Quad decoder

[Anonymous]

I am trying to use the quad decoder as a simple up/down counter.  I have a question on how the triggercommand should be configered.

   

I have tried the example and it works. I do have a encoder hooked up and have verified the both signals A & B are correct as in phase, amplitude, etc. 

   

I am not using the interrupt but trying to read the counter with QuadDec_ReadCounter();.  But it is not changing.

   

I have set the decoder as below.

   

QuadDec_Stop();

   

QuadDec_Init();

   

QuadDec_SetMode(QuadDec_MODE_QUAD);

   

QuadDec_SetQDMode(QuadDec_MODE_X4);

   

QuadDec_SetOneShot(0);

   

QuadDec_SetCounterMode(QuadDec_COUNT_UPDOWN0);

   

QuadDec_TriggerCommand(QuadDec_MASK, QuadDec_CMD_CAPTURE);

   

//Read count

   

EncoderCount = QuadDec_ReadCounter();

   

printf("Encoder Couunter = %lu\r\n",EncoderCount);

   

Thanks

   

Mark

[Bob_Marlowe]

Welcome in the forum, Mark!

       

QuadDec_Stop(); // Do not use here, device is not started yet

   

QuadDec_Init();

   

QuadDec_SetMode(QuadDec_MODE_QUAD);

   

QuadDec_SetQDMode(QuadDec_MODE_X4);

   

QuadDec_SetOneShot(0); // NOT FOR QD

   

QuadDec_SetCounterMode(QuadDec_COUNT_UPDOWN0); // NOT FOR QD

   

QuadDec_TriggerCommand(QuadDec_MASK, QuadDec_CMD_CAPTURE); // Not of use here

   

QuadDec_Start(); // is needed here!!!

       

You can set all those by using the configuration dialog, can be easier.

       

Happy coding

   

Bob

[Anonymous]

Bob,

   

     The configuration for the TCPWM module is configured for Quadrature Decoder,    1X  phiA and phiB selected and set to level  ,   Built-in set to default 2, 0 false, false.

   

Does this put the decoder in continues mode, counting up/down and do I need to use any of the API to further configure the quad?

   

Or all I do is start it with QUAD_Start();

   

Do I use QUAD_ReadCounter(); to the counts?

       

Thanks

   

Mark 

[Bob_Marlowe · Accepted solution]

When configuring the QD (as most other components) there is no need to specify more settings to setup the device. Just call the _Start() API to let the component work. Datasheet states that _ReadCounter() is the method to get the actual position.

       

Bob