[i=s] 本帖最后由 WoodData 于 2025-2-8 17:53 编辑 [/i]<br />
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STM32L562E-DK板载有一个240*240的彩色LCD屏，本次就来试试如何驱动LCD屏。
下面是LCD屏接口电路图。可以看到LCD屏使用了FMC接口。
首先打开STM32CubeMX，使用之前的工程模板。通过开发板方式新建的工程，其中已经自动包含了LCD屏的FMC接口IO配置。
下面接着设置FMC接口参数，参考bsp库的代码例子。
然后就是LCD接口的电源控制GPIO,复位引脚GPIO,背光控制GPIO设置。
设置之后就是生成代码工程了。
下面接着就是编写lcd屏的驱动代码了。首先就是LCD的初始化代码，这里参考BSP的驱动初始化。
读写LCD屏寄存器代码如下：
#define LCD_REGISTER_ADDR FMC_BANK1_1
#define LCD_DATA_ADDR (FMC_BANK1_1 | 0x00000002UL)
/**
* [@brief](home.php?mod=space&uid=247401) Reset ST7789H2 and activate backlight.
* @retval None.
*/
void ST7789H2_PowerUp(void)
{
/* Power on the ST7789H2 */
HAL_GPIO_WritePin(LCD_POWER_GPIO_PORT, LCD_POWER_GPIO_PIN, GPIO_PIN_RESET);
/* Reset the ST7789H2 */
HAL_GPIO_WritePin(LCD_RESET_GPIO_PORT, LCD_RESET_GPIO_PIN, GPIO_PIN_RESET);
HAL_Delay(1); /* wait at least 10us according ST7789H2 datasheet */
HAL_GPIO_WritePin(LCD_RESET_GPIO_PORT, LCD_RESET_GPIO_PIN, GPIO_PIN_SET);
HAL_Delay(120); /* wait maximum 120ms according ST7789H2 datasheet */
/* Enable backlight */
HAL_GPIO_WritePin(LCD_BACKLIGHT_GPIO_PORT, LCD_BACKLIGHT_GPIO_PIN, GPIO_PIN_SET);
}
/**
* [@brief](home.php?mod=space&uid=247401) Reset ST7789H2 and deactivate backlight.
* @retval BSP status.
*/
void ST7789H2_PowerDown(void)
{
/* Deactivate backlight */
HAL_GPIO_WritePin(LCD_BACKLIGHT_GPIO_PORT, LCD_BACKLIGHT_GPIO_PIN, GPIO_PIN_RESET);
/* Reset the ST7789H2 */
HAL_GPIO_WritePin(LCD_RESET_GPIO_PORT, LCD_RESET_GPIO_PIN, GPIO_PIN_RESET);
/* Power down the ST7789H2 */
HAL_GPIO_WritePin(LCD_POWER_GPIO_PORT, LCD_POWER_GPIO_PIN, GPIO_PIN_SET);
}
/**
* @brief Write 16bit values in registers of the device through BUS.
* @param DevAddr Device address on Bus.
* @param Reg The target register start address to write.
* @param pData Pointer to data buffer.
* @param Length Number of data.
* @retval BSP status.
*/
int32_t LCD_FMC_WriteReg16(uint16_t Reg, uint16_t *pData, uint16_t Length)
{
int32_t ret = 0;
uint32_t i = 0;
if ((pData == NULL) && (Length))
{
ret = 1;
}
else
{
/* Write register address */
*(__IO uint16_t *)LCD_REGISTER_ADDR = Reg;
while (i < Length)
{
/* Write register value */
*(__IO uint16_t *)LCD_DATA_ADDR = pData[i++];
}
}
return ret;
}
/**
* @brief Read 16bit values in registers of the device through BUS.
* @param DevAddr Device address on Bus.
* @param Reg The target register start address to read.
* @param pData Pointer to data buffer.
* @param Length Number of data.
* @retval BSP status.
*/
int32_t LCD_FMC_ReadReg16(uint16_t Reg, uint16_t *pData, uint16_t Length)
{
int32_t ret = 0;
uint32_t i = 0;
if ((pData == NULL) && (Length))
{
ret = 1;
}
else
{
/* Write register address */
*(__IO uint16_t *)LCD_REGISTER_ADDR = Reg;
while (i < Length)
{
pData[i++] = *(__IO uint16_t *)LCD_DATA_ADDR;
}
}
return ret;
}
/**
* @brief Send 16bit values to device through BUS.
* @param pData Pointer to data buffer.
* @param Length Number of data.
* @retval BSP status.
