uart1wire

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UART 1-Wire click

UART 1-Wire click is used to convert standard UART or RS232 signals into 1-Wire® signals. Apart from other features such as the slew rate control for larger 1-Wire® busses, selectable data rate, an accurate self-calibrating time base, ESD protection and more, the main feature of the UART 1-Wire® click, is that it manages all the sensitive signal timings involved in 1-Wire® communication, allowing rapid development of UART to 1-Wire® applications.

click Product page

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Click library

• Author : MikroE Team
• Date : Jun 2020.
• Type : UART type

Software Support

We provide a library for the UART1Wire 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 form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for UART1Wire Click driver.

Standard key functions :

• Config Object Initialization function.

void uart1wire_cfg_setup ( uart1wire_cfg_t *cfg );

• Initialization function.

UART1WIRE_RETVAL uart1wire_init ( uart1wire_t *ctx, uart1wire_cfg_t *cfg );

Example key functions :

• This function sends an 8-bit command to the click module.

void uart1wire_write_command ( uart1wire_t *ctx, uint8_t cmd );

• This function reads the temperature from DALLAS one wire temperature sensors.

int8_t uart1wire_read_temperature ( uart1wire_t *ctx, float *temperature, uint8_t resolution );

• This function sends a reset pulse signal.

void uart1wire_reset ( uart1wire_t *ctx );

Examples Description

This example reads and processes data from UART 1-Wire clicks.

The demo application is composed of two sections :

Application Init

Initializes the driver and logger.

void application_init ( void )
{
    log_cfg_t log_cfg;
    uart1wire_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    uart1wire_cfg_setup( &cfg );
    UART1WIRE_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    uart1wire_init( &uart1wire, &cfg );
    
    Delay_ms( 100 );
}
  

Application Task

Reads the temperature data from DALLAS temperature sensors and logs the results on the USB UART every second.

void application_task ( void )
{
    float temp_f;
    uint8_t res_flag;
    
    res_flag = uart1wire_read_temperature ( &uart1wire, &temp_f, UART1WIRE_TEMP_SENSOR_RESOLUTION_9BIT );
    if ( res_flag == UART1WIRE_OK )
    {
        log_printf( &logger, " * Temperature:     %.2f C\r\n", temp_f );
        log_printf( &logger, "------------------------------\r\n" );
        Delay_ms( 1000 );
    }
} 

Note

Connect only DQ and GND pins to the UART 1-Wire click connector.

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.UART1Wire

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.

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