hello,
Not correct , you can see the schematic and photo of wiring on
my web page.
remark : i am not using AD9850 directly,but a breakboard
with an AD9850.
I suppose the correspondance D0..D7 of breakboard is the same as
D0..D7 of AD9850 !
Another people build successfully this application
with AD9850..the main difference is using a Pic18F46k22 and fclock 40Mhz
but i think no problemo with your pic ..
if hardware init is ok,because use only one port B and timming is not
critical.
Hi
After another 3 nights of work and stressful work, still at the same point where I started... Its not working no matter what ever I do. I have tried with increased delay with less delay, nothings gives a different output. tried with different daughter boards thinking that device might have died during experiments but nothing helped.
I have changed code for easy reading and posting here again and will really appreciate if you could tell me anything that I am doing wrong.
I am using external 4MHz XTAL and PIC18F4520
#include <p18f4520.h>
#include <delays.h>
#include <math.h>
#pragma config WDT=OFF
#pragma config LVP=OFF
#pragma config OSC=XT
#define RESET_AD9850 LATBbits.LATB4 // Reset line
#define SDATA LATBbits.LATB5 // Serial data line
#define W_CLCK LATBbits.LATB6 // Clock line to clock in data
#define FQ_UD LATBbits.LATB7 // Frequency up date line
//#define AD9850_CONTROL_WORD 0x00 // 8 Byte zeros
#define AD9850_FREQUENCY 4000000 // 4MHz
#define AD9850_FREQUENCY_FACTOR 34.35973837 // 2^32 divided by 125MHz
#define Byte unsigned char // Define CHAR as Byte data type
/*----------------------------------------------------------------------------------------
This structure's variable will be defined in UNION to access 32bit data in chunks of 8bits
-----------------------------------------------------------------------------------------*/
struct DataBytes
{
near Byte Byte0;
near Byte Byte1;
near Byte Byte2;
near Byte Byte3;
};
/*---------------------------------------------------------------------------------------
Since UNION's all variables point to the same storage location we define one variable
to get the 32bit data so it is defined as LONG data type, and to put it out as 8bit word
we define DATABYTE STRUCTURE's variable and access each element at a time to access 8bits
at one time.
------------------------------------------------------------------------------------------*/
union //ByteLevelAccess
{
near unsigned long TuningWord;
near struct DataBytes DDS;
}AD9850_Serial_Data;
/*------------------------------------------------------------------------------------------
CONTROL BYTE FOR AD9850
-------------------------------------------------------------------------------------------*/
unsigned char AD9850_CONTROL_WORD;
/*---------------------------------------
Prototype declerations of the functions
----------------------------------------*/
void Init_AD9850(void);
void SendSerialDataByteToAD9850(unsigned char Data);
void AD9850_Charge_Freq(float Freq);
void AD9850_DATA_IN_CLOCK(void);
void AD9850_RESET(void);
void FRQ_UD_AD9850(void);
/*--------------------------------------------------------------------------------------------
MAIN FUCNTION
---------------------------------------------------------------------------------------------*/
void main()
{
ADCON1 = 0x0F; // All pins are now digital I/O
TRISB = 0; // make all pin output
PORTB=0;
AD9850_CONTROL_WORD = 0; //initialize control word
Init_AD9850();
Delay10TCY();
AD9850_Charge_Freq(AD9850_FREQUENCY);
// return;
while(1);
}
/*-------------------------------------------------------------------------------------------
FUCNTION TO INITIALIZE THE AD9850 FOR SERIAL DATA INPUT
--------------------------------------------------------------------------------------------*/
void Init_AD9850(void)
{
Byte counter;
//initialize CLOCK,FRQ_UPDATE and SERIAL DATA lines with zero
//------------------------------------------------------------
//SDATA=0;
//W_CLCK=0;
//FQ_UD=0;
//------------------------------------------------------------
//Reset address pointer to W0 (first word) in AD9850
//--------------------------------------------------
AD9850_RESET();
//---------------------------------------------------
/*Initialize AD9850 for serial data input by setting W32=0, W33=0 and W34=0
by using following sequence
W_CLCK = 1
W_CLCK = 0
FQ_UD = 1
FQ_UD 0
Write W32=0, W33=0 and W34=0 sequencially and respectively to AD9850 chip
FQ_UD = 1 to reset the control word pointer to W0
FQ_UD = 0
--------------------------------------------------------------------------*/
AD9850_DATA_IN_CLOCK();
FRQ_UD_AD9850();
counter=0;
// Following loop sends zero three times to AD9850 as W32=0,W33=0 & W34=0
do
{
SDATA = 0;
AD9850_DATA_IN_CLOCK();
counter++;
}while (counter<3);
//Delay10TCY();//Delay10TCY();Delay10TCY(); //for settling of all the signals
//----------------------------------------------------------------------------
//Reset the control word pointer to W0 in AD9850
//-----------------------------------------------
FRQ_UD_AD9850();
}
/*--------------------------------------------------------------------------------------------
AD9850_Charge_Freq FUNCTION DEFINATION
---------------------------------------------------------------------------------------------*/
void AD9850_Charge_Freq(float Freq)
{
AD9850_Serial_Data.TuningWord = (long) (Freq * AD9850_FREQUENCY_FACTOR);
SendSerialDataByteToAD9850(AD9850_Serial_Data.DDS.Byte0);
SendSerialDataByteToAD9850(AD9850_Serial_Data.DDS.Byte1);
SendSerialDataByteToAD9850(AD9850_Serial_Data.DDS.Byte2);
SendSerialDataByteToAD9850(AD9850_Serial_Data.DDS.Byte3);
SendSerialDataByteToAD9850(AD9850_CONTROL_WORD);
Delay10TCY();
Delay10TCY();
Delay10TCY();
FRQ_UD_AD9850();
FRQ_UD_AD9850();
}
/*--------------------------------------------------------------------------------------------
SendSerialDataByteToAD9850 FUNCTION DEFINATION
---------------------------------------------------------------------------------------------*/
void SendSerialDataByteToAD9850(unsigned char Data)
{
Byte counter = 0;
do
{
SDATA = 0;
if(Data&1) SDATA=1; // Check LSB bit
Data = Data>>1; // RIGHT SHIFT THE DATA BY ONE BIT
AD9850_DATA_IN_CLOCK();
counter++;
}while(counter<8);
}
/*--------------------------------------------------------------------------------------------
AD9850_DATA_IN_CLOCK FUNCTION DEFINATION
---------------------------------------------------------------------------------------------*/
void AD9850_DATA_IN_CLOCK()
{
W_CLCK = 1;
Delay10TCY();
Delay10TCY();
W_CLCK = 0;
Delay10TCY();
Delay10TCY();
Delay10TCY();
Delay10TCY();
}
/*--------------------------------------------------------------------------------------------
RESET_AD9850 FUNCTION DEFINATION
---------------------------------------------------------------------------------------------*/
void AD9850_RESET()
{
RESET_AD9850=1;
Delay10TCY();
RESET_AD9850=0;
Delay10TCY();
Delay10TCY();
Delay10TCY();
Delay10TCY();
Delay10TCY();
Delay10TCY();
}
/*--------------------------------------------------------------------------------------------
FRQ_UD_AD9850 FUNCTION DEFINATION
---------------------------------------------------------------------------------------------*/
void FRQ_UD_AD9850(void)
{
FQ_UD = 1;
Delay10TCY();
Delay10TCY();
FQ_UD = 0;
Delay10TCY();
Delay10TCY();
Delay10TCY();
}