(nuttx) branch master updated: imxrt/lpspi: Fix correct LPSPI DMA transfer size for 16-bit

[acassis]

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acassis pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new fc1ae9b7bec imxrt/lpspi: Fix correct LPSPI DMA transfer size for 16-bit
fc1ae9b7bec is described below

commit fc1ae9b7becd31b4e966aee2e7ebfc263e942701
Author: Atsunori Saito <s...@yedo.com>
AuthorDate: Tue Feb 17 14:10:32 2026 +0900

    imxrt/lpspi: Fix correct LPSPI DMA transfer size for 16-bit
    
    - Fix byte count calculation for 16-bit SPI words
      using shift-by-1 instead of shift-by-2
    - Use word count instead of byte count for DMA
      iteration config on both RX and TX channels
    
    Signed-off-by: Atsunori Saito <s...@yedo.com>
---
 arch/arm/src/imxrt/imxrt_lpspi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/src/imxrt/imxrt_lpspi.c b/arch/arm/src/imxrt/imxrt_lpspi.c
index d90b7757f22..9d0617ded62 100644
--- a/arch/arm/src/imxrt/imxrt_lpspi.c
+++ b/arch/arm/src/imxrt/imxrt_lpspi.c
@@ -1475,7 +1475,7 @@ static void imxrt_lpspi_exchange(struct spi_dev_s *dev,
 
   /* Convert the number of word to a number of bytes */
 
-  nbytes = (priv->nbits > 8) ? nwords << 2 : nwords;
+  nbytes = (priv->nbits > 8) ? nwords << 1 : nwords;
 
   /* Invalid DMA channels fall back to non-DMA method. */
 
@@ -1526,7 +1526,7 @@ static void imxrt_lpspi_exchange(struct spi_dev_s *dev,
   config.daddr  = (uint32_t) (rxbuffer ? rxbuffer : rxdummy);
   config.soff   = 0;
   config.doff   = rxbuffer ? adjust : 0;
-  config.iter   = nbytes;
+  config.iter   = nwords;
   config.flags  = EDMA_CONFIG_LINKTYPE_LINKNONE;
   config.ssize  = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;
   config.dsize  = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;
@@ -1540,7 +1540,7 @@ static void imxrt_lpspi_exchange(struct spi_dev_s *dev,
   config.daddr  = priv->spibase + IMXRT_LPSPI_TDR_OFFSET;
   config.soff   = txbuffer ? adjust : 0;
   config.doff   = 0;
-  config.iter   = nbytes;
+  config.iter   = nwords;
   config.flags  = EDMA_CONFIG_LINKTYPE_LINKNONE;
   config.ssize  = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;
   config.dsize  = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;