Peripherals
Peripheral Clock Gating
As usual, peripheral clock gating is still handled by driver itself, users don’t need to take care of the peripheral module clock gating.
However, for advanced users who implement their own drivers based on hal
and soc
components, the previous clock gating include path has been changed from driver/periph_ctrl.h
to esp_private/periph_ctrl.h
.
RTC Subsystem Control
RTC control APIs have been moved from driver/rtc_cntl.h
to esp_private/rtc_ctrl.h
.
ADC
ADC Oneshot & Continuous Mode drivers
The ADC oneshot mode driver has been redesigned.
The new driver is in
esp_adc
component and the include path isesp_adc/adc_oneshot.h
.The legacy driver is still available in the previous include path
driver/adc.h
.
The ADC continuous mode driver has been moved from driver
component to esp_adc
component.
The include path has been changed from
driver/adc.h
toesp_adc/adc_continuous.h
.
Attempting to use the legacy include path driver/adc.h
of either driver will trigger the build warning below by default. However, the warning can be suppressed by enabling the CONFIG_ADC_SUPPRESS_DEPRECATE_WARN Kconfig option.
legacy adc driver is deprecated, please migrate to use esp_adc/adc_oneshot.h and esp_adc/adc_continuous.h for oneshot mode and continuous mode drivers respectively
ADC Calibration Driver
The ADC calibration driver has been redesigned.
The new driver is in
esp_adc
component and the include path isesp_adc/adc_cali.h
andesp_adc/adc_cali_scheme.h
.
Legacy driver is still available by including esp_adc_cal.h
. However, if users still would like to use the include path of the legacy driver, users should add esp_adc
component to the list of component requirements in CMakeLists.txt.
Attempting to use the legacy include path esp_adc_cal.h
will trigger the build warning below by default. However, the warning can be suppressed by enabling the CONFIG_ADC_CALI_SUPPRESS_DEPRECATE_WARN Kconfig option.
legacy adc calibration driver is deprecated, please migrate to use esp_adc/adc_cali.h and esp_adc/adc_cali_scheme.h
API Changes
The ADC power management APIs
adc_power_acquire
andadc_power_release
have made private and moved toesp_private/adc_share_hw_ctrl.h
.The two APIs were previously made public due to a HW errata workaround.
Now, ADC power management is completely handled internally by drivers.
Users who still require this API can include
esp_private/adc_share_hw_ctrl.h
to continue using these functions.
driver/adc2_wifi_private.h
has been moved toesp_private/adc_share_hw_ctrl.h
.Enums
ADC_UNIT_BOTH
,ADC_UNIT_ALTER
, andADC_UNIT_MAX
inadc_unit_t
have been removed.The following enumerations have been removed as some of their enumeration values are not supported on all chips. This would lead to the driver triggering a runtime error if an unsupported value is used.
Enum
ADC_CHANNEL_MAX
Enum
ADC_ATTEN_MAX
Enum
ADC_CONV_UNIT_MAX
API
hall_sensor_read
on ESP32 has been removed. Hall sensor is no longer supported on ESP32.API
adc_set_i2s_data_source
andadc_i2s_mode_init
have been deprecated. Related enumadc_i2s_source_t
has been deprecated. Please migrate to useesp_adc/adc_continuous.h
.API
adc_digi_filter_reset
,adc_digi_filter_set_config
,adc_digi_filter_get_config
andadc_digi_filter_enable
have been removed. These APIs behaviours are not guaranteed. Enumadc_digi_filter_idx_t
,adc_digi_filter_mode_t
and structureadc_digi_iir_filter_t
have been removed as well.API
esp_adc_cal_characterize
has been deprecated, please migrate toadc_cali_create_scheme_curve_fitting
oradc_cali_create_scheme_line_fitting
instead.API
esp_adc_cal_raw_to_voltage
has been deprecated, please migrate toadc_cali_raw_to_voltage
instead.API
esp_adc_cal_get_voltage
has been deprecated, please migrate toadc_oneshot_get_calibrated_result
instead.
GPIO
The previous Kconfig option RTCIO_SUPPORT_RTC_GPIO_DESC has been removed, thus the
rtc_gpio_desc
array is unavailable. Please usertc_io_desc
array instead.The user callback of a GPIO interrupt should no longer read the GPIO interrupt status register to get the GPIO’s pin number of triggering the interrupt. You should use the callback argument to determine the GPIO’s pin number instead.
