增加modbus功能，待测试

zhyinch

2022-01-23 bcd3024235d04c926f8a915500927232435137a7

 源码/核心板/Src/algorithm/TrackingDiff.c

@@ -33,7 +33,7 @@
void NewTrackingDiffUpdate(u8 channel, float target)
{
   float error;
   if(g_Tagdist[channel]==0xffff)
   if(g_Tagdist[channel]==0x1ffff)
   {
   pos_predict[channel]=target;
   }