Application Group

Data Structures
struct	led_blink_s

Macros
#define	BLINK_TASK_STACK_SIZE   (OS_TASK_IDLE_STK_SIZE+0)
#define	YELLOW_FREQ   (2 * MILLI_HZ_PER_HZ)
#define	BLUE_RED_FREQ   (1 * MILLI_HZ_PER_HZ)
#define	RED_START_DELAY   ((BLUE_RED_FREQ * OS_TICKS_PER_SEC) / (2 * MILLI_HZ_PER_HZ))

Typedefs
typedef enum LED_POS_ENUM	led_t
typedef struct led_blink_s	led_data_t

Enumerations
enum	LED_POS_ENUM { RED_LED, GREEN_LED, BLUE_LED, YELLOW_LED }

Functions
void	blink_task (void *ptr)
void	start_blinking (void)
int	main (void)

Variables
static led_data_t	blue_config
static led_data_t	red_config
static led_data_t	yellow_config
static OS_STK	blue_task_stk [BLINK_TASK_STACK_SIZE]
static OS_STK	red_task_stk [BLINK_TASK_STACK_SIZE]
static OS_STK	yellow_task_stk [BLINK_TASK_STACK_SIZE]

Detailed Description

Application which blinks the color LED alternating Red/Blue at 1 Hz and blinks the Yellow LED at 2 Hz.

Macro Definition Documentation

#define BLINK_TASK_STACK_SIZE   (OS_TASK_IDLE_STK_SIZE+0)

Stack size in stk_size elements

Definition at line 25 of file blink_task.c.

#define BLUE_RED_FREQ   (1 * MILLI_HZ_PER_HZ)

Blue/Red LED blinks at 1 Hz

Definition at line 34 of file blink_task.c.

#define RED_START_DELAY   ((BLUE_RED_FREQ * OS_TICKS_PER_SEC) / (2 * MILLI_HZ_PER_HZ))

To get the Red LED to alternate with the Blue LED we delay its start until halfway through the Blue/Red blink cycle.

Definition at line 38 of file blink_task.c.

#define YELLOW_FREQ   (2 * MILLI_HZ_PER_HZ)

Yellow LED blinks at 2 Hz

Definition at line 33 of file blink_task.c.

Typedef Documentation

led_data_t

Structure which defines to blink_task() the LED to blink and the frequency to blink it at. Based on led_blink_s

led_t

Enumerated type that allows generic selection of LEDs on the Launchpad or Boost board by LED color. See LED_POS_ENUM for more information.

Enumeration Type Documentation

enum LED_POS_ENUM

Enumerates the available LEDs.

Enumerator
RED_LED	Red LED of the tri-color LED on the LaunchPad board
GREEN_LED	Green LED of the tri-color LED on the LaunchPad board
BLUE_LED	Blue LED of the tri-color LED on the LaunchPad board
YELLOW_LED	Yellow LED on the Booster Pack board

Definition at line 68 of file blink.h.

Function Documentation

void blink_task

(

void *

parms

)

Task to blink an LED at a given rate param parms is expected to point to a structure of type led_data_t which contains the parameters used by the task. This function assumes that the parameters are in a static structure.

Returns

void

Note

The task is suspended permanently if it cannot figure out which LED it is controlling.

Parameters

parms

Pointer to a structure of led_data_t which contains the parameters used by the task. This function assumes that the parameters are in a static structure

Definition at line 95 of file blink_task.c.

int main

(

void

)

Main program entry point. Responsible for initialization of the hardware and the operating system. Also responsible fore setting up and starting initial tasks.

Returns

int This function should never return.

Definition at line 35 of file startup.c.

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void start_blinking

(

void

)

Function which starts the blink tasks

Returns

void

Note

If there are problems starting a task, this function hangs in a tight loop after detecting the error.

Definition at line 164 of file blink_task.c.

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Variable Documentation

blue_config

static

Initial value:

=
{  
    BLUE_PRIO, BLUE_LED, 0, BLUE_RED_FREQ
}

led_data_t structure defining how the blue led will blink.

Definition at line 53 of file blink_task.c.

blue_task_stk

static

Kernel stack for the blue led instance of blink_task.

Definition at line 81 of file blink_task.c.

red_config

static

Initial value:

=
{  
    RED_PRIO, RED_LED, RED_START_DELAY, BLUE_RED_FREQ
}

led_data_t structure defining how the red led will blink.

Definition at line 58 of file blink_task.c.

red_task_stk

static

Kernel stack for the red counter point led instance of blink_task.

Definition at line 82 of file blink_task.c.

yellow_config

static

Initial value:

=
{  
    YELLOW_PRIO, YELLOW_LED, 0, YELLOW_FREQ
}

led_data_t structure defining how the yellow led will blink.

Definition at line 63 of file blink_task.c.

yellow_task_stk

static

Kernel stack for the yellow led instance of blink_task.

Definition at line 83 of file blink_task.c.