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/uart_echo/uart_echo.c | 206 ++++++++++++++++++++++++++++++ 1 file changed, 206 insertions(+) create mode 100644 boards/ek-lm4f120xl/uart_echo/uart_echo.c (limited to 'boards/ek-lm4f120xl/uart_echo/uart_echo.c') diff --git a/boards/ek-lm4f120xl/uart_echo/uart_echo.c b/boards/ek-lm4f120xl/uart_echo/uart_echo.c new file mode 100644 index 0000000..f9527a2 --- /dev/null +++ b/boards/ek-lm4f120xl/uart_echo/uart_echo.c @@ -0,0 +1,206 @@ +//***************************************************************************** +// +// 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 +//!

UART Echo (uart_echo)

+//! +//! 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) + { + } +} -- cgit v1.3.1