ESP32 AD9850 (DDS Signal Generator)

DDS_AD9850.ino

#include "Arduino.h"
#include "SPI.h"

// Digital I/O used
#define AD9850_CS      21
#define AD9850_RST     22

// Global variables
uint32_t AD9850_CLOCK=125000000;  // Module crystal frequency. Tweak here for accuracy.
uint32_t sweep=0;
uint32_t sweep_max=2000;
uint32_t sweep_min=1000;
boolean  sweep_direction=false;



// Objects
SPISettings SPI_AD9850;

void AD9850_set_frequency(uint32_t freq){
    freq=freq * 4294967295/AD9850_CLOCK;
    digitalWrite(AD9850_CS, LOW);
    SPI.beginTransaction(SPI_AD9850);
    SPI.write32(freq);
    SPI.write(0);
    SPI.endTransaction();
    digitalWrite(AD9850_CS, HIGH);
}

void AD9850_reset(){
    // RESET AD9850
    digitalWrite(AD9850_RST, HIGH);
    delay(1);
    digitalWrite(AD9850_RST, LOW);
    delay(1);
    AD9850_set_frequency(0);
    delay(1);
}

//The setup function is called once at startup of the sketch
void setup(){
    pinMode(AD9850_CS,  OUTPUT); digitalWrite(AD9850_CS, HIGH);
    pinMode(AD9850_RST, OUTPUT); digitalWrite(AD9850_RST, LOW);

    SPI.begin();
    SPI_AD9850=SPISettings(1000000, LSBFIRST, SPI_MODE0);
    AD9850_reset();

    AD9850_set_frequency(10000);
    delay(1000);

    sweep=sweep_min;
    sweep_direction=true;
}

// The loop function is called in an endless loop
void loop(){
    if(sweep==sweep_min) sweep_direction=true;
    if(sweep==sweep_max) sweep_direction=false;
    if(sweep_direction==true) sweep++; else sweep--;
    AD9850_set_frequency(sweep);
    delay(2);
}

Hi Thanks for your post. Could you tell us how you connect pins from AD9850 to ESP? Thank you

You need:
GPIO21 CS -> FQ_UD
GPIO22 RST -> RESET
GPIO23 MOSI -> Serial Data
GPIO 18 CLK -> W_CLK

Hi, Thanks for your reply. It's working well now. Thank you. Best, Changrong Sent from Outlook for iOS<https://aka.ms/o0ukef>

…

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________________________________ You need: GPIO21 CS -> FQ_UD GPIO22 RST -> RESET GPIO23 MOSI -> Serial Data GPIO 18 CLK -> W_CLK — Reply to this email directly, view it on GitHub<https://gist.github.com/schreibfaul1/a5caac2ba71f2cc1bb788ac047a01398#gistcomment-4790535> or unsubscribe<https://github.com/notifications/unsubscribe-auth/A5AJXPWPKSF7QK3G24JM4XLYJBXR7BFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFQKSXMYLMOVS2I5DSOVS2I3TBNVS3W5DIOJSWCZC7OBQXE5DJMNUXAYLOORPWCY3UNF3GS5DZVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVA4TQNZSHA4DONNHORZGSZ3HMVZKMY3SMVQXIZI>. You are receiving this email because you commented on the thread. Triage notifications on the go with GitHub Mobile for iOS<https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android<https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.