# Peripherals

[中文]

## Common Changes

### Legacy Driver Dependencies Removal

The legacy driver component driver has been deprecated and no longer contains public dependencies on the following driver components:

- esp_driver_ana_cmpr

- esp_driver_dac

- esp_driver_gptimer

- esp_driver_i2s

- esp_driver_ledc

- esp_driver_mcpwm

- esp_driver_parlio

- esp_driver_pcnt

- esp_driver_rmt

- esp_driver_sdio

- esp_driver_sdm

- esp_driver_sdmmc

- esp_driver_sdspi

- esp_driver_spi

- esp_driver_tsens

- esp_driver_twai

- esp_driver_uart

- esp_driver_usb_serial_jtag

If your project uses legacy driver component, it is strongly recommended to remove driver component dependencies, and add new driver component (usually `esp_driver_xxx`) dependencies to your project.

If you still need to keep legacy driver component (e.g. your project depends on the legacy `i2c` driver), please keep the driver component remaining in the dependency list of your project (usually `<project_root>/main/CMakeLists.txt`), and manually add component dependencies that are no longer included in driver as needed.

### All drivers' `io_loop_back` configuration have been removed

Different driver objects can share the same GPIO number, enabling more complex functionalities. For example, you can bind the TX and RX channels of the RMT peripheral to the same GPIO to simulate 1-Wire bus read and write timing. In previous versions, you needed to configure the `io_loop_back` setting in the driver to achieve this "loopback" functionality. Now, this configuration has been removed. Simply configuring the same GPIO number in different drivers will achieve the same functionality.

### Peripheral Clock Gating

Peripheral clock gating is managed within the driver layer. Users do not need to manually handle peripheral module clock gating. Its corresponding APIs are included via a private header file `esp_private/periph_ctrl.h`. There used to be another header file `driver/periph_ctrl.h` for the same purpose, which is now removed.

### RTC Subsystem Control

Low power modules usually share some common resources like interrupt number. To avoid conflicts, some private APIs are created in the `esp_private/rtc_ctrl.h` header file to manage these shared resources with ease. There used to be another header file `driver/rtc_cntl.h` for the same purpose, which is now removed.

## ADC

The legacy ADC driver `driver/adc.h` is deprecated since version 5.0 (see ADC). Starting from version 6.0, the legacy driver is completely removed. The new driver is placed in the esp_adc, and the header file path is `esp_adc/adc_oneshot.h`, `esp_adc/adc_continuous.h`, `esp_adc/adc_cali.h` and `esp_adc/adc_cali_scheme.h`.

## RMT

The `io_od_mode` member in the `rmt_tx_channel_config_t` configuration structure has been removed. If you want to use open-drain mode, you need to manually call the `gpio_od_enable()` function.

## GPIO

`gpio_iomux_in()` and `gpio_iomux_out()` have been replaced by `gpio_iomux_input()` and `gpio_iomux_output()`, and have been moved to `esp_private/gpio.h` header file as private APIs for internal use only.

## LEDC

- `ledc_timer_set()` has been removed. Use `ledc_timer_config()` or `ledc_set_freq()` instead.

- `LEDC_APB_CLK_HZ` and `LEDC_REF_CLK_HZ` have been removed.

- `LEDC_SLOW_CLK_RTC8M` macro has been removed. Please use `LEDC_SLOW_CLK_RC_FAST` instead.

- Removed esp_driver_gpio as a public required component from esp_driver_ledc.

- `ledc_isr_register()` has been deprecated. LEDC interrupt handling is implemented by driver itself, please only register event callbacks if necessary.

- `ledc_channel_config_t::intr_type` has been deprecated. LEDC_INTR_FADE_END interrupt enable / disable control is handled by the driver internally. Users can still register a callback for this interrupt by `ledc_cb_register()`.

- `soc_periph_ledc_clk_src_legacy_t::LEDC_USE_RTC8M_CLK` has been removed. Please use `LEDC_USE_RC_FAST_CLK` instead.

## UART

`UART_FIFO_LEN` macro has been removed. Please use `UART_HW_FIFO_LEN` instead.

## I2C

### Legacy I2C Driver End-of-Life

Warning

The legacy I2C driver (`driver/i2c.h`) has been marked as End-of-Life (EOL) in ESP-IDF v6.0 and is scheduled for removal in v7.0.

- ESP-IDF will not provide updates, bug fixes, or security patches for the legacy driver timely.

- Users are strongly recommended to migrate to the new I2C drivers: `driver/i2c_master.h` and `driver/i2c_slave.h`.

- To temporarily suppress the compile-time warning, enable `Component config` > `Legacy Driver Configurations` > `Legacy I2C Driver Configurations` > `Suppress legacy driver deprecated warning` in menuconfig.

The new I2C drivers provide improved slave and master functionality. For details, please refer to the I2C Migration Guide and the I2C Driver Programming Guide.

