学步园

正常显示与关闭

代码：

#include <linux/init.h><br /> #include <linux/module.h><br /> #include <linux/kernel.h><br /> #define LED_OE 0x20<br /> #define LED_D 0x00<br /> #define LED_S0 0x10<br /> #define LED_S1 0x20<br /> #define LEDCS 0x04<br /> #define FLAG_OE 0x20350000<br /> #define FLAG_INER 0x20360000<br /> #define FLAG_B 0x20380000<br /> #define DATA_OUT 0x20390000<br /> #define led_enable *(volatile unsigned char *)(FLAG_OE)<br /> #define write_trig *(volatile unsigned short *)(FLAG_INER)<br /> #define disp_select *(volatile unsigned short *)(FLAG_B)<br /> #define data2disp *(volatile unsigned short *)(DATA_OUT)<br /> const unsigned int led_code[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66,<br /> 0x6d, 0x7d, 0x27, 0x7f, 0x6f};<br /> static inline void udelay(volatile int us)<br /> {<br /> volatile int i;<br /> while(us--)<br /> for(i = 30; i > 0; i--);<br /> }<br /> static inline void mdelay(volatile int ms)<br /> {<br /> while(ms--)<br /> {<br /> udelay(700);<br /> }<br /> }<br /> static void led_init(void)<br /> {<br /> led_enable = (0xff & (~LED_OE));<br /> //mdelay(1);<br /> }<br /> static inline void led_delet(void)<br /> {<br /> //led_enable |= LED_OE;<br /> led_enable = 0xff;<br /> }<br /> static void led_display(unsigned char led_num, unsigned char data)<br /> {<br /> printk(KERN_INFO "led_num:%d data:%d/n", led_num, data);<br /> switch(led_num)<br /> {<br /> case 1:<br /> disp_select = LED_D;<br /> break;<br /> case 2:<br /> disp_select = LED_S0;<br /> break;<br /> case 3:<br /> disp_select = LED_S1;<br /> break;<br /> default:<br /> printk("ERROR!/n");<br /> break;<br /> }<br /> data2disp = led_code[data];<br /> write_trig = 0x00;<br /> //mdelay(1000);<br /> write_trig = LEDCS;<br /> }</p> <p>static int __init sample_module_init(void)<br /> {<br /> printk(KERN_INFO "init led module /n");<br /> led_init();<br /> led_display(1, 1);<br /> mdelay(1000);<br /> led_display(2, 2);<br /> return 0;<br /> }</p> <p>static void __exit sample_module_cleanup(void)<br /> {<br /> printk(KERN_INFO "cleanup led module /n");<br /> led_display(3, 3);<br /> mdelay(1000);<br /> led_display(4, 4);<br /> led_delet();<br /> }</p> <p>module_init(sample_module_init);<br /> module_exit(sample_module_cleanup);<br /> MODULE_DESCRIPTION("sample module");<br /> MODULE_LICENSE("GPL");

小bug：该函数结束之后还是保存最后显示的数据，觉得还是CPLD硬件的问题，
1. led_display(1, 1);
2. led_display(2, 2);
3. led_display(3, 3);
1.2显示之后，执行显示3  ，1。2 都还是在显示的。类似的模块关卸载后重新加载之前的数还是会显示出来
当然在关闭在前对它们进行写0叫他们都不亮这样就看不出来了，知道了就好了问题不是太大，能正常显示和关闭是关键。