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/***********************************************************************
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* File: beep.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 buzzer on/off 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 BEEP 0 /*Buzzer us GPB0 */
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#define LED0 5
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#define DELAY_TIME 40000000
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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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GPBCON = (GPBCON|0x3)&0x1; /* Set GPB0 as GPIO output mode(0x01) */
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GPBUP &= ~1; /* Enable pullup resister */
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GPBDAT |= 0x560;
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while(1)
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{
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GPBDAT &= ~(1<<BEEP); /* Set Beep GPIO as low level */
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delay(DELAY_TIME);
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GPBDAT |= 1<<BEEP; /* Set Beep GPIO as high level */
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delay(DELAY_TIME);
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}
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}
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