Library Description

Library initializes and defines I2C driver and performs communication with device registers, reading and writting. Library also performs temperature measurement and converts 16-bit temperature data to the celsius value. Library has the ability to perform EEPROM programming, and data which is written to the EEPROM will be saved after power down. After reset command data in EEPROM will be updated to the device registers. For more details check documentation.

Key functions

uint8_t templog2_writeReg( uint8_t register_address, uint16_t transfer_data )- Function writes 16-bit data to register.

uint8_t templog2_readReg( uint8_t register_address, uint16_t *dataOut )- Function reads 16-bit data from register.

uint8_t templog2_readTemp( float *tempOut, uint8_t *tempSign )- Function gets 16-bit temperature data, converts value to celsius unit and returns temperature limit status.

uint8_t templog2_setMode( uint8_t opMode, uint8_t alertMode )- Function sets device in desired operation mode and alert mode, which determines how temperature limit status be set.

Example description

The application is composed of three sections :

• System Initialization - Initializes peripherals and pins.
• Application Initialization - Initializes I2C driver and performs device configuration. Sets temperature limit, high limit to 25 Celsius and low limit to 0 Celsius. Sets total active conversion time to 250 ms and 8 average samples. Also sets Shutdown Mode as default mode, and after device reset puts device in Continuous Conversion Mode. High limit status will be set when temperature cross over the determined high limit temperature value. Low limit status will be set when temperature falls below the determined low limit temperature value.
• Application Task - (code snippet) - Logs temperature value in celsius unit on USBUART and also logs message when high limit or low limit temperature is detected.

void applicationTask()
{
 checkLimit = templog2_readTemp( &temperature, &temperatureSign );
 FloatToStr( temperature, text );
 mikrobus_logWrite( "Temperature is: ", _LOG_TEXT );

 if (temperatureSign == 0)
 {
 mikrobus_logWrite( "-", _LOG_TEXT );
 }
 mikrobus_logWrite( text, _LOG_TEXT );
 mikrobus_logWrite( " Celsius", _LOG_LINE );

 if (checkLimit == 2)
 {
 mikrobus_logWrite( "High temperature limit detection!", _LOG_LINE );
 }
 if (checkLimit == 1)
 {
 mikrobus_logWrite( "Low temperature limit detection!", _LOG_LINE );
 }
 mikrobus_logWrite( "", _LOG_LINE );
}

Other mikroE Libraries used in the example:

• Conversions
• I2C
• UART

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.