DIGI POT 14 Click is a compact add-on board that contains a digitally controlled potentiometer. This board features the TPL0102, a dual-channel digital potentiometer with non-volatile memory from Texas Instruments. It is a 100K resistance end-to-end potentiometer with a 256-position resolution, where the wiper position can be stored in EEPROM. It can operate from both 3.3V and 5V power supplies and provides a typical 92ppm/ºC end-to-end nominal resistance temperature coefficient and only 4ppm/ºC ratiometric.
- Author : Stefan Ilic
- Date : Aug 2023.
- Type : I2C type
We provide a library for the DIGI POT 14 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.
This library contains API for DIGI POT 14 Click driver.
digipot14_cfg_setup
Config Object Initialization function.
void digipot14_cfg_setup ( digipot14_cfg_t *cfg );
digipot14_init
Initialization function.
err_t digipot14_init ( digipot14_t *ctx, digipot14_cfg_t *cfg );
digipot14_default_cfg
Click Default Configuration function.
err_t digipot14_default_cfg ( digipot14_t *ctx );
digipot14_reg_write
DIGI POT 14 register write function.
err_t digipot14_reg_write ( digipot14_t *ctx, uint8_t reg, uint8_t data_in );
digipot14_set_pot_a_wiper
DIGI POT 14 set the wiper position of potentiometer A function.
err_t digipot14_set_pot_a_wiper ( digipot14_t *ctx, uint8_t wiper_pos );
digipot14_set_pot_b_wiper
DIGI POT 14 set the wiper position of potentiometer B function.
err_t digipot14_set_pot_b_wiper ( digipot14_t *ctx, uint8_t wiper_pos );
This library contains API for DIGI POT 14 Click driver. The demo application uses a digital potentiometer to change the resistance values.
The demo application is composed of two sections :
The initialization of I2C module, log UART, and additional pins. After the driver init, the app executes a default configuration.
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
digipot14_cfg_t digipot14_cfg; /**< Click config object. */
/**
* 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.
digipot14_cfg_setup( &digipot14_cfg );
DIGIPOT14_MAP_MIKROBUS( digipot14_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == digipot14_init( &digipot14, &digipot14_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
if ( DIGIPOT14_ERROR == digipot14_default_cfg ( &digipot14 ) )
{
log_error( &logger, " Default configuration." );
for ( ; ; );
}
log_info( &logger, " Application Task " );
}
This example demonstrates the use of the DIGI POT 14 Click board™. The demo application iterates through the entire wiper range. Results are being sent to the UART Terminal, where you can track their changes.
void application_task ( void )
{
for ( uint8_t wiper_val = DIGIPOT14_MIN_POSITION; wiper_val <= DIGIPOT14_MAX_POSITION; wiper_val++ )
{
digipot14_set_pot_a_wiper( &digipot14, wiper_val );
digipot14_set_pot_b_wiper( &digipot14, wiper_val );
log_printf( &logger, " Resistance = %.3f KOhm \r\n",
( DIGIPOT14_MAX_RESISTANCE_KOHM * ( wiper_val / DIGIPOT14_MAX_POSITION_NUM ) ) );
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.DIGIPOT14
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.