#endif
-#define TIMER_BASE_CLK (APB_CLK_FREQ)
+#define TIMER_BASE_CLK (APB_CLK_FREQ) /*!< Frequency of the clock on the input of the timer groups */
+
/**
* @brief Selects a Timer-Group out of 2 available groups
*/
} timer_autoreload_t;
/**
- * @brief timer configure struct
+ * @brief Data structure with timer's configuration settings
*/
typedef struct {
- bool alarm_en; /*!< Timer alarm enable */
- bool counter_en; /*!< Counter enable */
+ bool alarm_en; /*!< Timer alarm enable */
+ bool counter_en; /*!< Counter enable */
timer_intr_mode_t intr_type; /*!< Interrupt mode */
timer_count_dir_t counter_dir; /*!< Counter direction */
- bool auto_reload; /*!< Timer auto-reload */
- uint16_t divider; /*!< Counter clock divider*/
+ bool auto_reload; /*!< Timer auto-reload */
+ uint32_t divider; /*!< Counter clock divider. The divider's range is from from 2 to 65536. */
} timer_config_t;
*
* @param group_num Timer group number, 0 for TIMERG0 or 1 for TIMERG1
* @param timer_num Timer index, 0 for hw_timer[0] & 1 for hw_timer[1]
- * @param divider Timer clock divider value.
+ * @param divider Timer clock divider value. The divider's range is from from 2 to 65536.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
-esp_err_t timer_set_divider(timer_group_t group_num, timer_idx_t timer_num, uint16_t divider);
+esp_err_t timer_set_divider(timer_group_t group_num, timer_idx_t timer_num, uint32_t divider);
/**
* @brief Set timer alarm value.
*/
esp_err_t timer_set_alarm(timer_group_t group_num, timer_idx_t timer_num, timer_alarm_t alarm_en);
-
/**
- * @brief register Timer interrupt handler, the handler is an ISR.
- * The handler will be attached to the same CPU core that this function is running on.
+ * @brief Register Timer interrupt handler, the handler is an ISR.
+ * The handler will be attached to the same CPU core that this function is running on.
*
* @param group_num Timer group number
* @param timer_num Timer index of timer group
* @param fn Interrupt handler function.
- * @note
- * In case the this is called with the INIRAM flag, code inside the handler function can
- * only call functions in IRAM, so it cannot call other timer APIs.
- * Use direct register access to access timers from inside the ISR in this case.
- *
* @param arg Parameter for handler function
- * @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
- * ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
- * @param handle Pointer to return handle. If non-NULL, a handle for the interrupt will
- * be returned here.
- * @return
- * - ESP_OK Success
- * - ESP_ERR_INVALID_ARG Function pointer error.
+ * @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
+ * ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
+ * @param handle Pointer to return handle. If non-NULL, a handle for the interrupt will
+ * be returned here.
+ *
+ * @note If the intr_alloc_flags value ESP_INTR_FLAG_IRAM is set,
+ * the handler function must be declared with IRAM_ATTR attribute
+ * and can only call functions in IRAM or ROM. It cannot call other timer APIs.
+ * Use direct register access to configure timers from inside the ISR in this case.
