esp-idf/examples/peripherals/sdio/host/main/Kconfig.projbuild

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menu "Example Configuration"
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config EXAMPLE_SDIO_OVER_SPI
bool "Host use SPI bus to communicate with slave"
default n
help
If this is set, the host tries using SPI bus to communicate with slave.
Otherwise, the standarad SD bus is used.
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config EXAMPLE_SDIO_4BIT
bool "Host tries using 4-bit mode to communicate with slave"
default n
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depends on !EXAMPLE_SDIO_OVER_SPI
help
If this is set, the host tries using 4-bit mode to communicate with
slave. If failed, the communication falls back to 1-bit mode.
If this is not set, the host uses 1-bit mode. However, CMD1 is still
mandatory for interrupts.
Note that 4-bit mode is not compatible (by default) if the slave is
using 3.3V flash which requires a pull-down on the MTDI pin.
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config EXAMPLE_SDIO_HIGHSPEED
bool "Host tries using HS mode to communicate with slave"
default y
help
If this is set, the host tries using high-speed mode to communicate
with slave. If the slave doesn't support high-speed mode, the
communication falls back to default-speed mode. If this is not set,
the host uses DS mode.
If the example does not work, please try disabling the HS mode.
config EXAMPLE_NO_INTR_LINE
bool "The host is not connected to the interrupt line (DAT1) of slave"
default n
help
If this is set, the host example will not check the interrupt line but poll slave
registers to see whether the slave has interrupts for the host.
Working without the interrupt line may increase the CPU load of the host, and do harm
to the response speed to slave events, though can save 1 GPIO for other purposes in
non-4-bit mode.
choice EXAMPLE_SLAVE
prompt "GPIO to control slave EN in Espressif master-slave board."
default EXAMPLE_SLAVE_NONE
help
If Espressif master-slave board is used, select the correct GPIO to control slave's EN.
config EXAMPLE_SLAVE_NONE
bool "Not using Espressif master-slave board."
config EXAMPLE_SLAVE_B1
bool "Using slave B1"
endchoice
config EXAMPLE_SLAVE_PWR_NEGTIVE_ACTIVE
bool "Slave power control pin is negtive active, otherwise postive active"
depends on !EXAMPLE_SLAVE_NONE
default n
help
Slave power control pin is negtive active, otherwise postive active
endmenu