Tool/software: Code Composer Studio
Hi All,
I am tasked to write a timer based interrupt code (I am a beginner to this). As for a start, I tried compiling the timers.c code provided by TI for TM4c129exl.
However, it seems the timer IntHandlers are not triggered (added few printf lines to debug on this). I wonder do I need to do any jumper settings or rework for this (my jumpers are in default settings).
Attached the terminal output and code:
//*****************************************************************************
//
// timers.c - Timers example.
//
// Copyright (c) 2013-2017 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 2.1.4.178 of the EK-TM4C129EXL Firmware Package.
//
//*****************************************************************************
#include <stdint.h>
#include <stdbool.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
#include "driverlib/sysctl.h"
#include "driverlib/timer.h"
#include "driverlib/uart.h"
#include "utils/uartstdio.h"
//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>Timer (timers)</h1>
//!
//! This example application demonstrates the use of the timers to generate
//! periodic interrupts. One timer is set up to interrupt once per second and
//! the other to interrupt twice per second; each interrupt handler will toggle
//! its own indicator throught the UART.
//!
//! UART0, connected to the Virtual Serial Port and running at 115,200, 8-N-1,
//! is used to display messages from this application.
//
//*****************************************************************************
//****************************************************************************
//
// System clock rate in Hz.
//
//****************************************************************************
uint32_t g_ui32SysClock;
//*****************************************************************************
//
// Flags that contain the current value of the interrupt indicator as displayed
// on the UART.
//
//*****************************************************************************
uint32_t g_ui32Flags;
//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
}
#endif
//*****************************************************************************
//
// The interrupt handler for the first timer interrupt.
//
//*****************************************************************************
void
Timer0IntHandler(void)
{
UARTprintf("DEBUG: Entered timer0\n");
char cOne, cTwo;
//
// Clear the timer interrupt.
//
ROM_TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
//
// Toggle the flag for the first timer.
//
HWREGBITW(&g_ui32Flags, 0) ^= 1;
//
// Use the flags to Toggle the LED for this timer
//
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, g_ui32Flags);
//
// Update the interrupt status.
//
ROM_IntMasterDisable();
cOne = HWREGBITW(&g_ui32Flags, 0) ? '1' : '0';
cTwo = HWREGBITW(&g_ui32Flags, 1) ? '1' : '0';
UARTprintf("\rT1: %c T2: %c", cOne, cTwo);
ROM_IntMasterEnable();
}
//*****************************************************************************
//
// The interrupt handler for the second timer interrupt.
//
//*****************************************************************************
void
Timer1IntHandler(void)
{
UARTprintf("DEBUG: Entered timer1\n");
char cOne, cTwo;
//
// Clear the timer interrupt.
//
ROM_TimerIntClear(TIMER1_BASE, TIMER_TIMA_TIMEOUT);
//
// Toggle the flag for the second timer.
//
HWREGBITW(&g_ui32Flags, 1) ^= 1;
//
// Use the flags to Toggle the LED for this timer
//
GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_1, g_ui32Flags);
//
// Update the interrupt status.
//
ROM_IntMasterDisable();
cOne = HWREGBITW(&g_ui32Flags, 0) ? '1' : '0';
cTwo = HWREGBITW(&g_ui32Flags, 1) ? '1' : '0';
UARTprintf("\rT1: %c T2: %c", cOne, cTwo);
ROM_IntMasterEnable();
}
//*****************************************************************************
//
// Configure the UART and its pins. This must be called before UARTprintf().
//
//*****************************************************************************
void
ConfigureUART(void)
{
//
// Enable the GPIO Peripheral used by the UART.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
//
// Enable UART0.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
//
// Configure GPIO Pins for UART mode.
//
ROM_GPIOPinConfigure(GPIO_PA0_U0RX);
ROM_GPIOPinConfigure(GPIO_PA1_U0TX);
ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
//
// Initialize the UART for console I/O.
//
UARTStdioConfig(0, 115200, g_ui32SysClock);
}
//*****************************************************************************
//
// This example application demonstrates the use of the timers to generate
// periodic interrupts.
//
//*****************************************************************************
int
main(void)
{
//
// Set the clocking to run directly from the crystal at 120MHz.
//
g_ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
SYSCTL_OSC_MAIN |
SYSCTL_USE_PLL |
SYSCTL_CFG_VCO_480), 120000000);
//
// Initialize the UART and write status.
//
ConfigureUART();
UARTprintf("\033[2JTimers example\n");
UARTprintf("T1: 0 T2: 0");
//
// Enable the GPIO port that is used for the on-board LEDs.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);
//
// Enable the GPIO pins for the LEDs (PN0 & PN1).
//
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE, GPIO_PIN_0 | GPIO_PIN_1);
//
// Enable the peripherals used by this example.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
//
// Enable processor interrupts.
//
ROM_IntMasterEnable();
//
// Configure the two 32-bit periodic timers.
//
ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
ROM_TimerConfigure(TIMER1_BASE, TIMER_CFG_PERIODIC);
ROM_TimerLoadSet(TIMER0_BASE, TIMER_A, g_ui32SysClock);
ROM_TimerLoadSet(TIMER1_BASE, TIMER_A, g_ui32SysClock / 2);
//
// Setup the interrupts for the timer timeouts.
//
ROM_IntEnable(INT_TIMER0A);
ROM_IntEnable(INT_TIMER1A);
ROM_TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
ROM_TimerIntEnable(TIMER1_BASE, TIMER_TIMA_TIMEOUT);
//
// Enable the timers.
//
ROM_TimerEnable(TIMER0_BASE, TIMER_A);
ROM_TimerEnable(TIMER1_BASE, TIMER_A);
//
// Loop forever while the timers run.
//
while(1)
{
}
}
