One question about FlexRay tx null-frame

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One question about FlexRay tx null-frame

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tangchao
Contributor I

hi everyone!

    I have successfully implemented the sending and receiving of felxray messages. I want to tx null-frame, but I have not been able to achieve this function. I have read the MC9S12XF512 Reference Manual, and set the CMT register to 0 according to the rules. However, I used the Flexray bus monitoring tool to observe the frame type and found that it is still a data-frame, not a null-frame. I want to ask how to modify a static frame single cache message to null frame?

    If there is a code example to send flexray null frame messages using MC9S12XF, I would be extremely grateful.

   following is the code I modified:

void Fr_clear_MB_interrupt_flag(uint8 Fr_buffer_idx)
{
    volatile uint16 temp_value_1 = 0;           // Temporary variable used for bit operation
    volatile uint16 Fr_MB_registers_offset_add_temp; // Temporary offset adress of message buffer registers
 
    // Temporary offset address of MB registers
    Fr_MB_registers_offset_add_temp = Fr_buffer_idx * 4;
 
    // Clear Transmit Buffer Interrupt Flag    
    // Read MBCCSRn and select only necessary bits
    temp_value_1 = (Fr_CC_reg_ptr[FrMBCCSR0 + Fr_MB_registers_offset_add_temp] & 0xF900);
    temp_value_1 |= FrMBCCSR_MBIF;          // Set MBIF flag - clear TX MB interrupt flag 
 
    /* change MBCCSRn.CMT to 0 */
temp_value_1 &= (~FrMBCCSR_CMT);
    
    Fr_CC_reg_ptr[FrMBCCSR0 + Fr_MB_registers_offset_add_temp] = temp_value_1;  // Clear Transmit Buffer Interrupt Flag
}

 

 

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