New example files

1 files changed, 206 insertions, 0 deletions

diff --git a/boards/ek-lm4f120xl/uart_echo/uart_echo.c b/boards/ek-lm4f120xl/uart_echo/uart_echo.c
new file mode 100644
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+++ b/boards/ek-lm4f120xl/uart_echo/uart_echo.c
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+//*****************************************************************************

+//

+// uart_echo.c - Example for reading data from and writing data to the UART in

+//               an interrupt driven fashion.

+//

+// 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/uart.h"

+

+//*****************************************************************************

+//

+//! \addtogroup example_list

+//! <h1>UART Echo (uart_echo)</h1>

+//!

+//! This example application utilizes the UART to echo text.  The first UART

+//! (connected to the USB debug virtual serial port on the evaluation board)

+//! will be configured in 115,200 baud, 8-n-1 mode.  All characters received on

+//! the UART are transmitted back to the UART.

+//

+//*****************************************************************************

+

+

+//*****************************************************************************

+//

+// The error routine that is called if the driver library encounters an error.

+//

+//*****************************************************************************

+#ifdef DEBUG

+void

+__error__(char *pcFilename, unsigned long ulLine)

+{

+}

+#endif

+

+//*****************************************************************************

+//

+// The UART interrupt handler.

+//

+//*****************************************************************************

+void

+UARTIntHandler(void)

+{

+    unsigned long ulStatus;

+

+    //

+    // Get the interrrupt status.

+    //

+    ulStatus = ROM_UARTIntStatus(UART0_BASE, true);

+

+    //

+    // Clear the asserted interrupts.

+    //

+    ROM_UARTIntClear(UART0_BASE, ulStatus);

+

+    //

+    // Loop while there are characters in the receive FIFO.

+    //

+    while(ROM_UARTCharsAvail(UART0_BASE))

+    {

+        //

+        // Read the next character from the UART and write it back to the UART.

+        //

+        ROM_UARTCharPutNonBlocking(UART0_BASE,

+                                   ROM_UARTCharGetNonBlocking(UART0_BASE));

+        

+        //

+        // Blink the LED to show a character transfer is occuring.

+        //

+        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

+        

+        //

+        // Delay for 1 millisecond.  Each SysCtlDelay is about 3 clocks.

+        //

+        SysCtlDelay(SysCtlClockGet() / (1000 * 3));

+        

+        //

+        // Turn off the LED

+        //

+        GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);

+        

+    }

+}

+

+//*****************************************************************************

+//

+// Send a string to the UART.

+//

+//*****************************************************************************

+void

+UARTSend(const unsigned char *pucBuffer, unsigned long ulCount)

+{

+    //

+    // Loop while there are more characters to send.

+    //

+    while(ulCount--)

+    {

+        //

+        // Write the next character to the UART.

+        //

+        ROM_UARTCharPutNonBlocking(UART0_BASE, *pucBuffer++);

+    }

+}

+

+//*****************************************************************************

+//

+// This example demonstrates how to send a string of data to the UART.

+//

+//*****************************************************************************

+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_FPUEnable();

+    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);

+

+    //

+    // 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).  

+    //

+    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);

+

+    //

+    // Enable the peripherals used by this example.

+    //

+    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

+    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

+

+    //

+    // Enable processor interrupts.

+    //

+    ROM_IntMasterEnable();

+

+    //

+    // Set GPIO A0 and A1 as UART pins.

+    //

+    GPIOPinConfigure(GPIO_PA0_U0RX);

+    GPIOPinConfigure(GPIO_PA1_U0TX);

+    ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

+

+    //

+    // Configure the UART for 115,200, 8-N-1 operation.

+    //

+    ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 115200,

+                            (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |

+                             UART_CONFIG_PAR_NONE));

+

+    //

+    // Enable the UART interrupt.

+    //

+    ROM_IntEnable(INT_UART0);

+    ROM_UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);

+

+    //

+    // Prompt for text to be entered.

+    //

+    UARTSend((unsigned char *)"\033[2JEnter text: ", 16);

+

+    //

+    // Loop forever echoing data through the UART.

+    //

+    while(1)

+    {

+    }

+}