S32KのトピックHow to Set TJA1145 CAN active mode

How to Set TJA1145 CAN active mode

edt102983 — Fri, 07 May 2021 09:50:50 GMT

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!!

Re: How to Set TJA1145 CAN active mode

PetrS — Fri, 07 May 2021 11:39:37 GMT

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

Re: How to Set TJA1145 CAN active mode

edt102983 — Mon, 10 May 2021 02:26:32 GMT

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

Re: How to Set TJA1145 CAN active mode

whotplace — Mon, 10 May 2021 03:29:40 GMT

finding the right skills to your startup might be easier with those proven hiring guidelines.
learn how to attract and maintain gifted human beings. read an interview with exgoogler david
bizer. highlights: we're a group of startup fans, we've a 、global reach

voip phone

Re: How to Set TJA1145 CAN active mode

PetrS — Tue, 11 May 2021 06:24:40 GMT

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