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sdm_channel_set_pulse_density() function
Set the pulse density of the PDM output signal.
Syntax
Return value
- ESP_OK: Set pulse density successfully - ESP_ERR_INVALID_ARG: Set pulse density failed because of invalid argument - ESP_FAIL: Set pulse density failed because of other error
Notes
The raw output signal requires a low-pass filter to restore it into analog voltage, the restored analog output voltage could be Vout = VDD_IO / 256 * density + VDD_IO / 2 This function is allowed to run within ISR context This function will be placed into IRAM if `CONFIG_SDM_CTRL_FUNC_IN_IRAM` is on, so that it's allowed to be executed when Cache is disabled
Related Functions
Found 8 other functions taking a ![]()
sdm_channel_t
argument:
Function
Description
Create a new Sigma Delta channel
Enable the Sigma Delta channel
Delete the Sigma Delta channel
The alias function of `sdm_channel_set_pulse_density`, it decides the pulse density of the output signal
Disable the Sigma Delta channel
Examples
Code
Location
Call Tree
from 0/2 examplessdm_channel_set_pulse_density() calls 6 functions:
Data Use
from 0/2 examplessdm_channel_set_pulse_density() reads 6 variables: