I tried to use the MSCAN driver from Softec to test my target board.The program works fine on the demo board.
void MSCANInit(unsigned char can_num){ volatile unsigned char *can_pt; can_pt = can_periph[can_num]; // If MSCAN peripheral is not in Initialization Mode, // enables the Inizialization Mode Request if(!(can_pt[CANCTL1]&CANCTL1_INITAK_MASK)){ can_pt[CANCTL0] = CANCTL0_INITRQ_MASK; while(!(can_pt[CANCTL1]&CANCTL1_INITAK_MASK)) ; } // Enables MSCAN peripheral and chooses Oscillator Clock, // Loop Disabled and Normal Operation can_pt[CANCTL1] = 0x80; // Configures SJW = 3Tq and Prescaler = 2 can_pt[CANBTR0] = 0x03; // Configures One Sample, Time Segment 1 = 6Tq and Time Segment 2 = 3Tq // TSEG1 = PROP_SEG + PHASE_SEG1 and TSEG2 = PHASE_SEG2 can_pt[CANBTR1] = 0x3a; // Disables all the Filters can_pt[CANIDMR_1B+0] = 0xFF; can_pt[CANIDMR_1B+1] = 0xFF; can_pt[CANIDMR_1B+2] = 0xFF; can_pt[CANIDMR_1B+3] = 0xFF; can_pt[CANIDMR_2B+0] = 0xFF; can_pt[CANIDMR_2B+1] = 0xFF; can_pt[CANIDMR_2B+2] = 0xFF; can_pt[CANIDMR_2B+3] = 0xFF; // Restarts MSCAN peripheral and waits for Initialization Mode exit can_pt[CANCTL0] = 0x00; while(can_pt[CANCTL1]&CANCTL1_INITAK_MASK) ; // Waits for MSCAN synchronization with the CAN bus while(!(can_pt[CANCTL0]&CANCTL0_SYNCH_MASK)) ; }
But in my target board, the program cannot go through that while loop :
// Waits for MSCAN synchronization with the CAN bus while(!(can_pt[CANCTL0]&CANCTL0_SYNCH_MASK))
I'm using TJA1041 on my target board instead of TJA1054 on the demo board.
I've prob the pin and I get 2.35v on both CANH and CANL which seems normal to me. I read 121.75 ohm between the two line.
I don't have any clue of what's going on. I tried to connect the board to a CAN bus using CAN King and sending random frame but nothing happen.