*
* @return
* - ESP_OK Success
#define TIMER_AUTORELOAD_ERROR "HW TIMER AUTORELOAD ERROR"
#define TIMER_SCALE_ERROR "HW TIMER SCALE ERROR"
#define TIMER_ALARM_ERROR "HW TIMER ALARM ERROR"
+#define DIVIDER_RANGE_ERROR "HW TIMER divider outside of [2, 65536] range error"
static timg_dev_t *TG[2] = {&TIMERG0, &TIMERG1};
static portMUX_TYPE timer_spinlock[TIMER_GROUP_MAX] = {portMUX_INITIALIZER_UNLOCKED, portMUX_INITIALIZER_UNLOCKED};
return ESP_OK;
}
-esp_err_t timer_set_divider(timer_group_t group_num, timer_idx_t timer_num, uint16_t divider)
+esp_err_t timer_set_divider(timer_group_t group_num, timer_idx_t timer_num, uint32_t divider)
{
TIMER_CHECK(group_num < TIMER_GROUP_MAX, TIMER_GROUP_NUM_ERROR, ESP_ERR_INVALID_ARG);
TIMER_CHECK(timer_num < TIMER_MAX, TIMER_NUM_ERROR, ESP_ERR_INVALID_ARG);
+ TIMER_CHECK(divider > 1 && divider < 65537, DIVIDER_RANGE_ERROR, ESP_ERR_INVALID_ARG);
TIMER_ENTER_CRITICAL(&timer_spinlock[group_num]);
int timer_en = TG[group_num]->hw_timer[timer_num].config.enable;
TG[group_num]->hw_timer[timer_num].config.enable = 0;
- TG[group_num]->hw_timer[timer_num].config.divider = divider;
+ TG[group_num]->hw_timer[timer_num].config.divider = (uint16_t) divider;
TG[group_num]->hw_timer[timer_num].config.enable = timer_en;
TIMER_EXIT_CRITICAL(&timer_spinlock[group_num]);
return ESP_OK;
TIMER_CHECK(group_num < TIMER_GROUP_MAX, TIMER_GROUP_NUM_ERROR, ESP_ERR_INVALID_ARG);
TIMER_CHECK(timer_num < TIMER_MAX, TIMER_NUM_ERROR, ESP_ERR_INVALID_ARG);
TIMER_CHECK(config != NULL, TIMER_PARAM_ADDR_ERROR, ESP_ERR_INVALID_ARG);
+ TIMER_CHECK(config->divider > 1 && config->divider < 65537, DIVIDER_RANGE_ERROR, ESP_ERR_INVALID_ARG);
if(group_num == 0) {
periph_module_enable(PERIPH_TIMG0_MODULE);
}
TIMER_ENTER_CRITICAL(&timer_spinlock[group_num]);
TG[group_num]->hw_timer[timer_num].config.autoreload = config->auto_reload;
- TG[group_num]->hw_timer[timer_num].config.divider = config->divider;
+ TG[group_num]->hw_timer[timer_num].config.divider = (uint16_t) config->divider;
TG[group_num]->hw_timer[timer_num].config.enable = config->counter_en;
TG[group_num]->hw_timer[timer_num].config.increase = config->counter_dir;
TG[group_num]->hw_timer[timer_num].config.alarm_en = config->alarm_en;
config->alarm_en = TG[group_num]->hw_timer[timer_num].config.alarm_en;
config->auto_reload = TG[group_num]->hw_timer[timer_num].config.autoreload;
config->counter_dir = TG[group_num]->hw_timer[timer_num].config.increase;
- config->counter_dir = TG[group_num]->hw_timer[timer_num].config.divider;
+ config->divider = (TG[group_num]->hw_timer[timer_num].config.divider == 0 ?
+ 65536 : TG[group_num]->hw_timer[timer_num].config.divider);
config->counter_en = TG[group_num]->hw_timer[timer_num].config.enable;
if(TG[group_num]->hw_timer[timer_num].config.level_int_en) {
- config->intr_type =TIMER_INTR_LEVEL;
+ config->intr_type = TIMER_INTR_LEVEL;
}
TIMER_EXIT_CRITICAL(&timer_spinlock[group_num]);
return ESP_OK;
TIMER
-========
+=====
-Overview
---------
+Introduction
+------------
-ESP32 chip contains two hardware timer groups, each containing two general-purpose hardware timers.
+The ESP32 chip contains two hardware timer groups. Each group has two general-purpose hardware timers. They are all 64-bit generic timers based on 16-bit prescalers and 64-bit auto-reload-capable up / down counters.
+
+
+Functional Overview
+-------------------
+
+Typical steps to configure an operate the timer are described in the following sections:
+
+* :ref:`timer-api-timer-initialization` - what parameters should be set up to get the timer working and what specific functionality is provided depending on the set up.
+* :ref:`timer-api-timer-control` - how to read the timer's value, pause / start the timer, and change how it operates.
