New example files

1 files changed, 221 insertions, 0 deletions

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

+//! <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 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)

+    {

+    }

+}