Generic CPU driven Direct Digital Synthesis Sine Wave code for Arduino, tested with STM32F405 Feather board

arduino_dds_sin_cpu.ino

#define NS  64
 
// Sine Wave Look-Up-Table, generated in Python:
/*
from numpy import *
bits = 12
samps = 64
A = 2**(bits-1)
X = linspace(0.0,1.0,samps)
Y = A*sin(2*pi*X) + A
print(",".join(map(str,Y.astype('uint32'))))
*/

uint32_t Sine_LUT[NS] = {
    2048,2251,2453,2651,2843,3027,3201,3364,
    3514,3649,3768,3870,3954,4019,4064,4090,
    4095,4080,4044,3989,3914,3821,3710,3583,
    3440,3284,3115,2936,2748,2553,2353,2150,
    1945,1742,1542,1347,1159, 980, 811, 655,
     512, 385, 274, 181, 106,  51,  15,   0,
       5,  31,  76, 141, 225, 327, 446, 581,
     731, 894,1068,1252,1444,1642,1844,2047
};
 
const int LOOP_DELAY_MICROS = 1;

void setup() {
  // Initialize the LED pin as an output
  pinMode(A0, OUTPUT);
  analogWriteResolution(12);
}

void loop() {
  // Main loop code
  for (int i = 0; i < NS - 1; i++){
    analogWrite(A0,Sine_LUT[i]);
    //No delay 64 samples on 168 Mhz STM32F405 (Optimized Fastest with LTO) gives 25 us period = 40kHz
    //delayMicroseconds(LOOP_DELAY_MICROS);  
  }
}

Test: No delay 64 samples on 168 Mhz STM32F405 (Optimized Fastest with LTO)
Measured with Joulescope, shows period 25 us -> f = 40kHz