+* :ref:`timer-api-alarms` - setting and using alarms.
+* :ref:`timer-api-interrupts`- how to enable and use interrupts.
+
+
+.. _timer-api-timer-initialization:
+
+Timer Initialization
+^^^^^^^^^^^^^^^^^^^^
+
+The two timer groups on-board of the ESP32 are identified using :cpp:type:`timer_group_t`. Individual timers in a group are identified with :cpp:type:`timer_idx_t`. The two groups, each having two timers, provide the total of four individual timers to our disposal.
+
+Before starting the timer, it should be initialized by calling :cpp:func:`timer_init`. This function should be provided with a structure :cpp:type:`timer_config_t` to define how timer should operate. In particular the following timer's parameters may be set:
+
+ * **Divider**: How quickly the timer's counter is "ticking". This depends on the setting of :cpp:member:`divider`, that will be used as divisor of the incoming 80 MHz APB_CLK clock.
+ * **Mode**: If the the counter is incrementing or decrementing, defined using :cpp:member:`counter_dir` by selecting one of values from :cpp:type:`timer_count_dir_t`.
+ * **Counter Enable**: If the counter is enabled, then it will start incrementing / decrementing immediately after calling :cpp:func:`timer_init`. This action is set using :cpp:member:`counter_en` by selecting one of vales from :cpp:type:`timer_start_t`.
+ * **Alarm Enable**: Determined by the setting of :cpp:member:`alarm_en`.
+ * **Auto Reload**: Whether the counter should :cpp:member:`auto_reload` a specific initial value on the timer's alarm, or continue incrementing or decrementing.
+ * **Interrupt Type**: Whether an interrupt is triggered on timer's alarm. Set the value defined in :cpp:type:`timer_intr_mode_t`.
+
+To get the current values of the timers settings, use function :cpp:func:`timer_get_config`.
+
+
+.. _timer-api-timer-control:
+
+Timer Control
+^^^^^^^^^^^^^
+
+Once the timer is configured and enabled, it is already "ticking". To check it's current value call :cpp:func:`timer_get_counter_value` or :cpp:func:`timer_get_counter_time_sec`. To set the timer to specific starting value call :cpp:func:`timer_set_counter_value`.
+
+The timer may be paused at any time by calling :cpp:func:`timer_pause`. To start it again call :cpp:func:`timer_start`.
+
+To change how the timer operates you can call once more :cpp:func:`timer_init` described in section :ref:`timer-api-timer-initialization`. Another option is to use dedicated functions to change individual settings:
+
+ * **Divider** value - :cpp:func:`timer_set_divider`. **Note:** the timer should be paused when changing the divider to avoid unpredictable results. If the timer is already running, :cpp:func:`timer_set_divider` will first pause the timer, change the divider, and finally start the timer again.
+ * **Mode** (whether the counter incrementing or decrementing) - :cpp:func:`timer_set_counter_mode`
+ * **Auto Reload** counter on alarm - :cpp:func:`timer_set_auto_reload`
+
+
+.. _timer-api-alarms:
+
+Alarms
+^^^^^^
+
+To set an alarm, call function :cpp:func:`timer_set_alarm_value` and then enable it with :cpp:func:`timer_set_alarm`. The alarm may be also enabled during the timer initialization stage, when :cpp:func:`timer_init` is called.
+
+After the alarm is enabled and the timer reaches the alarm value, depending on configuration, the following two actions may happen:
+
+ * An interrupt will be triggered, if previously configured. See section :ref:`timer-api-interrupts` how to configure interrupts.
+ * When :cpp:member:`auto_reload` is enabled, the timer's counter will be reloaded to start counting from specific initial value. The value to start should be set in advance with :cpp:func:`timer_set_counter_value`.
+
+.. note::
+
+ The alarm will be triggered immediately, if an alarm value is set and the timer has already passed this value.
+
+To check what alarm value has been set up, call :cpp:func:`timer_get_alarm_value`.
