diff --git a/src/07_miniproj/oled/Makefile b/src/07_miniproj/oled/Makefile
new file mode 100644
index 0000000..6eff97c
--- /dev/null
+++ b/src/07_miniproj/oled/Makefile
@@ -0,0 +1,58 @@
+EXEC=oleds
+DTB = mydt.dtb
+SRCS=$(wildcard *.c)
+
+target=nano
+
+TOOLCHAIN_PATH=/buildroot/output/host/usr/bin/
+TOOLCHAIN=$(TOOLCHAIN_PATH)aarch64-linux-
+CFLAGS=-Wall -Wextra -g -c -O0 -MD -std=gnu11
+CFLAGS+=-mcpu=cortex-a53 -funwind-tables
+##CFLAGS+=-O2 -fno-omit-frame-pointer
+OBJDIR=.obj/nano
+
+CC=$(TOOLCHAIN)gcc
+LD=$(TOOLCHAIN)gcc
+AR=$(TOOLCHAIN)ar
+STRIP=$(TOOLCHAIN)strip
+
+OBJDIR=.obj/$(target)
+OBJS= $(addprefix $(OBJDIR)/, $(SRCS:.c=.o))
+
+$(OBJDIR)/%o: %c
+	$(CC) $(CFLAGS) $< -o $@
+
+all: $(OBJDIR)/ $(EXEC) dtb
+	echo $(EXEC)
+	echo $(SRCS)
+
+$(EXEC): $(OBJS) $(LINKER_SCRIPT)
+	$(LD) $(OBJS) $(LDFLAGS) -o $@
+
+$(OBJDIR)/:
+	mkdir -p $(OBJDIR)
+
+clean:
+	rm -Rf $(OBJDIR) $(EXEC) $(EXEC)_s .obj *.dtb *~
+
+clean_all: clean
+
+CVER     := aarch64-linux-
+KVER     := 5.15.21
+CPU      := arm64
+
+KDIR     := /buildroot/output/build/linux-$(KVER)/
+PWD := $(shell pwd)
+
+INCL+=-I. -I$(KDIR)/include -I$(KDIR)/arch/arm64/boot/dts/
+DTS = $(DTB:.dtb=.dts)
+
+dtb: $(DTB)
+$(DTB) : $(DTS)
+	ln -s $(KDIR)/arch/arm/boot/dts arm
+	-cpp $(INCL) -E -P -x assembler-with-cpp $(DTS) | dtc -I dts -O dtb -o $(DTB) -
+	rm arm
+
+-include $(OBJS:.o=.d)
+
+.PHONY: all clean clean_all dtb
diff --git a/src/07_miniproj/oled/main.c b/src/07_miniproj/oled/main.c
new file mode 100644
index 0000000..664e4dd
--- /dev/null
+++ b/src/07_miniproj/oled/main.c
@@ -0,0 +1,23 @@
+#include "ssd1306.h"
+
+int main()
+{
+    ssd1306_init();
+
+    ssd1306_set_position (0,0);
+    ssd1306_puts("CSEL1a - SP.07");
+    ssd1306_set_position (0,1);
+    ssd1306_puts("  Demo - SW");
+    ssd1306_set_position (0,2);
+    ssd1306_puts("--------------");
+
+    ssd1306_set_position (0,3);
+    ssd1306_puts("Temp: 35'C");
+    ssd1306_set_position (0,4);
+    ssd1306_puts("Freq: 1Hz");
+    ssd1306_set_position (0,5);
+    ssd1306_puts("Duty: 50%");
+
+    return 0;
+}
+
diff --git a/src/07_miniproj/oled/mydt.dts b/src/07_miniproj/oled/mydt.dts
new file mode 100644
index 0000000..8841022
--- /dev/null
+++ b/src/07_miniproj/oled/mydt.dts
@@ -0,0 +1,13 @@
+/dts-v1/;
+
+#include "allwinner/sun50i-h5-nanopi-neo-plus2.dts"
+
+/ {
+    /delete-node/ leds;
+};
+
+&i2c0 {
+        status = "okay";
+};
+
+
diff --git a/src/07_miniproj/oled/ssd1306.c b/src/07_miniproj/oled/ssd1306.c
new file mode 100644
index 0000000..a8e7195
--- /dev/null
+++ b/src/07_miniproj/oled/ssd1306.c
