SPI_DMA_INCOMPLETE embedded data_error ai_generated partial

SPI: DMA传输不完整，通道1上预期256字节但仅接收128字节

SPI: DMA transfer incomplete, expected 256 bytes but only 128 bytes received on channel 1

ID: embedded/spi-dma-transfer-incomplete

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80%修复率
87%置信度
1证据数
2023-09-05首次发现

版本兼容性

版本状态引入弃用备注
STM32Cube_FW_F7 v1.17.0 active — — —
STM32Cube_FW_G4 v1.6.0 active — — —
DMA HAL Driver v2.3.0 active — — —

根因分析

SPI DMA传输因超时、FIFO溢出或从设备在传输中途取消片选而过早终止。

English

The SPI DMA transfer was prematurely terminated due to a timeout, FIFO overflow, or slave device deasserting chip select mid-transfer.

generic

官方文档

https://www.st.com/resource/en/application_note/an4031-dma-controller-application-examples-stmicroelectronics.pdf

解决方案

  1. Add a DMA transfer complete callback (HAL_SPI_TxRxCpltCallback) to verify the received byte count and re-initiate the transfer if incomplete.
  2. Enable SPI CRC checking to detect data corruption and retry the transfer on CRC mismatch.

无效尝试

常见但无效的做法:

  1. Increase the SPI clock speed to transfer data faster 80% 失败

    Higher clock speed can exacerbate timing issues and cause more FIFO overflows, worsening the problem.

  2. Disable DMA and use polling SPI transfer instead 75% 失败

    Polling transfers can block the CPU for long periods, causing real-time task failures and still not resolving the root cause of incomplete transfers.