ST7789驱动
作者：互联网
1. 信号线设置
以正点原子的潘多拉IOT开发板为例，主要有有6条线：
- RESET：复位
- CS：片选
- DCX：数据/命令选择（正点原子的开发板将之标注为WR信号）
- SCK：SPI时钟线
- SDA：数据线
- PWR：LED背光
这种配置下，MCU只向ST7789写数据而不读取数据。
2. SPI配置要求
- 主模式，仅发送，8bit模式
- 时钟极性为高，第二个边沿（上升沿）latch
- 是种周期不要低于16ns
3. 关键函数介绍
3.1 需要根据硬件平台进行设置的函数
void st7789_cfg_pwr_set(void);
void st7789_cfg_pwr_reset(void);
void st7789_cfg_rst_set(void);
void st7789_cfg_delay_ms(uint32_t ms);
void st7789_cfg_rst_reset(void);
void st7789_cfg_cs_set(void);
void st7789_cfg_cs_reset(void);
void st7789_cfg_dcx_set(void);
void st7789_cfg_dcx_reset(void);
void st7789_cfg_spi_write(uint8_t *pbuf, uint16_t size);
3.2 与硬件平台无关的函数（仅与上述函数相关）
void st7789_on(void);
void st7789_off(void);
void st7789_init(void);
void st7789_set_address(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2);
void st7789_fill(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color);
void st7789_draw_pixel(uint16_t x, uint16_t y, uint16_t color);
后四个函数示例如下：
/**
* @brief Initialize the LCD.
* @param None.
* @retval None.
*/
void st7789_init(void)
{
/* Display on */
st7789_cfg_pwr_reset();
/* Reset. */
st7789_cfg_rst_reset();
st7789_cfg_delay_ms(200);
st7789_cfg_rst_set();
/* Sleep Out */
st7789_write_cmd(0x11);
/* Wait for power stability */
st7789_cfg_delay_ms(200);
/* Memory Data Access Control */
st7789_write_cmd(0x36);
st7789_write_data(0x00);
/* RGB 5-6-5-bit */
st7789_write_cmd(0x3A);
st7789_write_data(0x65);
/* Porch Setting */
st7789_write_cmd(0xB2);
st7789_write_data(0x0C);
st7789_write_data(0x0C);
st7789_write_data(0x00);
st7789_write_data(0x33);
st7789_write_data(0x33);
/* Gate Control */
st7789_write_cmd(0xB7);
st7789_write_data(0x35);
/* VCOM Setting */
st7789_write_cmd(0xBB);
st7789_write_data(0x19);
/* LCM Control */
st7789_write_cmd(0xC0);
st7789_write_data(0x2C);
/* VDV and VRH Command Enable */
st7789_write_cmd(0xC2);
st7789_write_data(0x01);
/* VRH Set */
st7789_write_cmd(0xC3);
st7789_write_data(0x12);
/* VDV Set */
st7789_write_cmd(0xC4);
st7789_write_data(0x20);
/* Frame Rate Control in Normal Mode */
st7789_write_cmd(0xC6);
st7789_write_data(0x0F);
/* Power Control 1 */
st7789_write_cmd(0xD0);
st7789_write_data(0xA4);
st7789_write_data(0xA1);
/* Positive Voltage Gamma Control */
st7789_write_cmd(0xE0);
st7789_write_data(0xD0);
st7789_write_data(0x04);
st7789_write_data(0x0D);
st7789_write_data(0x11);
st7789_write_data(0x13);
st7789_write_data(0x2B);
st7789_write_data(0x3F);
st7789_write_data(0x54);
st7789_write_data(0x4C);
st7789_write_data(0x18);
st7789_write_data(0x0D);
st7789_write_data(0x0B);
st7789_write_data(0x1F);
st7789_write_data(0x23);
/* Negative Voltage Gamma Control */
st7789_write_cmd(0xE1);
st7789_write_data(0xD0);
st7789_write_data(0x04);
st7789_write_data(0x0C);
st7789_write_data(0x11);
st7789_write_data(0x13);
st7789_write_data(0x2C);
st7789_write_data(0x3F);
st7789_write_data(0x44);
st7789_write_data(0x51);
st7789_write_data(0x2F);
st7789_write_data(0x1F);
st7789_write_data(0x1F);
st7789_write_data(0x20);
st7789_write_data(0x23);
/* Display Inversion On */
st7789_write_cmd(0x21);
/* Display on */
st7789_on();
st7789_fill(0, 0, _ST7789_WIDTH - 1, _ST7789_HEIGHT, 0xFFFF);
st7789_write_cmd(0x29);
}
/**
* @brief Set address to be edited.
* @param x1 [In]: start x.
* @param y1 [In]: start y.
* @param x2 [In]: end x.
* @param y2 [In]: end y.
* @retval None.
*/
void st7789_set_address(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2)
{
st7789_write_cmd(0x2a);
st7789_write_data(x1 >> 8);
st7789_write_data(x1);
st7789_write_data(x2 >> 8);
st7789_write_data(x2);
st7789_write_cmd(0x2b);
st7789_write_data(y1 >> 8);
st7789_write_data(y1);
st7789_write_data(y2 >> 8);
st7789_write_data(y2);
st7789_write_cmd(0x2C);
}
/**
* @brief Fill specified area with specified color.
* @param x1 [In]: start x.
* @param y1 [In]: start y.
* @param x2 [In]: end x.
* @param y2 [In]: end y.
* @param color [In]: color to be filled.
* @retval None.
*/
void st7789_fill(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint16_t color)
{
uint16_t size, r, i;
size = (x2 - x1 + 1) * (y2 - y1 + 1);
if (size > _ST7789_BUFFER_SIZE)
{
for (i = 0; i < _ST7789_BUFFER_SIZE; i++)
{
st7789_buffer[2 * i] = color >> 8;
st7789_buffer[2 * i + 1] = color;
}
}
else
{
for (i = 0; i < size; i++)
{
st7789_buffer[2 * i] = color >> 8;
st7789_buffer[2 * i + 1] = color;
}
}
r = size;
st7789_set_address(x1, y1, x2, y2);
st7789_cfg_dcx_set();
while (1)
{
if (r > _ST7789_BUFFER_SIZE)
{
st7789_cfg_spi_write(st7789_buffer, _ST7789_BUFFER_SIZE * 2);
r = r - _ST7789_BUFFER_SIZE;
}
else
{
st7789_cfg_spi_write(st7789_buffer, r * 2);
break;
}
}
}
/**
* @brief Draw specified pixel with specified color.
* @param x [In]: x of specified pixel.
* @param y [In]: y of specified pixel.
* @param color [In]: color to be filled.
* @retval None.
*/
void st7789_draw_pixel(uint16_t x, uint16_t y, uint16_t color)
{
uint8_t data[2];
data[0] = color >> 8;
data[1] = color;
st7789_set_address(x, y, x, y);
st7789_cfg_dcx_set();
st7789_cfg_spi_write(data, 2);
}
标签：cfg,void,write,st7789,uint16,ST7789,驱动,data 来源： https://www.cnblogs.com/xixizhk/p/15531272.html