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 ADC2_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 disables 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 "CAN Configuration"

        config CAN_ISR_IN_IRAM
            bool "Place CAN ISR function into IRAM"
            default n
            select SUPPORT_STATIC_ALLOCATION
            # We need to enable FREERTOS_SUPPORT_STATIC_ALLOCATION because the
            # CAN 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 CAN 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 CAN_ALERT_AND_LOG flag)
                will have no effect.

    endmenu # CAN Configuration

endmenu  # Driver configurations