AN2628 datasheet(11/27 Pages) STMICROELECTRONICS

11 / 27 page

AN2628

Programming through CAN hardware features

11/27

if (status & TxOK)

{......}

// transmit interrupt

if (status & RxOK)

{......}

// receive interrupt

if (status & 0x07)

{......}

// erroneous transfer interrupt

}

if (CANxCR & EIE) // if EIE is set (error interrupts)

{

if (status & EWRN)

{......}

// error counter warning

if (status & BOFF) // bus-off situation

CANxCR = (CANxCR & 0xfe);

// recover from BOff (clear INIT)

{......} // remaining part of the BOff procedure

}

break;

case 1: // Message 1 Interrupt

CANxIF1CM = 0x7F;

// Transfer entire message into inference

CANxIF1CR = intid;

// register and clear IntPnd and NewDat

CANx_WAIT_FOR_IF1;

if (CANxIF1A2 & IF_DIR)

// direction = transmit

{

if (CANxIF1MC & IF_NEWDAT)

// remote received provided that UMask = 1

// and RmtEn = 0

{.....} // procedure to handle answer to remote

else

{.....} // procedure to handle transmit interrupts

}

else

// direction = receive

{

if (CANxIF1MC & IF_NEWDAT) // NewDat is set

{.....}

// procedure to handle data receive interrupt

else

{.....} // a remote frame was successfully transmitted

}

break;

block to be repeated (from ‘case 1:’ to ‘case 32:’)

case n: // Message n Interrupt

CANxIF1CM = 0x7F;

// Transfer entire message into inference

CANxIF1CR = intid;

// register and clear IntPnd and NewDat

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