### I2C Slave Driver Updates

The I2C slave driver has been redesigned in v5.4. In the current version, the old I2C slave driver has been removed.

#### Major Changes in Concepts

- Previously, the I2C slave driver performed active read and write operations. In the new version, these operations are handled passively via callbacks triggered by master events, aligning with standard I2C slave behavior.

#### Major Changes in Usage

- `i2c_slave_receive` has been removed. In the new driver, data reception is handled via callbacks.

- `i2c_slave_transmit` has been replaced by `i2c_slave_write`.

- `i2c_slave_write_ram` has been removed.

- `i2c_slave_read_ram` has been removed.

### I2C Master Driver Updates

The I2C master driver also has some changes in its API definitions.

#### Major Changes in Usage

Following functions now will return `ESP_ERR_INVALID_RESPONSE` instead of `ESP_ERR_INVALID_STATE` when NACK from the bus is detected:

- `i2c_master_transmit`

- `i2c_master_multi_buffer_transmit`

- `i2c_master_transmit_receive`

- `i2c_master_execute_defined_operations`

## Legacy Timer Group Driver is Removed

The legacy timer group driver `driver/timer.h` is deprecated since version 5.0 (see Legacy Timer Group Driver is Deprecated). Starting from version 6.0, the legacy driver is completely removed. The new driver is placed in the esp_driver_gptimer, and the header file path is `driver/gptimer.h`.

## Legacy I2S Driver is Removed

- The legacy i2s driver `driver/i2s.h` is deprecated since version 5.0 (see I2S Driver). Starting from version 6.0, the legacy driver is completely removed. The new driver is placed in the esp_driver_i2s, and the header file path is `driver/i2s_std.h`, `driver/i2s_pdm.h` and `driver/i2s_tdm.h`.

- API `i2s_set_adc_mode`, `i2s_adc_enable` and `i2s_adc_disable` are deprecated since version 5.0. Starting from version 6.0, these APIs are completely removed.

## Legacy RMT Driver is Removed

The legacy RMT driver `driver/rmt.h` is deprecated since version 5.0 (see Legacy RMT Driver is Deprecated). Starting from version 6.0, the legacy driver is completely removed. The new driver is placed in the esp_driver_rmt, and the header file path is `driver/rmt_tx.h`, `driver/rmt_rx.h` and `driver/rmt_encoder.h`.

## GDMA

- The `GDMA_ISR_IRAM_SAFE` Kconfig option has been removed due to potential risks. Now, the interrupt behavior of different DMA channels during Cache disabled periods are independent of each other.

- `gdma_new_channel` is removed. When requesting a GDMA channel, use either `gdma_new_ahb_channel` or `gdma_new_axi_channel` according to the bus type.

- The `sram_trans_align` and `psram_trans_align` members have been removed from `async_memcpy_config_t`. Use `async_memcpy_config_t::dma_burst_size` to set the DMA burst transfer size.

- The `esp_dma_capable_malloc` and `esp_dma_capable_calloc` functions have been removed. Use `heap_caps_malloc()` and `heap_caps_calloc()` from heap/include/esp_heap_caps.h with `MALLOC_CAP_DMA|MALLOC_CAP_CACHE_ALIGNED` to allocate memory suitable for DMA and cache alignment.

## SDMMC

- The `get_dma_info` member in the `sdmmc_host_t` structure, as well as the `sdspi_host_get_dma_info` and `sdmmc_host_get_dma_info` functions, have been removed. DMA configuration is now handled internally by the driver.

## Legacy Temperature Sensor Driver is Removed

The legacy temperature sensor driver `driver/temp_sensor.h` is deprecated since version 5.0 (see Legacy Temperature Sensor Driver is Deprecated). Starting from version 6.0, the legacy driver is completely removed. The new driver is placed in the esp_driver_tsens, and the header file path is `driver/temperature_sensor.h`.

## Legacy Sigma-Delta Modulator Driver is Removed

The legacy Sigma-Delta Modulator driver `driver/sigmadelta.h` is deprecated since version 5.0 (see Legacy Sigma-Delta Modulator Driver is Deprecated). Starting from version 6.0, the legacy driver is completely removed. The new driver is placed in the esp_driver_sdm, and the header file path is `driver/sdm.h`.

## LCD

- The GPIO number type in the LCD driver has been changed from `int` to the more type-safe `gpio_num_t`. For example, instead of using `5` as the GPIO number, you now need to use `GPIO_NUM_5`.

- The `psram_trans_align` and `sram_trans_align` members in the `esp_lcd_i80_bus_config_t` structure have been replaced by the `esp_lcd_i80_bus_config_t::dma_burst_size` member, which sets the DMA burst transfer size.

- The `psram_trans_align` and `sram_trans_align` members in the `esp_lcd_rgb_panel_config_t` structure have also been replaced by the `esp_lcd_rgb_panel_config_t::dma_burst_size` member for configuring the DMA burst transfer size.

