STM32F103ZET6 ILI9341 做一个圆形（钟表）时钟显示（精英开发板V2）

 摘要：本文深入探究了利用 STM32 微控制器驱动 ILI9341 显示屏绘制时钟的技术方案。

在硬件连接方面，采用 FSMC（灵活静态存储控制器）接口，通过合理配置引脚，实现 STM32 与 ILI9341 的高速稳定通信，确保数据能够快速准确地传输至显示屏。

时间获取借助延时函数，通过精确设定延时参数，实现对秒、分、时等时间单位的计数，为时钟绘制提供准确的时间基准。

时钟显示的流畅性则依赖于 STM32 芯片的高速处理能力，其能够快速完成时间数据的运算与图形绘制指令的生成。同时，优化 ILI9341 的屏幕刷新速度，通过调整显示缓存及刷新频率，减少画面卡顿现象。

源代码如下：

#include "./SYSTEM/sys/sys.h"
#include "./SYSTEM/usart/usart.h"
#include "./SYSTEM/delay/delay.h"
#include "./BSP/LED/led.h"
#include "./BSP/LCD/lcd.h"
#include "math.h"

int main(void)
{
    uint8_t x = 0;
    uint8_t lcd_id[12];
	uint16_t xx = 0;
	uint16_t y = 0;
	uint8_t time_minutes = 30;
	uint8_t time_hour = 5;
    HAL_Init();                                         
    sys_stm32_clock_init(RCC_PLL_MUL9);                 
    delay_init(72);                                     
    usart_init(115200);                                 
    led_init();                                         
    lcd_init();                                         
    g_point_color = RED;
    sprintf((char *)lcd_id, "LCD ID:%04X", lcddev.id);  

    while (1)
    {
        switch (0)
        {
        case 0:
            lcd_clear(WHITE);
            break;

        case 1:
            lcd_clear(BLACK);
            break;

        case 2:
            lcd_clear(BLUE);
            break;

        case 3:
            lcd_clear(RED);
            break;

        case 4:
            lcd_clear(MAGENTA);
            break;

        case 5:
            lcd_clear(GREEN);
            break;

        case 6:
            lcd_clear(CYAN);
            break;

        case 7:
            lcd_clear(YELLOW);
            break;

        case 8:
            lcd_clear(BRRED);
            break;

        case 9:
            lcd_clear(GRAY);
            break;

        case 10:
            lcd_clear(LGRAY);
            break;

        case 11:
            lcd_clear(BROWN);
            break;
        }

        lcd_show_string(10, 40, 240, 32, 32, "STM32", RED);
        lcd_show_string(10, 80, 240, 24, 24, "TFTLCD TIME CLOCK TEST", RED);
        x++;

        if (x == 12)
            x = 0;

				

			for(int time_t1 = 0;time_t1<=60;time_t1++){
				
				xx = (int)(72*sin(((float)time_t1*6.0)/360.0*3.14*2));
				y = (int)(72*cos(((float)time_t1*6.0)/360.0*3.14*2));
				lcd_draw_point(xx+100, y+200, 0x1234);
				if(time_t1%5==0)
				lcd_show_num(xx+100-10, y+200-5, (time_t1/5), 2, 16, RED);
			}
			for(int time_t1 = 0;time_t1<=60;time_t1++){
				HAL_Delay(1000);
				
				if(time_t1>=60)
				time_minutes++;
				
				if(time_minutes>=60){
					time_hour++;
					
					if(time_hour>=60){
							time_hour = 0;
						}
					time_minutes = 0;
					
				}
	
				for(int ii = 0;ii<51;ii++){
					xx = -(int)(ii*sin(((float)(time_hour-1)*6.0)/360.0*3.14*2));
					y = (int)(ii*cos(((float)(time_hour-1)*6.0)/360.0*3.14*2));	
					lcd_draw_point(xx+100, y+200, 0xffff);					
				}	
				
				for(int ii = 0;ii<51;ii++){
					xx = -(int)(ii*sin(((float)time_hour*6.0)/360.0*3.14*2));
					y = (int)(ii*cos(((float)time_hour*6.0)/360.0*3.14*2));	
					lcd_draw_point(xx+100, y+200, 0x1234);					
				}	
					
				for(int ii = 0;ii<72;ii++){
					xx = -(int)(ii*sin(((float)(time_t1-1)*6.0)/360.0*3.14*2));
				  y = (int)(ii*cos(((float)(time_t1-1)*6.0)/360.0*3.14*2));	
					lcd_draw_point(xx+100, y+200, 0xffff);					
				}	
				
				for(int ii = 0;ii<72;ii++){
					xx = -(int)(ii*sin(((float)time_t1*6.0)/360.0*3.14*2));
				  y = (int)(ii*cos(((float)time_t1*6.0)/360.0*3.14*2));	
					lcd_draw_point(xx+100, y+200, 0x1234);					
				}
				
				for(int ii = 0;ii<56;ii++){
					xx = -(int)(ii*sin(((float)(time_minutes-1)*6.0)/360.0*3.14*2));
				  y = (int)(ii*cos(((float)(time_minutes-1)*6.0)/360.0*3.14*2));	
					lcd_draw_point(xx+100, y+200, 0xffff);					
				}	
				
				for(int ii = 0;ii<56;ii++){
					xx = -(int)(ii*sin(((float)time_minutes*6.0)/360.0*3.14*2));
				  y = (int)(ii*cos(((float)time_minutes*6.0)/360.0*3.14*2));	
					lcd_draw_point(xx+100, y+200, 0x1234);					
				}				

			}
        LED0_TOGGLE(); 
        delay_ms(1000);
    }
}

效果如下，觉得时钟样式不够好，可以自己慢慢调整：