How to control the GPIO of expansion bank J14, J15

Amlan Senapati

Intellectual 400 points

Dear Community,

I need to control a external system by C6748 LCDK board.

I am thinking to use GPIO pins of Expansion bank of J14 and J15 of C6748 LCDK board?

When I am trying to use GPIO Expansion pins of the board (GPIO8-12 or GPIO8-10??)

GPIOBank8Pin16PinMuxSetup();

It shows the following error .

Description Resource Path Location Type unresolved symbol GPIOBank8Pin16PinMuxSetup, first referenced in ./main.obj gpio_c674x_c6748_lcdkC6748 C/C++ Problem.

How can I use GPIO expansion pins??

With regards,

over 9 years ago

0 Shankari G over 9 years ago

TI__Mastermind 43955 points

Hi Amlan,

Able to understand the code (PINMUX) in this link which I posted ?

It has some PINMUX for various GPIOs.

So that you can add your own function to do the PINMUX for any GPIO.

For ex, I give you the code for GPIO8-10, you please understand and change it for GPIO8-12

#include "hw_types.h"
#include "hw_syscfg0_OMAPL138.h"

/* Pin Multiplexing bit mask to select GP8[10] pin. */
#define PINMUX18_GPIO8_10_ENABLE (SYSCFG_PINMUX18_PINMUX18_31_28_GPIO8_10 << \
SYSCFG_PINMUX18_PINMUX18_31_28_SHIFT)


void GPIOBank8Pin10PinMuxSetup(void)
{
unsigned int savePinmux = 0;

/*
** Clearing the bit in context and retaining the other bit values
** in PINMUX10 register.
*/
savePinmux = (HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(18)) &
~(SYSCFG_PINMUX18_PINMUX18_31_28));

/* Setting the pins corresponding to GP8[10] in PINMUX10 register.*/
HWREG(SOC_SYSCFG_0_REGS + SYSCFG0_PINMUX(18)) =
(PINMUX18_GPIO8_10_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);

/* Initializes the UART instance.*/
UARTStdioInit();

/* Pin Multiplexing of pin 10 of GPIO Bank 8.*/
GPIOBank8Pin10PinMuxSetup();


GPIODirModeSet(SOC_GPIO_0_REGS, 139, GPIO_DIR_OUTPUT);

while(1)
{
GPIOPinWrite(SOC_GPIO_0_REGS, 139, GPIO_PIN_LOW);

Delay(1000000);

GPIOPinWrite(SOC_GPIO_0_REGS, 139, GPIO_PIN_HIGH);

Delay(1000000);

}

return 0;
}

Can you please try this code and let me know ?

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How to control the GPIO of expansion bank J14, J15