LED library

Macros
#define	NUM_LED_COLORS   3 /* # colors per color LED (RGB) */
#define	NUM_LEDS   (NUM_GREEN_LEDS + NUM_COLOR_LEDS)
#define	LED_OFF   0
#define	LED_ON   255

Enumerations
enum	green_led_index_t {   LED0 , LED1 , LED2 , LED3 ,   NUM_GREEN_LEDS }
enum	color_led_index_t { COLOR_LED0 , COLOR_LED1 , NUM_COLOR_LEDS }

Functions
void	leds_init_onoff (void)
void	green_leds_init_pwm (void)
void	color_leds_init_pwm (void)
void	leds_destroy (void)
void	green_led_onoff (const int led, const int onoff)
void	green_led_on (const int led)
void	green_led_off (const int led)
void	color_led_red_onoff (const int onoff)
void	color_led_green_onoff (const int onoff)
void	color_led_blue_onoff (const int onoff)
void	color_led_onoff (const int red_onoff, const int green_onoff, const int blue_onoff)
void	color_led_on (void)
void	color_led_off (void)

Detailed Description

Wrappers to simplify the use of LEDs.

• Green LEDs are numbered 0 to NUM_GREEN_LEDS-1.
• Only color LED 0 is used.
• The color LED has three components R, G, B that can be set independently to mix to a color.

LEDs can be used in three modes:

1. on/off mode for all green LEDs and all color LEDs
2. PWM mode for green LEDs (PWM0..PWM3 are rounted to green LEDs 0..3)
3. PWM mode for color LED 0 (PWM0..PWM3 are routed to color LED 0)

An example of how to use this library.

#include <libpynq.h>
int main (void)
{
  // initialise all I/O
  gpio_reset();
  leds_init_onoff();
 
  for (int led = 0; led < NUM_GREEN_LEDS; led++)
    green_led_on(led);
  sleep_msec(500);
  for (int led = 0; led < NUM_GREEN_LEDS; led++)
    green_led_off(led);
 
  // clean up after use
  leds_destroy(); // switches all leds off
  pynq_destroy();
  return EXIT_SUCCESS;
}

LEDs can also be used through GPIO (see gpio.h and pinmap.h). Note that GPIO numbering (IO_LD0..IO_LD3) is then used instead of 0..NUM_GREEN_LEDS-1 (LED0..LED3). In the PWM mode for color LED 0, SWB_PWM0..SWB_PWM3 are routed to color LED 0 (GPIO IO_LD4R, IO_LD4G, IO_LD4B).

Macro Definition Documentation

LED_OFF

#define LED_OFF   0

Definition at line 102 of file leds.h.

LED_ON

#define LED_ON   255

Definition at line 103 of file leds.h.

NUM_LED_COLORS

#define NUM_LED_COLORS   3 /* # colors per color LED (RGB) */

Definition at line 100 of file leds.h.

NUM_LEDS

#define NUM_LEDS   (NUM_GREEN_LEDS + NUM_COLOR_LEDS)

Definition at line 101 of file leds.h.

Enumeration Type Documentation

color_led_index_t

enum color_led_index_t

Enum of color LEDs. Functions for color LEDs use a led number from 0..NUM_COLOR_LEDS-1. Alternatively, you can use COLOR_LEDi instead of just i if you find that clearer.

Enumerator
COLOR_LED0
COLOR_LED1
NUM_COLOR_LEDS

Definition at line 94 of file leds.h.

green_led_index_t

enum green_led_index_t

Enum of green LEDs. Functions for green LEDs use a led number from 0..NUM_GREEN_LEDS-1. Alternatively, you can use LEDi instead of just i if you find that clearer.

Enumerator
LED0
LED1
LED2
LED3
NUM_GREEN_LEDS

Definition at line 80 of file leds.h.

Function Documentation

color_led_blue_onoff()

void color_led_blue_onoff ( const int  onoff )

extern

Switches on/off the blue component of color LED 0.

Parameters

onoff

If the LEDs are in onoff mode then onoff must be either LED_ON or LED_OFF. If the LEDs are in one of the PWM modes then onoff must be 0.255.

Warning

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 195 of file leds.c.

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color_led_green_onoff()

void color_led_green_onoff ( const int  onoff )

extern

Switches on/off the green component of color LED 0.

Parameters

onoff

If the LEDs are in onoff mode then onoff must be either LED_ON or LED_OFF. If the LEDs are in one of the PWM modes then onoff must be 0.255.

Warning

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 172 of file leds.c.

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color_led_off()

void color_led_off ( void  )

extern

Set color LED 0 to black. Same as color_led_onoff(LED_OFF, LED_OFF, LED_OFF).

Warning

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 226 of file leds.c.

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color_led_on()

void color_led_on ( void  )

extern

Set color LED 0 to white. Same as color_led_onoff(LED_ON, LED_ON, LED_ON).

Warning

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 225 of file leds.c.

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color_led_onoff()

void color_led_onoff ( const int  red_onoff, const int  green_onoff, const int  blue_onoff  )

extern

Switches on/off the red/green/blue components of color LED 0.

Parameters

onoff

If the LEDs are in onoff mode then *_onoff must be either LED_ON or LED_OFF. If the LEDs are in one of the PWM modes then *_onoff must be 0.255.

Warning

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 218 of file leds.c.

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color_led_red_onoff()

void color_led_red_onoff ( const int  onoff )

extern

Switches on/off the red component of color LED 0.

Parameters

onoff

If the LEDs are in onoff mode then onoff must be either LED_ON or LED_OFF. If the LEDs are in one of the PWM modes then onoff must be 0.255.

Warning

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 148 of file leds.c.

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color_leds_init_pwm()

void color_leds_init_pwm ( void  )

extern

Initialize the color LEDs for use with variable intensity. The LED intensity can range from 0.255.

Warning

Fails with program exit when LEDs have already been to another mode.

Definition at line 79 of file leds.c.

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green_led_off()

void green_led_off ( const int  led )

extern

Same as green_led_onoff(led, LED_OFF). Works in all modes.

Parameters

led	The green LED.

Warning

Fails with program exit when led is outside valid range.

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 147 of file leds.c.

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green_led_on()

void green_led_on ( const int  led )

extern

Same as green_led_onoff(led, LED_ON). Works in all modes.

Parameters

led	The green LED.

Warning

Fails with program exit when led is outside valid range.

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 146 of file leds.c.

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green_led_onoff()

void green_led_onoff ( const int  led, const int  onoff  )

extern

Parameters

led	The green LED.
onoff	If the LEDs are in onoff mode then onoff must be either LED_ON or LED_OFF. If the LEDs are in one of the PWM modes then onoff must be 0.255.

Warning

Fails with program exit when led is outside valid range.

Fails with program exit when LEDs were not initialized with the correct mode.

Definition at line 117 of file leds.c.

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green_leds_init_pwm()

void green_leds_init_pwm ( void  )

extern

Initialize the green LEDs for use with variable intensity. The LED intensity can range from 0.255.

Warning

Fails with program exit when LEDs have already been to another mode.

Definition at line 58 of file leds.c.

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leds_destroy()

void leds_destroy ( void  )

extern

Unitialize the LEDs, such that the mode of the LEDs can be changed. Switch all lEDs off.

Definition at line 96 of file leds.c.

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leds_init_onoff()

void leds_init_onoff ( void  )

extern

Initialize the green LEDs for on/off use.

Warning

Fails with program exit when LEDs have already been to another mode.

Definition at line 37 of file leds.c.

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