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/***********************************************************************
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* File: led.c
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* Version: 1.0.0
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* Copyright: 2011 (c) Guo Wenxue <guowenxue@gmail.com>
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* Description: This C code used to turn LED0~LED4 on on FL2440 board
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* ChangeLog: 1, Release initial version on "Mon Mar 21 21:09:52 CST 2011"
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*
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***********************************************************************/
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#define GPBCON (*(unsigned long volatile *)0x56000010)
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#define GPBDAT (*(unsigned long volatile *)0x56000014)
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#define GPBUP (*(unsigned long volatile *)0x56000018)
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#define LED0 5 /*LED0 use GPB5*/
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#define LED1 6 /*LED1 use GPB6*/
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#define LED2 8 /*LED2 use GPB8*/
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#define LED3 10 /*LED3 use GPB10*/
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#define DELAY_TIME 20000000
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static inline void delay (unsigned long loops)
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{
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__asm__ volatile ("1:\n"
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"subs %0, %1, #1\n"
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"bne 1b":"=r" (loops):"0" (loops));
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}
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int main(void)
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{
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/* Set GPB5,GPB6,GPB8,GPB10 as GPIO mode(0x01) */
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GPBCON = (GPBCON|0x333C00)&0x111400;
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GPBUP = (GPBUP | 0x560);
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while(1)
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{
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/* Set GPB5,GPB6,GPB8,GPB10 as high level, to turn LED0,LED1,LED2,LED3 off */
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GPBDAT = (GPBDAT | 0x560);
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delay(DELAY_TIME);
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/* Turn LED0 on */
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GPBDAT = (GPBDAT & (~(1<<LED0)) );
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delay(DELAY_TIME);
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/* Turn LED1 on */
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GPBDAT = (GPBDAT & (~(1<<LED1)) );
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delay(DELAY_TIME);
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/* Turn LED2 on */
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GPBDAT = (GPBDAT & (~(1<<LED2)) );
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delay(DELAY_TIME);
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/* Turn LED3 on */
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GPBDAT = (GPBDAT & (~(1<<LED3)) );
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delay(DELAY_TIME);
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}
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}
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