From e018ceebed74b8223482bc9d1ed0b31c938381da Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Mon, 29 Oct 2012 23:04:19 +0200 Subject: New example files --- boards/ek-lm4f120xl/timers/timers.c | 221 ++++++++++++++++++++++++++++++++++++ 1 file changed, 221 insertions(+) create mode 100644 boards/ek-lm4f120xl/timers/timers.c (limited to 'boards/ek-lm4f120xl/timers/timers.c') diff --git a/boards/ek-lm4f120xl/timers/timers.c b/boards/ek-lm4f120xl/timers/timers.c new file mode 100644 index 0000000..6aad202 --- /dev/null +++ b/boards/ek-lm4f120xl/timers/timers.c @@ -0,0 +1,221 @@ +//***************************************************************************** +// +// timers.c - Timers 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_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/sysctl.h" +#include "driverlib/timer.h" +#include "utils/uartstdio.h" + +//***************************************************************************** +// +//! \addtogroup example_list +//!

Timer (timers)

+//! +//! 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 on the display. +//! +//! UART0, connected to the Stellaris Virtual Serial Port and running at 115,200, +//! 8-N-1, is used to display messages from this application. +// +//***************************************************************************** + + +//***************************************************************************** +// +// Flags that contain the current value of the interrupt indicator as displayed +// on the UART. +// +//***************************************************************************** +unsigned long g_ulFlags; + +//***************************************************************************** +// +// The error routine that is called if the driver library encounters an error. +// +//***************************************************************************** +#ifdef DEBUG +void +__error__(char *pcFilename, unsigned long ulLine) +{ +} +#endif + +//***************************************************************************** +// +// The interrupt handler for the first timer interrupt. +// +//***************************************************************************** +void +Timer0IntHandler(void) +{ + // + // Clear the timer interrupt. + // + ROM_TimerIntClear(TIMER0_BASE, TIMER_TIMA_TIMEOUT); + + // + // Toggle the flag for the first timer. + // + HWREGBITW(&g_ulFlags, 0) ^= 1; + + // + // Use the flags to Toggle the LED for this timer + // + GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_1, g_ulFlags << 1); + + // + // Update the interrupt status on the display. + // + ROM_IntMasterDisable(); + UARTprintf("\rT1: %d T2: %d", HWREGBITW(&g_ulFlags, 0) ? 1 : 0, + HWREGBITW(&g_ulFlags, 1) ? 1 : 0); + ROM_IntMasterEnable(); +} + +//***************************************************************************** +// +// The interrupt handler for the second timer interrupt. +// +//***************************************************************************** +void +Timer1IntHandler(void) +{ + // + // Clear the timer interrupt. + // + ROM_TimerIntClear(TIMER1_BASE, TIMER_TIMA_TIMEOUT); + + // + // Toggle the flag for the second timer. + // + HWREGBITW(&g_ulFlags, 1) ^= 1; + + // + // Use the flags to Toggle the LED for this timer + // + GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, g_ulFlags << 1); + + // + // Update the interrupt status on the display. + // + ROM_IntMasterDisable(); + UARTprintf("\rT1: %d T2: %d", HWREGBITW(&g_ulFlags, 0) ? 1 : 0, + HWREGBITW(&g_ulFlags, 1) ? 1 : 0); + ROM_IntMasterEnable(); +} + +//***************************************************************************** +// +// This example application demonstrates the use of the timers to generate +// periodic interrupts. +// +//***************************************************************************** +int +main(void) +{ + // + // 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_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | + SYSCTL_XTAL_16MHZ); + + // + // Initialize the UART and write status. + // + ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA); + GPIOPinConfigure(GPIO_PA0_U0RX); + GPIOPinConfigure(GPIO_PA1_U0TX); + ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1); + UARTStdioInit(0); + UARTprintf("\033[2JTimers example\n"); + UARTprintf("T1: 0 T2: 0"); + + // + // Enable the GPIO port that is used for the on-board LED. + // + ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF); + + // + // Enable the GPIO pins for the LED (PF1 & PF2). + // + ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2 | 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, ROM_SysCtlClockGet()); + ROM_TimerLoadSet(TIMER1_BASE, TIMER_A, ROM_SysCtlClockGet() / 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) + { + } +} -- cgit v1.3.1