Library Description

The library contains functions for starting, writing data to I2C wires and reading data from I2C wires.

Key functions:

• void i2cllc_start() - The function executes start condition on I2C wires.

• void i2cllc_write(uint8_t slaveAddress, uint8_t *pBuf, uint16_t nBytes, uint8_t endMode) - The function should execute write sequence on I2C wires.

• void i2cllc_read(uint8_t slaveAddress, uint8_t *pBuf, uint16_t nBytes, uint8_t endMode) - The function should execute read sequence on I2C wires.

Examples description

The application is composed of the three sections :

• System Initialization - Initializes I2C module
• Application Initialization - Initialization driver init
• Application Task - (code snippet) - Reads the temperature from the Thermo 7 click board and logs data to UART.

Note: The start configuration chip is required at the beginning of each program so that the chip wakes up and prepares for operation and measurement. What is included and set in the start-up function can be viewed in the help file.

void applicationTask()
{
    // Thermo 7 measurement Temperature
    uint8_t writeReg[ 1 ];
    uint8_t readReg[ 2 ] = {0};
    
    float Temp_msb;
    uint8_t Temp_lsb;
    char  tempText[ 50 ];

    writeReg[ 0 ] = 0x00;
    i2cllc_start();
    i2cllc_write( 0x48, &writeReg[0], 1, _I2CLLC_END_MODE_RESTART );
    i2cllc_read( 0x48, &readReg[0], 2, _I2CLLC_END_MODE_STOP );
    
    Temp_msb = readReg[ 0 ];
    Temp_lsb = readReg[ 1 ] & 0xF0;

    if( temp_lsb & 0x80 ) Temp_msb += 0.50;
    if( temp_lsb & 0x40 ) Temp_msb += 0.25;
    if( temp_lsb & 0x20 ) Temp_msb += 0.125;
    if( temp_lsb & 0x10 ) Temp_msb += 0.0625;

    FloatToStr(Temp_msb, tempText);
    mikrobus_logWrite(" Ambient temperature : ", _LOG_TEXT );
    mikrobus_logWrite(tempText, _LOG_TEXT);
    mikrobus_logWrite(" C", _LOG_LINE);
    Delay_ms( 1000 );
}

Other mikroE Libraries used in the example:

I2C

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.