leds.rar_LPC2141_LPC2142_LPC2146 程序_LPC2148 LED_lpc2148

// // $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; }