Bolymin BETA903A, User Manual, Page: 90 / 95

BETA903A USER MANUAL - 90 -
4.6.
4.6.1.
GPIO And Keypad Control
How to control GPIO of BETA903A
Bolymin provides a DLL file “ pGPIO_903A.dll ” to control the General Purpose Input and
Ouput(GPIO) signal. User could read current value of all GPIO of BETA903A and change values
of GP output signal by functions in “
pGPIO_903A.dll ”.
User could use GPIO control functions by following procedures:
STEP 1. Add “pGPIO_903A.h” into project.
STEP 2. Load “ pGPIO_903A.dll ” by “ Loadlibrary ()” function.
STEP 3. Get the address of control functions by “ GetProcAddress ()” function.
STEP 4. Execute GPIO control functions by the address got at STEP3.
Here is a simple example code to use the GPIO control functions:
// variable declaration
HINSTANCE m_hModule;
BOOL (*m_pGetGPInput)(int);
void (*m_pSetGPOutput)(int, BOOL);
m_hModule=::LoadLibrary(_T("pGPIO_903A.dll"));
m_pGetGPInput = (BOOL (*)(int))::GetProcAddress(m_hModule,_T("GetGPInput"));
m_pSetGPOutput = (void (*)(int, BOOL))::GetProcAddress(m_hModule,_T("SetGPOutput"));
m_bPOUT1 = m_pGetGPInput(GO_POUT1);
m_pSetGPOutput(GO_BLIGHT_ENABLE, TRUE);
Load “
pGPIO_903A.dll
” and get the
address of GPIO control functions.
Execute GPIO control functions.