UART channel change problem on LM4F120H5QR(Stellaris Launchpad)

ashes35 · Nov 18, 2012

Hi everyone I have some problem with lm4f120 uart channels.I try to change example program but there is nothing on UART channel.I'm giving the original example code and modified code.
Original Code:

Code:

//*****************************************************************************
//
// hello.c - Simple hello world example.
//
// Copyright (c) 2012 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
// 
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
//
//*****************************************************************************

#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "utils/uartstdio.h"

//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>Hello World (hello)</h1>
//!
//! A very simple ``hello world'' example.  It simply displays ``Hello World!''
//! on the UART and is a starting point for more complicated applications.
//!
//! UART0, connected to the Stellaris Virtual Serial Port and running at 
//! 115,200, 8-N-1, is used to display messages from this application.
//
//*****************************************************************************


//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, unsigned long ulLine)
{
}
#endif

//*****************************************************************************
//
// Print "Hello World!" to the UART on the Stellaris evaluation board.
//
//*****************************************************************************
int
main(void)
{
    volatile unsigned long ulLoop;

    //
    // Enable lazy stacking for interrupt handlers.  This allows floating-point
    // instructions to be used within interrupt handlers, but at the expense of
    // extra stack usage.
    //
    ROM_FPULazyStackingEnable();

    //
    // Set the clocking to run directly from the crystal.
    //
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ |
                       SYSCTL_OSC_MAIN);

                       
    //
    // Enable the GPIO port that is used for the on-board LED.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

    //
    // Enable the GPIO pins for the LED (PF2 & PF3).  
    //
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);

                       
    //
    // Initialize the UART.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
    ROM_GPIOPinConfigure(GPIO_PA0_U0RX);
    ROM_GPIOPinConfigure(GPIO_PA1_U0TX);
    ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_6 | GPIO_PIN_7);
    UARTStdioInit(0);

    //
    // Hello!
    //
    UARTprintf("Hello, world!\n");
    
    //
    // We are finished.  Hang around doing nothing.
    //
    while(1)
    {
        //
        // Turn on the BLUE LED.
        //
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

        //
        // Delay for a bit.
        //
        SysCtlDelay(SysCtlClockGet() / 10 / 3);

        //
        // Turn off the BLUE LED.
        //
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);
        
        //
        // Delay for a bit.
        //
        SysCtlDelay(SysCtlClockGet() / 10 / 3);
    }
}

Modified Code

Code:

//*****************************************************************************
//
// hello.c - Simple hello world example.
//
// Copyright (c) 2012 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
// 
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
//
//*****************************************************************************

#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "utils/uartstdio.h"

//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>Hello World (hello)</h1>
//!
//! A very simple ``hello world'' example.  It simply displays ``Hello World!''
//! on the UART and is a starting point for more complicated applications.
//!
//! UART0, connected to the Stellaris Virtual Serial Port and running at 
//! 115,200, 8-N-1, is used to display messages from this application.
//
//*****************************************************************************


//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, unsigned long ulLine)
{
}
#endif

//*****************************************************************************
//
// Print "Hello World!" to the UART on the Stellaris evaluation board.
//
//*****************************************************************************
int
main(void)
{
    volatile unsigned long ulLoop;

    //
    // Enable lazy stacking for interrupt handlers.  This allows floating-point
    // instructions to be used within interrupt handlers, but at the expense of
    // extra stack usage.
    //
    ROM_FPULazyStackingEnable();

    //
    // Set the clocking to run directly from the crystal.
    //
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_XTAL_16MHZ |
                       SYSCTL_OSC_MAIN);

                       
    //
    // Enable the GPIO port that is used for the on-board LED.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

    //
    // Enable the GPIO pins for the LED (PF2 & PF3).  
    //
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);

                       
    //
    // Initialize the UART.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
    ROM_GPIOPinConfigure(GPIO_PD6_U2RX);
    ROM_GPIOPinConfigure(GPIO_PD7_U2TX);
    ROM_GPIOPinTypeUART(GPIO_PORTD_BASE, GPIO_PIN_6 | GPIO_PIN_7);
    UARTStdioInit(0);

    //
    // Hello!
    //
    UARTprintf("Hello, world!\n");
    
    //
    // We are finished.  Hang around doing nothing.
    //
    while(1)
    {
        //
        // Turn on the BLUE LED.
        //
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

        //
        // Delay for a bit.
        //
        SysCtlDelay(SysCtlClockGet() / 10 / 3);

        //
        // Turn off the BLUE LED.
        //
        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);
        
        //
        // Delay for a bit.
        //
        SysCtlDelay(SysCtlClockGet() / 10 / 3);
    }
}

Thanks for attention

.

internetuser2k12 · Nov 18, 2012

What is the problem? Are you using a 16 MHz clock? Is it UARTStdioInit(0); or UARTStdioInit(2); for UART 2?

