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-rw-r--r--libmaple/timers.c58
-rw-r--r--libmaple/timers.h2
2 files changed, 55 insertions, 5 deletions
diff --git a/libmaple/timers.c b/libmaple/timers.c
index daf8b51..68fda08 100644
--- a/libmaple/timers.c
+++ b/libmaple/timers.c
@@ -153,10 +153,55 @@ void timer_init(uint8 timer_num, uint16 prescale) {
timer->CR1 |= 1; // Enable timer
}
+// Stops the counter; the mode and settings are not modified
+void timer_pause(uint8 timer_num) {
+ Timer *timer;
+ ASSERT(timer_num > 0 && timer_num <= 4);
+
+ switch(timer_num) {
+ case 1:
+ timer = (Timer*)TIMER1_BASE;
+ break;
+ case 2:
+ timer = (Timer*)TIMER2_BASE;
+ break;
+ case 3:
+ timer = (Timer*)TIMER3_BASE;
+ break;
+ case 4:
+ timer = (Timer*)TIMER4_BASE;
+ break;
+ }
+ timer->CR1 &= ~(0x0001); // CEN
+}
+
+// Starts the counter; the mode and settings are not modified
+void timer_resume(uint8 timer_num) {
+ Timer *timer;
+ ASSERT(timer_num > 0 && timer_num <= 4);
+
+ switch(timer_num) {
+ case 1:
+ timer = (Timer*)TIMER1_BASE;
+ break;
+ case 2:
+ timer = (Timer*)TIMER2_BASE;
+ break;
+ case 3:
+ timer = (Timer*)TIMER3_BASE;
+ break;
+ case 4:
+ timer = (Timer*)TIMER4_BASE;
+ break;
+ }
+ timer->CR1 |= 0x0001; // CEN
+}
+
// This function sets the counter value via register for the specified timer.
// Can't think of specific usecases except for resetting to zero but it's easy
// to implement and allows for "creative" programming
-void timer_set_count(uint8 timer_num, uint16 value) { Timer *timer;
+void timer_set_count(uint8 timer_num, uint16 value) {
+Timer *timer;
ASSERT(timer_num > 0 && timer_num <= 4);
switch(timer_num) {
@@ -249,7 +294,6 @@ void timer_set_reload(uint8 timer_num, uint16 max_reload) {
// calls to timer_set_mode
void timer_disable_all(void) {
// Note: this must be very robust because it gets called from, eg, ASSERT
- // TODO: rewrite?
Timer *timer;
Timer *timers[4] = { (Timer*)TIMER1_BASE,
(Timer*)TIMER2_BASE,
@@ -293,18 +337,22 @@ void timer_set_mode(uint8 timer_num, uint8 channel, uint8 mode) {
case 1:
timer->DIER &= ~(1 << channel); // 1-indexed compare nums
timer->CCER &= ~(0x1);
+ timer_detach_interrupt(timer_num, channel);
break;
case 2:
timer->DIER &= ~(1 << channel); // 1-indexed compare nums
timer->CCER &= ~(0x10);
+ timer_detach_interrupt(timer_num, channel);
break;
case 3:
timer->DIER &= ~(1 << channel); // 1-indexed compare nums
timer->CCER &= ~(0x100);
+ timer_detach_interrupt(timer_num, channel);
break;
case 4:
timer->DIER &= ~(1 << channel); // 1-indexed compare nums
timer->CCER &= ~(0x1000);
+ timer_detach_interrupt(timer_num, channel);
break;
default:
ASSERT(0);
@@ -375,7 +423,6 @@ void timer_set_mode(uint8 timer_num, uint8 channel, uint8 mode) {
ASSERT(0);
}
break;
- // TODO: others
default:
ASSERT(0);
}
@@ -385,8 +432,9 @@ void timer_set_mode(uint8 timer_num, uint8 channel, uint8 mode) {
void timer_set_compare_value(uint8 timer_num, uint8 compare_num, uint16 value) {
// The faster version of this function is the inline timer_pwm_write_ccr
- Timer *timer; TimerCCR *timer_ccr; ASSERT(timer_num > 0 && timer_num <= 4
- && compare_num > 0 && compare_num <= 4);
+ Timer *timer; TimerCCR *timer_ccr;
+ ASSERT(timer_num <= 4 && timer_num > 0 &&
+ compare_num > 0 && compare_num <= 4);
switch(timer_num) {
case 1:
diff --git a/libmaple/timers.h b/libmaple/timers.h
index bcbd751..c48ef42 100644
--- a/libmaple/timers.h
+++ b/libmaple/timers.h
@@ -130,6 +130,8 @@ void timer_init(uint8, uint16);
void timer_disable_all(void);
uint16 timer_get_count(uint8);
void timer_set_count(uint8,uint16);
+void timer_pause(uint8);
+void timer_resume(uint8);
void timer_set_prescaler(uint8 timer_num, uint16 prescale);
void timer_set_reload(uint8 timer_num, uint16 max_reload);
void timer_set_mode(uint8 timer_num, uint8 compare_num, uint8 mode);