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Tidy up atomicity in timer.c and ring_buffer.h

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Adopt the macros for saving/restoring the interrupt state
that are provided by the avr gcc environment.

Removing intialization of the timer value; this shaves off
a few bytes because globals are default initialized to zero.
This commit is contained in:
Wez Furlong 2016-11-27 22:41:22 -08:00
parent 1585fc4b61
commit be4e75423a
2 changed files with 28 additions and 34 deletions
Download patch file Download diff file Expand all files Collapse all files

36
tmk_core/common/avr/timer.c
View file

@ -17,6 +17,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/atomic.h>
#include <stdint.h>
#include "timer_avr.h"
#include "timer.h"
@ -24,7 +25,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
// counter resolution 1ms
// NOTE: union { uint32_t timer32; struct { uint16_t dummy; uint16_t timer16; }}
volatile uint32_t timer_count = 0;
volatile uint32_t timer_count;
void timer_init(void)
{
@ -52,10 +53,9 @@ void timer_init(void)
inline
void timer_clear(void)
{
uint8_t sreg = SREG;
cli();
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
timer_count = 0;
SREG = sreg;
}
}
inline
@ -63,10 +63,9 @@ uint16_t timer_read(void)
{
uint32_t t;
uint8_t sreg = SREG;
cli();
t = timer_count;
SREG = sreg;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
t = timer_count;
}
return (t & 0xFFFF);
}
@ -76,10 +75,9 @@ uint32_t timer_read32(void)
{
uint32_t t;
uint8_t sreg = SREG;
cli();
t = timer_count;
SREG = sreg;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
t = timer_count;
}
return t;
}
@ -89,10 +87,9 @@ uint16_t timer_elapsed(uint16_t last)
{
uint32_t t;
uint8_t sreg = SREG;
cli();
t = timer_count;
SREG = sreg;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
t = timer_count;
}
return TIMER_DIFF_16((t & 0xFFFF), last);
}
@ -102,10 +99,9 @@ uint32_t timer_elapsed32(uint32_t last)
{
uint32_t t;
uint8_t sreg = SREG;
cli();
t = timer_count;
SREG = sreg;
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
t = timer_count;
}
return TIMER_DIFF_32(t, last);
}