OLED Interface with PIC16f877A by using SPI Communication

To interface an OLED display with SPI using a PIC16F877A microcontroller, you can follow these general steps: Choose an OLED display that supports SPI communication. Make sure to read the datasheet and understand how to communicate with the display using SPI. Configure the SPI module of the PIC16F877A. The PIC16F877A has a built-in SPI module that can be configured to work in Master mode. You will need to set the appropriate registers to configure the SPI module, such as the SSPCON register. Write a software program to communicate with the OLED display. This program should send commands and data to the display using the SPI module of the PIC16F877A. The program will need to follow the communication protocol specified in the OLED display datasheet. Connect the OLED display to the SPI pins of the PIC16F877A. You will need to connect the MOSI (Master Out Slave In), MISO (Master In Slave Out), and SCK (Serial Clock) pins of the PIC16F877A to the corresponding pins on the OLED display. You may also need to connect additional pins for chip select (CS) and data/command select (DC). Test the OLED display. Once you have written the program and connected the OLED display, you can test the communication by sending commands and data to the display and verifying that it responds as expected.

       

            #include 

// Configuration bits
#pragma config FOSC = HS
#pragma config WDTE = OFF
#pragma config PWRTE = OFF
#pragma config BOREN = ON
#pragma config LVP = OFF
#pragma config CPD = OFF
#pragma config WRT = OFF
#pragma config CP = OFF

// Function to initialize the SPI module
void spi_init()
{
    TRISC5 = 0; // SDO pin as output
    TRISC4 = 1; // SDI pin as input
    TRISC3 = 0; // SCK pin as output
    TRISA5 = 0; // CS pin as output
    
    SSPSTAT = 0x00;
    SSPCON = 0x20;
}

// Function to send a command to the OLED display
void oled_cmd(unsigned char cmd)
{
    RA5 = 0; // Set CS low to select the OLED display
    
    SSPBUF = 0x00; // Send the command byte
    while(!SSPSTATbits.BF); // Wait for the transmission to complete
    
    RA5 = 1; // Set CS high to deselect the OLED display
}

// Function to send data to the OLED display
void oled_data(unsigned char data)
{
    RA5 = 0; // Set CS low to select the OLED display
    
    SSPBUF = 0x40; // Send the data byte
    while(!SSPSTATbits.BF); // Wait for the transmission to complete
    
    RA5 = 1; // Set CS high to deselect the OLED display
}

// Main function
void main()
{
    spi_init(); // Initialize the SPI module
    
    oled_cmd(0xAE); // Display off
    
    // Send initialization commands (see SSD1306 datasheet for details)
    oled_cmd(0xD5);
    oled_cmd(0x80);
    oled_cmd(0xA8);
    oled_cmd(0x3F);
    oled_cmd(0xD3);
    oled_cmd(0x00);
    oled_cmd(0x40);
    oled_cmd(0x8D);
    oled
}