etcpccoe

 #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() {     unsigned char dac_value = 0;     unsigned char step = 1;     while (1) {         // Set the DAC output value         DAC_PORT = dac_value;                  // Delay for a short period         delay(1);                  // Update the DAC value for the next step         dac_value += step;                  // Check if the DAC value reaches the maximum or minimum         if (dac_value == 0xFF || dac_value == 0x00) {             // Reverse the step direction             step = -step;         }     } } /* 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 short del