how to send lin break ?

congminzhou — Mon, 15 May 2017 11:35:01 GMT

hi all:

I want to send lin break ,used MC9S12ZVL, my code:

//--------------------------------------------------------------------------------
//
//SCI0 Lin init 总线时钟 24MHZ 配置波特率：19200 KB/S
//-------------------------------------------------------------------------------
void init_SCI0(void)
{
SCI0SR2_AMAP = 0;//
SCI0ACR2_IREN = 0;//红外遥控解码功能禁止

SCI0BD = 1250; // 波特率设置 24000000/1302 = 19201 =19.2K

//SCI0CR1 = 0x00; //SCI0 控制寄存器1配置
SCI0CR1_PT = 0; //奇偶校验位 0 偶校验， 1：奇校验，只有当PE =1，时有效
SCI0CR1_PE = 0; //奇偶校验使能位 0：禁止 1：使能
SCI0CR1_ILT = 0 ; //空闲线类型为，异步模式必须为0
SCI0CR1_WAKE = 0; //唤醒条件位，0：空闲线唤醒， 1：地址线唤醒
SCI0CR1_M = 0; //数据格式选择位 0:8位 1:9位
SCI0CR1_RSRC = 0; // SCI环路模式下的接收源选择位，只有当 LOOPS = 1，时才有效
SCI0CR1_SCISWAI = 0; //等待模式下的停止位 0：使能 1：禁止
SCI0CR1_LOOPS = 0; // 环路和正常模式选择位 0：正常模式

//-----------------------------------------------------------------

// SCI0CR2 = 0x2c; //SCI0 控制寄存器1配置

SCI0CR2_SBK = 0; //
SCI0CR2_RWU = 0; //
SCI0CR2_RE = 1; // 接收器接收使能位 1：使能 0：禁止
SCI0CR2_TE = 1; // 发送器发送使能位 1：使能 0：禁止
SCI0CR2_ILIE = 0; //
SCI0CR2_RIE = 1; //接收满中断使能
SCI0CR2_TCIE = 0; //
SCI0CR2_TIE = 0; // 发送完中断使能 ///ggg

LP0CR_LPE = 1; //LIN 处于普通收发模式
LP0CR_RXONLY = 0; //

RX_FLAGS.byte = 0; //接收标志复位

//---------------------------------------------------------
SCI0SR2_AMAP = 1;//
SCI0ACR1_BKDIE = 1;//2017 02 09 break interrupt enable
SCI0ACR2_BKDFE = 1;//break intrrupt LOGIC enable

SCI0SR2_RXPOL = 0;// edge active for falling
SCI0ACR1_RXEDGIE = 0; //

LP0CR_LPE = 1;//LIN physical init
LP0CR_LPWUE = 1;

}

//---------------------------------------------------------
//
//send break and 0x55
//--------------------------------------------------------
void send_break_hand(void)
{

SCI0SR2_BRK13 = 1; //13 BIT BREAK
SCI0CR2_SBK = 1; //START TO SEND

}

//-----------------------------------------------------------------------
//函数功能：system clock congfig 配置内晶振，使能PLL 得到 25Mhz总线频率
//入口参数：无
//出口参数：无
//----------------------------------------------------------------------
void init_OSC(void)
{
CPMUOSC_OSCE = 0; // 1:外晶体使能 0：片内时钟
__asm (NOP);
__asm (NOP);
CPMUCLKS_PLLSEL =0; //不使能锁相环时钟，等配置好后再使能 rest =1

CPMUREFDIV_REFDIV0=0; //fREF = fIRCIM = 1M, 故 REFFRQ【1:0】 = 00
CPMUREFDIV_REFDIV1=0;

CPMUSYNR_SYNDIV0 = 1; // fvoc = 48M
CPMUSYNR_SYNDIV1 = 1; //由 fvoc = 2*fosc*(SYNDIV + 1) // SYNDIV = 23
CPMUSYNR_SYNDIV2 = 1; //
CPMUSYNR_SYNDIV3 = 0; //
CPMUSYNR_SYNDIV4 = 1; //
//CPMUSYNR_SYNDIV0 = 0; //0 = 0
// 48MHZ < fvco <= 64MHZ VCOFRQ[1:0] = 01
CPMUSYNR_VCOFRQ0 = 1;
CPMUSYNR_VCOFRQ1 = 0;

// CPMUIFLG_LOCK = 1; // if lock = 1

//fPLL = fvoc / (POSTDIV +1) //
//取 POSTDIV = 0 ===> fPLL = fvoc = 48Mhz
// fbusclock = fPLL/2 = 24MHZ
CPMUPOSTDIV_POSTDIV0 = 0;
CPMUPOSTDIV_POSTDIV1 = 0;
CPMUPOSTDIV_POSTDIV2 = 0;
CPMUPOSTDIV_POSTDIV3 = 0;
CPMUPOSTDIV_POSTDIV4 = 0;
__asm (NOP);
__asm (NOP);

while(CPMUIFLG_LOCK==0 ) //等待锁相环稳定
{
;
}
CPMUCLKS_PLLSEL = 1; //使能锁相环

ECLKCTL_NECLK = 0; //disable BUS CLOCK output on the ECLK PIN 0/1 ENABLI/DISABLE
//-----WATCHDOG ENABLE-----
CPMUCOP_CR2 = 1;
CPMUCOP_CR1 = 0;
CPMUCOP_CR0 = 0;

}

void main(void)
{
init_OSC( );

tim0ch0_init( );

init_SCI0( );

init_key( );
init_ad( );
init_pluse_io( );
init_moto( );
EnableInterrupts;
init_ram( );
send_break_hand( );

while(1)
{

}

but LIN BUS allways is hight ,why？

Re: how to send lin break ?

RadekS — Wed, 17 May 2017 06:36:30 GMT

It seems that the content of this thread is the same as at https://community.nxp.com/thread/451237

Have a great day,
Radek

Re: how to send lin break ?

anishchoudhary — Tue, 28 Nov 2017 11:14:51 GMT

Hi,

There is no need to set break length in slave side, if data is send by master with header frame. To set the break in master side set brake length bit in appropriate register.

Regards,

Anish

topic Re: how to send lin break ? in S12 / MagniV Microcontrollers

how to send lin break ?

Re: how to send lin break ?

Re: how to send lin break ?