This was my first attempt.. It works in simulation for the 'dummy' data (one row of above table) - it assumes that the checksum condition is met to end the input... Output is a table of PIDs (PID[]) and a table of the data values for each PID (PID_Data[]) It assumes that PIDs of 0..127 have one byte...

We need to look at a 'slightly smarter' read - need a way to check the length of each data block and also when the end of the current data is received. This is the checksum byte - but how to know that this is the end of the data and not another PID? So it looks like PIDs are in a range of values (wi...

The length of the data blocks seems to vary - for example there are several starting 128, 84 with differing lengths..
Iain, kindly gave a link earlier - it looks like it is not as simple as waiting for 128 then reading a fixed number of bytes..

I think the checksum calculation is incorrect. If this fails then the display won't update. Need to sum all the bytes of the message (including the checksum byte) - it would be easier to use a loop here! - then take the 2s complement MOD 256 Final value compare to checksum byte... Don't have access ...

You need to use the escape character '\'

So your string will be .str = "AT+CUSD=1,\"100#\",15"

Martin

Autocorrect on my phone..

I read it as not(!) equal - nice that either works...

True - but I've not had any issues so far. Also use if(.x) rather than if(.x !=0 ) - would be interesting to know if it actually saves any memory / or time. Must do a test...

It could come back to bite me someday

Martin

One trick I use a lot - allows an imitation of the ternary operator in a lot of cases.

Boolean operations return 1 for true and 0 for false.

So use:

.v1 = (.v2 < 20) + 2. // 3 if v2 is < 20 else 2

.flag = (.v == 10) // flag true if v = 10

Martin

Is that 'in tractor' or only on the bench?

If it's in situ - how long are the leads to the Nextion display? Interfence might be affecting that?

Odd, how about waiting until the value changes from 128 - it sounds as though only the start byte is being received correctly. Can you just display (or send to uart) all the data received?