Hello,
at first excuse my bad english, it´s not my native language :-).
I want to control a PIC18F4550 microcontroller with CVI. I want be able to switch 8 digital outputs an read 8 digital inputs. I own the sourcecode of the microcontroller an know witch messages I have to use to handle my device.
First I created a driver *.inf-file via NI Visa. This file works fine and my device is recognized in MAX.
The next step was programming the LabWindows program.
With the use of various functions in CVI, I am able to switch all my digital outputs.
Here is the code for swiching my outputs (just for example):
viOpenDefaultRM (&SessionUSB);
viFindRsrc (SessionUSB, "?*RAW", VI_NULL, VI_NULL, USBdevice);
viOpen (SessionUSB, &USBdevice[0], VI_NULL, VI_NULL,
&instr);
viSetBuf (instr, VI_WRITE_BUF, 64);
GetCtrlVal (panelHandle, PANEL_RD7LED10, &valueRD7);
#define UPDATE_LED 0x32
sendbuf[0] = UPDATE_LED; // diese Befehle muss der PIC
sendbuf[1] = 10; // erhalten um die gewünschten
sendbuf[2] = valueRD7; // Ausgänge zu schalten
viBufWrite (instr, sendbuf, 64, VI_NULL);
viClose (SessionUSB);
But reading the inputs doesn´t work. I get this error message:
sendbuf is a 64 bit array containing the messages the PIC needs to receive.
In receivebuf
