How to blink inerfaced LED at GPIO Expansion of C6748 LCDK?

Hi Amlan,
Here is the code for doing PINMUX for various GPIOs (LED & Switch) on LCDK board.

/**

* \file gpio_switches_leds.c

*

* \brief This is a sample application file demonstrating the use of

* a GPIO pin for input and output

*

*

* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

*

* Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

*

* Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the

* distribution.

*

* Neither the name of Texas Instruments Incorporated nor the names of

* its contributors may be used to endorse or promote products derived

* from this software without specific prior written permission.

*

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/


#include<stdio.h>


#include "gpio.h"

#include "psc.h"


#include "soc_OMAPL138.h"

#include "lcdkOMAPL138.h"


/* HW Macros */

#include "hw_types.h"


/* System Defines */

#include "lcdkOMAPL138.h"

#include "soc_OMAPL138.h"

#include "hw_syscfg0_OMAPL138.h"




/* Switch Configuration */


/* GP0[1] to GP0[4] is mapped to SW1[3:4] on OMAPL138/C6748 LCDK boards */


/* Pin Multiplexing bit mask to select GP0[1] to GP0[4] pin. */


#define PINMUX1_GPIO0_1_ENABLE (SYSCFG_PINMUX1_PINMUX1_27_24_GPIO0_1 << \

SYSCFG_PINMUX1_PINMUX1_27_24_SHIFT)


#define PINMUX1_GPIO0_2_ENABLE (SYSCFG_PINMUX1_PINMUX1_23_20_GPIO0_2 << \

SYSCFG_PINMUX1_PINMUX1_23_20_SHIFT)


#define PINMUX1_GPIO0_3_ENABLE (SYSCFG_PINMUX1_PINMUX1_19_16_GPIO0_3 << \

SYSCFG_PINMUX1_PINMUX1_19_16_SHIFT)


#define PINMUX1_GPIO0_4_ENABLE (SYSCFG_PINMUX1_PINMUX1_15_12_GPIO0_4 << \

SYSCFG_PINMUX1_PINMUX1_15_12_SHIFT)



/* LED Configuration */


/* GP6[12], GP6[13], GP2[12] and GP0[9] is mapped to D4, D5, D6, D7 LEDs on OMAPL138/C6748 LCDK boards */


/* Pin Multiplexing bit mask to select GP6[12] pin. */

#define PINMUX13_GPIO6_12_ENABLE (SYSCFG_PINMUX13_PINMUX13_15_12_GPIO6_12 << \

SYSCFG_PINMUX13_PINMUX13_15_12_SHIFT)


/* Pin Multiplexing bit mask to select GP6[13] pin. */

#define PINMUX13_GPIO6_13_ENABLE (SYSCFG_PINMUX13_PINMUX13_11_8_GPIO6_13 << \

SYSCFG_PINMUX13_PINMUX13_11_8_SHIFT)


/* Pin Multiplexing bit mask to select GP2[12] pin. */

#define PINMUX5_GPIO2_12_ENABLE (SYSCFG_PINMUX5_PINMUX5_15_12_GPIO2_12 << \

SYSCFG_PINMUX5_PINMUX5_15_12_SHIFT)


/* Pin Multiplexing bit mask to select GP0[9] pin. */

#define PINMUX0_GPIO0_9_ENABLE (SYSCFG_PINMUX0_PINMUX0_27_24_GPIO0_9 << \

SYSCFG_PINMUX0_PINMUX0_27_24_SHIFT)



void PinMuxSetup_leds(void)

{

unsigned int savePinmux = 0;



/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX13 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(13)) &

~(SYSCFG_PINMUX13_PINMUX13_15_12));


/* Setting the pins corresponding to GP6[12] in PINMUX13 register.*/

HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(13)) =

(PINMUX13_GPIO6_12_ENABLE | savePinmux);



/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX13 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(13)) &

~(SYSCFG_PINMUX13_PINMUX13_11_8));


/* Setting the pins corresponding to GP6[13] in PINMUX13 register.*/

HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(13)) =

(PINMUX13_GPIO6_13_ENABLE | savePinmux);



/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX5 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(5)) &

~(SYSCFG_PINMUX5_PINMUX5_15_12));


/* Setting the pins corresponding to GP2[12] in PINMUX5 register.*/

HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(5)) =

(PINMUX5_GPIO2_12_ENABLE | savePinmux);



/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX0 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(0)) &

~(SYSCFG_PINMUX0_PINMUX0_27_24));


/* Setting the pins corresponding to GP0[9] in PINMUX0 register.*/

HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(0)) =

(PINMUX0_GPIO0_9_ENABLE | savePinmux);


}




void PinMuxSetup_switches(void)

