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pcnt_unit_start() function
Start the PCNT unit, the counter will start to count according to the edge and/or level input signals
Syntax
Implemented in ![]()
pulse_cnt.c:445
Return value
- ESP_OK: Start PCNT unit successfully - ESP_ERR_INVALID_ARG: Start PCNT unit failed because of invalid argument - ESP_ERR_INVALID_STATE: Start PCNT unit failed because the unit is not enabled yet - ESP_FAIL: Start PCNT unit failed because of other error
Notes
This function should be called when the unit is in the enable state (i.e. after calling `pcnt_unit_enable()`) This function is allowed to run within ISR context This function will be placed into IRAM if `CONFIG_PCNT_CTRL_FUNC_IN_IRAM` is on, so that it's allowed to be executed when Cache is disabled
Related Functions
Found 16 other functions taking a ![]()
pcnt_unit_t
argument:
Function
Description
Create PCNT channel for specific unit, each PCNT has several channels associated with it
Add a watch point for PCNT unit, PCNT will generate an event when the counter value reaches the watch point value
Clear PCNT pulse count value to zero
Get PCNT count value
Set glitch filter for PCNT unit
Enable the PCNT unit
Set event callbacks for PCNT unit
Remove a watch point for PCNT unit
Disable the PCNT unit
Stop PCNT from counting
Delete the PCNT unit handle
Add a step notify for PCNT unit, PCNT will generate an event when the incremental(can be positive or negative) of counter value reaches the step interval
Remove a step notify for PCNT unit
Examples
Code
Location
Call Tree
from 0/2 examplespcnt_unit_start() calls 6 functions:
Data Use
from 0/2 examplespcnt_unit_start() reads 8 variables: