adc

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ADC click

ADC Click carries the MCP3204 12-bit Analog-to-Digital converter. The click is designed to run on 3.3V by default. Place PWR SEL SMD jumper to 5V position if used with 5V systems.

click Product page

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Click library

• Author : Nemanja Medakovic
• Date : Nov 2019.
• Type : SPI type

Software Support

We provide a library for the Adc 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 Adc Click driver.

Standard key functions :

• Configuration Object Setup function.

void adc_cfg_setup( adc_cfg_t *cfg );

• Click Initialization function.

adc_err_t adc_init( adc_t *ctx, adc_cfg_t *cfg );

Example key functions :

• Get Single-Ended Channel function.

uint16_t adc_get_single_ended_ch( adc_t *ctx, adc_ch_t channel );

• Get Pseudo-Differential Pair function.

uint16_t adc_get_differential_ch( adc_t *ctx, adc_ch_t channel );

Examples Description

This example demonstrates the use of ADC Click board. The all channels can be configured as single-ended or pseudo-differential pair.

The demo application is composed of two sections :

Application Init

Initializes SPI driver, performs the reference voltage selection and initializes UART console for results logging.

void application_init( void )
{
    log_cfg_t log_cfg;
    adc_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.

    adc_cfg_setup( &cfg );
    ADC_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    adc_init( &adc, &cfg );
}

Application Task

Reads voltage level of channels 0 and 1 in the both configurations, single-ended and pseudo-differential pair, every 1 second. All channels results will be calculated to millivolts [mV].

void application_task( void )
{
    adc_get_single_ended_ch( &adc, ADC_CH0_OR_CH01 );
    adc_get_single_ended_ch( &adc, ADC_CH1_OR_CH10 );
    adc_get_single_ended_ch( &adc, ADC_CH2_OR_CH23 );
    adc_get_single_ended_ch( &adc, ADC_CH3_OR_CH32 );
    adc_get_differential_ch( &adc, ADC_CH0_OR_CH01 );

    log_printf( &logger, "* CH0 = %u mV\r\n", adc.ch0 );
    log_printf( &logger, "* CH1 = %u mV\r\n", adc.ch1 );
    log_printf( &logger, "* CH2 = %u mV\r\n", adc.ch2 );
    log_printf( &logger, "* CH3 = %u mV\r\n", adc.ch3 );
    log_printf( &logger, "* CH0 - CH1 = %d mV\r\n", adc.ch01 );
    log_printf( &logger, "-----------------------------\r\n" );

    Delay_ms( 1000 );
}

Note

In single-ended mode the all channels must be in the range from Vss (GND) to Vref (3V3 by default). In pseudo-differential mode the IN- channel must be in the range from (Vss - 100mV) to (Vss + 100mV). The IN+ channel must be in the range from IN- to (Vref + IN-). If any of conditions are not fullfilled, the device will return 0 or Vref voltage level, and measurements are not valid.

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.Adc

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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