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//*****************************************************************************
//
// io.c - I/O routines for the enet_io example application.
//
// Copyright (c) 2007-2014 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 DK-TM4C129X Firmware Package.
//
//*****************************************************************************
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_pwm.h"
#include "inc/hw_types.h"
#include "driverlib/gpio.h"
#include "driverlib/pwm.h"
#include "driverlib/sysctl.h"
#include "driverlib/timer.h"
#include "driverlib/interrupt.h"
#include "driverlib/rom.h"
#include "utils/ustdlib.h"
#include "io.h"
//*****************************************************************************
//
// Hardware connection for the user LED.
//
//*****************************************************************************
#define LED_PORT_BASE GPIO_PORTQ_BASE
#define LED_PIN GPIO_PIN_7
//*****************************************************************************
//
// The system clock speed.
//
//*****************************************************************************
extern uint32_t g_ui32SysClock;
//*****************************************************************************
//
// The current speed of the on-screen animation expressed as a percentage.
//
//*****************************************************************************
volatile unsigned long g_ulAnimSpeed = 10;
//*****************************************************************************
//
// Set the timer used to pace the animation. We scale the timer timeout such
// that a speed of 100% causes the timer to tick once every 4 mS (250Hz).
//
//*****************************************************************************
static void
io_set_timer(unsigned long ulSpeedPercent)
{
unsigned long ulTimeout;
//
// Turn the timer off while we are mucking with it.
//
ROM_TimerDisable(TIMER2_BASE, TIMER_A);
//
// If the speed is non-zero, we reset the timeout. If it is zero, we
// just leave the timer disabled.
//
if(ulSpeedPercent)
{
ulTimeout = g_ui32SysClock / 250;
ulTimeout = (ulTimeout * 100 ) / ulSpeedPercent;
ROM_TimerLoadSet(TIMER2_BASE, TIMER_A, ulTimeout);
ROM_TimerEnable(TIMER2_BASE, TIMER_A);
}
}
//*****************************************************************************
//
// Initialize the IO used in this demo
//
//*****************************************************************************
void
io_init(void)
{
//
// Configure Port F0 for as an output for the status LED.
//
ROM_GPIOPinTypeGPIOOutput(LED_PORT_BASE, LED_PIN);
//
// Initialize LED to OFF (0)
//
ROM_GPIOPinWrite(LED_PORT_BASE, LED_PIN, 0);
//
// Enable the peripherals used by this example.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
//
// Configure the timer used to pace the animation.
//
ROM_TimerConfigure(TIMER2_BASE, TIMER_CFG_PERIODIC);
//
// Setup the interrupts for the timer timeouts.
//
ROM_IntEnable(INT_TIMER2A);
ROM_TimerIntEnable(TIMER2_BASE, TIMER_TIMA_TIMEOUT);
//
// Set the timer for the current animation speed. This enables the
// timer as a side effect.
//
io_set_timer(g_ulAnimSpeed);
}
//*****************************************************************************
//
// Set the status LED on or off.
//
//*****************************************************************************
void
io_set_led(bool bOn)
{
//
// Turn the LED on or off as requested.
//
ROM_GPIOPinWrite(LED_PORT_BASE, LED_PIN, bOn ? LED_PIN : 0);
}
//*****************************************************************************
//
// Return LED state
//
//*****************************************************************************
void
io_get_ledstate(char * pcBuf, int iBufLen)
{
//
// Get the state of the LED
//
if(ROM_GPIOPinRead(LED_PORT_BASE, LED_PIN))
{
usnprintf(pcBuf, iBufLen, "ON");
}
else
{
usnprintf(pcBuf, iBufLen, "OFF");
}
}
//*****************************************************************************
//
// Return LED state as an integer, 1 on, 0 off.
//
//*****************************************************************************
int
io_is_led_on(void)
{
//
// Get the state of the LED
//
if(ROM_GPIOPinRead(LED_PORT_BASE, LED_PIN))
{
return(true);
}
else
{
return(0);
}
}
//*****************************************************************************
//
// Set the speed of the animation shown on the display. In this version, the
// speed is described as a decimal number encoded as an ASCII string.
//
//*****************************************************************************
void
io_set_animation_speed_string(char *pcBuf)
{
unsigned long ulSpeed;
//
// Parse the passed parameter as a decimal number.
//
ulSpeed = 0;
while((*pcBuf >= '0') && (*pcBuf <= '9'))
{
ulSpeed *= 10;
ulSpeed += (*pcBuf - '0');
pcBuf++;
}
//
// If the number is valid, set the new speed.
//
if(ulSpeed <= 100)
{
g_ulAnimSpeed = ulSpeed;
io_set_timer(g_ulAnimSpeed);
}
}
//*****************************************************************************
//
// Set the speed of the animation shown on the display.
//
//*****************************************************************************
void
io_set_animation_speed(unsigned long ulSpeed)
{
//
// If the number is valid, set the new speed.
//
if(ulSpeed <= 100)
{
g_ulAnimSpeed = ulSpeed;
io_set_timer(g_ulAnimSpeed);
}
}
//*****************************************************************************
//
// Get the current animation speed as an ASCII string.
//
//*****************************************************************************
void
io_get_animation_speed_string(char *pcBuf, int iBufLen)
{
usnprintf(pcBuf, iBufLen, "%d%%", g_ulAnimSpeed);
}
//*****************************************************************************
//
// Get the current animation speed as a number.
//
//*****************************************************************************
unsigned long
io_get_animation_speed(void)
{
return(g_ulAnimSpeed);
}
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