topic Re: How to send data using Local Interconnect Network(LIN)? in 8-bit Microcontrollers

How to send data using Local Interconnect Network(LIN)?

mehdializadeh — Tue, 20 Dec 2022 13:12:35 GMT

Hi,
I use mc9s08dz96.To send data in the form of the LIN protocol, I have set the CodeWarrior settings to asynchronous mode. According to the frame LIN protocol, I have defined and sent the data.

This is my data:

byte break_1={0x00}; byte break_2={0x00}; byte Sync_={0x55}; byte ID_={0x11}; byte data1={0x80}; byte data2={0x29}; byte chsum={0x56};

Then in main I sent these data:

AS1_Init(); Enable_Lin = 1; while(1){ c=AS1_SendChar(break_1); c=AS1_SendChar(break_2); c=AS1_SendChar(Sync_); c=AS1_SendChar(ID_); c=AS1_SendChar(data1); c=AS1_SendChar(data2); c=AS1_SendChar(chsum); delayy(5000); }

Data sending function is:

byte AS1_SendChar(AS1_TComData Chr) { if (!EnMode) { /* Is the device disabled in the actual speed CPU mode? */ return ERR_SPEED; /* If yes then error */ } if (SCI1S1_TDRE == 0U) { /* Is the transmitter full? */ return ERR_TXFULL; /* If yes then error */ } SCI1D = (byte)Chr; /* Store char to the transmitter register */ return ERR_OK; /* OK */ }

Now, 010 is added between each byte of data that I send with the above codes, which causes the receiving device to misread the data. What do you suggest to remove this 010?
The file is attached.
Best regards

Re: How to send data using Local Interconnect Network(LIN)?

vicentegomez — Wed, 21 Dec 2022 00:26:51 GMT

PLease check the LIN stack

LIN2.x and SAE J2602 Stack

Also check the application note

https://www.nxp.com/docs/en/application-note/AN3756.pdf

Re: How to send data using Local Interconnect Network(LIN)?

mehdializadeh — Sat, 24 Dec 2022 14:24:24 GMT

Thank you so much for your kind reply.
I think that my problem is the synchronizing the S08’s Internal Clock for LIN or registers. But I set these.
This is my init function:

void AS1_Init(void) { /* SCI1C1: LOOPS=1,SCISWAI=0,Rsrc=1,M=0,WAKE=1,ILT=1,PE=0,PT=0 */ setReg8(SCI1C1, 0xACU); /* Configure the SCI */ /* SCI1C3: R8=0,T8=0,TXDIR=1,TXINV=0,ORIE=0,NEIE=0,FEIE=0,PEIE=0 */ setReg8(SCI1C3, 0x20U); /* Disable error interrupts */ /* SCI1C2: TIE=0,TCIE=0,RIE=0,ILIE=0,TE=0,RE=0,RWU=0,SBK=0 */ setReg8(SCI1C2, 0x00U); /* Disable all interrupts */ /* SCI1S2: LBKDIF=0,RXEDGIF=0,??=0,RXINV=0,RWUID=0,BRK13=1,LBKDE=0,RAF=0 */ setReg8(SCI1S2, 0x04U); AS1_SetHigh(); /* Initial speed CPU mode is high */ }

and I have this function:

static void HWEnDi(void) { if (EnMode) { /* Enable device? */ SCI1BDH = 0x00U; /* Set high divisor register (enable device) */ SCI1BDL = 0x1AU; /* Set low divisor register (enable device) */ SCI1C2_TE = 0x01U; /* Enable transmitter */ SCI1C2_RE = 0x01U; /* Enable receiver */ } else { SCI1C2_RE = 0x00U; /* Disable receiver */ SCI1C2_TE = 0x00U; /* Disable transmitter */ SCI1BDH = 0x00U; /* Set high divisor register to zero (disable device) */ SCI1BDL = 0x00U; /* Set low divisor register to zero (disable device) */ } }

Is it possible for you to view the file I have attached? I really appreciate it.