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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: 155 times
Not followed.
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.