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61 lines
1.2 KiB
Markdown
61 lines
1.2 KiB
Markdown
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# SDIO workflow
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This README is a supplement to the comments in the SDIO slave driver. For more details, see `sdio_slave.c`.
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The diagram are described in mermaid format. You can view the diagrams on Github or with any mermaid renders.
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## Sending direction
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```mermaid
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sequenceDiagram
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actor task
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participant ISR
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participant HW
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Note right of HW: always: rx_done.raw = 1, rx_eof.ena= 1
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task-->>ISR: Prepare transfers
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task->>HW: rx_done.ena=1
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activate HW
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%% First ISR triggering transfer
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HW->>ISR: trigger
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activate ISR
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ISR->>HW: rx_done.ena=0
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deactivate HW
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loop every finished descriptor
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note over task, HW: skipped, see below
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end
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opt HW idle && new transfer prepared
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ISR->>HW: Load transfer
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end
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deactivate ISR
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activate HW
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HW->>HW: Host doing RX transfer
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deactivate HW
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HW->>HW: rx_eof.raw=1
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activate HW
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%% Second ISR recycling transfer
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HW->>ISR: trigger
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activate ISR
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ISR-->>HW: rx_done.ena=0
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loop every finished descriptor
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ISR->>HW: rx_eof.raw=0
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deactivate HW
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ISR-->>task: inform
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end
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opt HW idle && new transfer prepared
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note over ISR, HW: Load next transfer if there is...
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end
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deactivate ISR
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```
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