The drvlib_app.dll contains function to control GPIO's.
GPIO = General Purpose Input Output.

Many pins of the Trizeps-module are GPIO's with multiple functionality; i.e. they may be configured as UART or LCD-interface pins etc.. The most simple function is to use these pins as input or output. If you want to know how to use a pin as interrupt-source see Using Interrupts on Trizeps.

Usage of pins is made easy with the Keith & Koep drvlib_app.dll:

#include "windows.h"
#define  CPLUSPLUS 1
#include "drvlib_app.h"

int WINAPI WinMain( HINSTANCE hInstance,
                    HINSTANCE hPrevInstance,
                    LPTSTR    lpCmdLine,
                    int       nCmdShow)
{
   PGIO_REGS ptr;
   unsigned long arg_l = 0;
   BOOL state;
 
   arg_l=_wtol(lpCmdLine);

   ptr = GPIO_AllocSpace();
    
   state = GPIO_Get_Pin( ptr, (unsigned char)arg_l);
   GPIO_Init_Pin(ptr, (unsigned char)arg_l, TRUE, !state);
   Sleep(3000);
   GPIO_Set_Pin( ptr, (unsigned char) arg_l, state);
   
   GPIO_FreeSpace();
   return 0;
}

This is what the sample does

1. Obtain gpio to use from commandline.
2. GPIO_AllocSpace() is called to map GPIO-registers.
3. GPIO_Get_Pin(..) gets the current pin-state (i.e. low (0V)).
4. GPIO_Init_Pin(..) configured the pin to be an output and toggles the pin-state (i.e. high(3.3V)).
5. Wait 3 seconds.
6. GPIO_Set_Pin(..) sets the pin-state to its original value (i.e. low(0V)).
7. GPIO_FreeSpace() will release ressources allocated with GPIO_AllocSpace().

Embedded Visual C++ Workspace for above example:

• gpio.zip

To ease the use of the CPLD'pins of the Trizeps VI ( see Trizeps6 CPLD), they are assigned to a GPIO-number. This can be used in all GPIO_xxx() functions.