[AM335X WINCE7][BSP_WINCE_ARM_A8_02_30_00_Source.exe]GPIO3_19 set failure

I will use GPIO3_19 to control LCD POWER ON. So I add below red code to turn on the power of LCD blacklight

but when run below red code, the wince system will stop. I don't why? How to control GPIO3_19?

Lcdc.c (platform\am33x_bsp\src\bsp_common\lcdc) 

BOOL SetBacklightLevel_GPIO(UINT level)

{    

 DWORD rc = TRUE;     HANDLE g_hGpio = NULL;  RETAILMSG(1,(TEXT("SetBacklightLevel_GPIO=============+++++\r\n")));       if(!g_hGpio)     {        // Configure Backlight/Power pins as outputs        g_hGpio = GPIOOpen();     if (g_hGpio == NULL)  {   RETAILMSG(1, (L"AM33x:Failed to open GPIO driver"));   return FALSE;  }     }

    /* turn on backlight non-zero level */      if (level)     {         GPIOSetBit(g_hGpio, BSP_LCD_BACKLIGHT_GPIO);         GPIOSetMode(g_hGpio, BSP_LCD_BACKLIGHT_GPIO, GPIO_DIR_OUTPUT );        }     else if (level == 0 )     {         GPIOClrBit(g_hGpio, BSP_LCD_BACKLIGHT_GPIO);     }    RETAILMSG(1,(TEXT("SetBacklightLevel_GPIO 2222222222+++%d++\r\n"), level));     GPIOSetMode(g_hGpio, ((3<<5)|(19)), GPIO_DIR_OUTPUT );  RETAILMSG(1,(TEXT("SetBacklightLevel_GPIO —–111—-\r\n")));     GPIOSetBit(g_hGpio, ((3<<5)|(19)));  RETAILMSG(1,(TEXT("SetBacklightLevel_GPIO —–222—-\r\n")));

    if(g_hGpio)  GPIOClose(g_hGpio);       return rc; }

Gino E：

你好，

这个现象应该是你在初始化GPIO3口的时候，只是初始化了GPIO3模块，而忘了初始化controlmodule模块，这种情况下访问GPIO3模块，会导致系统假死。正常流程是要将使用的pin脚先设置为GPIO mode。如何配置寄存器可以参考TRM control module模块。