+
+
+.. _timer-api-interrupts:
+
+Interrupts
+^^^^^^^^^^
+
+Registration of the interrupt handler for a specific timer group and timer is done be calling :cpp:func:`timer_isr_register`.
+
+To enable interrupts for a timer group call :cpp:func:`timer_group_intr_enable`. To do it for a specific timer, call :cpp:func:`timer_enable_intr`. Disabling of interrupts is done with corresponding functions :cpp:func:`timer_group_intr_disable` and :cpp:func:`timer_disable_intr`.
+
+When servicing an interrupt within an ISR, the interrupt need to explicitly cleared. To do so, set the ``TIMERGN.int_clr_timers.tM`` structure defined in :component_file:`soc/esp32/include/soc/timer_group_struct.h`, where N is the timer group number [0, 1] and M is the timer number [0, 1]. For example to clear an interrupt for the timer 1 in the timer group 0, call the following::
+
+ TIMERG0.int_clr_timers.t1 = 1
+
+See the application example below how to use interrupts.
-They are all 64-bit generic timers based on 16-bit prescalers and 64-bit auto-reload-capable up/down counters.
Application Example
-------------------
-64-bit hardware timer example: :example:`peripherals/timer_group`.
+The 64-bit hardware timer example: :example:`peripherals/timer_group`.
+
API Reference
-------------
.. include:: /_build/inc/timer.inc
-
#include "driver/periph_ctrl.h"
#include "driver/timer.h"
-#define TIMER_INTR_SEL TIMER_INTR_LEVEL /*!< Timer level interrupt */
-#define TIMER_GROUP TIMER_GROUP_0 /*!< Test on timer group 0 */
-#define TIMER_DIVIDER 16 /*!< Hardware timer clock divider */
-#define TIMER_SCALE (TIMER_BASE_CLK / TIMER_DIVIDER) /*!< used to calculate counter value */
-#define TIMER_FINE_ADJ (1.4*(TIMER_BASE_CLK / TIMER_DIVIDER)/1000000) /*!< used to compensate alarm value */
-#define TIMER_INTERVAL0_SEC (3.4179) /*!< test interval for timer 0 */
-#define TIMER_INTERVAL1_SEC (5.78) /*!< test interval for timer 1 */
-#define TEST_WITHOUT_RELOAD 0 /*!< example of auto-reload mode */
-#define TEST_WITH_RELOAD 1 /*!< example without auto-reload mode */
+#define TIMER_DIVIDER 16 // Hardware timer clock divider
+#define TIMER_SCALE (TIMER_BASE_CLK / TIMER_DIVIDER) // convert counter value to seconds
+#define TIMER_INTERVAL0_SEC (3.4179) // sample test interval for the first timer
+#define TIMER_INTERVAL1_SEC (5.78) // sample test interval for the second timer
+#define TEST_WITHOUT_RELOAD 0 // testing will be done without auto reload
+#define TEST_WITH_RELOAD 1 // testing will be done with auto reload
+/*
+ * A sample structure to pass events
+ * from the timer interrupt handler to the main program.
