[incubator-nuttx] 04/05: imxrt:lpi2c Fix interrupt storm on failed write.

[da...@apache.org]

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davids5 pushed a commit to branch master_imxrt
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git

commit 3dcd238d5e81b7f2ba987e32d5623cd1d89aa446
Author: David Sidrane <Da...@NscDg.com>
AuthorDate: Thu Dec 12 16:29:42 2019 -0800

    imxrt:lpi2c Fix interrupt storm on failed write.
    
       The SDF was not acked if ther was an error
       on the last write.
---
 arch/arm/src/imxrt/imxrt_lpi2c.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm/src/imxrt/imxrt_lpi2c.c b/arch/arm/src/imxrt/imxrt_lpi2c.c
index 2a90c16..20c0f80 100644
--- a/arch/arm/src/imxrt/imxrt_lpi2c.c
+++ b/arch/arm/src/imxrt/imxrt_lpi2c.c
@@ -1245,11 +1245,17 @@ static int imxrt_lpi2c_isr_process(struct imxrt_lpi2c_priv_s *priv)
 
   imxrt_lpi2c_tracenew(priv, status);
 
-  /* Continue with either sending or reading data */
+  /* After an error we can get an SDF  */
+
+  if (priv->intstate == INTSTATE_DONE && (status & LPI2C_MSR_SDF) != 0)
+    {
+      imxrt_lpi2c_traceevent(priv, I2CEVENT_STOP, 0);
+      imxrt_lpi2c_putreg(priv, IMXRT_LPI2C_MSR_OFFSET, LPI2C_MSR_SDF);
+    }
 
   /* Check if there is more bytes to send */
 
-  if (((priv->flags & I2C_M_READ) == 0) && (status & LPI2C_MSR_TDF) != 0)
+  else if (((priv->flags & I2C_M_READ) == 0) && (status & LPI2C_MSR_TDF) != 0)
     {
       if (priv->dcnt > 0)
         {