Basic Hello LED Matrix Example

Displays the text Hello World! on an LED Matrix.

• SDK directory: apps/basic/hello_led_matrix
• Zentri App Store: ZENTRI-BAHELLOLED

API Features Demonstrated

• LED Matrix 8x8 Library
  • led_matrix8x8_deinit
  • led_matrix8x8_init
  • led_matrix8x8_set_blink_rate
  • led_matrix8x8_set_brightness
  • led_matrix8x8_set_scroll_rate
  • led_matrix8x8_set_text

Platforms

This app works on:

• AMW004 - Zentri Mackerel evaluation board. See Connecting a Zentri AMW004 to a Zentri ASG001 Backpack
• AMW106 - Zentri Moray evaluation board

Requirements and Prerequisites

Requires a ZentriOS evaluation board and an Adafruit 8x8 LED Matrix, such as provided with the Zentri ASG001 Monitor Backpack.

Description

This example demonstrates usage of the ZentriOS LED Matrix 8x8 Library. The text "Hello World!" is scrolled across the LED matrix.

Usage Instructions

On building, downloading and running, the app displays:

> Starting 'Hello World - LED Matrix' App

The text scrolls across the display without further interaction.

Implementation

zn_app_init

• led_matrix8x8_init initializes the display

• You can experiment with the parameters of the other functions:

  • led_matrix8x8_set_text - allocate text memory and set text value
  • led_matrix8x8_set_blink_rate - 0 no blink, 3 slow blink
  • led_matrix8x8_set_brightness - 15 is maximum
  • led_matrix8x8_set_scroll_rate - 80 ms is readable, 20 ms is four times faste

Source

See:

• main.c