mirror of
https://github.com/DanielBroad/AVCSniffer
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41 lines
1.2 KiB
C
Executable File
41 lines
1.2 KiB
C
Executable File
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#ifndef _delay_h_
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#define _delay_h_
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#include <inttypes.h>
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#include <avr/io.h>
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#include "const.h"
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/* delay function for microsec
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4 cpu cycles per loop + 1 cycles(?) overhead
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when a constant is passed. */
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static inline void delayloop16(uint16_t count)
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{
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asm volatile ( "cp %A0,__zero_reg__ \n\t" \
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"cpc %B0,__zero_reg__ \n\t" \
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"breq L_Exit_%= \n\t" \
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"L_LOOP_%=: \n\t" \
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"sbiw %0,1 \n\t" \
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"brne L_LOOP_%= \n\t" \
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"L_Exit_%=: \n\t" \
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: "=w" (count)
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: "0" (count)
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);
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}
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// delayloop16(x) eats 4 cycles per x
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#define DELAY_US_CONV(us) ((uint16_t)(((((us)*1000L)/(1000000000/F_CPU))-1)/4))
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#define delay_us(us) delayloop16(DELAY_US_CONV(us))
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/* delay function for millisec
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(6 cycles per x + 20(?) overhead) */
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void delayloop32( uint32_t l); // not inline
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#define DELAY_MS_CONV(ms) ( (uint32_t) (ms*(F_CPU/6000L)) )
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#define delay_ms(ms) delayloop32(DELAY_MS_CONV(ms))
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void delay1us(volatile u08 delay, u08 count);
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void delay1(u16 count);
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#endif
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