Library Description

The library covers all the necessary functions to control I2C to SPI click board. A library performs interface between a standard I2C-bus of a microcontroller and an SPI bus.

Key functions:

• void i2ctospi_spiWriteByte( uint8_t slaveDevice, uint8_t functionId, uint8_t regAddr, uint8_t writeData ) - Generic SPI writes the byte of data to data buffer function.
• uint8_t i2ctospi_spiReadByte( uint8_t slaveDevice, uint8_t functionId, uint8_t regAddr ) - Generic SPI read the byte of data from data buffer function.
• void i2ctospi_configSPI( uint8_t configData ) - Configure SPI Interface function.

Examples description

The application is composed of the three sections :

• System Initialization - Initializes GPIO, SPI and LOG structures, sets RST and CS pins as output and INT pin as an input.
• Application Initialization - Initialization driver enable's - I2C, hardware reset, SS0 ( CS ) configured to be used as slave select outputs, set the configuration of SPI: order MSB first, clock Idle low, leading-edge transition, SPI clock rate to 115kHz, set SPI EEPROM write enable SS0, clear  interrupt, clear RT5 register, sets starting time: hours, minutes and seconds ( enable counting ), also write log.
• Application Task - This is an example which demonstrates the use of RTC 5 click is wired to I2C to SPI click board. I2C to SPI click communicates with register via the I2C interface, serve as an interface between a standard I2C-bus of a microcontroller and an SPI bus. RTC 5 click communicates with register via SPI interface. In this examples, we display RTC time which we received reading from the target register address of MCP79510 chip on RTC 5 click board via I2C interface of I2C to SPI click board. Results are being sent to the Usart Terminal where you can track their changes. All data logs write on usb uart changes for every 1 sec.

void applicationTask()
{
    timeSeconds = _rtc5GetTimeSeconds();
    Delay_1ms();
    timeMinutes = _rtc5GetTimeMinutes();
    Delay_1ms();
    timeHours = _rtc5GetTimeHours();
    Delay_1ms();

    if ( timeSecondsNew != timeSeconds )
    {
        mikrobus_logWrite( " Time :  ", _LOG_TEXT );

        _displayLogUart( timeHours );
        mikrobus_logWrite( ":", _LOG_TEXT );

        _displayLogUart( timeMinutes );
        mikrobus_logWrite( ":", _LOG_TEXT );

        _displayLogUart( timeSeconds );
        mikrobus_logWrite( "", _LOG_LINE );
 
        mikrobus_logWrite( "------------------", _LOG_LINE );

        timeSecondsNew = timeSeconds;
    }

    Delay_1ms();
}

Additional Functions :

• void _displayLogUart( uint8_t value ) - Write the value of time or date as a two-digit number.
• void _rtc5Clear() - Clear RTCC and SRAM memory of RTC 5 click.
• void _rtc5SetTimeSeconds( uint8_t seconds ) - Set the seconds and enable counting.
• uint8_t _rtc5GetTimeSeconds() - Get the seconds.
• void _rtc5SetTimeMinutes( uint8_t minutes ) - Set the minutes.
• uint8_t _rtc5GetTimeMinutes() - Get the minutes.
• void _rtc5SetTimeHours( uint8_t hours ) - Set the hours.
• uint8_t _rtc5GetTimeHours() - Get the hours.

Other mikroE Libraries used in the example:

• I2C
• UART
• Conversions

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.