How to solve undefined identifier error in example code

sivaprasad sm

Other Parts Discussed in Thread: TM4C1294NCPDT, TM4C123GH6PM

Hai,

Iam working with Tivaware and Tiva lab workshop, i copied the sample code and added the required files(driverlib.lib, startup_rvmdk.s and uart0.c) to the Keil project environment,code is

#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"

int main(void) {

SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));

UARTCharPut(UART0_BASE, 'E');
UARTCharPut(UART0_BASE, 'n');
UARTCharPut(UART0_BASE, 't');
UARTCharPut(UART0_BASE, 'e');
UARTCharPut(UART0_BASE, 'r');
UARTCharPut(UART0_BASE, ' ');
UARTCharPut(UART0_BASE, 'T');
UARTCharPut(UART0_BASE, 'e');
UARTCharPut(UART0_BASE, 'x');
UARTCharPut(UART0_BASE, 't');
UARTCharPut(UART0_BASE, ':');
UARTCharPut(UART0_BASE, ' ');

while (1)
{
if (UARTCharsAvail(UART0_BASE)) UARTCharPut(UART0_BASE, UARTCharGet(UART0_BASE));
}

}

it shows 2 errors

uart0.c(17): error: #20: identifier "GPIO_PA0_U0RX" is undefined
uart0.c(18): error: #20: identifier "GPIO_PA1_U0TX" is undefined

but the code is working well with out these GPIOPinConfigure(GPIO_PA0_U0RX); GPIOPinConfigure(GPIO_PA1_U0TX); functions,but when i change the other function parameters to use the rest of the UART1,2,3... modules. it does not work...no transmission no reception.my project have to use multiple UART modules.

Please kindly help me to solve the problem...

Thank you

over 11 years ago

0 Petrei over 11 years ago

Guru 26105 points

Hi,

You need to add these parameters in Predefined Symbols tab, Compiler Advanced options:

DEBUG
CLASS_IS_TM4C129 // or CLASS_IS_TM4C123 if your micro is in this category
PART_TM4C1294NCPDT // or PART_TM4C123GH6PM or whatever is your micro
ccs="ccs"

These are further used by the file pin_map.h. GPIO_PA0_U0RX and GPIO_PA1_U0TX are apparently not needed because the UART0 is enabled by default.

Petrei

0 sivaprasad sm over 11 years ago in reply to Petrei

Intellectual 520 points

Thank you Petrei for the quick response,

I have to use UART1,2,3...please let me know, where and how i can add those parameters in Predefined Symbols tab, Compiler Advanced options:... iam using Keil..

0 Petrei over 11 years ago in reply to sivaprasad sm

Guru 26105 points

Hi,

Sorry, did not read you use Keil - should be in Compiler Options/Settings, search for them. Also you can import a TI ready-made project from Tiva and see/search all copiler/linker/debugger options - this is your tool, you must inspect it and know everything about, it is not difficult. In this case the last line instead ccs="ccd" write simply rmvdk.

Petrei

0 sivaprasad sm over 11 years ago in reply to Petrei

Intellectual 520 points

Hi Petrei,

ya got it....Thank you very much...kindly receive my gratitude to you...

0 Haresh G over 11 years ago in reply to sivaprasad sm

Intellectual 685 points

Hi,

Past the lines below ur header file.

#define GPIO_PA0_U0RX 0x00000001

#define GPIO_PA1_U0TX 0x00000401

0 Amit Ashara over 11 years ago in reply to Haresh G

TI__Guru**** 244440 points

Hello Haresh

Petrei's solution to the problem is the correct approach. While your solution will get rid of the issue, but during a change or re-port it would break the application (if changes do happen)

Regards

Amit

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How to solve undefined identifier error in example code