patan_mustafa
Joined: 10 Dec 2006
Posts: 3
|
| ADF4351 Frequency Generator Code |
 Posted: Sun Feb 09, 2025 12:54 am |
 |
|
I write this code to bring up my ADF4351 setup with PIC16F1933. You can check your circuit with a fm radio while setting frequency between 88.0MHz-108.0MHz if you do not have an oscilloscope. You must hear a blank audio your at frequency setting. I connect adf output with a 1Mohm resistor to radio antenna
| Code: |
#define ADF_CE PIN_C3
#define ADF_LE PIN_C4
#define ADF_DATA PIN_C5
#define ADF_CLK PIN_C6
#define ADF_MUX PIN_C7
void write_to_adf4351(int32 a){
signed int i;
output_low(ADF_LE); for(i=31;i>=0;i--){ output_low(ADF_CLK); output_bit(ADF_DATA, bit_test(a,i)); delay_ms(1); output_high(ADF_CLK); } output_high(ADF_LE);
}
int divider=0;
int16 mod=10,keypad_value;
int32 intmask =0b01111111111111111000000000000000, intmasknot =0b10000000000000000111111111111111;
int32 fracmask =0b00000000000000000111111111111000, fracmasknot=0b11111111111111111000000000000111;
int32 frequency=35000, ref_in=10000, kademe,integer=0,frac=0;
int32 reg[6]={0x00700000,0x08000151,0x00004EC2,0x000004B3,0x00C5003C,0x00C00005};
float fstep=0;
// FREQUENCY value for 35.0MHZ is frequency=35000 @10MHz Ref in
void set_freq(void){
if(frequency>=10000 && frequency<=4400000){
if( frequency >= 10000 && frequency <= 17500){ divider=64; bit_set( reg[4],22); bit_set( reg[4],21); bit_clear(reg[4],20); mod=156; frequency=frequency*4; }
else if( frequency > 17500 && frequency < 34375){ divider=32; bit_set( reg[4],22); bit_clear(reg[4],21); bit_set( reg[4],20); mod=312; frequency=frequency*4; }
else if( frequency >= 34375 && frequency <= 70000){ divider=64; bit_set( reg[4],22); bit_set( reg[4],21); bit_clear(reg[4],20); mod=156; }
else if( frequency > 68750 && frequency <= 140000){ divider=32; bit_set( reg[4],22); bit_clear(reg[4],21); bit_set( reg[4],20); mod=312; }
else if( frequency > 137500 && frequency <= 275000){ divider=16; bit_set( reg[4],22); bit_clear(reg[4],21); bit_clear(reg[4],20); mod=625; }
else if( frequency > 275000 && frequency <= 550000){ divider=8; bit_clear(reg[4],22); bit_set( reg[4],21); bit_set( reg[4],20); mod=1250;}
else if( frequency > 550000 && frequency < 1100000){ divider=4; bit_clear(reg[4],22); bit_set( reg[4],21); bit_clear(reg[4],20); mod=2500;}
else if( frequency >=1100000 && frequency < 2200000){ divider=2; bit_clear(reg[4],22); bit_clear(reg[4],21); bit_set( reg[4],20); mod=4095;}
else if( frequency >=2200000 && frequency < 4400000){ divider=1; bit_clear(reg[4],22); bit_clear(reg[4],21); bit_clear(reg[4],20); mod=10;}
fstep=(float)ref_in/divider;
integer=(int32)frequency/fstep;
frac=frequency-(integer*fstep);
integer=(integer<< 15); integer=(integer)&intmask; reg[0]=(reg[0])&intmasknot; reg[0]=(integer)|reg[0];
frac =(frac << 3 ); frac =(frac )&fracmask; reg[0]=(reg[0])&fracmasknot; reg[0]=(frac )|reg[0];
mod =(mod << 3 ); mod =(mod )&fracmask; reg[1]=(reg[1])&fracmasknot; reg[1]=(mod )|reg[1];
write_to_adf4351(reg[5]); delay_ms(1);
write_to_adf4351(reg[4]); delay_ms(1);
write_to_adf4351(reg[3]); delay_ms(1);
write_to_adf4351(reg[2]); delay_ms(1);
write_to_adf4351(reg[1]); delay_ms(1);
write_to_adf4351(reg[0]); delay_ms(3);
}
}
|
|
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
