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Author: MIKROE
Last Updated: 2024-10-31
Package Version: 2.1.0.10
mikroSDK Library: 2.0.0.0
Category: Sub-1 GHz Transceivers
Downloaded: 171 times
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License: MIT license
ISM RX 3 Click is a compact add-on board that contains a Sub-GHz RF receiver. This board features the MAX41470, a high-performance, low-power receiver ideal for amplitude shift-keyed (ASK) and frequency shift-keyed (FSK) data from Maxim Integrated, now part of Analog Devices.
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ISM RX 3 Click is a compact add-on board that contains a Sub-GHz RF receiver. This board features the MAX41470, a high-performance, low-power receiver ideal for amplitude shift-keyed (ASK) and frequency shift-keyed (FSK) data from Maxim Integrated, now part of Analog Devices.
We provide a library for the ISMRX3 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on mikroE github account.
This library contains API for ISMRX3 Click driver.
ismrx3_cfg_setup
Config Object Initialization function.
void ismrx3_cfg_setup ( ismrx3_cfg_t *cfg );
ismrx3_init
Initialization function.
err_t ismrx3_init ( ismrx3_t *ctx, ismrx3_cfg_t *cfg );
ismrx3_default_cfg
Click Default Configuration function.
err_t ismrx3_default_cfg ( ismrx3_t *ctx );
ismrx3_reset
Reset function.
void ismrx3_reset( ismrx3_t *ctx );
ismrx3_get_data
Read data output.
uint8_t ismrx3_get_data( ismrx3_t *ctx );
ismrx3_get_clk
Read clock output.
uint8_t ismrx3_get_clk( ismrx3_t *ctx );
This example showcases ability of Click board to configure and read incoming rf signal and parses data using data and clock line.
The demo application is composed of two sections :
Initialization of communication modules (SPI, UART), and additional communication pins. Resets device, reads device ID, and sets default configuration that sets ASK modulation and 433.92MHz with 5bps data rate.
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
ismrx3_cfg_t ismrx3_cfg; /**< Click config object. */
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
ismrx3_cfg_setup( &ismrx3_cfg );
ISMRX3_MAP_MIKROBUS( ismrx3_cfg, MIKROBUS_1 );
err_t init_flag = ismrx3_init( &ismrx3, &ismrx3_cfg );
if ( init_flag == SPI_MASTER_ERROR )
{
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
ismrx3_reset( &ismrx3 );
uint8_t read_data;
ismrx3_generic_read( &ismrx3, 0x1E, &read_data );
log_info( &logger, " > ID: 0x%.2X", ( uint16_t )read_data );
Delay_ms ( 500 );
ismrx3.modulation = ISMRX3_MODULATION_ASK;
ismrx3.reference_freq = ISMRX3_FREQUENCY_MHZ_433p92;
ismrx3.data_rate = ISMRX3_DATA_RATE_KBPS_5;
ismrx3.freq_deviation = ISMRX3_DEVIATION_KHZ_40;
if ( ISMRX3_ERROR == ismrx3_default_cfg ( &ismrx3 ) )
{
log_error( &logger, " Configuration Error. " );
log_info( &logger, " Please, change device configuration parameters and run program again... " );
for ( ; ; );
}
manchester_counter = 0;
log_info( &logger, " Application Task " );
}
Reads clock pin and gets samples of data pin state, converts it in manchester data that stores in buffer. When it fills out manchester buffer checks if expected preamble data is received. If it is checks the next byte(it should be received data length). Then parses rest of data and if it's correct shows it on log.
void application_task ( void )
{
if ( ismrx3_get_clk( &ismrx3 ) )
{
sample = ismrx3_get_data( &ismrx3 );
if ( last_sample == sample )
{
consecutive++;
}
else
{
if ( consecutive < 4 )//Single sample
{
manchester_buf[ manchester_counter++ ] = last_sample + 48;//Convert to ascii 1/0
}
else if ( consecutive < 6 )//Two samples
{
manchester_buf[ manchester_counter++ ] = last_sample + 48;//Convert to ascii 1/0
manchester_buf[ manchester_counter++ ] = last_sample + 48;//Convert to ascii 1/0
}
consecutive = 1;
last_sample = sample;
}
while ( ismrx3_get_clk( &ismrx3 ) );
}
if ( manchester_counter >= MANCHESTER_BUF_LEN - 1 )
{
parse_samples( );
manchester_counter = 0;
}
}
- The expected data that is received is:
_PREAMBLEWORD(2bytes), _DATALENGTH(1byte), DATA(1..255bytes)
- By default _PREAMBLEWORD is set to be 0xAAAA.
The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on mikroE github account.
Other mikroE Libraries used in the example:
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.