Instalation

Usage

GPIO Definitions and Initialization

// start off by including the library#include<AD9851.h>// define the GPIO pins to be used// you can use any pins you like#defineRST8#defineDATA9#defineFQ10#defineCLK11// Declare a DDS struct variable, globally or locally, depends on the scopeDDS dds;// somewhere in your setup() function// call the dds_init() function to construct dds_pin structure// and initialize the GPIO for youdds = dds_init(RST, DATA, FQ, CLK);// now you are ready to go!!

Available Functions

// This function will construct dds_pin structure and initialize the GPIO// The input arguments should be the dds pins GPIO definition// with the exact sequence: RST_pin, DATA_pin, FQ_pin, and CLK_pin respectively// Call this function first at your setup() and store the return value into your DDS struct variable// example: see Example section belowstructDDSdds_init(int rst_pin,int data_pin,int fq_pin,int clk_pin);// This function will reset the AD9851 DDS module// The input argument should be the DDS struct variable// You should call this function after the initialization// and before doing any frequency writing processvoiddds_reset(DDS dds);// This function will write the desired frequency into AD9851 and generate SINE WAVE// The 6 x Clock multiplier is always enabled (assume that you are using 30 MHz clock)// Frequency range: DC - 90 MHz (DC - 60 MHz in practice)// Input arguments are DDS struct variable and the desired frequency in Hertz (unsigned long)voidwriteFreq(DDS dds,unsignedlong freq);// This function will generate Frequency Sweep signal// Input arguments: - DDS struct variable//                  - center frequency in Hertz (unsigned long)//                  - sweep deviation in Hertz (unsigned long)//                  - sweep step or frequency resolution in Hertz (long)//                  - sweep delay in microseconds (unsigned int)//// To generate sweep-up tone, sweep step must be a positive value, hence,// to generate sweep-down tone, sweep step must be a negative value.//// Example: center freq = 30 MHz, sweep deviation = 100 kHz, sweep step = 100 Hz// will results in a sweep-up tone from 29950000 Hz to 30050000 Hz with sweep step of 100 Hz// After reaches 30050000 Hz (last step), then it will stay there// unless the sweepTone() function is being called again.//// REQUIREMENTS: - center frequency must be between DC - 90 MHz//               - sweep deviation must be less than the twice of the center frequency value//               - sweep step must be less than the sweep deviation divided by 65535//               - delay in microseconds must be less than 65535//// FAIL TO MEET THE REQUIREMENTS ABOVE MAY RESULTS IN ABNORMAL OR UNPREDICTABLE BEHAVIORvoidsweepTone(DDS dds,unsignedlong c_freq,unsignedlong s_dev,long s_step,unsignedint delay_us);

Example

Generate_Tone

Generate_Sweep

Generate_Random_Hopping

Contributing