Sending and receiving data PIC18F4550
OK, I have seen some forums on the way to talk with the LabView PIC18F4550 and did not find any solution up there, usually all the subjects this is ended with nothing.
OK, here's what I've done so far:
Part of microcontroller: I have downloaded the example of the Microchip Solutions, compiled the example for PICDEM card, however I have no card PICDEM, so I just set up my own simple Board with minimum elements. I have run this example on my PIC18F4550 and also used the standard Human Interface Device driver, I have run the example application and could turn on/off the LEDs and read potentiometer values. Then, once I saw that the device is working, I uninstalled the driver and unplugged my USB device.
Now: I found the manual on the site of NOR, which explains how to generate the pilot tool of NI-VISA, I went through it, and with generated success driver for my device and then I installed this driver, plugged my USB with PEAK and could see its properties etc.
So far seems ok. Now appears as a last step, I want to read data let the potentiometer through the PEAK.
According to the previous manual, now I use VISA Interactive Control tools, what im going to do now is to send requests to my PIC and get response/data from it.
Take a look at some of the code of the firmware on my PIC:
Sub ProcessIO (void)
{
Blink the LEDS according to the status of the USB device
If (blinkStatusValid)
{
BlinkUSBStatus();
}Tasks user Application USB
< configured_state)||(usbsuspendcontrol="=1))">If (!.) HIDRxHandleBusy (USBOutHandle)) //Check if data received from the host.
{
Switch(ReceivedDataBuffer[0]) //Look the host data sent, to see what kind of application specific command, he sent.
{
0 x 80-case: //Toggle control LED
blinkStatusValid = FALSE; Stop the flashing of the LED automatically, will now control manually.
If (mGetLED_1 () == mGetLED_2())
{
mLED_1_Toggle();
mLED_2_Toggle();
}
on the other
{
If (mGetLED_1 ())
{
mLED_2_On();
}
on the other
{
mLED_2_Off();
}
}
break;
0 x 81-case: //Get State of push button
ToSendDataBuffer [0] = 0x81; Back to the PC host the command echo we assume in the first byte. In this case, the command Get Pushbutton State.
if(SW3 == 1) //pushbutton no hurry, the pull up resistance on the circuit board is pulling on the high PORT pin
{
ToSendDataBuffer [1] = 0x01;
}
else //sw3 should be == 0, push-button is pressed and overwhelming pull upward resistance
{
ToSendDataBuffer [1] = 0x00;
}
If (!.) HIDTxHandleBusy (USBInHandle))
{
USBInHandle = HIDTxPacket (HID_EP,(BYTE*) & ToSendDataBuffer [0], 64);
}
break;0 x 37-case: command /Read. POT Use ADC to measure an analog voltage on one of the pins of I/o ANxx and returns the result to the host
{
WORD_VAL w;If (!.) HIDTxHandleBusy (USBInHandle))
{
mInitPOT();
w = ReadPOT(); ADC lets read the pin I/O voltage. See the relevant HardwareProfile - the stem of I/O that it will measure in the xxxxx.h file.
Some advice from demo, as the Council PIC18F87J50 FS USB plug-in Module, do not have a potentiometer (when used stand-alone).
This function call will always make however the analog voltage on the I/O pin. To make the demonstration more interesting, it
suggests that an external adjustable analog voltage must be applied to this PIN.
ToSendDataBuffer [0] = 0 x 37; Back to host the command echo we assume in the first byte. In this case, the command Read POT (analog voltage).
ToSendDataBuffer [1] = w.v [0]; Measure the analog voltage LSB
ToSendDataBuffer [2] = w.v [1]; Measure the analog voltage MSB
USBInHandle = HIDTxPacket (HID_EP,(BYTE*) & ToSendDataBuffer [0], 64);
}
}
break;
}
Rearm OUT for the next package endpoint
USBOutHandle = HIDRxPacket (HID_EP,(BYTE*) & ReceivedDataBuffer, 64);
}
} //end ProcessIO
As you can see he is ProcessIO function, with the presentation of the main switch, for example case 0 x 37: means if it gets this value from the host, it must send the value of the potentiometer to USB.
Now, what I tried to do is, in the interactive control of VISA, I selected the tab Interface IO and then tried to send the query with the value 0 x 37 in the field of the wValue, the bmRequestType was 0 x 0, and what I get is weird values I don't think that are the actual values of the potentiometer read... (I tried to change the potentiometer then do ask again and got the same values)
I also tried to experiment with basic i/o tab and got the same weird things...
so at this point, what I am doing wrong? what I need to / supposed to do now?
or can u point me to the source of valuable information?
or the LabView guru on this site, tell me please your opinion on this subject?
Tags: NI Hardware
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