Previously, when a GPIO interrupt occurs, the GPIO’s interrupt status register is cleared after calling the user callbacks. Thus, it was possible for users to read the GPIO’s interrupt status register inside the callback to determine which GPIO was used to trigger the interrupt.
However, clearing the interrupt status register after calling the user callbacks can potentially cause edge-triggered interrupts to be lost. For example, if an edge-triggered interrupt (re)is triggered while the user callbacks are being called, that interrupt will be cleared without its registered user callback being handled.
Now, the GPIO’s interrupt status register is cleared before invoking the user callbacks. Thus, users can no longer read the GPIO interrupt status register to determine which pin has triggered the interrupt. Instead, users should use the callback argument to pass the pin number.
Sigma-Delta Modulator
The Sigma-Delta Modulator driver has been redesigned into SDM.
The new driver implements a factory pattern, where the SDM channels are managed in a pool internally, thus users don’t have to fix a SDM channel to a GPIO manually.
All SDM channels can be allocated dynamically.
Although it’s recommended to use the new driver APIs, the legacy driver is still available in the previous include path driver/sigmadelta.h
. However, by default, including driver/sigmadelta.h
will trigger the build warning below. The warning can be suppressed by Kconfig option CONFIG_SDM_SUPPRESS_DEPRECATE_WARN.
The legacy sigma-delta driver is deprecated, please use driver/sdm.h
The major breaking changes in concept and usage are listed as follows:
Breaking Changes in Concepts
SDM channel representation has changed from
sigmadelta_channel_t
tosdm_channel_handle_t
, which is an opaque pointer.SDM channel configurations are stored in
sdm_config_t
now, instead the previoussigmadelta_config_t
.In the legacy driver, users don’t have to set the clock source for SDM channel. But in the new driver, users need to set a proper one in the
sdm_config_t::clk_src
. The available clock sources are listed in thesoc_periph_sdm_clk_src_t
.In the legacy driver, users need to set a
prescale
for the channel, which reflects the frequency in which the modulator outputs a pulse. In the new driver, users should usesdm_config_t::sample_rate_hz
.
Breaking Changes in Usage
Channel configuration was done by channel allocation, in
sdm_new_channel()
. In the new driver, only theduty
can be changed at runtime, bysdm_channel_set_duty()
. Other parameters likegpio number
andprescale
are only allowed to set during channel allocation.Before further channel operations, users should enable the channel in advance, by calling
sdm_channel_enable()
. This function will help to manage some system level services, like Power Management.
Timer Group Driver
Timer Group driver has been redesigned into GPTimer, which aims to unify and simplify the usage of general purpose timer.
Although it’s recommended to use the the new driver APIs, the legacy driver is still available in the previous include path driver/timer.h
. However, by default, including driver/timer.h
will trigger the build warning below. The warning can be suppressed by the Kconfig option CONFIG_GPTIMER_SUPPRESS_DEPRECATE_WARN.
legacy timer group driver is deprecated, please migrate to driver/gptimer.h
The major breaking changes in concept and usage are listed as follows:
Breaking Changes in Concepts
timer_group_t
andtimer_idx_t
which used to identify the hardware timer are removed from user’s code. In the new driver, a timer is represented bygptimer_handle_t
.Definition of timer clock source is moved to
gptimer_clock_source_t
, the previoustimer_src_clk_t
is not used.Definition of timer count direction is moved to
gptimer_count_direction_t
, the previoustimer_count_dir_t
is not used.Only level interrupt is supported,
timer_intr_t
andtimer_intr_mode_t
are not used.Auto-reload is enabled by set the
gptimer_alarm_config_t::auto_reload_on_alarm
flag.timer_autoreload_t
is not used.
