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?
