topic Re: Issue in the communication between two MCAN modules in LPC Microcontrollers

Issue in the communication between two MCAN modules

fabio_malatesta — Wed, 25 Jul 2018 12:34:52 GMT

I am using the OM13094 (LPCXpresso54618 CAN-FD kit), which provides two can modules CAN1 and CAN0.
I also use the provided SDK.

I try to send a frame from CAN0 to CAN1. The frame is correctly received but CAN1 stores the frame in the wrong memory section (at MSG_RAM_BASE0+RX_FIFO1_OFS). In particular, it stores the frame as if the base address of the Message RAM used for CAN1 was the one used for CAN0.

I attach here an excerpt of the code:

#define MSG_RAM_BASE0 0x20010000U //Base address of the Message Ram for CAN0
#define TX_BUFFER_OFS 0x00U
#define RX_FIFO1_OFS 0x20U
#define MSG_RAM_BASE1 0x20010050U //Base address of the Message Ram for CAN1

//Set Base Addresses

MCAN_SetMsgRAMBase(CAN0, MSG_RAM_BASE0);
MCAN_SetMsgRAMBase(CAN1, MSG_RAM_BASE1);

/* RX fifo1 config for CAN1*/
rxFifo1.address = RX_FIFO1_OFS;
rxFifo1.elementSize = 1U;
rxFifo1.watermark = 0;
rxFifo1.opmode = kMCAN_FifoBlocking;
rxFifo1.datafieldSize = kMCAN_8ByteDatafield;
MCAN_SetRxFifo0Config(CAN1, &rxFifo1);

/* TX buffer config for CAN0*/
txBuffer.address = TX_BUFFER_OFS;
txBuffer.dedicatedSize = 1U;
txBuffer.fqSize = 0;
txBuffer.datafieldSize = kMCAN_8ByteDatafield;
MCAN_SetTxBufferConfig(CAN0, &txBuffer);

The frame received by CAN1 is stored at address 0x20010020U (MSG_RAM_BASE0 + RX_FIFO1_OFS) instead of at address 0x20010070U (MSG_RAM_BASE1 + RX_FIFO1_OFS).

Can someone provide any help about this?

Re: Issue in the communication between two MCAN modules

kevin_huang — Thu, 26 Jul 2018 02:47:52 GMT

can i ask a question about this kit?

does this kit contain micro usb cable lines?

should i buy usb cable lines?

Re: Issue in the communication between two MCAN modules

soledad — Fri, 27 Jul 2018 16:10:41 GMT

Hi Fabio,

Please check the below thread: Message ram location in CAN controller(s) on LPC54608

Have a great day,
Sol
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Re: Issue in the communication between two MCAN modules

soledad — Fri, 27 Jul 2018 16:34:14 GMT

Hi Kevin,

This kit doesn't contain USB cables.