Breaking Changes in Usage
Timer initialization is done by creating a timer instance from
gptimer_new_timer()
. Basic configurations like clock source, resolution and direction should be set ingptimer_config_t
. Note that, specific configurations of alarm events are not needed during the installation stage of the driver.Alarm event is configured by
gptimer_set_alarm_action()
, with parameters set in thegptimer_alarm_config_t
.Setting and getting count value are done by
gptimer_get_raw_count()
andgptimer_set_raw_count()
. The driver doesn’t help convert the raw value into UTC time-stamp. Instead, the conversion should be done from user’s side as the timer resolution is also known to the user.The driver will install the interrupt service as well if
gptimer_event_callbacks_t::on_alarm
is set to a valid callback function. In the callback, users do not have to deal with the low level registers (like “clear interrupt status”, “re-enable alarm event” and so on). So functions liketimer_group_get_intr_status_in_isr
andtimer_group_get_auto_reload_in_isr
are not used anymore.To update the alarm configurations when alarm event happens, one can call
gptimer_set_alarm_action()
in the interrupt callback, then the alarm will be re-enabled again.Alarm will always be re-enabled by the driver if
gptimer_alarm_config_t::auto_reload_on_alarm
is set to true.
UART
Removed/Deprecated items |
Replacement |
Remarks |
---|---|---|
|
None |
UART interrupt handling is implemented by driver itself. |
|
None |
UART interrupt handling is implemented by driver itself. |
|
Select the clock source. |
|
|
Enable pattern detection interrupt. |
I2C
Removed/Deprecated items |
Replacement |
Remarks |
---|---|---|
|
None |
I2C interrupt handling is implemented by driver itself. |
|
None |
I2C interrupt handling is implemented by driver itself. |
|
None |
It’s not used anywhere in esp-idf. |
SPI
Removed/Deprecated items |
Replacement |
Remarks |
---|---|---|
|
Get SPI real working frequency. |
The internal header file
spi_common_internal.h
has been moved toesp_private/spi_common_internal.h
.
LEDC
Removed/Deprecated items |
Replacement |
Remarks |
---|---|---|
|
Set resolution of the duty cycle. |
Pulse Counter Driver
Pulse counter driver has been redesigned (see PCNT), which aims to unify and simplify the usage of PCNT peripheral.
Although it’s recommended to use the new driver APIs, the legacy driver is still available in the previous include path driver/pcnt.h
. However, including driver/pcnt.h
will trigger the build warning below by default. The warning can be suppressed by the Kconfig option CONFIG_PCNT_SUPPRESS_DEPRECATE_WARN.
legacy pcnt driver is deprecated, please migrate to use driver/pulse_cnt.h
The major breaking changes in concept and usage are listed as follows:
Breaking Changes in Concepts
pcnt_port_t
,pcnt_unit_t
andpcnt_channel_t
which used to identify the hardware unit and channel are removed from user’s code. In the new driver, PCNT unit is represented bypcnt_unit_handle_t
, likewise, PCNT channel is represented bypcnt_channel_handle_t
. Both of them are opaque pointers.pcnt_evt_type_t
is not used any more, they have been replaced by a universal Watch Point Event. In the event callbackpcnt_watch_cb_t
, it’s still possible to distinguish different watch points frompcnt_watch_event_data_t
.pcnt_count_mode_t
is replaced bypcnt_channel_edge_action_t
, andpcnt_ctrl_mode_t
is replaced bypcnt_channel_level_action_t
.
Breaking Changes in Usage
Previously, the PCNT unit configuration and channel configuration were combined into a single function:
pcnt_unit_config
. They are now split into the two factory APIs:pcnt_new_unit()
andpcnt_new_channel()
respectively.Only the count range is necessary for initializing a PCNT unit. GPIO number assignment has been moved to
pcnt_new_channel()
.High/Low control mode and positive/negative edge count mode are set by stand-alone functions:
pcnt_channel_set_edge_action()
andpcnt_channel_set_level_action()
.
