Mirrors/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2026-10-02 03:00:34 +03:00
Code Issues Packages Projects Releases Wiki Activity

feature(driver_spi): slave driver support psram transfer

Browse Source
This commit is contained in:
wanckl
2026-02-06 15:47:45 +08:00
committed by Wan Lei
parent f0f448ee4b
commit dd9a5b7719
20 changed files with 313 additions and 214 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/en/api-reference/peripherals/spi_slave.rst
+8
View File
@@ -79,6 +79,14 @@ As not every transaction requires both writing and reading data, you can choose
A Host should not start a transaction before its Device is ready for receiving data. It is recommended to use another GPIO pin for a handshake signal to sync the Devices. For more details, see :ref:`transaction_interval`.
.. only:: SOC_PSRAM_DMA_CAPABLE
Using PSRAM for DMA transfer
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SPI Slave driver supports using PSRAM for DMA transfer. Directly passing a PSRAM address as :cpp:member:`spi_slave_transaction_t::tx_buffer` or :cpp:member:`spi_slave_transaction_t::rx_buffer` is supported. For the rx_buffer, it has alignment requirements, using :cpp:func:`heap_caps_malloc` to allocate memory can automatically handle the alignment requirements. For the buffers that you can not control, you can also use the :c:macro:`SPI_SLAVE_TRANS_DMA_BUFFER_ALIGN_AUTO` flag to enable driver to automatically align the buffer from PSRAM.
Note that this feature shares the MSPI bus bandwidth (bus frequency * bus width), so the transmission bandwidth of the host to this device should be less than the PSRAM bandwidth, otherwise **data may be lost**, and the ``spi_slave_transmit`` function will return the :c:macro:`ESP_ERR_INVALID_STATE` error.
Driver Usage
------------