Freedom Board KL25Z basic port pin operation

[rkyrlach]

Hello,

I am trying to get my feet on the ground with the little $12 Freedom board with basic bit IO.

Debug shows the bits are changing but nothing happens... no LED... nothing on the meter.

Obviously I am missing something...

please help.

thanks

Richard

CODE:

typedef union { unsigned long all;  

                struct {

                         unsigned long PIN0:1;

                         unsigned long PIN1:1;

                         unsigned long PIN2:1;

                         unsigned long PIN3:1;

                         unsigned long PIN4:1;

                         unsigned long PIN5:1;

                         unsigned long PIN6:1;

                         unsigned long PIN7:1;

                         unsigned long PIN8:1;

                         unsigned long PIN9:1;

                         unsigned long PIN10:1;

                         unsigned long PIN11:1;

                         unsigned long PIN12:1;

                         unsigned long PIN13:1;

                         unsigned long PIN14:1;

                         unsigned long PIN15:1;

                         unsigned long PIN16:1;

                         unsigned long PIN17:1;

                         unsigned long PIN18:1;

                         unsigned long PIN19:1;

                         unsigned long PIN20:1;

                         unsigned long PIN21:1;

                         unsigned long PIN22:1;

                         unsigned long PIN23:1;

                         unsigned long PIN24:1;

                         unsigned long PIN25:1;

                         unsigned long PIN26:1;

                         unsigned long PIN27:1;

                         unsigned long PIN28:1;

                         unsigned long PIN29:1;

                         unsigned long PIN30:1;

                         unsigned long PIN31:1;

                        }bit;

    }port_t;

#define P_A                ((port_t *) 0x400ff000)

#define P_A_S              ((port_t *) 0x400ff004)

#define P_A_C              ((port_t *) 0x400ff008)

#define P_A_T              ((port_t *) 0x400ff00C)

#define P_A_I              ((port_t *) 0x400ff010)

#define P_A_D              ((port_t *) 0x400ff014)

#define P_B                ((port_t *) 0x400ff040)

#define P_B_S              ((port_t *) 0x400ff044)

#define P_B_C              ((port_t *) 0x400ff048)

#define P_B_T              ((port_t *) 0x400ff04C)

#define P_B_I              ((port_t *) 0x400ff050)

#define P_B_D              ((port_t *) 0x400ff054)

#define P_C                ((port_t *) 0x400ff080)

#define P_C_S              ((port_t *) 0x400ff084)

#define P_C_C              ((port_t *) 0x400ff088)

#define P_C_T              ((port_t *) 0x400ff08C)

#define P_C_I              ((port_t *) 0x400ff090)

#define P_C_D              ((port_t *) 0x400ff094)

#define P_D                ((port_t *) 0x400ff0C0)

#define P_D_S              ((port_t *) 0x400ff0C4)

#define P_D_C              ((port_t *) 0x400ff0C8)

#define P_D_T              ((port_t *) 0x400ff0CC)

#define P_D_I              ((port_t *) 0x400ff0D0)

#define P_D_D              ((port_t *) 0x400ff0D4)

#define P_E                ((port_t *) 0x400ff100)

#define P_E_S              ((port_t *) 0x400ff104)

#define P_E_C              ((port_t *) 0x400ff108)

#define P_E_T              ((port_t *) 0x400ff10C)

#define P_E_I              ((port_t *) 0x400ff110)

#define P_E_D              ((port_t *) 0x400ff114)

int main(void)

{

    unsigned long b1;

    unsigned long cnt=0;

    b1=P_D_D->bit.PIN1=1;

       b1=P_B_D->bit.PIN0=1;

       b1=P_E_D->bit.PIN20=1;

    while(1)

    {

        for(cnt = 0; cnt < 126000; cnt++)

            {

               b1=P_D->bit.PIN1=0;

               b1=P_B->bit.PIN0=0;

               b1=P_E->bit.PIN20=0;

            }

        for(cnt = 0; cnt < 126000; cnt++)

            {

               b1=P_D->bit.PIN1=1;

               b1=P_B->bit.PIN0=1;

               b1=P_E->bit.PIN20=1;

            }

    }

}

[rkyrlach · Accepted solution]

found the answer... I needed some initializations:

      /* disable COP */

      SIM_COPC = 0;

      /* enable clocks for PORTB, PORTD and PORTE */

      SIM_SCGC5 |= SIM_SCGC5_PORTB_MASK;

      SIM_SCGC5 |= SIM_SCGC5_PORTD_MASK;

      SIM_SCGC5 |= SIM_SCGC5_PORTE_MASK;

      /* set B18, B19, D1 to GPIO */

      PORTB_PCR18 = PORT_PCR_MUX(1);

      PORTB_PCR19 = PORT_PCR_MUX(1);

      PORTD_PCR1 = PORT_PCR_MUX(1);

      PORTB_PCR0 = PORT_PCR_MUX(1);

      PORTE_PCR20 = PORT_PCR_MUX(1);

works now

[adriansc]

Hi,

Good luck with your project!! That is right, all the modules need its clock gate enable and SIM_SCGCx contains the field to do that for each module.

Also each pin has different functions that is why you need to configure the Pin Assignments.

Regards.

[rkyrlach]

thanks

On Wed, Feb 13, 2013 at 11:19 AM, Adrian Sanchez Cano <