Library Description

Initializes and defines UART bus driver, and defines driver's functions for comunication (reading and writing) between tRF clicks.

Key functions:

• void trf_writeByte(uint8_t input) - Function writes (sends) one byte in UART rx buffer

• uint8_t trf_readByte() - Function reads (receives) one byte from UART rx buffer

• uint8_t trf_byteReady() - Function checks state of rx buffer (is new data placed in)

• void trf_reset() - Function resets click and sets back in normal operating mode

Example description

The application is composed of three sections:

• System Initialization - Intializes UART module
• Application Initialization - Driver intialization
• Application Task - (code snippet) - Checks if new data byte have received in rx buffer (ready for reading), and if ready than reads one byte from rx buffer. In second case aplication task writes message data via UART.

void applicationTask()
{
 char tmp;
 uint8_t rdyFlag;

// RECEIVER - UART polling 

 rdyFlag = trf_byteReady();

 if (1 == rdyFlag)
 {
 tmp = trf_readByte();
 mikrobus_logWrite( &tmp, _LOG_BYTE );
 }

// TRANSMITER - TX each 2 sec

 /*for (tmp = 0; tmp < 9; tmp++)
 {
 trf_writeByte( MESSAGE_DATA[tmp] );
 mikrobus_logWrite( "MESSAGE SENT", _LOG_LINE );
 Delay_100ms();
 }
 Delay_ms(2000);*/
}

Other mikroE Libraries used in the example:

• Conversions
• 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.