- The `color_space` and `rgb_endian` configuration options in the `esp_lcd_panel_dev_config_t` structure have been replaced by the `esp_lcd_panel_dev_config_t::rgb_ele_order` member, which sets the RGB element order. The corresponding types `lcd_color_rgb_endian_t` and `esp_lcd_color_space_t` have also been removed; use `lcd_rgb_element_order_t` instead.

- The `esp_lcd_panel_disp_off` function has been removed. Please use the `esp_lcd_panel_disp_on_off()` function to control display on/off.

- The `on_bounce_frame_finish` member in `esp_lcd_rgb_panel_event_callbacks_t` has been replaced by `esp_lcd_rgb_panel_event_callbacks_t::on_frame_buf_complete`, which indicates that a complete frame buffer has been sent to the LCD controller.

- The LCD IO layer driver for the I2C interface previously had two implementations, based on the new and legacy I2C master bus drivers. As the legacy I2C driver is being deprecated, support for it in the LCD IO layer has been removed. Only the APIs provided in `driver/i2c_master.h` are now used.

- `esp_lcd_dpi_panel_config_t::pixel_format` member is deprecated. It is recommended to only use `esp_lcd_dpi_panel_config_t::in_color_format` to set the MIPI DSI driver's input pixel data format.

- The NT35510 LCD device driver has been moved out of ESP-IDF and is now hosted in the ESP Component Registry. If your project uses the NT35510 driver, you can add it to your project by running `idf.py add-dependency "espressif/esp_lcd_nt35510"`.

## SPI

- The CONFIG_SPI_MASTER_IN_IRAM option is now invisible by default in menuconfig and depends on CONFIG_FREERTOS_IN_IRAM. This change was made to prevent potential crashes when SPI functions in IRAM call FreeRTOS functions that are placed in flash.

- To enable SPI master IRAM optimization:

  > 1. Navigate to `Component config` → `FreeRTOS` → `Port` in menuconfig.

  > 2. Enable `Place FreeRTOS functions in IRAM` (CONFIG_FREERTOS_IN_IRAM).

  > 3. Navigate to `Component config` → `ESP-Driver:SPI Configurations` in menuconfig.

  > 4. Enable `Place transmitting functions of SPI master into IRAM` (CONFIG_SPI_MASTER_IN_IRAM).

  > Note

  > Note that enabling CONFIG_FREERTOS_IN_IRAM will increase IRAM usage. Consider this trade-off when optimizing for SPI performance.

- Deprecated HSPI and VSPI related IOMUX pin macros on ESP32 and ESP32S2 have been removed.

## PSRAM

Deprecated header file `esp_spiram.h` has been removed. Please use `esp_psram.h` instead.

## SPI Flash Driver

- Deprecated `enum` type `esp_flash_speed_t` has been removed. The main flash speed is controlled by CONFIG_ESPTOOLPY_FLASHFREQ option.

- Deprecated header file `esp_spi_flash.h` has been removed. Please use `spi_flash_mmap.h` instead.

- Deprecated API `spi_flash_dump_counters` has been removed. Please use `esp_flash_dump_counters()` instead.

- Deprecated API `spi_flash_get_counters` has been removed. Please use `esp_flash_get_counters()` instead.

- Deprecated API `spi_flash_reset_counters` has been removed. Please use `esp_flash_reset_counters()` instead.

- Kconfig option `CONFIG_SPI_FLASH_ROM_DRIVER_PATCH` has been removed. Considering that this option is unlikely to be widely used by users and may cause serious issues if misused, it has been decided to remove it.

Note

Note that enabling CONFIG_FREERTOS_IN_IRAM will increase IRAM usage. Consider this trade-off when optimizing for SPI performance.

## Touch Element

The `touch_element` component is moved to ESP Component Registry.

You can add this dependency to your project by running `idf.py add-dependency "espressif/touch_element"`.

## Touch Sensor

The `touch_sensor_sample_config_t::bypass_shield_output` member for version 3 touch sensor has been removed because it is not supported in the version 3 hardware.

The dependencies of legacy touch sensor driver are removed from ULP touch driver, now you need to use `int` instead of `touch_pad_t` to indicate the touch channel ID.

## I2S

- `i2s_port_t` type has been removed. Please use `int` type instead. Its enum items `I2S_NUM_0`, `I2S_NUM_1`, `I2S_NUM_2` and `I2S_NUM_AUTO` have been replaced by macro definitions to ensure compatibility.

## USB

The `usb` component has been moved to ESP Component Registry.

You can add this dependency to your project by running `idf.py add-dependency "espressif/usb"`.

Was this page helpful?

- Thank you! We received your feedback.
- If you have any comments, fill in Espressif Documentation Feedback Form.

- We value your feedback.
- Let us know how we can improve this page by filling in Espressif Documentation Feedback Form.