arduino ad9850

[kukulako]

can i use this script with arduino ad9850 signal generator.....?/

[rwaldron]

Sorry for the delay in responding. Currently there is no explicit support for such devices, but johnny-five is always interested in exploring possibilities.

[kukulako]

ok thanks..

[kukulako]

@rwaldron

this is a arduino sketch in C

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/*
 * A simple single freq AD9850 Arduino test script
 * Original AD9851 DDS sketch by Andrew Smallbone at www.rocketnumbernine.com
 * Modified for testing the inexpensive AD9850 ebay DDS modules
 * Pictures and pinouts at nr8o.dhlpilotcentral.com
 * 9850 datasheet at http://www.analog.com/static/imported-files/data_sheets/AD9850.pdf
 * Use freely
 */

 #define W_CLK 8       // Pin 8 - connect to AD9850 module word load clock pin (CLK)
 #define FQ_UD 9       // Pin 9 - connect to freq update pin (FQ)
 #define DATA 10       // Pin 10 - connect to serial data load pin (DATA)
 #define RESET 11      // Pin 11 - connect to reset pin (RST).

 #define pulseHigh(pin) {digitalWrite(pin, HIGH); digitalWrite(pin, LOW); }

 // transfers a byte, a bit at a time, LSB first to the 9850 via serial DATA line
void tfr_byte(byte data)
{
  for (int i=0; i<8; i++, data>>=1) {
    digitalWrite(DATA, data & 0x01);
    pulseHigh(W_CLK);   //after each bit sent, CLK is pulsed high
  }
}

 // frequency calc from datasheet page 8 = <sys clock> * <frequency tuning word>/2^32
void sendFrequency(double frequency) {
  int32_t freq = frequency * 4294967295/125000000;  // note 125 MHz clock on 9850
  for (int b=0; b<4; b++, freq>>=8) {
    tfr_byte(freq & 0xFF);
  }
  tfr_byte(0x000);   // Final control byte, all 0 for 9850 chip
  pulseHigh(FQ_UD);  // Done!  Should see output
}

void setup() {
 // configure arduino data pins for output
  pinMode(FQ_UD, OUTPUT);
  pinMode(W_CLK, OUTPUT);
  pinMode(DATA, OUTPUT);
  pinMode(RESET, OUTPUT);

  pulseHigh(RESET);
  pulseHigh(W_CLK);
  pulseHigh(FQ_UD);  // this pulse enables serial mode - Datasheet page 12 figure 10
}

void loop() {
  sendFrequency(10.e6);  // freq
  while(1);
}

someone hacked that Arduino sketch into a piece of Python code for the Pi..

#!/usr/local/bin/python
# Run an eBay AD9850 on the RPi GPIO
#
# translated from nr8o's Arduino sketch
# at http://nr8o.dhlpilotcentral.com/?p=83
# 
# m0xpd
# shack.nasties 'at Gee Male dot com'
import RPi.GPIO as GPIO
# setup GPIO options...
GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)

W_CLK = 12                          # Define GPIO pins
FQ_UD = 16
DATA = 18
RESET = 22  

def pulseHigh(pin):                     # Function to send a pulse
    GPIO.output(pin, True)              # do it a few times to increase pulse width
    GPIO.output(pin, True)              # (easier than writing a delay loop!)
    GPIO.output(pin, True)
    GPIO.output(pin, False)             # end of the pulse
    return

def tfr_byte(data):                     # Function to send a byte by serial "bit-banging"
    for i in range (0,8):
        GPIO.output(DATA, data & 0x01)  # Mask out LSB and put on GPIO pin "DATA"
        pulseHigh(W_CLK)                # pulse the clock line
        data=data>>1                    # Rotate right to get next bit
    return

def sendFrequency(frequency):           # Function to send frequency (assumes 125MHz xtal)
    freq=long(frequency*4294967296/125000000)
    for b in range (0,4):
        tfr_byte(freq & 0xFF)
        freq=freq>>8
    tfr_byte(0x00)
    pulseHigh(FQ_UD)
    return

GPIO.setup(W_CLK, GPIO.OUT)             # setup IO bits...
GPIO.setup(FQ_UD, GPIO.OUT)             #
GPIO.setup(DATA, GPIO.OUT)              #
GPIO.setup(RESET, GPIO.OUT)             #

GPIO.output(W_CLK, False)               # initialize everything to zero...
GPIO.output(FQ_UD, False)
GPIO.output(DATA, False)
GPIO.output(RESET, False)

pulseHigh(RESET)                        # start-up sequence...
pulseHigh(W_CLK)
pulseHigh(FQ_UD)

frequency = 7000000                     # choose frequency and
sendFrequency(frequency)                # start the oscillator

web pages credits

http://m0xpd.blogspot.com/2013_01_01_archive.html http://nr8o.dhlpilotcentral.com/?p=83

[reconbot]

I'm going to close this issue due to it's age, but if you'd like to continue with it feel free to reopen.