带显示屏指示的流水灯设计

第一步--熟悉硬件

流水灯的原理图是这样的

LCD的接口是这样的

我在这里突然发现了一个问题，就是LED和LCD怎么有公用的端口！！但是我仔细一看发现，这LED是由一个锁存器控制，LCD的控制芯片有一个CS片选信号，感觉这个是控制着两个模块的使能的，那么不同时向LED和LCD写数据不就行了？

所以控制思路也就有了，在向LCD写数据的时候就使能LCD控制芯片，用完就失能它。这一步我发现给的例程已经做了。但LED可没有做，所以只能自己实现了，控制思路和LCD一样，用的时候使能，用完就失能。

第二步--软件设计

首先就是套用官方给的例程，有现成的不用岂不是浪费。然后初始化一下PD2口。下面就是PD2的初始化函数。

void LED_Enable_gpio_cofig(void)
{
  GPIO_InitTypeDef  GPIO_Strue;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE);
  GPIO_Strue.GPIO_Pin = GPIO_Pin_2;
  GPIO_Strue.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Strue.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOD, &GPIO_Strue);
  //先关了灯
  GPIO_SetBits(GPIOD, GPIO_Pin_2);
  GPIO_Write(GPIOC,0Xff00);
  GPIO_ResetBits(GPIOD, GPIO_Pin_2);
}

为了好记我把使能失能宏定义一下

#define LED_ENABLE()       GPIO_SetBits(GPIOD, GPIO_Pin_2)
#define LED_DISENABLE()    GPIO_ResetBits(GPIOD, GPIO_Pin_2)

延时函数就用例程带的。

建立一个流水灯数组

uint16_t led_buff[][8] = {0xfe00, 0xfd00, 0xfb00, 0xf700, 0xef00, 0xdf00, 0xbf00, 0x7f00,
                       0x7f00, 0xbf00, 0xdf00, 0xef00, 0xf700, 0xfb00, 0xfd00, 0xfe00,
               0x7e00, 0xbd00, 0xdb00, 0xe700, 0xe700, 0xc300, 0x8100, 0x0000,
               0xe700, 0xdb00, 0xbd00, 0x7e00, 0x7e00, 0x3c00, 0x1800, 0x0000};

最后的过程就很简单了看一下mian函数吧

int main(void)
{
  uint8_t i;
  SysTick_Config(SystemCoreClock/1000);
  //Delay_Ms(200);
  STM3210B_LCD_Init();
  LED_Enable_gpio_cofig();
  LCD_Clear(Black);
  LCD_SetBackColor(Black);
  LCD_SetTextColor(White);
  LCD_DisplayStringLine(Line1 ,(unsigned char *)"   Flowled test");
  LCD_SetBackColor(Yellow);
  LCD_DisplayStringLine(Line2 ,(unsigned char *)"Flowled mode 1 test.");  
  LCD_SetBackColor(Black);
  LCD_DisplayStringLine(Line3 ,(unsigned char *)"Flowled mode 2 test.");  
  LCD_SetBackColor(Black);
  LCD_DisplayStringLine(Line4 ,(unsigned char *)"Flowled mode 3 test.");  
  LCD_SetBackColor(Black);
  LCD_DisplayStringLine(Line5 ,(unsigned char *)"Flowled mode 4 test.");  
  LED_ENABLE();
  for(i = 0; i < 8; i ++)
  {
    GPIO_Write(GPIOC,led_buff[0][i]);
    Delay_Ms(200);
  }
  GPIO_Write(GPIOC,0Xff00);
  LED_DISENABLE();


  LCD_SetBackColor(Black);
  LCD_DisplayStringLine(Line2 ,(unsigned char *)"Flowled mode 1 test.");  
  LCD_SetBackColor(Yellow);
  LCD_DisplayStringLine(Line3 ,(unsigned char *)"Flowled mode 2 test.");  
  LED_ENABLE();
  for(i = 0; i < 8; i ++)
  {
    GPIO_Write(GPIOC,led_buff[1][i]);
    Delay_Ms(200);
  }
  GPIO_Write(GPIOC,0Xff00);
  LED_DISENABLE();

  LCD_SetBackColor(Black);
  LCD_DisplayStringLine(Line3 ,(unsigned char *)"Flowled mode 2 test.");  
  LCD_SetBackColor(Yellow);
  LCD_DisplayStringLine(Line4 ,(unsigned char *)"Flowled mode 3 test.");  
  LED_ENABLE();
  for(i = 0; i < 8; i ++)
  {
    GPIO_Write(GPIOC,led_buff[2][i]);
    Delay_Ms(200);
  }
  GPIO_Write(GPIOC,0Xff00);
  LED_DISENABLE();

  LCD_SetBackColor(Black);
  LCD_DisplayStringLine(Line4 ,(unsigned char *)"Flowled mode 3 test.");  
  LCD_SetBackColor(Yellow);
  LCD_DisplayStringLine(Line5 ,(unsigned char *)"Flowled mode 4 test.");  
  LED_ENABLE();
  for(i = 0; i < 8; i ++)
  {
    GPIO_Write(GPIOC,led_buff[2][i]);
    Delay_Ms(200);
  }
  GPIO_Write(GPIOC,0Xff00);
  LED_DISENABLE();


  LCD_SetBackColor(Black);
  LCD_DisplayStringLine(Line5 ,(unsigned char *)"Flowled mode 4 test.");    
  LCD_SetBackColor(Green);
  LCD_DisplayStringLine(Line6 ,(unsigned char *)"Finshed!");  
  LCD_SetBackColor(Red);
  LCD_DisplayStringLine(Line7 ,(unsigned char *)"                   ");    
  while(1);
}