bool oled_ssd1306_setup(void)
setup OLED display
void oled_ssd1306_display(const uint8_t *display_data, uint16_t display_length)
send data to display to OLED display
void oled_ssd1306_on(void)
switch OLED display on
void oled_ssd1306_test(void)
test OLED display: switch entire screen on for a brief time
void oled_ssd1306_off(void)
switch OLED display off