UV Erasing

Programming

Writing demo program

#include <8051.h>
#include <stdio.h>
#include <stdbool.h>

int putchar(int c) {
    /* We never start when transmission is not complete */
    while (TI==0);      /* Wait until stop bit transmit */
    TI = 0;
    SBUF = c;     
    return c;
}

void toggle_led(void)
{
    P1_0 = !P1_0;
}

int main (void)
{
    int i, j, loop_limit;
    bool is_prime;

    //Serial port speed. Perfect 9600 for 18.432MHz crystal
    TH1 = (unsigned char)(256-5);//No "overflow in implicit constant conversion"
    TMOD = 0x20;
    SCON = 0x50;
    TR1  = 1;
    TI = 1;//To continue work while we are transmitting - we are waiting before transmission, not after


    printf("Hello world!\r\n");
    printf("Let's calculate some primes: 2");
    while (1) 
    {
      for (i = 3; i <= 32000; i+=2) {
          loop_limit = 180;
          if(i-1<loop_limit)loop_limit = i-1;//We will not calculate square root :-)
          is_prime = true;

          for (j = 2; j <= loop_limit; ++j) {
              if (i % j == 0) {
                  is_prime = false;
                  break;
              }
          }

          if (is_prime) {
              toggle_led();
              printf(" %d", i);
          }
      }

      printf("\r\nHere we go again: 2");
    }                             
}

Prototype assembly

Testing

Resume

Brief specs and internals

Benchmarks & tests

Conclusion

You know there’s a ten year delay in the Soviet Union of the delivery of an automobile, and only one out of seven families in the Soviet Union own automobiles. There’s a ten year wait. And you go through quite a process when you’re ready to buy, and then you put up the money in advance.

And this happened to a fella, and this is their story, that they tell, this joke, that this man, he laid down his money, and then the fella that was in charge, said to him, ‘Okay, come back in ten years and get your car.’ And he said, ‘Morning or afternoon?’ and the fella behind the counter said, ‘Well, ten years from now, what difference does it make?’ and he said, ‘Well, the plumber’s coming in the morning.'

import numpy as np
import matplotlib.pyplot as plt

def create_s_curve_lut():
    # Define parameters for the sigmoid curve
    a = 10.0  # Adjust this parameter to control the curve's shape
    b = 127.5  # Midpoint of the curve (127.5 for 8-bit grayscale)

    # Create the S-curve LUT using the sigmoid function
    lut = np.arange(256)
    lut = 255 / (1 + np.exp(-a * (lut - b) / 255))

    # Normalize the LUT to the 0-255 range
    lut = (lut - np.min(lut)) / (np.max(lut) - np.min(lut)) * 255

    return lut.astype(np.uint8)

# Create the S-curve LUT
s_curve_lut = create_s_curve_lut()

# Plot the S-curve for visualization
plt.plot(s_curve_lut, range(256))
plt.xlabel("Input Values (0-255)")
plt.ylabel("Output Values (0-255)")
plt.title("S-curve Contrast Enhancement LUT")
plt.show()

# You can access the S-curve LUT with s_curve_lut

plt.plot(s_curve_lut, range(256)) #It's a TRAP!
plt.plot(range(256), s_curve_lut) #This is correct

lut = (lut - np.min(lut)) / (np.max(lut) - np.min(lut)) * 255 #Rounding error, fractional part is discarded
lut = np.round((lut - np.min(lut)) / (np.max(lut) - np.min(lut)) * 255) #This is correct

• LLM's are like junior developers - they can and will do unexpected mistakes, they need clear instructions and guidance. The difference though is that junior developers will learn over time and LLM's will get better only in next generation. Like junior developers - LLM's needs to be "managed" with reasonable expectations.
  
• All code from LLM's must be verified, the more niche field - the more tests. LLM's generate code that looks correct, and when it's not - errors can be very subtle and expensive to debug/fix.
  
• In case of unexpected or puzzling results it is often faster to simply ask multiple LLM's : now in addition to ChatGPT (3.5/4) we have Copilot, Bard, Replit and more. None of these gave perfect results from the first time, but some errors were different and often less subtle / easier to get it working in 20 minutes total.
  
• Some of the errors are systematic for multiple LLM's, which apparently come from training data (as LLM's currently unconditionally trust training data, unlike humans). I.e. currently LLM's cannot exceed level training data on quality, but can only approach it. It is unclear how much further work on LLM's will be needed to get perfect result consistently, I afraid it might be the case where last 10% of the work require 90% of time.