hello community
I am not able to solve the lin communication problem.
Please help me..
First, to use LIN communication, LPUART1, which is S32k116_48QFN PTC8 RX / PTC9 TX, was used.
Second, I used the MLX80020 made by Melexis as the LIN transceiver.
The LIN transceiver is pulled up. The circuit is in the attached figure.(simple circuit.png)
Third, I will simply read the fixed temperature value set in the motor driver (MLX81325) through LIN communication.
And I used the basic example lin_master_s32k116.
Then, the LDF file was loaded and entered into the Lin_Stack component inspector.
And the program works as follows. (Check the attached code, sample code.png)
1. wake up
2. Start normal schedule
3. Check flag -> clear flag -> read or write frame
4. Repeat (After checking the lin communication status, move once again in sleep mode)
But the communication does not work by this code.
The signal of PTC9 connected to LIN TX in s32k116 was checked through the oscilloscope. It produces no signal.
As a result, no signal is generated in the LIN BUS of the LIN transceiver.
Why is there no signal output from LPUART TX? Is there something wrong with the code I presented?
According to Figure 7. Master node state machine of AN12788.pdf,
To become LIN_TX_COMPLETED or LIN_RX_COMPLETED, the following flow is required.
1. IDLE
2. SEND_BREAK_FIELD
3. SEND_PID
4. PID_OK
5. LIN_NODE_STATE_RECV_DATA
6. LIN_NODE_STATE_RECV_DATA_COMPLTED
7. LIN_RX_COMPLETED
In the example code I uploaded, only 1, 2, and 5 occur.
And, 6 and 7 cannot be seen.
Is this also because data is not output from TX?
Regards
skb
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