstancePtr: A PmodAD5 object to start
** BaseAddress: The base address of the PmodAD5 AXI_LITE_SAMPLE interface
**
** Description:
** Initialize the PmodAD5 device - note that the AD5 IP is free-running, and this function just prepares the driver for use.
** Also calls AD5_WriteConfig which configures the AD5 for a gain of 1 and set to differential.
*/
void AD5_begin(PmodAD5* InstancePtr, u32 SPI_Address)
{
AD5Config.BaseAddress = SPI_Address;
AD5_SPIInit(&InstancePtr->AD5Spi);
AD5_WriteConfig(InstancePtr);
}
/* ------------------------------------------------------------ */
/*** AD5_end(void)
**
** Parameters:
** InstancePtr - PmodAd5 object to stop
**
** Return Value:
** none
**
** Errors:
** none
**
** Description:
** Stops the device
*/
void AD5_end(PmodAD5* InstancePtr) {
XSpi_Stop(&InstancePtr->AD5Spi);
}
/* ------------------------------------------------------------ */
/*** AD5_SPIInit
**
** Parameters:
** none
**
** Return Value:
** none
**
** Errors:
** none
**
** Description:
** Initializes the PmodAD5 SPI.
*/
int AD5_SPIInit(XSpi *SpiInstancePtr) {
int Status;
Status = XSpi_CfgInitialize(SpiInstancePtr, &AD5Config,
AD5Config.BaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
Status = XSpi_SetOptions(SpiInstancePtr, (XSP_MASTER_OPTION
| XSP_CLK_ACTIVE_LOW_OPTION | XSP_CLK_PHASE_1_OPTION)
| XSP_MANUAL_SSELECT_OPTION);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
Status = XSpi_SetSlaveSelect(SpiInstancePtr, 1);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Start the SPI driver so that the device is enabled.
*/
XSpi_Start(SpiInstancePtr);
/*
* Disable Global interrupt to use polled mode operation
*/
XSpi_IntrGlobalDisable(SpiInstancePtr);
return XST_SUCCESS;
}
/* ------------------------------------------------------------ */
/*** AD5_readData
**
** Synopsis:
** AD5_readData(PmodAD5* InstancePtr);
**
** Parameters:
** PmodAD5* InstancePtr - the PmodAD5 object to communicate with
**
** Return Value:
** none
**
** Errors:
** none
**
** Description:
** Reads data in through SPI. It sends the first byte to the communication register which sets communication to read for
** the next 3 bytes.
** Data is stored into data1, data2 and data3.
*/
void AD5_readData(PmodAD5* InstancePtr) {
u8 bytes[4];
bytes[0]= 0x58; //first byte is sent to the communication register which sets communication to
//reading the next 3 bytes from the Data register
InstancePtr->data1 = 0;
InstancePtr->data2 = 0;
InstancePtr->data3 = 0;
XSpi_Transfer(&InstancePtr->AD5Spi, bytes, bytes, 4);
InstancePtr->data1 = bytes[1];
InstancePtr->data2 = bytes[2];
InstancePtr->data3 = bytes[3];
}
/* ------------------------------------------------------------ */
/*** AD5_WriteConfig
**
** Synopsis:
** AD5_WriteConfig(PmodAD5* InstancePtr);
**
** Parameters:
** PmodAD5* InstancePtr - the PmodAD5 object to communicate with
**
** Return Value:
** none
**
** Errors:
** none
**
** Description:
** writes data to the configuration register through SPI. It sends the first byte to the communication
** register which sets communication to write for the next 3 bytes.
** gain is set to 1 and in differential mode
*/
void AD5_WriteConfig(PmodAD5* InstancePtr)
{
u8 bytes[4];
bytes[0] = 0x10; //first byte is sent to the communication register which sets communication to
//writing the next 3 bytes to the Configuration register
//gain is set to 1 and in differential mode
bytes[1] = 0x00;
bytes[2] = 0x01;
bytes[3] = 0x10;
XSpi_Transfer(&InstancePtr->AD5Spi, bytes, bytes, 4);
}
/* ------------------------------------------------------------ */
/*** AD5_DataToVoltage
**
** Synopsis:
** AD5_DataToVoltage(PmodAD5* InstancePtr);
**
** Parameters:
** PmodAD5* InstancePtr - the PmodAD5 object to communicate with
**
** Return Value:
** none
**
** Errors:
** none
**
** Description:
** Combines the 3 bytes into a unsigned long integer and then converts the digital data into a float voltage value
*/
float AD5_DataToVoltage(PmodAD5* InstancePtr) {
float voltage = 0;
// char mGain = 0;
float mVref = 2.5;
// char mPolarity = 0;
int PGAGain = 1;
unsigned long rawdata=0;
//combining the 3 byte data to one unsigned long integer
rawdata = InstancePtr->data1;
rawdata = rawdata * 256 +InstancePtr->data2;
rawdata = rawdata * 256 + InstancePtr->data3;
//converting from digital data to voltage
voltage = (((float)rawdata / (float)8388608) - (float)1) * (mVref / (float)PGAGain);
return(voltage);
}
- src里的PmodAD5.c
/*************************************************************************/
/* */
/* PmodAD5.h -- PmodAD5 Driver Source */
/* */
/*************************************************************************/
/* Author: Jon Peyron */
/* Copyright 2017, Digilent Inc. */
/*************************************************************************/
/* Module Description: */
/* */
/* This file contains source code for the PmodAD5 driver */
/* */
/*************************************************************************/
/* Revision History: */
/* */
/* 12/19/2017(JPEYRON): Created */
/* */
/*************************************************************************/
#ifndef PMODAD5_H
#define PMODAD5_H
/****************** Include Files ********************/
#include "xil_types.h"
#include "xstatus.h"
#include "xspi_l.h"
#include "xspi.h"
/* ------------------------------------------------------------ */
/* Definitions */
/* ------------------------------------------------------------ */
typedef struct PmodAD5 {
XSpi AD5Spi;
u8 data1;
u8 data2;
u8 data3;
} PmodAD5;
/* ------------------------------------------------------------ */
/* Procedure Declarations */
/* ------------------------------------------------------------ */
void AD5_begin(PmodAD5* InstancePtr, u32 SPI_Address);
void AD5_end(PmodAD5* InstancePtr);
int AD5_SPIInit(XSpi *SpiInstancePtr);
void AD5_readData(PmodAD5* InstancePtr);
void AD5_WriteConfig(PmodAD5* InstancePtr);
float AD5_DataToVoltage(PmodAD5* InstancePtr);
#endif // PMODAD5_H
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