# ST7567 I2C display driver
For esp-idf, same idea as the st7920 driver

## Usage

```c
i2c_master_bus_config_t bus_cfg = {
    .i2c_port = I2C_NUM_0,
    .sda_io_num = GPIO_NUM_21,
    .scl_io_num = GPIO_NUM_22,
    .clk_source = I2C_CLK_SRC_DEFAULT,
    .glitch_ignore_cnt = 7,
    .flags.enable_internal_pullup = true,
};
i2c_master_bus_handle_t bus;
i2c_new_master_bus(&bus_cfg, &bus);

st7567_config_t cfg = {
    .i2c_bus = bus,
    .i2c_addr = ST7567_I2C_ADDR_DEFAULT, // 0x3F,
    .i2c_clock_speed_hz = 400000,
    .contrast = 0x39,  // good for generic modules at 3.3v
};
st7567_device_t dev;
st7567_init(&cfg, &dev);
st7567_set_backlight(&dev, true);

st7567_draw_pixel(&dev, 10, 10);
st7567_update_screen(&dev);
```