@@ -0,0 +1,236 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/i2c-dev.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "ssd1306.h"
+
+// this code is mainly based on Bakebit software: https://github.com/friendlyarm/BakeBit
+
+#define ARRAY_OF(x) (sizeof(x)/sizeof(x[0]))
+
+#define I2C_BUS                 "/dev/i2c-0"
+#define OLED_ADDR               0x3c	
+#define OLED_COMMAND_MODE       0x00
+#define OLED_DATA_MODE          0x40 
+#define OLED_DISPLAY_OFF_CMD    0xae 
+#define OLED_DISPLAY_ON_CMD     0xaf
+
+static const uint8_t font[][8] = {
+{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
+{0x00,0x00,0x5F,0x00,0x00,0x00,0x00,0x00},
+{0x00,0x00,0x07,0x00,0x07,0x00,0x00,0x00},
+{0x00,0x14,0x7F,0x14,0x7F,0x14,0x00,0x00},
+{0x00,0x24,0x2A,0x7F,0x2A,0x12,0x00,0x00},
+{0x00,0x23,0x13,0x08,0x64,0x62,0x00,0x00},
+{0x00,0x36,0x49,0x55,0x22,0x50,0x00,0x00},
+{0x00,0x00,0x05,0x03,0x00,0x00,0x00,0x00},
+{0x00,0x1C,0x22,0x41,0x00,0x00,0x00,0x00},
+{0x00,0x41,0x22,0x1C,0x00,0x00,0x00,0x00},
+{0x00,0x08,0x2A,0x1C,0x2A,0x08,0x00,0x00},
+{0x00,0x08,0x08,0x3E,0x08,0x08,0x00,0x00},
+{0x00,0xA0,0x60,0x00,0x00,0x00,0x00,0x00},
+{0x00,0x08,0x08,0x08,0x08,0x08,0x00,0x00},
+{0x00,0x60,0x60,0x00,0x00,0x00,0x00,0x00},
+{0x00,0x20,0x10,0x08,0x04,0x02,0x00,0x00},
+{0x00,0x3E,0x51,0x49,0x45,0x3E,0x00,0x00},
+{0x00,0x00,0x42,0x7F,0x40,0x00,0x00,0x00},
+{0x00,0x62,0x51,0x49,0x49,0x46,0x00,0x00},
+{0x00,0x22,0x41,0x49,0x49,0x36,0x00,0x00},
+{0x00,0x18,0x14,0x12,0x7F,0x10,0x00,0x00},
+{0x00,0x27,0x45,0x45,0x45,0x39,0x00,0x00},
+{0x00,0x3C,0x4A,0x49,0x49,0x30,0x00,0x00},
+{0x00,0x01,0x71,0x09,0x05,0x03,0x00,0x00},
+{0x00,0x36,0x49,0x49,0x49,0x36,0x00,0x00},
+{0x00,0x06,0x49,0x49,0x29,0x1E,0x00,0x00},
+{0x00,0x00,0x36,0x36,0x00,0x00,0x00,0x00},
+{0x00,0x00,0xAC,0x6C,0x00,0x00,0x00,0x00},
+{0x00,0x08,0x14,0x22,0x41,0x00,0x00,0x00},
+{0x00,0x14,0x14,0x14,0x14,0x14,0x00,0x00},
+{0x00,0x41,0x22,0x14,0x08,0x00,0x00,0x00},
+{0x00,0x02,0x01,0x51,0x09,0x06,0x00,0x00},
+{0x00,0x32,0x49,0x79,0x41,0x3E,0x00,0x00},
+{0x00,0x7E,0x09,0x09,0x09,0x7E,0x00,0x00},
+{0x00,0x7F,0x49,0x49,0x49,0x36,0x00,0x00},
+{0x00,0x3E,0x41,0x41,0x41,0x22,0x00,0x00},
+{0x00,0x7F,0x41,0x41,0x22,0x1C,0x00,0x00},
+{0x00,0x7F,0x49,0x49,0x49,0x41,0x00,0x00},
+{0x00,0x7F,0x09,0x09,0x09,0x01,0x00,0x00},
+{0x00,0x3E,0x41,0x41,0x51,0x72,0x00,0x00},
+{0x00,0x7F,0x08,0x08,0x08,0x7F,0x00,0x00},
+{0x00,0x41,0x7F,0x41,0x00,0x00,0x00,0x00},
+{0x00,0x20,0x40,0x41,0x3F,0x01,0x00,0x00},
+{0x00,0x7F,0x08,0x14,0x22,0x41,0x00,0x00},
+{0x00,0x7F,0x40,0x40,0x40,0x40,0x00,0x00},
