微處理器 - STCmicro STC15W4K56S4 - C/C++ - 0.91" OLED 128x32 SSD1306

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main.c

#include "stc15w4k56s4.h"

#define I2C_SDA   P01
#define I2C_SCL   P00

#define SSD1306_ADDRESS             0x78
#define SSD1306_LCDWIDTH            128
#define SSD1306_LCDHEIGHT           32
#define SSD1306_SETCONTRAST         0x81
#define SSD1306_DISPLAYALLOW_RESUME 0xA4
#define SSD1306_DISPLAYALLOW        0xA5
#define SSD1306_NORMALDISPLAY       0xA6
#define SSD1306_INVERTDISPLAY       0xA7
#define SSD1306_DISPLAYOFF          0xAE
#define SSD1306_DISPLAYON           0xAF
#define SSD1306_SETDISPLAYOFFSET    0xD3
#define SSD1306_SETCOMPINS          0xDA
#define SSD1306_SETVCOMDETECT       0xDB
#define SSD1306_SETDISPLAYCLOCKDIV  0xD5
#define SSD1306_SETPRECHARGE        0xD9
#define SSD1306_SETMULTIPLEX        0xA8
#define SSD1306_SETLOWCOLUMN        0x00
#define SSD1306_SETHIGHCOLUMN       0x10
#define SSD1306_SETSTARTLINE        0x40
#define SSD1306_MEMORYMODE          0x20
#define SSD1306_COLUMNADDR          0x21
#define SSD1306_PAGEADDR            0x22
#define SSD1306_COMSCANINC          0xC0
#define SSD1306_COMSCANDEC          0xC8
#define SSD1306_SEGREMAP            0xA0
#define SSD1306_CHARGEPUMP          0x8D
#define SSD1306_EXTERNALVCC         0x01
#define SSD1306_SWITCHCAPVCC        0x02

void delay(unsigned cnt)
{
    while(cnt--) {
    }
}

void i2c_start(void)
{
    I2C_SDA = 1;
    I2C_SCL = 1;
    delay(10);
    I2C_SDA = 0;
    delay(10);
    I2C_SCL = 0;
}

void i2c_stop(void)
{
    delay(10);
    I2C_SDA = 0;
    delay(10);
    I2C_SCL = 1;
    delay(10);
    I2C_SDA = 1;
}

unsigned char i2c_write(unsigned char val)
{
    unsigned char i = 9;
    unsigned char ack = 0;

    while (--i) {
        delay(10);
        I2C_SDA = (val & 0x80) ? 1 : 0;
        delay(10);
        I2C_SCL = 1;
        delay(10);
        val <<= 1;
        I2C_SCL = 0;
    }
    delay(10);
    I2C_SDA = 1;
    delay(10);
    I2C_SCL = 1;
    delay(10);
    ack = I2C_SDA;
    delay(10);
    I2C_SCL = 0;

    return ack;
}

unsigned char i2c_read(unsigned char ack)
{
    unsigned char i = 9;
    unsigned char val = 0;

    while (--i) {
        val <<= 1;
        delay(10);
        I2C_SCL = 1;
        delay(10);
        val |= I2C_SDA;
        delay(10);
        I2C_SCL = 0;
    }
    delay(10);
    I2C_SDA = ack;
    delay(10);
    I2C_SCL = 1;
    delay(10);
    I2C_SCL = 0;

    return val;
}

void i2c_write_byte(unsigned char saddr, unsigned char raddr, unsigned char val)
{
    unsigned char i = 10;

    while (--i) {
        i2c_start();
        if (i2c_write(saddr)) {
            continue;
        }
        if (i2c_write(raddr)) {
            continue;
        }
        if (i2c_write(val)) {
            continue;
        }
        i2c_stop();
        break;
    }
}

unsigned char i2c_read_byte(unsigned char saddr, unsigned char raddr)
{
    unsigned char i = 10;
    unsigned char value = 0;

