In Vehicle NetworkingのトピックRe: Have some problem TJA1145 SPI receive data

Have some problem TJA1145 SPI receive data

kimmk — Wed, 26 Mar 2025 02:16:51 GMT

"I am trying to establish CAN communication using the S32K144 MCU and TJA1145. First, I am in the process of configuring the TJA1145 for SPI communication.

To verify that SPI communication is functioning correctly, I attempted to receive the ID value from the TJA1145. I combined the register address 0x7E with the read bit to transmit 0xFD, and the data was 0x00. I expected to receive the value 0x74, which is assigned to the register address.

However, according to the MCU, the same data as MOSI was observed on the MISO pin through the oscilloscope.

C1 : MISO | C2 : MOSI | C3 : CLK | C4 : CS

I am curious about what I might have missed that could have caused this issue.

Re: Have some problem TJA1145 SPI receive data

guoweisun — Wed, 26 Mar 2025 02:24:52 GMT

Hi kimmk

What about read for others registers? still back to wrong data for same issue ?

Re: Have some problem TJA1145 SPI receive data

kimmk — Wed, 26 Mar 2025 04:36:51 GMT

Hello, guoweisun.

Other registers also exhibit the same phenomenon.

The first photo shows the operation of inputting Normal (0x07) into the Mode Control register (0x01) of the TJA1145.

The second photo shows the operation of reading register 0x01 to check if it has been applied correctly.

I am experiencing the same symptoms in all communication operations, and I am unable to determine what I have configured incorrectly.

Re: Have some problem TJA1145 SPI receive data

guoweisun — Thu, 27 Mar 2025 01:43:19 GMT

Should be the SPI configuration issue,I suggest to download the example drive for reference.

TJA1145A | HS CAN Partial Networking Transceiver | NXP Semiconductors

Re: Have some problem TJA1145 SPI receive data

kimmk — Thu, 27 Mar 2025 05:26:47 GMT

I have restricted access to that item

Since drafting an NDA is outside of my authority, it is difficult for me to refer to that material.

Re: Have some problem TJA1145 SPI receive data

guoweisun — Fri, 28 Mar 2025 00:28:26 GMT

That's better for your to sign NDA also you can do on line:

Support | NXP Semiconductors

Because lots of products need customer sign NDA to get support or documentations.