+ */
typedef struct {
- int type; /*!< event type */
- int group; /*!< timer group */
- int idx; /*!< timer number */
- uint64_t counter_val; /*!< timer counter value */
+ int type; // the type of timer's event
+ int timer_group;
+ int timer_idx;
+ uint64_t timer_counter_value;
} timer_event_t;
xQueueHandle timer_queue;
/*
- * @brief Print a uint64_t value
+ * A simple helper function to print the raw timer counter value
+ * and the counter value converted to seconds
*/
-static void inline print_u64(uint64_t val)
+static void inline print_timer_counter(uint64_t counter_value)
{
- printf("0x%08x%08x\n", (uint32_t) (val >> 32), (uint32_t) (val));
-}
-
-static void timer_example_evt_task(void *arg)
-{
- while(1) {
- timer_event_t evt;
- xQueueReceive(timer_queue, &evt, portMAX_DELAY);
- if(evt.type == TEST_WITHOUT_RELOAD) {
- printf("\n\n example of count-up-timer \n");
- } else if(evt.type == TEST_WITH_RELOAD) {
- printf("\n\n example of reload-timer \n");
-
- }
- /*Show timer event from interrupt*/
- printf("-------INTR TIME EVT--------\n");
- printf("TG[%d] timer[%d] alarm evt\n", evt.group, evt.idx);
- printf("reg: ");
- print_u64(evt.counter_val);
-
- double time = (double) evt.counter_val / (TIMER_BASE_CLK / TIMERG0.hw_timer[evt.idx].config.divider);
- printf("time: %.8f S\n", time);
- /*Read timer value from task*/
- printf("======TASK TIME======\n");
- uint64_t timer_val;
- timer_get_counter_value(evt.group, evt.idx, &timer_val);
- timer_get_counter_time_sec(evt.group, evt.idx, &time);
- printf("TG[%d] timer[%d] alarm evt\n", evt.group, evt.idx);
- printf("reg: ");
- print_u64(timer_val);
- printf("time: %.8f S\n", time);
- }
+ printf("Counter: 0x%08x%08x\n", (uint32_t) (counter_value >> 32),
+ (uint32_t) (counter_value));
+ printf("Time : %.8f s\n", (double) counter_value / TIMER_SCALE);
}
/*
- * @brief timer group0 ISR handler
+ * Timer group0 ISR handler
+ *
+ * Note:
+ * We don't call the timer API here because they are not declared with IRAM_ATTR.
+ * If we're okay with the timer irq not being serviced while SPI flash cache is disabled,
+ * we can allocate this interrupt without the ESP_INTR_FLAG_IRAM flag and use the normal API.
*/
void IRAM_ATTR timer_group0_isr(void *para)
{
int timer_idx = (int) para;
+
+ /* Retrieve the interrupt status and the counter value
+ from the timer that reported the interrupt */
uint32_t intr_status = TIMERG0.int_st_timers.val;
- timer_event_t evt;
- if((intr_status & BIT(timer_idx)) && timer_idx == TIMER_0) {
- /*Timer0 is an example that doesn't reload counter value*/
- TIMERG0.hw_timer[timer_idx].update = 1;
+ TIMERG0.hw_timer[timer_idx].update = 1;
+ uint64_t timer_counter_value =
+ ((uint64_t) TIMERG0.hw_timer[timer_idx].cnt_high) << 32
+ | TIMERG0.hw_timer[timer_idx].cnt_low;
- /* We don't call a API here because they are not declared with IRAM_ATTR.
- If we're okay with the timer irq not being serviced while SPI flash cache is disabled,
- we can alloc this interrupt without the ESP_INTR_FLAG_IRAM flag and use the normal API. */
- TIMERG0.int_clr_timers.t0 = 1;
- uint64_t timer_val = ((uint64_t) TIMERG0.hw_timer[timer_idx].cnt_high) << 32
- | TIMERG0.hw_timer[timer_idx].cnt_low;
+ /* Prepare basic event data
+ that will be then sent back to the main program task */
+ timer_event_t evt;
+ evt.timer_group = 0;
+ evt.timer_idx = timer_idx;
+ evt.timer_counter_value = timer_counter_value;
- /*Post an event to out example task*/
+ /* Clear the interrupt
+ and update the alarm time for the timer with without reload */
+ if ((intr_status & BIT(timer_idx)) && timer_idx == TIMER_0) {
evt.type = TEST_WITHOUT_RELOAD;
- evt.group = 0;
- evt.idx = timer_idx;
