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feat(driver_spi): 3wire sio mode support on slave_hd mode

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Wan Lei
2026-06-24 18:00:30 +08:00
parent 7bc0fc6870
commit c19e3df6c9
9 changed files with 89 additions and 176 deletions
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docs/en/api-reference/peripherals/spi_slave_hd.rst
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@@ -48,6 +48,8 @@ Call :cpp:func:`spi_slave_hd_init` to initialize the SPI bus as well as the peri
The :cpp:type:`spi_bus_config_t` specifies how the bus should be initialized, while :cpp:type:`spi_slave_hd_slot_config_t` specifies how the SPI Slave driver should work.
To use 3-wire mode, also known as single I/O (SIO) mode, set :c:macro:`SPI_SLAVE_HD_3WIRE_MODE` in :cpp:member:`spi_slave_hd_slot_config_t::flags`. In this mode, MOSI is used for both input and output data, so :cpp:member:`spi_bus_config_t::mosi_io_num` must be set to an output-capable GPIO. The MISO line is not used and :cpp:member:`spi_bus_config_t::miso_io_num` can be set to ``-1``. The master should use the 1-bit SPI Slave HD commands in this mode. Commands with DIO/QIO masks will select 2-line or 4-line data phases in hardware and are not compatible with 3-wire mode, resulting in data errors.
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