uartmux2  2.0.0.0
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UART MUX 2 click

UART MUX 2 Click is a compact add-on board that enables pseudo-multidrop RS232 transmission. This board features the MAX399, a precise CMOS analog multiplexer that allows four remote RS-232 transceivers to share a single UART from Maxim Integrated. It offers fast switching speeds with a transition time of less than 250ns and low on-resistance less than 100Ω while retains CMOS-logic input compatibility and fast switching. Channel selection is performed through a set of specific GPIO pins and possesses additional functionality such as the manual ON/OFF feature.

click Product page


Click library

  • Author : Nenad Filipovic
  • Date : Jan 2021.
  • Type : UART type

Software Support

We provide a library for the UartMux2 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 UartMux2 Click driver.

Standard key functions :

Example key functions :

Example Description

This library contains API for UART MUX 2 Click driver. This example transmits/receives and processes data from UART MUX 2 clicks. The library initializes and defines the UART bus drivers to transmit or receive data.

The demo application is composed of two sections :

Application Init

Initializes driver and set UART channel module.

void application_init ( void ) {
log_cfg_t log_cfg;
uartmux2_cfg_t uartmux2_cfg;
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_printf( &logger, "\r\n Application Init \r\n" );
// Click initialization.
uartmux2_cfg_setup( &uartmux2_cfg );
UARTMUX2_MAP_MIKROBUS( uartmux2_cfg, MIKROBUS_1 );
err_t init_flag = uartmux2_init( &uartmux2, &uartmux2_cfg );
if ( init_flag == UART_ERROR ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
uartmux2_default_cfg ( &uartmux2 );
app_buf_len = 0;
app_buf_cnt = 0;
log_printf( &logger, "\r\n Application Task \r\n" );
log_printf( &logger, "------------------\r\n" );
Delay_ms( 500 );
#ifdef TRANSMITTER
log_printf( &logger, " Send data: \r\n" );
log_printf( &logger, " mikroE \r\n" );
log_printf( &logger, "------------------\r\n" );
log_printf( &logger, " Transmit data \r\n" );
Delay_ms( 1000 );
#endif
#ifdef RECIEVER
uart_ch = UARTMUX2_CHANNEL_0;
log_printf( &logger, " Receive data \r\n" );
log_printf( &logger, " UART%u \r\n", ( uint16_t ) uart_ch );
uartmux2_set_channel( &uartmux2, uart_ch );
Delay_ms( 2000 );
#endif
log_printf( &logger, "------------------\r\n" );
}

Application Task

Transmitter/Receiver task depend on uncommented code. Receiver logging each received byte to the UART for data logging, while transmitted send messages every 2 seconds.

void application_task ( void ) {
#ifdef TRANSMITTER
for ( uart_ch = UARTMUX2_CHANNEL_0; uart_ch <= UARTMUX2_CHANNEL_3; uart_ch++ ) {
uartmux2_set_channel( &uartmux2, uart_ch );
Delay_ms( 100 );
log_printf( &logger, " UART%u : ", ( uint16_t ) uart_ch );
for ( uint8_t cnt = 0; cnt < 9; cnt ++ ) {
log_printf( &logger, "%c", demo_message[ cnt ] );
Delay_ms( 100 );
}
Delay_ms( 2000 );
}
log_printf( &logger, "------------------\r\n" );
Delay_ms( 100 );
#endif
#ifdef RECIEVER
uartmux2_process( );
if ( app_buf_len > 0 ) {
log_printf( &logger, "%s", app_buf );
uartmux2_clear_app_buf( );
}
#endif
}

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.UartMux2

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. UART terminal is available in all Mikroelektronika compilers.


uartmux2_set_operation_mode
err_t uartmux2_set_operation_mode(uartmux2_t *ctx, uint8_t op_mode)
UART MUX 2 set operation mode function.
uartmux2_default_cfg
void uartmux2_default_cfg(uartmux2_t *ctx)
UART MUX 2 default configuration function.
uartmux2_set_channel
err_t uartmux2_set_channel(uartmux2_t *ctx, uint8_t mux_ch)
UART MUX 2 set channel function.
uartmux2_cfg_setup
void uartmux2_cfg_setup(uartmux2_cfg_t *cfg)
UART MUX 2 configuration object setup function.
UARTMUX2_CHANNEL_0
#define UARTMUX2_CHANNEL_0
UART MUX 2 select channel.
Definition: uartmux2.h:139
application_task
void application_task(void)
Definition: main.c:127
UARTMUX2_CHANNEL_3
#define UARTMUX2_CHANNEL_3
Definition: uartmux2.h:142
UARTMUX2_MAP_MIKROBUS
#define UARTMUX2_MAP_MIKROBUS(cfg, mikrobus)
MikroBUS pin mapping.
Definition: uartmux2.h:161
uartmux2_init
err_t uartmux2_init(uartmux2_t *ctx, uartmux2_cfg_t *cfg)
UART MUX 2 initialization function.
uartmux2_t
UART MUX 2 Click context object.
Definition: uartmux2.h:178
application_init
void application_init(void)
Definition: main.c:68
uartmux2_send_data
err_t uartmux2_send_data(uartmux2_t *ctx, char *tx_data)
UART MUX 2 data writing function.
uartmux2_cfg_t
UART MUX 2 Click configuration object.
Definition: uartmux2.h:206
demo_message
unsigned char demo_message[9]
Definition: main.c:46