pcnt_get_counter_value
is replaced bypcnt_unit_get_count()
.pcnt_counter_pause
is replaced bypcnt_unit_stop()
.pcnt_counter_resume
is replaced bypcnt_unit_start()
.pcnt_counter_clear
is replaced bypcnt_unit_clear_count()
.pcnt_intr_enable
andpcnt_intr_disable
are removed. In the new driver, the interrupt is enabled by registering event callbackspcnt_unit_register_event_callbacks()
.pcnt_event_enable
andpcnt_event_disable
are removed. In the new driver, the PCNT events are enabled/disabled by adding/removing watch pointspcnt_unit_add_watch_point()
,pcnt_unit_remove_watch_point()
.pcnt_set_event_value
is removed. In the new driver, event value is also set when adding watch point bypcnt_unit_add_watch_point()
.pcnt_get_event_value
andpcnt_get_event_status
are removed. In the new driver, these information are provided by event callbackpcnt_watch_cb_t
in thepcnt_watch_event_data_t
.pcnt_isr_register
andpcnt_isr_unregister
are removed. Register of the ISR handler from user’s code is no longer permitted. Users should register event callbacks instead by callingpcnt_unit_register_event_callbacks()
.pcnt_set_pin
is removed and the new driver no longer allows the switching of the GPIO at runtime. If users want to change to other GPIOs, please delete the existing PCNT channel bypcnt_del_channel()
and reinstall with the new GPIO number bypcnt_new_channel()
.pcnt_filter_enable
,pcnt_filter_disable
andpcnt_set_filter_value
are replaced bypcnt_unit_set_glitch_filter()
. Meanwhile,pcnt_get_filter_value
has been removed.pcnt_set_mode
is replaced bypcnt_channel_set_edge_action()
andpcnt_channel_set_level_action()
.pcnt_isr_service_install
,pcnt_isr_service_uninstall
,pcnt_isr_handler_add
andpcnt_isr_handler_remove
are replaced bypcnt_unit_register_event_callbacks()
. The default ISR handler is lazy installed in the new driver.
Temperature Sensor Driver
The temperature sensor driver has been redesigned and it is recommended to use the new driver. However, the old driver is still available but cannot be used with the new driver simultaneously.
The new driver can be included via driver/temperature_sensor.h
. The old driver is still available in the previous include path driver/temp_sensor.h
. However, including driver/temp_sensor.h
will trigger the build warning below by default. The warning can be suppressed by enabling the menuconfig option CONFIG_TEMP_SENSOR_SUPPRESS_DEPRECATE_WARN.
legacy temperature sensor driver is deprecated, please migrate to driver/temperature_sensor.h
Configuration contents has been changed. In the old version, users need to configure clk_div
and dac_offset
. While in the new version, users only need to choose tsens_range
.
The process of using temperature sensor has been changed. In the old version, users can use config->start->read_celsius
to get value. In the new version, users should install the temperature sensor driver firstly, by temperature_sensor_install
and uninstall it when finished. For more information, please refer to Temperature Sensor .
RMT Driver
RMT driver has been redesigned (see RMT transceiver), which aims to unify and extend the usage of RMT peripheral.
Although it’s recommended to use the new driver APIs, the legacy driver is still available in the previous include path driver/rmt.h
. However, including driver/rmt.h
will trigger the build warning below by default. The warning can be suppressed by the Kconfig option CONFIG_RMT_SUPPRESS_DEPRECATE_WARN.
The legacy RMT driver is deprecated, please use driver/rmt_tx.h and/or driver/rmt_rx.h
The major breaking changes in concept and usage are listed as follows:
Breaking Changes in Concepts
rmt_channel_t
which used to identify the hardware channel are removed from user space. In the new driver, RMT channel is represented byrmt_channel_handle_t
. The channel is dynamically allocated by the driver, instead of designated by user.rmt_item32_t
is replaced byrmt_symbol_word_t
, which avoids a nested union inside a struct.rmt_mem_t
is removed, as we don’t allow users to access RMT memory block (a.k.an RMTMEM) directly. Direct access to RMTMEM doesn’t make sense but make mistakes, especially when the RMT channel also connected with a DMA channel.rmt_mem_owner_t
is removed, as the ownership is controlled by driver, not by user anymore.rmt_source_clk_t
is replaced byrmt_clock_source_t
, and note they’re not binary compatible.rmt_data_mode_t
is removed, the RMT memory access mode is configured to always use Non-FIFO and DMA mode.rmt_mode_t
is removed, as the driver has stand alone install functions for TX and RX channels.rmt_idle_level_t
is removed, setting IDLE level for TX channel is available inrmt_transmit_config_t::eot_level
.rmt_carrier_level_t
is removed, setting carrier polarity is available inrmt_carrier_config_t::polarity_active_low
.rmt_channel_status_t
andrmt_channel_status_result_t
are removed, they’re not used anywhere.Transmitting by RMT channel doesn’t expect user to prepare the RMT symbols, instead, user needs to provide an RMT Encoder to tell the driver how to convert user data into RMT symbols.
