S12 / MagniV Microcontrollersのトピック1

1

kaimi — Mon, 30 May 2022 15:30:35 GMT

lin总线以 9600 波特率的速率发送周期50ms. 同时用pmf的 outc 模式控制gdu 每87us（用定时器T0定时产生中断）极性翻转一次，极性翻转是在定时器T0定中断中完成并且lin发送50ms 定时也由定时器T0在中断中计数50ms发送lin.
现在出现的问题是当lin总线发出时影响gdu 输出波形，图形上看是使gdu的每87us 延时程lin的发送总周期。直到lin 发送完成后也持续影响lin总周期的时间。如何做到互不相应
void TI1_OnInterrupt(void)
{

EnterCritical();
PMFCFG2_MSK = 0X35;
_PMFOUTC_OUTCTL = 0X0A;
_PMFCFG1.Bits.BOTNEGA = ~_PMFCFG1.Bits.BOTNEGA;
_PMFCFG1.Bits.BOTNEGB = ~_PMFCFG1.Bits.BOTNEGB;
ExitCritical() ;

if (bia == 500)
{bia =0;
dataa[0] = 0x1a;
dataa[1] = 0x2a;
dataa[2] = 0x3a;
dataa[3] = 0x4a;
dataa[4] = 0x5a;
dataa[5] = 0x6a;
dataa[6] = 0x1a;
dataa[7] = 0x2a;
EnterCritical();
LIN_send_data(0x33, 8, &dataa[7]);
ExitCritical() ;
}

}
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Re: 1

danielmartynek — Fri, 03 Jun 2022 10:55:17 GMT

Hello @kaimi,

Does it mean that becasue of the LIN operation, the GDU polarity reverse is delayed?
If so, it looks like the issue is in the CPU load when servising the LIN communication.
How long it takes to complete the LIN_send_data(0x33, 8, &dataa[7])?
It looks like this is a blocking function.

BR, Daniel

Re: 1

joany38 — Mon, 06 Jun 2022 15:55:22 GMT

I have a little project that demonstrates how to make a segment in a linker file as well as how to add some data to the segment.

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