From ac4fd8e8340886f455add8cf92ee1c8458b8ae19 Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Sun, 16 Mar 2014 14:31:22 +0200 Subject: Add ek-tm4c1294xl example projects --- boards/ek-tm4c1294xl/uart_echo/uart_echo.c | 205 +++++++++++++++++++++++++++++ 1 file changed, 205 insertions(+) create mode 100644 boards/ek-tm4c1294xl/uart_echo/uart_echo.c (limited to 'boards/ek-tm4c1294xl/uart_echo/uart_echo.c') diff --git a/boards/ek-tm4c1294xl/uart_echo/uart_echo.c b/boards/ek-tm4c1294xl/uart_echo/uart_echo.c new file mode 100644 index 0000000..406429c --- /dev/null +++ b/boards/ek-tm4c1294xl/uart_echo/uart_echo.c @@ -0,0 +1,205 @@ +//***************************************************************************** +// +// uart_echo.c - Example for reading data from and writing data to the UART in +// an interrupt driven fashion. +// +// Copyright (c) 2013-2014 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 2.1.0.12573 of the EK-TM4C1294XL Firmware Package. +// +//***************************************************************************** + +#include +#include +#include "inc/hw_ints.h" +#include "inc/hw_memmap.h" +#include "driverlib/debug.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/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. +// +//***************************************************************************** + +//**************************************************************************** +// +// System clock rate in Hz. +// +//**************************************************************************** +uint32_t g_ui32SysClock; + +//***************************************************************************** +// +// The error routine that is called if the driver library encounters an error. +// +//***************************************************************************** +#ifdef DEBUG +void +__error__(char *pcFilename, uint32_t ui32Line) +{ +} +#endif + +//***************************************************************************** +// +// The UART interrupt handler. +// +//***************************************************************************** +void +UARTIntHandler(void) +{ + uint32_t ui32Status; + + // + // Get the interrrupt status. + // + ui32Status = ROM_UARTIntStatus(UART0_BASE, true); + + // + // Clear the asserted interrupts. + // + ROM_UARTIntClear(UART0_BASE, ui32Status); + + // + // 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_PORTN_BASE, GPIO_PIN_0, GPIO_PIN_0); + + // + // Delay for 1 millisecond. Each SysCtlDelay is about 3 clocks. + // + SysCtlDelay(g_ui32SysClock / (1000 * 3)); + + // + // Turn off the LED + // + GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, 0); + } +} + +//***************************************************************************** +// +// Send a string to the UART. +// +//***************************************************************************** +void +UARTSend(const uint8_t *pui8Buffer, uint32_t ui32Count) +{ + // + // Loop while there are more characters to send. + // + while(ui32Count--) + { + // + // Write the next character to the UART. + // + ROM_UARTCharPutNonBlocking(UART0_BASE, *pui8Buffer++); + } +} + +//***************************************************************************** +// +// This example demonstrates how to send a string of data to the UART. +// +//***************************************************************************** +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); + // + // Enable the GPIO port that is used for the on-board LED. + // + ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION); + + // + // Enable the GPIO pins for the LED (PN0). + // + ROM_GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE, GPIO_PIN_0); + + // + // 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, g_ui32SysClock, 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((uint8_t *)"\033[2JEnter text: ", 16); + + // + // Loop forever echoing data through the UART. + // + while(1) + { + } +} -- cgit v1.3.1