C6745 GPIO problem

Alex Savitskiy

Expert 1230 points

Hello.

I have C6745 DSK and cslr library.

My GPIO example working only when:

/** @brief Base address of GPIO memory mapped registers */
#define CSL_GPIO_0_REGS (0x01E26000u)

but in [SPRS377F – SEPTEMBER 2008–REVISED JUNE 2014] document we have the next:

Where is a mistake?

2) I am using Bank_1 -> Pin_5

When i write:

/* Configure GPIO1_5 (GPIO1_5_PIN) as an output */
gpioRegs->BANK[1].DIR &= ~(CSL_GPIO_DIR_DIR_IN << CSL_GPIO_DIR_DIR5_SHIFT); - it is not work

but when i write the next:

/* Configure GPIO1_5 (GPIO1_5_PIN) as an output */
gpioRegs->BANK[0].DIR &= ~(CSL_GPIO_DIR_DIR_IN << CSL_GPIO_DIR_DIR21_SHIFT); - it is work fine

Is it correct ?

What values takes X in BANK[X].DIR ?

Where it can be read ?

over 8 years ago

0 Arvind Singh over 8 years ago

Mastermind 6115 points

Hi Alex,

SPRS377F datasheet is common for both C6747 and C6745.
In C6747 USB1 is present which uses address 0x01E25000 but this peripheral is not present in C6745,So these address are kept unused in C6745.
You can cross verify GPIO address in datasheet's chapter 6.8 (General-Purpose Input/Output) in datasheet itself.

What values takes X in BANK[X].DIR ?

Here X corresponds to the bank which you are using, For example
X=0 for bank 0
X=1 for bank 1 etc

Where it can be read ?

By reading the pin name itself you will get to know to which bank that pin belongs to.
for example,
If pin name is GP0[12] - It belongs to Bank 0. Means here 'X' value will be 0.
If pin name is GP2[1] - It belongs to bank 2. Means here 'X' value will be 2.

0 Alex Savitskiy over 8 years ago in reply to Arvind Singh

Expert 1230 points

Ok , thank for your help.

I continued to experiment with Gpio interrupt, but my source code is not work fine (I did not get into the interrupt handler).

LED connected to GP1[5], SW connected to GP1[4].

Where is my mistake ?

#include <stdio.h>
#include <c6x.h>
#include <cslr_gpio.h>
#include <cslr_syscfg_C6745.h>
#include <soc_C6745.h>
#include <cslr_psc_C6745.h>
#include <cslr_dspintc.h>

/*============================================================================*/
/*                             GLOBAL VARIABLES                               */
/*============================================================================*/

/* sys config registers overlay                                               */
CSL_SyscfgRegsOvly   sysRegs  = (CSL_SyscfgRegsOvly)(CSL_SYSCFG_0_REGS);
/* Psc register overlay                                                       */
CSL_PscRegsOvly      psc1Regs = (CSL_PscRegsOvly)(CSL_PSC_1_REGS);
/* Gpio register overlay                                                      */
CSL_GpioRegsOvly     gpioRegs = (CSL_GpioRegsOvly)(CSL_GPIO_0_REGS);
/* Interrupt Controller Register Overlay                                      */
CSL_DspintcRegsOvly intcRegs = (CSL_DspintcRegsOvly)CSL_INTC_0_REGS;

/*============================================================================*/
/*                        EXTERNAL FUNCTION PROTOTYPES                        */
/*============================================================================*/

extern void intcVectorTable(void);



volatile Int32 status = 0;

#define GPIO0_EVENT    65
#define MAX_BLINK       4



void gpioExample(void)
{
    volatile Uint32 temp = 0;
    volatile Uint32 pscTimeoutCount = 10240u;

    /* Key to be written to enable the pin mux registers to be written        */
    sysRegs->KICK0R = 0x83e70b13;
    sysRegs->KICK1R = 0x95A4F1E0;

    /* mux between EMA_A[4] and GPIO1_4 : enable GPIO1_4 (User Switch - "SW3-1")  */
    sysRegs->PINMUX16 = ( (CSL_SYSCFG_PINMUX16_PINMUX16_11_8_GPIO1_4) << \
                        (CSL_SYSCFG_PINMUX16_PINMUX16_11_8_SHIFT) );

    /* mux between EMA_A[5] and GPIO1_5 : enable GPIO1_5 (User Led - "DS1")    */
    sysRegs->PINMUX16 = ( (CSL_SYSCFG_PINMUX16_PINMUX16_15_12_GPIO1_5) << \
                        (CSL_SYSCFG_PINMUX16_PINMUX16_15_12_SHIFT)  );

  /* Bring the GPIO module out of sleep state                                 */
  /* Configure the GPIO Module to Enable state */
  psc1Regs->MDCTL[CSL_PSC_GPIO] =
                              ( (psc1Regs->MDCTL[CSL_PSC_GPIO] & 0xFFFFFFE0) | \
                                 CSL_PSC_MDSTAT_STATE_ENABLE );
  /* Kick start the Enable Command */
  temp = psc1Regs->PTCMD;
  temp = ( (temp & CSL_PSC_PTCMD_GO0_MASK) |
           (CSL_PSC_PTCMD_GO0_SET << CSL_PSC_PTCMD_GO0_SHIFT) );
  psc1Regs->PTCMD |= temp;