{

unsigned int savePinmux = 0;


/* Setting the pins corresponding to GP0[1] in PINMUX1 register.*/


/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX1 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) &

~(SYSCFG_PINMUX1_PINMUX1_27_24));



HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) =

(PINMUX1_GPIO0_1_ENABLE | savePinmux);




/* Setting the pins corresponding to GP0[2] in PINMUX1 register.*/


/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX1 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) &

~(SYSCFG_PINMUX1_PINMUX1_23_20));



HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) =

(PINMUX1_GPIO0_2_ENABLE | savePinmux);





/* Setting the pins corresponding to GP0[3] in PINMUX1 register.*/


/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX1 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) &

~(SYSCFG_PINMUX1_PINMUX1_19_16));



HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) =

(PINMUX1_GPIO0_3_ENABLE | savePinmux);




/* Setting the pins corresponding to GP0[4] in PINMUX1 register.*/


/*

** Clearing the bit in context and retaining the other bit values

** in PINMUX1 register.

*/

savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) &

~(SYSCFG_PINMUX1_PINMUX1_15_12));



HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(1)) =

(PINMUX1_GPIO0_4_ENABLE | savePinmux);



}



int main(void)

{



/* The Local PSC number for GPIO is 3. GPIO belongs to PSC1 module.*/

PSCModuleControl(SOC_PSC_1_REGS, HW_PSC_GPIO, PSC_POWERDOMAIN_ALWAYS_ON,

PSC_MDCTL_NEXT_ENABLE);



/* Pin Multiplexing of pins GP0[1] to GP0[4] of GPIO Bank 2 for DIP SWITCHEs in OMAPL138 LCDK board */

PinMuxSetup_switches();


/* Pin Multiplexing of pins GP6[12], GP6[13], GP2[12], GP0[9], for LEDs in OMAPL138 LCDK board */

PinMuxSetup_leds();



/* 2,3,4,5 is the GPIO no for GP0[1] to GP0[4]; Refer page no 901 in OMAPL138/C6748 TRM */



/* SWITCHEs SETUP */


/* Sets the pin 2 (GP0[1]) as input.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 2, GPIO_DIR_INPUT);


/* Sets the pin 3 (GP0[2]) as input.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 3, GPIO_DIR_INPUT);


/* Sets the pin 4 (GP0[3]) as input.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 4, GPIO_DIR_INPUT);


/* Sets the pin 5 (GP0[4]) as input.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 5, GPIO_DIR_INPUT);


/* LEDs SETUP */


/* Sets the pin 109 (GP6[12]) as output.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 109, GPIO_DIR_OUTPUT);


/* Sets the pin 110 (GP6[13]) as output.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 110, GPIO_DIR_OUTPUT);


/* Sets the pin 45 (GP2[12]) as output.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 45, GPIO_DIR_OUTPUT);


/* Sets the pin 10 (GP0[9]) as output.*/

GPIODirModeSet(SOC_GPIO_0_REGS, 10, GPIO_DIR_OUTPUT);



while(1)

{


/* 2,3,4,5 is the GPIO no for GP0[1] to GP0[4]; Refer page no 901 in OMAPL138/C6748 TRM */


if (GPIOPinRead(SOC_GPIO_0_REGS, 2))

{


GPIOPinWrite(SOC_GPIO_0_REGS, 109, GPIO_PIN_LOW);

printf("S1 is not pressed\n");


}


else

{

printf("S1 is pressed\n");

GPIOPinWrite(SOC_GPIO_0_REGS, 109, GPIO_PIN_HIGH);


}


if (GPIOPinRead(SOC_GPIO_0_REGS, 3))

{


GPIOPinWrite(SOC_GPIO_0_REGS, 110, GPIO_PIN_LOW);

printf("S2 is not pressed\n");


}

else

{

printf("S2 is pressed\n");

GPIOPinWrite(SOC_GPIO_0_REGS, 110, GPIO_PIN_HIGH);


}



if (GPIOPinRead(SOC_GPIO_0_REGS, 4))

{


GPIOPinWrite(SOC_GPIO_0_REGS, 45, GPIO_PIN_LOW);

printf("S3 is not pressed\n");


}

else

{

printf("S3 is pressed\n");

GPIOPinWrite(SOC_GPIO_0_REGS, 45, GPIO_PIN_HIGH);


}



if (GPIOPinRead(SOC_GPIO_0_REGS, 5))

{


GPIOPinWrite(SOC_GPIO_0_REGS, 10, GPIO_PIN_LOW);

printf("S4 is not pressed\n");



}

else

{

printf("S4 is pressed\n");

GPIOPinWrite(SOC_GPIO_0_REGS, 10, GPIO_PIN_HIGH);


}




}



}