LPC1788: Is there any way to read all packets on CAN bus without filtering them?

[hhhosi]

I have been working on LPC1788's CAN bus. I have no problem, using it in normal mode where I provide an ID and can read the received packets.

I wanted to read all packets on the CAN bus and it seems I have to use "bypass mode" to achieve this. Unfortunately, when I enter bypass mode, I cannot read any data from the CAN bus. I've tried both interrupt and polling modes.

This is the relevant section of the code:

PINSEL_ConfigPin (0, 0, 1);
 
  PINSEL_ConfigPin (0, 1, 1);
 
  //Initialize CAN1
  CAN_Init(CAN_1, 500000);  
 
  if(normal_mode) //filter mode
  {
   //Enable Receive Interrupt
   CAN_SetAFMode(CAN_NORMAL); //normal filtering mode
   CAN_IRQCmd(CAN_1, CANINT_RIE, ENABLE); //receive enable
   CAN_IRQCmd(CAN_1, CANINT_FCE, ENABLE); //full interrupt enable
   CAN_IRQCmd(CAN_1, CANINT_IDIE, DISABLE); //ID ready interrupt disable (only used for bypassmode)
  }
  else //bypass mode
  {
   CAN_SetAFMode(CAN_ACC_BP); //bypass mode get everything
   CAN_IRQCmd(CAN_1, CANINT_RIE, ENABLE); //receive enable
   CAN_IRQCmd(CAN_1, CANINT_FCE, ENABLE); //full interrupt enable
   CAN_IRQCmd(CAN_1, CANINT_IDIE, ENABLE); //ID ready interrupt enable
  }

Any help will be much appreciated.

[jeremyzhou · Accepted solution]

Hi hh hosi,

Thank you for your interest in NXP Semiconductor products and 

the opportunity to serve you.

To provide the fastest possible support, Please refer to CAN_Bypass demo in the following library to view the details.

LPC177x and LPC178x CMSIS-Compliant Standard Peripheral Firmware Driver Library (Keil, IAR) | www.LP...

Have a great day,

TIC

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[hhhosi]

Thank you that made it work.