GPIO

五块74HC595级联用来控制十八个双色led灯

发布于 2019-08-29 09:41:52 浏览：3161 订阅该版

在rt-thread上的驱动74HC595的芯片程序已经写好，可以发送数据来控制十八个led，但是有一个问题，就是我不知道发送什么样格式的数据才能控制这些灯一个一个的亮。
附上我写的接收程序。
> //2019.8.29 ¶ÁÈ¡NÆ¬74HC595µÄÊäÈëÊý¾Ý
//ChipNum:ÓÃ»§Ê¹ÓÃµÄ595¶Ë¿ÚÉÏÁ¬½ÓµÄÐ¾Æ¬¸öÊý
//ÔÚStm32µ¥Æ¬»úÖÐÊ¹ÓÃ
int ch595_led_write(int num,unsigned char ChipNum ,unsigned char * data)
{
   unsigned char i = 0;
    unsigned char DataBufTmp = 0;
   CH595_LED_RCLK1(0);
   CH595_LED_SCLK1(0);
   hardware_delay_us(100);
	for(; ChipNum>0; ChipNum--)
	{
   DataBufTmp = *data;
		rt_kprintf("ch595_led_write  = %x<br>",*data);
   for(i= 0;i< 8;i++)
   {
         if(DataBufTmp&0x80)
       {
           CH595_LED_SER1(1);
	
       }
       else
				{
           CH595_LED_SER1(0);
       }
       hardware_delay_us(10);
			 CH595_LED_SCLK1(1);
       hardware_delay_us(10);
			 CH595_LED_SCLK1(0);
       DataBufTmp<<=1;
   }
		 data++;
	}
	 
   CH595_LED_RCLK1(1);
   hardware_delay_us(100);
   CH595_LED_RCLK1(0);
   return 0;
}

以及发送测试程序
> static void ch595_led_write_entry(void *parameter)
{

int Led=0;
	int chn;
	unsigned char buff[5] ={0x00,0x00,0x00,0x00,0x00};
   // ch595_led_write(0,0xff);
    while(Led < 10000)
    {
			
       ch595_led_write(0,5,buff);
		for(Led = 0;Led < 5;Led ++)
			buff[Led]++;

rt_thread_delay(100);
    }
}
和芯片原理图

![微信截图_20190829094112.png](https://oss-club.rt-thread.org/uploads/201908/29/094149zf3f8ktxa3yt52ft.png)

8 个回答

hanlin 2019-08-29

这家伙很懒，什么也没写！

kuailedeluojie 2019-08-29

这家伙很懒，什么也没写！

zhs_sky 2019-08-30

这家伙很懒，什么也没写！

Charlie-Han 2019-08-31

这家伙很懒，什么也没写！

[i=s] 本帖最后由 Charlie-Han 于 2019-8-31 20:19 编辑 [/i]

int ch595_led_write(int num, unsigned char ChipNum, unsigned char * data)
{
        //num变量你在这里没有使用到，ChipNum表示芯片个数，data数组指针
        unsigned char i = 0;
        unsigned char DataBufTmp = 0;
   
        CH595_LED_RCLK1(0);
        CH595_LED_SCLK1(0);
   
        hardware_delay_us(100);
        for(; ChipNum > 0; ChipNum--) //上面传来5个
        {
                DataBufTmp = *data; 
                rt_kprintf("ch595_led_write  = %x\n",*data);
                for(i= 0; i< 8; i++)
                {
                        if(DataBufTmp & 0x 80)
                        {
                           CH595_LED_SER1(1);
                        
                        } else {
                           CH595_LED_SER1(0);
                        }
                        hardware_delay_us(10);
                        CH595_LED_SCLK1(1);
                        hardware_delay_us(10);
                        CH595_LED_SCLK1(0);
                        DataBufTmp <<= 1;
                }
                data++;
    }
         
        CH595_LED_RCLK1(1);
        hardware_delay_us(100);
        CH595_LED_RCLK1(0);
        
        return 0;
}

static void ch595_led_write_entry(void *parameter)
{
        int Led=0;
        int chn;
        unsigned char buff[5] ={0x00,0x00,0x00,0x00,0x00}; //5个字节 
        // ch595_led_write(0,0xff);
    while(Led < 10000)
    {
                        
                ch595_led_write(0, 5, buff);         //芯片5个，数组首地址传给 ch595_led_write，执行结束所有小灯点亮，低电平。ok的
                for(Led = 0; Led < 5; Led ++)
                                buff[Led]++;                         // buff[0]++,循环10000次？？？？看不懂
        rt_thread_delay(100);
    }
}