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-rw-r--r--libmaple/timers.c84
-rw-r--r--libmaple/timers.h134
2 files changed, 143 insertions, 75 deletions
diff --git a/libmaple/timers.c b/libmaple/timers.c
index c369d1f..29aeeba 100644
--- a/libmaple/timers.c
+++ b/libmaple/timers.c
@@ -73,16 +73,20 @@ struct timer_dev timer_dev_table[] = {
/* This function should probably be rewriten to take (timer_num, mode)
* and have prescaler set elsewhere. The mode can be passed through to
* set_mode at the end */
-void timer_init(uint8 timer_num, uint16 prescale) {
+void timer_init(timer_dev_num timer_num, uint16 prescale) {
/* TODO: doesn't catch 6+7 */
- ASSERT((timer_num != TIMER6) && (timer_num != TIMER7));
timer_port *timer = timer_dev_table[timer_num].base;
uint8 is_advanced = 0;
- if((timer_num == TIMER1) || (timer_num == TIMER8)) {
+ if (timer_num == TIMER1) {
is_advanced = 1;
}
+#if NR_TIMERS >= 8
+ if (timer_num == TIMER8) {
+ is_advanced = 1;
+ }
+#endif
rcc_clk_enable(timer_dev_table[timer_num].rcc_dev_num);
@@ -125,48 +129,61 @@ void timer_init(uint8 timer_num, uint16 prescale) {
}
/* Stops the counter; the mode and settings are not modified */
-void timer_pause(uint8 timer_num) {
+void timer_pause(timer_dev_num timer_num) {
timer_port *timer = timer_dev_table[timer_num].base;
timer->CR1 &= ~(0x0001); // CEN
}
/* Starts the counter; the mode and settings are not modified */
-void timer_resume(uint8 timer_num) {
+void timer_resume(timer_dev_num timer_num) {
timer_port *timer = timer_dev_table[timer_num].base;
timer->CR1 |= 0x0001; // CEN
}
+/* Returns the current timer counter value. Probably very inaccurate
+ * if the counter is running with a low prescaler. */
+uint16 timer_get_count(timer_dev_num timer_num) {
+ timer_port *timer = timer_dev_table[timer_num].base;
+
+ return timer->CNT;
+}
+
/* 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) {
+void timer_set_count(timer_dev_num timer_num, uint16 value) {
timer_port *timer = timer_dev_table[timer_num].base;
timer->CNT = value;
}
-/* Returns the current timer counter value. Probably very inaccurate
- * if the counter is running with a low prescaler. */
-uint16 timer_get_count(uint8 timer_num) {
+/* Get the prescaler buffer value (remember, the actual prescaler
+ * doesn't get set until an update event). */
+uint16 timer_get_prescaler(timer_dev_num timer_num) {
timer_port *timer = timer_dev_table[timer_num].base;
-
- return timer->CNT;
+ return timer->PSC;
}
/* Sets the prescaler */
-void timer_set_prescaler(uint8 timer_num, uint16 prescale) {
+void timer_set_prescaler(timer_dev_num timer_num, uint16 prescale) {
timer_port *timer = timer_dev_table[timer_num].base;
timer->PSC = prescale;
}
+/* Get the reload value for the entire timer. */
+uint16 timer_get_reload(timer_dev_num timer_num) {
+ timer_port *timer = timer_dev_table[timer_num].base;
+ return timer->ARR;
+}
+
/* This sets the "reload" or "overflow" value for the entire timer. We
* should probably settle on either "reload" or "overflow" to prevent
* confusion? */
-void timer_set_reload(uint8 timer_num, uint16 max_reload) {
