How to set GPIO Debounce time with Unified BSP 1.00?

Luan Le

Other Parts Discussed in Thread: TSC2046, OMAP3530

Hi,

In PddInitializeHardware(VOID) of touchscreen.c BSP6.15.00, the following code are for setting the debounce time of PenIRQ pin:

IOCTL_GPIO_SET_DEBOUNCE_TIME_IN debounce;

debounce.gpioId = s_TouchDevice.nPenGPIO;

debounce.debounceTime = 10;

GPIOIoControl(s_TouchDevice.hGPIO, IOCTL_GPIO_SET_DEBOUNCE_TIME, (UCHAR*)&debounce, sizeof(debounce), NULL, 0, NULL, NULL);

In Unified BSP 1.00,

IOCTL_GPIO_SET_DEBOUNCE_TIME_IN debounce;

debounce.gpioId = s_TouchDevice.nPenGPIO;

debounce.debounceTime = 10;

I added the function call GPIOIoControl() as above and got a compile error. Is this method of setting GPIO debounce time intentionally eliminated in the new BSP?

Thanks,

Luan

over 14 years ago

0 Anthony Pellerin over 14 years ago

Prodigy 10 points

Hi Luan,

GPIOIoControl() is still present in the Unified BSP and has not been removed. Try to include "sdk_gpio.h" in your code and relaunch the build to see if you get past this compilation error. If you still get a build issue, please provide error log to help us debug your issue.

0 Luan Le over 14 years ago in reply to Anthony Pellerin

Expert 2280 points

Hi Anthony,

I already had "sdk_gpio.h" included. I should have reported that it passed the compilation but failed the linking stage as shown below

BUILD: [01:0000010494:PROGC ] Linking C:\WINCE600\platform\EVM_OMAP3530\target\ARMV4I\retail\TSC2046_touch.dll

BUILD: [01:0000010783:ERRORE] touchscreen.obj : error LNK2019: unresolved external symbol GPIOIoControl referenced in function "int __cdecl PddInitializeHardware(void)" (?PddInitializeHardware@@YAHXZ)

BUILD: [01:0000010784:ERRORE] C:\WINCE600\platform\EVM_OMAP3530\target\ARMV4I\retail\TSC2046_touch.dll : fatal error LNK1120: 1 unresolved externals.

This is the original sample project for EVM3530. All I did was adding the GPIOIoControl() call to function PddInitializeHardware() in touchscreen.c as we had in BSP6.15.00.

Thanks for your help,

Luan

0 DavidVescovi over 14 years ago in reply to Luan Le

Genius 5470 points

I am seeing this problem also. He is correct the line to set the debounce time in the touch driver is missing and the wrapper function is also missing.

I believe the GPIOIoControl function needs to be added to the gpio_dispatch.c file. It is in the header file but is not implemented.

I do not believe you could do a DeviceIoControl directly from the touch file as the context handle would be wrong.

0 Madhvi over 14 years ago in reply to DavidVescovi

TI__Expert 5320 points

You can implement GPIOIocontrol in the gpio_dispatch files (both OAL and DEVICE) and filling up the right function pointer in interface table during IOCTL_DDK_GET_DRIVER_IFC IOCTL in xxx_gpio.cpp files

you could use the simple workaround in touchscreen.cpp as follows:

    // Set debounce time on GPIO
    IOCTL_GPIO_SET_DEBOUNCE_TIME_IN debounce;

    debounce.gpioId = s_TouchDevice.nPenGPIO;
    debounce.debounceTime = 10;

    HANDLE hTempGPIO = NULL;
    hTempGPIO = CreateFile(L"GIO1:",
                       GENERIC_READ|GENERIC_WRITE,
                       FILE_SHARE_READ|FILE_SHARE_WRITE,
                       NULL,
                       OPEN_EXISTING,
                       0,
                       NULL);

    DeviceIoControl(hTempGPIO, IOCTL_GPIO_SET_DEBOUNCE_TIME, (UCHAR*)&debounce, sizeof(debounce), NULL, 0, NULL, NULL);
    CloseHandle(hTempGPIO);

-Madhvi

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How to set GPIO Debounce time with Unified BSP 1.00?