Interfacing OLED SSD1306 with nRF52832 on Zephyr

[Amank0623]

Subject: Query: Interfacing OLED SSD1306 with nRF52832 on Zephyr

Dear Zephyr Dev Zone Community,

I hope this message finds you well. I am currently working on a project that involves interfacing an OLED SSD1306 display with an nRF52832 microcontroller using the Zephyr RTOS. I have encountered some challenges during the integration process and would greatly appreciate your assistance in resolving them.

Specifically, I am facing issues with initializing and communicating with the OLED SSD1306 display through the nRF52832 microcontroller. Despite following the documentation and examples available, I have been unable to achieve successful communication and display output.

Here are some key details about my setup and the issues I'm encountering:

1. Hardware Setup:

   • OLED SSD1306 display (specify model/version if applicable)
   • nRF52832 microcontroller development board
   • Connections made using (I2C/SPI) interface
   • Power supply and wiring configurations

2. Software Environment:

   • Zephyr RTOS version: [Specify version]
   • Development environment/tools used: [Specify IDE, SDK, etc.]
   • Relevant code snippets/configuration files: [Provide snippets of initialization code, device tree configuration, etc.]

3. Issues Encountered:

   • Initialization problems: Difficulty initializing the OLED display driver.
   • Communication errors: Unable to establish communication between the microcontroller and the OLED display.
   • Display output: No output or incorrect display output observed on the OLED screen.

I would greatly appreciate any guidance, tips, or insights you can provide to help me overcome these challenges and successfully interface the OLED SSD1306 display with the nRF52832 microcontroller on the Zephyr RTOS.

Thank you very much for your time and assistance. I look forward to your valuable input and suggestions.

Best regards, Aman

[Amank0623]

/*overlay file*/

&arduino_i2c {                                                                                
    status = "okay";  
    compatible = "nordic,nrf-twi";                                                                  
  //  zephyr,concat-buf-size = <2048>;                                                      
                                                                                         
    ssd1306fb: ssd1306fb@3c {                                                                          
            compatible = "solomon,ssd1306fb";                                            
            reg = <0x3c>;                                                                
            label = "SSD1306";                                                            
            width = <128>;                                                                
            height = <64>;                                                                
            segment-offset = <0>;                                                        
            page-offset = <0>;                                                            
            display-offset = <0>;                                                        
            multiplex-ratio = <63>;                                                      
            segment-remap;                                                                
            com-invdir;
            inversion-on;                                                                  
            prechargep = <0x22>;                                                          
    };                                                                                    
};

[Amank0623]

/*prj*/

CONFIG_GPIO=y

CONFIG_HEAP_MEM_POOL_SIZE=16384
CONFIG_MAIN_STACK_SIZE=4096

CONFIG_DEBUG_OPTIMIZATIONS=y
CONFIG_ASSERT=y

CONFIG_I2C=y

CONFIG_DISPLAY=y
CONFIG_DISPLAY_LOG_LEVEL_DBG=y
# CONFIG_LOG_STRDUP_BUF_COUNT=

CONFIG_SSD1306=y
CONFIG_SSD1306_REVERSE_MODE=y
# CONFIG_SSD1306_SH1106_COMPATIBLE=n

CONFIG_LOG=y

# Console
CONFIG_CONSOLE=y
CONFIG_UART_CONSOLE=y
CONFIG_STDOUT_CONSOLE=y
CONFIG_PRINTK=y
CONFIG_EARLY_CONSOLE=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y

# CFB
CONFIG_CFB_LOG_LEVEL_DBG=y
CONFIG_CHARACTER_FRAMEBUFFER=y

[Amank0623]

/*main*/

#include <zephyr/zephyr.h>
#include <zephyr/device.h>
#include <zephyr/drivers/display.h>
#include <zephyr/display/cfb.h>
#include <stdio.h>
#define FRAMEBUFFER_SIZE_MULTIPLIER 2

void main()
{
const struct device *dev;
uint8_t font_width;
uint8_t font_height;
uint16_t display_width;
uint16_t display_height;
// struct char_framebuffer *fb = &char_fb;

dev = device_get_binding("SSD1306");

if (dev == NULL)
{
printk("Device not found\n");
return;
}

if (display_set_pixel_format(dev, PIXEL_FORMAT_MONO10) != 0)
{
printk("Failed to set required pixel format\n");
return;
}

printk("initialized %s\n", "SSD1306");

if (cfb_framebuffer_init(dev))
{
printk("Framebuffer initialization failed!\n");
return;
}

// fb->size = fb->x_res * fb->y_res / fb->ppt * FRAMEBUFFER_SIZE_MULTIPLIER;

int err = (cfb_framebuffer_clear(dev, true));
// printk("%d\n", err);
cfb_framebuffer_invert(dev);
display_blanking_off(dev);

if (cfb_get_font_size(dev, 0, &font_width, &font_height))
{
printk("Failed to get font size\n");
return;
}

display_width = cfb_get_display_parameter(dev, CFB_DISPLAY_WIDTH);
display_height = cfb_get_display_parameter(dev, CFB_DISPLAY_HEIGH);

const char *text = "Hello, World!";
const uint16_t text_width = font_width;
const uint16_t text_height = font_height;

// Adjust starting position to display text at the bottom
const uint16_t *start_x = (display_width - text_width)/2;
const uint16_t *start_y = display_height - text_height/2;

printk("start_x=%d\n", start_x);
printk("start_y=%d\n", start_y);

if (cfb_draw_text(dev, text, start_x, start_y))
 {
printk("Failed to print string\n");
return;
}

// cfb_invert_area(dev,0, 22,text_width,text_height);
 cfb_framebuffer_finalize(dev); // display_blanking_on(dev);
}

[Øyvind]

Sorry for the late reply. I started to answer yesterday but somehow the answer was not posted. 

I tested your application and got the following output on the display

I also tested the LVGL sample from the Zephyr samples and got this output

These seem to work both perfectly on the nRF52DK_nRF52832 built with -DSHIELD=ssd1306_128x64

Kind regards,
Øyvind

[Amank0623]

in your system its working fine but i am facing this issue with that