项目用到LCD显示信息，使用的屏幕是微雪电子的1.69寸IPS彩色LCD显示屏，分辨率是240×280分辨率，采用SPI接口驱动。驱动芯片是ST7789V2，模块使用到6个控制管脚：

LCD_DINLCD_CLKLCD_CSLCD_DCLCD_RSTLCD_BL

SPI 通信 MOSI 引脚 SPI 通信 CLK引脚 LCD 的片选引脚，低电平有效 LCD 的数据/命令引脚，低电平表示命令，高电平表示数据 LCD 的复位引脚，低电平有效 LCD 的背光引脚 根据开发板的原理图，选择合适的管脚：

使用STM32CubeMX配置SPI驱动过程如下：

背光管脚配置PWM输出，PA2定时器3通道1,

内部时钟，分频系数99，计数值999，则PWM频率为：100MHz/(99+1)/(999+1)=1KHz，

输出占空比百分值为：Pulse值/(999+1)

测试代码

include "image.h"

include "LCD_Test.h"

include "LCD_1in69.h"

include "Touch_Driver.h"

include "DEV_Config.h"

Touch_1IN69_XY XY; UBYTE flag = 0,flgh = 0; UWORD x,y,l = 0;

void LCD_1in69_test() { printf("LCD_1IN28_test Demo\r\n"); DEV_Module_Init();

printf("LCD1IN28 Init and Clear...\r\n"); LCD_1IN69_SetBackLight(1000); LCD_1IN69_Init(VERTICAL); LCD_1IN69_Clear(WHITE);

XY.mode = 0;
//if(Touch_1IN69_init(XY.mode) == true)
// printf("OK!\r\n"); // else // printf("NO!\r\n");

printf("Paint_NewImage\r\n");
Paint_NewImage(LCD_1IN69_WIDTH, LCD_1IN69_HEIGHT, 0, WHITE);

printf("Set Clear and Display Funtion\r\n");
Paint_SetClearFuntion(LCD_1IN69_Clear);
Paint_SetDisplayFuntion(LCD_1IN69_DrawPoint);
printf("Paint_Clear\r\n"); Paint_Clear(BLACK); Paint_Clear(RED); Paint_Clear(GREEN); Paint_Clear(BLUE);

Paint_Clear(BLACK); Paint_DrawString_EN(0, 90, "stm32wba55cg", &Font24, BLACK, RED); Paint_DrawString_EN(0, 120, "eepw bbs", &Font20, BLACK, GREEN); while(1);

Paint_ClearWindows(10,90,230,137,WHITE);
Paint_DrawString_EN(105, 100, "Up", &Font24, 0X647C, WHITE); /while(XY.Gesture != UP) { if (flag == TOUCH_IRQ) { XY.Gesture = I2C_Read_Byte(0x01); flag = TOUCH_DRAW; } DEV_Delay_ms(10); }/

Paint_ClearWindows(105,100,160,155,WHITE);
Paint_DrawString_EN(85, 100, "Down", &Font24, 0X647C, WHITE);
/while(XY.Gesture != Down) { if (flag == TOUCH_IRQ) { XY.Gesture = I2C_Read_Byte(0x01); flag = TOUCH_DRAW; }
DEV_Delay_ms(10);
}/

Paint_ClearWindows(85, 100,160,155,WHITE);
Paint_DrawString_EN(85, 100, "Left", &Font24, 0X647C, WHITE);
/while(XY.Gesture != LEFT) { if (flag == TOUCH_IRQ) { XY.Gesture = I2C_Read_Byte(0x01); flag = TOUCH_DRAW; }
DEV_Delay_ms(10);
}/

Paint_ClearWindows(85, 100,160,155,WHITE);
Paint_DrawString_EN(80, 100, "Right", &Font24, 0X647C, WHITE);
/while(XY.Gesture != RIGHT) { if (flag == TOUCH_IRQ) { XY.Gesture = I2C_Read_Byte(0x01); flag = TOUCH_DRAW; }
DEV_Delay_ms(10);
}/

Paint_ClearWindows(80, 100,165,160,WHITE);
Paint_DrawString_EN(47, 100, "Long Press", &Font20, 0X647C, WHITE);
/while(XY.Gesture != LONG_PRESS) { if (flag == TOUCH_IRQ) { XY.Gesture = I2C_Read_Byte(0x01); flag = TOUCH_DRAW; }
DEV_Delay_ms(10);
}/

Paint_ClearWindows(47, 100,200,155,WHITE);
Paint_DrawString_EN(35, 100, "Double Click", &Font20, 0X647C, WHITE);
while(XY.Gesture != DOUBLE_CLICK)
{
if (flag == TOUCH_IRQ)
{
XY.Gesture = I2C_Read_Byte(0x01);
flag = TOUCH_DRAW;
}
DEV_Delay_ms(10);
}

XY.mode = 1;
//Touch_1IN69_init(XY.mode);
Paint_ClearWindows(10,90,230,137,WHITE);
Paint_DrawPoint(120, 140, BLACK, DOT_PIXEL_2X2, DOT_FILL_AROUND);
while (1)
{
if (flag == TOUCH_IRQ)
{
Paint_DrawPoint(XY.x_point, XY.y_point, XY.color, DOT_PIXEL_2X2, DOT_FILL_AROUND);
}
}
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) { //if(GPIO_Pin & TP_INT_Pin) { if(XY.mode == 1) { flag = TOUCH_IRQ; //XY = Touch_1IN69_Get_Point(); } //else { flag = TOUCH_IRQ; } } }

效果：