u8g2/sys/rt-thread/examples/ssd1306_12864_4wire_sw_spi_example.cpp

#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <U8g2lib.h>

// You may reference Drivers/drv_gpio.c for pinout
// In u8x8.h #define U8X8_USE_PINS 

#define OLED_SPI_PIN_CLK                    5  // PA5
#define OLED_SPI_PIN_MOSI                   7  // PA7
#define OLED_SPI_PIN_RES                    2  // PA2
#define OLED_SPI_PIN_DC                     1  // PA1
#define OLED_SPI_PIN_CS                     0  // PA0

// Check https://github.com/olikraus/u8g2/wiki/u8g2setupcpp for all supported devices
static U8G2_SSD1306_128X64_NONAME_F_4W_SW_SPI u8g2(U8G2_R0,\
                                            /* clock=*/ OLED_SPI_PIN_CLK,\
                                            /* data=*/ OLED_SPI_PIN_MOSI,\
                                            /* cs=*/ OLED_SPI_PIN_CS,\
                                            /* dc=*/ OLED_SPI_PIN_DC,\
                                            /* reset=*/ OLED_SPI_PIN_RES);

static void u8g2_ssd1306_12864_4wire_sw_spi_example(int argc,char *argv[])
{
    u8g2.begin();
    u8g2.clearBuffer();                         // clear the internal memory
    u8g2.setFont(u8g2_font_6x13_tr);            // choose a suitable font
    u8g2.drawStr(1, 18, "U8g2 on RT-Thread");   // write something to the internal memory
    u8g2.sendBuffer();                          // transfer internal memory to the display
    u8g2.setFont(u8g2_font_unifont_t_symbols);
    u8g2.drawGlyph(112, 56, 0x2603 );
    u8g2.sendBuffer();
}
MSH_CMD_EXPORT(u8g2_ssd1306_12864_4wire_sw_spi_example, sw 4wire spi ssd1306 sample);