embedded communication_error ai_generated true

HAL_SPI_Transmit timeout: SPI TXE flag not set within timeout period

ID: embedded/spi-transfer-timeout

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85%Fix Rate
88%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
32 active — — —

Root Cause

SPI transfer times out waiting for TXE/RXNE flags. Clock not running, wrong mode, or NSS misconfiguration.

generic

Workarounds

  1. 92% success Verify SPI clock is enabled in RCC 
    __HAL_RCC_SPI1_CLK_ENABLE();  // must be called before any SPI init

    Sources: https://openocd.org/doc/html/

  2. 90% success Check SPI mode (CPOL/CPHA) matches the slave device 
    Check slave datasheet for clock polarity and phase. Mode 0 (CPOL=0,CPHA=0) is most common.
  3. 85% success Verify GPIO alternate function mapping for SCK, MOSI, MISO pins 
    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;  // AF mapping varies by STM32 family and pin

Dead Ends

Common approaches that don't work:

  1. Increase HAL timeout value 82% fail

    If SPI clock is not running, no timeout value will help. The peripheral itself is misconfigured.

  2. Switch from hardware NSS to software NSS without changing code 75% fail

    Hardware vs software NSS requires different GPIO and CR register configuration; just toggling the mode breaks CS.