*/
int32_t LCD_FMC_SendData(uint16_t *pData, uint32_t Length)
{
int32_t ret = 0;
uint32_t i = 0;
if ((pData == NULL) && (Length))
{
ret = 1;
}
else
{
while (i < Length)
{
/* Send value */
*(__IO uint16_t *)LCD_DATA_ADDR = pData[i ++];
}
}
return ret;
}
LCD初始化配置代码如下：
const uint16_t lcd_st7789h2_init_tbl[] =
{
ST7789H2_SLEEP_IN, (10<<8) +0, /* Sleep In Command */
ST7789H2_SW_RESET, (100<<8)+0, /* SW Reset Command */
ST7789H2_SLEEP_OUT, (100<<8)+0, /* Sleep Out Command */
ST7789H2_MADCTL, 1, 0x00, /* MY = 0, MX = 0, MV = 0 */
//0xA0; /* MY = 1, MX = 0, MV = 1 */
//0xC0; /* MY = 1, MX = 1, MV = 0 */
//0x60; /* MY = 0, MX = 1, MV = 1 */
ST7789H2_COLOR_MODE, 1, 0x05, //rgb565
ST7789H2_DISPLAY_INV_ON,0, /* Display inversion On */
ST7789H2_CASET, 4, 0x00,0x00,0x00,0xef, //0x00,0x50,0x01,0x3f, // /* Set Column address CASET */
ST7789H2_RASET, 4, 0x00,0x00,0x00,0xef, //0x00,0x50,0x01,0x3f, // /* Set Row address RASET */
ST7789H2_PORCH_CTRL, 5, 0x0c,0x0c,0x00,0x33,0x33, /* PORCH control setting */
ST7789H2_GATE_CTRL, 1, 0x35,
ST7789H2_VCOM_SET, 1, 0x1f, /* VCOM setting */
ST7789H2_LCM_CTRL, 1, 0x2c, /* LCM Control setting */
ST7789H2_VDV_VRH_EN, 2, 0x01,0xc3, /* VDV and VRH Command Enable */
ST7789H2_VDV_SET, 1, 0x20, /* VDV Set */
ST7789H2_FR_CTRL, 1, 0x0f, /* Frame Rate Control in normal mode */
ST7789H2_POWER_CTRL, 2, 0xa4,0xa1, /* Power Control */
ST7789H2_PV_GAMMA_CTRL, 14, 0xd0,0x08,0x11,0x08,0x0c,0x15,0x39,0x33,0x50,0x36,0x13,0x14,0x29,0x2d, /* Positive Voltage Gamma Control */
ST7789H2_NV_GAMMA_CTRL, 14, 0xd0,0x08,0x10,0x08,0x06,0x06,0x39,0x44,0x51,0x0b,0x16,0x14,0x2f,0x31, /* Negative Voltage Gamma Control */
ST7789H2_TE_LINE_ON, 1, 0x01, /* Tearing Effect Line On: Option (00h:VSYNC Interface OFF, 01h:VSYNC Interface ON) */
ST7789H2_DISPLAY_ON, 0,
0,
};
/**
* @brief Initialize the st7789h2 LCD component.
* @retval Component status.
*/
uint32_t ST7789H2_Init(void *args)
{
uint16_t * ptr;
uint16_t cmd_reg,data_len,t;
ST7789H2_PowerUp();
ptr = (uint16_t *)lcd_st7789h2_init_tbl;
cmd_reg = *ptr++;
while(cmd_reg)
{
data_len = *ptr++;
t = data_len >> 8;
data_len &= 0xff;
LCD_FMC_WriteReg16(cmd_reg,ptr,data_len);
if(t) HAL_Delay(t);
ptr += data_len;
cmd_reg = *ptr++;
}
return 0;
}
初始化需要注意：
要打开LCD电源GPIO控制，复位一下LCD引脚，接着打开背光GPIO。
再就是配置LCD寄存器时ST7789H2_SLEEP_IN，ST7789H2_SW_RESET，ST7789H2_SLEEP_OUT命令后要延时一下。
下面就是绘图，画点，填充函数：
int32_t ST7789H2_SetCursor(uint16_t Xs, uint16_t Ys, uint16_t Xe, uint16_t Ye)
{
uint16_t parameter[8];
parameter[0] = (Xs >> 8);
parameter[1] = (Xs & 0xff);
parameter[2] = (Xe >> 8);
parameter[3] = (Xe & 0xff);
LCD_FMC_WriteReg16(ST7789H2_CASET,parameter,4);
parameter[0] = (Ys >> 8);
parameter[1] = (Ys & 0xff);
parameter[2] = (Ye >> 8);
parameter[3] = (Ye & 0xff);
LCD_FMC_WriteReg16(ST7789H2_RASET,parameter,4);
LCD_FMC_WriteReg16(ST7789H2_WRITE_RAM,parameter,0);
return 0;
}
uint32_t ST7789H2_DrawBitmap (uint8_t mode, int16_t x, int16_t y, uint16_t w, uint16_t h, const uint8_t *bmp)
{
ST7789H2_SetCursor(x,y,x+w-1,y+h-1);
/* Write GRAM */
LCD_FMC_SendData((uint16_t *)bmp, w*h);
return 0;
}
uint32_t ST7789H2_DrawPixel (int16_t x, int16_t y, lcd_color_t color)
{
ST7789H2_SetCursor(x,y,x,y);
LCD_FMC_SendData((uint16_t *)&color, 1);
return 0;
}
uint32_t ST7789H2_Fill (int16_t x, int16_t y, uint16_t w, uint16_t h, lcd_color_t color)
{
volatile uint32_t i;
ST7789H2_SetCursor(x,y,x+w-1,y+h-1);
for(i=0;i<w*h;i++)
{
LCD_FMC_SendData((uint16_t *)&color, 1);
}
return 0;
}
之后就可以在LCD上绘图了。
实际下载效果如下：
附件：stm32l562_lcd.zip
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