diff options
| -rw-r--r-- | stmhal/spi.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/stmhal/spi.c b/stmhal/spi.c index da24b701fc..19c36d0a3b 100644 --- a/stmhal/spi.c +++ b/stmhal/spi.c @@ -290,12 +290,14 @@ void spi_deinit(SPI_HandleTypeDef *spi) { } STATIC HAL_StatusTypeDef spi_wait_dma_finished(SPI_HandleTypeDef *spi, uint32_t timeout) { + // Note: we can't use WFI to idle in this loop because the DMA completion + // interrupt may occur before the WFI. Hence we miss it and have to wait + // until the next sys-tick (up to 1ms). uint32_t start = HAL_GetTick(); while (HAL_SPI_GetState(spi) != HAL_SPI_STATE_READY) { if (HAL_GetTick() - start >= timeout) { return HAL_TIMEOUT; } - __WFI(); } return HAL_OK; } |