  /*Wait for the power state transition to occur */
  while ( ((psc1Regs->PTSTAT & (CSL_PSC_PTSTAT_GOSTAT0_IN_TRANSITION)) != 0)
                     && (pscTimeoutCount>0) )
  {
      pscTimeoutCount--;
  }

  /* Check if PSC state transition timed out */
  if(pscTimeoutCount == 0)
  {
      printf("GPIO PSC transition to ON state timed out\n");
      return;
  }

  /* Wait for MODSTAT = ENABLE/DISABLE from LPSC */
  pscTimeoutCount = 10240u;
  while( ((psc1Regs->MDSTAT[CSL_PSC_GPIO] & (CSL_PSC_MDSTAT_STATE_MASK))
                != CSL_PSC_MDSTAT_STATE_ENABLE) && (pscTimeoutCount>0))
  {
      pscTimeoutCount--;
  }

  /* If timeout, the resource may not be functioning */
  if (0 == pscTimeoutCount)
  {
     printf("GPIO Module Enable timed out\n");
     return;
  }

  /* Configure GPIO1_5 (GPIO1_5_PIN) as an output */
  gpioRegs->BANK[0].DIR &=  ~(CSL_GPIO_DIR_DIR_IN << CSL_GPIO_DIR_DIR21_SHIFT);


  /* Configure GPIO1_4 (GPIO1_4_PIN) as an input */
  temp =  gpioRegs->BANK[0].DIR;
  temp = ( (temp & CSL_GPIO_DIR_DIR20_MASK) |
                      (CSL_GPIO_DIR_DIR_IN << CSL_GPIO_DIR_DIR20_SHIFT) );
  gpioRegs->BANK[0].DIR |= temp;




  /* Enable GPIO Bank interrupt for bank 1                                   */
    temp = gpioRegs->BINTEN;
    temp = ( (temp & CSL_GPIO_BINTEN_EN1_MASK) |
                      (CSL_GPIO_BINTEN_EN1_ENABLE << CSL_GPIO_BINTEN_EN1_SHIFT) );
    gpioRegs->BINTEN |= temp;

    /* Configure GPIO(GPIO1_4_PIN) to generate interrupt on rising edge         */
    temp = gpioRegs->BANK[0].SET_RIS_TRIG;
    temp = ( (temp & CSL_GPIO_SET_RIS_TRIG_SETRIS20_MASK) |
              (CSL_GPIO_SET_RIS_TRIG_SETRIS_ENABLE << CSL_GPIO_SET_RIS_TRIG_SETRIS20_SHIFT) );
    gpioRegs->BANK[0].SET_RIS_TRIG |= temp;

      /* map GPIO bank 0 event to cpu int4                                      */
      CSL_FINS(intcRegs->INTMUX1, DSPINTC_INTMUX1_INTSEL4,GPIO0_EVENT);

      /* set ISTP to point to the vector table address                          */
      ISTP = (unsigned int)intcVectorTable;

      /* clear all interrupts, bits 4 thru 15                                   */
      ICR = 0xFFF0;

      /* enable the bits for non maskable interrupt and CPUINT4                 */
      IER = 0x12;

      /* enable interrupts, set GIE bit                                         */
      _enable_interrupts();


    while (1);

}



void main (void)
{
   gpioExample();
   while(1);
}





interrupt void GPIO_input_isr()
{
    status=1;
}

0 Titusrathinaraj Stalin over 8 years ago in reply to Alex Savitskiy

TI__Guru** 116100 points

Which package and example are you working ?
Is that your own code or TI provided ?

0 Titusrathinaraj Stalin over 8 years ago in reply to Alex Savitskiy

TI__Guru** 116100 points

Hi,
Have you debugged and ensure that pinmux register got set for GPIO.
I suspect that problem would be from interrupt part.
You might need 'intvecs.asm" code to map DSP interrupts.
I would like you to suggest to use the following example from "quickStart" package and you can modify it as per your requirement.
C:\ti\quickStartOMAPL1x_rCSL\OMAPL1x\rCSL_examples\evmOMAPL137\DSP_examples\gpio\GPIO_multi_led_interrupt_dspL137\src

Revert to us if any clarification required.

0 Alex Savitskiy over 8 years ago in reply to Titusrathinaraj Stalin

Expert 1230 points

This is changed gpio example from pspdrivers_01_30_01 package.

0 Titusrathinaraj Stalin over 8 years ago in reply to Alex Savitskiy

TI__Guru** 116100 points

Hi Alex,
Did you try the following code ?
C:\ti\pspdrivers_01_30_00_06\packages\ti\pspiom\examples\evm6747\gpio\build\ccs3

I've tried the following code now and able to generate interrupt SW3-1 and start to blink LED DS1 on OMAPL137 EVM board.
Also it would work with C6747 EVM board too.

