Simple periodic timer

clock_timer.c

@@ -0,0 +1,57 @@
+#include "clock_timer.h"
+#include <stdlib.h>
+
+#include <furi_hal_interrupt.h>
+#include <furi_hal_bus.h>
+#include <stm32wbxx_ll_tim.h>
+
+#define FURI_HAL_CLOCK_TIMER TIM2
+#define FURI_HAL_CLOCK_TIMER_BUS FuriHalBusTIM2
+#define FURI_HAL_CLOCK_TIMER_IRQ FuriHalInterruptIdTIM2
+
+typedef struct {
+    ClockTimerCallback callback;
+    void* context;
+} ClockTimer;
+
+static ClockTimer clock_timer = {
+    .callback = NULL,
+    .context = NULL,
+};
+
+static void clock_timer_isr(void* context) {
+    if(clock_timer.callback) {
+        clock_timer.callback(context);
+    }
+
+    LL_TIM_ClearFlag_UPDATE(FURI_HAL_CLOCK_TIMER);
+}
+
+void clock_timer_init(ClockTimerCallback callback, void* context, float period) {
+    clock_timer.callback = callback;
+    clock_timer.context = context;
+
+    furi_hal_bus_enable(FURI_HAL_CLOCK_TIMER_BUS);
+
+    // init timer to produce interrupts
+    LL_TIM_InitTypeDef TIM_InitStruct = {0};
+    TIM_InitStruct.Autoreload = (SystemCoreClock / period) - 1;
+    LL_TIM_Init(FURI_HAL_CLOCK_TIMER, &TIM_InitStruct);
+
+    furi_hal_interrupt_set_isr(FURI_HAL_CLOCK_TIMER_IRQ, clock_timer_isr, clock_timer.context);
+}
+
+void clock_timer_start(void) {
+    LL_TIM_EnableIT_UPDATE(FURI_HAL_CLOCK_TIMER);
+    LL_TIM_EnableCounter(FURI_HAL_CLOCK_TIMER);
+}
+
+void clock_timer_stop(void) {
+    LL_TIM_DisableIT_UPDATE(FURI_HAL_CLOCK_TIMER);
+    LL_TIM_DisableCounter(FURI_HAL_CLOCK_TIMER);
+}
+
+void clock_timer_deinit(void) {
+    furi_hal_bus_disable(FURI_HAL_CLOCK_TIMER_BUS);
+    furi_hal_interrupt_set_isr(FURI_HAL_CLOCK_TIMER_IRQ, NULL, NULL);
+}

clock_timer.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void (*ClockTimerCallback)(void* context);
+
+void clock_timer_init(ClockTimerCallback callback, void* context, float period);
+
+void clock_timer_start(void);
+
+void clock_timer_stop(void);
+
+void clock_timer_deinit(void);
+
+#ifdef __cplusplus
+}
+#endif