Hello everyone!
For the few last days I tried to get working FlexCAN via MQX IO api. Now it looks like i am totally failed. I use custom board with MK20DX256VLK7 CPU and MQX 4.0.1. The problem is, that no data ever leaves mailboxes, it spams errors infinitely instead: CAN0_ECR is changing, code in CAN0_CS0 is stuck on 0xc, no timestamp in CAN0_CS0. The code is simple:
#define CAN_DEVICE ( 0 )
#define FREQUENCY ( 1000 )
#define MAILBOX_TX ( 0 )
void canbus_task(uint_32 initial_data)
{
_bsp_flexcan_io_init(CAN_DEVICE);
FLEXCAN_Initialize(CAN_DEVICE, 0, 0, FREQUENCY, FLEXCAN_IPBUS_CLK);
FLEXCAN_Initialize_mailbox(CAN_DEVICE, MAILBOX_TX, 0x111, 8, FLEXCAN_TX, FLEXCAN_STANDARD, FLEXCAN_DISABLE);
FLEXCAN_Activate_mailbox(CAN_DEVICE, MAILBOX_TX, FLEXCAN_TX_MSG_BUFFER_NOT_ACTIVE);
FLEXCAN_Select_mode(CAN_DEVICE, FLEXCAN_NORMAL_MODE);
unsigned char data[] = { 0x23, 0x10, 0x19, 0x67, 0x11, 0x22, 0x33, 0x44 };
FLEXCAN_Tx_mailbox(CAN_DEVICE, MAILBOX_TX, data);
_task_block();
}
Can some one verify that this is the correct code? The hardware is functional, on the other end i have PCAN-USB. It works for sure, because i was able to receive messages from this board without the use of MQX (another project). The situation is really weird because i even tried to manually configure CAN0 module in exact the same way as in barebone project. I verified that all the registers are totally equal (except CAN0_TIMER of course). But sending data fails anyway. I feel that i miss some obvious tiny detail, but this is my first experience with canbus, and i am out of ideas.
Please help me, dear community :)
