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SourceVuESP-IDF Framework and ExamplesESP-IDFpcnt_new_unit()

pcnt_new_unit() function

Create a new PCNT unit, and return the handle

Syntax

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Summary

Declaration

Definition

from pulse_cnt.h:113

esp_err_t pcnt_new_unit(const pcnt_unit_config_t *config, pcnt_unit_handle_t *ret_unit);

Implemented in pulse_cnt.c:198

Arguments

Argument

Description

config

PCNT unit configuration

ret_unit

Returned PCNT unit handle

Return value

- ESP_OK: Create PCNT unit successfully - ESP_ERR_INVALID_ARG: Create PCNT unit failed because of invalid argument (e.g. high/low limit value out of the range) - ESP_ERR_NO_MEM: Create PCNT unit failed because out of memory - ESP_ERR_NOT_FOUND: Create PCNT unit failed because all PCNT units are used up and no more free one - ESP_FAIL: Create PCNT unit failed because of other error

Notes

The newly created PCNT unit is put in the init state.

Examples

pcnt_new_unit() is referenced by 2 libraries and example projects:

mcpwm_bdc_speed_control sample

rotary_encoder sample

References

from 0/2 examples

Code

Location

Referrer

esp_err_t pcnt_new_unit(const pcnt_unit_config_t *config, pcnt_unit_handle_t *ret_unit)

pulse_cnt.c:198

extern __attribute__((weak)) esp_err_t pcnt_new_unit(const void *config, void **ret_unit);

pcnt_legacy.c:567

esp_err_t pcnt_new_unit(const pcnt_unit_config_t *config, pcnt_unit_handle_t *ret_unit);

pulse_cnt.h:113

if ((void *)pcnt_new_unit != NULL) {

pcnt_legacy.c:568

check_pcnt_driver_conflict()

Call Tree

from 0/2 examples

pcnt_new_unit() calls 18 functions:

pcnt_new_unit()

vPortEnterCritical()

esp_intr_alloc_intrstatus()

esp_log_timestamp()

esp_log_write()

heap_caps_calloc()

vPortExitCritical()

pcnt_ll_clear_intr_status()

pcnt_ll_disable_all_events()

pcnt_ll_stop_count()

pcnt_ll_clear_count()

pcnt_ll_enable_intr()

pcnt_ll_set_high_limit_value()

pcnt_ll_set_low_limit_value()

pcnt_ll_enable_glitch_filter()

pcnt_ll_get_intr_status_reg()

pcnt_register_to_group()

esp_pm_lock_create()

Data Use

from 0/2 examples

pcnt_new_unit() reads 30 variables and writes 10 variables:

pcnt_new_unit()

check_pcnt_driver_conflict()

pcnt_group_t::intr_priority

pcnt_watch_point_t::event_id

pcnt_unit_t::spinlock

pcnt_unit_t::low_limit

pcnt_unit_t::high_limit

pcnt_unit_t::clear_signal_gpio_num

pcnt_unit_t::accum_value

pcnt_unit_t::fsm

pcnt_unit_t::::accum_count

Class Tree

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Override Tree

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Implementations

from 0/2 examples

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Instances

from 0/2 examples

Lifecycle

from 0/2 examples

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