MIKROE-2568

  SPIRIT click PID: MIKROE-2568 SPIRIT click carries the SP1ML 868MHz ultra low-power RF module. The board is designed to use 3.3V power supply and 3.3V or 5V I/O voltage levels. It communicates with the target MCU over UART interface, with additional functionality provided by the following pins on the mikroBUS™ line: PWM, RST, CS. It can be used to wirelessly send and receive UART data. SP1ML 868MHz RF module features SP1ML is based on the SPIRIT1 RF sub-GHz transceiver (with integrated SMPS), STM32L1 microcontroller, integrated filter/balun, and chip antenna. There are two operational modes, command mode and operating mode. The command mode allows module configuration and status interrogation using an extended ‘AT’ style command set. In operating mode the module serves its primary purpose as a wireless transceiver. In operating mode the module uses only 13.5mA, 2.2mA in command mode, and even lower in stanby with just 1.4µA. This kind of power consumption makes it ideal for smart devices that send small amounts of data. The module has an integrated antenna and crystal. Key features    SP1ML 868MHz RF module   o Low data rate, low power sub‐GHz transceiver  o STM32L1 Ultra low power microcontroller at 32 MHz (16 kB RAM and 128 kB Flash)  o Integrated antenna and crystal  o Output power up to +11.6 dBm  UART interface  3.3V power supply    Specification Product Type RF Sub 1GHz Security systems, mobile health and medicine applications, IoT, wireless Applications metering, etc. MCU SP1ML 868MHz ultra low-power RF module MCU Memory 16 kB RAM and 128 kB Flash Key Features Low data rate, low power sub-GHz transceiver Interface UART Power Supply 3.3V Compatibility mikroBUS Click board M (42.9 x 25.4 mm) size  Pinout diagram This table shows how the pinout on SPIRIT click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes    Pin  Pin  Notes  mikroBUStm  Not connected  NC  1  AN  Reset input, active low  RST  2  RST  PWM 16 SHDN Shutdown  INT  15 NC  Not connected  Command mode  CMD  3  CS  TX  14 TXD UART transmit data Not connected  NC  4  SCK  RX  13 RXD UART receive data  Not connected  NC  5  MISO  SCL 12 NC  Not connected  Not connected  NC  6  MOSI  SDA 11 NC  Not connected  Power supply  +3.3V  7  3.3V  5V  10 +5V Power supply  Ground  GND  8  GND  GND 9 GND Ground  Jumpers and settings LOGIC SEL ‐ used to select 3.3 or 5V logical level for UART communication (J1A in the schematic).   Programming Code examples for SPIRIT click, written for MikroElektronika hardware and compilers are available on Libstock. General description The library implements communication protocol between the MCU host and SPIRIT click module. It can work in two modes, command mode and operating mode. The command mode allows module configuration and status interrogation using an extended ‘AT’ style command set. In operating mode the module serves its primary purpose as a wireless transceiver. It uses asynchronous approach to issue commands and receive responses via callback functions. Code snippet The code snippet shows an example callback function for the ATO command. It checks if the response is OK to change from library state to operating mode. 01 static bool on_ato(char* response) 02 { 03 if(strcmp(response, "OK") == 0) 04 { 05 LOG_INFO("Entered operating mode."); 06 07 spirit_mode(SPIRIT_OPERATING_MODE); 08 } 09 else 10 { 11 LOG_ERROR("Failed to enter to operation mode..."); 12 } 13 14 return true; 15 } Features     Configurable command buffer size.  Ring buffer for receiving data via UART  Supported mikroC compilers for ARM, PIC32, PIC, FT90.  Asynchronous command issuing.                                     https://shop.mikroe.com/click/wireless‐connectivity/spirit 4/5/17