1. MCU sending to Nextion
   1. MCU sends command. ie: wept 30,20ÿÿÿ or addt 1,0,320ÿÿÿ
   2. Nextion requires ~5ms to prepare for transparent mode data transfer
   3. Nextion sends “Ready” 0xFE 0xFF 0xFF 0xFF Return Data (see 7.32)
   4. MCU can now send specified quantity (20) of raw bytes to Nextion
   5. Nextion receives raw bytes from MCU until specified quantity (20) is received
   6. Nextion sends “Finished” 0xFD 0xFF 0xFF 0xFF Return Data (see 7.31)
   7. MCU and Nextion can proceed to next command

Note: Nextion will remain waiting at step 5 until every byte of specified quantity is received.
– During this time Nextion can not execute any other commands, and may indeed hang if the MCU fails to deliver the number of bytes as specified by the command parameter.
– data quantity limited by serial buffer (all commands+terminations + data < 1024)

// these are valid comments
sys0=0// reset sys0 to zero

The following showcases valid/invalid use

//valid comment before condition/iteration
for(sys0=0;sys0<=sys1;sys0++)
// invalid comment between condition/iteration and block
{
  doevents//valid comment after code on same line
  // valid comment inside block
}
// valid comment outside block

if(t0.txt=="123456")
{
  page 1
}

if(t0.txt=="123456"||sys0==14&&n0.val==12)
{
  page 1
}

if(t0.txt=="123456"&&sys0!=14)
{
  page 1
}

if(n0.val==123)
{
  b0.txt="stop"
}else
{
  b0.txt="start"
}

if(rtc==1)
{
  t0.txt="Jan"
}else if(rtc1==2)
{
  t0.txt="Feb"
}else if(rtc1==3)
{
  t0.txt="Mar"
}else
{
  t0.txt="etc"
}

// increment n0.val as lon as n0.val < 100.  result: b0.val=100
// will not visually see n0.val increment, refresh when while-loop completes
while(n0.val<100)
{
  n0.val++
}

//increment n0.val as long as n0.val < 100. result: n0.val=100
// will visually see n0.val increment, refresh each evaluation of while-loop
while(n0.val<100)
{
  n0.val++
  doevents
}

// iterate n0.val by 1's as long as n0.val<100. result: n0.val=100
// will not visually see n0val increment until for-loop completes
for(n0.val=0;n0.val<100;n0.val++)
{
}

////iterate n0.val by 2's as long as n0.val<100. result: n0.val=100
// will visually see n0.val increment when doevents processed
for(n0.val=0;n0.val<100;n0.val+=2)
{
  doevents
}