- evt.counter_val = timer_val;
- xQueueSendFromISR(timer_queue, &evt, NULL);
-
- /*For a timer that will not reload, we need to set the next alarm value each time. */
- timer_val +=
- (uint64_t) (TIMER_INTERVAL0_SEC * (TIMER_BASE_CLK / TIMERG0.hw_timer[timer_idx].config.divider));
- /*Fine adjust*/
- timer_val -= TIMER_FINE_ADJ;
- TIMERG0.hw_timer[timer_idx].alarm_high = (uint32_t) (timer_val >> 32);
- TIMERG0.hw_timer[timer_idx].alarm_low = (uint32_t) timer_val;
- /*After set alarm, we set alarm_en bit if we want to enable alarm again.*/
- TIMERG0.hw_timer[timer_idx].config.alarm_en = 1;
-
- } else if((intr_status & BIT(timer_idx)) && timer_idx == TIMER_1) {
- /*Timer1 is an example that will reload counter value*/
- TIMERG0.hw_timer[timer_idx].update = 1;
- /*We don't call a API here because they are not declared with IRAM_ATTR*/
- TIMERG0.int_clr_timers.t1 = 1;
- uint64_t timer_val = ((uint64_t) TIMERG0.hw_timer[timer_idx].cnt_high) << 32
- | TIMERG0.hw_timer[timer_idx].cnt_low;
- /*Post an event to out example task*/
+ TIMERG0.int_clr_timers.t0 = 1;
+ timer_counter_value += (uint64_t) (TIMER_INTERVAL0_SEC * TIMER_SCALE);
+ TIMERG0.hw_timer[timer_idx].alarm_high = (uint32_t) (timer_counter_value >> 32);
+ TIMERG0.hw_timer[timer_idx].alarm_low = (uint32_t) timer_counter_value;
+ } else if ((intr_status & BIT(timer_idx)) && timer_idx == TIMER_1) {
evt.type = TEST_WITH_RELOAD;
- evt.group = 0;
- evt.idx = timer_idx;
- evt.counter_val = timer_val;
- xQueueSendFromISR(timer_queue, &evt, NULL);
- /*For a auto-reload timer, we still need to set alarm_en bit if we want to enable alarm again.*/
- TIMERG0.hw_timer[timer_idx].config.alarm_en = 1;
+ TIMERG0.int_clr_timers.t1 = 1;
+ } else {
+ evt.type = -1; // not supported even type
}
+
+ /* After the alarm has been triggered
+ we need enable it again, so it is triggered the next time */
+ TIMERG0.hw_timer[timer_idx].config.alarm_en = TIMER_ALARM_EN;
+
+ /* Now just send the event data back to the main program task */
+ xQueueSendFromISR(timer_queue, &evt, NULL);
}
/*
- * @brief timer group0 hardware timer0 init
+ * Initialize selected timer of the timer group 0
+ *
+ * timer_idx - the timer number to initialize
+ * auto_reload - should the timer auto reload on alarm?
+ * timer_interval_sec - the interval of alarm to set
*/
-static void example_tg0_timer0_init()
+static void example_tg0_timer_init(int timer_idx,
+ bool auto_reload, double timer_interval_sec)
{
- int timer_group = TIMER_GROUP_0;
- int timer_idx = TIMER_0;
+ /* Select and initialize basic parameters of the timer */
timer_config_t config;
- config.alarm_en = 1;
- config.auto_reload = 0;
- config.counter_dir = TIMER_COUNT_UP;
config.divider = TIMER_DIVIDER;
- config.intr_type = TIMER_INTR_SEL;
+ config.counter_dir = TIMER_COUNT_UP;
config.counter_en = TIMER_PAUSE;
- /*Configure timer*/
- timer_init(timer_group, timer_idx, &config);
- /*Stop timer counter*/
- timer_pause(timer_group, timer_idx);
- /*Load counter value */
- timer_set_counter_value(timer_group, timer_idx, 0x00000000ULL);
- /*Set alarm value*/
- timer_set_alarm_value(timer_group, timer_idx, TIMER_INTERVAL0_SEC * TIMER_SCALE - TIMER_FINE_ADJ);
- /*Enable timer interrupt*/
- timer_enable_intr(timer_group, timer_idx);
- /*Set ISR handler*/
- timer_isr_register(timer_group, timer_idx, timer_group0_isr, (void*) timer_idx, ESP_INTR_FLAG_IRAM, NULL);
- /*Start timer counter*/
- timer_start(timer_group, timer_idx);
+ config.alarm_en = TIMER_ALARM_EN;
+ config.intr_type = TIMER_INTR_LEVEL;
+ config.auto_reload = auto_reload;
+ timer_init(TIMER_GROUP_0, timer_idx, &config);
+
+ /* Timer's counter will initially start from value below.