+{0x00,0x7F,0x02,0x0C,0x02,0x7F,0x00,0x00},
+{0x00,0x7F,0x04,0x08,0x10,0x7F,0x00,0x00},
+{0x00,0x3E,0x41,0x41,0x41,0x3E,0x00,0x00},
+{0x00,0x7F,0x09,0x09,0x09,0x06,0x00,0x00},
+{0x00,0x3E,0x41,0x51,0x21,0x5E,0x00,0x00},
+{0x00,0x7F,0x09,0x19,0x29,0x46,0x00,0x00},
+{0x00,0x26,0x49,0x49,0x49,0x32,0x00,0x00},
+{0x00,0x01,0x01,0x7F,0x01,0x01,0x00,0x00},
+{0x00,0x3F,0x40,0x40,0x40,0x3F,0x00,0x00},
+{0x00,0x1F,0x20,0x40,0x20,0x1F,0x00,0x00},
+{0x00,0x3F,0x40,0x38,0x40,0x3F,0x00,0x00},
+{0x00,0x63,0x14,0x08,0x14,0x63,0x00,0x00},
+{0x00,0x03,0x04,0x78,0x04,0x03,0x00,0x00},
+{0x00,0x61,0x51,0x49,0x45,0x43,0x00,0x00},
+{0x00,0x7F,0x41,0x41,0x00,0x00,0x00,0x00},
+{0x00,0x02,0x04,0x08,0x10,0x20,0x00,0x00},
+{0x00,0x41,0x41,0x7F,0x00,0x00,0x00,0x00},
+{0x00,0x04,0x02,0x01,0x02,0x04,0x00,0x00},
+{0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00},
+{0x00,0x01,0x02,0x04,0x00,0x00,0x00,0x00},
+{0x00,0x20,0x54,0x54,0x54,0x78,0x00,0x00},
+{0x00,0x7F,0x48,0x44,0x44,0x38,0x00,0x00},
+{0x00,0x38,0x44,0x44,0x28,0x00,0x00,0x00},
+{0x00,0x38,0x44,0x44,0x48,0x7F,0x00,0x00},
+{0x00,0x38,0x54,0x54,0x54,0x18,0x00,0x00},
+{0x00,0x08,0x7E,0x09,0x02,0x00,0x00,0x00},
+{0x00,0x18,0xA4,0xA4,0xA4,0x7C,0x00,0x00},
+{0x00,0x7F,0x08,0x04,0x04,0x78,0x00,0x00},
+{0x00,0x00,0x7D,0x00,0x00,0x00,0x00,0x00},
+{0x00,0x80,0x84,0x7D,0x00,0x00,0x00,0x00},
+{0x00,0x7F,0x10,0x28,0x44,0x00,0x00,0x00},
+{0x00,0x41,0x7F,0x40,0x00,0x00,0x00,0x00},
+{0x00,0x7C,0x04,0x18,0x04,0x78,0x00,0x00},
+{0x00,0x7C,0x08,0x04,0x7C,0x00,0x00,0x00},
+{0x00,0x38,0x44,0x44,0x38,0x00,0x00,0x00},
+{0x00,0xFC,0x24,0x24,0x18,0x00,0x00,0x00},
+{0x00,0x18,0x24,0x24,0xFC,0x00,0x00,0x00},
+{0x00,0x00,0x7C,0x08,0x04,0x00,0x00,0x00},
+{0x00,0x48,0x54,0x54,0x24,0x00,0x00,0x00},
+{0x00,0x04,0x7F,0x44,0x00,0x00,0x00,0x00},
+{0x00,0x3C,0x40,0x40,0x7C,0x00,0x00,0x00},
+{0x00,0x1C,0x20,0x40,0x20,0x1C,0x00,0x00},
+{0x00,0x3C,0x40,0x30,0x40,0x3C,0x00,0x00},
+{0x00,0x44,0x28,0x10,0x28,0x44,0x00,0x00},
+{0x00,0x1C,0xA0,0xA0,0x7C,0x00,0x00,0x00},
+{0x00,0x44,0x64,0x54,0x4C,0x44,0x00,0x00},
+{0x00,0x08,0x36,0x41,0x00,0x00,0x00,0x00},
+{0x00,0x00,0x7F,0x00,0x00,0x00,0x00,0x00},
+{0x00,0x41,0x36,0x08,0x00,0x00,0x00,0x00},
+{0x00,0x02,0x01,0x01,0x02,0x01,0x00,0x00},
+{0x00,0x02,0x05,0x05,0x02,0x00,0x00,0x00},
+};
+
+
+static const uint8_t init_commands[] = {
+    0xAE,    //display off
+    0x00,    //set lower column address
+    0x10,    //set higher column address
+    0x40,    //set display start line
+    0xB0,    //set page address
+    0x81,
+    0xCF,    //0~255????????????????
