Forum TI-Planet.org

I probably misunderstood something, I'm trying to connect the nspire with some USB device using this code

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      nn_ch_t ch = NULL;
      nn_oh_t oh = NULL;
      nn_nh_t nh = NULL;
      oh = TI_NN_CreateOperationHandle();
      int ans=TI_NN_NodeEnumInit(oh);
      if (ans>=0){
   ans=TI_NN_NodeEnumNext(oh, &nh);
   if (ans>=0){
     TI_NN_NodeEnumDone(oh);
     TI_NN_DestroyOperationHandle(oh);
     ans=TI_NN_Connect(nh, 0x8001, &ch);
     if (ans>=0){
...


but the line int ans=TI_NN_NodeEnumInit(oh); fails to compile, while int ans=TI_NN_NodeEnumInit(ch); compiles.

The declaration of TI_NN_NodeEnumInit does not use the same argument type for the calc and for the device: for the calc it's nn_ch_t

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include/syscall-decls.h:int16_t TI_NN_NodeEnumInit(nn_ch_t p1);
libsyscalls/stubs.cpp:int16_t TI_NN_NodeEnumInit(nn_ch_t p1);


for the PC it's nn_oh_t

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NavNet/include/navnet.h:DLLDECL int16_t TI_NN_NodeEnumInit(nn_oh_t oh);


The PC declaration seems ok with the NavNet doc (https://hackspire.org/index.php?title=Syscalls#The_NavNet_API) while the calc declaration seems wrong:

nn_oh_t TI_NN_CreateOperationHandle(void): create an operation handle to be used with some NavNet functions.
int16_t TI_NN_DestroyOperationHandle(nn_oh_t oh): destroy an operation handle.
int16_t TI_NN_NodeEnumInit(nn_oh_t oh): initiates a node (computer or device) enumeration. Enumeration is required to find the partner computer or device.
...

I tried to figure out USB a while ago but kept getting stuck and confused. Can you show me your code if you get it working?

I'm not trying anymore. I found another way to detect that the calculator is connected to a computer (I was not really interested in USB communication, just wanted to know if there was a connection).

Well, sounds like a real prototype conflict/issue, can you open an issue here https://github.com/ndless-nspire/Ndless/issues/new and basically copy-paste your post ?

parisse wrote:I'm not trying anymore. I found another way to detect that the calculator is connected to a computer (I was not really interested in USB communication, just wanted to know if there was a connection).

How ?
Which port bit are you checking and for which value ?

Some details were given here: https://github.com/ndless-nspire/Ndless/issues/215 but not how it was found

Updated there.