Highest frequency?

Hi Aymen,

Until you mention on the controller you're working, one won't be able to comment!

So, which controller are you using ??

Regards,

Gautam

Hello Gautam,

i m working with the piccolo launchpad "c2000 launchpad XL" (TMS320F2802x).

best regards 

Aymen

Hi,

Make use of "GpioToggle" sample code from controlSuite. Remove delays during toggling and configure PLL as following:

// Setup the PLL for x12 /2 which will yield 60Mhz = 10Mhz * 12 / 2
    PLL_setup(myPll, PLL_Multiplier_12, PLL_DivideSelect_ClkIn_by_2);

This is the maximum setting as Launchpad operating frequency is 60MHz.

Check the waveform on DSO and revert. Good Luck.

Regards,

Gautam

Hello Gautam,

i used the code and i changed the frequency divider but. i got the max frequency 1.3MHz. 

hier is the code:

//#############################################################################
//
//  File:   f2802x_examples_ccsv4/gpio_toggle/Example_F2802xGpioToggle.c
//
//  Title:  F2802x Device GPIO toggle test program.
//
//  Group:          C2000
//  Target Device:  TMS320F2802x
//
//! \addtogroup example_list
//!  <h1>GPIO Toggle</h1>
//!
//!   Three different examples are included. Select the example
//!   (data, set/clear or toggle) to execute before compiling using
//!   the #define statements found at the top of the code.
//!
//!   ALL OF THE I/O'S TOGGLE IN THIS PROGRAM.  MAKE SURE
//!   THIS WILL NOT DAMAGE YOUR HARDWARE BEFORE RUNNING THIS
//!   EXAMPLE.
//!
//!   The pins can be observed using Oscilloscope.
//
//  (C) Copyright 2012, Texas Instruments, Inc.
//#############################################################################
// $TI Release: f2802x Support Library v200 $
// $Release Date: Tue Jul 24 10:01:39 CDT 2012 $
//#############################################################################

#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

#include "f2802x_common/include/clk.h"
#include "f2802x_common/include/flash.h"
#include "f2802x_common/include/gpio.h"
#include "f2802x_common/include/pie.h"
#include "f2802x_common/include/pll.h"
#include "f2802x_common/include/wdog.h"

// Select the example to compile in.  Only one example should be set as 1
// the rest should be set as 0.
#define EXAMPLE1 0   // Use DATA registers to toggle I/O's
#define EXAMPLE2 0  // Use SET/CLEAR registers to toggle I/O's
#define EXAMPLE3 1  // Use TOGGLE registers to toggle I/O's

// Prototype statements for functions found within this file.
void delay_loop(void);
void Gpio_select(void);
void Gpio_example1(void);
void Gpio_example2(void);
void Gpio_example3(void);

CLK_Handle myClk;
FLASH_Handle myFlash;
GPIO_Handle myGpio;
PIE_Handle myPie;

void main(void)
{
    CPU_Handle myCpu;
    PLL_Handle myPll;
    WDOG_Handle myWDog;
    
    // Initialize all the handles needed for this application
    myClk = CLK_init((void *)CLK_BASE_ADDR, sizeof(CLK_Obj));
    myCpu = CPU_init((void *)NULL, sizeof(CPU_Obj));
    myFlash = FLASH_init((void *)FLASH_BASE_ADDR, sizeof(FLASH_Obj));
    myGpio = GPIO_init((void *)GPIO_BASE_ADDR, sizeof(GPIO_Obj));
    myPie = PIE_init((void *)PIE_BASE_ADDR, sizeof(PIE_Obj));
    myPll = PLL_init((void *)PLL_BASE_ADDR, sizeof(PLL_Obj));
    myWDog = WDOG_init((void *)WDOG_BASE_ADDR, sizeof(WDOG_Obj));
    
    // Perform basic system initialization    
    WDOG_disable(myWDog);
    CLK_enableAdcClock(myClk);
    (*Device_cal)();
    CLK_disableAdcClock(myClk);
    
    //Select the internal oscillator 1 as the clock source
    CLK_setOscSrc(myClk, CLK_OscSrc_Internal);
    CLK_enableOsc1(myClk);
    
   // Setup the PLL for x10 /2 which will yield 50Mhz = 10Mhz * 10 / 2 PLL_setup(myPll, PLL_Multiplier_12, PLL_DivideSelect_ClkIn_by_1);
    
    // Disable the PIE and all interrupts
    PIE_disable(myPie);
    PIE_disableAllInts(myPie);
    CPU_disableGlobalInts(myCpu);
    CPU_clearIntFlags(myCpu);
    
    // If running from flash copy RAM only functions to RAM   
#ifdef _FLASH
    memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif

    // For this example use the following configuration:
    Gpio_select();

    // Setup a debug vector table and enable the PIE
    PIE_setDebugIntVectorTable(myPie);
    PIE_enable(myPie);


#if EXAMPLE1

    // This example uses DATA registers to toggle I/O's
    Gpio_example1();

#endif  // - EXAMPLE1

#if EXAMPLE2

    // This example uses SET/CLEAR registers to toggle I/O's
    Gpio_example2();