+void timer_set_reload(timer_dev_num timer_num, uint16 max_reload) {
timer_port *timer = timer_dev_table[timer_num].base;
timer->ARR = max_reload;
@@ -211,7 +228,7 @@ void timer_disable_all(void) {
}
/* Sets the mode of individual timer channels, including a DISABLE mode */
-void timer_set_mode(uint8 timer_num, uint8 channel, TimerMode mode) {
+void timer_set_mode(timer_dev_num timer_num, uint8 channel, TimerMode mode) {
timer_port *timer = timer_dev_table[timer_num].base;
ASSERT(channel >= 1);
@@ -286,18 +303,36 @@ void timer_set_mode(uint8 timer_num, uint8 channel, TimerMode mode) {
}
}
+uint16 timer_get_compare_value(timer_dev_num timer_num, uint8 channel_num) {
+ /* faster: just read TIMERx_CHy_CCR (see timers.h) */
+ ASSERT(channel_num > 0 && channel_num <= 4);
+ timer_port *timer = timer_dev_table[timer_num].base;
+ switch(channel_num) {
+ case 1:
+ return timer->CCR1;
+ case 2:
+ return timer->CCR2;
+ case 3:
+ return timer->CCR3;
+ case 4:
+ return timer->CCR4;
+ default: /* in case ASSERT is disabled */
+ return 0;
+ }
+}
+
/* This sets the compare value (aka the trigger) for a given timer
* channel */
-void timer_set_compare_value(uint8 timer_num,
- uint8 compare_num,
+void timer_set_compare_value(timer_dev_num timer_num,
+ uint8 channel_num,
uint16 value) {
+ ASSERT(channel_num > 0 && channel_num <= 4);
+
/* The faster version of this function is the inline
timer_pwm_write_ccr */
timer_port *timer = timer_dev_table[timer_num].base;
- ASSERT(compare_num > 0 && compare_num <= 4);
-
- switch(compare_num) {
+ switch(channel_num) {
case 1:
timer->CCR1 = value;
break;
@@ -315,7 +350,7 @@ void timer_set_compare_value(uint8 timer_num,
/* Stores a pointer to the passed usercode interrupt function and configures
* the actual ISR so that it will actually be called */
-void timer_attach_interrupt(uint8 timer_num,
+void timer_attach_interrupt(timer_dev_num timer_num,
uint8 compare_num,
voidFuncPtr handler) {
ASSERT(compare_num > 0 && compare_num <= 4);
@@ -327,7 +362,7 @@ void timer_attach_interrupt(uint8 timer_num,
nvic_irq_enable(timer_dev_table[timer_num].nvic_dev_num);
}
-void timer_detach_interrupt(uint8 timer_num, uint8 compare_num) {
+void timer_detach_interrupt(timer_dev_num timer_num, uint8 compare_num) {
ASSERT(compare_num > 0 && compare_num <= 4);
timer_port *timer = timer_dev_table[timer_num].base;
@@ -336,6 +371,13 @@ void timer_detach_interrupt(uint8 timer_num, uint8 compare_num) {
timer->DIER &= ~(1 << compare_num); // 1-indexed compare nums
}
+void timer_generate_update(timer_dev_num timer_num) {
+ /* cause update event by setting UG bit in EGR. updates prescaler
+ ratio etc. */
+ timer_port *timer = timer_dev_table[timer_num].base;
+ timer->EGR |= 0x1;
+}
+
/* The following are the actual interrupt handlers; 1 for each timer which must
* determine which actual compare value (aka channel) was triggered.
*
diff --git a/libmaple/timers.h b/libmaple/timers.h
index d180bab..1d929db 100644
--- a/libmaple/timers.h
+++ b/libmaple/timers.h
@@ -82,7 +82,7 @@
extern "C"{
#endif
-typedef volatile uint32* TimerCCR;
+typedef volatile uint16* TimerCCR;
