8051 Embedded C code for generating a square wave using an 8-bit DAC (Digital-to-Analog Converter)

#include <reg51.h>

// Define the DAC output port

#define DAC_PORT P1

// Function to generate delay

void delay(unsigned int ms) {

    unsigned int i, j;

    for (i = 0; i < ms; i++) {

        for (j = 0; j < 123; j++);

    }

}

// Main function

void main() {

    while (1) {

        // Set the DAC output to high value (e.g., 0xFF)

        DAC_PORT = 0xFF;

        

        // Delay for half the period (high time)

        delay(10);

        

        // Set the DAC output to low value (e.g., 0x00)

        DAC_PORT = 0x00;

        

        // Delay for half the period (low time)

        delay(10);

    }

}

/*

In this code:

We define the DAC output port as DAC_PORT, which is connected to port P1 of the 8051 microcontroller. The DAC board receives the 8-bit input from this port.

The delay function is used to generate a delay in milliseconds. It uses nested loops to achieve the desired delay.

In the main function, we have an infinite loop that generates the square wave.

Inside the loop, we first set the DAC_PORT to a high value (e.g., 0xFF) using the statement DAC_PORT = 0xFF;. This value represents the maximum output voltage of the DAC.

We then introduce a delay of 10 milliseconds using the delay function. This delay represents the high time or the time for which the square wave remains at the high value.

After the high time delay, we set the DAC_PORT to a low value (e.g., 0x00) using the statement DAC_PORT = 0x00;. This value represents the minimum output voltage of the DAC.

We introduce another delay of 10 milliseconds, which represents the low time or the time for which the square wave remains at the low value.

The loop continues indefinitely, generating a continuous square wave with a period of 20 milliseconds (10 milliseconds high time + 10 milliseconds low time).

Note: The specific DAC board and its connection to the 8051 microcontroller may vary. Make sure to connect the appropriate pins of the microcontroller to the DAC board according to its datasheet or documentation.

Also, the delay values can be adjusted to change the frequency of the generated square wave. The DAC output values (0xFF and 0x00) can be modified to adjust the amplitude of the square wave based on the DAC's specifications.

Remember to configure the DAC board properly, including any necessary initialization or configuration settings, before running the code.

*/