Library Description

Initializes and defines the GPIO click driver and functions witch turn on or turn off the LED.

Key functions:

• void ibutton_enableGreenLed(uint8_t state) - The function enables or disables a green LED on click (RST pin) depending on the state of the parameter value.
• void ibutton_enableRedLed(uint8_t state) - The function enables or disables a red LED on the Click board (CS pin) depending the on the state of the parameter valuer.

Example description

The application is composed of three sections:

• System Initialization -  Initializes the peripherals and pins.
• Application Initialization - Initializes the Click board driver.
• Application Task - Realizes communication between the ibutton and buffer (EEPROM) which includes reading, writing and comparing values.

void applicationTask()
{
 uint8_t check_flag;

 if(!Ow_Reset(OW_PORT, OW_PIN))
 {
 check_flag = Read_Key();
 if(check_flag = 0)
 {
 mikrobus_logWrite("Key exist", _LOG_LINE);
 Delay_ms(500);
 }else
 {
 mikrobus_logWrite("Key doesn't exist", _LOG_LINE);
 Delay_ms(500);
 }
 }
 else
 {
 mikrobus_logWrite("Add new key", _LOG_LINE);

 Delay_ms(500);

 while(Ow_Reset(OW_PORT, OW_PIN))
 {
 if(check_state == 0)
 {
 mikrobus_logWrite("Insert iButton", _LOG_LINE);
 Delay_ms(500);
 check_state = 1;
 }
 }

 check_flag = Add_key();

 if(check_flag == 0)
 {
 mikrobus_logWrite("Key added", _LOG_LINE);
 Delay_ms(500);
 }else
 {
 mikrobus_logWrite("Key already exist", _LOG_LINE);
 Delay_ms(500);
 }

 mikrobus_logWrite("Read iButton", _LOG_LINE);

 check_state = 0;
 }

 Delay_ms(100);
}

• uint8_t Check_ibutton(uint8_t *ibutton_data) - Compares ibutton data values with buffer data values.
• uint8_t Check_CRC(uint8_t *ibutton)
• void Do_something(void) - Enables red LED on click and disables green LED on click.
• void Do_something_else(void) - Enables green LED on the Click board and disables red LED on click.
• uint8_t Add_key() - Writes ibutton data to buffer data in first free location.
• uint8_t * Read_from_EEPROM(uint8_t key_num, uint8_t *buffer_data) - Reads data from the buffer (EEPROM).
• uint8_t Read_Key() - Reads ibutton data, compares this data with buffer data and depending on the comparison calls other functions to do something.
• uint8_t Get_Free_Location(uint8_t *buffer_data) - Returns the value of the first free buffer location.
• void Write_to_EEPROM(uint8_t key_num, uint8_t *buffer_data, uint8_t *ibutton_data) - Writes data to buffer (EEPROM).
• uint8_t *Get_data() - Realizes One wire communication.

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.