Breaking Changes in Usage
Channel installation has been separated for TX and RX channels into
rmt_new_tx_channel()
andrmt_new_rx_channel()
.rmt_set_clk_div
andrmt_get_clk_div
are removed. Channel clock configuration can only be done during channel installation.rmt_set_rx_idle_thresh
andrmt_get_rx_idle_thresh
are removed. In the new driver, the RX channel IDLE threshold is redesigned into a new conceptrmt_receive_config_t::signal_range_max_ns
.rmt_set_mem_block_num
andrmt_get_mem_block_num
are removed. In the new driver, the memory block number is determined byrmt_tx_channel_config_t::mem_block_symbols
andrmt_rx_channel_config_t::mem_block_symbols
.rmt_set_tx_carrier
is removed, the new driver usesrmt_apply_carrier()
to set carrier behavior.rmt_set_mem_pd
andrmt_get_mem_pd
are removed. The memory power is managed by the driver automatically.rmt_memory_rw_rst
,rmt_tx_memory_reset
andrmt_rx_memory_reset
are removed. Memory reset is managed by the driver automatically.rmt_tx_start
andrmt_rx_start
are merged into a single functionrmt_enable()
, for both TX and RX channels.rmt_tx_stop
andrmt_rx_stop
are merged into a single functionrmt_disable()
, for both TX and RX channels.rmt_set_memory_owner
andrmt_get_memory_owner
are removed. RMT memory owner guard is added automatically by the driver.rmt_set_tx_loop_mode
andrmt_get_tx_loop_mode
are removed. In the new driver, the loop mode is configured inrmt_transmit_config_t::loop_count
.rmt_set_source_clk
andrmt_get_source_clk
are removed. Configuring clock source is only possible during channel installation byrmt_tx_channel_config_t::clk_src
andrmt_rx_channel_config_t::clk_src
.rmt_set_rx_filter
is removed. In the new driver, the filter threshold is redesigned into a new conceptrmt_receive_config_t::signal_range_min_ns
.rmt_set_idle_level
andrmt_get_idle_level
are removed. Setting IDLE level for TX channel is available inrmt_transmit_config_t::eot_level
.rmt_set_rx_intr_en
,rmt_set_err_intr_en
,rmt_set_tx_intr_en
,rmt_set_tx_thr_intr_en
andrmt_set_rx_thr_intr_en
are removed. The new driver doesn’t allow user to turn on/off interrupt from user space. Instead, it provides callback functions.rmt_set_gpio
andrmt_set_pin
are removed. The new driver doesn’t support to switch GPIO dynamically at runtime.rmt_config
is removed. In the new driver, basic configuration is done during the channel installation stage.rmt_isr_register
andrmt_isr_deregister
are removed, the interrupt is allocated by the driver itself.rmt_driver_install
is replaced byrmt_new_tx_channel()
andrmt_new_rx_channel()
.rmt_driver_uninstall
is replaced byrmt_del_channel()
.rmt_fill_tx_items
,rmt_write_items
andrmt_write_sample
are removed. In the new driver, user needs to provide an encoder to “translate” the user data into RMT symbols.rmt_get_counter_clock
is removed, as the channel clock resolution is configured by user fromrmt_tx_channel_config_t::resolution_hz
.rmt_wait_tx_done
is replaced byrmt_tx_wait_all_done()
.rmt_translator_init
,rmt_translator_set_context
andrmt_translator_get_context
are removed. In the new driver, the translator has been replaced by the RMT encoder.rmt_get_ringbuf_handle
is removed. The new driver doesn’t use Ringbuffer to save RMT symbols. Instead, the incoming data are saved to the user provided buffer directly. The user buffer can even be mounted to DMA link internally.rmt_register_tx_end_callback
is replaced byrmt_tx_register_event_callbacks()
, where user can registerrmt_tx_event_callbacks_t::on_trans_done
event callback.rmt_set_intr_enable_mask
andrmt_clr_intr_enable_mask
are removed, as the interrupt is handled by the driver, user doesn’t need to take care of it.rmt_add_channel_to_group
andrmt_remove_channel_from_group
are replaced by RMT sync manager. Please refer tormt_new_sync_manager()
.rmt_set_tx_loop_count
is removed. The loop count in the new driver is configured inrmt_transmit_config_t::loop_count
.rmt_enable_tx_loop_autostop
is removed. In the new driver, TX loop auto stop is always enabled if available, it’s not configurable anymore.