#define TIMER1_BASE 0x40012C00
#define TIMER2_BASE 0x40000000
@@ -96,41 +96,43 @@ typedef volatile uint32* TimerCCR;
#define ARPE BIT(7) // Auto-reload preload enable
#define NOT_A_TIMER 0
-#define TIMER_CCR(NUM,CHAN) TIMER ## NUM ## _CH ## CHAN ## _CRR
+#define TIMER_CCR(NUM,CHAN) (TIMER ## NUM ## _CH ## CHAN ## _CRR)
-#define TIMER1_CH1_CCR TIMER1_BASE + 0x34
-#define TIMER1_CH2_CCR TIMER1_BASE + 0x38
-#define TIMER1_CH3_CCR TIMER1_BASE + 0x3C
-#define TIMER1_CH4_CCR TIMER1_BASE + 0x40
+/* Timers 1-4 are present on the entire STM32 line. */
-#define TIMER2_CH1_CCR TIMER2_BASE + 0x34
-#define TIMER2_CH2_CCR TIMER2_BASE + 0x38
-#define TIMER2_CH3_CCR TIMER2_BASE + 0x3C
-#define TIMER2_CH4_CCR TIMER2_BASE + 0x40
+#define TIMER1_CH1_CCR ((TimerCCR)(TIMER1_BASE + 0x34))
+#define TIMER1_CH2_CCR ((TimerCCR)(TIMER1_BASE + 0x38))
+#define TIMER1_CH3_CCR ((TimerCCR)(TIMER1_BASE + 0x3C))
+#define TIMER1_CH4_CCR ((TimerCCR)(TIMER1_BASE + 0x40))
-#define TIMER3_CH1_CCR TIMER3_BASE + 0x34
-#define TIMER3_CH2_CCR TIMER3_BASE + 0x38
-#define TIMER3_CH3_CCR TIMER3_BASE + 0x3C
-#define TIMER3_CH4_CCR TIMER3_BASE + 0x40
+#define TIMER2_CH1_CCR ((TimerCCR)(TIMER2_BASE + 0x34))
+#define TIMER2_CH2_CCR ((TimerCCR)(TIMER2_BASE + 0x38))
+#define TIMER2_CH3_CCR ((TimerCCR)(TIMER2_BASE + 0x3C))
+#define TIMER2_CH4_CCR ((TimerCCR)(TIMER2_BASE + 0x40))
-#define TIMER4_CH1_CCR TIMER4_BASE + 0x34
-#define TIMER4_CH2_CCR TIMER4_BASE + 0x38
-#define TIMER4_CH3_CCR TIMER4_BASE + 0x3C
-#define TIMER4_CH4_CCR TIMER4_BASE + 0x40
+#define TIMER3_CH1_CCR ((TimerCCR)(TIMER3_BASE + 0x34))
+#define TIMER3_CH2_CCR ((TimerCCR)(TIMER3_BASE + 0x38))
+#define TIMER3_CH3_CCR ((TimerCCR)(TIMER3_BASE + 0x3C))
+#define TIMER3_CH4_CCR ((TimerCCR)(TIMER3_BASE + 0x40))
-/* Timer5 and Timer8 are in high-density devices only (such as Maple
- Native). Timer6 and Timer7 in these devices have no output compare
+#define TIMER4_CH1_CCR ((TimerCCR)(TIMER4_BASE + 0x34))
+#define TIMER4_CH2_CCR ((TimerCCR)(TIMER4_BASE + 0x38))
+#define TIMER4_CH3_CCR ((TimerCCR)(TIMER4_BASE + 0x3C))
+#define TIMER4_CH4_CCR ((TimerCCR)(TIMER4_BASE + 0x40))
+
+/* Timers 5 and 8 are in high-density devices only (such as Maple
+ Native). Timers 6 and 7 in these devices have no output compare
pins. */
-#define TIMER5_CH1_CCR TIMER5_BASE + 0x34
-#define TIMER5_CH2_CCR TIMER5_BASE + 0x38
-#define TIMER5_CH3_CCR TIMER5_BASE + 0x3C
-#define TIMER5_CH4_CCR TIMER5_BASE + 0x40
+#define TIMER5_CH1_CCR ((TimerCCR)(TIMER5_BASE + 0x34))
+#define TIMER5_CH2_CCR ((TimerCCR)(TIMER5_BASE + 0x38))
+#define TIMER5_CH3_CCR ((TimerCCR)(TIMER5_BASE + 0x3C))
+#define TIMER5_CH4_CCR ((TimerCCR)(TIMER5_BASE + 0x40))
-#define TIMER8_CH1_CCR TIMER8_BASE + 0x34
-#define TIMER8_CH2_CCR TIMER8_BASE + 0x38
-#define TIMER8_CH3_CCR TIMER8_BASE + 0x3C
-#define TIMER8_CH4_CCR TIMER8_BASE + 0x40
+#define TIMER8_CH1_CCR ((TimerCCR)(TIMER8_BASE + 0x34))
+#define TIMER8_CH2_CCR ((TimerCCR)(TIMER8_BASE + 0x38))
+#define TIMER8_CH3_CCR ((TimerCCR)(TIMER8_BASE + 0x3C))
+#define TIMER8_CH4_CCR ((TimerCCR)(TIMER8_BASE + 0x40))
/**
* Used to configure the behavior of a timer.
