LED寄存器读写的问题~

Question

BOARD:S3C2410_V4          KERNEL:KERNEL-2.6.8.1

LED寄存器读写的问题
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的最底两位,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");

此模块insmod时就将 LED熄灭了, 可我把底2位值改为,00时也没见它再亮啊.
问题:pREG = 0x155555 它的寄存器位设置就是转化2进制对位的设置 10101010101010101吧?
问题:GPBCON 有没有大小端的说法? 我要把它的状态改变是否把最底2位变为00 就可以把灯再点亮呢?

基础差.含涵~

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

Answer 1

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,如果需要完整版聯系我

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

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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);
9.     // Configuration
10.     ConfigurePit();
11.     ConfigureTc();
12.     ConfigureButtons();
13.     ConfigureLeds();
14.    
15.     // Main loop
16.     while (1) {
18.         // Wait for LED to be active
19.         while (!pLedStates[0]);
21.         // Toggle LED state if active
22.         if (pLedStates[0]) {
23.             LED_Toggle(0);
24.             printf("1 ");
25.         }
27.         // Wait for 500ms
28.         Wait(500);
29.     }
30. }

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