kopia lustrzana https://github.com/espressif/esp-idf
57 wiersze
2.7 KiB
Plaintext
57 wiersze
2.7 KiB
Plaintext
menu "USB-OTG"
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visible if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3
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# Invisible item, enabled when USB_OTG peripheral does exist
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config USB_OTG_SUPPORTED
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bool
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default y if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32S3
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config USB_HOST_CONTROL_TRANSFER_MAX_SIZE
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depends on USB_OTG_SUPPORTED
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int "Largest size (in bytes) of transfers to/from default endpoints"
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default 256
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help
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Each USB device attached is allocated a dedicated buffer for its OUT/IN transfers to/from the device's
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control endpoint. The maximum size of that buffer is determined by this option. The limited size of the
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transfer buffer have the following implications:
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- The maximum length of control transfers is limited
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- Device's with configuration descriptors larger than this limit cannot be supported
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choice USB_HOST_HW_BUFFER_BIAS
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depends on USB_OTG_SUPPORTED
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prompt "Hardware FIFO size biasing"
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default USB_HOST_HW_BUFFER_BIAS_BALANCED
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help
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The underlying hardware has size adjustable FIFOs to cache USB packets on reception (IN) or for
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transmission (OUT). The size of these FIFOs will affect the largest MPS (maximum packet size) and the
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maximum number of packets that can be cached at any one time. The hardware contains the following
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FIFOS: RX (for all IN packets), Non-periodic TX (for Bulk and Control OUT packets), and Periodic TX
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(for Interrupt and Isochronous OUT packets). This configuration option allows biasing the FIFO sizes
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towards a particular use case, which may be necessary for devices that have endpoints with large MPS.
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The MPS limits for each biasing are listed below:
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Balanced:
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- IN (all transfer types), 408 bytes
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- OUT non-periodic (Bulk/Control), 192 bytes (i.e., 3 x 64 byte packets)
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- OUT periodic (Interrupt/Isochronous), 192 bytes
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Bias IN:
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- IN (all transfer types), 600 bytes
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- OUT non-periodic (Bulk/Control), 64 bytes (i.e., 1 x 64 byte packets)
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- OUT periodic (Interrupt/Isochronous), 128 bytes
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Bias Periodic OUT:
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- IN (all transfer types), 128 bytes
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- OUT non-periodic (Bulk/Control), 64 bytes (i.e., 1 x 64 byte packets)
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- OUT periodic (Interrupt/Isochronous), 600 bytes
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config USB_HOST_HW_BUFFER_BIAS_BALANCED
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bool "Balanced"
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config USB_HOST_HW_BUFFER_BIAS_IN
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bool "Bias IN"
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config USB_HOST_HW_BUFFER_BIAS_PERIODIC_OUT
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bool "Periodic OUT"
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endchoice
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endmenu #USB-OTG
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