LCD
The LCD panel initialization flow is slightly changed. Now the
esp_lcd_panel_init()
won’t turn on the display automatically. User needs to callesp_lcd_panel_disp_on_off()
to manually turn on the display. Note, this is different from turning on backlight. With this breaking change, user can flash a predefined pattern to the screen before turning on the screen. This can help avoid random noise on the screen after a power on reset.esp_lcd_panel_disp_off()
is deprecated, please useesp_lcd_panel_disp_on_off()
instead.dc_as_cmd_phase
is removed. The SPI LCD driver currently doesn’t support a 9-bit SPI LCD. Please always use a dedicated GPIO to control the LCD D/C line.The way to register RGB panel event callbacks has been moved from the
esp_lcd_rgb_panel_config_t
into a separate APIesp_lcd_rgb_panel_register_event_callbacks()
. However, the event callback signature is not changed.Previous
relax_on_idle
flag inesp_lcd_rgb_panel_config_t
has been renamed intoesp_lcd_rgb_panel_config_t::refresh_on_demand
, which expresses the same meaning but with a clear name.If the RGB LCD is created with the
refresh_on_demand
flag enabled, the driver will not start a refresh in theesp_lcd_panel_draw_bitmap()
. Now users have to callesp_lcd_rgb_panel_refresh()
to refresh the screen by themselves.esp_lcd_color_space_t
is deprecated, please uselcd_color_space_t
to describe the color space, and uselcd_rgb_element_order_t
to describe the data order of RGB color.
Dedicated GPIO Driver
All of the dedicated GPIO related Low Level (LL) functions in
cpu_ll.h
have been moved todedic_gpio_cpu_ll.h
and renamed.
I2S driver
The I2S driver has been redesigned (see I2S Driver), which aims to rectify the shortcomings of the driver that were exposed when supporting all the new features of ESP32-C3 & ESP32-S3. The new driver’s APIs are available by including corresponding I2S mode’s header files driver/include/driver/i2s_std.h, driver/include/driver/i2s_pdm.h, or driver/include/driver/i2s_tdm.h.
Meanwhile, the old driver’s APIs in driver/deprecated/driver/i2s.h are still supported for backward compatibility. But there will be warnings if users keep using the old APIs in their projects, these warnings can be suppressed by the Kconfig option CONFIG_I2S_SUPPRESS_DEPRECATE_WARN.
Here is the general overview of the current I2S files:
Breaking changes in Concepts
Independent TX/RX channels
The minimum control unit in new I2S driver are now individual TX/RX channels instead of an entire I2S controller (that consistes of multiple channels).
The TX and RX channels of the same I2S controller can be controlled separately, meaning that they are configured such that they can be started or stopped separately.
The c:type:i2s_chan_handle_t handle type is used to uniquely identify I2S channels. All the APIs will require the channel handle and users need to maintain the channel handles by themselves.
On the ESP32-C3 and ESP32-S3, TX and RX channels in the same controller can be configured to different clocks or modes.
However, on the ESP32 and ESP32-S2, the TX and RX channels of the same controller still share some hardware resources. Thus, configurations may cause one channel to affect another channel in the same controller.
The channels can be registered to an available I2S controller automatically by setting
i2s_port_t::I2S_NUM_AUTO
as I2S port ID which will cause the driver to search for the available TX/RX channels. However, the driver also supports registering channels to a specific port.In order to distinguish between TX/RX channels and sound channels, the term ‘channel’ in the context of the I2S driver will only refer to TX/RX channels. Meanwhile, sound channels will be referred to as “slots”.
I2S Mode Categorization
I2S communication modes are categorized into the following three modes. Note that:
Standard mode: Standard mode always has two slots, it can support Philips, MSB, and PCM (short frame sync) formats. Please refer to driver/include/driver/i2s_std.h for more details.
PDM mode: PDM mode only supports two slots with 16-bit data width, but the configurations of PDM TX and PDM RX are slightly different. For PDM TX, the sample rate can be set by
i2s_pdm_tx_clk_config_t::sample_rate
, and its clock frequency depends on the up-sampling configuration. For PDM RX, the sample rate can be set byi2s_pdm_rx_clk_config_t::sample_rate
, and its clock frequency depends on the down-sampling configuration. Please refer to driver/include/driver/i2s_pdm.h for details.TDM mode: TDM mode can support up to 16 slots. It can work in Philips, MSB, PCM (short frame sync), and PCM (long frame sync) formats. Please refer to driver/include/driver/i2s_tdm.h for details.
