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spi: specify expectations regarding peripheral state between transactions

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评估

难度
5/5
预计耗时
一周以上
新手友好度
25/100
Issue 类型
功能
描述清晰度
需要澄清
活跃度
停滞
技术栈
rust
领域
embedded-iot

调研方向

Start by reviewing the SPI device traits and transaction abstraction described in the issue, then compare HAL behavior for transactions and DMA transactions. Determine how expectations for peripheral state between transactions should be specified across implementations; done means generic device drivers can rely on a defined bus state during multi-transaction communication sequences.

由索引模型根据 Issue 内容生成。

描述

Currently, SPI device traits deal with a transaction concept, which implies transmission of some data, while the CS is set for the whole duration. There is currently no guidance on how should the peripheral behave between transactions.

Issue

Certain SPI devices require bus synchronization, which means that the bus must not be disabled for the entire communication sequence and all lines must be kept in a known state (especially CLK). Communications sequence spans multiple SPI transactions.

Cause

Some HAL implementations disable SPI after each transaction, some don't. Some do it only after DMA transaction, some do it after each transaction. This unpredictable behavior of bus lanes, prevents a creation of generic device drivers that require synchronization.

Proposed solution

Embedded-hal should allow for specifying certain expectations regarding SPI bus state, to allow for correct behavior of device drivers for different HAL implementations.

主要语言
Rust
星标
2.7k
派生
283
PR 合并指标
30 天内没有已合并 PR

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