FIFO 1 CAN Interrupts not working

[nbutts]

Posted on September 09, 2005 at 09:27

FIFO 1 CAN Interrupts not working

[nbutts]

Posted on May 17, 2011 at 11:37

I am having trouble getting CAN interrupts to work with the ST9. I was able to get CAN Tx interrupts and CAN Rx interrupts for FIFO 0 working. But I can't get interrupts working for FIFO 1.

Here is a snippet from my init code:

/* Enable interrupts. */

spp(CAN0_CTRL_PG);

CAN_CIER = CIER_tmeie | CIER_fmpie0 | CIER_fmpie1;

spp(SINT_PG);

SIMRL |= (SIm_imf0m | SIm_ime0m | SIm_ime1m);

SITRL |= (SIm_itef0m | SIm_itee0m | SIm_itee1m);

In CrtBegin.spp I have the following vectors defined:

.org 0xA0

.word ServicePolledCAN ;CAN Rx interrupts

.word ServicePolledCAN ;CAN Rx interrupts

.word SendTxQueues ;CAN Tx interrupts

The SIVR register is set to 0xBE. I am using the emulator and have break points set on both the ServicePolledCAN and SendTxQueues. Everytime the ST9 tries to transmit I get an interrupt and the code breaks on SendTxQueues. When I send data to FIFO 0 the emulator breaks on ServicePolledCAN. But when I send a CAN packet that goes to FIFO 1 the SIPRL register gets set to 0x02 but never generates an interrupt to vector 0xA2.

Any ideas?

[siegmund]

Posted on May 17, 2011 at 11:37

hi

be sure when using interrupts, that your core has the same clock-speed as the peripherals.

see acutal datasheet v4, there are some hints about bugs in the st9 (especially the interrupts) and some workarounds.

siggi