Library description
Initializes SPI bus driver and click driver functions witch set DAC analog output voltage to the desired value, but in the inverted value compared to the reference voltage, VREF (VDD). Functions have the ability to set the device in the active or shutdown mode or to enable or disable internal pull up on the VIN. For more details check the documentation.

Key functions
void mcp16331inv_setDACVout( uint16_t DAC_value, uint8_t gain_value, uint8_t mode ) - The function determines DAC output voltage value in depending on the input DAC_value (0x0000 - 0x0FFF) and gain_value. The function also can put the device in the active or the shutdown mode.
void mcp16331inv_enableVin( uint8_t state ) - The function enables or disables internal VIN pull up.

The application is composed of three sections :

• System Initialization - Initializes pins, directions, and SPI bus.
• Application Initialization - Initializes the click driver and enables the pull-up.
• Application Task - (code snippet) - Sets DAC output voltage to 3500mV when the gain is set up on 1xVREF, with 4s delay time, and then sets DAC output voltage to 5000mV, when the gain is now set up on 2x VREF, with 4s delay time. The VIN voltage must be greater than 4V.

void applicationTask()
{
    mcp16331inv_setDACVout( MCP16331INV_3500_MV_1X_GAIN, 
        MCP16331INV_GAIN_X_VREF, MCP16331INV_ACTIVE_MODE );
    Delay_ms( 4000 );
    mcp16331inv_setDACVout( MCP16331INV_5000_MV_2X_GAIN, 
        MCP16331INV_GAIN_2X_VREF, MCP16331INV_ACTIVE_MODE );
    Delay_ms( 4000 );
}

Other MikroElektronika Libraries used in the example:

• SPI

Additional notes and information 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.