The prototype is like this UARTStdioInit(unsigned long ulPortNum);

ulPortNum should be 2 for channel 2

ashes35 · Nov 18, 2012

I want to tell my problems step by step here is number one my problem is i can't send one byte to my computer.Generally i'm using TI stellaris launchpad so yes i use 16 MHz clock with PLL and dividers 50 Mhz and i think your problem point is so good advice to solve my problem but doesnt work here is the changed code part
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
ROM_GPIOPinTypeUART(GPIO_PORTD_BASE, GPIO_PIN_6 | GPIO_PIN_7);
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART2);
UARTConfigSetExpClk(UART2_BASE, SysCtlClockGet(), 115200,
(UART_CONFIG_PAR_NONE | UART_CONFIG_STOP_ONE |
UART_CONFIG_WLEN_8));
UARTStdioInit(2);

internetuser2k12 · Nov 18, 2012

Is the original code working? Where did you get that code from?

Check this file page 321 onwards http://www.ti.com/lit/ug/spmu245/spmu245.pdf

ashes35 · Nov 18, 2012

TI StellarisWare library example.I guess they run it.

internetuser2k12 · Nov 18, 2012

see the pdf in my last post. see page number 231 and onwards.

ashes35 · Nov 18, 2012

i already have used this:**broken link removed** this hasn't got ROM extension.Do you think that might be my problem ?I change code with ROM extension no data on the channel again.Here is the changed code part.
// // Initialize the UART.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
ROM_GPIOPinTypeUART(GPIO_PORTD_BASE, GPIO_PIN_6 | GPIO_PIN_7);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART2);
ROM_UARTConfigSetExpClk(UART2_BASE, SysCtlClockGet(), 115200,
(UART_CONFIG_PAR_NONE | UART_CONFIG_STOP_ONE |
UART_CONFIG_WLEN_8));
UARTEnable(UART2_BASE);
UARTStdioInit(2);

internetuser2k12 · Nov 18, 2012

Caqn you zip and post the examples folder of stellaris? and mention which example you are using. Should I install SW-LM3S-9453.exe to compile the code? Is that the compiler? Are you sure the functions you are using are for LM4F120H5QR? Is there any jumper setting on your Stellaris Launchpad to set the UART lines?

Did you see this page no 12 http://www.ti.com/lit/ug/spmu289/spmu289.pdf Have you configures jumper 4 properly?

ashes35 · Nov 18, 2012

IDE is Keil and library isn't LM3S-9453.exe the library is SW-EK-LM4F120XL-945.exe and example's name is hello

internetuser2k12 · Nov 18, 2012

Where can I download SW-EK-LM4F120XL-945.exe? Is it free?

Here http://www.ti.com/tool/sw-ek-lm4f120xl which one should I download?

ashes35 · Nov 18, 2012

https://www.ti.com/tool/sw-ek-lm4f120xl download link.
Yes it is completely free.

internetuser2k12 · Nov 18, 2012

See my last post and tell which one of the 5 files should I download? Is it the keil One?

Is it the first one SW-EK-LM4F120XL-9453.exe?

Have you tried the Programming Example on page 433 here http://www.ti.com/lit/ug/spmu019o/spmu019o.pdf

ashes35 · Nov 18, 2012

Which IDE do you use if you use Keil you download EK-LM4F120XL-KEIL.If you don't you must download one of IAR,CCS,Keil.

internetuser2k12 · Nov 18, 2012

I have Keil UVision4. Is the LED in your project binking? Is the problem only with UART?

ashes35 · Nov 18, 2012

internetuser2k12 said:
Caqn you zip and post the examples folder of stellaris? and mention which example you are using. Should I install SW-LM3S-9453.exe to compile the code? Is that the compiler? Are you sure the functions you are using are for LM4F120H5QR? Is there any jumper setting on your Stellaris Launchpad to set the UART lines?

Did you see this page no 12 http://www.ti.com/lit/ug/spmu289/spmu289.pdf Have you configures jumper 4 properly?

There is no jumper on the board.

internetuser2k12 said:
See my last post and tell which one of the 5 files should I download? Is it the keil One?

Is it the first one SW-EK-LM4F120XL-9453.exe?

Have you tried the Programming Example on page 433 here http://www.ti.com/lit/ug/spmu019o/spmu019o.pdf

I tried it yesterday result is fail.Besides PA0 and PA1 pin doesn't exist seperately their pin names TX and RX but i want to use the other channels.
You should download Keil extension file.

internetuser2k12 · Nov 18, 2012

Where is the Keil extension file? I am downloading EK-LM4F120XL-KEIL-733.zip file.

ashes35 · Nov 18, 2012

internetuser2k12 said:
Where is the Keil extension file? I am downloading EK-LM4F120XL-KEIL-733.zip file.

you are on the right way.

internetuser2k12 · Nov 18, 2012

Are you using windows 8?

ashes35 · Nov 18, 2012

No,I'm W7 user.

harishom · Dec 27, 2012

Were you able to fix this issue. I have exactly same problem on LM4F120 launchpad using UART2.

Thanks

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