How to Set TJA1145 CAN active mode

[edt102983]

I'm using S32K144 SPI to port the TJA1145 CAN transceiver, but I cannot set TJA1145 to normal mode and active CAN, the CANH and CANL have no 2.5v; the SPI data and clock are sending completely with measurement, following is my code on S32DS:

====================================

#define TIMEOUT 1000UL
#define BUFFER_SIZE 2

int init_master;
int frame_sent=2;
int ret_1;
int ret_2;
int ret_3;
int ret_4;

uint8_t master_send_1[BUFFER_SIZE]={0x01,0x07}; //set Normal Mode from TJA1145 datasheet
uint8_t master_send_2[BUFFER_SIZE]={0x20,0x7A}; //set CAN active from TJA1145 datasheet
uint8_t master_send_3[BUFFER_SIZE]={0x03}; //read Mode status
uint8_t master_send_4[BUFFER_SIZE]={0x22}; //read CAN status
uint8_t master_receive_1[2];
uint8_t master_receive_2[2];
uint8_t master_receive_3[2];
uint8_t master_receive_4[2];

int spi_init(void)
{

CLOCK_SYS_Init(g_clockManConfigsArr, CLOCK_MANAGER_CONFIG_CNT, g_clockManCallbacksArr, CLOCK_MANAGER_CALLBACK_CNT);
CLOCK_SYS_UpdateConfiguration(0U, CLOCK_MANAGER_POLICY_AGREEMENT);

init_master=SPI_MasterInit(&spi_pal_1_Instance, &LPSPI_0_MasterInitConfig0);
printf("MasterInit_lspi=%d////",init_master);

ret_1=SPI_MasterTransfer(&spi_pal_1_Instance, master_send_1, master_receive_1, frame_sent);
printf("MasterTransfer_ModeSet=%d////rtn=0x%x\n",ret_1,master_receive_1[0]);

ret_2=SPI_MasterTransfer(&spi_pal_1_Instance, master_send_2, master_receive_2, frame_sent);
printf("MasterTransfer_CANSet=%d////rtn=0x%x\n",ret_2,master_receive_2[0]);

return 0;
}

int spi_main(void)  ////my platform is repeating the main.
{

ret_3=SPI_MasterTransfer(&spi_pal_1_Instance, master_send_3, master_receive_3, frame_sent);
printf("MasterTransfer_MainStatus=%d////Status=%x////",ret_3,master_receive_3[1]);

ret_4=SPI_MasterTransfer(&spi_pal_1_Instance, master_send_4, master_receive_4, frame_sent);
printf("MasterTransfer_CANStatus=%d////Status=%x////",ret_4,master_receive_4[1]);

return 0;
}

log==>

initializing and command are completed, but the status is always 0, CANH/CANL no 2.5v.

does the procedure I make is wrong? thanks!! 

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[PetrS]

Hi,

try to use transfer blocking function SPI_MasterTransferBlocking().
Or if using non-blocking one then check if present transfer is finished before new can happen; using SPI_GetStatus()

BR, Petr

[edt102983]

Thanks for the advice; otherwise, do I have to do SPI_SlaveInit() for TJA1145? or just sending the SPI data in one hop.

[PetrS]

Hi,

no you need not it. SPI_SlaveInit() is called if MCU's SPI peripheral is going to be used as slave. This is not a case if communicate with TJA1145, which works as SPI slave and MCU is SPI master.

BR, Petr