0 Alex Savitskiy over 8 years ago in reply to Titusrathinaraj Stalin

Expert 1230 points

Yes, I try the following code:

C:\ti\pspdrivers_01_30_00_06\packages\ti\pspiom\examples\evm6747\gpio.

But I have C6745 board and i modify the above mentioned code.

C6745 board:

LED connected to GP1[5]

SW connected to GP1[4]

evm6747:

LED connected to GPIO0_12

SW connected to GPIO0_8

invecs.asm file:

; * ============================================================================
; * Copyright (c) Texas Instruments Inc 2002, 2003, 2004, 2005, 2006, 2007
; *
; * Use of this software is controlled by the terms and conditions found
; * in the license agreement under which this software has been supplied.
; * ============================================================================

; * ============================================================================
; * @brief Interrupt vector file for C64x and C64x+.
; *
; * @file  intvecs.asm
; *
; * @verbatim
;   This file contains interrupt service table.  The CPU interrupt 4 vector
;   contains interrupt4 function.
;   @endverbatim
; *
; * ============================================================================

; Global symbols defined here and exported out of this file
   .global _intcVectorTable
   .global _c_int00
   .global _vector1
   .global _vector2
   .global _vector3
   .global _GPIO_input_isr
   .global _vector5
   .global _vector6
   .global _vector7
   .global _vector8
   .global _vector9
   .global _vector10
   .global _vector11


; This is a macro that instantiates one entry in the interrupt service table.
VEC_ENTRY .macro addr
    STW   B0,*--B15
    MVKL  addr,B0
    MVKH  addr,B0
    B     B0
    LDW   *B15++,B0
    NOP   2
    NOP
    NOP
   .endm

; This is a dummy interrupt service routine used to initialize the IST.
_vec_dummy:
  B    B3
  NOP  5

; This is the actual interrupt service table (IST).
 .sect ".vecs"
 .align 1024

_intcVectorTable:
_vector0:   VEC_ENTRY _c_int00      ;RESET
_vector1:   VEC_ENTRY _vec_dummy    ;NMI
_vector2:   VEC_ENTRY _vec_dummy    ;RSVD
_vector3:   VEC_ENTRY _vec_dummy    ;RSVD
_vector4:   VEC_ENTRY _GPIO_input_isr ;Interrupt4 ISR
_vector5:   VEC_ENTRY _vec_dummy
_vector6:   VEC_ENTRY _vec_dummy
_vector7:   VEC_ENTRY _vec_dummy
_vector8:   VEC_ENTRY _vec_dummy
_vector9:   VEC_ENTRY _vec_dummy
_vector10:  VEC_ENTRY _vec_dummy
_vector11:  VEC_ENTRY _vec_dummy


;* =============================================================================
;*   Automated Revision Information
;*   Changed: $Date: 2007-09-11 11:05:40 -0500 (Tue, 11 Sep 2007) $
;*   Revision: $Revision: 3960 $
;* =============================================================================

0 Alex Savitskiy over 8 years ago in reply to Alex Savitskiy

Expert 1230 points

Hi, thanks for your help.

I found some bugs in my code:

1) Have you debugged and ensure that pinmux register got set for GPIO.

sysRegs->PINMUX16 |= ( (CSL_SYSCFG_PINMUX16_PINMUX16_15_12_GPIO1_5) << \
(CSL_SYSCFG_PINMUX16_PINMUX16_15_12_SHIFT) ); // Necessary to use or - operator [a | b]

Now it works fine, but I do not still go to the interrupt handler.

0 Titusrathinaraj Stalin over 8 years ago in reply to Alex Savitskiy

TI__Guru** 116100 points

Able to toggle your board LED ?
Have you enabled your board appropriate GPIO (switch) BANK ?

0 Alex Savitskiy over 8 years ago in reply to Titusrathinaraj Stalin

Expert 1230 points

1) Yes, LED is blinking on my board successfully.

2) I have the next:

I'm not sure that INMUX1 register is correctly set for my pins.

When i am press the switch SW-1 on GP1[4] pin i have the next:

0 Alex Savitskiy over 8 years ago in reply to Alex Savitskiy

Expert 1230 points

I don't understand what GPIO0_EVENT I must use in my program.
#define GPIO0_EVENT 65
This can be a problem ?

0 Alex Savitskiy over 8 years ago in reply to Alex Savitskiy

Expert 1230 points

I solved my problem.

This is a bug in my code:
GPIO0_EVENT 65 // GPIO_B0INT GPIO Bank 0 Interrupt

It must be so:
GPIO0_EVENT 41 // GPIO_B1INT GPIO Bank 1 Interrupt

0 Titusrathinaraj Stalin over 8 years ago in reply to Alex Savitskiy

TI__Guru** 116100 points

Great! sounds good.
Thanks for your update.

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C6745 GPIO problem