+ Also, if auto_reload is set, this value will be automatically reload on alarm */
+ timer_set_counter_value(TIMER_GROUP_0, timer_idx, 0x00000000ULL);
+
+ /* Configure the alarm value and the interrupt on alarm. */
+ timer_set_alarm_value(TIMER_GROUP_0, timer_idx, timer_interval_sec * TIMER_SCALE);
+ timer_enable_intr(TIMER_GROUP_0, timer_idx);
+ timer_isr_register(TIMER_GROUP_0, timer_idx, timer_group0_isr,
+ (void *) timer_idx, ESP_INTR_FLAG_IRAM, NULL);
+
+ timer_start(TIMER_GROUP_0, timer_idx);
}
/*
- * @brief timer group0 hardware timer1 init
+ * The main task of this example program
*/
-static void example_tg0_timer1_init()
+static void timer_example_evt_task(void *arg)
{
- int timer_group = TIMER_GROUP_0;
- int timer_idx = TIMER_1;
- timer_config_t config;
- config.alarm_en = 1;
- config.auto_reload = 1;
- config.counter_dir = TIMER_COUNT_UP;
- config.divider = TIMER_DIVIDER;
- config.intr_type = TIMER_INTR_SEL;
- config.counter_en = TIMER_PAUSE;
- /*Configure timer*/
- timer_init(timer_group, timer_idx, &config);
- /*Stop timer counter*/
- timer_pause(timer_group, timer_idx);
- /*Load counter value */
- timer_set_counter_value(timer_group, timer_idx, 0x00000000ULL);
- /*Set alarm value*/
- timer_set_alarm_value(timer_group, timer_idx, TIMER_INTERVAL1_SEC * TIMER_SCALE);
- /*Enable timer interrupt*/
- timer_enable_intr(timer_group, timer_idx);
- /*Set ISR handler*/
- timer_isr_register(timer_group, timer_idx, timer_group0_isr, (void*) timer_idx, ESP_INTR_FLAG_IRAM, NULL);
- /*Start timer counter*/
- timer_start(timer_group, timer_idx);
+ while (1) {
+ timer_event_t evt;
+ xQueueReceive(timer_queue, &evt, portMAX_DELAY);
+
+ /* Print information that the timer reported an event */
+ if (evt.type == TEST_WITHOUT_RELOAD) {
+ printf("\n Example timer without reload\n");
+ } else if (evt.type == TEST_WITH_RELOAD) {
+ printf("\n Example timer with auto reload\n");
+ } else {
+ printf("\n UNKNOWN EVENT TYPE\n");
+ }
+ printf("Group[%d], timer[%d] alarm event\n", evt.timer_group, evt.timer_idx);
+
+ /* Print the timer values passed by event */
+ printf("------- EVENT TIME --------\n");
+ print_timer_counter(evt.timer_counter_value);
+
+ /* Print the timer values as visible by this task */
+ printf("-------- TASK TIME --------\n");
+ uint64_t task_counter_value;
+ timer_get_counter_value(evt.timer_group, evt.timer_idx, &task_counter_value);
+ print_timer_counter(task_counter_value);
+ }
}
-/**
- * @brief In this test, we will test hardware timer0 and timer1 of timer group0.
+/*
+ * In this example, we will test hardware timer0 and timer1 of timer group0.
*/
void app_main()
{
timer_queue = xQueueCreate(10, sizeof(timer_event_t));
- example_tg0_timer0_init();
- example_tg0_timer1_init();
+ example_tg0_timer_init(TIMER_0, TEST_WITHOUT_RELOAD, TIMER_INTERVAL0_SEC);
+ example_tg0_timer_init(TIMER_1, TEST_WITH_RELOAD, TIMER_INTERVAL1_SEC);
xTaskCreate(timer_example_evt_task, "timer_evt_task", 2048, NULL, 5, NULL);
}
projects / esp-idf / commitdiff