write operation

[fupe]

HI,
Are you planing to add write operation to your teplate?
I found some extension for you.
LBP_PDD_DATA_TYPE_STREAM = 0x06,
LBP_PDD_DATA_TYPE_BOOLEAN = 0x07,
new
LBP_PDD_DATA_TYPE_ENCODER 0x08
LBP_PDD_DATA_TYPE_FLOAT 0x10 // New for STMBL
LBP_PDD_DATA_TYPE_ENCODER_H 0x18
LBP_PDD_DATA_TYPE_ENCODER_L 0x28

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I try change NonVolatile variables on my card by this sequence
halrun
loadrt hostmot2
loadrt hm2_eth board_ip="192.168.1.121"
loadrt setsserial cmd="set hm2_eth.xxx.xxx.xx.cust.0.NVBaudRate 5"

this command call write function 0x65 and
LBP_COMMAND_LOCAL_WRITE_NVMEM_FLAG = 0xEC, // 0x01 nvacces 0x00normal acces

I add to your code and now it is functional.

---

I have 7i92 and 7i76E and try get some information from sserial card connect to it.
mesaflash --card 7i92 --sserial --verbose
This command tels you all about card, address, name, param a mem locatin etc.
but at the and of report mesaflash want to know what is on addres 0x00 and 0x01. I dont know why.
This request scan all memory on card. I send back 0x00 and 0x00 and report finished without scan all memory.
If you want I can send you my experimental code extended for write, answer for LBP_COMMAND_LOCAL_WRITE_NVMEM_FLAG, add param address 0x4000, etc. for stm32f103

I made some more changes, for example select gtoc (list of variables) based on sw mode and hw mode. etc

And finaly I have ones more question.
Are you planning controll process sserial throught interrupts? I think it is better than in loop.
I am planning make code for panel (led, keys, encoder for spindle speed etc), this code consumes many time and the program may not be fast enough in loop.
My first experiment was on keil studio and there is no problem make it with interrupts.
thanks
Martin (fupe on linuxcnc)

[fdarling]

Hello Martin,

1. I can add those data LBP_PDD_DATA_TYPE_xxx enumerations you've mentioned, I see them mentioned in LinuxCNC's sourcecode:
   https://github.com/LinuxCNC/linuxcnc/blob/4f1861ae365241866aa394d125a88954eae77dc9/src/hal/drivers/mesa-hostmot2/sserial.h#L82
2. I am unfamiliar with the non-volatile write features, could you explain it a bit more? Do you have any links to documentation on it? I looked at setsserial.c in LinuxCNC, but it was confusing without more context:
   https://github.com/LinuxCNC/linuxcnc/blob/4f1861ae365241866aa394d125a88954eae77dc9/src/hal/drivers/mesa-hostmot2/setsserial.c
3. I'm not sure what mesaflash is trying to access on the SmartSerial device, but I can ask Peter Wallace (pcw on the forums) of Mesa Electronics, he'd know!
4. Yes, I'd love to see your working code. Would you please post it on GitHub and link me to it?
5. This template was a proof of concept, and has many problems (not just a lack of interrupts usage). I need to refactor it to eliminate duplicate code, and make it easier to implement different commands.

To continue with the idea of refactoring, once that was done, a decision must be made about how the SmartSerial device maintains real-time responsiveness. It could always have it's functions enact immediately on volatile variables from inside an interrupt (effectively an unpredictable background thread), which means the user code would have to take care to synchronize with the volatile state.

Another option (which is the current implementation) is to handle it in the main loop or "user code" where it's the the programmer's responsibility to not delay too much in responding to the requests. Doing it in user code can be made more elegant by using something like protothreads (a fiber style co-operative multitasking technique) to effectively allow multiple pieces of code to run in parallel. This would allow for slow running things (LCD framebuffer updating for instance) to be run in "parallel" with the SmartSerial code, but without the context switching overhead of true threads.

I am definitely open to discussing this!

[fupe]

hi, unfortunately I did not find too much information. most of the information is obtained by experiments and reverse engineering of hostmot and stmbl programs.
I create git https://github.com/fupe/sserial-template
Martin