LED寄存器讀寫的問題~

jn200002

BOARD:S3C2410_V4          KERNEL:KERNEL-2.6.8.1

LED寄存器讀寫的問題
pREG = ioremap(0x56000010, 0x20);           //GPBCON 地址56000010
printk("Virtual addr base = 0x%lx\n", (unsigned long)pREG);
tmp = * (volatile unsigned long *)pREG;
printk("GPBCON = 0x%lx\n", tmp);
tmp = * (volatile unsigned long *)(pREG + 1);
printk("GPBDAT = 0x%lx\n", tmp);
printk("Seting LED Test Driver...\n");
//GPB0是GPBCON的最底兩位,led接GPB0  00:IN 01:OUT
* (volatile unsigned long *)pREG = 0x155555;//0101010101010101010101 GPBCON共22位
* (volatile unsigned long *)(pREG + 1) = 0xfff;
tmp = * (volatile unsigned long *)pREG;
printk("GPBCON = 0x%lx\n", tmp);
tmp = * (volatile unsigned long *)(pREG + 1);
printk("GPBDAT = 0x%lx\n", tmp);
printk("LED Test Driver initiated.\n");

此模塊insmod時就將 LED熄滅了, 可我把底2位值改為,00時也沒見它再亮啊.
問題:pREG = 0x155555 它的寄存器位設(shè)置就是轉(zhuǎn)化2進(jìn)制對位的設(shè)置 10101010101010101吧?
問題:GPBCON 有沒有大小端的說法? 我要把它的狀態(tài)改變是否把最底2位變?yōu)?0 就可以把燈再點(diǎn)亮呢?

基礎(chǔ)差.含涵~

[ 本帖最后由 jn200002 于 2008-6-20 14:59 編輯 ]

bitmilong

jn兄寫的好亂啊


給你摘了一段Atmel的LED測試程序,你參考一下,如果需要完整版聯(lián)系我

1. unsigned char LED_Toggle(unsigned int led)
   
2. {
   
3. #ifdef PINS_LEDS
   
4.     // Check if LED exists
   
5.     if (led >= numLeds) {
   
6. 
   
7.         return 0;
   
8.     }
   
9. 
   
10.     // Toggle LED
    
11.     if (PIO_GetOutputDataStatus(&pinsLeds[led])) {
    
12. 
    
13.         PIO_Clear(&pinsLeds[led]);
    
14.     }
    
15.     else {
    
16. 
    
17.         PIO_Set(&pinsLeds[led]);
    
18.     }
    
19. 
    
20.     return 1;
    
21. #else
    
22.     return 0;
    
23. #endif
    
24. }

復(fù)制代碼

1. 
   
2. int main()
   
3. {
   
4.     PIO_Configure(pPins, PIO_LISTSIZE(pPins));
   
5.     DBGU_Configure(DBGU_STANDARD, 115200, BOARD_MCK);
   
6.     printf("-- Getting Started Project 1.4 --\n\r");
   
7.     printf("Board : %s, Chip ID : 0x%08X\n\r", BOARD_NAME, AT91C_BASE_DBGU->DBGU_CIDR);
   
8. 
   
9.     // Configuration
   
10.     ConfigurePit();
    
11.     ConfigureTc();
    
12.     ConfigureButtons();
    
13.     ConfigureLeds();
    
14.    
    
15.     // Main loop
    
16.     while (1) {
    
17. 
    
18.         // Wait for LED to be active
    
19.         while (!pLedStates[0]);
    
20. 
    
21.         // Toggle LED state if active
    
22.         if (pLedStates[0]) {
    
23.             LED_Toggle(0);
    
24.             printf("1 ");
    
25.         }
    
26. 
    
27.         // Wait for 500ms
    
28.         Wait(500);
    
29.     }
    
30. }

復(fù)制代碼