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xiaoxiang781216 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 c929cc6eb7a drivers/can/ctucanfd: Read RX frames on RBNEI in the
character driver.
c929cc6eb7a is described below
commit c929cc6eb7ae81368725e98a52ff2c6ffa061fef
Author: raiden00pl <[email protected]>
AuthorDate: Tue Oct 13 19:50:20 2026 +0200
drivers/can/ctucanfd: Read RX frames on RBNEI in the character driver.
The character driver enables only RBNEI for RX but read the RX buffer
only on RXI. A frame whose RXI was already cleared kept RBNEI set, so
the interrupt fired again and again without the frame being read and
the node stopped responding until the next frame arrived. Read on RXI
or RBNEI.
CTU CAN FD datasheet, INT_STAT: "RBNEI RX buffer not empty interrupt.
Clearing this interrupt and not reading out content of RX Buffer via
RX_DATA will re-activate the interrupt."
https://canbus.pages.fel.cvut.cz/ctucanfd_ip_core/doc/Datasheet.pdf
Assisted-by: Claude:claude-opus-5-5
Signed-off-by: raiden00pl <[email protected]>
---
drivers/can/ctucanfd_pci.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/can/ctucanfd_pci.c b/drivers/can/ctucanfd_pci.c
index 9c2cf4b7e58..ea214a8aea8 100644
--- a/drivers/can/ctucanfd_pci.c
+++ b/drivers/can/ctucanfd_pci.c
@@ -952,9 +952,11 @@ static void ctucanfd_chardev_interrupt(FAR struct
ctucanfd_driver_s *priv)
continue;
}
- /* Frame received */
+ /* Frame received. RBNEI stays set while the RX buffer is not empty,
+ * RXI may be already cleared for frames still in the buffer.
+ */
- if (stat & CTUCANFD_INT_RXI)
+ if (stat & (CTUCANFD_INT_RXI | CTUCANFD_INT_RBNEI))
{
ctucanfd_chardev_receive(&priv->devs[i]);
}
