Descripción del programa
El programa mostrado a continuación, permite coordinar tres tareas, las cuales iluminan el LED RGB en Azul, Rojo y Verde, utilizando los comandos _mutex_init(), _mutex_lock() y _mutex_unlock().Código
#include <stdio.h>
#include <mqx.h>
#include <bsp.h>
#include"mutex.h"
/* Task IDs */
/* Task IDs */
#define INIT_TASK 5
#define RED_TASK 6
#define GREEN_TASK 7
#define BLUE_TASK 8
extern void init_task(uint32_t);
extern void red_task(uint32_t);
extern void green_task(uint32_t);
extern void blue_task(uint32_t);
MUTEX_STRUCT mutex; //Sedeclaraunaestructuramutex
TD_STRUCT_PTR red_ptr, green_ptr, blue_ptr;
const TASK_TEMPLATE_STRUCT MQX_template_list[] =
{
/* Task Index, Function, Stack, Priority, Name, Attributes, Param, Time Slice */
{ INIT_TASK, init_task, 700, 9, "init", MQX_AUTO_START_TASK, 0, 0 },
{ RED_TASK, red_task, 700, 8, "red", 0, 0, 0 },
{ GREEN_TASK, green_task, 700, 8, "green", 0, 0, 0 },
{ BLUE_TASK, blue_task, 700, 8, "blue", 0, 0, 0 },
{ 0 }
};
void init_task
(
uint32_t initial_data
)
{
int counter = 0;
_task_id red_task_id, green_task_id,blue_task_id;
GPIO_DRV_Init(switchPins,ledPins);
red_task_id = _task_create(0, RED_TASK, 0);
if (red_task_id == MQX_NULL_TASK_ID) {
printf ("\n Could not create red_task\n");
}
green_task_id = _task_create(0, GREEN_TASK, 0);
if (green_task_id == MQX_NULL_TASK_ID) {
printf ("\n Could not create green_task\n");
}
blue_task_id = _task_create(0, BLUE_TASK, 0);
if (blue_task_id == MQX_NULL_TASK_ID) {
printf ("\n Could not create blue_task\n");
}
_mutex_init(&mutex, NULL); //Seinicializamutexconlosvalorespredeterminados
_task_abort(_task_get_id()); //Seterminalatarea
while(1) {
counter++;
}
}
void red_task
(
uint32_t initial_data
)
{
int counter = 0;
while(1){
printf("\n Rojo\n");
counter++;
_mutex_lock(&mutex); //Sebloquea el recurso
GPIO_DRV_ClearPinOutput(BOARD_GPIO_LED_RED);
GPIO_DRV_SetPinOutput(BOARD_GPIO_LED_GREEN);
GPIO_DRV_SetPinOutput(BOARD_GPIO_LED_BLUE);
_time_delay_ticks(100);
_mutex_unlock(&mutex);
}
}
void green_task
(
uint32_t initial_data
)
{
int counter = 0;
//_task_block();
while(1){
counter++;
_mutex_lock(&mutex);
printf("\n Verde\n");
GPIO_DRV_SetPinOutput(BOARD_GPIO_LED_RED);
GPIO_DRV_ClearPinOutput(BOARD_GPIO_LED_GREEN);
GPIO_DRV_SetPinOutput(BOARD_GPIO_LED_BLUE);
_time_delay_ticks(100);
_mutex_unlock(&mutex);
}
}
void blue_task
(
uint32_t initial_data
)
{
int counter = 0;
//_task_block();
while(1){
counter++;
_mutex_lock(&mutex);
printf("\n Azul\n");
GPIO_DRV_SetPinOutput(BOARD_GPIO_LED_RED);
GPIO_DRV_SetPinOutput(BOARD_GPIO_LED_GREEN);
GPIO_DRV_ClearPinOutput(BOARD_GPIO_LED_BLUE);
_time_delay_ticks(100);
_mutex_unlock(&mutex);
}
}
/* EOF */
Referencias
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