Library Description

Library contains functions for getting temperature and humidity. Library contains functions for getting and setting user register. Library contains functions for changing resolution and soft reset. Library contains functions for enabling/disabling heater and OTP.

Key functions:

• T_RERAM_RETVAL reram_send_cmd( uint8_t cmd_code ) - This function allows user to send a desired command.
• T_RERAM_RETVAL reram_read_mem( uint32_t memAddr, uint8_t *dataOut, uint16_t nBytes ) - This command allows user to read RAM.
• T_RERAM_RETVAL reram_write_mem( uint32_t memAddr, uint8_t *dataIn, uint16_t nBytes ) - This command allows user to write RAM.

Examples description

The application is composed of three sections :

• System Initialization - Initializes peripherals and pins.
• Application Initialization - Initializes SPI serial interface and puts a device to the initial state. The device now is ready to receive command from user.
• Application Task - (code snippet) - Executes a device commands depending on the entered string commands by user. The user can perform a complete control of the ReRAM by using this driver and demo example, which includes all possible commands:
  • wren - enable Status and RAM writing command (Write Enable Latch is set),
  • wrdi - disable Status and RAM writing command (Write Enable Latch is reset),
  • rdsr - read Status register command (shows status messages),
  • wrsr - write Status register command (also executes Status Write Protection),
  • read - read ReRAM array command (depending on the entered parameters, shows error messages),
  • write - write ReRAM array command (depending on the entered parameters, shows error messages),
  • rdid - read device ID command,
  • sleep - puts a device to sleep state,
  • wakeup - wakes up a device. All possible parameters for each command can be entered from user side. When user wants to execute a 'write' or 'wrsr' command, the Write Enable will be automatically enabled.

Note : Write Enable Latch is reset after the following operations: After 'wrdi' command recognition. The end of writing process after 'wrsr' command recognition. The end of writing process after 'write' command recognition.

   Data will not be written in the protected blocks of the ReRAM array.
   Upper 1/4 goes from address 0x60000 to 0x7FFFF.
   Upper 1/2 goes from address 0x40000 to 0x7FFFF.
   The entire ReRAM array goes from address 0x00000 to 0x7FFFF.

void applicationTask()
{
    process();
}

Additional Functions :

• _pow - Power math function.
• _strcmp - Allows user to compare two strings, does two strings match or not.
• _str_to_dec - Allows user to enter a determined number of digits and converts these digits from ASCII format to decimal value.
• process - Allows user to enter a string command and executes a command processing.

Other Mikroe Libraries used in the example:

• Conversions
• C_String
• SPI
• UART

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.