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Author: MIKROE
Last Updated: 2024-10-31
Package Version: 2.1.0.12
mikroSDK Library: 2.0.0.0
Category: I2C
Downloaded: 189 times
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License: MIT license
I2C MUX 7 Click is a compact add-on board representing a bidirectional selector dedicated to applications with I2C slave address conflicts. This board features the PI4MSD5V9547, an octal bidirectional translating multiplexer controlled by the I2C-bus from Texas Instruments. Only one SCL/SDA channel can be selected at a time, determined by the contents of the programmable control register. The board powers up with Channel 0 connected, allowing immediate communication between the Master and downstream devices on that channel.
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I2C MUX 7 Click is a compact add-on board representing a bidirectional selector dedicated to applications with I2C slave address conflicts. This board features the PI4MSD5V9547, an octal bidirectional translating multiplexer controlled by the I2C-bus from Texas Instruments. Only one SCL/SDA channel can be selected at a time, determined by the contents of the programmable control register. The board powers up with Channel 0 connected, allowing immediate communication between the Master and downstream devices on that channel.
We provide a library for the I2C MUX 7 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 I2C MUX 7 Click driver.
i2cmux7_cfg_setup
Config Object Initialization function.
void i2cmux7_cfg_setup ( i2cmux7_cfg_t *cfg );
i2cmux7_init
Initialization function.
err_t i2cmux7_init ( i2cmux7_t *ctx, i2cmux7_cfg_t *cfg );
i2cmux7_default_cfg
Click Default Configuration function.
err_t i2cmux7_default_cfg ( i2cmux7_t *ctx );
i2cmux7_set_channel
This function sets the desired channel active and configures its slave address.
err_t i2cmux7_set_channel ( i2cmux7_t *ctx, uint8_t ch_sel, uint8_t ch_slave_addr );
i2cmux7_read_channel
This function reads the currently selected channel value.
err_t i2cmux7_read_channel ( i2cmux7_t *ctx, uint8_t *ch_sel );
i2cmux7_generic_read
This function reads a desired number of data bytes starting from the selected register by using I2C serial interface.
err_t i2cmux7_generic_read ( i2cmux7_t *ctx, uint8_t reg, uint8_t *rx_buf, uint8_t rx_len );
This example demonstrates the use of I2C MUX 7 Click board by reading the device ID of a 6DOF IMU 11 and Compass 3 Click boards connected to the channels 0 and 7 respectfully.
The demo application is composed of two sections :
Initializes the driver and resets the device.
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
i2cmux7_cfg_t i2cmux7_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.
i2cmux7_cfg_setup( &i2cmux7_cfg );
I2CMUX7_MAP_MIKROBUS( i2cmux7_cfg, MIKROBUS_1 );
if ( I2C_MASTER_ERROR == i2cmux7_init( &i2cmux7, &i2cmux7_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
i2cmux7_reset_device ( &i2cmux7 );
log_info( &logger, " Application Task " );
}
Reads the device ID of the connected Click boards. Channel 0 : 6DOF IMU 11 Click [slave address: 0x0E; reg: 0x00; id: 0x2D], Channel 7 : Compass 3 Click [slave address: 0x30; reg: 0x2F; id: 0x0C]. All data is being logged on the USB UART where you can check the device ID.
void application_task ( void )
{
uint8_t channel, device_id;
if ( I2CMUX7_OK == i2cmux7_set_channel ( &i2cmux7, DEVICE0_POSITION, DEVICE0_SLAVE_ADDRESS ) )
{
if ( I2CMUX7_OK == i2cmux7_read_channel ( &i2cmux7, &channel ) )
{
log_printf( &logger, " --- Channel %u --- \r\n", ( uint16_t ) ( channel & I2CMUX7_CHANNEL_NUM_MASK ) );
}
if ( I2CMUX7_OK == i2cmux7_generic_read ( &i2cmux7, DEVICE0_REG_ID, &device_id, 1 ) )
{
log_printf( &logger, " %s - Device ID: 0x%.2X \r\n\n", ( char * ) DEVICE0_NAME, ( uint16_t ) device_id );
}
Delay_ms ( 1000 );
}
if ( I2CMUX7_OK == i2cmux7_set_channel ( &i2cmux7, DEVICE1_POSITION, DEVICE1_SLAVE_ADDRESS ) )
{
if ( I2CMUX7_OK == i2cmux7_read_channel ( &i2cmux7, &channel ) )
{
log_printf( &logger, " --- Channel %u --- \r\n", ( uint16_t ) ( channel & I2CMUX7_CHANNEL_NUM_MASK ) );
}
if ( I2CMUX7_OK == i2cmux7_generic_read ( &i2cmux7, DEVICE1_REG_ID, &device_id, 1 ) )
{
log_printf( &logger, " %s - Device ID: 0x%.2X \r\n\n", ( char * ) DEVICE1_NAME, ( uint16_t ) device_id );
}
Delay_ms ( 1000 );
}
}
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. UART terminal is available in all MikroElektronika compilers.
VREG click is a digitally controlled DC Voltage regulator in mikroBUS form factor. The design is based on the well-known LM317 circuit, with the addition of a 12-bit DAC, 12-bit ADC, and an Operational Amplifier. Two pairs of screw terminals serve as inputs and outputs.
[Learn More]Ozone 3 Click is a compact add-on board suitable for ozone concentration detection and monitoring. This board features the 110-407, a high-performance ultra-thin electrochemical gas sensor from SPEC Sensors supported by the LMP91000, a high-precision integrated analog front-end IC (AFE) ideal for this sensing application. It provides the reference voltage required by the sensor and offers a choice between the analog output from the AFE IC buffered with the low noise Op-Amp and digital output from the 12-bit SAR A/D converter. This Click board™ represents an ideal choice for health, environmental, industrial, and residential monitoring.
[Learn More]RS232 SPI Click is based around the MAX3100, a universal asynchronous receiver transmitter (UART) - the first UART specifically optimized for small microcontroller-based systems, from Maxim Integrated. Because of the features contained in its modules, the RS232 SPI Click can be used for handheld instruments, small networks in HVAC or Building control, UART in SPI systems, battery-powered systems, PDAs, notebooks and many more.
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