esp-idf/components/driver/Kconfig

menu "Driver configurations"

    menu "ADC configuration"

        config ADC_FORCE_XPD_FSM
            bool "Use the FSM to control ADC power"
            default n
            help
                ADC power can be controlled by the FSM instead of software. This allows the ADC to
                be shut off when it is not working leading to lower power consumption. However
                using the FSM control ADC power will increase the noise of ADC.

        config ADC_DISABLE_DAC
            bool "Disable DAC when ADC2 is used on GPIO 25 and 26"
            default y
            help
                If this is set, the ADC2 driver will disable the output of the DAC corresponding to the specified
                channel. This is the default value.

                For testing, disable this option so that we can measure the output of DAC by internal ADC.

    endmenu  # ADC Configuration

    menu "SPI configuration"

        config SPI_MASTER_IN_IRAM
            bool "Place transmitting functions of SPI master into IRAM"
            default n
            select SPI_MASTER_ISR_IN_IRAM
            help
                Normally only the ISR of SPI master is placed in the IRAM, so that it
                can work without the flash when interrupt is triggered.
                For other functions, there's some possibility that the flash cache
                miss when running inside and out of SPI functions, which may increase
                the interval of SPI transactions.
                Enable this to put ``queue_trans``, ``get_trans_result`` and
                ``transmit`` functions into the IRAM to avoid possible cache miss.

                During unit test, this is enabled to measure the ideal case of api.

        config SPI_MASTER_ISR_IN_IRAM
            bool "Place SPI master ISR function into IRAM"
            default y
            help
                Place the SPI master ISR in to IRAM to avoid possible cache miss.

                Also you can forbid the ISR being disabled during flash writing
                access, by add ESP_INTR_FLAG_IRAM when initializing the driver.

        config SPI_SLAVE_IN_IRAM
            bool "Place transmitting functions of SPI slave into IRAM"
            default n
            select SPI_SLAVE_ISR_IN_IRAM
            help
                Normally only the ISR of SPI slave is placed in the IRAM, so that it
                can work without the flash when interrupt is triggered.
                For other functions, there's some possibility that the flash cache
                miss when running inside and out of SPI functions, which may increase
                the interval of SPI transactions.
                Enable this to put ``queue_trans``, ``get_trans_result`` and
                ``transmit`` functions into the IRAM to avoid possible cache miss.

        config SPI_SLAVE_ISR_IN_IRAM
            bool "Place SPI slave ISR function into IRAM"
            default y
            help
                Place the SPI slave ISR in to IRAM to avoid possible cache miss.

                Also you can forbid the ISR being disabled during flash writing
                access, by add ESP_INTR_FLAG_IRAM when initializing the driver.

    endmenu # SPI Configuration

    menu "TWAI configuration"

        config TWAI_ISR_IN_IRAM
            bool "Place TWAI ISR function into IRAM"
            default n
            select FREERTOS_SUPPORT_STATIC_ALLOCATION
            # We need to enable FREERTOS_SUPPORT_STATIC_ALLOCATION because the
            # TWAI driver requires the use of FreeRTOS Queues and Semaphores from
            # the driver ISR. These Queues and Semaphores need to be placed in
            # DRAM thus FreeRTOS static allocation API is required.
            help
                Place the TWAI ISR in to IRAM. This will allow the ISR to avoid
                cache misses, and also be able to run whilst the cache is disabled
                (such as when writing to SPI Flash).
                Note that if this option is enabled:
                - Users should also set the ESP_INTR_FLAG_IRAM in the driver
                configuration structure when installing the driver (see docs for
                specifics).
                - Alert logging (i.e., setting of the TWAI_ALERT_AND_LOG flag)
                will have no effect.

        config TWAI_ERRATA_FIX_BUS_OFF_REC
            bool "Add SW workaround for REC change during bus-off"
            depends on IDF_TARGET_ESP32
            default n
            help
                When the bus-off condition is reached, the REC should be reset to 0 and frozen (via LOM) by the
                driver's ISR. However on the ESP32, there is an edge case where the REC will increase before the
                driver's ISR can respond in time (e.g., due to the rapid occurrence of bus errors), thus causing the
                REC to be non-zero after bus-off. A non-zero REC can prevent bus-off recovery as the bus-off recovery
                condition is that both TEC and REC become 0. Enabling this option will add a workaround in the driver
                to forcibly reset REC to zero on reaching bus-off.

        config TWAI_ERRATA_FIX_TX_INTR_LOST
            bool "Add SW workaround for TX interrupt lost errata"
            depends on IDF_TARGET_ESP32
            default n
            help
                On the ESP32, when a transmit interrupt occurs, and interrupt register is read on the same APB clock
                cycle, the transmit interrupt could be lost. Enabling this option will add a workaround that checks the
                transmit buffer status bit to recover any lost transmit interrupt.

        config TWAI_ERRATA_FIX_RX_FRAME_INVALID
            bool "Add SW workaround for invalid RX frame errata"
            depends on IDF_TARGET_ESP32
            default n
            help
                On the ESP32, when receiving a data or remote frame, if a bus error occurs in the data or CRC field,
                the data of the next received frame could be invalid. Enabling this option will add a workaround that
                will reset the peripheral on detection of this errata condition. Note that if a frame is transmitted on
                the bus whilst the reset is ongoing, the message will not be receive by the peripheral sent on the bus
                during the reset, the message will be lost.

        config TWAI_ERRATA_FIX_RX_FIFO_CORRUPT
            bool "Add SW workaround for RX FIFO corruption errata"
            depends on IDF_TARGET_ESP32
            default n
            help
                On the ESP32, when the RX FIFO overruns and the RX message counter maxes out at 64 messages, the entire
                RX FIFO is no longer recoverable. Enabling this option will add a workaround that resets the peripheral
                on detection of this errata condition. Note that if a frame is being sent on the bus during the reset
                bus during the reset, the message will be lost.

    endmenu # TWAI Configuration

    menu "UART configuration"

        config UART_ISR_IN_IRAM
            bool "Place UART ISR function into IRAM"
            default n
            select FREERTOS_SUPPORT_STATIC_ALLOCATION
            help
                If this option is not selected, UART interrupt will be disabled for a long time and
                may cause data lost when doing spi flash operation.

    endmenu # UART Configuration

    menu "RTCIO configuration"
        visible if IDF_TARGET_ESP32

        config RTCIO_SUPPORT_RTC_GPIO_DESC
            bool "Support array `rtc_gpio_desc` for ESP32"
            depends on IDF_TARGET_ESP32
            default n
            help
                The the array `rtc_gpio_desc` will don't compile by default.
                If this option is selected, the array `rtc_gpio_desc` can be compile.
                If user use this array, please enable this configuration.

    endmenu # RTCIO Configuration

endmenu  # Driver configurations