    while (--i) {
        i2c_start();
        if (i2c_write(saddr & 0xfe)) {
            continue;
        }
        if (i2c_write(raddr)) {
            continue;
        }
        i2c_start();
        if (i2c_write(saddr | 1)) {
            continue;
        }
        value = i2c_read(1);
        i2c_stop();
        break;
    }
    return value;
}

void gpio_init(void)
{
    P0M0 = 0x00;
    P0M1 = 0x00;
    P1M0 = 0x00;
    P1M1 = 0x00;
    P2M0 = 0x00;
    P2M1 = 0x00;
    P3M0 = 0x00;
    P3M1 = 0x00;
    P4M0 = 0x00;
    P4M1 = 0x00;
}

void ssd1306_cmd(unsigned char c)
{
    i2c_start();
    i2c_write(SSD1306_ADDRESS);
    i2c_write(0x00);
    i2c_write(c);
    i2c_stop();
}

void ssd1306_data(unsigned char c)
{
    i2c_start();
    i2c_write(SSD1306_ADDRESS);
    i2c_write(0x40);
    i2c_write(c);
    i2c_stop();
}

void ssd1306_init(void)
{
    ssd1306_cmd(SSD1306_DISPLAYOFF);
    ssd1306_cmd(SSD1306_SETDISPLAYCLOCKDIV);
    ssd1306_cmd(0x80);
    ssd1306_cmd(SSD1306_SETMULTIPLEX);
    ssd1306_cmd(0x1F);
    ssd1306_cmd(SSD1306_SETDISPLAYOFFSET);
    ssd1306_cmd(0x00);
    ssd1306_cmd(SSD1306_SETSTARTLINE);
    ssd1306_cmd(SSD1306_CHARGEPUMP);
    ssd1306_cmd(0x14);
    ssd1306_cmd(SSD1306_MEMORYMODE);
    ssd1306_cmd(0x00);
    ssd1306_cmd(SSD1306_SEGREMAP | 0x01);
    ssd1306_cmd(SSD1306_COMSCANDEC);
    ssd1306_cmd(SSD1306_SETCOMPINS);
    ssd1306_cmd(0x02);
    ssd1306_cmd(SSD1306_SETCONTRAST);
    ssd1306_cmd(0x8F);
    ssd1306_cmd(SSD1306_SETPRECHARGE);
    ssd1306_cmd(0xF1);
    ssd1306_cmd(SSD1306_SETVCOMDETECT);
    ssd1306_cmd(0x40);
    ssd1306_cmd(SSD1306_DISPLAYALLOW_RESUME);
    ssd1306_cmd(SSD1306_NORMALDISPLAY);
    ssd1306_cmd(SSD1306_DISPLAYON);
}

void ssd1306_set_col_addr(void)
{
    ssd1306_cmd(SSD1306_COLUMNADDR);
    ssd1306_cmd(0);
    ssd1306_cmd(SSD1306_LCDWIDTH-1);
}

void ssd1306_set_page_addr(void)
{
    ssd1306_cmd(SSD1306_PAGEADDR);
    ssd1306_cmd(0);
    ssd1306_cmd((SSD1306_LCDHEIGHT/8)-1);
}

void main(void)
{
    unsigned int i = 0;
    unsigned int col = 0;

    gpio_init();
    AUXR |= 0x80;

    ssd1306_init();

    while (1) {
        ssd1306_set_col_addr();
        ssd1306_set_page_addr();
         
        i2c_start();
        i2c_write(SSD1306_ADDRESS);
        i2c_write(0x40);
        for (i = 0; i < 512; i++) {
            i2c_write(0xff);
        }
        i2c_stop();
    }
}

Makefile

all:
	sdcc main.c
	packihx main.ihx > main.hex

flash:
	sudo stcgal -p /dev/ttyO2 -P stc15 -o clock_source=external main.hex

clean:
	rm -rf main.ihx main.lst main.mem main.rst main.lk main.map main.rel main.sym main.hex

完成