+    0xA1,    //set segment remap
+    0xA6,    //normal / reverse
+    0xA8,    //multiplex ratio
+    0x3F,    //duty = 1/64
+    0xC8,    //Com scan direction
+    0xD3,    //set display offset
+    0x00,
+    0xD5,    //set osc division
+    0x80,
+    0xD9,    //set pre-charge period
+    0xF1,
+    0xDA,    //set COM pins
+    0x12,
+    0xDB,    //set vcomh
+    0x40,
+    0x8D,    //set charge pump enable
+    0x14,
+    0xAF,    //display ON
+
+};
+
+static int fd;
+
+static void send_command(uint8_t cmd)
+{
+    uint8_t buf[2]= {
+        [0] = OLED_COMMAND_MODE,
+        [1] = cmd,
+    };
+    if (write(fd, buf, sizeof(buf)) != sizeof(buf)) {
+        printf ("error while sending command\n");
+    }
+}
+
+void send_data(uint8_t byte) 
+{
+    uint8_t buf[2] = {
+        [0] = OLED_DATA_MODE,
+        [1] = byte,
+    };
+    if (write(fd, buf, sizeof(buf)) != sizeof(buf)) {
+        printf ("error while sending data\n");
+    }
+}
+
+void ssd1306_set_position (uint32_t column, uint32_t row)
+{
+    send_command(0xb0 + row);                   //set page address
+    send_command(0x00 + (8*column & 0x0f));     //set column lower address
+    send_command(0x10 + ((8*column>>4)&0x0f));  //set column higher address
+}
+
+void ssd1306_putc(char c) 
+{
+	if ((c<32) || (c>127))      // Ignore non-printable ASCII characters
+		c=' ';
+    c-=32;
+
+	for (int i=0; i<8; i++) {
+		uint8_t data=font[(int)c][i];
+		send_data(data);
+    }
+}
+
+void ssd1306_puts(const char* str) 
+{
+    while (*str != 0)
+        ssd1306_putc(*str++);
+}
+
+void ssd1306_clear_display()
+{
+	send_command(OLED_DISPLAY_OFF_CMD);//   display off
+	for (int j=0; j<8; j++) {
+		ssd1306_set_position(0,j); 
+		for (int i=0; i<16; i++)  //clear all columns
+			ssd1306_putc(' ');
+    }
+	send_command(OLED_DISPLAY_ON_CMD);    //display on
+	ssd1306_set_position(0,0);
+}
+
+int ssd1306_init()
+{
+	fd = open(I2C_BUS, O_RDWR);
+	if (fd < 0) {
+		printf("ERROR: unable to open i2c bus interface (%s)\n", I2C_BUS);
+		return -1;
+	}
+	if (ioctl(fd, I2C_SLAVE, OLED_ADDR) < 0) { 
+		printf("ERROR: unable to access OLED as slave\n");
+		return -1;
+	}
+
+    for (unsigned i=0; i<ARRAY_OF(init_commands); i++) {
+        send_command (init_commands[i]);
+    }
+
+    ssd1306_clear_display();
+
+	return 0;
+}
+
+
+
diff --git a/src/07_miniproj/oled/ssd1306.h b/src/07_miniproj/oled/ssd1306.h
new file mode 100644
index 0000000..e7b62a9
--- /dev/null
+++ b/src/07_miniproj/oled/ssd1306.h
@@ -0,0 +1,13 @@
+#pragma once
+#ifndef SSD1306_H
+#define SSD1306_H
+
+#include <stdint.h>
+
+int  ssd1306_init();
+void ssd1306_set_position (uint32_t column, uint32_t row);
+void ssd1306_putc(char c);
+void ssd1306_puts(const char* str);
+void ssd1306_clear_display();
+
+#endif
\ No newline at end of file