c8x8r  2.0.0.0
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8x8 R click

8x8 R click is a 64 LED matrix display Click boardâ„¢, composed of SMD LEDs organized in 8 rows by 8 columns. It has a digital brightness control in 16 steps, it can control every LED in the display matrix independently, it blanks the display on power up to eliminate glitches and it requires a single resistor to control the current through all the LEDs at once, which simplifies the design. 8x8 R click uses a fast SPI communication protocol, allowing fast display response and no lag.8x8 R Click is an add-on board in mikroBUS form factor.

click Product page


Click library

  • Author : Stefan Ilic
  • Date : Jun 2021.
  • Type : SPI type

Software Support

We provide a library for the 8x8R Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for 8x8R Click driver.

Standard key functions :

Example key functions :

  • c8x8r_write_cmd This function writes a desired number of data bytes starting from the selected register by using SPI serial interface.
    void c8x8r_write_cmd ( c8x8r_t *ctx, uint8_t cmd, uint8_t tx_data );
  • c8x8r_display_refresh The function switches off all LEDs.
  • c8x8r_display_byte This function displayes one character to the display.
    void c8x8r_display_byte ( c8x8r_t *ctx, char tx_byte );

Example Description

This demo example shows a drawing of Image, new create string and character on the screen.

The demo application is composed of two sections :

Application Init

Configuring clicks and log objects. Settings the click in the default configuration.

void application_init ( void ) {
log_cfg_t log_cfg;
c8x8r_cfg_t c8x8r_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
c8x8r_cfg_setup( &c8x8r_cfg );
C8X8R_MAP_MIKROBUS( c8x8r_cfg, MIKROBUS_1 );
err_t init_flag = c8x8r_init( &c8x8r, &c8x8r_cfg );
if ( init_flag == SPI_MASTER_ERROR ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
c8x8r_default_cfg ( &c8x8r );
log_info( &logger, " Application Task " );
Delay_1sec( );
}

Application Task

Shows one byte, then scrolls the string and image, every 1 sec.

void application_task ( void ) {
Delay_ms( 1000 );
Delay_ms( 1000 );
c8x8r_display_image( &c8x8r, &demo_img_on[ 0 ] );
Delay_ms( 500 );
Delay_ms( 1000 );
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.8x8R

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.


c8x8r_default_cfg
void c8x8r_default_cfg(c8x8r_t *ctx)
8x8 R default configuration function.
c8x8r_init
err_t c8x8r_init(c8x8r_t *ctx, c8x8r_cfg_t *cfg)
8x8 R initialization function.
c8x8r_display_refresh
void c8x8r_display_refresh(c8x8r_t *ctx)
8x8 R function for refresh display.
demo_string
uint8_t demo_string[11]
Definition: main.c:28
c8x8r_display_byte
void c8x8r_display_byte(c8x8r_t *ctx, char tx_byte)
8x8 R function for displaying one character.
c8x8r_cfg_t
8x8 R Click configuration object.
Definition: c8x8r.h:192
c8x8r_display_string
void c8x8r_display_string(c8x8r_t *ctx, char *p_array)
8x8 R function for displaying scrolling string.
application_task
void application_task(void)
Definition: main.c:67
demo_img_off
uint8_t demo_img_off[8]
Definition: main.c:30
C8X8R_MAP_MIKROBUS
#define C8X8R_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: c8x8r.h:164
c8x8r_write_cmd
void c8x8r_write_cmd(c8x8r_t *ctx, uint8_t cmd, uint8_t tx_data)
8x8 R data writing function.
demo_img_on
uint8_t demo_img_on[8]
Definition: main.c:29
application_init
void application_init(void)
Definition: main.c:33
c8x8r_display_image
void c8x8r_display_image(c8x8r_t *ctx, uint8_t *p_image)
8x8 R function for displaying image.
c8x8r_cfg_setup
void c8x8r_cfg_setup(c8x8r_cfg_t *cfg)
8x8 R configuration object setup function.
demo_char
char demo_char
Definition: main.c:31
c8x8r_t
8x8 R Click context object.
Definition: c8x8r.h:177