When allocating a new channel in a specific mode, users should initialize that channel by its corresponding function. It is strongly recommended to use the helper macros to generate the default configurations in case the default values are changed in the future.
Independent Slot and Clock Configuration
The slot configurations and clock configurations can be configured separately.
Call
i2s_channel_init_std_mode()
,i2s_channel_init_pdm_rx_mode()
,i2s_channel_init_pdm_tx_mode()
, ori2s_channel_init_tdm_mode()
to initialize the slot/clock/gpio_pin configurations.Calling
i2s_channel_reconfig_std_slot()
,i2s_channel_reconfig_pdm_rx_slot()
,i2s_channel_reconfig_pdm_tx_slot()
, ori2s_channel_reconfig_tdm_slot()
can change the slot configurations after initialization.Calling
i2s_channel_reconfig_std_clock()
,i2s_channel_reconfig_pdm_rx_clock()
,i2s_channel_reconfig_pdm_tx_clock()
, ori2s_channel_reconfig_tdm_clock()
can change the clock configurations after initialization.Calling
i2s_channel_reconfig_std_gpio()
,i2s_channel_reconfig_pdm_rx_gpio()
,i2s_channel_reconfig_pdm_tx_gpio()
, ori2s_channel_reconfig_tdm_gpio()
can change the GPIO configurations after initialization.
Misc
States and state-machine are adopted in the new I2S driver to avoid APIs called in wrong state.
ADC and DAC modes are removed. They will only be supported in their own drivers and the legacy I2S driver.
Breaking Changes in Usage
To use the new I2S driver, please follow these steps:
Call
i2s_new_channel()
to acquire channel handles. We should specify the work role and I2S port in this step. Besides, the TX or RX channel handle will be generated by the driver. Inputting both two TX and RX channel handles is not necessary but at least one handle is needed. In the case of inputting both two handles, the driver will work at the duplex mode. Both TX and RX channels will be avaliable on a same port, and they will share the MCLK, BCLK and WS signal. But if only one of the TX or RX channel handle is inputted, this channel will only work in the simplex mode.Call
i2s_channel_init_std_mode()
,i2s_channel_init_pdm_rx_mode()
,i2s_channel_init_pdm_tx_mode()
ori2s_channel_init_tdm_mode()
to initialize the channel to the specified mode. Corresponding slot, clock and GPIO configurations are needed in this step.(Optional) Call
i2s_channel_register_event_callback()
to register the ISR event callback functions. I2S events now can be received by the callback function synchronously, instead of from the event queue asynchronously.Call
i2s_channel_enable()
to start the hardware of I2S channel. In the new driver, I2S won’t start automatically after installed, and users are supposed to know clearly whether the channel has started or not.Read or write data by
i2s_channel_read()
ori2s_channel_write()
. Certainly, only the RX channel handle is suppoesd to be inputted ini2s_channel_read()
and the TX channel handle ini2s_channel_write()
.(Optional) The slot, clock and GPIO configurations can be changed by corresponding ‘reconfig’ functions, but
i2s_channel_disable()
must be called before updating the configurations.Call
i2s_channel_disable()
to stop the hardware of I2S channel.Call
i2s_del_channel()
to delete and release the resources of the channel if it is not needed any more, but the channel must be disabled before deleting it.
TWAI Driver
The deprecated CAN
peripheral driver is removed. Please use TWAI
driver instead (i.e. include driver/twai.h
in your application).
Register Access Macros
Previously, all register access macros could be used as expressions, so the following was allowed:
uint32_t val = REG_SET_BITS(reg, mask);
In ESP-IDF v5.0, register access macros which write or read-modify-write the register can no longer be used as expressions, and can only be used as statements. This applies to the following macros: REG_WRITE
, REG_SET_BIT
, REG_CLR_BIT
, REG_SET_BITS
, REG_SET_FIELD
, WRITE_PERI_REG
, CLEAR_PERI_REG_MASK
, SET_PERI_REG_MASK
, SET_PERI_REG_BITS
.
To store the value which would have been written into the register, split the operation as follows:
uint32_t new_val = REG_READ(reg) | mask;
REG_WRITE(reg, new_val);
To get the value of the register after modification (which may be different from the value written), add an explicit read:
REG_SET_BITS(reg, mask);
uint32_t new_val = REG_READ(reg);