@@ -149,6 +151,8 @@ typedef enum TimerMode {
} TimerMode;
typedef struct {
+ /* Fields up to ARR common to general purpose (2,3,4,5), advanced
+ control (1,8) and basic (6, 7) timers: */
volatile uint16 CR1;
uint16 RESERVED0;
volatile uint16 CR2;
@@ -173,8 +177,9 @@ typedef struct {
uint16 RESERVED10;
volatile uint16 ARR;
uint16 RESERVED11;
- volatile uint16 RCR;
- uint16 RESERVED12;
+ /* Basic timers have none of the following: */
+ volatile uint16 RCR; /* Advanced control timers only */
+ uint16 RESERVED12; /* Advanced control timers only */
volatile uint16 CCR1;
uint16 RESERVED13;
volatile uint16 CCR2;
@@ -183,25 +188,32 @@ typedef struct {
uint16 RESERVED15;
volatile uint16 CCR4;
uint16 RESERVED16;
- volatile uint16 BDTR; // Not used in general purpose timers
- uint16 RESERVED17; // Not used in general purpose timers
+ volatile uint16 BDTR; /* Advanced control timers only */
+ uint16 RESERVED17; /* Advanced control timers only */
volatile uint16 DCR;
uint16 RESERVED18;
volatile uint16 DMAR;
uint16 RESERVED19;
} timer_port;
-/* timer device numbers */
-enum {
- TIMER1,
- TIMER2,
- TIMER3,
- TIMER4,
- TIMER5, // High density only
- TIMER6, // High density only; no compare
- TIMER7, // High density only; no compare
- TIMER8, // High density only
-};
+/**
+ * Timer device numbers. See STM32 reference manual, chapters 13-15.
+ */
+/* several locations depend on TIMER1=0, etc.; don't change the
+ enumerator values to start at 1. */
+typedef enum {
+ TIMER1, /*< Advanced control timer TIM1 */
+ TIMER2, /*< General purpose timer TIM2 */
+ TIMER3, /*< General purpose timer TIM3 */
+ TIMER4, /*< General purpose timer TIM4 */
+#if NR_TIMERS >= 8
+ TIMER5, /*< General purpose timer TIM5; high density only */
+ /* TIMER6, /\*< Basic timer TIM6; high density only *\/ */
+ /* TIMER7, /\*< Basic timer TIM7; high density only *\/ */
+ TIMER8, /*< Advanced control timer TIM8; high density only */
+#endif
+ TIMER_INVALID /* FIXME: this is starting to seem like a bad idea */
+} timer_dev_num;
/* timer descriptor */
struct timer_dev {
@@ -218,19 +230,33 @@ extern struct timer_dev timer_dev_table[];
* timer -> {1-4}
* prescale -> {1-65535}
*/
-void timer_init(uint8, uint16);
+void timer_init(timer_dev_num, 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);
-void timer_set_compare_value(uint8 timer_num, uint8 compare_num, uint16 value);
-void timer_attach_interrupt(uint8 timer_num, uint8 compare_num,
+
+uint16 timer_get_count(timer_dev_num);
+void timer_set_count(timer_dev_num,uint16);
+
+void timer_pause(timer_dev_num);
+void timer_resume(timer_dev_num);
+
+uint16 timer_get_prescaler(timer_dev_num timer_num);
+void timer_set_prescaler(timer_dev_num timer_num, uint16 prescale);
+
+uint16 timer_get_reload(timer_dev_num timer_num);
+void timer_set_reload(timer_dev_num timer_num, uint16 max_reload);
+
+/* TODO: timer_get_mode */
+void timer_set_mode(timer_dev_num timer_num, uint8 channel_num, uint8 mode);
+
+uint16 timer_get_compare_value(timer_dev_num timer_num, uint8 channel_num);
+void timer_set_compare_value(timer_dev_num timer_num, uint8 channel_num, uint16 value);
+
+void timer_attach_interrupt(timer_dev_num timer_num, uint8 channel_num,
voidFuncPtr handler);
-void timer_detach_interrupt(uint8 timer_num, uint8 compare_num);
+void timer_detach_interrupt(timer_dev_num timer_num, uint8 channel_num);
+
+/* generate UEV */
+void timer_generate_update(timer_dev_num timer_num);
/* Turn on PWM with duty_cycle on the specified channel in timer.
* This function takes in a pointer to the corresponding CCR
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 00:58:55 +0000