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Add some comments in pcnt.h.

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This commit is contained in:
kooho 2018-05-25 15:37:20 +08:00
parent baa4613fc1
commit 01516abe5a
3 changed files with 18 additions and 3 deletions
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10
components/driver/include/driver/pcnt.h
View file

@ -98,6 +98,8 @@ typedef intr_handle_t pcnt_isr_handle_t;
/**
* @brief Configure Pulse Counter unit
* @note
* This function will disable three events: PCNT_EVT_L_LIM, PCNT_EVT_H_LIM, PCNT_EVT_ZERO.
*
* @param pcnt_config Pointer of Pulse Counter unit configure parameter
*
@ -233,16 +235,19 @@ esp_err_t pcnt_get_event_value(pcnt_unit_t unit, pcnt_evt_type_t evt_type, int16
/**
* @brief Register PCNT interrupt handler, the handler is an ISR.
* The handler will be attached to the same CPU core that this function is running on.
* Please do not use pcnt_isr_service_install if this function was called.
*
* @param fn Interrupt handler function.
* @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.
* be returned here. Calling esp_intr_free to unregister this ISR service if needed,
* but only if the handle is not NULL.
*
* @return
* - ESP_OK Success
* - ESP_ERR_NOT_FOUND Can not find the interrupt that matches the flags.
* - ESP_ERR_INVALID_ARG Function pointer error.
*/
esp_err_t pcnt_isr_register(void (*fn)(void*), void * arg, int intr_alloc_flags, pcnt_isr_handle_t *handle);
@ -358,7 +363,8 @@ esp_err_t pcnt_isr_handler_add(pcnt_unit_t unit, void(*isr_handler)(void *), voi
/**
* @brief Install PCNT ISR service.
* @note We can manage different interrupt service for each unit.
* Please do not use pcnt_isr_register if this function was called.
* This function will use the default ISR handle service, Calling pcnt_isr_service_uninstall to
* uninstall the default service if needed. Please do not use pcnt_isr_register if this function was called.
*
* @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.

3
components/driver/pcnt.c
View file

@ -24,6 +24,7 @@
#define PCNT_COUNT_MODE_ERR_STR "PCNT COUNTER MODE ERROR"
#define PCNT_CTRL_MODE_ERR_STR "PCNT CTRL MODE ERROR"
#define PCNT_EVT_TYPE_ERR_STR "PCNT value type error"
#define PCNT_LIMT_VAL_ERR_STR "PCNT limit value error"
#define PCNT_ENTER_CRITICAL(mux) portENTER_CRITICAL(mux)
#define PCNT_EXIT_CRITICAL(mux) portEXIT_CRITICAL(mux)
@ -221,6 +222,8 @@ esp_err_t pcnt_set_event_value(pcnt_unit_t unit, pcnt_evt_type_t evt_type, int16
{
PCNT_CHECK(unit < PCNT_UNIT_MAX, PCNT_UNIT_ERR_STR, ESP_ERR_INVALID_ARG);
PCNT_CHECK(evt_type < PCNT_EVT_MAX, PCNT_EVT_TYPE_ERR_STR, ESP_ERR_INVALID_ARG);
PCNT_CHECK(!(evt_type == PCNT_EVT_L_LIM && value > 0), PCNT_LIMT_VAL_ERR_STR, ESP_ERR_INVALID_ARG);
PCNT_CHECK(!(evt_type == PCNT_EVT_H_LIM && value < 0), PCNT_LIMT_VAL_ERR_STR, ESP_ERR_INVALID_ARG);
if(evt_type == PCNT_EVT_L_LIM) {
PCNT.conf_unit[unit].conf2.cnt_l_lim = value;
} else if(evt_type == PCNT_EVT_H_LIM) {

8
examples/peripherals/pcnt/main/pcnt_example_main.c
View file

@ -54,6 +54,7 @@
#define LEDC_OUTPUT_IO 18 // Output GPIO of a sample 1 Hz pulse generator
xQueueHandle pcnt_evt_queue; // A queue to handle pulse counter events
pcnt_isr_handle_t user_isr_handle = NULL; //user's ISR service handle
/* A sample structure to pass events from the PCNT
* interrupt handler to the main program.
@ -159,7 +160,7 @@ static void pcnt_example_init(void)
pcnt_counter_clear(PCNT_TEST_UNIT);
/* Register ISR handler and enable interrupts for PCNT unit */
pcnt_isr_register(pcnt_example_intr_handler, NULL, 0, NULL);
pcnt_isr_register(pcnt_example_intr_handler, NULL, 0, &user_isr_handle);
pcnt_intr_enable(PCNT_TEST_UNIT);
/* Everything is set up, now go to counting */
@ -206,4 +207,9 @@ void app_main()
printf("Current counter value :%d\n", count);
}
}
if(user_isr_handle) {
//Free the ISR service handle.
esp_intr_free(user_isr_handle);
user_isr_handle = NULL;
}
}