josh
/
Teacup_Firmware
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Clean up delay functions and rename them to be consistent with 

what was used before the inline delay approach was attempted.
This commit is contained in:
Jim McGee 2011-05-10 22:19:45 -07:00 committed by Michael Moon
parent 757e1258e2
commit 1059f27592
2 changed files with 46 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
delay.c
View File

@ -4,20 +4,33 @@
\brief Delay routines \brief Delay routines
*/ */
#include <util/delay_basic.h> //#include <util/delay_basic.h>
#include "watchdog.h" //#include "watchdog.h"
/// interruptable microsecond delay
/// does NOT call wd_reset
/// \param delay time in microseconds
void delay_us( uint16_t delay )
{
while (delay > (65536UL / (F_CPU / 4000000UL))) {
_delay_loop_2(65534); //
delay -= (65536L / (F_CPU / 4000000L));
}
_delay_loop_2( delay * (F_CPU / 4000000UL));
}
/// delay microseconds /// delay microseconds
/// \param delay time to wait in microseconds /// \param delay time to wait in microseconds
void delay_us(uint16_t delay) { void _delay(uint32_t delay) {
wd_reset(); wd_reset();
while (delay > (65536L / (F_CPU / 4000000L))) { while (delay > (65536L / (F_CPU / 4000000L))) {
_delay_loop_2(65534); // we use 65534 here to compensate for the time that the surrounding loop takes. TODO: exact figure needs tuning _delay_loop_2(65534); // we use 65534 here to compensate for the time that the surrounding loop takes. TODO: exact figure needs tuning
delay -= (65536L / (F_CPU / 4000000L)); delay -= (65536L / (F_CPU / 4000000L));
wd_reset(); wd_reset();
} }
_delay_loop_2(delay / (F_CPU / 4000000L)); _delay_loop_2(delay * (F_CPU / 4000000L));
wd_reset(); wd_reset();
} }

37
delay.h
View File

@ -3,28 +3,49 @@
#include <stdint.h> #include <stdint.h>
#include <util/delay_basic.h> #include <util/delay_basic.h>
#include "watchdog.h"
#define WAITING_DELAY 100 #define WAITING_DELAY 100
#if F_CPU < 4000000UL
#error Delay functions only work with F_CPU >= 4000000UL
#endif
// microsecond delay, does NOT reset WDT if feature enabled
void delay_us(uint16_t delay); void delay_us(uint16_t delay);
// microsecond delay, does reset WDT if feature enabled
void _delay(uint32_t delay);
// millisecond delay, does reset WDT if feature enabled
void _delay_ms(uint32_t delay); void _delay_ms(uint32_t delay);
// microsecond timer, does reset WDT if feature enabled
// 0 results in no real delay, but the watchdog
// reset is called if the feature is enabled
static void delay(uint32_t) __attribute__ ((always_inline)); static void delay(uint32_t) __attribute__ ((always_inline));
inline void delay(uint32_t d) { inline void delay(uint32_t d) {
if (d >= (65536L / (F_CPU / 4000000L))) { if (d > (65536L / (F_CPU / 4000000L))) {
delay_us(d); _delay(d);
}
else {
wd_reset();
if( d ) {
_delay_loop_2(d * (F_CPU / 4000000L));
wd_reset();
}
} }
else
_delay_loop_2(d * (F_CPU / 4000000L));
} }
// millisecond timer, does reset WDT if feature enabled
// 0 results in no real delay, but the watchdog
// reset is called if the feature is enabled
static void delay_ms(uint32_t) __attribute__ ((always_inline)); static void delay_ms(uint32_t) __attribute__ ((always_inline));
inline void delay_ms(uint32_t d) { inline void delay_ms(uint32_t d) {
if (d > 65) if (d > 65)
delay_ms(d); _delay_ms(d);
else else
delay_us(d * 1000); delay(d * 1000);
} }
#endif /* _DELAY_H */ #endif /* _DELAY_H */