#endif  // - EXAMPLE2

#if EXAMPLE3

    // This example uses TOGGLE registers to toggle I/O's
    Gpio_example3();

#endif  // - EXAMPLE3

}

void delay_loop()
{
    short      i;
    for (i = 0; i < 1; i++) {}
}

void Gpio_example1(void)
{
    // Example 1:
    // Toggle I/Os using DATA registers

    for(;;) {
        ((GPIO_Obj *)myGpio)->GPADAT = 0xAAAAAAAA;
        ((GPIO_Obj *)myGpio)->GPBDAT = 0x0000000A;

        delay_loop();

        ((GPIO_Obj *)myGpio)->GPADAT = 0x55555555;
        ((GPIO_Obj *)myGpio)->GPBDAT = 0x00000005;

        delay_loop();
    }
}

void Gpio_example2(void)
{
    // Example 2:
    // Toggle I/Os using SET/CLEAR registers
    for(;;) {

        ((GPIO_Obj *)myGpio)->GPASET = 0xAAAAAAAA;
        ((GPIO_Obj *)myGpio)->GPACLEAR = 0x55555555;

        ((GPIO_Obj *)myGpio)->GPBSET = 0x0000000A;
        ((GPIO_Obj *)myGpio)->GPBCLEAR = 0x00000005;

        delay_loop();

        ((GPIO_Obj *)myGpio)->GPACLEAR = 0xAAAAAAAA;
        ((GPIO_Obj *)myGpio)->GPASET = 0x55555555;

        ((GPIO_Obj *)myGpio)->GPBCLEAR = 0x0000000A;
        ((GPIO_Obj *)myGpio)->GPBSET = 0x00000005;

        delay_loop();

    }
}

void Gpio_example3(void)
{
    // Example 3:
    // Toggle I/Os using TOGGLE registers

    // Set pins to a known state

    ((GPIO_Obj *)myGpio)->GPASET = 0xAAAAAAAA;
    ((GPIO_Obj *)myGpio)->GPACLEAR = 0x55555555;

    ((GPIO_Obj *)myGpio)->GPBSET = 0x0000000A;
    ((GPIO_Obj *)myGpio)->GPBCLEAR = 0x00000005;

    // Use TOGGLE registers to flip the state of
    // the pins.
    // Any bit set to a 1 will flip state (toggle)
    // Any bit set to a 0 will not toggle.

    for(;;) {
        ((GPIO_Obj *)myGpio)->GPATOGGLE = 0xFFFFFFFF;
        ((GPIO_Obj *)myGpio)->GPBTOGGLE = 0x0000000F;
        delay_loop();
    }
}

void Gpio_select(void)
{

    EALLOW;
    ((GPIO_Obj *)myGpio)->GPAMUX1 = 0x00000000;
    ((GPIO_Obj *)myGpio)->GPAMUX2 = 0x00000000;
    ((GPIO_Obj *)myGpio)->GPBMUX1 = 0x00000000;
    ((GPIO_Obj *)myGpio)->GPADIR = 0xFFFFFFFF;
    ((GPIO_Obj *)myGpio)->GPBDIR = 0x0000000F;
    EDIS;

}
//===========================================================================
// No more.
//===========================================================================

thanks for the help Gautam

Hi,

I guess you forgot to reduce/remove the delay elements.

delay_loop();

Regards,

Gautam

Hello Gautam,

so i delete the delay loop and i divide the frequency by 1, but i got bad results. The measured frequency is between 4.5MHz. i would like to achieve 13MHz. So can i try other microcontroller?

regards

Aymen

So can i try other microcontroller?

Considering the fact that you might've tried all possible clock combinations; you can. Before that, let me check with one of my kits; I'll check with F28069 mcu and inform you the results.

Regards,

Gautam

With F28069 @ 90 Mhz clock speed; I'm getting around 6.04MHz. I also have F2808 and F28335, of which F28335 operates at 150Mhz.. The results for F28335 is 9.40MHz.....!!!

So none in C2000 satisfy your condition. BTW why (for what) do you want such a feature ???

Also can you explain:

i would like to generate pulse wave signal 50% duty cycle. So it can be on/off gpio mode not a PWM

PWM pulse can also generate 50% duty cycle!

Regards,

Gautam

Hello Gautam,

and thanks for the quick help.I know that i can generate with the PWM a 50% d. cycle but i thought, it s impossible to get the 13MHz with the PWM.

the purpose is: i would like to generate a 13Mhz signal. i need it for a impedance measurement between 5 MHz and 13MHz and i thought, i can make a frequency sweep in this domain and i can measure the max impedance for my setup with the mc. 

but i didnt find a mc which can be the right for me. So it can be other kind of mc not necessary c2000. 

best regards 

Aymen

Aymen, this is C2000 forum and I too work on MSP430 and C2000 controllers. So, I guess that's all help you can get here. Maybe you can switch to TI ARM forums for further help. Also, if possible you can wait for another day wherein a TI buddy of mine can shed some light.

Regards,

Gautam

Thanks Gautam,

i hope i will find a better solution. 

best regards,

Aymen