//
// $Id: leds.c 328 2008-11-09 05:00:23Z jcw $
// $Revision: 328 $
// $Author: jcw $
// $Date: 2008-11-09 00:00:23 -0500 (Sun, 09 Nov 2008) $
// $HeadURL: http://tinymicros.com/svn_public/arm/lpc2148_demo/trunk/leds/leds.c $
//
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "../main.h"
#include "../cpu/cpu.h"
#include "leds.h"
//
// If CFG_LED is not defined, we still compile the code, it's just not included.
// Define TASKHANDLE_LED so we compile. Normally this is defined in main.h,
// but it's #ifndef'ed out so that we don't allocate a task handle slot for it
// when LED support isn't included.
//
#ifndef CFG_LED
#define TASKHANDLE_LED 0
#endif
//
//
//
typedef struct
{
int timeOn;
int timeOff;
}
ledDutyCycles_t;
static ledDutyCycles_t ledDutyCycles [] =
{
{ (200 / portTICK_RATE_MS), (800 / portTICK_RATE_MS) },
{ (400 / portTICK_RATE_MS), (600 / portTICK_RATE_MS) },
{ (600 / portTICK_RATE_MS), (400 / portTICK_RATE_MS) },
{ (800 / portTICK_RATE_MS), (200 / portTICK_RATE_MS) },
};
static xQueueHandle xLEDQueue = NULL;
//
//
//
void ledsInit (void)
{
GPIO0_FIODIR |= (GPIO_IO_P10 | GPIO_IO_P11);
GPIO0_FIOSET = (GPIO_IO_P10 | GPIO_IO_P11);
}
void ledsLED1On (void)
{
GPIO0_FIOCLR = GPIO_IO_P10;
}
void ledsLED1Off (void)
{
GPIO0_FIOSET = GPIO_IO_P10;
}
//
//
//
portBASE_TYPE ledsSetDutyCycle (int adcValue)
{
if (!xLEDQueue)
return pdFALSE;
return xQueueSend (xLEDQueue, &adcValue, (portTickType) 0);
}
//
//
//
static portTASK_FUNCTION (vLEDFlashTask, pvParameters __attribute__ ((unused)))
{
portTickType ledTimeOn = 1;
portTickType ledTimeOff = 1;
portTickType lastTickTime;
int dutyCycle = 0;
//
// Create the queue, turn on LED and die if we can't
//
if (!xLEDQueue)
{
if ((xLEDQueue = xQueueCreate (1, sizeof (dutyCycle))) == 0)
{
ledsLED1On ();
while (1)
vTaskDelay (100);
}
}
//
// Send ourselves a message to init the flash time
//
xQueueSend (xLEDQueue, &dutyCycle, (portTickType) 0);
//
// We need to initialise lastTickTime prior to the first call to vTaskDelayUntil()
//
lastTickTime = xTaskGetTickCount ();
for (;;)
{
vTaskDelayUntil (&lastTickTime, ledTimeOn);
ledsLED1Off ();
vTaskDelayUntil (&lastTickTime, ledTimeOff);
ledsLED1On ();
if (xQueueReceive (xLEDQueue, &dutyCycle, (portTickType) 0))
{
dutyCycle %= arrsizeof (ledDutyCycles);
ledTimeOn = ledDutyCycles [dutyCycle].timeOn;
ledTimeOff = ledDutyCycles [dutyCycle].timeOff;
}
}
}
//
//
//
signed portBASE_TYPE ledsTaskStart (void)
{
return xTaskCreate (vLEDFlashTask, (const signed portCHAR * const) "LED1", configMINIMAL_STACK_SIZE, NULL, (tskIDLE_PRIORITY + 2), &taskHandles [TASKHANDLE_LED]);
}
signed portBASE_TYPE ledsTaskStop (void)
{
if (!taskHandles [TASKHANDLE_LED])
return 0;
vTaskDelete (taskHandles [TASKHANDLE_LED]);
taskHandles [TASKHANDLE_LED] = NULL;
ledsLED1Off ();
return 1;
}
