Configuring GPIO port pin as output(for acting as FSS) for oled SSI Communiation .

Hi

Can any one please cross check the way i am trying to make GPIO port pin as output for making it to act as Chip select in OLED SSI communication.

Connection of "Reset " of oled is given to reset of tm4c123gh6pm.

In the code I am trying to make Port A6 as the FSS pin , by trying to configure the GPIO pin as output.

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_6, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
GPIODirModeSet(GPIO_PORTA_BASE, GPIO_PIN_6 , GPIO_DIR_MODE_OUT);

Can I please get the quick response please.

#define DISPLAY_SSI_PERIPH          SYSCTL_PERIPH_SSI0
#define DISPLAY_SSI_GPIO_PERIPH     SYSCTL_PERIPH_GPIOA

#define DISPLAY_PINCFG_SSICLK       GPIO_PA2_SSI0CLK
#define DISPLAY_PINCFG_SSITX        GPIO_PA5_SSI0TX

#define DISPLAY_SSI_PORT            GPIO_PORTA_BASE
#define DISPLAY_SSI_PINS            (GPIO_PIN_2 | GPIO_PIN_6 | GPIO_PIN_5)

#define DISPLAY_D_C_PORT            GPIO_PORTA_BASE
#define DISPLAY_D_C_PIN             GPIO_PIN_7

#define DISPLAY_ENV_PORT            GPIO_PORTA_BASE
#define DISPLAY_ENV_PIN             GPIO_PIN_4

//*******************************SSD1306_SPI_INIT****************************
void SSD1306_SPI_Init(void)
{
  
     // Enable the peripherals used by this driver
    SysCtlPeripheralEnable(DISPLAY_SSI_PERIPH);
    SysCtlPeripheralEnable(DISPLAY_SSI_GPIO_PERIPH);
    
    // Select the SSI function for the appropriate pins
    GPIOPinConfigure(DISPLAY_PINCFG_SSICLK);

   SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
   GPIOPadConfigSet(GPIO_PORTA_BASE, GPIO_PIN_6, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
   GPIODirModeSet(GPIO_PORTA_BASE, GPIO_PIN_6 , GPIO_DIR_MODE_OUT); 

    GPIOPinConfigure(DISPLAY_PINCFG_SSITX);

    // Configure the pins for the SSI function
    GPIOPinTypeSSI(DISPLAY_SSI_PORT, DISPLAY_SSI_PINS);

    // Configure display control pins as GPIO output
    GPIOPinTypeGPIOOutput(DISPLAY_D_C_PORT, DISPLAY_D_C_PIN);
		   
    // Configure the SSI port
    SSIDisable(DISPLAY_SSI_BASE);
    SSIConfigSetExpClk( DISPLAY_SSI_BASE, SysCtlClockGet(),
                        SSI_FRF_MOTO_MODE_3, SSI_MODE_MASTER,
                        DISPLAY_SSI_CLOCK, 0x08 );
    SSIEnable(DISPLAY_SSI_BASE);

    // Send the initial configuration command bytes to the display
    SSD1306WriteCommand( g_ucDisplayInitCommands,
                         sizeof(g_ucDisplayInitCommands) );
  			
    //Set_Display_On_Off(0x01);
    gs_ucOled_Temp_Address_Array[0x00] = 0x01;
    SSD1306WriteCommand( gs_ucOled_Temp_Address_Array,
                         sizeof(gs_ucOled_Temp_Address_Array) );
    
	
 
}
//*******************************SSD1306WriteCommand****************************

static void
SSD1306WriteCommand(const unsigned char *pcCmd, unsigned long ulCount)
{
    // Wait for any previous SSI operation to finish.
    while(ROM_SSIBusy(DISPLAY_SSI_BASE))
    {
    }

    //Set the D/C pin low to indicate command
    GPIOPinWrite(DISPLAY_D_C_PORT, DISPLAY_D_C_PIN, 0);
   GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6,0);//cs=0
	
    // Send all the command bytes to the display
    while(ulCount--)
    {
        SSIDataPut(DISPLAY_SSI_BASE, *pcCmd);
        pcCmd++;
    }
	
    GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6, GPIO_PIN_6);//cs=1
}

//*******************************SSD1306WriteData****************************


static void
SSD1306WriteData(const unsigned char *pcData, unsigned long ulCount)
{
    // Wait for any previous SSI operation to finish.
    while(ROM_SSIBusy(DISPLAY_SSI_BASE))
    {
    }

    // Set the D/C pin high to indicate data 
    GPIOPinWrite(DISPLAY_D_C_PORT, DISPLAY_D_C_PIN, DISPLAY_D_C_PIN);
   GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6,0);//cs=0

    // Send all the data bytes to the display
    while(ulCount--)
    {
       SSIDataPut(DISPLAY_SSI_BASE, *pcData);
        pcData++;
    }
		
   GPIOPinWrite(GPIO_PORTA_BASE, GPIO_PIN_6,GPIO_PIN_6);//cs=1
}

//*************************************main**********************************
main()
{
     SSD1306_SPI_Init();
    Clr_Screen(0x00); // function for clr_screen
    OLED_String_Display( 1, "Texas", 0x01, 0x25 ); // function to display string on row 0x01 and column 0x25
}